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All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* $FreeBSD: src/sys/netinet6/ipsec.c,v 1.3.2.7 2001/07/19 06:37:23 kris Exp $ */ /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * IPsec controller part. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/mcache.h> #include <sys/domain.h> #include <sys/protosw.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/errno.h> #include <sys/time.h> #include <sys/kernel.h> #include <sys/syslog.h> #include <sys/sysctl.h> #include <sys/priv.h> #include <kern/locks.h> #include <sys/kauth.h> #include <sys/bitstring.h> #include <libkern/OSAtomic.h> #include <libkern/sysctl.h> #include <net/if.h> #include <net/route.h> #include <net/if_ipsec.h> #include <net/if_ports_used.h> #include <netinet/in.h> #include <netinet/in_systm.h> #include <netinet/ip.h> #include <netinet/ip_var.h> #include <netinet/in_var.h> #include <netinet/udp.h> #include <netinet/udp_var.h> #include <netinet/ip_ecn.h> #include <netinet6/ip6_ecn.h> #include <netinet/tcp.h> #include <netinet/udp.h> #include <netinet/ip6.h> #include <netinet6/ip6_var.h> #include <netinet/in_pcb.h> #include <netinet/icmp6.h> #include <netinet6/ipsec.h> #include <netinet6/ipsec6.h> #include <netinet6/ah.h> #include <netinet6/ah6.h> #if IPSEC_ESP #include <netinet6/esp.h> #include <netinet6/esp6.h> #endif #include <netkey/key.h> #include <netkey/keydb.h> #include <netkey/key_debug.h> #include <net/net_osdep.h> #include <IOKit/pwr_mgt/IOPM.h> #include <os/log_private.h> #if IPSEC_DEBUG int ipsec_debug = 1; #else int ipsec_debug = 0; #endif #include <sys/kdebug.h> #define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIPSEC, 1) #define DBG_LAYER_END NETDBG_CODE(DBG_NETIPSEC, 3) #define DBG_FNC_GETPOL_SOCK NETDBG_CODE(DBG_NETIPSEC, (1 << 8)) #define DBG_FNC_GETPOL_ADDR NETDBG_CODE(DBG_NETIPSEC, (2 << 8)) #define DBG_FNC_IPSEC_OUT NETDBG_CODE(DBG_NETIPSEC, (3 << 8)) extern lck_mtx_t *sadb_mutex; struct ipsecstat ipsecstat; int ip4_ah_cleartos = 1; int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; int ip4_esp_net_deflev = IPSEC_LEVEL_USE; int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; int ip4_ah_net_deflev = IPSEC_LEVEL_USE; struct secpolicy ip4_def_policy; int ip4_ipsec_ecn = ECN_COMPATIBILITY; /* ECN ignore(-1)/compatibility(0)/normal(1) */ int ip4_esp_randpad = -1; int esp_udp_encap_port = 0; static int sysctl_def_policy SYSCTL_HANDLER_ARGS; extern int natt_keepalive_interval; extern u_int64_t natt_now; struct ipsec_tag; void *sleep_wake_handle = NULL; bool ipsec_save_wake_pkt = false; SYSCTL_DECL(_net_inet_ipsec); SYSCTL_DECL(_net_inet6_ipsec6); /* net.inet.ipsec */ SYSCTL_STRUCT(_net_inet_ipsec, IPSECCTL_STATS, stats, CTLFLAG_RD | CTLFLAG_LOCKED, &ipsecstat, ipsecstat, ""); SYSCTL_PROC(_net_inet_ipsec, IPSECCTL_DEF_POLICY, def_policy, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_def_policy.policy, 0, &sysctl_def_policy, "I", ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_esp_trans_deflev, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_esp_net_deflev, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_ah_trans_deflev, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_ah_net_deflev, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, ah_cleartos, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_ah_cleartos, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, ah_offsetmask, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_ah_offsetmask, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, dfbit, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_ipsec_dfbit, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, ecn, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_ipsec_ecn, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, debug, CTLFLAG_RW | CTLFLAG_LOCKED, &ipsec_debug, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, esp_randpad, CTLFLAG_RW | CTLFLAG_LOCKED, &ip4_esp_randpad, 0, ""); /* for performance, we bypass ipsec until a security policy is set */ int ipsec_bypass = 1; SYSCTL_INT(_net_inet_ipsec, OID_AUTO, bypass, CTLFLAG_RD | CTLFLAG_LOCKED, &ipsec_bypass, 0, ""); /* * NAT Traversal requires a UDP port for encapsulation, * esp_udp_encap_port controls which port is used. Racoon * must set this port to the port racoon is using locally * for nat traversal. */ SYSCTL_INT(_net_inet_ipsec, OID_AUTO, esp_port, CTLFLAG_RW | CTLFLAG_LOCKED, &esp_udp_encap_port, 0, ""); struct ipsecstat ipsec6stat; int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; int ip6_esp_net_deflev = IPSEC_LEVEL_USE; int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; int ip6_ah_net_deflev = IPSEC_LEVEL_USE; struct secpolicy ip6_def_policy; int ip6_ipsec_ecn = ECN_COMPATIBILITY; /* ECN ignore(-1)/compatibility(0)/normal(1) */ int ip6_esp_randpad = -1; /* net.inet6.ipsec6 */ SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD | CTLFLAG_LOCKED, &ipsec6stat, ipsecstat, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, def_policy, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_def_policy.policy, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_esp_trans_deflev, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_esp_net_deflev, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_ah_trans_deflev, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_ah_net_deflev, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, ecn, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_ipsec_ecn, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, debug, CTLFLAG_RW | CTLFLAG_LOCKED, &ipsec_debug, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, esp_randpad, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_esp_randpad, 0, ""); SYSCTL_DECL(_net_link_generic_system); struct ipsec_wake_pkt_info ipsec_wake_pkt; static int ipsec_setspidx_interface(struct secpolicyindex *, u_int8_t, struct mbuf *, int, int, int); static int ipsec_setspidx_mbuf(struct secpolicyindex *, u_int8_t, u_int, struct mbuf *, int); static int ipsec4_setspidx_inpcb(struct mbuf *, struct inpcb *pcb); static int ipsec6_setspidx_in6pcb(struct mbuf *, struct in6pcb *pcb); static int ipsec_setspidx(struct mbuf *, struct secpolicyindex *, int, int); static void ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *, int); static int ipsec4_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); static void ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *, int); static int ipsec6_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); static struct inpcbpolicy *ipsec_newpcbpolicy(void); static void ipsec_delpcbpolicy(struct inpcbpolicy *); static struct secpolicy *ipsec_deepcopy_policy(struct secpolicy *src); static int ipsec_set_policy(struct secpolicy **pcb_sp, int optname, caddr_t request, size_t len, int priv); static void vshiftl(unsigned char *, int, size_t); static int ipsec_in_reject(struct secpolicy *, struct mbuf *); static int ipsec64_encapsulate(struct mbuf *, struct secasvar *); static int ipsec6_update_routecache_and_output(struct ipsec_output_state *state, struct secasvar *sav); static int ipsec46_encapsulate(struct ipsec_output_state *state, struct secasvar *sav); static struct ipsec_tag *ipsec_addaux(struct mbuf *); static struct ipsec_tag *ipsec_findaux(struct mbuf *); static void ipsec_optaux(struct mbuf *, struct ipsec_tag *); int ipsec_send_natt_keepalive(struct secasvar *sav); bool ipsec_fill_offload_frame(ifnet_t ifp, struct secasvar *sav, struct ifnet_keepalive_offload_frame *frame, size_t frame_data_offset); extern bool IOPMCopySleepWakeUUIDKey(char *, size_t); typedef IOReturn (*IOServiceInterestHandler)( void * target, void * refCon, UInt32 messageType, void * provider, void * messageArgument, vm_size_t argSize ); extern void *registerSleepWakeInterest(IOServiceInterestHandler, void *, void *); static int sysctl_def_policy SYSCTL_HANDLER_ARGS { int new_policy = ip4_def_policy.policy; int error = sysctl_handle_int(oidp, &new_policy, 0, req); #pragma unused(arg1, arg2) if (error == 0) { if (new_policy != IPSEC_POLICY_NONE && new_policy != IPSEC_POLICY_DISCARD) { return EINVAL; } ip4_def_policy.policy = new_policy; /* Turn off the bypass if the default security policy changes */ if (ipsec_bypass != 0 && ip4_def_policy.policy != IPSEC_POLICY_NONE) { ipsec_bypass = 0; } } return error; } /* * For OUTBOUND packet having a socket. Searching SPD for packet, * and return a pointer to SP. * OUT: NULL: no apropreate SP found, the following value is set to error. * 0 : bypass * EACCES : discard packet. * ENOENT : ipsec_acquire() in progress, maybe. * others : error occurred. * others: a pointer to SP * * NOTE: IPv6 mapped adddress concern is implemented here. */ struct secpolicy * ipsec4_getpolicybysock(struct mbuf *m, u_int8_t dir, struct socket *so, int *error) { struct inpcbpolicy *pcbsp = NULL; struct secpolicy *currsp = NULL; /* policy on socket */ struct secpolicy *kernsp = NULL; /* policy on kernel */ LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ if (m == NULL || so == NULL || error == NULL) { panic("ipsec4_getpolicybysock: NULL pointer was passed.\n"); } if (so->so_pcb == NULL) { printf("ipsec4_getpolicybysock: so->so_pcb == NULL\n"); return ipsec4_getpolicybyaddr(m, dir, 0, error); } switch (SOCK_DOM(so)) { case PF_INET: pcbsp = sotoinpcb(so)->inp_sp; break; case PF_INET6: pcbsp = sotoin6pcb(so)->in6p_sp; break; } if (!pcbsp) { /* Socket has not specified an IPSEC policy */ return ipsec4_getpolicybyaddr(m, dir, 0, error); } KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_START, 0, 0, 0, 0, 0); switch (SOCK_DOM(so)) { case PF_INET: /* set spidx in pcb */ *error = ipsec4_setspidx_inpcb(m, sotoinpcb(so)); break; case PF_INET6: /* set spidx in pcb */ *error = ipsec6_setspidx_in6pcb(m, sotoin6pcb(so)); break; default: panic("ipsec4_getpolicybysock: unsupported address family\n"); } if (*error) { KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 1, *error, 0, 0, 0); return NULL; } /* sanity check */ if (pcbsp == NULL) { panic("ipsec4_getpolicybysock: pcbsp is NULL.\n"); } switch (dir) { case IPSEC_DIR_INBOUND: currsp = pcbsp->sp_in; break; case IPSEC_DIR_OUTBOUND: currsp = pcbsp->sp_out; break; default: panic("ipsec4_getpolicybysock: illegal direction.\n"); } /* sanity check */ if (currsp == NULL) { panic("ipsec4_getpolicybysock: currsp is NULL.\n"); } /* when privilieged socket */ if (pcbsp->priv) { switch (currsp->policy) { case IPSEC_POLICY_BYPASS: lck_mtx_lock(sadb_mutex); currsp->refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 2, *error, 0, 0, 0); return currsp; case IPSEC_POLICY_ENTRUST: /* look for a policy in SPD */ kernsp = key_allocsp(&currsp->spidx, dir); /* SP found */ if (kernsp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_getpolicybysock called " "to allocate SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(kernsp))); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 3, *error, 0, 0, 0); return kernsp; } /* no SP found */ lck_mtx_lock(sadb_mutex); if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD && ip4_def_policy.policy != IPSEC_POLICY_NONE) { ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", ip4_def_policy.policy, IPSEC_POLICY_NONE)); ip4_def_policy.policy = IPSEC_POLICY_NONE; } ip4_def_policy.refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 4, *error, 0, 0, 0); return &ip4_def_policy; case IPSEC_POLICY_IPSEC: lck_mtx_lock(sadb_mutex); currsp->refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 5, *error, 0, 0, 0); return currsp; default: ipseclog((LOG_ERR, "ipsec4_getpolicybysock: " "Invalid policy for PCB %d\n", currsp->policy)); *error = EINVAL; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 6, *error, 0, 0, 0); return NULL; } /* NOTREACHED */ } /* when non-privilieged socket */ /* look for a policy in SPD */ kernsp = key_allocsp(&currsp->spidx, dir); /* SP found */ if (kernsp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_getpolicybysock called " "to allocate SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(kernsp))); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 7, *error, 0, 0, 0); return kernsp; } /* no SP found */ switch (currsp->policy) { case IPSEC_POLICY_BYPASS: ipseclog((LOG_ERR, "ipsec4_getpolicybysock: " "Illegal policy for non-priviliged defined %d\n", currsp->policy)); *error = EINVAL; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 8, *error, 0, 0, 0); return NULL; case IPSEC_POLICY_ENTRUST: lck_mtx_lock(sadb_mutex); if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD && ip4_def_policy.policy != IPSEC_POLICY_NONE) { ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", ip4_def_policy.policy, IPSEC_POLICY_NONE)); ip4_def_policy.policy = IPSEC_POLICY_NONE; } ip4_def_policy.refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 9, *error, 0, 0, 0); return &ip4_def_policy; case IPSEC_POLICY_IPSEC: lck_mtx_lock(sadb_mutex); currsp->refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 10, *error, 0, 0, 0); return currsp; default: ipseclog((LOG_ERR, "ipsec4_getpolicybysock: " "Invalid policy for PCB %d\n", currsp->policy)); *error = EINVAL; KERNEL_DEBUG(DBG_FNC_GETPOL_SOCK | DBG_FUNC_END, 11, *error, 0, 0, 0); return NULL; } /* NOTREACHED */ } /* * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, * and return a pointer to SP. * OUT: positive: a pointer to the entry for security policy leaf matched. * NULL: no apropreate SP found, the following value is set to error. * 0 : bypass * EACCES : discard packet. * ENOENT : ipsec_acquire() in progress, maybe. * others : error occurred. */ struct secpolicy * ipsec4_getpolicybyaddr(struct mbuf *m, u_int8_t dir, int flag, int *error) { struct secpolicy *sp = NULL; if (ipsec_bypass != 0) { return 0; } LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ if (m == NULL || error == NULL) { panic("ipsec4_getpolicybyaddr: NULL pointer was passed.\n"); } { struct secpolicyindex spidx; KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_START, 0, 0, 0, 0, 0); bzero(&spidx, sizeof(spidx)); /* make a index to look for a policy */ *error = ipsec_setspidx_mbuf(&spidx, dir, AF_INET, m, (flag & IP_FORWARDING) ? 0 : 1); if (*error != 0) { KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_END, 1, *error, 0, 0, 0); return NULL; } sp = key_allocsp(&spidx, dir); } /* SP found */ if (sp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_getpolicybyaddr called " "to allocate SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(sp))); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_END, 2, *error, 0, 0, 0); return sp; } /* no SP found */ lck_mtx_lock(sadb_mutex); if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD && ip4_def_policy.policy != IPSEC_POLICY_NONE) { ipseclog((LOG_INFO, "fixed system default policy:%d->%d\n", ip4_def_policy.policy, IPSEC_POLICY_NONE)); ip4_def_policy.policy = IPSEC_POLICY_NONE; } ip4_def_policy.refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_END, 3, *error, 0, 0, 0); return &ip4_def_policy; } /* Match with bound interface rather than src addr. * Unlike getpolicybyaddr, do not set the default policy. * Return 0 if should continue processing, or -1 if packet * should be dropped. */ int ipsec4_getpolicybyinterface(struct mbuf *m, u_int8_t dir, int *flags, struct ip_out_args *ipoa, struct secpolicy **sp) { struct secpolicyindex spidx; int error = 0; if (ipsec_bypass != 0) { return 0; } /* Sanity check */ if (m == NULL || ipoa == NULL || sp == NULL) { panic("ipsec4_getpolicybyinterface: NULL pointer was passed.\n"); } if (ipoa->ipoa_boundif == IFSCOPE_NONE) { return 0; } KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_START, 0, 0, 0, 0, 0); bzero(&spidx, sizeof(spidx)); /* make a index to look for a policy */ error = ipsec_setspidx_interface(&spidx, dir, m, (*flags & IP_FORWARDING) ? 0 : 1, ipoa->ipoa_boundif, 4); if (error != 0) { KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_END, 1, error, 0, 0, 0); return 0; } *sp = key_allocsp(&spidx, dir); /* Return SP, whether NULL or not */ if (*sp != NULL && (*sp)->policy == IPSEC_POLICY_IPSEC) { if ((*sp)->ipsec_if == NULL) { /* Invalid to capture on an interface without redirect */ key_freesp(*sp, KEY_SADB_UNLOCKED); *sp = NULL; return -1; } else if ((*sp)->disabled) { /* Disabled policies go in the clear */ key_freesp(*sp, KEY_SADB_UNLOCKED); *sp = NULL; *flags |= IP_NOIPSEC; /* Avoid later IPsec check */ } else { /* If policy is enabled, redirect to ipsec interface */ ipoa->ipoa_boundif = (*sp)->ipsec_if->if_index; } } KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_END, 2, error, 0, 0, 0); return 0; } /* * For OUTBOUND packet having a socket. Searching SPD for packet, * and return a pointer to SP. * OUT: NULL: no apropreate SP found, the following value is set to error. * 0 : bypass * EACCES : discard packet. * ENOENT : ipsec_acquire() in progress, maybe. * others : error occurred. * others: a pointer to SP */ struct secpolicy * ipsec6_getpolicybysock(struct mbuf *m, u_int8_t dir, struct socket *so, int *error) { struct inpcbpolicy *pcbsp = NULL; struct secpolicy *currsp = NULL; /* policy on socket */ struct secpolicy *kernsp = NULL; /* policy on kernel */ LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ if (m == NULL || so == NULL || error == NULL) { panic("ipsec6_getpolicybysock: NULL pointer was passed.\n"); } #if DIAGNOSTIC if (SOCK_DOM(so) != PF_INET6) { panic("ipsec6_getpolicybysock: socket domain != inet6\n"); } #endif pcbsp = sotoin6pcb(so)->in6p_sp; if (!pcbsp) { return ipsec6_getpolicybyaddr(m, dir, 0, error); } /* set spidx in pcb */ ipsec6_setspidx_in6pcb(m, sotoin6pcb(so)); /* sanity check */ if (pcbsp == NULL) { panic("ipsec6_getpolicybysock: pcbsp is NULL.\n"); } switch (dir) { case IPSEC_DIR_INBOUND: currsp = pcbsp->sp_in; break; case IPSEC_DIR_OUTBOUND: currsp = pcbsp->sp_out; break; default: panic("ipsec6_getpolicybysock: illegal direction.\n"); } /* sanity check */ if (currsp == NULL) { panic("ipsec6_getpolicybysock: currsp is NULL.\n"); } /* when privilieged socket */ if (pcbsp->priv) { switch (currsp->policy) { case IPSEC_POLICY_BYPASS: lck_mtx_lock(sadb_mutex); currsp->refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; return currsp; case IPSEC_POLICY_ENTRUST: /* look for a policy in SPD */ kernsp = key_allocsp(&currsp->spidx, dir); /* SP found */ if (kernsp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_getpolicybysock called " "to allocate SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(kernsp))); *error = 0; return kernsp; } /* no SP found */ lck_mtx_lock(sadb_mutex); if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD && ip6_def_policy.policy != IPSEC_POLICY_NONE) { ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", ip6_def_policy.policy, IPSEC_POLICY_NONE)); ip6_def_policy.policy = IPSEC_POLICY_NONE; } ip6_def_policy.refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; return &ip6_def_policy; case IPSEC_POLICY_IPSEC: lck_mtx_lock(sadb_mutex); currsp->refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; return currsp; default: ipseclog((LOG_ERR, "ipsec6_getpolicybysock: " "Invalid policy for PCB %d\n", currsp->policy)); *error = EINVAL; return NULL; } /* NOTREACHED */ } /* when non-privilieged socket */ /* look for a policy in SPD */ kernsp = key_allocsp(&currsp->spidx, dir); /* SP found */ if (kernsp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_getpolicybysock called " "to allocate SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(kernsp))); *error = 0; return kernsp; } /* no SP found */ switch (currsp->policy) { case IPSEC_POLICY_BYPASS: ipseclog((LOG_ERR, "ipsec6_getpolicybysock: " "Illegal policy for non-priviliged defined %d\n", currsp->policy)); *error = EINVAL; return NULL; case IPSEC_POLICY_ENTRUST: lck_mtx_lock(sadb_mutex); if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD && ip6_def_policy.policy != IPSEC_POLICY_NONE) { ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", ip6_def_policy.policy, IPSEC_POLICY_NONE)); ip6_def_policy.policy = IPSEC_POLICY_NONE; } ip6_def_policy.refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; return &ip6_def_policy; case IPSEC_POLICY_IPSEC: lck_mtx_lock(sadb_mutex); currsp->refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; return currsp; default: ipseclog((LOG_ERR, "ipsec6_policybysock: Invalid policy for PCB %d\n", currsp->policy)); *error = EINVAL; return NULL; } /* NOTREACHED */ } /* * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, * and return a pointer to SP. * `flag' means that packet is to be forwarded whether or not. * flag = 1: forwad * OUT: positive: a pointer to the entry for security policy leaf matched. * NULL: no apropreate SP found, the following value is set to error. * 0 : bypass * EACCES : discard packet. * ENOENT : ipsec_acquire() in progress, maybe. * others : error occurred. */ #ifndef IP_FORWARDING #define IP_FORWARDING 1 #endif struct secpolicy * ipsec6_getpolicybyaddr(struct mbuf *m, u_int8_t dir, int flag, int *error) { struct secpolicy *sp = NULL; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ if (m == NULL || error == NULL) { panic("ipsec6_getpolicybyaddr: NULL pointer was passed.\n"); } { struct secpolicyindex spidx; bzero(&spidx, sizeof(spidx)); /* make a index to look for a policy */ *error = ipsec_setspidx_mbuf(&spidx, dir, AF_INET6, m, (flag & IP_FORWARDING) ? 0 : 1); if (*error != 0) { return NULL; } sp = key_allocsp(&spidx, dir); } /* SP found */ if (sp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_getpolicybyaddr called " "to allocate SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(sp))); *error = 0; return sp; } /* no SP found */ lck_mtx_lock(sadb_mutex); if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD && ip6_def_policy.policy != IPSEC_POLICY_NONE) { ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", ip6_def_policy.policy, IPSEC_POLICY_NONE)); ip6_def_policy.policy = IPSEC_POLICY_NONE; } ip6_def_policy.refcnt++; lck_mtx_unlock(sadb_mutex); *error = 0; return &ip6_def_policy; } /* Match with bound interface rather than src addr. * Unlike getpolicybyaddr, do not set the default policy. * Return 0 if should continue processing, or -1 if packet * should be dropped. */ int ipsec6_getpolicybyinterface(struct mbuf *m, u_int8_t dir, int flag, struct ip6_out_args *ip6oap, int *noipsec, struct secpolicy **sp) { struct secpolicyindex spidx; int error = 0; if (ipsec_bypass != 0) { return 0; } /* Sanity check */ if (m == NULL || sp == NULL || noipsec == NULL || ip6oap == NULL) { panic("ipsec6_getpolicybyinterface: NULL pointer was passed.\n"); } *noipsec = 0; if (ip6oap->ip6oa_boundif == IFSCOPE_NONE) { return 0; } KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_START, 0, 0, 0, 0, 0); bzero(&spidx, sizeof(spidx)); /* make a index to look for a policy */ error = ipsec_setspidx_interface(&spidx, dir, m, (flag & IP_FORWARDING) ? 0 : 1, ip6oap->ip6oa_boundif, 6); if (error != 0) { KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_END, 1, error, 0, 0, 0); return 0; } *sp = key_allocsp(&spidx, dir); /* Return SP, whether NULL or not */ if (*sp != NULL && (*sp)->policy == IPSEC_POLICY_IPSEC) { if ((*sp)->ipsec_if == NULL) { /* Invalid to capture on an interface without redirect */ key_freesp(*sp, KEY_SADB_UNLOCKED); *sp = NULL; return -1; } else if ((*sp)->disabled) { /* Disabled policies go in the clear */ key_freesp(*sp, KEY_SADB_UNLOCKED); *sp = NULL; *noipsec = 1; /* Avoid later IPsec check */ } else { /* If policy is enabled, redirect to ipsec interface */ ip6oap->ip6oa_boundif = (*sp)->ipsec_if->if_index; } } KERNEL_DEBUG(DBG_FNC_GETPOL_ADDR | DBG_FUNC_END, 2, *error, 0, 0, 0); return 0; } /* * set IP address into spidx from mbuf. * When Forwarding packet and ICMP echo reply, this function is used. * * IN: get the followings from mbuf. * protocol family, src, dst, next protocol * OUT: * 0: success. * other: failure, and set errno. */ static int ipsec_setspidx_mbuf( struct secpolicyindex *spidx, u_int8_t dir, __unused u_int family, struct mbuf *m, int needport) { int error; /* sanity check */ if (spidx == NULL || m == NULL) { panic("ipsec_setspidx_mbuf: NULL pointer was passed.\n"); } bzero(spidx, sizeof(*spidx)); error = ipsec_setspidx(m, spidx, needport, 0); if (error) { goto bad; } spidx->dir = dir; return 0; bad: /* XXX initialize */ bzero(spidx, sizeof(*spidx)); return EINVAL; } static int ipsec_setspidx_interface( struct secpolicyindex *spidx, u_int8_t dir, struct mbuf *m, int needport, int ifindex, int ip_version) { int error; /* sanity check */ if (spidx == NULL || m == NULL) { panic("ipsec_setspidx_interface: NULL pointer was passed.\n"); } bzero(spidx, sizeof(*spidx)); error = ipsec_setspidx(m, spidx, needport, ip_version); if (error) { goto bad; } spidx->dir = dir; if (ifindex != 0) { ifnet_head_lock_shared(); spidx->internal_if = ifindex2ifnet[ifindex]; ifnet_head_done(); } else { spidx->internal_if = NULL; } return 0; bad: return EINVAL; } static int ipsec4_setspidx_inpcb(struct mbuf *m, struct inpcb *pcb) { struct secpolicyindex *spidx; int error; if (ipsec_bypass != 0) { return 0; } /* sanity check */ if (pcb == NULL) { panic("ipsec4_setspidx_inpcb: no PCB found.\n"); } if (pcb->inp_sp == NULL) { panic("ipsec4_setspidx_inpcb: no inp_sp found.\n"); } if (pcb->inp_sp->sp_out == NULL || pcb->inp_sp->sp_in == NULL) { panic("ipsec4_setspidx_inpcb: no sp_in/out found.\n"); } bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx)); bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx)); spidx = &pcb->inp_sp->sp_in->spidx; error = ipsec_setspidx(m, spidx, 1, 0); if (error) { goto bad; } spidx->dir = IPSEC_DIR_INBOUND; spidx = &pcb->inp_sp->sp_out->spidx; error = ipsec_setspidx(m, spidx, 1, 0); if (error) { goto bad; } spidx->dir = IPSEC_DIR_OUTBOUND; return 0; bad: bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx)); bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx)); return error; } static int ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb) { struct secpolicyindex *spidx; int error; /* sanity check */ if (pcb == NULL) { panic("ipsec6_setspidx_in6pcb: no PCB found.\n"); } if (pcb->in6p_sp == NULL) { panic("ipsec6_setspidx_in6pcb: no in6p_sp found.\n"); } if (pcb->in6p_sp->sp_out == NULL || pcb->in6p_sp->sp_in == NULL) { panic("ipsec6_setspidx_in6pcb: no sp_in/out found.\n"); } bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); spidx = &pcb->in6p_sp->sp_in->spidx; error = ipsec_setspidx(m, spidx, 1, 0); if (error) { goto bad; } spidx->dir = IPSEC_DIR_INBOUND; spidx = &pcb->in6p_sp->sp_out->spidx; error = ipsec_setspidx(m, spidx, 1, 0); if (error) { goto bad; } spidx->dir = IPSEC_DIR_OUTBOUND; return 0; bad: bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); return error; } /* * configure security policy index (src/dst/proto/sport/dport) * by looking at the content of mbuf. * the caller is responsible for error recovery (like clearing up spidx). */ static int ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport, int force_ip_version) { struct ip *ip = NULL; struct ip ipbuf; u_int v; struct mbuf *n; int len; int error; if (m == NULL) { panic("ipsec_setspidx: m == 0 passed.\n"); } /* * validate m->m_pkthdr.len. we see incorrect length if we * mistakenly call this function with inconsistent mbuf chain * (like 4.4BSD tcp/udp processing). XXX should we panic here? */ len = 0; for (n = m; n; n = n->m_next) { len += n->m_len; } if (m->m_pkthdr.len != len) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx: " "total of m_len(%d) != pkthdr.len(%d), " "ignored.\n", len, m->m_pkthdr.len)); return EINVAL; } if (m->m_pkthdr.len < sizeof(struct ip)) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx: " "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", m->m_pkthdr.len)); return EINVAL; } if (m->m_len >= sizeof(*ip)) { ip = mtod(m, struct ip *); } else { m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); ip = &ipbuf; } if (force_ip_version) { v = force_ip_version; } else { #ifdef _IP_VHL v = _IP_VHL_V(ip->ip_vhl); #else v = ip->ip_v; #endif } switch (v) { case 4: error = ipsec4_setspidx_ipaddr(m, spidx); if (error) { return error; } ipsec4_get_ulp(m, spidx, needport); return 0; case 6: if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx: " "pkthdr.len(%d) < sizeof(struct ip6_hdr), " "ignored.\n", m->m_pkthdr.len)); return EINVAL; } error = ipsec6_setspidx_ipaddr(m, spidx); if (error) { return error; } ipsec6_get_ulp(m, spidx, needport); return 0; default: KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx: " "unknown IP version %u, ignored.\n", v)); return EINVAL; } } static void ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) { struct ip ip; struct ip6_ext ip6e; u_int8_t nxt; int off; struct tcphdr th; struct udphdr uh; /* sanity check */ if (m == NULL) { panic("ipsec4_get_ulp: NULL pointer was passed.\n"); } if (m->m_pkthdr.len < sizeof(ip)) { panic("ipsec4_get_ulp: too short\n"); } /* set default */ spidx->ul_proto = IPSEC_ULPROTO_ANY; ((struct sockaddr_in *)&spidx->src)->sin_port = IPSEC_PORT_ANY; ((struct sockaddr_in *)&spidx->dst)->sin_port = IPSEC_PORT_ANY; m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); /* ip_input() flips it into host endian XXX need more checking */ if (ip.ip_off & (IP_MF | IP_OFFMASK)) { return; } nxt = ip.ip_p; #ifdef _IP_VHL off = _IP_VHL_HL(ip->ip_vhl) << 2; #else off = ip.ip_hl << 2; #endif while (off < m->m_pkthdr.len) { switch (nxt) { case IPPROTO_TCP: spidx->ul_proto = nxt; if (!needport) { return; } if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) { return; } m_copydata(m, off, sizeof(th), (caddr_t)&th); ((struct sockaddr_in *)&spidx->src)->sin_port = th.th_sport; ((struct sockaddr_in *)&spidx->dst)->sin_port = th.th_dport; return; case IPPROTO_UDP: spidx->ul_proto = nxt; if (!needport) { return; } if (off + sizeof(struct udphdr) > m->m_pkthdr.len) { return; } m_copydata(m, off, sizeof(uh), (caddr_t)&uh); ((struct sockaddr_in *)&spidx->src)->sin_port = uh.uh_sport; ((struct sockaddr_in *)&spidx->dst)->sin_port = uh.uh_dport; return; case IPPROTO_AH: if (off + sizeof(ip6e) > m->m_pkthdr.len) { return; } m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); off += (ip6e.ip6e_len + 2) << 2; nxt = ip6e.ip6e_nxt; break; case IPPROTO_ICMP: default: /* XXX intermediate headers??? */ spidx->ul_proto = nxt; return; } } } /* assumes that m is sane */ static int ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) { struct ip *ip = NULL; struct ip ipbuf; struct sockaddr_in *sin; if (m->m_len >= sizeof(*ip)) { ip = mtod(m, struct ip *); } else { m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); ip = &ipbuf; } sin = (struct sockaddr_in *)&spidx->src; bzero(sin, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(struct sockaddr_in); bcopy(&ip->ip_src, &sin->sin_addr, sizeof(ip->ip_src)); spidx->prefs = sizeof(struct in_addr) << 3; sin = (struct sockaddr_in *)&spidx->dst; bzero(sin, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(struct sockaddr_in); bcopy(&ip->ip_dst, &sin->sin_addr, sizeof(ip->ip_dst)); spidx->prefd = sizeof(struct in_addr) << 3; return 0; } static void ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) { int off, nxt; struct tcphdr th; struct udphdr uh; /* sanity check */ if (m == NULL) { panic("ipsec6_get_ulp: NULL pointer was passed.\n"); } KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); /* set default */ spidx->ul_proto = IPSEC_ULPROTO_ANY; ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; nxt = -1; off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); if (off < 0 || m->m_pkthdr.len < off) { return; } VERIFY(nxt <= UINT8_MAX); switch (nxt) { case IPPROTO_TCP: spidx->ul_proto = (u_int8_t)nxt; if (!needport) { break; } if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) { break; } m_copydata(m, off, sizeof(th), (caddr_t)&th); ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; break; case IPPROTO_UDP: spidx->ul_proto = (u_int8_t)nxt; if (!needport) { break; } if (off + sizeof(struct udphdr) > m->m_pkthdr.len) { break; } m_copydata(m, off, sizeof(uh), (caddr_t)&uh); ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; break; case IPPROTO_ICMPV6: default: /* XXX intermediate headers??? */ spidx->ul_proto = (u_int8_t)nxt; break; } } /* assumes that m is sane */ static int ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) { struct ip6_hdr *ip6 = NULL; struct ip6_hdr ip6buf; struct sockaddr_in6 *sin6; if (m->m_len >= sizeof(*ip6)) { ip6 = mtod(m, struct ip6_hdr *); } else { m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); ip6 = &ip6buf; } sin6 = (struct sockaddr_in6 *)&spidx->src; bzero(sin6, sizeof(*sin6)); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(struct sockaddr_in6); bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { sin6->sin6_addr.s6_addr16[1] = 0; sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); } spidx->prefs = sizeof(struct in6_addr) << 3; sin6 = (struct sockaddr_in6 *)&spidx->dst; bzero(sin6, sizeof(*sin6)); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(struct sockaddr_in6); bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { sin6->sin6_addr.s6_addr16[1] = 0; sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); } spidx->prefd = sizeof(struct in6_addr) << 3; return 0; } static struct inpcbpolicy * ipsec_newpcbpolicy(void) { struct inpcbpolicy *p; p = (struct inpcbpolicy *)_MALLOC(sizeof(*p), M_SECA, M_WAITOK); return p; } static void ipsec_delpcbpolicy(struct inpcbpolicy *p) { FREE(p, M_SECA); } /* initialize policy in PCB */ int ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp) { struct inpcbpolicy *new; /* sanity check. */ if (so == NULL || pcb_sp == NULL) { panic("ipsec_init_policy: NULL pointer was passed.\n"); } new = ipsec_newpcbpolicy(); if (new == NULL) { ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); return ENOBUFS; } bzero(new, sizeof(*new)); #ifdef __APPLE__ if (kauth_cred_issuser(so->so_cred)) #else if (so->so_cred != 0 && !suser(so->so_cred->pc_ucred, NULL)) #endif { new->priv = 1;} else { new->priv = 0; } if ((new->sp_in = key_newsp()) == NULL) { ipsec_delpcbpolicy(new); return ENOBUFS; } new->sp_in->state = IPSEC_SPSTATE_ALIVE; new->sp_in->policy = IPSEC_POLICY_ENTRUST; if ((new->sp_out = key_newsp()) == NULL) { key_freesp(new->sp_in, KEY_SADB_UNLOCKED); ipsec_delpcbpolicy(new); return ENOBUFS; } new->sp_out->state = IPSEC_SPSTATE_ALIVE; new->sp_out->policy = IPSEC_POLICY_ENTRUST; *pcb_sp = new; return 0; } /* copy old ipsec policy into new */ int ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new) { struct secpolicy *sp; if (ipsec_bypass != 0) { return 0; } sp = ipsec_deepcopy_policy(old->sp_in); if (sp) { key_freesp(new->sp_in, KEY_SADB_UNLOCKED); new->sp_in = sp; } else { return ENOBUFS; } sp = ipsec_deepcopy_policy(old->sp_out); if (sp) { key_freesp(new->sp_out, KEY_SADB_UNLOCKED); new->sp_out = sp; } else { return ENOBUFS; } new->priv = old->priv; return 0; } /* deep-copy a policy in PCB */ static struct secpolicy * ipsec_deepcopy_policy(struct secpolicy *src) { struct ipsecrequest *newchain = NULL; struct ipsecrequest *p; struct ipsecrequest **q; struct ipsecrequest *r; struct secpolicy *dst; if (src == NULL) { return NULL; } dst = key_newsp(); if (dst == NULL) { return NULL; } /* * deep-copy IPsec request chain. This is required since struct * ipsecrequest is not reference counted. */ q = &newchain; for (p = src->req; p; p = p->next) { *q = (struct ipsecrequest *)_MALLOC(sizeof(struct ipsecrequest), M_SECA, M_WAITOK | M_ZERO); if (*q == NULL) { goto fail; } (*q)->next = NULL; (*q)->saidx.proto = p->saidx.proto; (*q)->saidx.mode = p->saidx.mode; (*q)->level = p->level; (*q)->saidx.reqid = p->saidx.reqid; bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); (*q)->sp = dst; q = &((*q)->next); } dst->req = newchain; dst->state = src->state; dst->policy = src->policy; /* do not touch the refcnt fields */ return dst; fail: for (p = newchain; p; p = r) { r = p->next; FREE(p, M_SECA); p = NULL; } key_freesp(dst, KEY_SADB_UNLOCKED); return NULL; } /* set policy and ipsec request if present. */ static int ipsec_set_policy(struct secpolicy **pcb_sp, __unused int optname, caddr_t request, size_t len, int priv) { struct sadb_x_policy *xpl; struct secpolicy *newsp = NULL; int error; /* sanity check. */ if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) { return EINVAL; } if (len < sizeof(*xpl)) { return EINVAL; } xpl = (struct sadb_x_policy *)(void *)request; KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_set_policy: passed policy\n"); kdebug_sadb_x_policy((struct sadb_ext *)xpl)); /* check policy type */ /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) { return EINVAL; } /* check privileged socket */ if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { return EACCES; } /* allocation new SP entry */ if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) { return error; } newsp->state = IPSEC_SPSTATE_ALIVE; /* clear old SP and set new SP */ key_freesp(*pcb_sp, KEY_SADB_UNLOCKED); *pcb_sp = newsp; KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_set_policy: new policy\n"); kdebug_secpolicy(newsp)); return 0; } int ipsec4_set_policy(struct inpcb *inp, int optname, caddr_t request, size_t len, int priv) { struct sadb_x_policy *xpl; struct secpolicy **pcb_sp; int error = 0; struct sadb_x_policy xpl_aligned_buf; u_int8_t *xpl_unaligned; /* sanity check. */ if (inp == NULL || request == NULL) { return EINVAL; } if (len < sizeof(*xpl)) { return EINVAL; } xpl = (struct sadb_x_policy *)(void *)request; /* This is a new mbuf allocated by soopt_getm() */ if (IPSEC_IS_P2ALIGNED(xpl)) { xpl_unaligned = NULL; } else { xpl_unaligned = (__typeof__(xpl_unaligned))xpl; memcpy(&xpl_aligned_buf, xpl, sizeof(xpl_aligned_buf)); xpl = (__typeof__(xpl)) & xpl_aligned_buf; } if (inp->inp_sp == NULL) { error = ipsec_init_policy(inp->inp_socket, &inp->inp_sp); if (error) { return error; } } /* select direction */ switch (xpl->sadb_x_policy_dir) { case IPSEC_DIR_INBOUND: pcb_sp = &inp->inp_sp->sp_in; break; case IPSEC_DIR_OUTBOUND: pcb_sp = &inp->inp_sp->sp_out; break; default: ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", xpl->sadb_x_policy_dir)); return EINVAL; } /* turn bypass off */ if (ipsec_bypass != 0) { ipsec_bypass = 0; } return ipsec_set_policy(pcb_sp, optname, request, len, priv); } /* delete policy in PCB */ int ipsec4_delete_pcbpolicy(struct inpcb *inp) { /* sanity check. */ if (inp == NULL) { panic("ipsec4_delete_pcbpolicy: NULL pointer was passed.\n"); } if (inp->inp_sp == NULL) { return 0; } if (inp->inp_sp->sp_in != NULL) { key_freesp(inp->inp_sp->sp_in, KEY_SADB_UNLOCKED); inp->inp_sp->sp_in = NULL; } if (inp->inp_sp->sp_out != NULL) { key_freesp(inp->inp_sp->sp_out, KEY_SADB_UNLOCKED); inp->inp_sp->sp_out = NULL; } ipsec_delpcbpolicy(inp->inp_sp); inp->inp_sp = NULL; return 0; } int ipsec6_set_policy(struct in6pcb *in6p, int optname, caddr_t request, size_t len, int priv) { struct sadb_x_policy *xpl; struct secpolicy **pcb_sp; int error = 0; struct sadb_x_policy xpl_aligned_buf; u_int8_t *xpl_unaligned; /* sanity check. */ if (in6p == NULL || request == NULL) { return EINVAL; } if (len < sizeof(*xpl)) { return EINVAL; } xpl = (struct sadb_x_policy *)(void *)request; /* This is a new mbuf allocated by soopt_getm() */ if (IPSEC_IS_P2ALIGNED(xpl)) { xpl_unaligned = NULL; } else { xpl_unaligned = (__typeof__(xpl_unaligned))xpl; memcpy(&xpl_aligned_buf, xpl, sizeof(xpl_aligned_buf)); xpl = (__typeof__(xpl)) & xpl_aligned_buf; } if (in6p->in6p_sp == NULL) { error = ipsec_init_policy(in6p->inp_socket, &in6p->in6p_sp); if (error) { return error; } } /* select direction */ switch (xpl->sadb_x_policy_dir) { case IPSEC_DIR_INBOUND: pcb_sp = &in6p->in6p_sp->sp_in; break; case IPSEC_DIR_OUTBOUND: pcb_sp = &in6p->in6p_sp->sp_out; break; default: ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", xpl->sadb_x_policy_dir)); return EINVAL; } return ipsec_set_policy(pcb_sp, optname, request, len, priv); } int ipsec6_delete_pcbpolicy(struct in6pcb *in6p) { /* sanity check. */ if (in6p == NULL) { panic("ipsec6_delete_pcbpolicy: NULL pointer was passed.\n"); } if (in6p->in6p_sp == NULL) { return 0; } if (in6p->in6p_sp->sp_in != NULL) { key_freesp(in6p->in6p_sp->sp_in, KEY_SADB_UNLOCKED); in6p->in6p_sp->sp_in = NULL; } if (in6p->in6p_sp->sp_out != NULL) { key_freesp(in6p->in6p_sp->sp_out, KEY_SADB_UNLOCKED); in6p->in6p_sp->sp_out = NULL; } ipsec_delpcbpolicy(in6p->in6p_sp); in6p->in6p_sp = NULL; return 0; } /* * return current level. * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. */ u_int ipsec_get_reqlevel(struct ipsecrequest *isr) { u_int level = 0; u_int esp_trans_deflev = 0, esp_net_deflev = 0, ah_trans_deflev = 0, ah_net_deflev = 0; /* sanity check */ if (isr == NULL || isr->sp == NULL) { panic("ipsec_get_reqlevel: NULL pointer is passed.\n"); } if (((struct sockaddr *)&isr->sp->spidx.src)->sa_family != ((struct sockaddr *)&isr->sp->spidx.dst)->sa_family) { panic("ipsec_get_reqlevel: family mismatched.\n"); } /* XXX note that we have ipseclog() expanded here - code sync issue */ #define IPSEC_CHECK_DEFAULT(lev) \ (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ && (lev) != IPSEC_LEVEL_UNIQUE) \ ? (ipsec_debug \ ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ (lev), IPSEC_LEVEL_REQUIRE) \ : (void)0), \ (lev) = IPSEC_LEVEL_REQUIRE, \ (lev) \ : (lev)) /* set default level */ switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { case AF_INET: esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); break; case AF_INET6: esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); break; default: panic("key_get_reqlevel: Unknown family. %d\n", ((struct sockaddr *)&isr->sp->spidx.src)->sa_family); } #undef IPSEC_CHECK_DEFAULT /* set level */ switch (isr->level) { case IPSEC_LEVEL_DEFAULT: switch (isr->saidx.proto) { case IPPROTO_ESP: if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { level = esp_net_deflev; } else { level = esp_trans_deflev; } break; case IPPROTO_AH: if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { level = ah_net_deflev; } else { level = ah_trans_deflev; } break; case IPPROTO_IPCOMP: ipseclog((LOG_ERR, "ipsec_get_reqlevel: " "still got IPCOMP - exiting\n")); break; default: panic("ipsec_get_reqlevel: " "Illegal protocol defined %u\n", isr->saidx.proto); } break; case IPSEC_LEVEL_USE: case IPSEC_LEVEL_REQUIRE: level = isr->level; break; case IPSEC_LEVEL_UNIQUE: level = IPSEC_LEVEL_REQUIRE; break; default: panic("ipsec_get_reqlevel: Illegal IPsec level %u\n", isr->level); } return level; } /* * Check AH/ESP integrity. * OUT: * 0: valid * 1: invalid */ static int ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) { struct ipsecrequest *isr; u_int level; int need_auth, need_conf, need_icv; KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec_in_reject: using SP\n"); kdebug_secpolicy(sp)); /* check policy */ switch (sp->policy) { case IPSEC_POLICY_DISCARD: case IPSEC_POLICY_GENERATE: return 1; case IPSEC_POLICY_BYPASS: case IPSEC_POLICY_NONE: return 0; case IPSEC_POLICY_IPSEC: break; case IPSEC_POLICY_ENTRUST: default: panic("ipsec_hdrsiz: Invalid policy found. %d\n", sp->policy); } need_auth = 0; need_conf = 0; need_icv = 0; /* XXX should compare policy against ipsec header history */ for (isr = sp->req; isr != NULL; isr = isr->next) { /* get current level */ level = ipsec_get_reqlevel(isr); switch (isr->saidx.proto) { case IPPROTO_ESP: if (level == IPSEC_LEVEL_REQUIRE) { need_conf++; #if 0 /* this won't work with multiple input threads - isr->sav would change * with every packet and is not necessarily related to the current packet * being processed. If ESP processing is required - the esp code should * make sure that the integrity check is present and correct. I don't see * why it would be necessary to check for the presence of the integrity * check value here. I think this is just wrong. * isr->sav has been removed. * %%%%%% this needs to be re-worked at some point but I think the code below can * be ignored for now. */ if (isr->sav != NULL && isr->sav->flags == SADB_X_EXT_NONE && isr->sav->alg_auth != SADB_AALG_NONE) { need_icv++; } #endif } break; case IPPROTO_AH: if (level == IPSEC_LEVEL_REQUIRE) { need_auth++; need_icv++; } break; case IPPROTO_IPCOMP: /* * we don't really care, as IPcomp document says that * we shouldn't compress small packets, IPComp policy * should always be treated as being in "use" level. */ break; } } KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_in_reject: auth:%d conf:%d icv:%d m_flags:%x\n", need_auth, need_conf, need_icv, m->m_flags)); if ((need_conf && !(m->m_flags & M_DECRYPTED)) || (!need_auth && need_icv && !(m->m_flags & M_AUTHIPDGM)) || (need_auth && !(m->m_flags & M_AUTHIPHDR))) { return 1; } return 0; } /* * Check AH/ESP integrity. * This function is called from tcp_input(), udp_input(), * and {ah,esp}4_input for tunnel mode */ int ipsec4_in_reject_so(struct mbuf *m, struct socket *so) { struct secpolicy *sp = NULL; int error; int result; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ if (m == NULL) { return 0; /* XXX should be panic ? */ } /* get SP for this packet. * When we are called from ip_forward(), we call * ipsec4_getpolicybyaddr() with IP_FORWARDING flag. */ if (so == NULL) { sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); } else { sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 0, &error); } if (sp == NULL) { return 0; /* XXX should be panic ? * -> No, there may be error. */ } result = ipsec_in_reject(sp, m); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_in_reject_so call free SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(sp))); key_freesp(sp, KEY_SADB_UNLOCKED); return result; } int ipsec4_in_reject(struct mbuf *m, struct inpcb *inp) { LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); if (inp == NULL) { return ipsec4_in_reject_so(m, NULL); } if (inp->inp_socket) { return ipsec4_in_reject_so(m, inp->inp_socket); } else { panic("ipsec4_in_reject: invalid inpcb/socket"); } /* NOTREACHED */ return 0; } /* * Check AH/ESP integrity. * This function is called from tcp6_input(), udp6_input(), * and {ah,esp}6_input for tunnel mode */ int ipsec6_in_reject_so(struct mbuf *m, struct socket *so) { struct secpolicy *sp = NULL; int error; int result; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ if (m == NULL) { return 0; /* XXX should be panic ? */ } /* get SP for this packet. * When we are called from ip_forward(), we call * ipsec6_getpolicybyaddr() with IP_FORWARDING flag. */ if (so == NULL) { sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); } else { sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 0, &error); } if (sp == NULL) { return 0; /* XXX should be panic ? */ } result = ipsec_in_reject(sp, m); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_in_reject_so call free SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(sp))); key_freesp(sp, KEY_SADB_UNLOCKED); return result; } int ipsec6_in_reject(struct mbuf *m, struct in6pcb *in6p) { LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); if (in6p == NULL) { return ipsec6_in_reject_so(m, NULL); } if (in6p->in6p_socket) { return ipsec6_in_reject_so(m, in6p->in6p_socket); } else { panic("ipsec6_in_reject: invalid in6p/socket"); } /* NOTREACHED */ return 0; } /* * compute the byte size to be occupied by IPsec header. * in case it is tunneled, it includes the size of outer IP header. * NOTE: SP passed is free in this function. */ size_t ipsec_hdrsiz(struct secpolicy *sp) { struct ipsecrequest *isr; size_t siz, clen; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec_hdrsiz: using SP\n"); kdebug_secpolicy(sp)); /* check policy */ switch (sp->policy) { case IPSEC_POLICY_DISCARD: case IPSEC_POLICY_GENERATE: case IPSEC_POLICY_BYPASS: case IPSEC_POLICY_NONE: return 0; case IPSEC_POLICY_IPSEC: break; case IPSEC_POLICY_ENTRUST: default: panic("ipsec_hdrsiz: Invalid policy found. %d\n", sp->policy); } siz = 0; for (isr = sp->req; isr != NULL; isr = isr->next) { clen = 0; switch (isr->saidx.proto) { case IPPROTO_ESP: #if IPSEC_ESP clen = esp_hdrsiz(isr); #else clen = 0; /*XXX*/ #endif break; case IPPROTO_AH: clen = ah_hdrsiz(isr); break; default: ipseclog((LOG_ERR, "ipsec_hdrsiz: " "unknown protocol %u\n", isr->saidx.proto)); break; } if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { switch (((struct sockaddr *)&isr->saidx.dst)->sa_family) { case AF_INET: clen += sizeof(struct ip); break; case AF_INET6: clen += sizeof(struct ip6_hdr); break; default: ipseclog((LOG_ERR, "ipsec_hdrsiz: " "unknown AF %d in IPsec tunnel SA\n", ((struct sockaddr *)&isr->saidx.dst)->sa_family)); break; } } siz += clen; } return siz; } /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ size_t ipsec4_hdrsiz(struct mbuf *m, u_int8_t dir, struct inpcb *inp) { struct secpolicy *sp = NULL; int error; size_t size; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ if (m == NULL) { return 0; /* XXX should be panic ? */ } if (inp != NULL && inp->inp_socket == NULL) { panic("ipsec4_hdrsize: why is socket NULL but there is PCB."); } /* get SP for this packet. * When we are called from ip_forward(), we call * ipsec4_getpolicybyaddr() with IP_FORWARDING flag. */ if (inp == NULL) { sp = ipsec4_getpolicybyaddr(m, dir, IP_FORWARDING, &error); } else { sp = ipsec4_getpolicybyaddr(m, dir, 0, &error); } if (sp == NULL) { return 0; /* XXX should be panic ? */ } size = ipsec_hdrsiz(sp); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_hdrsiz call free SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(sp))); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec4_hdrsiz: size:%lu.\n", (u_int32_t)size)); key_freesp(sp, KEY_SADB_UNLOCKED); return size; } /* This function is called from ipsec6_hdrsize_tcp(), * and maybe from ip6_forward.() */ size_t ipsec6_hdrsiz(struct mbuf *m, u_int8_t dir, struct in6pcb *in6p) { struct secpolicy *sp = NULL; int error; size_t size; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ if (m == NULL) { return 0; /* XXX shoud be panic ? */ } if (in6p != NULL && in6p->in6p_socket == NULL) { panic("ipsec6_hdrsize: why is socket NULL but there is PCB."); } /* get SP for this packet */ /* XXX Is it right to call with IP_FORWARDING. */ if (in6p == NULL) { sp = ipsec6_getpolicybyaddr(m, dir, IP_FORWARDING, &error); } else { sp = ipsec6_getpolicybyaddr(m, dir, 0, &error); } if (sp == NULL) { return 0; } size = ipsec_hdrsiz(sp); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_hdrsiz call free SP:0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(sp))); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec6_hdrsiz: size:%lu.\n", (u_int32_t)size)); key_freesp(sp, KEY_SADB_UNLOCKED); return size; } /* * encapsulate for ipsec tunnel. * ip->ip_src must be fixed later on. */ int ipsec4_encapsulate(struct mbuf *m, struct secasvar *sav) { struct ip *oip; struct ip *ip; size_t plen; u_int32_t hlen; /* can't tunnel between different AFs */ if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family != ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family || ((struct sockaddr *)&sav->sah->saidx.src)->sa_family != AF_INET) { m_freem(m); return EINVAL; } if (m->m_len < sizeof(*ip)) { panic("ipsec4_encapsulate: assumption failed (first mbuf length)"); } ip = mtod(m, struct ip *); #ifdef _IP_VHL hlen = _IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif if (m->m_len != hlen) { panic("ipsec4_encapsulate: assumption failed (first mbuf length)"); } /* generate header checksum */ ip->ip_sum = 0; #ifdef _IP_VHL ip->ip_sum = in_cksum(m, hlen); #else ip->ip_sum = in_cksum(m, hlen); #endif plen = m->m_pkthdr.len; /* * grow the mbuf to accomodate the new IPv4 header. * NOTE: IPv4 options will never be copied. */ if (M_LEADINGSPACE(m->m_next) < hlen) { struct mbuf *n; MGET(n, M_DONTWAIT, MT_DATA); if (!n) { m_freem(m); return ENOBUFS; } n->m_len = hlen; n->m_next = m->m_next; m->m_next = n; m->m_pkthdr.len += hlen; oip = mtod(n, struct ip *); } else { m->m_next->m_len += hlen; m->m_next->m_data -= hlen; m->m_pkthdr.len += hlen; oip = mtod(m->m_next, struct ip *); } ip = mtod(m, struct ip *); ovbcopy((caddr_t)ip, (caddr_t)oip, hlen); m->m_len = sizeof(struct ip); m->m_pkthdr.len -= (hlen - sizeof(struct ip)); /* construct new IPv4 header. see RFC 2401 5.1.2.1 */ /* ECN consideration. */ ip_ecn_ingress(ip4_ipsec_ecn, &ip->ip_tos, &oip->ip_tos); #ifdef _IP_VHL ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2); #else ip->ip_hl = sizeof(struct ip) >> 2; #endif ip->ip_off &= htons(~IP_OFFMASK); ip->ip_off &= htons(~IP_MF); switch (ip4_ipsec_dfbit) { case 0: /* clear DF bit */ ip->ip_off &= htons(~IP_DF); break; case 1: /* set DF bit */ ip->ip_off |= htons(IP_DF); break; default: /* copy DF bit */ break; } ip->ip_p = IPPROTO_IPIP; if (plen + sizeof(struct ip) < IP_MAXPACKET) { ip->ip_len = htons((u_int16_t)(plen + sizeof(struct ip))); } else { ipseclog((LOG_ERR, "IPv4 ipsec: size exceeds limit: " "leave ip_len as is (invalid packet)\n")); } if (rfc6864 && IP_OFF_IS_ATOMIC(ntohs(ip->ip_off))) { ip->ip_id = 0; } else { ip->ip_id = ip_randomid(); } bcopy(&((struct sockaddr_in *)&sav->sah->saidx.src)->sin_addr, &ip->ip_src, sizeof(ip->ip_src)); bcopy(&((struct sockaddr_in *)&sav->sah->saidx.dst)->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)); ip->ip_ttl = IPDEFTTL; /* XXX Should ip_src be updated later ? */ return 0; } int ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) { struct ip6_hdr *oip6; struct ip6_hdr *ip6; size_t plen; /* can't tunnel between different AFs */ if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family != ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family || ((struct sockaddr *)&sav->sah->saidx.src)->sa_family != AF_INET6) { m_freem(m); return EINVAL; } plen = m->m_pkthdr.len; /* * grow the mbuf to accomodate the new IPv6 header. */ if (m->m_len != sizeof(struct ip6_hdr)) { panic("ipsec6_encapsulate: assumption failed (first mbuf length)"); } if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { struct mbuf *n; MGET(n, M_DONTWAIT, MT_DATA); if (!n) { m_freem(m); return ENOBUFS; } n->m_len = sizeof(struct ip6_hdr); n->m_next = m->m_next; m->m_next = n; m->m_pkthdr.len += sizeof(struct ip6_hdr); oip6 = mtod(n, struct ip6_hdr *); } else { m->m_next->m_len += sizeof(struct ip6_hdr); m->m_next->m_data -= sizeof(struct ip6_hdr); m->m_pkthdr.len += sizeof(struct ip6_hdr); oip6 = mtod(m->m_next, struct ip6_hdr *); } ip6 = mtod(m, struct ip6_hdr *); ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); /* Fake link-local scope-class addresses */ if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) { oip6->ip6_src.s6_addr16[1] = 0; } if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) { oip6->ip6_dst.s6_addr16[1] = 0; } /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ /* ECN consideration. */ ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) { ip6->ip6_plen = htons((u_int16_t)plen); } else { /* ip6->ip6_plen will be updated in ip6_output() */ } ip6->ip6_nxt = IPPROTO_IPV6; bcopy(&((struct sockaddr_in6 *)&sav->sah->saidx.src)->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); bcopy(&((struct sockaddr_in6 *)&sav->sah->saidx.dst)->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); ip6->ip6_hlim = IPV6_DEFHLIM; /* XXX Should ip6_src be updated later ? */ return 0; } static int ipsec64_encapsulate(struct mbuf *m, struct secasvar *sav) { struct ip6_hdr *ip6, *ip6i; struct ip *ip; size_t plen; u_int8_t hlim; /* tunneling over IPv4 */ if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family != ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family || ((struct sockaddr *)&sav->sah->saidx.src)->sa_family != AF_INET) { m_freem(m); return EINVAL; } plen = m->m_pkthdr.len; ip6 = mtod(m, struct ip6_hdr *); hlim = ip6->ip6_hlim; /* * grow the mbuf to accomodate the new IPv4 header. */ if (m->m_len != sizeof(struct ip6_hdr)) { panic("ipsec6_encapsulate: assumption failed (first mbuf length)"); } if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { struct mbuf *n; MGET(n, M_DONTWAIT, MT_DATA); if (!n) { m_freem(m); return ENOBUFS; } n->m_len = sizeof(struct ip6_hdr); n->m_next = m->m_next; m->m_next = n; m->m_pkthdr.len += sizeof(struct ip); ip6i = mtod(n, struct ip6_hdr *); } else { m->m_next->m_len += sizeof(struct ip6_hdr); m->m_next->m_data -= sizeof(struct ip6_hdr); m->m_pkthdr.len += sizeof(struct ip); ip6i = mtod(m->m_next, struct ip6_hdr *); } bcopy(ip6, ip6i, sizeof(struct ip6_hdr)); ip = mtod(m, struct ip *); m->m_len = sizeof(struct ip); /* * Fill in some of the IPv4 fields - we don't need all of them * because the rest will be filled in by ip_output */ ip->ip_v = IPVERSION; ip->ip_hl = sizeof(struct ip) >> 2; ip->ip_id = 0; ip->ip_sum = 0; ip->ip_tos = 0; ip->ip_off = 0; ip->ip_ttl = hlim; ip->ip_p = IPPROTO_IPV6; /* construct new IPv4 header. see RFC 2401 5.1.2.1 */ /* ECN consideration. */ ip64_ecn_ingress(ip4_ipsec_ecn, &ip->ip_tos, &ip6->ip6_flow); if (plen + sizeof(struct ip) < IP_MAXPACKET) { ip->ip_len = htons((u_int16_t)(plen + sizeof(struct ip))); } else { ip->ip_len = htons((u_int16_t)plen); ipseclog((LOG_ERR, "IPv4 ipsec: size exceeds limit: " "leave ip_len as is (invalid packet)\n")); } bcopy(&((struct sockaddr_in *)&sav->sah->saidx.src)->sin_addr, &ip->ip_src, sizeof(ip->ip_src)); bcopy(&((struct sockaddr_in *)&sav->sah->saidx.dst)->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)); return 0; } int ipsec6_update_routecache_and_output( struct ipsec_output_state *state, struct secasvar *sav) { struct sockaddr_in6* dst6; struct route_in6 *ro6; struct ip6_hdr *ip6; errno_t error = 0; int plen; struct ip6_out_args ip6oa; struct route_in6 ro6_new; struct flowadv *adv = NULL; if (!state->m) { return EINVAL; } ip6 = mtod(state->m, struct ip6_hdr *); // grab sadb_mutex, before updating sah's route cache lck_mtx_lock(sadb_mutex); ro6 = &sav->sah->sa_route; dst6 = (struct sockaddr_in6 *)(void *)&ro6->ro_dst; if (ro6->ro_rt) { RT_LOCK(ro6->ro_rt); } if (ROUTE_UNUSABLE(ro6) || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst)) { if (ro6->ro_rt != NULL) { RT_UNLOCK(ro6->ro_rt); } ROUTE_RELEASE(ro6); } if (ro6->ro_rt == 0) { bzero(dst6, sizeof(*dst6)); dst6->sin6_family = AF_INET6; dst6->sin6_len = sizeof(*dst6); dst6->sin6_addr = ip6->ip6_dst; rtalloc_scoped((struct route *)ro6, sav->sah->outgoing_if); if (ro6->ro_rt) { RT_LOCK(ro6->ro_rt); } } if (ro6->ro_rt == 0) { ip6stat.ip6s_noroute++; IPSEC_STAT_INCREMENT(ipsec6stat.out_noroute); error = EHOSTUNREACH; // release sadb_mutex, after updating sah's route cache lck_mtx_unlock(sadb_mutex); return error; } /* * adjust state->dst if tunnel endpoint is offlink * * XXX: caching rt_gateway value in the state is * not really good, since it may point elsewhere * when the gateway gets modified to a larger * sockaddr via rt_setgate(). This is currently * addressed by SA_SIZE roundup in that routine. */ if (ro6->ro_rt->rt_flags & RTF_GATEWAY) { dst6 = (struct sockaddr_in6 *)(void *)ro6->ro_rt->rt_gateway; } RT_UNLOCK(ro6->ro_rt); ROUTE_RELEASE(&state->ro); route_copyout((struct route *)&state->ro, (struct route *)ro6, sizeof(struct route_in6)); state->dst = (struct sockaddr *)dst6; state->tunneled = 6; // release sadb_mutex, after updating sah's route cache lck_mtx_unlock(sadb_mutex); state->m = ipsec6_splithdr(state->m); if (!state->m) { IPSEC_STAT_INCREMENT(ipsec6stat.out_nomem); error = ENOMEM; return error; } ip6 = mtod(state->m, struct ip6_hdr *); switch (sav->sah->saidx.proto) { case IPPROTO_ESP: #if IPSEC_ESP error = esp6_output(state->m, &ip6->ip6_nxt, state->m->m_next, sav); #else m_freem(state->m); error = EINVAL; #endif break; case IPPROTO_AH: error = ah6_output(state->m, &ip6->ip6_nxt, state->m->m_next, sav); break; default: ipseclog((LOG_ERR, "%s: unknown ipsec protocol %d\n", __FUNCTION__, sav->sah->saidx.proto)); m_freem(state->m); IPSEC_STAT_INCREMENT(ipsec6stat.out_inval); error = EINVAL; break; } if (error) { // If error, packet already freed by above output routines state->m = NULL; return error; } plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr); if (plen > IPV6_MAXPACKET) { ipseclog((LOG_ERR, "%s: IPsec with IPv6 jumbogram is not supported\n", __FUNCTION__)); IPSEC_STAT_INCREMENT(ipsec6stat.out_inval); error = EINVAL;/*XXX*/ return error; } ip6 = mtod(state->m, struct ip6_hdr *); ip6->ip6_plen = htons((u_int16_t)plen); ipsec_set_pkthdr_for_interface(sav->sah->ipsec_if, state->m, AF_INET6); ipsec_set_ip6oa_for_interface(sav->sah->ipsec_if, &ip6oa); /* Increment statistics */ ifnet_stat_increment_out(sav->sah->ipsec_if, 1, (u_int32_t)mbuf_pkthdr_len(state->m), 0); /* Send to ip6_output */ bzero(&ro6_new, sizeof(ro6_new)); bzero(&ip6oa, sizeof(ip6oa)); ip6oa.ip6oa_flowadv.code = 0; ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR; if (state->outgoing_if) { ip6oa.ip6oa_boundif = state->outgoing_if; ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; } adv = &ip6oa.ip6oa_flowadv; (void) ip6_output(state->m, NULL, &ro6_new, IPV6_OUTARGS, NULL, NULL, &ip6oa); state->m = NULL; if (adv->code == FADV_FLOW_CONTROLLED || adv->code == FADV_SUSPENDED) { error = ENOBUFS; ifnet_disable_output(sav->sah->ipsec_if); return error; } return 0; } int ipsec46_encapsulate(struct ipsec_output_state *state, struct secasvar *sav) { struct mbuf *m; struct ip6_hdr *ip6; struct ip *oip; struct ip *ip; size_t plen; u_int32_t hlen; m = state->m; if (!m) { return EINVAL; } /* can't tunnel between different AFs */ if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family != ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family || ((struct sockaddr *)&sav->sah->saidx.src)->sa_family != AF_INET6) { m_freem(m); return EINVAL; } if (m->m_len < sizeof(*ip)) { panic("ipsec46_encapsulate: assumption failed (first mbuf length)"); return EINVAL; } ip = mtod(m, struct ip *); #ifdef _IP_VHL hlen = _IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif if (m->m_len != hlen) { panic("ipsec46_encapsulate: assumption failed (first mbuf length)"); return EINVAL; } /* generate header checksum */ ip->ip_sum = 0; #ifdef _IP_VHL ip->ip_sum = in_cksum(m, hlen); #else ip->ip_sum = in_cksum(m, hlen); #endif plen = m->m_pkthdr.len; // save original IPv4 packet len, this will be ipv6 payload len /* * First move the IPv4 header to the second mbuf in the chain */ if (M_LEADINGSPACE(m->m_next) < hlen) { struct mbuf *n; MGET(n, M_DONTWAIT, MT_DATA); if (!n) { m_freem(m); return ENOBUFS; } n->m_len = hlen; n->m_next = m->m_next; m->m_next = n; m->m_pkthdr.len += sizeof(struct ip6_hdr); oip = mtod(n, struct ip *); } else { m->m_next->m_len += hlen; m->m_next->m_data -= hlen; m->m_pkthdr.len += sizeof(struct ip6_hdr); oip = mtod(m->m_next, struct ip *); } ip = mtod(m, struct ip *); ovbcopy((caddr_t)ip, (caddr_t)oip, hlen); /* * Grow the first mbuf to accomodate the new IPv6 header. */ if (M_LEADINGSPACE(m) < sizeof(struct ip6_hdr) - hlen) { struct mbuf *n; MGETHDR(n, M_DONTWAIT, MT_HEADER); if (!n) { m_freem(m); return ENOBUFS; } M_COPY_PKTHDR(n, m); MH_ALIGN(n, sizeof(struct ip6_hdr)); n->m_len = sizeof(struct ip6_hdr); n->m_next = m->m_next; m->m_next = NULL; m_freem(m); state->m = n; m = state->m; } else { m->m_len += (sizeof(struct ip6_hdr) - hlen); m->m_data -= (sizeof(struct ip6_hdr) - hlen); } ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ /* ECN consideration. */ ip46_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &ip->ip_tos); if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) { ip6->ip6_plen = htons((u_int16_t)plen); } else { /* ip6->ip6_plen will be updated in ip6_output() */ } ip6->ip6_nxt = IPPROTO_IPV4; ip6->ip6_hlim = IPV6_DEFHLIM; bcopy(&((struct sockaddr_in6 *)&sav->sah->saidx.src)->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); bcopy(&((struct sockaddr_in6 *)&sav->sah->saidx.dst)->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); return 0; } /* * Check the variable replay window. * ipsec_chkreplay() performs replay check before ICV verification. * ipsec_updatereplay() updates replay bitmap. This must be called after * ICV verification (it also performs replay check, which is usually done * beforehand). * 0 (zero) is returned if packet disallowed, 1 if packet permitted. * * based on RFC 2401. */ int ipsec_chkreplay(u_int32_t seq, struct secasvar *sav, u_int8_t replay_index) { const struct secreplay *replay; u_int32_t diff; size_t fr; size_t wsizeb; /* constant: bits of window size */ size_t frlast; /* constant: last frame */ /* sanity check */ if (sav == NULL) { panic("ipsec_chkreplay: NULL pointer was passed.\n"); } lck_mtx_lock(sadb_mutex); replay = sav->replay[replay_index]; if (replay->wsize == 0) { lck_mtx_unlock(sadb_mutex); return 1; /* no need to check replay. */ } /* constant */ frlast = replay->wsize - 1; wsizeb = replay->wsize << 3; /* sequence number of 0 is invalid */ if (seq == 0) { lck_mtx_unlock(sadb_mutex); return 0; } /* first time is always okay */ if (replay->count == 0) { lck_mtx_unlock(sadb_mutex); return 1; } if (seq > replay->lastseq) { /* larger sequences are okay */ lck_mtx_unlock(sadb_mutex); return 1; } else { /* seq is equal or less than lastseq. */ diff = replay->lastseq - seq; /* over range to check, i.e. too old or wrapped */ if (diff >= wsizeb) { lck_mtx_unlock(sadb_mutex); return 0; } fr = frlast - diff / 8; /* this packet already seen ? */ if ((replay->bitmap)[fr] & (1 << (diff % 8))) { lck_mtx_unlock(sadb_mutex); return 0; } /* out of order but good */ lck_mtx_unlock(sadb_mutex); return 1; } } /* * check replay counter whether to update or not. * OUT: 0: OK * 1: NG */ int ipsec_updatereplay(u_int32_t seq, struct secasvar *sav, u_int8_t replay_index) { struct secreplay *replay; u_int32_t diff; size_t fr; size_t wsizeb; /* constant: bits of window size */ size_t frlast; /* constant: last frame */ /* sanity check */ if (sav == NULL) { panic("ipsec_chkreplay: NULL pointer was passed.\n"); } lck_mtx_lock(sadb_mutex); replay = sav->replay[replay_index]; if (replay->wsize == 0) { goto ok; /* no need to check replay. */ } /* constant */ frlast = replay->wsize - 1; wsizeb = replay->wsize << 3; /* sequence number of 0 is invalid */ if (seq == 0) { lck_mtx_unlock(sadb_mutex); return 1; } /* first time */ if (replay->count == 0) { replay->lastseq = seq; bzero(replay->bitmap, replay->wsize); (replay->bitmap)[frlast] = 1; goto ok; } if (seq > replay->lastseq) { /* seq is larger than lastseq. */ diff = seq - replay->lastseq; /* new larger sequence number */ if (diff < wsizeb) { /* In window */ /* set bit for this packet */ vshiftl((unsigned char *) replay->bitmap, diff, replay->wsize); (replay->bitmap)[frlast] |= 1; } else { /* this packet has a "way larger" */ bzero(replay->bitmap, replay->wsize); (replay->bitmap)[frlast] = 1; } replay->lastseq = seq; /* larger is good */ } else { /* seq is equal or less than lastseq. */ diff = replay->lastseq - seq; /* over range to check, i.e. too old or wrapped */ if (diff >= wsizeb) { lck_mtx_unlock(sadb_mutex); return 1; } fr = frlast - diff / 8; /* this packet already seen ? */ if ((replay->bitmap)[fr] & (1 << (diff % 8))) { lck_mtx_unlock(sadb_mutex); return 1; } /* mark as seen */ (replay->bitmap)[fr] |= (1 << (diff % 8)); /* out of order but good */ } ok: if (replay->count == ~0) { /* set overflow flag */ replay->overflow++; /* don't increment, no more packets accepted */ if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) { lck_mtx_unlock(sadb_mutex); return 1; } ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", replay->overflow, ipsec_logsastr(sav))); } replay->count++; lck_mtx_unlock(sadb_mutex); return 0; } /* * shift variable length buffer to left. * IN: bitmap: pointer to the buffer * nbit: the number of to shift. * wsize: buffer size (bytes). */ static void vshiftl(unsigned char *bitmap, int nbit, size_t wsize) { size_t i; int s, j; unsigned char over; for (j = 0; j < nbit; j += 8) { s = (nbit - j < 8) ? (nbit - j): 8; bitmap[0] <<= s; for (i = 1; i < wsize; i++) { over = (bitmap[i] >> (8 - s)); bitmap[i] <<= s; bitmap[i - 1] |= over; } } return; } const char * ipsec4_logpacketstr(struct ip *ip, u_int32_t spi) { static char buf[256] __attribute__((aligned(4))); char *p; u_int8_t *s, *d; s = (u_int8_t *)(&ip->ip_src); d = (u_int8_t *)(&ip->ip_dst); p = buf; snprintf(buf, sizeof(buf), "packet(SPI=%u ", (u_int32_t)ntohl(spi)); while (p && *p) { p++; } snprintf(p, sizeof(buf) - (p - buf), "src=%u.%u.%u.%u", s[0], s[1], s[2], s[3]); while (p && *p) { p++; } snprintf(p, sizeof(buf) - (p - buf), " dst=%u.%u.%u.%u", d[0], d[1], d[2], d[3]); while (p && *p) { p++; } snprintf(p, sizeof(buf) - (p - buf), ")"); return buf; } const char * ipsec6_logpacketstr(struct ip6_hdr *ip6, u_int32_t spi) { static char buf[256] __attribute__((aligned(4))); char *p; p = buf; snprintf(buf, sizeof(buf), "packet(SPI=%u ", (u_int32_t)ntohl(spi)); while (p && *p) { p++; } snprintf(p, sizeof(buf) - (p - buf), "src=%s", ip6_sprintf(&ip6->ip6_src)); while (p && *p) { p++; } snprintf(p, sizeof(buf) - (p - buf), " dst=%s", ip6_sprintf(&ip6->ip6_dst)); while (p && *p) { p++; } snprintf(p, sizeof(buf) - (p - buf), ")"); return buf; } const char * ipsec_logsastr(struct secasvar *sav) { static char buf[256] __attribute__((aligned(4))); char *p; struct secasindex *saidx = &sav->sah->saidx; /* validity check */ if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family != ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family) { panic("ipsec_logsastr: family mismatched.\n"); } p = buf; snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); while (p && *p) { p++; } if (((struct sockaddr *)&saidx->src)->sa_family == AF_INET) { u_int8_t *s, *d; s = (u_int8_t *)&((struct sockaddr_in *)&saidx->src)->sin_addr; d = (u_int8_t *)&((struct sockaddr_in *)&saidx->dst)->sin_addr; snprintf(p, sizeof(buf) - (p - buf), "src=%d.%d.%d.%d dst=%d.%d.%d.%d", s[0], s[1], s[2], s[3], d[0], d[1], d[2], d[3]); } else if (((struct sockaddr *)&saidx->src)->sa_family == AF_INET6) { snprintf(p, sizeof(buf) - (p - buf), "src=%s", ip6_sprintf(&((struct sockaddr_in6 *)&saidx->src)->sin6_addr)); while (p && *p) { p++; } snprintf(p, sizeof(buf) - (p - buf), " dst=%s", ip6_sprintf(&((struct sockaddr_in6 *)&saidx->dst)->sin6_addr)); } while (p && *p) { p++; } snprintf(p, sizeof(buf) - (p - buf), ")"); return buf; } void ipsec_dumpmbuf(struct mbuf *m) { int totlen; int i; u_char *p; totlen = 0; printf("---\n"); while (m) { p = mtod(m, u_char *); for (i = 0; i < m->m_len; i++) { printf("%02x ", p[i]); totlen++; if (totlen % 16 == 0) { printf("\n"); } } m = m->m_next; } if (totlen % 16 != 0) { printf("\n"); } printf("---\n"); } #if INET /* * IPsec output logic for IPv4. */ static int ipsec4_output_internal(struct ipsec_output_state *state, struct secasvar *sav) { struct ip *ip = NULL; int error = 0; struct sockaddr_in *dst4; struct route *ro4; /* validity check */ if (sav == NULL || sav->sah == NULL) { error = EINVAL; goto bad; } /* * If there is no valid SA, we give up to process any * more. In such a case, the SA's status is changed * from DYING to DEAD after allocating. If a packet * send to the receiver by dead SA, the receiver can * not decode a packet because SA has been dead. */ if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { IPSEC_STAT_INCREMENT(ipsecstat.out_nosa); error = EINVAL; goto bad; } state->outgoing_if = sav->sah->outgoing_if; /* * There may be the case that SA status will be changed when * we are refering to one. So calling splsoftnet(). */ if (sav->sah->saidx.mode == IPSEC_MODE_TUNNEL) { /* * build IPsec tunnel. */ state->m = ipsec4_splithdr(state->m); if (!state->m) { error = ENOMEM; goto bad; } if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family == AF_INET6) { error = ipsec46_encapsulate(state, sav); if (error) { // packet already freed by encapsulation error handling state->m = NULL; return error; } error = ipsec6_update_routecache_and_output(state, sav); return error; } else if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family == AF_INET) { error = ipsec4_encapsulate(state->m, sav); if (error) { state->m = NULL; goto bad; } ip = mtod(state->m, struct ip *); // grab sadb_mutex, before updating sah's route cache lck_mtx_lock(sadb_mutex); ro4 = (struct route *)&sav->sah->sa_route; dst4 = (struct sockaddr_in *)(void *)&ro4->ro_dst; if (ro4->ro_rt != NULL) { RT_LOCK(ro4->ro_rt); } if (ROUTE_UNUSABLE(ro4) || dst4->sin_addr.s_addr != ip->ip_dst.s_addr) { if (ro4->ro_rt != NULL) { RT_UNLOCK(ro4->ro_rt); } ROUTE_RELEASE(ro4); } if (ro4->ro_rt == 0) { dst4->sin_family = AF_INET; dst4->sin_len = sizeof(*dst4); dst4->sin_addr = ip->ip_dst; rtalloc_scoped(ro4, sav->sah->outgoing_if); if (ro4->ro_rt == 0) { OSAddAtomic(1, &ipstat.ips_noroute); error = EHOSTUNREACH; // release sadb_mutex, after updating sah's route cache lck_mtx_unlock(sadb_mutex); goto bad; } RT_LOCK(ro4->ro_rt); } /* * adjust state->dst if tunnel endpoint is offlink * * XXX: caching rt_gateway value in the state is * not really good, since it may point elsewhere * when the gateway gets modified to a larger * sockaddr via rt_setgate(). This is currently * addressed by SA_SIZE roundup in that routine. */ if (ro4->ro_rt->rt_flags & RTF_GATEWAY) { dst4 = (struct sockaddr_in *)(void *)ro4->ro_rt->rt_gateway; } RT_UNLOCK(ro4->ro_rt); ROUTE_RELEASE(&state->ro); route_copyout((struct route *)&state->ro, ro4, sizeof(struct route)); state->dst = (struct sockaddr *)dst4; state->tunneled = 4; // release sadb_mutex, after updating sah's route cache lck_mtx_unlock(sadb_mutex); } else { ipseclog((LOG_ERR, "%s: family mismatched between inner and outer spi=%u\n", __FUNCTION__, (u_int32_t)ntohl(sav->spi))); error = EAFNOSUPPORT; goto bad; } } state->m = ipsec4_splithdr(state->m); if (!state->m) { error = ENOMEM; goto bad; } switch (sav->sah->saidx.proto) { case IPPROTO_ESP: #if IPSEC_ESP if ((error = esp4_output(state->m, sav)) != 0) { state->m = NULL; goto bad; } break; #else m_freem(state->m); state->m = NULL; error = EINVAL; goto bad; #endif case IPPROTO_AH: if ((error = ah4_output(state->m, sav)) != 0) { state->m = NULL; goto bad; } break; default: ipseclog((LOG_ERR, "ipsec4_output: unknown ipsec protocol %d\n", sav->sah->saidx.proto)); m_freem(state->m); state->m = NULL; error = EPROTONOSUPPORT; goto bad; } if (state->m == 0) { error = ENOMEM; goto bad; } return 0; bad: return error; } int ipsec4_interface_output(struct ipsec_output_state *state, ifnet_t interface) { int error = 0; struct secasvar *sav = NULL; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); if (state == NULL) { panic("state == NULL in ipsec4_output"); } if (state->m == NULL) { panic("state->m == NULL in ipsec4_output"); } if (state->dst == NULL) { panic("state->dst == NULL in ipsec4_output"); } struct ip *ip = mtod(state->m, struct ip *); struct sockaddr_in src = {}; src.sin_family = AF_INET; src.sin_len = sizeof(src); memcpy(&src.sin_addr, &ip->ip_src, sizeof(src.sin_addr)); struct sockaddr_in dst = {}; dst.sin_family = AF_INET; dst.sin_len = sizeof(dst); memcpy(&dst.sin_addr, &ip->ip_dst, sizeof(dst.sin_addr)); sav = key_alloc_outbound_sav_for_interface(interface, AF_INET, (struct sockaddr *)&src, (struct sockaddr *)&dst); if (sav == NULL) { goto bad; } if ((error = ipsec4_output_internal(state, sav)) != 0) { goto bad; } KERNEL_DEBUG(DBG_FNC_IPSEC_OUT | DBG_FUNC_END, 0, 0, 0, 0, 0); if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } return 0; bad: if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } m_freem(state->m); state->m = NULL; KERNEL_DEBUG(DBG_FNC_IPSEC_OUT | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } int ipsec4_output(struct ipsec_output_state *state, struct secpolicy *sp, __unused int flags) { struct ip *ip = NULL; struct ipsecrequest *isr = NULL; struct secasindex saidx; struct secasvar *sav = NULL; int error = 0; struct sockaddr_in *sin; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); if (!state) { panic("state == NULL in ipsec4_output"); } if (!state->m) { panic("state->m == NULL in ipsec4_output"); } if (!state->dst) { panic("state->dst == NULL in ipsec4_output"); } KERNEL_DEBUG(DBG_FNC_IPSEC_OUT | DBG_FUNC_START, 0, 0, 0, 0, 0); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec4_output: applied SP\n"); kdebug_secpolicy(sp)); for (isr = sp->req; isr != NULL; isr = isr->next) { /* make SA index for search proper SA */ ip = mtod(state->m, struct ip *); bcopy(&isr->saidx, &saidx, sizeof(saidx)); saidx.mode = isr->saidx.mode; saidx.reqid = isr->saidx.reqid; sin = (struct sockaddr_in *)&saidx.src; if (sin->sin_len == 0) { sin->sin_len = sizeof(*sin); sin->sin_family = AF_INET; sin->sin_port = IPSEC_PORT_ANY; bcopy(&ip->ip_src, &sin->sin_addr, sizeof(sin->sin_addr)); } sin = (struct sockaddr_in *)&saidx.dst; if (sin->sin_len == 0) { sin->sin_len = sizeof(*sin); sin->sin_family = AF_INET; sin->sin_port = IPSEC_PORT_ANY; /* * Get port from packet if upper layer is UDP and nat traversal * is enabled and transport mode. */ if ((esp_udp_encap_port & 0xFFFF) != 0 && isr->saidx.mode == IPSEC_MODE_TRANSPORT) { if (ip->ip_p == IPPROTO_UDP) { struct udphdr *udp; u_int32_t hlen; #ifdef _IP_VHL hlen = IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif if (state->m->m_len < hlen + sizeof(struct udphdr)) { state->m = m_pullup(state->m, hlen + sizeof(struct udphdr)); if (!state->m) { ipseclog((LOG_DEBUG, "IPv4 output: can't pullup UDP header\n")); IPSEC_STAT_INCREMENT(ipsecstat.in_inval); goto bad; } ip = mtod(state->m, struct ip *); } udp = (struct udphdr *)(void *)(((u_int8_t *)ip) + hlen); sin->sin_port = udp->uh_dport; } } bcopy(&ip->ip_dst, &sin->sin_addr, sizeof(sin->sin_addr)); } if ((error = key_checkrequest(isr, &saidx, &sav)) != 0) { /* * IPsec processing is required, but no SA found. * I assume that key_acquire() had been called * to get/establish the SA. Here I discard * this packet because it is responsibility for * upper layer to retransmit the packet. */ IPSEC_STAT_INCREMENT(ipsecstat.out_nosa); goto bad; } /* validity check */ if (sav == NULL) { switch (ipsec_get_reqlevel(isr)) { case IPSEC_LEVEL_USE: continue; case IPSEC_LEVEL_REQUIRE: /* must be not reached here. */ panic("ipsec4_output: no SA found, but required."); } } if ((error = ipsec4_output_internal(state, sav)) != 0) { goto bad; } } KERNEL_DEBUG(DBG_FNC_IPSEC_OUT | DBG_FUNC_END, 0, 0, 0, 0, 0); if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } return 0; bad: if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } m_freem(state->m); state->m = NULL; KERNEL_DEBUG(DBG_FNC_IPSEC_OUT | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } #endif /* * IPsec output logic for IPv6, transport mode. */ static int ipsec6_output_trans_internal( struct ipsec_output_state *state, struct secasvar *sav, u_char *nexthdrp, struct mbuf *mprev) { struct ip6_hdr *ip6; size_t plen; int error = 0; /* validity check */ if (sav == NULL || sav->sah == NULL) { error = EINVAL; goto bad; } /* * If there is no valid SA, we give up to process. * see same place at ipsec4_output(). */ if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { IPSEC_STAT_INCREMENT(ipsec6stat.out_nosa); error = EINVAL; goto bad; } state->outgoing_if = sav->sah->outgoing_if; switch (sav->sah->saidx.proto) { case IPPROTO_ESP: #if IPSEC_ESP error = esp6_output(state->m, nexthdrp, mprev->m_next, sav); #else m_freem(state->m); error = EINVAL; #endif break; case IPPROTO_AH: error = ah6_output(state->m, nexthdrp, mprev->m_next, sav); break; default: ipseclog((LOG_ERR, "ipsec6_output_trans: " "unknown ipsec protocol %d\n", sav->sah->saidx.proto)); m_freem(state->m); IPSEC_STAT_INCREMENT(ipsec6stat.out_inval); error = EPROTONOSUPPORT; break; } if (error) { state->m = NULL; goto bad; } plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr); if (plen > IPV6_MAXPACKET) { ipseclog((LOG_ERR, "ipsec6_output_trans: " "IPsec with IPv6 jumbogram is not supported\n")); IPSEC_STAT_INCREMENT(ipsec6stat.out_inval); error = EINVAL; /*XXX*/ goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); ip6->ip6_plen = htons((u_int16_t)plen); return 0; bad: return error; } int ipsec6_output_trans( struct ipsec_output_state *state, u_char *nexthdrp, struct mbuf *mprev, struct secpolicy *sp, __unused int flags, int *tun) { struct ip6_hdr *ip6; struct ipsecrequest *isr = NULL; struct secasindex saidx; int error = 0; struct sockaddr_in6 *sin6; struct secasvar *sav = NULL; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); if (!state) { panic("state == NULL in ipsec6_output_trans"); } if (!state->m) { panic("state->m == NULL in ipsec6_output_trans"); } if (!nexthdrp) { panic("nexthdrp == NULL in ipsec6_output_trans"); } if (!mprev) { panic("mprev == NULL in ipsec6_output_trans"); } if (!sp) { panic("sp == NULL in ipsec6_output_trans"); } if (!tun) { panic("tun == NULL in ipsec6_output_trans"); } KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec6_output_trans: applyed SP\n"); kdebug_secpolicy(sp)); *tun = 0; for (isr = sp->req; isr; isr = isr->next) { if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { /* the rest will be handled by ipsec6_output_tunnel() */ break; } /* make SA index for search proper SA */ ip6 = mtod(state->m, struct ip6_hdr *); bcopy(&isr->saidx, &saidx, sizeof(saidx)); saidx.mode = isr->saidx.mode; saidx.reqid = isr->saidx.reqid; sin6 = (struct sockaddr_in6 *)&saidx.src; if (sin6->sin6_len == 0) { sin6->sin6_len = sizeof(*sin6); sin6->sin6_family = AF_INET6; sin6->sin6_port = IPSEC_PORT_ANY; bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { /* fix scope id for comparing SPD */ sin6->sin6_addr.s6_addr16[1] = 0; sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); } } sin6 = (struct sockaddr_in6 *)&saidx.dst; if (sin6->sin6_len == 0) { sin6->sin6_len = sizeof(*sin6); sin6->sin6_family = AF_INET6; sin6->sin6_port = IPSEC_PORT_ANY; bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { /* fix scope id for comparing SPD */ sin6->sin6_addr.s6_addr16[1] = 0; sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); } } if (key_checkrequest(isr, &saidx, &sav) == ENOENT) { /* * IPsec processing is required, but no SA found. * I assume that key_acquire() had been called * to get/establish the SA. Here I discard * this packet because it is responsibility for * upper layer to retransmit the packet. */ IPSEC_STAT_INCREMENT(ipsec6stat.out_nosa); error = ENOENT; /* * Notify the fact that the packet is discarded * to ourselves. I believe this is better than * just silently discarding. (jinmei@kame.net) * XXX: should we restrict the error to TCP packets? * XXX: should we directly notify sockets via * pfctlinputs? */ icmp6_error(state->m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN, 0); state->m = NULL; /* icmp6_error freed the mbuf */ goto bad; } /* validity check */ if (sav == NULL) { switch (ipsec_get_reqlevel(isr)) { case IPSEC_LEVEL_USE: continue; case IPSEC_LEVEL_REQUIRE: /* must be not reached here. */ panic("ipsec6_output_trans: no SA found, but required."); } } if ((error = ipsec6_output_trans_internal(state, sav, nexthdrp, mprev)) != 0) { goto bad; } } /* if we have more to go, we need a tunnel mode processing */ if (isr != NULL) { *tun = 1; } if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } return 0; bad: if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } m_freem(state->m); state->m = NULL; return error; } /* * IPsec output logic for IPv6, tunnel mode. */ static int ipsec6_output_tunnel_internal(struct ipsec_output_state *state, struct secasvar *sav, int *must_be_last) { struct ip6_hdr *ip6; struct sockaddr_in6* dst6; struct route_in6 *ro6; size_t plen; int error = 0; /* validity check */ if (sav == NULL || sav->sah == NULL || sav->sah->saidx.mode != IPSEC_MODE_TUNNEL) { error = EINVAL; goto bad; } /* * If there is no valid SA, we give up to process. * see same place at ipsec4_output(). */ if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { IPSEC_STAT_INCREMENT(ipsec6stat.out_nosa); error = EINVAL; goto bad; } state->outgoing_if = sav->sah->outgoing_if; if (sav->sah->saidx.mode == IPSEC_MODE_TUNNEL) { /* * build IPsec tunnel. */ state->m = ipsec6_splithdr(state->m); if (!state->m) { IPSEC_STAT_INCREMENT(ipsec6stat.out_nomem); error = ENOMEM; goto bad; } if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family == AF_INET6) { error = ipsec6_encapsulate(state->m, sav); if (error) { state->m = 0; goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); } else if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family == AF_INET) { struct ip *ip; struct sockaddr_in* dst4; struct route *ro4 = NULL; struct route ro4_copy; struct ip_out_args ipoa; bzero(&ipoa, sizeof(ipoa)); ipoa.ipoa_boundif = IFSCOPE_NONE; ipoa.ipoa_flags = IPOAF_SELECT_SRCIF; ipoa.ipoa_sotc = SO_TC_UNSPEC; ipoa.ipoa_netsvctype = _NET_SERVICE_TYPE_UNSPEC; if (must_be_last) { *must_be_last = 1; } state->tunneled = 4; /* must not process any further in ip6_output */ error = ipsec64_encapsulate(state->m, sav); if (error) { state->m = 0; goto bad; } /* Now we have an IPv4 packet */ ip = mtod(state->m, struct ip *); // grab sadb_mutex, to update sah's route cache and get a local copy of it lck_mtx_lock(sadb_mutex); ro4 = (struct route *)&sav->sah->sa_route; dst4 = (struct sockaddr_in *)(void *)&ro4->ro_dst; if (ro4->ro_rt) { RT_LOCK(ro4->ro_rt); } if (ROUTE_UNUSABLE(ro4) || dst4->sin_addr.s_addr != ip->ip_dst.s_addr) { if (ro4->ro_rt != NULL) { RT_UNLOCK(ro4->ro_rt); } ROUTE_RELEASE(ro4); } if (ro4->ro_rt == NULL) { dst4->sin_family = AF_INET; dst4->sin_len = sizeof(*dst4); dst4->sin_addr = ip->ip_dst; } else { RT_UNLOCK(ro4->ro_rt); } route_copyout(&ro4_copy, ro4, sizeof(struct route)); // release sadb_mutex, after updating sah's route cache and getting a local copy lck_mtx_unlock(sadb_mutex); state->m = ipsec4_splithdr(state->m); if (!state->m) { error = ENOMEM; ROUTE_RELEASE(&ro4_copy); goto bad; } switch (sav->sah->saidx.proto) { case IPPROTO_ESP: #if IPSEC_ESP if ((error = esp4_output(state->m, sav)) != 0) { state->m = NULL; ROUTE_RELEASE(&ro4_copy); goto bad; } break; #else m_freem(state->m); state->m = NULL; error = EINVAL; ROUTE_RELEASE(&ro4_copy); goto bad; #endif case IPPROTO_AH: if ((error = ah4_output(state->m, sav)) != 0) { state->m = NULL; ROUTE_RELEASE(&ro4_copy); goto bad; } break; default: ipseclog((LOG_ERR, "ipsec4_output: unknown ipsec protocol %d\n", sav->sah->saidx.proto)); m_freem(state->m); state->m = NULL; error = EPROTONOSUPPORT; ROUTE_RELEASE(&ro4_copy); goto bad; } if (state->m == 0) { error = ENOMEM; ROUTE_RELEASE(&ro4_copy); goto bad; } ipsec_set_pkthdr_for_interface(sav->sah->ipsec_if, state->m, AF_INET); ipsec_set_ipoa_for_interface(sav->sah->ipsec_if, &ipoa); ip = mtod(state->m, struct ip *); ip->ip_len = ntohs(ip->ip_len); /* flip len field before calling ip_output */ error = ip_output(state->m, NULL, &ro4_copy, IP_OUTARGS, NULL, &ipoa); state->m = NULL; // grab sadb_mutex, to synchronize the sah's route cache with the local copy lck_mtx_lock(sadb_mutex); route_copyin(&ro4_copy, ro4, sizeof(struct route)); lck_mtx_unlock(sadb_mutex); if (error != 0) { goto bad; } goto done; } else { ipseclog((LOG_ERR, "ipsec6_output_tunnel: " "unsupported inner family, spi=%u\n", (u_int32_t)ntohl(sav->spi))); IPSEC_STAT_INCREMENT(ipsec6stat.out_inval); error = EAFNOSUPPORT; goto bad; } // grab sadb_mutex, before updating sah's route cache lck_mtx_lock(sadb_mutex); ro6 = &sav->sah->sa_route; dst6 = (struct sockaddr_in6 *)(void *)&ro6->ro_dst; if (ro6->ro_rt) { RT_LOCK(ro6->ro_rt); } if (ROUTE_UNUSABLE(ro6) || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst)) { if (ro6->ro_rt != NULL) { RT_UNLOCK(ro6->ro_rt); } ROUTE_RELEASE(ro6); } if (ro6->ro_rt == 0) { bzero(dst6, sizeof(*dst6)); dst6->sin6_family = AF_INET6; dst6->sin6_len = sizeof(*dst6); dst6->sin6_addr = ip6->ip6_dst; rtalloc_scoped((struct route *)ro6, sav->sah->outgoing_if); if (ro6->ro_rt) { RT_LOCK(ro6->ro_rt); } } if (ro6->ro_rt == 0) { ip6stat.ip6s_noroute++; IPSEC_STAT_INCREMENT(ipsec6stat.out_noroute); error = EHOSTUNREACH; // release sadb_mutex, after updating sah's route cache lck_mtx_unlock(sadb_mutex); goto bad; } /* * adjust state->dst if tunnel endpoint is offlink * * XXX: caching rt_gateway value in the state is * not really good, since it may point elsewhere * when the gateway gets modified to a larger * sockaddr via rt_setgate(). This is currently * addressed by SA_SIZE roundup in that routine. */ if (ro6->ro_rt->rt_flags & RTF_GATEWAY) { dst6 = (struct sockaddr_in6 *)(void *)ro6->ro_rt->rt_gateway; } RT_UNLOCK(ro6->ro_rt); ROUTE_RELEASE(&state->ro); route_copyout((struct route *)&state->ro, (struct route *)ro6, sizeof(struct route_in6)); state->dst = (struct sockaddr *)dst6; state->tunneled = 6; // release sadb_mutex, after updating sah's route cache lck_mtx_unlock(sadb_mutex); } state->m = ipsec6_splithdr(state->m); if (!state->m) { IPSEC_STAT_INCREMENT(ipsec6stat.out_nomem); error = ENOMEM; goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); switch (sav->sah->saidx.proto) { case IPPROTO_ESP: #if IPSEC_ESP error = esp6_output(state->m, &ip6->ip6_nxt, state->m->m_next, sav); #else m_freem(state->m); error = EINVAL; #endif break; case IPPROTO_AH: error = ah6_output(state->m, &ip6->ip6_nxt, state->m->m_next, sav); break; default: ipseclog((LOG_ERR, "ipsec6_output_tunnel: " "unknown ipsec protocol %d\n", sav->sah->saidx.proto)); m_freem(state->m); IPSEC_STAT_INCREMENT(ipsec6stat.out_inval); error = EINVAL; break; } if (error) { state->m = NULL; goto bad; } plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr); if (plen > IPV6_MAXPACKET) { ipseclog((LOG_ERR, "ipsec6_output_tunnel: " "IPsec with IPv6 jumbogram is not supported\n")); IPSEC_STAT_INCREMENT(ipsec6stat.out_inval); error = EINVAL; /*XXX*/ goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); ip6->ip6_plen = htons((u_int16_t)plen); done: return 0; bad: return error; } int ipsec6_output_tunnel( struct ipsec_output_state *state, struct secpolicy *sp, __unused int flags) { struct ip6_hdr *ip6; struct ipsecrequest *isr = NULL; struct secasindex saidx; struct secasvar *sav = NULL; int error = 0; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); if (!state) { panic("state == NULL in ipsec6_output_tunnel"); } if (!state->m) { panic("state->m == NULL in ipsec6_output_tunnel"); } if (!sp) { panic("sp == NULL in ipsec6_output_tunnel"); } KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec6_output_tunnel: applyed SP\n"); kdebug_secpolicy(sp)); /* * transport mode ipsec (before the 1st tunnel mode) is already * processed by ipsec6_output_trans(). */ for (isr = sp->req; isr; isr = isr->next) { if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { break; } } for (/* already initialized */; isr; isr = isr->next) { if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { /* When tunnel mode, SA peers must be specified. */ bcopy(&isr->saidx, &saidx, sizeof(saidx)); } else { /* make SA index to look for a proper SA */ struct sockaddr_in6 *sin6; bzero(&saidx, sizeof(saidx)); saidx.proto = isr->saidx.proto; saidx.mode = isr->saidx.mode; saidx.reqid = isr->saidx.reqid; ip6 = mtod(state->m, struct ip6_hdr *); sin6 = (struct sockaddr_in6 *)&saidx.src; if (sin6->sin6_len == 0) { sin6->sin6_len = sizeof(*sin6); sin6->sin6_family = AF_INET6; sin6->sin6_port = IPSEC_PORT_ANY; bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { /* fix scope id for comparing SPD */ sin6->sin6_addr.s6_addr16[1] = 0; sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); } } sin6 = (struct sockaddr_in6 *)&saidx.dst; if (sin6->sin6_len == 0) { sin6->sin6_len = sizeof(*sin6); sin6->sin6_family = AF_INET6; sin6->sin6_port = IPSEC_PORT_ANY; bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { /* fix scope id for comparing SPD */ sin6->sin6_addr.s6_addr16[1] = 0; sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); } } } if (key_checkrequest(isr, &saidx, &sav) == ENOENT) { /* * IPsec processing is required, but no SA found. * I assume that key_acquire() had been called * to get/establish the SA. Here I discard * this packet because it is responsibility for * upper layer to retransmit the packet. */ IPSEC_STAT_INCREMENT(ipsec6stat.out_nosa); error = ENOENT; goto bad; } /* validity check */ if (sav == NULL) { switch (ipsec_get_reqlevel(isr)) { case IPSEC_LEVEL_USE: continue; case IPSEC_LEVEL_REQUIRE: /* must be not reached here. */ panic("ipsec6_output_tunnel: no SA found, but required."); } } /* * If there is no valid SA, we give up to process. * see same place at ipsec4_output(). */ if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { IPSEC_STAT_INCREMENT(ipsec6stat.out_nosa); error = EINVAL; goto bad; } int must_be_last = 0; if ((error = ipsec6_output_tunnel_internal(state, sav, &must_be_last)) != 0) { goto bad; } if (must_be_last && isr->next) { ipseclog((LOG_ERR, "ipsec6_output_tunnel: " "IPv4 must be outer layer, spi=%u\n", (u_int32_t)ntohl(sav->spi))); error = EINVAL; goto bad; } } if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } return 0; bad: if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } if (state->m) { m_freem(state->m); } state->m = NULL; return error; } int ipsec6_interface_output(struct ipsec_output_state *state, ifnet_t interface, u_char *nexthdrp, struct mbuf *mprev) { int error = 0; struct secasvar *sav = NULL; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); if (state == NULL) { panic("state == NULL in ipsec6_output"); } if (state->m == NULL) { panic("state->m == NULL in ipsec6_output"); } if (nexthdrp == NULL) { panic("nexthdrp == NULL in ipsec6_output"); } if (mprev == NULL) { panic("mprev == NULL in ipsec6_output"); } struct ip6_hdr *ip6 = mtod(state->m, struct ip6_hdr *); struct sockaddr_in6 src = {}; src.sin6_family = AF_INET6; src.sin6_len = sizeof(src); memcpy(&src.sin6_addr, &ip6->ip6_src, sizeof(src.sin6_addr)); struct sockaddr_in6 dst = {}; dst.sin6_family = AF_INET6; dst.sin6_len = sizeof(dst); memcpy(&dst.sin6_addr, &ip6->ip6_dst, sizeof(dst.sin6_addr)); sav = key_alloc_outbound_sav_for_interface(interface, AF_INET6, (struct sockaddr *)&src, (struct sockaddr *)&dst); if (sav == NULL) { goto bad; } if (sav->sah && sav->sah->saidx.mode == IPSEC_MODE_TUNNEL) { if ((error = ipsec6_output_tunnel_internal(state, sav, NULL)) != 0) { goto bad; } } else { if ((error = ipsec6_output_trans_internal(state, sav, nexthdrp, mprev)) != 0) { goto bad; } } if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } return 0; bad: if (sav) { key_freesav(sav, KEY_SADB_UNLOCKED); } m_freem(state->m); state->m = NULL; return error; } #if INET /* * Chop IP header and option off from the payload. */ struct mbuf * ipsec4_splithdr(struct mbuf *m) { struct mbuf *mh; struct ip *ip; int hlen; if (m->m_len < sizeof(struct ip)) { panic("ipsec4_splithdr: first mbuf too short, m_len %d, pkt_len %d, m_flag %x", m->m_len, m->m_pkthdr.len, m->m_flags); } ip = mtod(m, struct ip *); #ifdef _IP_VHL hlen = _IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif if (m->m_len > hlen) { MGETHDR(mh, M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (!mh) { m_freem(m); return NULL; } M_COPY_PKTHDR(mh, m); MH_ALIGN(mh, hlen); m->m_flags &= ~M_PKTHDR; m_mchtype(m, MT_DATA); m->m_len -= hlen; m->m_data += hlen; mh->m_next = m; m = mh; m->m_len = hlen; bcopy((caddr_t)ip, mtod(m, caddr_t), hlen); } else if (m->m_len < hlen) { m = m_pullup(m, hlen); if (!m) { return NULL; } } return m; } #endif struct mbuf * ipsec6_splithdr(struct mbuf *m) { struct mbuf *mh; struct ip6_hdr *ip6; int hlen; if (m->m_len < sizeof(struct ip6_hdr)) { panic("ipsec6_splithdr: first mbuf too short"); } ip6 = mtod(m, struct ip6_hdr *); hlen = sizeof(struct ip6_hdr); if (m->m_len > hlen) { MGETHDR(mh, M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (!mh) { m_freem(m); return NULL; } M_COPY_PKTHDR(mh, m); MH_ALIGN(mh, hlen); m->m_flags &= ~M_PKTHDR; m_mchtype(m, MT_DATA); m->m_len -= hlen; m->m_data += hlen; mh->m_next = m; m = mh; m->m_len = hlen; bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); } else if (m->m_len < hlen) { m = m_pullup(m, hlen); if (!m) { return NULL; } } return m; } /* validate inbound IPsec tunnel packet. */ int ipsec4_tunnel_validate( struct mbuf *m, /* no pullup permitted, m->m_len >= ip */ int off, u_int nxt0, struct secasvar *sav, sa_family_t *ifamily) { u_int8_t nxt = nxt0 & 0xff; struct sockaddr_in *sin; struct sockaddr_in osrc, odst, i4src, i4dst; struct sockaddr_in6 i6src, i6dst; int hlen; struct secpolicy *sp; struct ip *oip; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); #if DIAGNOSTIC if (m->m_len < sizeof(struct ip)) { panic("too short mbuf on ipsec4_tunnel_validate"); } #endif if (nxt != IPPROTO_IPV4 && nxt != IPPROTO_IPV6) { return 0; } if (m->m_pkthdr.len < off + sizeof(struct ip)) { return 0; } /* do not decapsulate if the SA is for transport mode only */ if (sav->sah->saidx.mode == IPSEC_MODE_TRANSPORT) { return 0; } oip = mtod(m, struct ip *); #ifdef _IP_VHL hlen = _IP_VHL_HL(oip->ip_vhl) << 2; #else hlen = oip->ip_hl << 2; #endif if (hlen != sizeof(struct ip)) { return 0; } sin = (struct sockaddr_in *)&sav->sah->saidx.dst; if (sin->sin_family != AF_INET) { return 0; } if (bcmp(&oip->ip_dst, &sin->sin_addr, sizeof(oip->ip_dst)) != 0) { return 0; } if (sav->sah->ipsec_if != NULL) { // the ipsec interface SAs don't have a policies. if (nxt == IPPROTO_IPV4) { *ifamily = AF_INET; } else if (nxt == IPPROTO_IPV6) { *ifamily = AF_INET6; } else { return 0; } return 1; } /* XXX slow */ bzero(&osrc, sizeof(osrc)); bzero(&odst, sizeof(odst)); osrc.sin_family = odst.sin_family = AF_INET; osrc.sin_len = odst.sin_len = sizeof(struct sockaddr_in); osrc.sin_addr = oip->ip_src; odst.sin_addr = oip->ip_dst; /* * RFC2401 5.2.1 (b): (assume that we are using tunnel mode) * - if the inner destination is multicast address, there can be * multiple permissible inner source address. implementation * may want to skip verification of inner source address against * SPD selector. * - if the inner protocol is ICMP, the packet may be an error report * from routers on the other side of the VPN cloud (R in the * following diagram). in this case, we cannot verify inner source * address against SPD selector. * me -- gw === gw -- R -- you * * we consider the first bullet to be users responsibility on SPD entry * configuration (if you need to encrypt multicast traffic, set * the source range of SPD selector to 0.0.0.0/0, or have explicit * address ranges for possible senders). * the second bullet is not taken care of (yet). * * therefore, we do not do anything special about inner source. */ if (nxt == IPPROTO_IPV4) { bzero(&i4src, sizeof(struct sockaddr_in)); bzero(&i4dst, sizeof(struct sockaddr_in)); i4src.sin_family = i4dst.sin_family = *ifamily = AF_INET; i4src.sin_len = i4dst.sin_len = sizeof(struct sockaddr_in); m_copydata(m, off + offsetof(struct ip, ip_src), sizeof(i4src.sin_addr), (caddr_t)&i4src.sin_addr); m_copydata(m, off + offsetof(struct ip, ip_dst), sizeof(i4dst.sin_addr), (caddr_t)&i4dst.sin_addr); sp = key_gettunnel((struct sockaddr *)&osrc, (struct sockaddr *)&odst, (struct sockaddr *)&i4src, (struct sockaddr *)&i4dst); } else if (nxt == IPPROTO_IPV6) { bzero(&i6src, sizeof(struct sockaddr_in6)); bzero(&i6dst, sizeof(struct sockaddr_in6)); i6src.sin6_family = i6dst.sin6_family = *ifamily = AF_INET6; i6src.sin6_len = i6dst.sin6_len = sizeof(struct sockaddr_in6); m_copydata(m, off + offsetof(struct ip6_hdr, ip6_src), sizeof(i6src.sin6_addr), (caddr_t)&i6src.sin6_addr); m_copydata(m, off + offsetof(struct ip6_hdr, ip6_dst), sizeof(i6dst.sin6_addr), (caddr_t)&i6dst.sin6_addr); sp = key_gettunnel((struct sockaddr *)&osrc, (struct sockaddr *)&odst, (struct sockaddr *)&i6src, (struct sockaddr *)&i6dst); } else { return 0; /* unsupported family */ } if (!sp) { return 0; } key_freesp(sp, KEY_SADB_UNLOCKED); return 1; } /* validate inbound IPsec tunnel packet. */ int ipsec6_tunnel_validate( struct mbuf *m, /* no pullup permitted, m->m_len >= ip */ int off, u_int nxt0, struct secasvar *sav, sa_family_t *ifamily) { u_int8_t nxt = nxt0 & 0xff; struct sockaddr_in6 *sin6; struct sockaddr_in i4src, i4dst; struct sockaddr_in6 osrc, odst, i6src, i6dst; struct secpolicy *sp; struct ip6_hdr *oip6; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); #if DIAGNOSTIC if (m->m_len < sizeof(struct ip6_hdr)) { panic("too short mbuf on ipsec6_tunnel_validate"); } #endif if (nxt == IPPROTO_IPV4) { if (m->m_pkthdr.len < off + sizeof(struct ip)) { ipseclog((LOG_NOTICE, "ipsec6_tunnel_validate pkthdr %d off %d ip6hdr %zu", m->m_pkthdr.len, off, sizeof(struct ip6_hdr))); return 0; } } else if (nxt == IPPROTO_IPV6) { if (m->m_pkthdr.len < off + sizeof(struct ip6_hdr)) { ipseclog((LOG_NOTICE, "ipsec6_tunnel_validate pkthdr %d off %d ip6hdr %zu", m->m_pkthdr.len, off, sizeof(struct ip6_hdr))); return 0; } } else { ipseclog((LOG_NOTICE, "ipsec6_tunnel_validate invalid nxt(%u) protocol", nxt)); return 0; } /* do not decapsulate if the SA is for transport mode only */ if (sav->sah->saidx.mode == IPSEC_MODE_TRANSPORT) { return 0; } oip6 = mtod(m, struct ip6_hdr *); /* AF_INET should be supported, but at this moment we don't. */ sin6 = (struct sockaddr_in6 *)&sav->sah->saidx.dst; if (sin6->sin6_family != AF_INET6) { return 0; } if (!IN6_ARE_ADDR_EQUAL(&oip6->ip6_dst, &sin6->sin6_addr)) { return 0; } if (sav->sah->ipsec_if != NULL) { // the ipsec interface SAs don't have a policies. if (nxt == IPPROTO_IPV4) { *ifamily = AF_INET; } else if (nxt == IPPROTO_IPV6) { *ifamily = AF_INET6; } else { return 0; } return 1; } /* XXX slow */ bzero(&osrc, sizeof(osrc)); bzero(&odst, sizeof(odst)); osrc.sin6_family = odst.sin6_family = AF_INET6; osrc.sin6_len = odst.sin6_len = sizeof(struct sockaddr_in6); osrc.sin6_addr = oip6->ip6_src; odst.sin6_addr = oip6->ip6_dst; /* * regarding to inner source address validation, see a long comment * in ipsec4_tunnel_validate. */ if (nxt == IPPROTO_IPV4) { bzero(&i4src, sizeof(struct sockaddr_in)); bzero(&i4dst, sizeof(struct sockaddr_in)); i4src.sin_family = i4dst.sin_family = *ifamily = AF_INET; i4src.sin_len = i4dst.sin_len = sizeof(struct sockaddr_in); m_copydata(m, off + offsetof(struct ip, ip_src), sizeof(i4src.sin_addr), (caddr_t)&i4src.sin_addr); m_copydata(m, off + offsetof(struct ip, ip_dst), sizeof(i4dst.sin_addr), (caddr_t)&i4dst.sin_addr); sp = key_gettunnel((struct sockaddr *)&osrc, (struct sockaddr *)&odst, (struct sockaddr *)&i4src, (struct sockaddr *)&i4dst); } else if (nxt == IPPROTO_IPV6) { bzero(&i6src, sizeof(struct sockaddr_in6)); bzero(&i6dst, sizeof(struct sockaddr_in6)); i6src.sin6_family = i6dst.sin6_family = *ifamily = AF_INET6; i6src.sin6_len = i6dst.sin6_len = sizeof(struct sockaddr_in6); m_copydata(m, off + offsetof(struct ip6_hdr, ip6_src), sizeof(i6src.sin6_addr), (caddr_t)&i6src.sin6_addr); m_copydata(m, off + offsetof(struct ip6_hdr, ip6_dst), sizeof(i6dst.sin6_addr), (caddr_t)&i6dst.sin6_addr); sp = key_gettunnel((struct sockaddr *)&osrc, (struct sockaddr *)&odst, (struct sockaddr *)&i6src, (struct sockaddr *)&i6dst); } else { return 0; /* unsupported family */ } /* * when there is no suitable inbound policy for the packet of the ipsec * tunnel mode, the kernel never decapsulate the tunneled packet * as the ipsec tunnel mode even when the system wide policy is "none". * then the kernel leaves the generic tunnel module to process this * packet. if there is no rule of the generic tunnel, the packet * is rejected and the statistics will be counted up. */ if (!sp) { return 0; } key_freesp(sp, KEY_SADB_UNLOCKED); return 1; } /* * Make a mbuf chain for encryption. * If the original mbuf chain contains a mbuf with a cluster, * allocate a new cluster and copy the data to the new cluster. * XXX: this hack is inefficient, but is necessary to handle cases * of TCP retransmission... */ struct mbuf * ipsec_copypkt(struct mbuf *m) { struct mbuf *n, **mpp, *mnew; for (n = m, mpp = &m; n; n = n->m_next) { if (n->m_flags & M_EXT) { /* * Make a copy only if there are more than one references * to the cluster. * XXX: is this approach effective? */ if ( m_get_ext_free(n) != NULL || m_mclhasreference(n) ) { int remain, copied; struct mbuf *mm; if (n->m_flags & M_PKTHDR) { MGETHDR(mnew, M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (mnew == NULL) { goto fail; } M_COPY_PKTHDR(mnew, n); } else { MGET(mnew, M_DONTWAIT, MT_DATA); if (mnew == NULL) { goto fail; } } mnew->m_len = 0; mm = mnew; /* * Copy data. If we don't have enough space to * store the whole data, allocate a cluster * or additional mbufs. * XXX: we don't use m_copyback(), since the * function does not use clusters and thus is * inefficient. */ remain = n->m_len; copied = 0; while (1) { int len; struct mbuf *mn; if (remain <= (mm->m_flags & M_PKTHDR ? MHLEN : MLEN)) { len = remain; } else { /* allocate a cluster */ MCLGET(mm, M_DONTWAIT); if (!(mm->m_flags & M_EXT)) { m_free(mm); goto fail; } len = remain < MCLBYTES ? remain : MCLBYTES; } bcopy(n->m_data + copied, mm->m_data, len); copied += len; remain -= len; mm->m_len = len; if (remain <= 0) { /* completed? */ break; } /* need another mbuf */ MGETHDR(mn, M_DONTWAIT, MT_HEADER); /* XXXMAC: tags copied next time in loop? */ if (mn == NULL) { goto fail; } mn->m_pkthdr.rcvif = NULL; mm->m_next = mn; mm = mn; } /* adjust chain */ mm->m_next = m_free(n); n = mm; *mpp = mnew; mpp = &n->m_next; continue; } } *mpp = n; mpp = &n->m_next; } return m; fail: m_freem(m); return NULL; } /* * Tags are allocated as mbufs for now, since our minimum size is MLEN, we * should make use of up to that much space. */ #define IPSEC_TAG_HEADER \ struct ipsec_tag { struct socket *socket; u_int32_t history_count; struct ipsec_history history[]; #if __arm__ && (__BIGGEST_ALIGNMENT__ > 4) /* For the newer ARMv7k ABI where 64-bit types are 64-bit aligned, but pointers * are 32-bit: * Aligning to 64-bit since we case to m_tag which is 64-bit aligned. */ } __attribute__ ((aligned(8))); #else }; #endif #define IPSEC_TAG_SIZE (MLEN - sizeof(struct m_tag)) #define IPSEC_TAG_HDR_SIZE (offsetof(struct ipsec_tag, history[0])) #define IPSEC_HISTORY_MAX ((IPSEC_TAG_SIZE - IPSEC_TAG_HDR_SIZE) / \ sizeof(struct ipsec_history)) static struct ipsec_tag * ipsec_addaux( struct mbuf *m) { struct m_tag *tag; /* Check if the tag already exists */ tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPSEC, NULL); if (tag == NULL) { struct ipsec_tag *itag; /* Allocate a tag */ tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPSEC, IPSEC_TAG_SIZE, M_DONTWAIT, m); if (tag) { itag = (struct ipsec_tag*)(tag + 1); itag->socket = 0; itag->history_count = 0; m_tag_prepend(m, tag); } } return tag ? (struct ipsec_tag*)(tag + 1) : NULL; } static struct ipsec_tag * ipsec_findaux( struct mbuf *m) { struct m_tag *tag; tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPSEC, NULL); return tag ? (struct ipsec_tag*)(tag + 1) : NULL; } void ipsec_delaux( struct mbuf *m) { struct m_tag *tag; tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPSEC, NULL); if (tag) { m_tag_delete(m, tag); } } /* if the aux buffer is unnecessary, nuke it. */ static void ipsec_optaux( struct mbuf *m, struct ipsec_tag *itag) { if (itag && itag->socket == NULL && itag->history_count == 0) { m_tag_delete(m, ((struct m_tag*)itag) - 1); } } int ipsec_setsocket(struct mbuf *m, struct socket *so) { struct ipsec_tag *tag; /* if so == NULL, don't insist on getting the aux mbuf */ if (so) { tag = ipsec_addaux(m); if (!tag) { return ENOBUFS; } } else { tag = ipsec_findaux(m); } if (tag) { tag->socket = so; ipsec_optaux(m, tag); } return 0; } struct socket * ipsec_getsocket(struct mbuf *m) { struct ipsec_tag *itag; itag = ipsec_findaux(m); if (itag) { return itag->socket; } else { return NULL; } } int ipsec_addhist( struct mbuf *m, int proto, u_int32_t spi) { struct ipsec_tag *itag; struct ipsec_history *p; itag = ipsec_addaux(m); if (!itag) { return ENOBUFS; } if (itag->history_count == IPSEC_HISTORY_MAX) { return ENOSPC; /* XXX */ } p = &itag->history[itag->history_count]; itag->history_count++; bzero(p, sizeof(*p)); p->ih_proto = proto; p->ih_spi = spi; return 0; } struct ipsec_history * ipsec_gethist( struct mbuf *m, int *lenp) { struct ipsec_tag *itag; itag = ipsec_findaux(m); if (!itag) { return NULL; } if (itag->history_count == 0) { return NULL; } if (lenp) { *lenp = (int)(itag->history_count * sizeof(struct ipsec_history)); } return itag->history; } void ipsec_clearhist( struct mbuf *m) { struct ipsec_tag *itag; itag = ipsec_findaux(m); if (itag) { itag->history_count = 0; } ipsec_optaux(m, itag); } __private_extern__ boolean_t ipsec_send_natt_keepalive( struct secasvar *sav) { struct mbuf *m = NULL; int error = 0; int keepalive_interval = natt_keepalive_interval; LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_NOTOWNED); lck_mtx_lock(sadb_mutex); if (((esp_udp_encap_port & 0xFFFF) == 0 && sav->natt_encapsulated_src_port == 0) || sav->remote_ike_port == 0) { lck_mtx_unlock(sadb_mutex); return FALSE; } if (sav->natt_interval != 0) { keepalive_interval = (int)sav->natt_interval; } // natt timestamp may have changed... reverify if ((natt_now - sav->natt_last_activity) < keepalive_interval) { lck_mtx_unlock(sadb_mutex); return FALSE; } if (sav->flags & SADB_X_EXT_ESP_KEEPALIVE) { lck_mtx_unlock(sadb_mutex); return FALSE; // don't send these from the kernel } lck_mtx_unlock(sadb_mutex); m = m_gethdr(M_NOWAIT, MT_DATA); if (m == NULL) { return FALSE; } lck_mtx_lock(sadb_mutex); if (sav->sah->saidx.dst.ss_family == AF_INET) { struct ip_out_args ipoa = {}; struct route ro = {}; ipoa.ipoa_boundif = IFSCOPE_NONE; ipoa.ipoa_flags = IPOAF_SELECT_SRCIF; ipoa.ipoa_sotc = SO_TC_UNSPEC; ipoa.ipoa_netsvctype = _NET_SERVICE_TYPE_UNSPEC; struct ip *ip = (__typeof__(ip))m_mtod(m); /* * Type 2: a UDP packet complete with IP header. * We must do this because UDP output requires * an inpcb which we don't have. UDP packet * contains one byte payload. The byte is set * to 0xFF. */ struct udphdr *uh = (__typeof__(uh))(void *)((char *)m_mtod(m) + sizeof(*ip)); m->m_len = sizeof(struct udpiphdr) + 1; bzero(m_mtod(m), m->m_len); m->m_pkthdr.len = m->m_len; ip->ip_len = (u_short)m->m_len; ip->ip_ttl = (u_char)ip_defttl; ip->ip_p = IPPROTO_UDP; if (sav->sah->dir != IPSEC_DIR_INBOUND) { ip->ip_src = ((struct sockaddr_in*)&sav->sah->saidx.src)->sin_addr; ip->ip_dst = ((struct sockaddr_in*)&sav->sah->saidx.dst)->sin_addr; } else { ip->ip_src = ((struct sockaddr_in*)&sav->sah->saidx.dst)->sin_addr; ip->ip_dst = ((struct sockaddr_in*)&sav->sah->saidx.src)->sin_addr; } if (sav->natt_encapsulated_src_port != 0) { uh->uh_sport = (u_short)sav->natt_encapsulated_src_port; } else { uh->uh_sport = htons((u_short)esp_udp_encap_port); } uh->uh_sport = htons((u_short)esp_udp_encap_port); uh->uh_dport = htons(sav->remote_ike_port); uh->uh_ulen = htons(1 + sizeof(*uh)); uh->uh_sum = 0; *(u_int8_t*)((char*)m_mtod(m) + sizeof(*ip) + sizeof(*uh)) = 0xFF; if (ROUTE_UNUSABLE(&sav->sah->sa_route) || rt_key(sav->sah->sa_route.ro_rt)->sa_family != AF_INET) { ROUTE_RELEASE(&sav->sah->sa_route); } route_copyout(&ro, (struct route *)&sav->sah->sa_route, sizeof(struct route)); lck_mtx_unlock(sadb_mutex); necp_mark_packet_as_keepalive(m, TRUE); error = ip_output(m, NULL, &ro, IP_OUTARGS | IP_NOIPSEC, NULL, &ipoa); lck_mtx_lock(sadb_mutex); route_copyin(&ro, (struct route *)&sav->sah->sa_route, sizeof(struct route)); } else if (sav->sah->saidx.dst.ss_family == AF_INET6) { struct ip6_out_args ip6oa = {}; struct route_in6 ro6 = {}; ip6oa.ip6oa_flowadv.code = 0; ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR; if (sav->sah->outgoing_if) { ip6oa.ip6oa_boundif = sav->sah->outgoing_if; ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; } struct ip6_hdr *ip6 = (__typeof__(ip6))m_mtod(m); /* * Type 2: a UDP packet complete with IPv6 header. * We must do this because UDP output requires * an inpcb which we don't have. UDP packet * contains one byte payload. The byte is set * to 0xFF. */ struct udphdr *uh = (__typeof__(uh))(void *)((char *)m_mtod(m) + sizeof(*ip6)); m->m_len = sizeof(struct udphdr) + sizeof(struct ip6_hdr) + 1; bzero(m_mtod(m), m->m_len); m->m_pkthdr.len = m->m_len; ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; ip6->ip6_nxt = IPPROTO_UDP; ip6->ip6_hlim = (u_int8_t)ip6_defhlim; ip6->ip6_plen = htons(sizeof(struct udphdr) + 1); if (sav->sah->dir != IPSEC_DIR_INBOUND) { ip6->ip6_src = ((struct sockaddr_in6 *)&sav->sah->saidx.src)->sin6_addr; ip6->ip6_dst = ((struct sockaddr_in6 *)&sav->sah->saidx.dst)->sin6_addr; } else { ip6->ip6_src = ((struct sockaddr_in6 *)&sav->sah->saidx.dst)->sin6_addr; ip6->ip6_dst = ((struct sockaddr_in6 *)&sav->sah->saidx.src)->sin6_addr; } if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) { ip6->ip6_src.s6_addr16[1] = 0; } if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) { ip6->ip6_dst.s6_addr16[1] = 0; } if (sav->natt_encapsulated_src_port != 0) { uh->uh_sport = (u_short)sav->natt_encapsulated_src_port; } else { uh->uh_sport = htons((u_short)esp_udp_encap_port); } uh->uh_dport = htons(sav->remote_ike_port); uh->uh_ulen = htons(1 + sizeof(*uh)); *(u_int8_t*)((char*)m_mtod(m) + sizeof(*ip6) + sizeof(*uh)) = 0xFF; uh->uh_sum = in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst, htonl(ntohs(uh->uh_ulen) + IPPROTO_UDP)); m->m_pkthdr.csum_flags = (CSUM_UDPIPV6 | CSUM_ZERO_INVERT); m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); if (ROUTE_UNUSABLE(&sav->sah->sa_route) || rt_key(sav->sah->sa_route.ro_rt)->sa_family != AF_INET6) { ROUTE_RELEASE(&sav->sah->sa_route); } route_copyout((struct route *)&ro6, (struct route *)&sav->sah->sa_route, sizeof(struct route_in6)); lck_mtx_unlock(sadb_mutex); necp_mark_packet_as_keepalive(m, TRUE); error = ip6_output(m, NULL, &ro6, IPV6_OUTARGS, NULL, NULL, &ip6oa); lck_mtx_lock(sadb_mutex); route_copyin((struct route *)&ro6, (struct route *)&sav->sah->sa_route, sizeof(struct route_in6)); } else { ipseclog((LOG_ERR, "nat keepalive: invalid address family %u\n", sav->sah->saidx.dst.ss_family)); lck_mtx_unlock(sadb_mutex); m_freem(m); return FALSE; } if (error == 0) { sav->natt_last_activity = natt_now; lck_mtx_unlock(sadb_mutex); return TRUE; } lck_mtx_unlock(sadb_mutex); return FALSE; } __private_extern__ bool ipsec_fill_offload_frame(ifnet_t ifp, struct secasvar *sav, struct ifnet_keepalive_offload_frame *frame, size_t frame_data_offset) { u_int8_t *data = NULL; struct ip *ip = NULL; struct udphdr *uh = NULL; if (sav == NULL || sav->sah == NULL || frame == NULL || (ifp != NULL && ifp->if_index != sav->sah->outgoing_if) || sav->sah->saidx.dst.ss_family != AF_INET || !(sav->flags & SADB_X_EXT_NATT) || !(sav->flags & SADB_X_EXT_NATT_KEEPALIVE) || !(sav->flags & SADB_X_EXT_NATT_KEEPALIVE_OFFLOAD) || sav->flags & SADB_X_EXT_ESP_KEEPALIVE || ((esp_udp_encap_port & 0xFFFF) == 0 && sav->natt_encapsulated_src_port == 0) || sav->remote_ike_port == 0 || (natt_keepalive_interval == 0 && sav->natt_interval == 0 && sav->natt_offload_interval == 0)) { /* SA is not eligible for keepalive offload on this interface */ return FALSE; } if (frame_data_offset + sizeof(struct udpiphdr) + 1 > IFNET_KEEPALIVE_OFFLOAD_FRAME_DATA_SIZE) { /* Not enough room in this data frame */ return FALSE; } data = frame->data; ip = (__typeof__(ip))(void *)(data + frame_data_offset); uh = (__typeof__(uh))(void *)(data + frame_data_offset + sizeof(*ip)); frame->length = (u_int8_t)(frame_data_offset + sizeof(struct udpiphdr) + 1); frame->type = IFNET_KEEPALIVE_OFFLOAD_FRAME_IPSEC; frame->ether_type = IFNET_KEEPALIVE_OFFLOAD_FRAME_ETHERTYPE_IPV4; bzero(data, IFNET_KEEPALIVE_OFFLOAD_FRAME_DATA_SIZE); ip->ip_v = IPVERSION; ip->ip_hl = sizeof(struct ip) >> 2; ip->ip_off &= htons(~IP_OFFMASK); ip->ip_off &= htons(~IP_MF); switch (ip4_ipsec_dfbit) { case 0: /* clear DF bit */ ip->ip_off &= htons(~IP_DF); break; case 1: /* set DF bit */ ip->ip_off |= htons(IP_DF); break; default: /* copy DF bit */ break; } ip->ip_len = htons(sizeof(struct udpiphdr) + 1); if (rfc6864 && IP_OFF_IS_ATOMIC(htons(ip->ip_off))) { ip->ip_id = 0; } else { ip->ip_id = ip_randomid(); } ip->ip_ttl = (u_char)ip_defttl; ip->ip_p = IPPROTO_UDP; ip->ip_sum = 0; if (sav->sah->dir != IPSEC_DIR_INBOUND) { ip->ip_src = ((struct sockaddr_in*)&sav->sah->saidx.src)->sin_addr; ip->ip_dst = ((struct sockaddr_in*)&sav->sah->saidx.dst)->sin_addr; } else { ip->ip_src = ((struct sockaddr_in*)&sav->sah->saidx.dst)->sin_addr; ip->ip_dst = ((struct sockaddr_in*)&sav->sah->saidx.src)->sin_addr; } ip->ip_sum = in_cksum_hdr_opt(ip); /* Fill out the UDP header */ if (sav->natt_encapsulated_src_port != 0) { uh->uh_sport = (u_short)sav->natt_encapsulated_src_port; } else { uh->uh_sport = htons((u_short)esp_udp_encap_port); } uh->uh_dport = htons(sav->remote_ike_port); uh->uh_ulen = htons(1 + sizeof(*uh)); uh->uh_sum = 0; *(u_int8_t*)(data + frame_data_offset + sizeof(*ip) + sizeof(*uh)) = 0xFF; if (sav->natt_offload_interval != 0) { frame->interval = sav->natt_offload_interval; } else if (sav->natt_interval != 0) { frame->interval = sav->natt_interval; } else { frame->interval = (u_int16_t)natt_keepalive_interval; } return TRUE; } static int sysctl_ipsec_wake_packet SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg1, arg2) if (req->newptr != USER_ADDR_NULL) { ipseclog((LOG_ERR, "ipsec: invalid parameters")); return EINVAL; } struct proc *p = current_proc(); if (p != NULL) { uid_t uid = kauth_cred_getuid(kauth_cred_get()); if (uid != 0 && priv_check_cred(kauth_cred_get(), PRIV_NET_PRIVILEGED_IPSEC_WAKE_PACKET, 0) != 0) { ipseclog((LOG_ERR, "process does not hold necessary entitlement to get ipsec wake packet")); return EPERM; } int result = sysctl_io_opaque(req, &ipsec_wake_pkt, sizeof(ipsec_wake_pkt), NULL); ipseclog((LOG_NOTICE, "%s: uuid %s spi %u seq %u len %u result %d", __func__, ipsec_wake_pkt.wake_uuid, ipsec_wake_pkt.wake_pkt_spi, ipsec_wake_pkt.wake_pkt_seq, ipsec_wake_pkt.wake_pkt_len, result)); return result; } return EINVAL; } SYSCTL_PROC(_net_link_generic_system, OID_AUTO, ipsec_wake_pkt, CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, &sysctl_ipsec_wake_packet, "S,ipsec wake packet", ""); void ipsec_save_wake_packet(struct mbuf *wake_mbuf, u_int32_t spi, u_int32_t seq) { if (wake_mbuf == NULL) { ipseclog((LOG_ERR, "ipsec: bad wake packet")); return; } lck_mtx_lock(sadb_mutex); if (__probable(!ipsec_save_wake_pkt)) { goto done; } u_int16_t max_len = (wake_mbuf->m_pkthdr.len > IPSEC_MAX_WAKE_PKT_LEN) ? IPSEC_MAX_WAKE_PKT_LEN : (u_int16_t)wake_mbuf->m_pkthdr.len; m_copydata(wake_mbuf, 0, max_len, (void *)ipsec_wake_pkt.wake_pkt); ipsec_wake_pkt.wake_pkt_len = max_len; ipsec_wake_pkt.wake_pkt_spi = spi; ipsec_wake_pkt.wake_pkt_seq = seq; ipseclog((LOG_NOTICE, "%s: uuid %s spi %u seq %u len %u", __func__, ipsec_wake_pkt.wake_uuid, ipsec_wake_pkt.wake_pkt_spi, ipsec_wake_pkt.wake_pkt_seq, ipsec_wake_pkt.wake_pkt_len)); struct kev_msg ev_msg; bzero(&ev_msg, sizeof(ev_msg)); ev_msg.vendor_code = KEV_VENDOR_APPLE; ev_msg.kev_class = KEV_NETWORK_CLASS; ev_msg.kev_subclass = KEV_IPSEC_SUBCLASS; ev_msg.event_code = KEV_IPSEC_WAKE_PACKET; struct ipsec_wake_pkt_event_data event_data; strlcpy(event_data.wake_uuid, ipsec_wake_pkt.wake_uuid, sizeof(event_data.wake_uuid)); ev_msg.dv[0].data_ptr = &event_data; ev_msg.dv[0].data_length = sizeof(event_data); int result = kev_post_msg(&ev_msg); if (result != 0) { os_log_error(OS_LOG_DEFAULT, "%s: kev_post_msg() failed with error %d for wake uuid %s", __func__, result, ipsec_wake_pkt.wake_uuid); } ipsec_save_wake_pkt = false; done: lck_mtx_unlock(sadb_mutex); return; } static void ipsec_get_local_ports(void) { errno_t error; ifnet_t *ifp_list; uint32_t count, i; static uint8_t port_bitmap[bitstr_size(IP_PORTRANGE_SIZE)]; error = ifnet_list_get_all(IFNET_FAMILY_IPSEC, &ifp_list, &count); if (error != 0) { os_log_error(OS_LOG_DEFAULT, "%s: ifnet_list_get_all() failed %d", __func__, error); return; } for (i = 0; i < count; i++) { ifnet_t ifp = ifp_list[i]; /* * Get all the TCP and UDP ports for IPv4 and IPv6 */ error = ifnet_get_local_ports_extended(ifp, PF_UNSPEC, IFNET_GET_LOCAL_PORTS_WILDCARDOK | IFNET_GET_LOCAL_PORTS_NOWAKEUPOK | IFNET_GET_LOCAL_PORTS_ANYTCPSTATEOK, port_bitmap); if (error != 0) { os_log_error(OS_LOG_DEFAULT, "%s: ifnet_get_local_ports_extended(%s) failed %d", __func__, if_name(ifp), error); } } ifnet_list_free(ifp_list); } static IOReturn ipsec_sleep_wake_handler(void *target, void *refCon, UInt32 messageType, void *provider, void *messageArgument, vm_size_t argSize) { #pragma unused(target, refCon, provider, messageArgument, argSize) switch (messageType) { case kIOMessageSystemWillSleep: { ipsec_get_local_ports(); ipsec_save_wake_pkt = false; memset(&ipsec_wake_pkt, 0, sizeof(ipsec_wake_pkt)); IOPMCopySleepWakeUUIDKey(ipsec_wake_pkt.wake_uuid, sizeof(ipsec_wake_pkt.wake_uuid)); ipseclog((LOG_NOTICE, "ipsec: system will sleep, uuid: %s", ipsec_wake_pkt.wake_uuid)); break; } case kIOMessageSystemHasPoweredOn: { char wake_reason[128] = {0}; size_t size = sizeof(wake_reason); if (kernel_sysctlbyname("kern.wakereason", wake_reason, &size, NULL, 0) == 0) { if (strnstr(wake_reason, "wlan", size) == 0 || strnstr(wake_reason, "WL.OutboxNotEmpty", size) == 0 || strnstr(wake_reason, "baseband", size) == 0 || strnstr(wake_reason, "bluetooth", size) == 0 || strnstr(wake_reason, "BT.OutboxNotEmpty", size) == 0) { ipsec_save_wake_pkt = true; ipseclog((LOG_NOTICE, "ipsec: system has powered on, uuid: %s reason %s", ipsec_wake_pkt.wake_uuid, wake_reason)); } } break; } default: break; } return IOPMAckImplied; } void ipsec_monitor_sleep_wake(void) { LCK_MTX_ASSERT(sadb_mutex, LCK_MTX_ASSERT_OWNED); if (sleep_wake_handle == NULL) { sleep_wake_handle = registerSleepWakeInterest(ipsec_sleep_wake_handler, NULL, NULL); if (sleep_wake_handle != NULL) { ipseclog((LOG_INFO, "ipsec: monitoring sleep wake")); } } } |