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4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 | /* * Copyright (c) 2000-2015 Apple Inc. 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@ */ /* * Copyright (c) 1982, 1986, 1989, 1990, 1993 * The Regents of the University of California. All rights reserved. * * sendfile(2) and related extensions: * Copyright (c) 1998, David Greenman. 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. * * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94 */ /* * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce * support for mandatory and extensible security protections. This notice * is included in support of clause 2.2 (b) of the Apple Public License, * Version 2.0. */ #include <sys/cdefs.h> #include <sys/param.h> #include <sys/systm.h> #include <sys/filedesc.h> #include <sys/proc_internal.h> #include <sys/file_internal.h> #include <sys/vnode_internal.h> #include <sys/malloc.h> #include <sys/mcache.h> #include <sys/mbuf.h> #include <kern/locks.h> #include <sys/domain.h> #include <sys/protosw.h> #include <sys/signalvar.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/kernel.h> #include <sys/uio_internal.h> #include <sys/kauth.h> #include <kern/task.h> #include <sys/priv.h> #include <sys/sysctl.h> #include <sys/sys_domain.h> #include <sys/types.h> #include <security/audit/audit.h> #include <sys/kdebug.h> #include <sys/sysproto.h> #include <netinet/in.h> #include <net/route.h> #include <netinet/in_pcb.h> #include <os/log.h> #include <os/ptrtools.h> #include <os/log.h> #if CONFIG_MACF_SOCKET_SUBSET #include <security/mac_framework.h> #endif /* MAC_SOCKET_SUBSET */ #define f_flag fp_glob->fg_flag #define f_ops fp_glob->fg_ops #define DBG_LAYER_IN_BEG NETDBG_CODE(DBG_NETSOCK, 0) #define DBG_LAYER_IN_END NETDBG_CODE(DBG_NETSOCK, 2) #define DBG_LAYER_OUT_BEG NETDBG_CODE(DBG_NETSOCK, 1) #define DBG_LAYER_OUT_END NETDBG_CODE(DBG_NETSOCK, 3) #define DBG_FNC_SENDMSG NETDBG_CODE(DBG_NETSOCK, (1 << 8) | 1) #define DBG_FNC_SENDTO NETDBG_CODE(DBG_NETSOCK, (2 << 8) | 1) #define DBG_FNC_SENDIT NETDBG_CODE(DBG_NETSOCK, (3 << 8) | 1) #define DBG_FNC_RECVFROM NETDBG_CODE(DBG_NETSOCK, (5 << 8)) #define DBG_FNC_RECVMSG NETDBG_CODE(DBG_NETSOCK, (6 << 8)) #define DBG_FNC_RECVIT NETDBG_CODE(DBG_NETSOCK, (7 << 8)) #define DBG_FNC_SENDFILE NETDBG_CODE(DBG_NETSOCK, (10 << 8)) #define DBG_FNC_SENDFILE_WAIT NETDBG_CODE(DBG_NETSOCK, ((10 << 8) | 1)) #define DBG_FNC_SENDFILE_READ NETDBG_CODE(DBG_NETSOCK, ((10 << 8) | 2)) #define DBG_FNC_SENDFILE_SEND NETDBG_CODE(DBG_NETSOCK, ((10 << 8) | 3)) #define DBG_FNC_SENDMSG_X NETDBG_CODE(DBG_NETSOCK, (11 << 8)) #define DBG_FNC_RECVMSG_X NETDBG_CODE(DBG_NETSOCK, (12 << 8)) /* Forward declarations for referenced types */ __CCT_DECLARE_CONSTRAINED_PTR_TYPE(void, void, __CCT_PTR); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(uint8_t, uint8_t, __CCT_PTR); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(int32_t, int32, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(int, int, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(user_ssize_t, user_ssize, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(unsigned int, uint, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(sae_connid_t, sae_connid, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(socklen_t, socklen, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(struct setsockopt_args, setsockopt_args, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(struct connectx_args, connectx_args, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(struct disconnectx_args, disconnectx_args, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(struct cmsghdr, cmsghdr, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(struct timeval, timeval, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(struct user64_timeval, user64_timeval, __CCT_REF); __CCT_DECLARE_CONSTRAINED_PTR_TYPE(struct user32_timeval, user32_timeval, __CCT_REF); static int sendit(proc_ref_t, socket_ref_t, user_msghdr_ref_t, uio_t, int, int32_ref_t ); static int recvit(proc_ref_t, int, user_msghdr_ref_t, uio_t, user_addr_t, int32_ref_t); static int connectit(socket_ref_t, sockaddr_ref_t); static int getsockaddr(socket_ref_t, sockaddr_ref_ref_t, user_addr_t, size_t, boolean_t); static int getsockaddr_s(socket_ref_t, sockaddr_storage_ref_t, user_addr_t, size_t, boolean_t); #if SENDFILE static void alloc_sendpkt(int, size_t, uint_ref_t, mbuf_ref_ref_t, boolean_t); #endif /* SENDFILE */ static int connectx_nocancel(proc_ref_t, connectx_args_ref_t, int_ref_t); static int connectitx(socket_ref_t, sockaddr_ref_t, sockaddr_ref_t, proc_ref_t, uint32_t, sae_associd_t, sae_connid_ref_t, uio_t, unsigned int, user_ssize_ref_t); static int disconnectx_nocancel(proc_ref_t, disconnectx_args_ref_t, int_ref_t); static int socket_common(proc_ref_t, int, int, int, pid_t, int32_ref_t, int); #if DEBUG || DEVELOPMENT static int internalize_user_msghdr_array(const void_ptr_t, int, int, u_int count, user_msghdr_x_ptr_t, uio_ref_ptr_t); static void externalize_user_msghdr_array(void_ptr_t, int, int, u_int count, const user_msghdr_x_ptr_t, uio_ref_ptr_t); static void free_uio_array(uio_ref_ptr_t, u_int count); static boolean_t uio_array_is_valid(uio_ref_ptr_t, u_int count); #endif /* DEBUG || DEVELOPMENT */ static int internalize_recv_msghdr_array(const void_ptr_t, int, int, u_int count, user_msghdr_x_ptr_t, recv_msg_elem_ptr_t); static u_int externalize_recv_msghdr_array(proc_ref_t, socket_ref_t, void_ptr_t, u_int count, user_msghdr_x_ptr_t, recv_msg_elem_ptr_t, int_ref_t); static recv_msg_elem_ptr_t alloc_recv_msg_array(u_int count); static int recv_msg_array_is_valid(recv_msg_elem_ptr_t, u_int count); static void free_recv_msg_array(recv_msg_elem_ptr_t, u_int count); static int copyout_control(proc_ref_t, mbuf_ref_t, user_addr_t control, socklen_ref_t, int_ref_t, socket_ref_t); SYSCTL_DECL(_kern_ipc); #define SO_MAX_MSG_X_DEFAULT 256 static u_int somaxsendmsgx = SO_MAX_MSG_X_DEFAULT; SYSCTL_UINT(_kern_ipc, OID_AUTO, maxsendmsgx, CTLFLAG_RW | CTLFLAG_LOCKED, &somaxsendmsgx, 0, ""); static u_int somaxrecvmsgx = SO_MAX_MSG_X_DEFAULT; SYSCTL_UINT(_kern_ipc, OID_AUTO, maxrecvmsgx, CTLFLAG_RW | CTLFLAG_LOCKED, &somaxrecvmsgx, 0, ""); static u_int missingpktinfo = 0; SYSCTL_UINT(_kern_ipc, OID_AUTO, missingpktinfo, CTLFLAG_RD | CTLFLAG_LOCKED, &missingpktinfo, 0, ""); static int do_recvmsg_x_donttrunc = 0; SYSCTL_INT(_kern_ipc, OID_AUTO, do_recvmsg_x_donttrunc, CTLFLAG_RW | CTLFLAG_LOCKED, &do_recvmsg_x_donttrunc, 0, ""); #if DEBUG || DEVELOPMENT static int uipc_debug = 0; SYSCTL_INT(_kern_ipc, OID_AUTO, debug, CTLFLAG_RW | CTLFLAG_LOCKED, &uipc_debug, 0, ""); #define DEBUG_KERNEL_ADDRPERM(_v) (_v) #define DBG_PRINTF(...) if (uipc_debug != 0) { \ os_log(OS_LOG_DEFAULT, __VA_ARGS__); \ } #else #define DEBUG_KERNEL_ADDRPERM(_v) VM_KERNEL_ADDRPERM(_v) #define DBG_PRINTF(...) do { } while (0) #endif /* * Values for sendmsg_x_mode * 0: default * 1: sendit loop one at a time * 2: old implementation */ static u_int sendmsg_x_mode = 0; SYSCTL_UINT(_kern_ipc, OID_AUTO, sendmsg_x_mode, CTLFLAG_RW | CTLFLAG_LOCKED, &sendmsg_x_mode, 0, ""); /* * System call interface to the socket abstraction. */ extern const struct fileops socketops; /* * Returns: 0 Success * EACCES Mandatory Access Control failure * falloc:ENFILE * falloc:EMFILE * falloc:ENOMEM * socreate:EAFNOSUPPORT * socreate:EPROTOTYPE * socreate:EPROTONOSUPPORT * socreate:ENOBUFS * socreate:ENOMEM * socreate:??? [other protocol families, IPSEC] */ int socket(proc_ref_t p, struct socket_args *uap, int32_ref_t retval) { return socket_common(p, uap->domain, uap->type, uap->protocol, proc_selfpid(), retval, 0); } int socket_delegate(proc_ref_t p, struct socket_delegate_args *uap, int32_ref_t retval) { return socket_common(p, uap->domain, uap->type, uap->protocol, uap->epid, retval, 1); } static int socket_common(proc_ref_t p, int domain, int type, int protocol, pid_t epid, int32_ref_t retval, int delegate) { socket_ref_t so; fileproc_ref_t fp; int fd, error; AUDIT_ARG(socket, domain, type, protocol); #if CONFIG_MACF_SOCKET_SUBSET if ((error = mac_socket_check_create(kauth_cred_get(), domain, type, protocol)) != 0) { return error; } #endif /* MAC_SOCKET_SUBSET */ if (delegate) { error = priv_check_cred(kauth_cred_get(), PRIV_NET_PRIVILEGED_SOCKET_DELEGATE, 0); if (error) { return EACCES; } } error = falloc(p, &fp, &fd, vfs_context_current()); if (error) { return error; } fp->f_flag = FREAD | FWRITE; fp->f_ops = &socketops; if (delegate) { error = socreate_delegate(domain, &so, type, protocol, epid); } else { error = socreate(domain, &so, type, protocol); } if (error) { fp_free(p, fd, fp); } else { fp_set_data(fp, so); proc_fdlock(p); procfdtbl_releasefd(p, fd, NULL); if (ENTR_SHOULDTRACE) { KERNEL_ENERGYTRACE(kEnTrActKernSocket, DBG_FUNC_START, fd, 0, (int64_t)VM_KERNEL_ADDRPERM(so)); } fp_drop(p, fd, fp, 1); proc_fdunlock(p); *retval = fd; } return error; } /* * Returns: 0 Success * EDESTADDRREQ Destination address required * EBADF Bad file descriptor * EACCES Mandatory Access Control failure * file_socket:ENOTSOCK * file_socket:EBADF * getsockaddr:ENAMETOOLONG Filename too long * getsockaddr:EINVAL Invalid argument * getsockaddr:ENOMEM Not enough space * getsockaddr:EFAULT Bad address * sobindlock:??? */ /* ARGSUSED */ int bind(__unused proc_t p, struct bind_args *uap, __unused int32_ref_t retval) { struct sockaddr_storage ss; sockaddr_ref_t sa = NULL; socket_ref_t so; boolean_t want_free = TRUE; int error; AUDIT_ARG(fd, uap->s); error = file_socket(uap->s, &so); if (error != 0) { return error; } if (so == NULL) { error = EBADF; goto out; } if (uap->name == USER_ADDR_NULL) { error = EDESTADDRREQ; goto out; } if (uap->namelen > sizeof(ss)) { error = getsockaddr(so, &sa, uap->name, uap->namelen, TRUE); } else { error = getsockaddr_s(so, &ss, uap->name, uap->namelen, TRUE); if (error == 0) { sa = (sockaddr_ref_t)&ss; want_free = FALSE; } } if (error != 0) { goto out; } AUDIT_ARG(sockaddr, vfs_context_cwd(vfs_context_current()), sa); #if CONFIG_MACF_SOCKET_SUBSET if ((sa != NULL && sa->sa_family == AF_SYSTEM) || (error = mac_socket_check_bind(kauth_cred_get(), so, sa)) == 0) { error = sobindlock(so, sa, 1); /* will lock socket */ } #else error = sobindlock(so, sa, 1); /* will lock socket */ #endif /* MAC_SOCKET_SUBSET */ if (want_free) { free_sockaddr(sa); } out: file_drop(uap->s); return error; } /* * Returns: 0 Success * EBADF * EACCES Mandatory Access Control failure * file_socket:ENOTSOCK * file_socket:EBADF * solisten:EINVAL * solisten:EOPNOTSUPP * solisten:??? */ int listen(__unused proc_ref_t p, struct listen_args *uap, __unused int32_ref_t retval) { int error; socket_ref_t so; AUDIT_ARG(fd, uap->s); error = file_socket(uap->s, &so); if (error) { return error; } if (so != NULL) #if CONFIG_MACF_SOCKET_SUBSET { error = mac_socket_check_listen(kauth_cred_get(), so); if (error == 0) { error = solisten(so, uap->backlog); } } #else { error = solisten(so, uap->backlog);} #endif /* MAC_SOCKET_SUBSET */ else { error = EBADF; } file_drop(uap->s); return error; } /* * Returns: fp_get_ftype:EBADF Bad file descriptor * fp_get_ftype:ENOTSOCK Socket operation on non-socket * :EFAULT Bad address on copyin/copyout * :EBADF Bad file descriptor * :EOPNOTSUPP Operation not supported on socket * :EINVAL Invalid argument * :EWOULDBLOCK Operation would block * :ECONNABORTED Connection aborted * :EINTR Interrupted function * :EACCES Mandatory Access Control failure * falloc:ENFILE Too many files open in system * falloc:EMFILE Too many open files * falloc:ENOMEM Not enough space * 0 Success */ int accept_nocancel(proc_ref_t p, struct accept_nocancel_args *uap, int32_ref_t retval) { fileproc_ref_t fp; sockaddr_ref_t sa = NULL; socklen_t namelen; int error; socket_ref_t head; socket_ref_t so = NULL; lck_mtx_t *mutex_held; int fd = uap->s; int newfd; unsigned int fflag; int dosocklock = 0; *retval = -1; AUDIT_ARG(fd, uap->s); if (uap->name) { error = copyin(uap->anamelen, (caddr_t)&namelen, sizeof(socklen_t)); if (error) { return error; } } error = fp_get_ftype(p, fd, DTYPE_SOCKET, ENOTSOCK, &fp); if (error) { return error; } head = (struct socket *)fp_get_data(fp); #if CONFIG_MACF_SOCKET_SUBSET if ((error = mac_socket_check_accept(kauth_cred_get(), head)) != 0) { goto out; } #endif /* MAC_SOCKET_SUBSET */ socket_lock(head, 1); if (head->so_proto->pr_getlock != NULL) { mutex_held = (*head->so_proto->pr_getlock)(head, PR_F_WILLUNLOCK); dosocklock = 1; } else { mutex_held = head->so_proto->pr_domain->dom_mtx; dosocklock = 0; } if ((head->so_options & SO_ACCEPTCONN) == 0) { if ((head->so_proto->pr_flags & PR_CONNREQUIRED) == 0) { error = EOPNOTSUPP; } else { /* POSIX: The socket is not accepting connections */ error = EINVAL; } socket_unlock(head, 1); goto out; } check_again: if ((head->so_state & SS_NBIO) && head->so_comp.tqh_first == NULL) { socket_unlock(head, 1); error = EWOULDBLOCK; goto out; } while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) { if (head->so_state & SS_CANTRCVMORE) { head->so_error = ECONNABORTED; break; } if (head->so_usecount < 1) { panic("accept: head=%p refcount=%d", head, head->so_usecount); } error = msleep((caddr_t)&head->so_timeo, mutex_held, PSOCK | PCATCH, "accept", 0); if (head->so_usecount < 1) { panic("accept: 2 head=%p refcount=%d", head, head->so_usecount); } if ((head->so_state & SS_DRAINING)) { error = ECONNABORTED; } if (error) { socket_unlock(head, 1); goto out; } } if (head->so_error) { error = head->so_error; head->so_error = 0; socket_unlock(head, 1); goto out; } /* * At this point we know that there is at least one connection * ready to be accepted. Remove it from the queue prior to * allocating the file descriptor for it since falloc() may * block allowing another process to accept the connection * instead. */ lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED); so_acquire_accept_list(head, NULL); if (TAILQ_EMPTY(&head->so_comp)) { so_release_accept_list(head); goto check_again; } so = TAILQ_FIRST(&head->so_comp); TAILQ_REMOVE(&head->so_comp, so, so_list); /* * Acquire the lock of the new connection * as we may be in the process of receiving * a packet that may change its so_state * (e.g.: a TCP FIN). */ if (dosocklock) { socket_lock(so, 0); } so->so_head = NULL; so->so_state &= ~SS_COMP; if (dosocklock) { socket_unlock(so, 0); } head->so_qlen--; so_release_accept_list(head); /* unlock head to avoid deadlock with select, keep a ref on head */ socket_unlock(head, 0); #if CONFIG_MACF_SOCKET_SUBSET /* * Pass the pre-accepted socket to the MAC framework. This is * cheaper than allocating a file descriptor for the socket, * calling the protocol accept callback, and possibly freeing * the file descriptor should the MAC check fails. */ if ((error = mac_socket_check_accepted(kauth_cred_get(), so)) != 0) { socket_lock(so, 1); so->so_state &= ~SS_NOFDREF; socket_unlock(so, 1); soclose(so); /* Drop reference on listening socket */ sodereference(head); goto out; } #endif /* MAC_SOCKET_SUBSET */ /* * Pass the pre-accepted socket to any interested socket filter(s). * Upon failure, the socket would have been closed by the callee. */ if (so->so_filt != NULL && (error = soacceptfilter(so, head)) != 0) { /* Drop reference on listening socket */ sodereference(head); /* Propagate socket filter's error code to the caller */ goto out; } fflag = fp->f_flag; error = falloc(p, &fp, &newfd, vfs_context_current()); if (error) { /* * Probably ran out of file descriptors. * * <rdar://problem/8554930> * Don't put this back on the socket like we used to, that * just causes the client to spin. Drop the socket. */ socket_lock(so, 1); so->so_state &= ~SS_NOFDREF; socket_unlock(so, 1); soclose(so); sodereference(head); goto out; } *retval = newfd; fp->f_flag = fflag; fp->f_ops = &socketops; fp_set_data(fp, so); socket_lock(head, 0); if (dosocklock) { socket_lock(so, 1); } /* Sync socket non-blocking/async state with file flags */ if (fp->f_flag & FNONBLOCK) { so->so_state |= SS_NBIO; } else { so->so_state &= ~SS_NBIO; } if (fp->f_flag & FASYNC) { so->so_state |= SS_ASYNC; so->so_rcv.sb_flags |= SB_ASYNC; so->so_snd.sb_flags |= SB_ASYNC; } else { so->so_state &= ~SS_ASYNC; so->so_rcv.sb_flags &= ~SB_ASYNC; so->so_snd.sb_flags &= ~SB_ASYNC; } (void) soacceptlock(so, &sa, 0); socket_unlock(head, 1); if (sa == NULL) { namelen = 0; if (uap->name) { goto gotnoname; } error = 0; goto releasefd; } AUDIT_ARG(sockaddr, vfs_context_cwd(vfs_context_current()), sa); if (uap->name) { socklen_t sa_len; /* save sa_len before it is destroyed */ sa_len = sa->sa_len; namelen = MIN(namelen, sa_len); error = copyout(sa, uap->name, namelen); if (!error) { /* return the actual, untruncated address length */ namelen = sa_len; } gotnoname: error = copyout((caddr_t)&namelen, uap->anamelen, sizeof(socklen_t)); } free_sockaddr(sa); releasefd: /* * If the socket has been marked as inactive by sosetdefunct(), * disallow further operations on it. */ if (so->so_flags & SOF_DEFUNCT) { sodefunct(current_proc(), so, SHUTDOWN_SOCKET_LEVEL_DISCONNECT_INTERNAL); } if (dosocklock) { socket_unlock(so, 1); } proc_fdlock(p); procfdtbl_releasefd(p, newfd, NULL); fp_drop(p, newfd, fp, 1); proc_fdunlock(p); out: if (error == 0 && ENTR_SHOULDTRACE) { KERNEL_ENERGYTRACE(kEnTrActKernSocket, DBG_FUNC_START, newfd, 0, (int64_t)VM_KERNEL_ADDRPERM(so)); } file_drop(fd); return error; } int accept(proc_ref_t p, struct accept_args *uap, int32_ref_t retval) { __pthread_testcancel(1); return accept_nocancel(p, (struct accept_nocancel_args *)uap, retval); } /* * Returns: 0 Success * EBADF Bad file descriptor * EALREADY Connection already in progress * EINPROGRESS Operation in progress * ECONNABORTED Connection aborted * EINTR Interrupted function * EACCES Mandatory Access Control failure * file_socket:ENOTSOCK * file_socket:EBADF * getsockaddr:ENAMETOOLONG Filename too long * getsockaddr:EINVAL Invalid argument * getsockaddr:ENOMEM Not enough space * getsockaddr:EFAULT Bad address * soconnectlock:EOPNOTSUPP * soconnectlock:EISCONN * soconnectlock:??? [depends on protocol, filters] * msleep:EINTR * * Imputed: so_error error may be set from so_error, which * may have been set by soconnectlock. */ /* ARGSUSED */ int connect(proc_ref_t p, struct connect_args *uap, int32_ref_t retval) { __pthread_testcancel(1); return connect_nocancel(p, (struct connect_nocancel_args *)uap, retval); } int connect_nocancel(proc_t p, struct connect_nocancel_args *uap, int32_ref_t retval) { #pragma unused(p, retval) socket_ref_t so; struct sockaddr_storage ss; sockaddr_ref_t sa = NULL; int error; int fd = uap->s; boolean_t dgram; AUDIT_ARG(fd, uap->s); error = file_socket(fd, &so); if (error != 0) { return error; } if (so == NULL) { error = EBADF; goto out; } /* * Ask getsockaddr{_s} to not translate AF_UNSPEC to AF_INET * if this is a datagram socket; translate for other types. */ dgram = (so->so_type == SOCK_DGRAM); /* Get socket address now before we obtain socket lock */ if (uap->namelen > sizeof(ss)) { error = getsockaddr(so, &sa, uap->name, uap->namelen, !dgram); } else { error = getsockaddr_s(so, &ss, uap->name, uap->namelen, !dgram); if (error == 0) { sa = (sockaddr_ref_t)&ss; } } if (error != 0) { goto out; } error = connectit(so, sa); if (sa != NULL && sa != SA(&ss)) { free_sockaddr(sa); } if (error == ERESTART) { error = EINTR; } out: file_drop(fd); return error; } static int connectx_nocancel(proc_ref_t p, connectx_args_ref_t uap, int_ref_t retval) { #pragma unused(p, retval) struct sockaddr_storage ss, sd; sockaddr_ref_t src = NULL, dst = NULL; socket_ref_t so; int error, error1, fd = uap->socket; boolean_t dgram; sae_connid_t cid = SAE_CONNID_ANY; struct user32_sa_endpoints ep32; struct user64_sa_endpoints ep64; struct user_sa_endpoints ep; user_ssize_t bytes_written = 0; struct user_iovec *iovp; uio_t auio = NULL; AUDIT_ARG(fd, uap->socket); error = file_socket(fd, &so); if (error != 0) { return error; } if (so == NULL) { error = EBADF; goto out; } if (uap->endpoints == USER_ADDR_NULL) { error = EINVAL; goto out; } if (IS_64BIT_PROCESS(p)) { error = copyin(uap->endpoints, (caddr_t)&ep64, sizeof(ep64)); if (error != 0) { goto out; } ep.sae_srcif = ep64.sae_srcif; ep.sae_srcaddr = (user_addr_t)ep64.sae_srcaddr; ep.sae_srcaddrlen = ep64.sae_srcaddrlen; ep.sae_dstaddr = (user_addr_t)ep64.sae_dstaddr; ep.sae_dstaddrlen = ep64.sae_dstaddrlen; } else { error = copyin(uap->endpoints, (caddr_t)&ep32, sizeof(ep32)); if (error != 0) { goto out; } ep.sae_srcif = ep32.sae_srcif; ep.sae_srcaddr = ep32.sae_srcaddr; ep.sae_srcaddrlen = ep32.sae_srcaddrlen; ep.sae_dstaddr = ep32.sae_dstaddr; ep.sae_dstaddrlen = ep32.sae_dstaddrlen; } /* * Ask getsockaddr{_s} to not translate AF_UNSPEC to AF_INET * if this is a datagram socket; translate for other types. */ dgram = (so->so_type == SOCK_DGRAM); /* Get socket address now before we obtain socket lock */ if (ep.sae_srcaddr != USER_ADDR_NULL) { if (ep.sae_srcaddrlen > sizeof(ss)) { error = getsockaddr(so, &src, ep.sae_srcaddr, ep.sae_srcaddrlen, dgram); } else { error = getsockaddr_s(so, &ss, ep.sae_srcaddr, ep.sae_srcaddrlen, dgram); if (error == 0) { src = (sockaddr_ref_t)&ss; } } if (error) { goto out; } } if (ep.sae_dstaddr == USER_ADDR_NULL) { error = EINVAL; goto out; } /* Get socket address now before we obtain socket lock */ if (ep.sae_dstaddrlen > sizeof(sd)) { error = getsockaddr(so, &dst, ep.sae_dstaddr, ep.sae_dstaddrlen, dgram); } else { error = getsockaddr_s(so, &sd, ep.sae_dstaddr, ep.sae_dstaddrlen, dgram); if (error == 0) { dst = (sockaddr_ref_t)&sd; } } if (error) { goto out; } VERIFY(dst != NULL); if (uap->iov != USER_ADDR_NULL) { /* Verify range before calling uio_create() */ if (uap->iovcnt <= 0 || uap->iovcnt > UIO_MAXIOV) { error = EINVAL; goto out; } if (uap->len == USER_ADDR_NULL) { error = EINVAL; goto out; } /* allocate a uio to hold the number of iovecs passed */ auio = uio_create(uap->iovcnt, 0, (IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32), UIO_WRITE); if (auio == NULL) { error = ENOMEM; goto out; } /* * get location of iovecs within the uio. * then copyin the iovecs from user space. */ iovp = uio_iovsaddr(auio); if (iovp == NULL) { error = ENOMEM; goto out; } error = copyin_user_iovec_array(uap->iov, IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32, uap->iovcnt, iovp); if (error != 0) { goto out; } /* finish setup of uio_t */ error = uio_calculateresid(auio); if (error != 0) { goto out; } } error = connectitx(so, src, dst, p, ep.sae_srcif, uap->associd, &cid, auio, uap->flags, &bytes_written); if (error == ERESTART) { error = EINTR; } if (uap->len != USER_ADDR_NULL) { if (IS_64BIT_PROCESS(p)) { error1 = copyout(&bytes_written, uap->len, sizeof(user64_size_t)); } else { error1 = copyout(&bytes_written, uap->len, sizeof(user32_size_t)); } /* give precedence to connectitx errors */ if ((error1 != 0) && (error == 0)) { error = error1; } } if (uap->connid != USER_ADDR_NULL) { error1 = copyout(&cid, uap->connid, sizeof(cid)); /* give precedence to connectitx errors */ if ((error1 != 0) && (error == 0)) { error = error1; } } out: file_drop(fd); if (auio != NULL) { uio_free(auio); } if (src != NULL && src != SA(&ss)) { free_sockaddr(src); } if (dst != NULL && dst != SA(&sd)) { free_sockaddr(dst); } return error; } int connectx(proc_ref_t p, struct connectx_args *uap, int *retval) { /* * Due to similiarity with a POSIX interface, define as * an unofficial cancellation point. */ __pthread_testcancel(1); return connectx_nocancel(p, uap, retval); } static int connectit(struct socket *so, sockaddr_ref_t sa) { int error; AUDIT_ARG(sockaddr, vfs_context_cwd(vfs_context_current()), sa); #if CONFIG_MACF_SOCKET_SUBSET if ((error = mac_socket_check_connect(kauth_cred_get(), so, sa)) != 0) { return error; } #endif /* MAC_SOCKET_SUBSET */ socket_lock(so, 1); if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { error = EALREADY; goto out; } error = soconnectlock(so, sa, 0); if (error != 0) { goto out; } if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { error = EINPROGRESS; goto out; } while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { lck_mtx_t *mutex_held; if (so->so_proto->pr_getlock != NULL) { mutex_held = (*so->so_proto->pr_getlock)(so, PR_F_WILLUNLOCK); } else { mutex_held = so->so_proto->pr_domain->dom_mtx; } error = msleep((caddr_t)&so->so_timeo, mutex_held, PSOCK | PCATCH, __func__, 0); if (so->so_state & SS_DRAINING) { error = ECONNABORTED; } if (error != 0) { break; } } if (error == 0) { error = so->so_error; so->so_error = 0; } out: socket_unlock(so, 1); return error; } static int connectitx(struct socket *so, sockaddr_ref_t src, sockaddr_ref_t dst, proc_ref_t p, uint32_t ifscope, sae_associd_t aid, sae_connid_t *pcid, uio_t auio, unsigned int flags, user_ssize_t *bytes_written) { int error; VERIFY(dst != NULL); AUDIT_ARG(sockaddr, vfs_context_cwd(vfs_context_current()), dst); #if CONFIG_MACF_SOCKET_SUBSET if ((error = mac_socket_check_connect(kauth_cred_get(), so, dst)) != 0) { return error; } if (auio != NULL) { if ((error = mac_socket_check_send(kauth_cred_get(), so, dst)) != 0) { return error; } } #endif /* MAC_SOCKET_SUBSET */ socket_lock(so, 1); if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { error = EALREADY; goto out; } error = soconnectxlocked(so, src, dst, p, ifscope, aid, pcid, flags, NULL, 0, auio, bytes_written); if (error != 0) { goto out; } /* * If, after the call to soconnectxlocked the flag is still set (in case * data has been queued and the connect() has actually been triggered, * it will have been unset by the transport), we exit immediately. There * is no reason to wait on any event. */ if (so->so_flags1 & SOF1_PRECONNECT_DATA) { error = 0; goto out; } if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { error = EINPROGRESS; goto out; } while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { lck_mtx_t *mutex_held; if (so->so_proto->pr_getlock != NULL) { mutex_held = (*so->so_proto->pr_getlock)(so, PR_F_WILLUNLOCK); } else { mutex_held = so->so_proto->pr_domain->dom_mtx; } error = msleep((caddr_t)&so->so_timeo, mutex_held, PSOCK | PCATCH, __func__, 0); if (so->so_state & SS_DRAINING) { error = ECONNABORTED; } if (error != 0) { break; } } if (error == 0) { error = so->so_error; so->so_error = 0; } out: socket_unlock(so, 1); return error; } int peeloff(proc_ref_t p, struct peeloff_args *uap, int *retval) { #pragma unused(p, uap, retval) /* * Due to similiarity with a POSIX interface, define as * an unofficial cancellation point. */ __pthread_testcancel(1); return 0; } int disconnectx(proc_ref_t p, struct disconnectx_args *uap, int *retval) { /* * Due to similiarity with a POSIX interface, define as * an unofficial cancellation point. */ __pthread_testcancel(1); return disconnectx_nocancel(p, uap, retval); } static int disconnectx_nocancel(proc_ref_t p, struct disconnectx_args *uap, int *retval) { #pragma unused(p, retval) socket_ref_t so; int fd = uap->s; int error; error = file_socket(fd, &so); if (error != 0) { return error; } if (so == NULL) { error = EBADF; goto out; } error = sodisconnectx(so, uap->aid, uap->cid); out: file_drop(fd); return error; } /* * Returns: 0 Success * socreate:EAFNOSUPPORT * socreate:EPROTOTYPE * socreate:EPROTONOSUPPORT * socreate:ENOBUFS * socreate:ENOMEM * socreate:EISCONN * socreate:??? [other protocol families, IPSEC] * falloc:ENFILE * falloc:EMFILE * falloc:ENOMEM * copyout:EFAULT * soconnect2:EINVAL * soconnect2:EPROTOTYPE * soconnect2:??? [other protocol families[ */ int socketpair(proc_ref_t p, struct socketpair_args *uap, __unused int32_ref_t retval) { fileproc_ref_t fp1, fp2; socket_ref_t so1, so2; int fd, error, sv[2]; AUDIT_ARG(socket, uap->domain, uap->type, uap->protocol); error = socreate(uap->domain, &so1, uap->type, uap->protocol); if (error) { return error; } error = socreate(uap->domain, &so2, uap->type, uap->protocol); if (error) { goto free1; } error = falloc(p, &fp1, &fd, vfs_context_current()); if (error) { goto free2; } fp1->f_flag = FREAD | FWRITE; fp1->f_ops = &socketops; fp_set_data(fp1, so1); sv[0] = fd; error = falloc(p, &fp2, &fd, vfs_context_current()); if (error) { goto free3; } fp2->f_flag = FREAD | FWRITE; fp2->f_ops = &socketops; fp_set_data(fp2, so2); sv[1] = fd; error = soconnect2(so1, so2); if (error) { goto free4; } if (uap->type == SOCK_DGRAM) { /* * Datagram socket connection is asymmetric. */ error = soconnect2(so2, so1); if (error) { goto free4; } } if ((error = copyout(sv, uap->rsv, 2 * sizeof(int))) != 0) { goto free4; } proc_fdlock(p); procfdtbl_releasefd(p, sv[0], NULL); procfdtbl_releasefd(p, sv[1], NULL); fp_drop(p, sv[0], fp1, 1); fp_drop(p, sv[1], fp2, 1); proc_fdunlock(p); return 0; free4: fp_free(p, sv[1], fp2); free3: fp_free(p, sv[0], fp1); free2: (void) soclose(so2); free1: (void) soclose(so1); return error; } /* * Returns: 0 Success * EINVAL * ENOBUFS * EBADF * EPIPE * EACCES Mandatory Access Control failure * file_socket:ENOTSOCK * file_socket:EBADF * getsockaddr:ENAMETOOLONG Filename too long * getsockaddr:EINVAL Invalid argument * getsockaddr:ENOMEM Not enough space * getsockaddr:EFAULT Bad address * <pru_sosend>:EACCES[TCP] * <pru_sosend>:EADDRINUSE[TCP] * <pru_sosend>:EADDRNOTAVAIL[TCP] * <pru_sosend>:EAFNOSUPPORT[TCP] * <pru_sosend>:EAGAIN[TCP] * <pru_sosend>:EBADF * <pru_sosend>:ECONNRESET[TCP] * <pru_sosend>:EFAULT * <pru_sosend>:EHOSTUNREACH[TCP] * <pru_sosend>:EINTR * <pru_sosend>:EINVAL * <pru_sosend>:EISCONN[AF_INET] * <pru_sosend>:EMSGSIZE[TCP] * <pru_sosend>:ENETDOWN[TCP] * <pru_sosend>:ENETUNREACH[TCP] * <pru_sosend>:ENOBUFS * <pru_sosend>:ENOMEM[TCP] * <pru_sosend>:ENOTCONN[AF_INET] * <pru_sosend>:EOPNOTSUPP * <pru_sosend>:EPERM[TCP] * <pru_sosend>:EPIPE * <pru_sosend>:EWOULDBLOCK * <pru_sosend>:???[TCP] [ignorable: mostly IPSEC/firewall/DLIL] * <pru_sosend>:???[AF_INET] [whatever a filter author chooses] * <pru_sosend>:??? [value from so_error] * sockargs:??? */ static int sendit(proc_ref_t p, struct socket *so, user_msghdr_ref_t mp, uio_t uiop, int flags, int32_ref_t retval) { mbuf_ref_t control = NULL; struct sockaddr_storage ss; sockaddr_ref_t to = NULL; boolean_t want_free = TRUE; int error; user_ssize_t len; KERNEL_DEBUG(DBG_FNC_SENDIT | DBG_FUNC_START, 0, 0, 0, 0, 0); if (mp->msg_name != USER_ADDR_NULL) { if (mp->msg_namelen > sizeof(ss)) { error = getsockaddr(so, &to, mp->msg_name, mp->msg_namelen, TRUE); } else { error = getsockaddr_s(so, &ss, mp->msg_name, mp->msg_namelen, TRUE); if (error == 0) { to = (sockaddr_ref_t)&ss; want_free = FALSE; } } if (error != 0) { goto out; } AUDIT_ARG(sockaddr, vfs_context_cwd(vfs_context_current()), to); } if (mp->msg_control != USER_ADDR_NULL) { if (mp->msg_controllen < sizeof(struct cmsghdr)) { error = EINVAL; goto bad; } error = sockargs(&control, mp->msg_control, mp->msg_controllen, MT_CONTROL); if (error != 0) { goto bad; } } #if CONFIG_MACF_SOCKET_SUBSET /* * We check the state without holding the socket lock; * if a race condition occurs, it would simply result * in an extra call to the MAC check function. */ if (to != NULL && !(so->so_state & SS_DEFUNCT) && (error = mac_socket_check_send(kauth_cred_get(), so, to)) != 0) { if (control != NULL) { m_freem(control); } goto bad; } #endif /* MAC_SOCKET_SUBSET */ len = uio_resid(uiop); error = so->so_proto->pr_usrreqs->pru_sosend(so, to, uiop, 0, control, flags); if (error != 0) { if (uio_resid(uiop) != len && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) { error = 0; } /* Generation of SIGPIPE can be controlled per socket */ if (error == EPIPE && !(so->so_flags & SOF_NOSIGPIPE) && !(flags & MSG_NOSIGNAL)) { psignal(p, SIGPIPE); } } if (error == 0) { *retval = (int)(len - uio_resid(uiop)); } bad: if (want_free) { free_sockaddr(to); } out: KERNEL_DEBUG(DBG_FNC_SENDIT | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } /* * Returns: 0 Success * ENOMEM * sendit:??? [see sendit definition in this file] * write:??? [4056224: applicable for pipes] */ int sendto(proc_ref_t p, struct sendto_args *uap, int32_ref_t retval) { __pthread_testcancel(1); return sendto_nocancel(p, (struct sendto_nocancel_args *)uap, retval); } int sendto_nocancel(proc_ref_t p, struct sendto_nocancel_args *uap, int32_ref_t retval) { struct user_msghdr msg; int error; uio_t auio = NULL; socket_ref_t so; KERNEL_DEBUG(DBG_FNC_SENDTO | DBG_FUNC_START, 0, 0, 0, 0, 0); AUDIT_ARG(fd, uap->s); if (uap->flags & MSG_SKIPCFIL) { error = EPERM; goto done; } if (uap->len > LONG_MAX) { error = EINVAL; goto done; } auio = uio_create(1, 0, (IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32), UIO_WRITE); if (auio == NULL) { error = ENOMEM; goto done; } uio_addiov(auio, uap->buf, uap->len); msg.msg_name = uap->to; msg.msg_namelen = uap->tolen; /* no need to set up msg_iov. sendit uses uio_t we send it */ msg.msg_iov = 0; msg.msg_iovlen = 0; msg.msg_control = 0; msg.msg_flags = 0; error = file_socket(uap->s, &so); if (error) { goto done; } if (so == NULL) { error = EBADF; } else { error = sendit(p, so, &msg, auio, uap->flags, retval); } file_drop(uap->s); done: if (auio != NULL) { uio_free(auio); } KERNEL_DEBUG(DBG_FNC_SENDTO | DBG_FUNC_END, error, *retval, 0, 0, 0); return error; } /* * Returns: 0 Success * ENOBUFS * copyin:EFAULT * sendit:??? [see sendit definition in this file] */ int sendmsg(proc_ref_t p, struct sendmsg_args *uap, int32_ref_t retval) { __pthread_testcancel(1); return sendmsg_nocancel(p, (struct sendmsg_nocancel_args *)uap, retval); } int sendmsg_nocancel(proc_ref_t p, struct sendmsg_nocancel_args *uap, int32_ref_t retval) { struct user32_msghdr msg32; struct user64_msghdr msg64; struct user_msghdr user_msg; caddr_t msghdrp; int size_of_msghdr; int error; uio_t auio = NULL; struct user_iovec *iovp; socket_ref_t so; const bool is_p_64bit_process = IS_64BIT_PROCESS(p); KERNEL_DEBUG(DBG_FNC_SENDMSG | DBG_FUNC_START, 0, 0, 0, 0, 0); AUDIT_ARG(fd, uap->s); if (uap->flags & MSG_SKIPCFIL) { error = EPERM; goto done; } if (is_p_64bit_process) { msghdrp = (caddr_t)&msg64; size_of_msghdr = sizeof(msg64); } else { msghdrp = (caddr_t)&msg32; size_of_msghdr = sizeof(msg32); } error = copyin(uap->msg, msghdrp, size_of_msghdr); if (error) { KERNEL_DEBUG(DBG_FNC_SENDMSG | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } if (is_p_64bit_process) { user_msg.msg_flags = msg64.msg_flags; user_msg.msg_controllen = msg64.msg_controllen; user_msg.msg_control = (user_addr_t)msg64.msg_control; user_msg.msg_iovlen = msg64.msg_iovlen; user_msg.msg_iov = (user_addr_t)msg64.msg_iov; user_msg.msg_namelen = msg64.msg_namelen; user_msg.msg_name = (user_addr_t)msg64.msg_name; } else { user_msg.msg_flags = msg32.msg_flags; user_msg.msg_controllen = msg32.msg_controllen; user_msg.msg_control = msg32.msg_control; user_msg.msg_iovlen = msg32.msg_iovlen; user_msg.msg_iov = msg32.msg_iov; user_msg.msg_namelen = msg32.msg_namelen; user_msg.msg_name = msg32.msg_name; } if (user_msg.msg_iovlen <= 0 || user_msg.msg_iovlen > UIO_MAXIOV) { KERNEL_DEBUG(DBG_FNC_SENDMSG | DBG_FUNC_END, EMSGSIZE, 0, 0, 0, 0); return EMSGSIZE; } /* allocate a uio large enough to hold the number of iovecs passed */ auio = uio_create(user_msg.msg_iovlen, 0, (is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32), UIO_WRITE); if (auio == NULL) { error = ENOBUFS; goto done; } if (user_msg.msg_iovlen) { /* * get location of iovecs within the uio. * then copyin the iovecs from user space. */ iovp = uio_iovsaddr(auio); if (iovp == NULL) { error = ENOBUFS; goto done; } error = copyin_user_iovec_array(user_msg.msg_iov, is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32, user_msg.msg_iovlen, iovp); if (error) { goto done; } user_msg.msg_iov = CAST_USER_ADDR_T(iovp); /* finish setup of uio_t */ error = uio_calculateresid(auio); if (error) { goto done; } } else { user_msg.msg_iov = 0; } /* msg_flags is ignored for send */ user_msg.msg_flags = 0; error = file_socket(uap->s, &so); if (error) { goto done; } if (so == NULL) { error = EBADF; } else { error = sendit(p, so, &user_msg, auio, uap->flags, retval); } file_drop(uap->s); done: if (auio != NULL) { uio_free(auio); } KERNEL_DEBUG(DBG_FNC_SENDMSG | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } #if DEBUG || DEVELOPMENT static int sendmsg_x_old(proc_ref_t p, struct sendmsg_x_args *uap, user_ssize_t *retval) { int error = 0; user_msghdr_x_ptr_t user_msg_x = NULL; uio_ref_ptr_t uiop = NULL; socket_ref_t so; u_int i; sockaddr_ref_t to = NULL; user_ssize_t len_before = 0, len_after; int need_drop = 0; size_t size_of_msghdr; void_ptr_t umsgp = NULL; u_int uiocnt = 0; int has_addr_or_ctl = 0; KERNEL_DEBUG(DBG_FNC_SENDMSG_X | DBG_FUNC_START, 0, 0, 0, 0, 0); size_of_msghdr = IS_64BIT_PROCESS(p) ? sizeof(struct user64_msghdr_x) : sizeof(struct user32_msghdr_x); if (uap->flags & MSG_SKIPCFIL) { error = EPERM; goto out; } error = file_socket(uap->s, &so); if (error) { goto out; } need_drop = 1; if (so == NULL) { error = EBADF; goto out; } /* * Input parameter range check */ if (uap->cnt == 0 || uap->cnt > UIO_MAXIOV) { error = EINVAL; goto out; } /* * Clip to max currently allowed */ if (uap->cnt > somaxsendmsgx) { uap->cnt = somaxsendmsgx > 0 ? somaxsendmsgx : 1; } user_msg_x = kalloc_type(struct user_msghdr_x, uap->cnt, Z_WAITOK | Z_ZERO); if (user_msg_x == NULL) { DBG_PRINTF("%s user_msg_x alloc failed", __func__); error = ENOMEM; goto out; } uiop = kalloc_type(uio_ref_t, uap->cnt, Z_WAITOK | Z_ZERO); if (uiop == NULL) { DBG_PRINTF("%s uiop alloc failed", __func__); error = ENOMEM; goto out; } umsgp = kalloc_data(uap->cnt * size_of_msghdr, Z_WAITOK | Z_ZERO); if (umsgp == NULL) { DBG_PRINTF("%s user_msg_x alloc failed", __func__); error = ENOMEM; goto out; } error = copyin(uap->msgp, umsgp, uap->cnt * size_of_msghdr); if (error) { DBG_PRINTF("%s copyin() failed", __func__); goto out; } error = internalize_user_msghdr_array(umsgp, IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32, UIO_WRITE, uap->cnt, user_msg_x, uiop); if (error) { DBG_PRINTF("%s copyin_user_msghdr_array() failed", __func__); goto out; } /* * Make sure the size of each message iovec and * the aggregate size of all the iovec is valid */ if (uio_array_is_valid(uiop, uap->cnt) == false) { error = EINVAL; goto out; } /* * Sanity check on passed arguments */ for (i = 0; i < uap->cnt; i++) { struct user_msghdr_x *mp = user_msg_x + i; /* * No flags on send message */ if (mp->msg_flags != 0) { error = EINVAL; goto out; } /* * No support for address or ancillary data (yet) */ if (mp->msg_name != USER_ADDR_NULL || mp->msg_namelen != 0) { has_addr_or_ctl = 1; } if (mp->msg_control != USER_ADDR_NULL || mp->msg_controllen != 0) { has_addr_or_ctl = 1; } #if CONFIG_MACF_SOCKET_SUBSET /* * We check the state without holding the socket lock; * if a race condition occurs, it would simply result * in an extra call to the MAC check function. * * Note: The following check is never true taken with the * current limitation that we do not accept to pass an address, * this is effectively placeholder code. If we add support for * addresses, we will have to check every address. */ if (to != NULL && !(so->so_state & SS_DEFUNCT) && (error = mac_socket_check_send(kauth_cred_get(), so, to)) != 0) { goto out; } #endif /* MAC_SOCKET_SUBSET */ } len_before = uio_array_resid(uiop, uap->cnt); for (i = 0; i < uap->cnt; i++) { struct user_msghdr_x *mp = user_msg_x + i; struct user_msghdr user_msg; uio_t auio = uiop[i]; int32_t tmpval; user_msg.msg_flags = mp->msg_flags; user_msg.msg_controllen = mp->msg_controllen; user_msg.msg_control = mp->msg_control; user_msg.msg_iovlen = mp->msg_iovlen; user_msg.msg_iov = mp->msg_iov; user_msg.msg_namelen = mp->msg_namelen; user_msg.msg_name = mp->msg_name; error = sendit(p, so, &user_msg, auio, uap->flags, &tmpval); if (error != 0) { break; } uiocnt += 1; } len_after = uio_array_resid(uiop, uap->cnt); VERIFY(len_after <= len_before); if (error != 0) { if (len_after != len_before && (error == ERESTART || error == EINTR || error == EWOULDBLOCK || error == ENOBUFS)) { error = 0; } /* Generation of SIGPIPE can be controlled per socket */ if (error == EPIPE && !(so->so_flags & SOF_NOSIGPIPE) && !(uap->flags & MSG_NOSIGNAL)) { psignal(p, SIGPIPE); } } if (error == 0) { externalize_user_msghdr_array(umsgp, IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32, UIO_WRITE, uiocnt, user_msg_x, uiop); *retval = (int)(uiocnt); } out: if (need_drop) { file_drop(uap->s); } kfree_data(umsgp, uap->cnt * size_of_msghdr); if (uiop != NULL) { free_uio_array(uiop, uap->cnt); kfree_type(uio_ref_t, uap->cnt, uiop); } kfree_type(struct user_msghdr_x, uap->cnt, user_msg_x); KERNEL_DEBUG(DBG_FNC_SENDMSG_X | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } #endif /* DEBUG || DEVELOPMENT */ static int internalize_user_msg_x(struct user_msghdr *user_msg, uio_t *auiop, proc_ref_t p, void_ptr_t user_msghdr_x_src) { const bool is_p_64bit_process = IS_64BIT_PROCESS(p); uio_t auio = *auiop; int error; if (is_p_64bit_process) { struct user64_msghdr_x msghdrx64; error = copyin((user_addr_t)user_msghdr_x_src, &msghdrx64, sizeof(msghdrx64)); if (error != 0) { DBG_PRINTF("%s copyin() msghdrx64 failed %d", __func__, error); goto done; } user_msg->msg_name = msghdrx64.msg_name; user_msg->msg_namelen = msghdrx64.msg_namelen; user_msg->msg_iov = msghdrx64.msg_iov; user_msg->msg_iovlen = msghdrx64.msg_iovlen; user_msg->msg_control = msghdrx64.msg_control; user_msg->msg_controllen = msghdrx64.msg_controllen; } else { struct user32_msghdr_x msghdrx32; error = copyin((user_addr_t)user_msghdr_x_src, &msghdrx32, sizeof(msghdrx32)); if (error != 0) { DBG_PRINTF("%s copyin() msghdrx32 failed %d", __func__, error); goto done; } user_msg->msg_name = msghdrx32.msg_name; user_msg->msg_namelen = msghdrx32.msg_namelen; user_msg->msg_iov = msghdrx32.msg_iov; user_msg->msg_iovlen = msghdrx32.msg_iovlen; user_msg->msg_control = msghdrx32.msg_control; user_msg->msg_controllen = msghdrx32.msg_controllen; } /* msg_flags is ignored for send */ user_msg->msg_flags = 0; if (user_msg->msg_iovlen <= 0 || user_msg->msg_iovlen > UIO_MAXIOV) { error = EMSGSIZE; DBG_PRINTF("%s bad msg_iovlen, error %d", __func__, error); goto done; } /* * Attempt to reuse the uio if large enough, otherwise we need * a new one */ if (auio != NULL) { if (auio->uio_max_iovs >= user_msg->msg_iovlen) { uio_reset(auio, 0, is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32, UIO_WRITE); } else { uio_free(auio); auio = NULL; } } if (auio == NULL) { auio = uio_create(user_msg->msg_iovlen, 0, is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32, UIO_WRITE); if (auio == NULL) { error = ENOBUFS; DBG_PRINTF("%s uio_create() failed %d", __func__, error); goto done; } } if (user_msg->msg_iovlen) { /* * get location of iovecs within the uio. * then copyin the iovecs from user space. */ struct user_iovec *iovp = uio_iovsaddr(auio); if (iovp == NULL) { error = ENOBUFS; goto done; } error = copyin_user_iovec_array(user_msg->msg_iov, is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32, user_msg->msg_iovlen, iovp); if (error != 0) { goto done; } user_msg->msg_iov = CAST_USER_ADDR_T(iovp); /* finish setup of uio_t */ error = uio_calculateresid(auio); if (error) { goto done; } } else { user_msg->msg_iov = 0; } done: *auiop = auio; return error; } static int mbuf_packet_from_uio(socket_ref_t so, mbuf_ref_ref_t mp, uio_t auio) { int error = 0; uint16_t headroom = 0; size_t bytes_to_alloc; mbuf_ref_t top = NULL, m; if (soreserveheadroom != 0) { headroom = so->so_pktheadroom; } bytes_to_alloc = headroom + uio_resid(auio); error = mbuf_allocpacket(MBUF_WAITOK, bytes_to_alloc, NULL, &top); if (error != 0) { os_log(OS_LOG_DEFAULT, "mbuf_packet_from_uio: mbuf_allocpacket %zu error %d", bytes_to_alloc, error); goto done; } if (headroom > 0 && headroom < mbuf_maxlen(top)) { top->m_data += headroom; } for (m = top; m != NULL; m = m->m_next) { int bytes_to_copy = (int)uio_resid(auio); ssize_t mlen; if ((m->m_flags & M_EXT)) { mlen = m->m_ext.ext_size - M_LEADINGSPACE(m); } else if ((m->m_flags & M_PKTHDR)) { mlen = MHLEN - M_LEADINGSPACE(m); m_add_crumb(m, PKT_CRUMB_SOSEND); } else { mlen = MLEN - M_LEADINGSPACE(m); } int len = imin((int)mlen, bytes_to_copy); error = uiomove(mtod(m, caddr_t), (int)len, auio); if (error != 0) { os_log(OS_LOG_DEFAULT, "mbuf_packet_from_uio: len %d error %d", len, error); goto done; } m->m_len = len; top->m_pkthdr.len += len; } done: if (error != 0) { m_freem(top); } else { *mp = top; } return error; } static int sendit_x(proc_ref_t p, socket_ref_t so, struct sendmsg_x_args *uap, u_int *retval) { int error = 0; uio_t auio = NULL; const bool is_p_64bit_process = IS_64BIT_PROCESS(p); void_ptr_t src; MBUFQ_HEAD() pktlist = {}; size_t total_pkt_len = 0; u_int pkt_cnt = 0; int flags = uap->flags; mbuf_ref_t top; MBUFQ_INIT(&pktlist); *retval = 0; /* We re-use the uio when possible */ auio = uio_create(1, 0, (is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32), UIO_WRITE); if (auio == NULL) { error = ENOBUFS; DBG_PRINTF("%s uio_create() failed %d", __func__, error); goto done; } src = (void_ptr_t)uap->msgp; /* * Create a list of packets */ for (u_int i = 0; i < uap->cnt; i++) { struct user_msghdr user_msg = {}; mbuf_ref_t m = NULL; if (is_p_64bit_process) { error = internalize_user_msg_x(&user_msg, &auio, p, ((struct user64_msghdr_x *)src) + i); if (error != 0) { os_log(OS_LOG_DEFAULT, "sendit_x: internalize_user_msg_x error %d\n", error); goto done; } } else { error = internalize_user_msg_x(&user_msg, &auio, p, ((struct user32_msghdr_x *)src) + i); if (error != 0) { os_log(OS_LOG_DEFAULT, "sendit_x: internalize_user_msg_x error %d\n", error); goto done; } } /* * Stop on the first datagram that is too large */ if (uio_resid(auio) > so->so_snd.sb_hiwat) { if (i == 0) { error = EMSGSIZE; goto done; } break; } /* * An mbuf packet has the control mbuf(s) followed by data * We allocate the mbufs in reverse order */ error = mbuf_packet_from_uio(so, &m, auio); if (error != 0) { os_log(OS_LOG_DEFAULT, "sendit_x: mbuf_packet_from_uio error %d\n", error); goto done; } total_pkt_len += m->m_pkthdr.len; if (user_msg.msg_control != USER_ADDR_NULL && user_msg.msg_controllen != 0) { mbuf_ref_t control = NULL; error = sockargs(&control, user_msg.msg_control, user_msg.msg_controllen, MT_CONTROL); if (error != 0) { os_log(OS_LOG_DEFAULT, "sendit_x: sockargs error %d\n", error); goto done; } control->m_next = m; m = control; } MBUFQ_ENQUEUE(&pktlist, m); pkt_cnt += 1; } top = MBUFQ_FIRST(&pktlist); MBUFQ_INIT(&pktlist); error = sosend_list(so, top, total_pkt_len, &pkt_cnt, flags); if (error != 0) { os_log(OS_LOG_DEFAULT, "sendit_x: sosend_list error %d\n", error); goto done; } done: *retval = pkt_cnt; if (auio != NULL) { uio_free(auio); } MBUFQ_DRAIN(&pktlist); return error; } int sendmsg_x(proc_ref_t p, struct sendmsg_x_args *uap, user_ssize_t *retval) { void_ptr_t src; int error; uio_t auio = NULL; socket_ref_t so; u_int uiocnt = 0; const bool is_p_64bit_process = IS_64BIT_PROCESS(p); #if DEBUG || DEVELOPMENT if (sendmsg_x_mode == 2) { return sendmsg_x_old(p, uap, retval); } #endif /* DEBUG || DEVELOPMENT */ KERNEL_DEBUG(DBG_FNC_SENDMSG_X | DBG_FUNC_START, 0, 0, 0, 0, 0); AUDIT_ARG(fd, uap->s); if (uap->flags & MSG_SKIPCFIL) { error = EPERM; goto done_no_filedrop; } error = file_socket(uap->s, &so); if (error) { goto done_no_filedrop; } if (so == NULL) { error = EBADF; goto done; } /* * For an atomic datagram connected socket we can build the list of * mbuf packets with sosend_list() */ if (so->so_type == SOCK_DGRAM && sosendallatonce(so) && (so->so_state & SS_ISCONNECTED) && sendmsg_x_mode != 1) { error = sendit_x(p, so, uap, &uiocnt); if (error != 0) { DBG_PRINTF("%s sendit_x() failed %d", __func__, error); } goto done; } src = (void_ptr_t)uap->msgp; /* We re-use the uio when possible */ auio = uio_create(1, 0, (is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32), UIO_WRITE); if (auio == NULL) { error = ENOBUFS; DBG_PRINTF("%s uio_create() failed %d", __func__, error); goto done; } for (u_int i = 0; i < uap->cnt; i++) { struct user_msghdr user_msg = {}; if (is_p_64bit_process) { error = internalize_user_msg_x(&user_msg, &auio, p, ((struct user64_msghdr_x *)src) + i); if (error != 0) { goto done; } } else { error = internalize_user_msg_x(&user_msg, &auio, p, ((struct user32_msghdr_x *)src) + i); if (error != 0) { goto done; } } int32_t len = 0; error = sendit(p, so, &user_msg, auio, uap->flags, &len); if (error != 0) { break; } uiocnt += 1; } done: if (error != 0) { if (uiocnt != 0 && (error == ERESTART || error == EINTR || error == EWOULDBLOCK || error == ENOBUFS || error == EMSGSIZE)) { error = 0; } /* Generation of SIGPIPE can be controlled per socket */ if (error == EPIPE && !(so->so_flags & SOF_NOSIGPIPE) && !(uap->flags & MSG_NOSIGNAL)) { psignal(p, SIGPIPE); } } if (error == 0) { *retval = (int)(uiocnt); } file_drop(uap->s); done_no_filedrop: if (auio != NULL) { uio_free(auio); } KERNEL_DEBUG(DBG_FNC_SENDMSG_X | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } static int copyout_sa(sockaddr_ref_t fromsa, user_addr_t name, socklen_t *namelen) { int error = 0; socklen_t sa_len = 0; ssize_t len; len = *namelen; if (len <= 0 || fromsa == 0) { len = 0; } else { #ifndef MIN #define MIN(a, b) ((a) > (b) ? (b) : (a)) #endif sa_len = fromsa->sa_len; len = MIN((unsigned int)len, sa_len); error = copyout(fromsa, name, (unsigned)len); if (error) { goto out; } } *namelen = sa_len; out: return 0; } static int copyout_maddr(struct mbuf *m, user_addr_t name, socklen_t *namelen) { int error = 0; socklen_t sa_len = 0; ssize_t len; len = *namelen; if (len <= 0 || m == NULL) { len = 0; } else { #ifndef MIN #define MIN(a, b) ((a) > (b) ? (b) : (a)) #endif struct sockaddr *fromsa = mtod(m, struct sockaddr *); sa_len = fromsa->sa_len; len = MIN((unsigned int)len, sa_len); error = copyout(fromsa, name, (unsigned)len); if (error != 0) { goto out; } } *namelen = sa_len; out: return 0; } static int copyout_control(proc_ref_t p, mbuf_ref_t m, user_addr_t control, socklen_ref_t controllen, int_ref_t flags, socket_ref_t so) { int error = 0; socklen_t len; user_addr_t ctlbuf; struct inpcb *inp = NULL; bool want_pktinfo = false; bool seen_pktinfo = false; if (so != NULL && (SOCK_DOM(so) == PF_INET6 || SOCK_DOM(so) == PF_INET)) { inp = sotoinpcb(so); want_pktinfo = (inp->inp_flags & IN6P_PKTINFO) != 0; } len = *controllen; *controllen = 0; ctlbuf = control; while (m && len > 0) { socklen_t tocopy; struct cmsghdr *cp = mtod(m, struct cmsghdr *); socklen_t cp_size = CMSG_ALIGN(cp->cmsg_len); socklen_t buflen = m->m_len; while (buflen > 0 && len > 0) { /* * SCM_TIMESTAMP hack because struct timeval has a * different size for 32 bits and 64 bits processes */ if (cp->cmsg_level == SOL_SOCKET && cp->cmsg_type == SCM_TIMESTAMP) { unsigned char tmp_buffer[CMSG_SPACE(sizeof(struct user64_timeval))] = {}; struct cmsghdr *tmp_cp = (struct cmsghdr *)(void *)tmp_buffer; socklen_t tmp_space; struct timeval *tv = (struct timeval *)(void *)CMSG_DATA(cp); tmp_cp->cmsg_level = SOL_SOCKET; tmp_cp->cmsg_type = SCM_TIMESTAMP; if (proc_is64bit(p)) { struct user64_timeval *tv64 = (struct user64_timeval *)(void *)CMSG_DATA(tmp_cp); os_unaligned_deref(&tv64->tv_sec) = tv->tv_sec; os_unaligned_deref(&tv64->tv_usec) = tv->tv_usec; tmp_cp->cmsg_len = CMSG_LEN(sizeof(struct user64_timeval)); tmp_space = CMSG_SPACE(sizeof(struct user64_timeval)); } else { struct user32_timeval *tv32 = (struct user32_timeval *)(void *)CMSG_DATA(tmp_cp); tv32->tv_sec = (user32_time_t)tv->tv_sec; tv32->tv_usec = tv->tv_usec; tmp_cp->cmsg_len = CMSG_LEN(sizeof(struct user32_timeval)); tmp_space = CMSG_SPACE(sizeof(struct user32_timeval)); } if (len >= tmp_space) { tocopy = tmp_space; } else { *flags |= MSG_CTRUNC; tocopy = len; } error = copyout(tmp_buffer, ctlbuf, tocopy); if (error) { goto out; } } else { /* If socket has flow tracking and socket did not request address, ignore it */ if (SOFLOW_ENABLED(so) && ((cp->cmsg_level == IPPROTO_IP && cp->cmsg_type == IP_RECVDSTADDR && inp != NULL && !(inp->inp_flags & INP_RECVDSTADDR)) || (cp->cmsg_level == IPPROTO_IPV6 && (cp->cmsg_type == IPV6_PKTINFO || cp->cmsg_type == IPV6_2292PKTINFO) && inp && !(inp->inp_flags & IN6P_PKTINFO)))) { tocopy = 0; } else { if (cp_size > buflen) { panic("cp_size > buflen, something wrong with alignment!"); } if (len >= cp_size) { tocopy = cp_size; } else { *flags |= MSG_CTRUNC; tocopy = len; } error = copyout((caddr_t) cp, ctlbuf, tocopy); if (error) { goto out; } if (want_pktinfo && cp->cmsg_level == IPPROTO_IPV6 && (cp->cmsg_type == IPV6_PKTINFO || cp->cmsg_type == IPV6_2292PKTINFO)) { seen_pktinfo = true; } } } ctlbuf += tocopy; len -= tocopy; buflen -= cp_size; cp = (struct cmsghdr *)(void *) ((unsigned char *) cp + cp_size); cp_size = CMSG_ALIGN(cp->cmsg_len); } m = m->m_next; } *controllen = (socklen_t)(ctlbuf - control); out: if (want_pktinfo && !seen_pktinfo) { missingpktinfo += 1; #if (DEBUG || DEVELOPMENT) char pname[MAXCOMLEN]; char local[MAX_IPv6_STR_LEN + 6]; char remote[MAX_IPv6_STR_LEN + 6]; proc_name(so->last_pid, pname, sizeof(MAXCOMLEN)); if (inp->inp_vflag & INP_IPV6) { inet_ntop(AF_INET6, &inp->in6p_laddr.s6_addr, local, sizeof(local)); inet_ntop(AF_INET6, &inp->in6p_faddr.s6_addr, remote, sizeof(local)); } else { inet_ntop(AF_INET, &inp->inp_laddr.s_addr, local, sizeof(local)); inet_ntop(AF_INET, &inp->inp_faddr.s_addr, remote, sizeof(local)); } os_log(OS_LOG_DEFAULT, "cmsg IPV6_PKTINFO missing for %s:%u > %s:%u proc %s.%u error %d\n", local, ntohs(inp->inp_lport), remote, ntohs(inp->inp_fport), pname, so->last_pid, error); #endif /* (DEBUG || DEVELOPMENT) */ } return error; } /* * Returns: 0 Success * ENOTSOCK * EINVAL * EBADF * EACCES Mandatory Access Control failure * copyout:EFAULT * fp_lookup:EBADF * <pru_soreceive>:ENOBUFS * <pru_soreceive>:ENOTCONN * <pru_soreceive>:EWOULDBLOCK * <pru_soreceive>:EFAULT * <pru_soreceive>:EINTR * <pru_soreceive>:EBADF * <pru_soreceive>:EINVAL * <pru_soreceive>:EMSGSIZE * <pru_soreceive>:??? * * Notes: Additional return values from calls through <pru_soreceive> * depend on protocols other than TCP or AF_UNIX, which are * documented above. */ static int recvit(proc_ref_t p, int s, user_msghdr_ref_t mp, uio_t uiop, user_addr_t namelenp, int32_ref_t retval) { ssize_t len; int error; mbuf_ref_t control = 0; socket_ref_t so; sockaddr_ref_t fromsa = 0; fileproc_ref_t fp; KERNEL_DEBUG(DBG_FNC_RECVIT | DBG_FUNC_START, 0, 0, 0, 0, 0); if ((error = fp_get_ftype(p, s, DTYPE_SOCKET, ENOTSOCK, &fp))) { KERNEL_DEBUG(DBG_FNC_RECVIT | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } so = (struct socket *)fp_get_data(fp); #if CONFIG_MACF_SOCKET_SUBSET /* * We check the state without holding the socket lock; * if a race condition occurs, it would simply result * in an extra call to the MAC check function. */ if (!(so->so_state & SS_DEFUNCT) && !(so->so_state & SS_ISCONNECTED) && !(so->so_proto->pr_flags & PR_CONNREQUIRED) && (error = mac_socket_check_receive(kauth_cred_get(), so)) != 0) { goto out1; } #endif /* MAC_SOCKET_SUBSET */ if (uio_resid(uiop) < 0 || uio_resid(uiop) > INT_MAX) { KERNEL_DEBUG(DBG_FNC_RECVIT | DBG_FUNC_END, EINVAL, 0, 0, 0, 0); error = EINVAL; goto out1; } len = uio_resid(uiop); error = so->so_proto->pr_usrreqs->pru_soreceive(so, &fromsa, uiop, NULL, mp->msg_control ? &control : NULL, &mp->msg_flags); if (fromsa) { AUDIT_ARG(sockaddr, vfs_context_cwd(vfs_context_current()), fromsa); } if (error) { if (uio_resid(uiop) != len && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) { error = 0; } } if (error) { goto out; } *retval = (int32_t)(len - uio_resid(uiop)); if (mp->msg_name) { error = copyout_sa(fromsa, mp->msg_name, &mp->msg_namelen); if (error) { goto out; } /* return the actual, untruncated address length */ if (namelenp && (error = copyout((caddr_t)&mp->msg_namelen, namelenp, sizeof(int)))) { goto out; } } if (mp->msg_control) { error = copyout_control(p, control, mp->msg_control, &mp->msg_controllen, &mp->msg_flags, so); } out: free_sockaddr(fromsa); if (control) { m_freem(control); } KERNEL_DEBUG(DBG_FNC_RECVIT | DBG_FUNC_END, error, 0, 0, 0, 0); out1: fp_drop(p, s, fp, 0); return error; } /* * Returns: 0 Success * ENOMEM * copyin:EFAULT * recvit:??? * read:??? [4056224: applicable for pipes] * * Notes: The read entry point is only called as part of support for * binary backward compatability; new code should use read * instead of recv or recvfrom when attempting to read data * from pipes. * * For full documentation of the return codes from recvit, see * the block header for the recvit function. */ int recvfrom(proc_ref_t p, struct recvfrom_args *uap, int32_ref_t retval) { __pthread_testcancel(1); return recvfrom_nocancel(p, (struct recvfrom_nocancel_args *)uap, retval); } int recvfrom_nocancel(proc_ref_t p, struct recvfrom_nocancel_args *uap, int32_ref_t retval) { struct user_msghdr msg; int error; uio_t auio = NULL; KERNEL_DEBUG(DBG_FNC_RECVFROM | DBG_FUNC_START, 0, 0, 0, 0, 0); AUDIT_ARG(fd, uap->s); if (uap->fromlenaddr) { error = copyin(uap->fromlenaddr, (caddr_t)&msg.msg_namelen, sizeof(msg.msg_namelen)); if (error) { return error; } } else { msg.msg_namelen = 0; } msg.msg_name = uap->from; auio = uio_create(1, 0, (IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32), UIO_READ); if (auio == NULL) { return ENOMEM; } uio_addiov(auio, uap->buf, uap->len); /* no need to set up msg_iov. recvit uses uio_t we send it */ msg.msg_iov = 0; msg.msg_iovlen = 0; msg.msg_control = 0; msg.msg_controllen = 0; msg.msg_flags = uap->flags; error = recvit(p, uap->s, &msg, auio, uap->fromlenaddr, retval); if (auio != NULL) { uio_free(auio); } KERNEL_DEBUG(DBG_FNC_RECVFROM | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } /* * Returns: 0 Success * EMSGSIZE * ENOMEM * copyin:EFAULT * copyout:EFAULT * recvit:??? * * Notes: For full documentation of the return codes from recvit, see * the block header for the recvit function. */ int recvmsg(proc_ref_t p, struct recvmsg_args *uap, int32_ref_t retval) { __pthread_testcancel(1); return recvmsg_nocancel(p, (struct recvmsg_nocancel_args *)uap, retval); } int recvmsg_nocancel(proc_ref_t p, struct recvmsg_nocancel_args *uap, int32_ref_t retval) { struct user32_msghdr msg32; struct user64_msghdr msg64; struct user_msghdr user_msg; caddr_t msghdrp; int size_of_msghdr; user_addr_t uiov; int error; uio_t auio = NULL; struct user_iovec *iovp; const bool is_p_64bit_process = IS_64BIT_PROCESS(p); KERNEL_DEBUG(DBG_FNC_RECVMSG | DBG_FUNC_START, 0, 0, 0, 0, 0); AUDIT_ARG(fd, uap->s); if (is_p_64bit_process) { msghdrp = (caddr_t)&msg64; size_of_msghdr = sizeof(msg64); } else { msghdrp = (caddr_t)&msg32; size_of_msghdr = sizeof(msg32); } error = copyin(uap->msg, msghdrp, size_of_msghdr); if (error) { KERNEL_DEBUG(DBG_FNC_RECVMSG | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } /* only need to copy if user process is not 64-bit */ if (is_p_64bit_process) { user_msg.msg_flags = msg64.msg_flags; user_msg.msg_controllen = msg64.msg_controllen; user_msg.msg_control = (user_addr_t)msg64.msg_control; user_msg.msg_iovlen = msg64.msg_iovlen; user_msg.msg_iov = (user_addr_t)msg64.msg_iov; user_msg.msg_namelen = msg64.msg_namelen; user_msg.msg_name = (user_addr_t)msg64.msg_name; } else { user_msg.msg_flags = msg32.msg_flags; user_msg.msg_controllen = msg32.msg_controllen; user_msg.msg_control = msg32.msg_control; user_msg.msg_iovlen = msg32.msg_iovlen; user_msg.msg_iov = msg32.msg_iov; user_msg.msg_namelen = msg32.msg_namelen; user_msg.msg_name = msg32.msg_name; } if (user_msg.msg_iovlen <= 0 || user_msg.msg_iovlen > UIO_MAXIOV) { KERNEL_DEBUG(DBG_FNC_RECVMSG | DBG_FUNC_END, EMSGSIZE, 0, 0, 0, 0); return EMSGSIZE; } user_msg.msg_flags = uap->flags; /* allocate a uio large enough to hold the number of iovecs passed */ auio = uio_create(user_msg.msg_iovlen, 0, (is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32), UIO_READ); if (auio == NULL) { error = ENOMEM; goto done; } /* * get location of iovecs within the uio. then copyin the iovecs from * user space. */ iovp = uio_iovsaddr(auio); if (iovp == NULL) { error = ENOMEM; goto done; } uiov = user_msg.msg_iov; user_msg.msg_iov = CAST_USER_ADDR_T(iovp); error = copyin_user_iovec_array(uiov, is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32, user_msg.msg_iovlen, iovp); if (error) { goto done; } /* finish setup of uio_t */ error = uio_calculateresid(auio); if (error) { goto done; } error = recvit(p, uap->s, &user_msg, auio, 0, retval); if (!error) { user_msg.msg_iov = uiov; if (is_p_64bit_process) { msg64.msg_flags = user_msg.msg_flags; msg64.msg_controllen = user_msg.msg_controllen; msg64.msg_control = user_msg.msg_control; msg64.msg_iovlen = user_msg.msg_iovlen; msg64.msg_iov = user_msg.msg_iov; msg64.msg_namelen = user_msg.msg_namelen; msg64.msg_name = user_msg.msg_name; } else { msg32.msg_flags = user_msg.msg_flags; msg32.msg_controllen = user_msg.msg_controllen; msg32.msg_control = (user32_addr_t)user_msg.msg_control; msg32.msg_iovlen = user_msg.msg_iovlen; msg32.msg_iov = (user32_addr_t)user_msg.msg_iov; msg32.msg_namelen = user_msg.msg_namelen; msg32.msg_name = (user32_addr_t)user_msg.msg_name; } error = copyout(msghdrp, uap->msg, size_of_msghdr); } done: if (auio != NULL) { uio_free(auio); } KERNEL_DEBUG(DBG_FNC_RECVMSG | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } __attribute__((noinline)) static int recvmsg_x_array(proc_ref_t p, socket_ref_t so, struct recvmsg_x_args *uap, user_ssize_t *retval) { int error = EOPNOTSUPP; user_msghdr_x_ptr_t user_msg_x = NULL; recv_msg_elem_ptr_t recv_msg_array = NULL; user_ssize_t len_before = 0, len_after; size_t size_of_msghdr; void_ptr_t umsgp = NULL; u_int i; u_int uiocnt; int flags = uap->flags; const bool is_p_64bit_process = IS_64BIT_PROCESS(p); size_of_msghdr = is_p_64bit_process ? sizeof(struct user64_msghdr_x) : sizeof(struct user32_msghdr_x); /* * Support only a subset of message flags */ if (uap->flags & ~(MSG_PEEK | MSG_WAITALL | MSG_DONTWAIT | MSG_NEEDSA | MSG_NBIO)) { return EOPNOTSUPP; } /* * Input parameter range check */ if (uap->cnt == 0 || uap->cnt > UIO_MAXIOV) { error = EINVAL; goto out; } if (uap->cnt > somaxrecvmsgx) { uap->cnt = somaxrecvmsgx > 0 ? somaxrecvmsgx : 1; } user_msg_x = kalloc_type(struct user_msghdr_x, uap->cnt, Z_WAITOK | Z_ZERO); if (user_msg_x == NULL) { DBG_PRINTF("%s user_msg_x alloc failed", __func__); error = ENOMEM; goto out; } recv_msg_array = alloc_recv_msg_array(uap->cnt); if (recv_msg_array == NULL) { DBG_PRINTF("%s alloc_recv_msg_array() failed", __func__); error = ENOMEM; goto out; } umsgp = kalloc_data(uap->cnt * size_of_msghdr, Z_WAITOK | Z_ZERO); if (umsgp == NULL) { DBG_PRINTF("%s umsgp alloc failed", __func__); error = ENOMEM; goto out; } error = copyin(uap->msgp, umsgp, uap->cnt * size_of_msghdr); if (error) { DBG_PRINTF("%s copyin() failed", __func__); goto out; } error = internalize_recv_msghdr_array(umsgp, is_p_64bit_process ? UIO_USERSPACE64 : UIO_USERSPACE32, UIO_READ, uap->cnt, user_msg_x, recv_msg_array); if (error) { DBG_PRINTF("%s copyin_user_msghdr_array() failed", __func__); goto out; } /* * Make sure the size of each message iovec and * the aggregate size of all the iovec is valid */ if (recv_msg_array_is_valid(recv_msg_array, uap->cnt) == 0) { error = EINVAL; goto out; } /* * Sanity check on passed arguments */ for (i = 0; i < uap->cnt; i++) { struct user_msghdr_x *mp = user_msg_x + i; if (mp->msg_flags != 0) { error = EINVAL; goto out; } } #if CONFIG_MACF_SOCKET_SUBSET /* * We check the state without holding the socket lock; * if a race condition occurs, it would simply result * in an extra call to the MAC check function. */ if (!(so->so_state & SS_DEFUNCT) && !(so->so_state & SS_ISCONNECTED) && !(so->so_proto->pr_flags & PR_CONNREQUIRED) && (error = mac_socket_check_receive(kauth_cred_get(), so)) != 0) { goto out; } #endif /* MAC_SOCKET_SUBSET */ len_before = recv_msg_array_resid(recv_msg_array, uap->cnt); for (i = 0; i < uap->cnt; i++) { struct recv_msg_elem *recv_msg_elem; uio_t auio; sockaddr_ref_ref_t psa; struct mbuf **controlp; recv_msg_elem = recv_msg_array + i; auio = recv_msg_elem->uio; /* * Do not block if we got at least one packet */ if (i > 0) { flags |= MSG_DONTWAIT; } psa = (recv_msg_elem->which & SOCK_MSG_SA) ? &recv_msg_elem->psa : NULL; controlp = (recv_msg_elem->which & SOCK_MSG_CONTROL) ? &recv_msg_elem->controlp : NULL; error = so->so_proto->pr_usrreqs->pru_soreceive(so, psa, auio, NULL, controlp, &flags); if (error) { break; } /* * We have some data */ recv_msg_elem->which |= SOCK_MSG_DATA; /* * Set the messages flags for this packet */ flags &= ~MSG_DONTWAIT; recv_msg_elem->flags = flags; /* * Stop on partial copy */ if (recv_msg_elem->flags & (MSG_RCVMORE | MSG_TRUNC)) { break; } } len_after = recv_msg_array_resid(recv_msg_array, uap->cnt); if (error) { if (len_after != len_before && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) { error = 0; } else { goto out; } } uiocnt = externalize_recv_msghdr_array(p, so, umsgp, uap->cnt, user_msg_x, recv_msg_array, &error); if (error != 0) { goto out; } error = copyout(umsgp, uap->msgp, uap->cnt * size_of_msghdr); if (error) { DBG_PRINTF("%s copyout() failed", __func__); goto out; } *retval = (int)(uiocnt); out: kfree_data(umsgp, uap->cnt * size_of_msghdr); free_recv_msg_array(recv_msg_array, uap->cnt); kfree_type(struct user_msghdr_x, uap->cnt, user_msg_x); return error; } int recvmsg_x(struct proc *p, struct recvmsg_x_args *uap, user_ssize_t *retval) { int error = EOPNOTSUPP; socket_ref_t so; size_t size_of_msghdrx; caddr_t msghdrxp; struct user32_msghdr_x msghdrx32 = {}; struct user64_msghdr_x msghdrx64 = {}; int spacetype; u_int i; uio_t auio = NULL; caddr_t src; int flags; struct mbuf *pkt_list = NULL, *m; struct mbuf *addr_list = NULL, *m_addr; struct mbuf *ctl_list = NULL, *control; u_int pktcnt; KERNEL_DEBUG(DBG_FNC_RECVMSG_X | DBG_FUNC_START, 0, 0, 0, 0, 0); error = file_socket(uap->s, &so); if (error) { goto done_no_filedrop; } if (so == NULL) { error = EBADF; goto done; } #if CONFIG_MACF_SOCKET_SUBSET /* * We check the state without holding the socket lock; * if a race condition occurs, it would simply result * in an extra call to the MAC check function. */ if (!(so->so_state & SS_DEFUNCT) && !(so->so_state & SS_ISCONNECTED) && !(so->so_proto->pr_flags & PR_CONNREQUIRED) && (error = mac_socket_check_receive(kauth_cred_get(), so)) != 0) { goto done; } #endif /* MAC_SOCKET_SUBSET */ /* * With soreceive_m_list, all packets must be uniform, with address and * control as they are returned in parallel lists and it's only guaranteed * when pru_send_list is supported */ if (do_recvmsg_x_donttrunc != 0 || (so->so_options & SO_DONTTRUNC)) { error = recvmsg_x_array(p, so, uap, retval); goto done; } /* * Input parameter range check */ if (uap->cnt == 0 || uap->cnt > UIO_MAXIOV) { error = EINVAL; goto done; } if (uap->cnt > somaxrecvmsgx) { uap->cnt = somaxrecvmsgx > 0 ? somaxrecvmsgx : 1; } if (IS_64BIT_PROCESS(p)) { msghdrxp = (caddr_t)&msghdrx64; size_of_msghdrx = sizeof(struct user64_msghdr_x); spacetype = UIO_USERSPACE64; } else { msghdrxp = (caddr_t)&msghdrx32; size_of_msghdrx = sizeof(struct user32_msghdr_x); spacetype = UIO_USERSPACE32; } src = (caddr_t)uap->msgp; flags = uap->flags; /* * Only allow MSG_DONTWAIT */ if ((flags & ~(MSG_DONTWAIT | MSG_NBIO)) != 0) { error = EINVAL; goto done; } /* * Receive list of packet in a single call */ pktcnt = uap->cnt; error = soreceive_m_list(so, &pktcnt, &addr_list, &pkt_list, &ctl_list, &flags); if (error != 0) { if (pktcnt != 0 && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) { error = 0; } else { goto done; } } m_addr = addr_list; m = pkt_list; control = ctl_list; for (i = 0; i < pktcnt; i++) { struct user_msghdr user_msg; ssize_t len; struct user_iovec *iovp; struct mbuf *n; if (m->m_type != MT_OOBDATA && m->m_type != MT_DATA && m->m_type != MT_HEADER) { panic("%s: m %p m_type %d != MT_DATA", __func__, m, m->m_type); } error = copyin((user_addr_t)(src + i * size_of_msghdrx), msghdrxp, size_of_msghdrx); if (error) { DBG_PRINTF("%s copyin() msghdrx failed %d\n", __func__, error); goto done; } if (spacetype == UIO_USERSPACE64) { user_msg.msg_name = msghdrx64.msg_name; user_msg.msg_namelen = msghdrx64.msg_namelen; user_msg.msg_iov = msghdrx64.msg_iov; user_msg.msg_iovlen = msghdrx64.msg_iovlen; user_msg.msg_control = msghdrx64.msg_control; user_msg.msg_controllen = msghdrx64.msg_controllen; } else { user_msg.msg_name = msghdrx32.msg_name; user_msg.msg_namelen = msghdrx32.msg_namelen; user_msg.msg_iov = msghdrx32.msg_iov; user_msg.msg_iovlen = msghdrx32.msg_iovlen; user_msg.msg_control = msghdrx32.msg_control; user_msg.msg_controllen = msghdrx32.msg_controllen; } user_msg.msg_flags = 0; if (user_msg.msg_iovlen <= 0 || user_msg.msg_iovlen > UIO_MAXIOV) { error = EMSGSIZE; DBG_PRINTF("%s bad msg_iovlen, error %d\n", __func__, error); goto done; } /* * Attempt to reuse the uio if large enough, otherwise we need * a new one */ if (auio != NULL) { if (auio->uio_max_iovs <= user_msg.msg_iovlen) { uio_reset(auio, 0, spacetype, UIO_READ); } else { uio_free(auio); auio = NULL; } } if (auio == NULL) { auio = uio_create(user_msg.msg_iovlen, 0, spacetype, UIO_READ); if (auio == NULL) { error = ENOBUFS; DBG_PRINTF("%s uio_create() failed %d\n", __func__, error); goto done; } } /* * get location of iovecs within the uio then copy the iovecs * from user space. */ iovp = uio_iovsaddr(auio); if (iovp == NULL) { error = ENOMEM; DBG_PRINTF("%s uio_iovsaddr() failed %d\n", __func__, error); goto done; } error = copyin_user_iovec_array(user_msg.msg_iov, spacetype, user_msg.msg_iovlen, iovp); if (error != 0) { DBG_PRINTF("%s copyin_user_iovec_array() failed %d\n", __func__, error); goto done; } error = uio_calculateresid(auio); if (error != 0) { DBG_PRINTF("%s uio_calculateresid() failed %d\n", __func__, error); goto done; } user_msg.msg_iov = CAST_USER_ADDR_T(iovp); len = uio_resid(auio); for (n = m; n != NULL; n = n->m_next) { user_ssize_t resid = uio_resid(auio); if (resid < n->m_len) { error = uiomove(mtod(n, caddr_t), (int)n->m_len, auio); if (error != 0) { DBG_PRINTF("%s uiomove() failed\n", __func__); goto done; } flags |= MSG_TRUNC; break; } error = uiomove(mtod(n, caddr_t), (int)n->m_len, auio); if (error != 0) { DBG_PRINTF("%s uiomove() failed\n", __func__); goto done; } } len -= uio_resid(auio); if (user_msg.msg_name != 0 && user_msg.msg_namelen != 0) { error = copyout_maddr(m_addr, user_msg.msg_name, &user_msg.msg_namelen); if (error) { DBG_PRINTF("%s copyout_maddr() failed\n", __func__); goto done; } } if (user_msg.msg_control != 0 && user_msg.msg_controllen != 0) { error = copyout_control(p, control, user_msg.msg_control, &user_msg.msg_controllen, &user_msg.msg_flags, so); if (error) { DBG_PRINTF("%s copyout_control() failed\n", __func__); goto done; } } /* * Note: the original msg_iovlen and msg_iov do not change */ if (spacetype == UIO_USERSPACE64) { msghdrx64.msg_flags = user_msg.msg_flags; msghdrx64.msg_controllen = user_msg.msg_controllen; msghdrx64.msg_control = user_msg.msg_control; msghdrx64.msg_namelen = user_msg.msg_namelen; msghdrx64.msg_name = user_msg.msg_name; msghdrx64.msg_datalen = len; } else { msghdrx32.msg_flags = user_msg.msg_flags; msghdrx32.msg_controllen = user_msg.msg_controllen; msghdrx32.msg_control = (user32_addr_t) user_msg.msg_control; msghdrx32.msg_name = user_msg.msg_namelen; msghdrx32.msg_name = (user32_addr_t) user_msg.msg_name; msghdrx32.msg_datalen = (user32_size_t) len; } error = copyout(msghdrxp, (user_addr_t)(src + i * size_of_msghdrx), size_of_msghdrx); if (error) { DBG_PRINTF("%s copyout() msghdrx failed\n", __func__); goto done; } m = m->m_nextpkt; if (control != NULL) { control = control->m_nextpkt; } if (m_addr != NULL) { m_addr = m_addr->m_nextpkt; } } uap->flags = flags; *retval = (int)i; done: file_drop(uap->s); done_no_filedrop: if (pkt_list != NULL) { m_freem_list(pkt_list); } if (addr_list != NULL) { m_freem_list(addr_list); } if (ctl_list != NULL) { m_freem_list(ctl_list); } if (auio != NULL) { uio_free(auio); } KERNEL_DEBUG(DBG_FNC_RECVMSG_X | DBG_FUNC_END, error, 0, 0, 0, 0); return error; } /* * Returns: 0 Success * EBADF * file_socket:ENOTSOCK * file_socket:EBADF * soshutdown:EINVAL * soshutdown:ENOTCONN * soshutdown:EADDRNOTAVAIL[TCP] * soshutdown:ENOBUFS[TCP] * soshutdown:EMSGSIZE[TCP] * soshutdown:EHOSTUNREACH[TCP] * soshutdown:ENETUNREACH[TCP] * soshutdown:ENETDOWN[TCP] * soshutdown:ENOMEM[TCP] * soshutdown:EACCES[TCP] * soshutdown:EMSGSIZE[TCP] * soshutdown:ENOBUFS[TCP] * soshutdown:???[TCP] [ignorable: mostly IPSEC/firewall/DLIL] * soshutdown:??? [other protocol families] */ /* ARGSUSED */ int shutdown(__unused proc_ref_t p, struct shutdown_args *uap, __unused int32_ref_t retval) { socket_ref_t so; int error; AUDIT_ARG(fd, uap->s); error = file_socket(uap->s, &so); if (error) { return error; } if (so == NULL) { error = EBADF; goto out; } error = soshutdown((struct socket *)so, uap->how); out: file_drop(uap->s); return error; } /* * Returns: 0 Success * EFAULT * EINVAL * EACCES Mandatory Access Control failure * file_socket:ENOTSOCK * file_socket:EBADF * sosetopt:EINVAL * sosetopt:ENOPROTOOPT * sosetopt:ENOBUFS * sosetopt:EDOM * sosetopt:EFAULT * sosetopt:EOPNOTSUPP[AF_UNIX] * sosetopt:??? */ /* ARGSUSED */ int setsockopt(proc_ref_t p, setsockopt_args_ref_t uap, __unused int32_ref_t retval) { socket_ref_t so; struct sockopt sopt; int error; AUDIT_ARG(fd, uap->s); if (uap->val == 0 && uap->valsize != 0) { return EFAULT; } /* No bounds checking on size (it's unsigned) */ error = file_socket(uap->s, &so); if (error) { return error; } sopt.sopt_dir = SOPT_SET; sopt.sopt_level = uap->level; sopt.sopt_name = uap->name; sopt.sopt_val = uap->val; sopt.sopt_valsize = uap->valsize; sopt.sopt_p = p; if (so == NULL) { error = EINVAL; goto out; } #if CONFIG_MACF_SOCKET_SUBSET if ((error = mac_socket_check_setsockopt(kauth_cred_get(), so, &sopt)) != 0) { goto out; } #endif /* MAC_SOCKET_SUBSET */ error = sosetoptlock(so, &sopt, 1); /* will lock socket */ out: file_drop(uap->s); return error; } /* * Returns: 0 Success * EINVAL * EBADF * EACCES Mandatory Access Control failure * copyin:EFAULT * copyout:EFAULT * file_socket:ENOTSOCK * file_socket:EBADF * sogetopt:??? */ int getsockopt(proc_ref_t p, struct getsockopt_args *uap, __unused int32_ref_t retval) { int error; socklen_t valsize; struct sockopt sopt; socket_ref_t so; error = file_socket(uap->s, &so); if (error) { return error; } if (uap->val) { error = copyin(uap->avalsize, (caddr_t)&valsize, sizeof(valsize)); if (error) { goto out; } /* No bounds checking on size (it's unsigned) */ } else { valsize = 0; } sopt.sopt_dir = SOPT_GET; sopt.sopt_level = uap->level; sopt.sopt_name = uap->name; sopt.sopt_val = uap->val; sopt.sopt_valsize = (size_t)valsize; /* checked non-negative above */ sopt.sopt_p = p; if (so == NULL) { error = EBADF; goto out; } #if CONFIG_MACF_SOCKET_SUBSET if ((error = mac_socket_check_getsockopt(kauth_cred_get(), so, &sopt)) != 0) { goto out; } #endif /* MAC_SOCKET_SUBSET */ error = sogetoptlock((struct socket *)so, &sopt, 1); /* will lock */ if (error == 0) { valsize = (socklen_t)sopt.sopt_valsize; error = copyout((caddr_t)&valsize, uap->avalsize, sizeof(valsize)); } out: file_drop(uap->s); return error; } /* * Get socket name. * * Returns: 0 Success * EBADF * file_socket:ENOTSOCK * file_socket:EBADF * copyin:EFAULT * copyout:EFAULT * <pru_sockaddr>:ENOBUFS[TCP] * <pru_sockaddr>:ECONNRESET[TCP] * <pru_sockaddr>:EINVAL[AF_UNIX] * <sf_getsockname>:??? */ /* ARGSUSED */ int getsockname(__unused proc_ref_t p, struct getsockname_args *uap, __unused int32_ref_t retval) { socket_ref_t so; sockaddr_ref_t sa; socklen_t len; socklen_t sa_len; int error; error = file_socket(uap->fdes, &so); if (error) { return error; } error = copyin(uap->alen, (caddr_t)&len, sizeof(socklen_t)); if (error) { goto out; } if (so == NULL) { error = EBADF; goto out; } sa = 0; socket_lock(so, 1); error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, &sa); if (error == 0) { error = sflt_getsockname(so, &sa); if (error == EJUSTRETURN) { error = 0; } } socket_unlock(so, 1); if (error) { goto bad; } if (sa == 0) { len = 0; goto gotnothing; } sa_len = sa->sa_len; len = MIN(len, sa_len); error = copyout((caddr_t)sa, uap->asa, len); if (error) { goto bad; } /* return the actual, untruncated address length */ len = sa_len; gotnothing: error = copyout((caddr_t)&len, uap->alen, sizeof(socklen_t)); bad: free_sockaddr(sa); out: file_drop(uap->fdes); return error; } /* * Get name of peer for connected socket. * * Returns: 0 Success * EBADF * EINVAL * ENOTCONN * file_socket:ENOTSOCK * file_socket:EBADF * copyin:EFAULT * copyout:EFAULT * <pru_peeraddr>:??? * <sf_getpeername>:??? */ /* ARGSUSED */ int getpeername(__unused proc_ref_t p, struct getpeername_args *uap, __unused int32_ref_t retval) { socket_ref_t so; sockaddr_ref_t sa; socklen_t len; socklen_t sa_len; int error; error = file_socket(uap->fdes, &so); if (error) { return error; } if (so == NULL) { error = EBADF; goto out; } socket_lock(so, 1); if ((so->so_state & (SS_CANTRCVMORE | SS_CANTSENDMORE)) == (SS_CANTRCVMORE | SS_CANTSENDMORE)) { /* the socket has been shutdown, no more getpeername's */ socket_unlock(so, 1); error = EINVAL; goto out; } if ((so->so_state & (SS_ISCONNECTED | SS_ISCONFIRMING)) == 0) { socket_unlock(so, 1); error = ENOTCONN; goto out; } error = copyin(uap->alen, (caddr_t)&len, sizeof(socklen_t)); if (error) { socket_unlock(so, 1); goto out; } sa = 0; error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, &sa); if (error == 0) { error = sflt_getpeername(so, &sa); if (error == EJUSTRETURN) { error = 0; } } socket_unlock(so, 1); if (error) { goto bad; } if (sa == 0) { len = 0; goto gotnothing; } sa_len = sa->sa_len; len = MIN(len, sa_len); error = copyout(sa, uap->asa, len); if (error) { goto bad; } /* return the actual, untruncated address length */ len = sa_len; gotnothing: error = copyout((caddr_t)&len, uap->alen, sizeof(socklen_t)); bad: free_sockaddr(sa); out: file_drop(uap->fdes); return error; } int sockargs(struct mbuf **mp, user_addr_t data, socklen_t buflen, int type) { sockaddr_ref_t sa; struct mbuf *m; int error; socklen_t alloc_buflen = buflen; if (buflen > INT_MAX / 2) { return EINVAL; } if (type == MT_SONAME && (buflen > SOCK_MAXADDRLEN || buflen < offsetof(struct sockaddr, sa_data[0]))) { return EINVAL; } if (type == MT_CONTROL && buflen < sizeof(struct cmsghdr)) { return EINVAL; } #ifdef __LP64__ /* * The fd's in the buffer must expand to be pointers, thus we need twice * as much space */ if (type == MT_CONTROL) { alloc_buflen = ((buflen - sizeof(struct cmsghdr)) * 2) + sizeof(struct cmsghdr); } #endif if (alloc_buflen > MLEN) { if (type == MT_SONAME && alloc_buflen <= 112) { alloc_buflen = MLEN; /* unix domain compat. hack */ } else if (alloc_buflen > MCLBYTES) { return EINVAL; } } m = m_get(M_WAIT, type); if (m == NULL) { return ENOBUFS; } if (alloc_buflen > MLEN) { MCLGET(m, M_WAIT); if ((m->m_flags & M_EXT) == 0) { m_free(m); return ENOBUFS; } } /* * K64: We still copyin the original buflen because it gets expanded * later and we lie about the size of the mbuf because it only affects * unp_* functions */ m->m_len = buflen; error = copyin(data, mtod(m, caddr_t), (u_int)buflen); if (error) { (void) m_free(m); } else { *mp = m; if (type == MT_SONAME) { VERIFY(buflen <= SOCK_MAXADDRLEN); sa = mtod(m, sockaddr_ref_t); sa->sa_len = (__uint8_t)buflen; } } return error; } /* * Given a user_addr_t of length len, allocate and fill out a *sa. * * Returns: 0 Success * ENAMETOOLONG Filename too long * EINVAL Invalid argument * ENOMEM Not enough space * copyin:EFAULT Bad address */ static int getsockaddr(struct socket *so, sockaddr_ref_ref_t namp, user_addr_t uaddr, size_t len, boolean_t translate_unspec) { sockaddr_ref_t sa; int error; if (len > SOCK_MAXADDRLEN) { return ENAMETOOLONG; } if (len < offsetof(struct sockaddr, sa_data[0])) { return EINVAL; } sa = (sockaddr_ref_t)alloc_sockaddr(len, Z_WAITOK | Z_NOFAIL); error = copyin(uaddr, (caddr_t)sa, len); if (error) { free_sockaddr(sa); } else { /* * Force sa_family to AF_INET on AF_INET sockets to handle * legacy applications that use AF_UNSPEC (0). On all other * sockets we leave it unchanged and let the lower layer * handle it. */ if (translate_unspec && sa->sa_family == AF_UNSPEC && SOCK_CHECK_DOM(so, PF_INET) && len == sizeof(struct sockaddr_in)) { sa->sa_family = AF_INET; } VERIFY(len <= SOCK_MAXADDRLEN); sa = *&sa; sa->sa_len = (__uint8_t)len; *namp = sa; } return error; } static int getsockaddr_s(struct socket *so, sockaddr_storage_ref_t ss, user_addr_t uaddr, size_t len, boolean_t translate_unspec) { int error; if (ss == NULL || uaddr == USER_ADDR_NULL || len < offsetof(struct sockaddr, sa_data[0])) { return EINVAL; } /* * sockaddr_storage size is less than SOCK_MAXADDRLEN, * so the check here is inclusive. */ if (len > sizeof(*ss)) { return ENAMETOOLONG; } bzero(ss, sizeof(*ss)); error = copyin(uaddr, (caddr_t)ss, len); if (error == 0) { /* * Force sa_family to AF_INET on AF_INET sockets to handle * legacy applications that use AF_UNSPEC (0). On all other * sockets we leave it unchanged and let the lower layer * handle it. */ if (translate_unspec && ss->ss_family == AF_UNSPEC && SOCK_CHECK_DOM(so, PF_INET) && len == sizeof(struct sockaddr_in)) { ss->ss_family = AF_INET; } ss->ss_len = (__uint8_t)len; } return error; } #if DEBUG || DEVELOPMENT int internalize_user_msghdr_array(const void_ptr_t src, int spacetype, int direction, u_int count, user_msghdr_x_ptr_t dst, uio_ref_ptr_t uiop) { int error = 0; u_int i; u_int namecnt = 0; u_int ctlcnt = 0; for (i = 0; i < count; i++) { uio_t auio; struct user_iovec *iovp; struct user_msghdr_x *user_msg = dst + i; if (spacetype == UIO_USERSPACE64) { const struct user64_msghdr_x *msghdr64; msghdr64 = ((const struct user64_msghdr_x *)src) + i; user_msg->msg_name = (user_addr_t)msghdr64->msg_name; user_msg->msg_namelen = msghdr64->msg_namelen; user_msg->msg_iov = (user_addr_t)msghdr64->msg_iov; user_msg->msg_iovlen = msghdr64->msg_iovlen; user_msg->msg_control = (user_addr_t)msghdr64->msg_control; user_msg->msg_controllen = msghdr64->msg_controllen; user_msg->msg_flags = msghdr64->msg_flags; user_msg->msg_datalen = (size_t)msghdr64->msg_datalen; } else { const struct user32_msghdr_x *msghdr32; msghdr32 = ((const struct user32_msghdr_x *)src) + i; user_msg->msg_name = msghdr32->msg_name; user_msg->msg_namelen = msghdr32->msg_namelen; user_msg->msg_iov = msghdr32->msg_iov; user_msg->msg_iovlen = msghdr32->msg_iovlen; user_msg->msg_control = msghdr32->msg_control; user_msg->msg_controllen = msghdr32->msg_controllen; user_msg->msg_flags = msghdr32->msg_flags; user_msg->msg_datalen = msghdr32->msg_datalen; } if (user_msg->msg_iovlen <= 0 || user_msg->msg_iovlen > UIO_MAXIOV) { error = EMSGSIZE; goto done; } auio = uio_create(user_msg->msg_iovlen, 0, spacetype, direction); if (auio == NULL) { error = ENOMEM; goto done; } uiop[i] = auio; iovp = uio_iovsaddr(auio); if (iovp == NULL) { error = ENOMEM; goto done; } error = copyin_user_iovec_array(user_msg->msg_iov, spacetype, user_msg->msg_iovlen, iovp); if (error) { goto done; } user_msg->msg_iov = CAST_USER_ADDR_T(iovp); error = uio_calculateresid(auio); if (error) { goto done; } user_msg->msg_datalen = uio_resid(auio); if (user_msg->msg_name && user_msg->msg_namelen) { namecnt++; } if (user_msg->msg_control && user_msg->msg_controllen) { ctlcnt++; } } done: return error; } #endif /* DEBUG || DEVELOPMENT */ int internalize_recv_msghdr_array(const void_ptr_t src, int spacetype, int direction, u_int count, user_msghdr_x_ptr_t dst, recv_msg_elem_ptr_t recv_msg_array) { int error = 0; u_int i; for (i = 0; i < count; i++) { struct user_iovec *iovp; struct user_msghdr_x *user_msg = dst + i; struct recv_msg_elem *recv_msg_elem = recv_msg_array + i; if (spacetype == UIO_USERSPACE64) { const struct user64_msghdr_x *msghdr64; msghdr64 = ((const struct user64_msghdr_x *)src) + i; user_msg->msg_name = (user_addr_t)msghdr64->msg_name; user_msg->msg_namelen = msghdr64->msg_namelen; user_msg->msg_iov = (user_addr_t)msghdr64->msg_iov; user_msg->msg_iovlen = msghdr64->msg_iovlen; user_msg->msg_control = (user_addr_t)msghdr64->msg_control; user_msg->msg_controllen = msghdr64->msg_controllen; user_msg->msg_flags = msghdr64->msg_flags; user_msg->msg_datalen = (size_t)msghdr64->msg_datalen; } else { const struct user32_msghdr_x *msghdr32; msghdr32 = ((const struct user32_msghdr_x *)src) + i; user_msg->msg_name = msghdr32->msg_name; user_msg->msg_namelen = msghdr32->msg_namelen; user_msg->msg_iov = msghdr32->msg_iov; user_msg->msg_iovlen = msghdr32->msg_iovlen; user_msg->msg_control = msghdr32->msg_control; user_msg->msg_controllen = msghdr32->msg_controllen; user_msg->msg_flags = msghdr32->msg_flags; user_msg->msg_datalen = msghdr32->msg_datalen; } if (user_msg->msg_iovlen <= 0 || user_msg->msg_iovlen > UIO_MAXIOV) { error = EMSGSIZE; goto done; } recv_msg_elem->uio = uio_create(user_msg->msg_iovlen, 0, spacetype, direction); if (recv_msg_elem->uio == NULL) { error = ENOMEM; goto done; } iovp = uio_iovsaddr(recv_msg_elem->uio); if (iovp == NULL) { error = ENOMEM; goto done; } error = copyin_user_iovec_array(user_msg->msg_iov, spacetype, user_msg->msg_iovlen, iovp); if (error) { goto done; } user_msg->msg_iov = CAST_USER_ADDR_T(iovp); error = uio_calculateresid(recv_msg_elem->uio); if (error) { goto done; } user_msg->msg_datalen = uio_resid(recv_msg_elem->uio); if (user_msg->msg_name && user_msg->msg_namelen) { recv_msg_elem->which |= SOCK_MSG_SA; } if (user_msg->msg_control && user_msg->msg_controllen) { recv_msg_elem->which |= SOCK_MSG_CONTROL; } } done: return error; } #if DEBUG || DEVELOPMENT void externalize_user_msghdr_array(void_ptr_t dst, int spacetype, int direction, u_int count, const user_msghdr_x_ptr_t src, uio_ref_ptr_t uiop) { #pragma unused(direction) u_int i; for (i = 0; i < count; i++) { const struct user_msghdr_x *user_msg = src + i; uio_t auio = uiop[i]; user_ssize_t len = user_msg->msg_datalen - uio_resid(auio); if (spacetype == UIO_USERSPACE64) { struct user64_msghdr_x *msghdr64; msghdr64 = ((struct user64_msghdr_x *)dst) + i; msghdr64->msg_flags = user_msg->msg_flags; msghdr64->msg_datalen = len; } else { struct user32_msghdr_x *msghdr32; msghdr32 = ((struct user32_msghdr_x *)dst) + i; msghdr32->msg_flags = user_msg->msg_flags; msghdr32->msg_datalen = (user32_size_t)len; } } } #endif /* DEBUG || DEVELOPMENT */ u_int externalize_recv_msghdr_array(proc_ref_t p, socket_ref_t so, void_ptr_t dst, u_int count, user_msghdr_x_ptr_t src, recv_msg_elem_ptr_t recv_msg_array, int_ref_t ret_error) { u_int i; u_int retcnt = 0; int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32; *ret_error = 0; for (i = 0; i < count; i++) { struct user_msghdr_x *user_msg = src + i; struct recv_msg_elem *recv_msg_elem = recv_msg_array + i; user_ssize_t len = 0; int error; len = user_msg->msg_datalen - uio_resid(recv_msg_elem->uio); if ((recv_msg_elem->which & SOCK_MSG_DATA)) { retcnt++; if (recv_msg_elem->which & SOCK_MSG_SA) { error = copyout_sa(recv_msg_elem->psa, user_msg->msg_name, &user_msg->msg_namelen); if (error != 0) { *ret_error = error; return 0; } } if (recv_msg_elem->which & SOCK_MSG_CONTROL) { error = copyout_control(p, recv_msg_elem->controlp, user_msg->msg_control, &user_msg->msg_controllen, &recv_msg_elem->flags, so); if (error != 0) { *ret_error = error; return 0; } } } if (spacetype == UIO_USERSPACE64) { struct user64_msghdr_x *msghdr64 = ((struct user64_msghdr_x *)dst) + i; msghdr64->msg_namelen = user_msg->msg_namelen; msghdr64->msg_controllen = user_msg->msg_controllen; msghdr64->msg_flags = recv_msg_elem->flags; msghdr64->msg_datalen = len; } else { struct user32_msghdr_x *msghdr32 = ((struct user32_msghdr_x *)dst) + i; msghdr32->msg_namelen = user_msg->msg_namelen; msghdr32->msg_controllen = user_msg->msg_controllen; msghdr32->msg_flags = recv_msg_elem->flags; msghdr32->msg_datalen = (user32_size_t)len; } } return retcnt; } #if DEBUG || DEVELOPMENT void free_uio_array(uio_ref_ptr_t uiop, u_int count) { u_int i; for (i = 0; i < count; i++) { if (uiop[i] != NULL) { uio_free(uiop[i]); } } } #endif /* DEBUG || DEVELOPMENT */ /* Extern linkage requires using __counted_by instead of bptr */ __private_extern__ user_ssize_t uio_array_resid(uio_ref_t * __counted_by(count)uiop, u_int count) { user_ssize_t len = 0; u_int i; for (i = 0; i < count; i++) { struct uio *auio = uiop[i]; if (auio != NULL) { len += uio_resid(auio); } } return len; } #if DEBUG || DEVELOPMENT static boolean_t uio_array_is_valid(uio_ref_ptr_t uiop, u_int count) { user_ssize_t len = 0; u_int i; for (i = 0; i < count; i++) { struct uio *auio = uiop[i]; if (auio != NULL) { user_ssize_t resid = uio_resid(auio); /* * Sanity check on the validity of the iovec: * no point of going over sb_max */ if (resid < 0 || resid > (user_ssize_t)sb_max) { return false; } len += resid; if (len < 0 || len > (user_ssize_t)sb_max) { return false; } } } return true; } #endif /* DEBUG || DEVELOPMENT */ recv_msg_elem_ptr_t alloc_recv_msg_array(u_int count) { return kalloc_type(struct recv_msg_elem, count, Z_WAITOK | Z_ZERO); } void free_recv_msg_array(recv_msg_elem_ptr_t recv_msg_array, u_int count) { if (recv_msg_array == NULL) { return; } for (uint32_t i = 0; i < count; i++) { struct recv_msg_elem *recv_msg_elem = recv_msg_array + i; if (recv_msg_elem->uio != NULL) { uio_free(recv_msg_elem->uio); } free_sockaddr(recv_msg_elem->psa); if (recv_msg_elem->controlp != NULL) { m_freem(recv_msg_elem->controlp); } } kfree_type(struct recv_msg_elem, count, recv_msg_array); } /* Extern linkage requires using __counted_by instead of bptr */ __private_extern__ user_ssize_t recv_msg_array_resid(struct recv_msg_elem * __counted_by(count)recv_msg_array, u_int count) { user_ssize_t len = 0; u_int i; for (i = 0; i < count; i++) { struct recv_msg_elem *recv_msg_elem = recv_msg_array + i; if (recv_msg_elem->uio != NULL) { len += uio_resid(recv_msg_elem->uio); } } return len; } int recv_msg_array_is_valid(recv_msg_elem_ptr_t recv_msg_array, u_int count) { user_ssize_t len = 0; u_int i; for (i = 0; i < count; i++) { struct recv_msg_elem *recv_msg_elem = recv_msg_array + i; if (recv_msg_elem->uio != NULL) { user_ssize_t resid = uio_resid(recv_msg_elem->uio); /* * Sanity check on the validity of the iovec: * no point of going over sb_max */ if (resid < 0 || (u_int32_t)resid > sb_max) { return 0; } len += resid; if (len < 0 || (u_int32_t)len > sb_max) { return 0; } } } return 1; } #if SENDFILE #define SFUIOBUFS 64 /* Macros to compute the number of mbufs needed depending on cluster size */ #define HOWMANY_16K(n) ((((unsigned int)(n) - 1) >> M16KCLSHIFT) + 1) #define HOWMANY_4K(n) ((((unsigned int)(n) - 1) >> MBIGCLSHIFT) + 1) /* Upper send limit in bytes (SFUIOBUFS * PAGESIZE) */ #define SENDFILE_MAX_BYTES (SFUIOBUFS << PGSHIFT) /* Upper send limit in the number of mbuf clusters */ #define SENDFILE_MAX_16K HOWMANY_16K(SENDFILE_MAX_BYTES) #define SENDFILE_MAX_4K HOWMANY_4K(SENDFILE_MAX_BYTES) static void alloc_sendpkt(int how, size_t pktlen, unsigned int *maxchunks, mbuf_ref_ref_t m, boolean_t jumbocl) { unsigned int needed; if (pktlen == 0) { panic("%s: pktlen (%ld) must be non-zero", __func__, pktlen); } /* * Try to allocate for the whole thing. Since we want full control * over the buffer size and be able to accept partial result, we can't * use mbuf_allocpacket(). The logic below is similar to sosend(). */ *m = NULL; if (pktlen > MBIGCLBYTES && jumbocl) { needed = MIN(SENDFILE_MAX_16K, HOWMANY_16K(pktlen)); *m = m_getpackets_internal(&needed, 1, how, 0, M16KCLBYTES); } if (*m == NULL) { needed = MIN(SENDFILE_MAX_4K, HOWMANY_4K(pktlen)); *m = m_getpackets_internal(&needed, 1, how, 0, MBIGCLBYTES); } /* * Our previous attempt(s) at allocation had failed; the system * may be short on mbufs, and we want to block until they are * available. This time, ask just for 1 mbuf and don't return * until we get it. */ if (*m == NULL) { needed = 1; *m = m_getpackets_internal(&needed, 1, M_WAIT, 1, MBIGCLBYTES); } if (*m == NULL) { panic("%s: blocking allocation returned NULL", __func__); } *maxchunks = needed; } /* * sendfile(2). * int sendfile(int fd, int s, off_t offset, off_t *nbytes, * struct sf_hdtr *hdtr, int flags) * * Send a file specified by 'fd' and starting at 'offset' to a socket * specified by 's'. Send only '*nbytes' of the file or until EOF if * *nbytes == 0. Optionally add a header and/or trailer to the socket * output. If specified, write the total number of bytes sent into *nbytes. */ int sendfile(proc_ref_t p, struct sendfile_args *uap, __unused int *retval) { fileproc_ref_t fp; vnode_ref_t vp; socket_ref_t so; struct writev_nocancel_args nuap; user_ssize_t writev_retval; struct user_sf_hdtr user_hdtr; struct user32_sf_hdtr user32_hdtr; struct user64_sf_hdtr user64_hdtr; off_t off, xfsize; off_t nbytes = 0, sbytes = 0; int error = 0; size_t sizeof_hdtr; off_t file_size; struct vfs_context context = *vfs_context_current(); const bool is_p_64bit_process = IS_64BIT_PROCESS(p); KERNEL_DEBUG_CONSTANT((DBG_FNC_SENDFILE | DBG_FUNC_START), uap->s, 0, 0, 0, 0); AUDIT_ARG(fd, uap->fd); AUDIT_ARG(value32, uap->s); /* * Do argument checking. Must be a regular file in, stream * type and connected socket out, positive offset. */ if ((error = fp_getfvp(p, uap->fd, &fp, &vp))) { goto done; } if ((fp->f_flag & FREAD) == 0) { error = EBADF; goto done1; } if (vnode_isreg(vp) == 0) { error = ENOTSUP; goto done1; } error = file_socket(uap->s, &so); if (error) { goto done1; } if (so == NULL) { error = EBADF; goto done2; } if (so->so_type != SOCK_STREAM) { error = EINVAL; goto done2; } if ((so->so_state & SS_ISCONNECTED) == 0) { error = ENOTCONN; goto done2; } if (uap->offset < 0) { error = EINVAL; goto done2; } if (uap->nbytes == USER_ADDR_NULL) { error = EINVAL; goto done2; } if (uap->flags != 0) { error = EINVAL; goto done2; } context.vc_ucred = fp->fp_glob->fg_cred; #if CONFIG_MACF_SOCKET_SUBSET /* JMM - fetch connected sockaddr? */ error = mac_socket_check_send(context.vc_ucred, so, NULL); if (error) { goto done2; } #endif /* * Get number of bytes to send * Should it applies to size of header and trailer? */ error = copyin(uap->nbytes, &nbytes, sizeof(off_t)); if (error) { goto done2; } /* * If specified, get the pointer to the sf_hdtr struct for * any headers/trailers. */ if (uap->hdtr != USER_ADDR_NULL) { caddr_t hdtrp; bzero(&user_hdtr, sizeof(user_hdtr)); if (is_p_64bit_process) { hdtrp = (caddr_t)&user64_hdtr; sizeof_hdtr = sizeof(user64_hdtr); } else { hdtrp = (caddr_t)&user32_hdtr; sizeof_hdtr = sizeof(user32_hdtr); } error = copyin(uap->hdtr, hdtrp, sizeof_hdtr); if (error) { goto done2; } if (is_p_64bit_process) { user_hdtr.headers = user64_hdtr.headers; user_hdtr.hdr_cnt = user64_hdtr.hdr_cnt; user_hdtr.trailers = user64_hdtr.trailers; user_hdtr.trl_cnt = user64_hdtr.trl_cnt; } else { user_hdtr.headers = user32_hdtr.headers; user_hdtr.hdr_cnt = user32_hdtr.hdr_cnt; user_hdtr.trailers = user32_hdtr.trailers; user_hdtr.trl_cnt = user32_hdtr.trl_cnt; } /* * Send any headers. Wimp out and use writev(2). */ if (user_hdtr.headers != USER_ADDR_NULL) { bzero(&nuap, sizeof(struct writev_args)); nuap.fd = uap->s; nuap.iovp = user_hdtr.headers; nuap.iovcnt = user_hdtr.hdr_cnt; error = writev_nocancel(p, &nuap, &writev_retval); if (error) { goto done2; } sbytes += writev_retval; } } /* * Get the file size for 2 reasons: * 1. We don't want to allocate more mbufs than necessary * 2. We don't want to read past the end of file */ if ((error = vnode_size(vp, &file_size, vfs_context_current())) != 0) { goto done2; } /* * Simply read file data into a chain of mbufs that used with scatter * gather reads. We're not (yet?) setup to use zero copy external * mbufs that point to the file pages. */ socket_lock(so, 1); error = sblock(&so->so_snd, SBL_WAIT); if (error) { socket_unlock(so, 1); goto done2; } for (off = uap->offset;; off += xfsize, sbytes += xfsize) { mbuf_ref_t m0 = NULL; mbuf_t m; unsigned int nbufs = SFUIOBUFS, i; uio_t auio; UIO_STACKBUF(uio_buf, SFUIOBUFS); /* 1KB !!! */ size_t uiolen; user_ssize_t rlen; off_t pgoff; size_t pktlen; boolean_t jumbocl; /* * Calculate the amount to transfer. * Align to round number of pages. * Not to exceed send socket buffer, * the EOF, or the passed in nbytes. */ xfsize = sbspace(&so->so_snd); if (xfsize <= 0) { if (so->so_state & SS_CANTSENDMORE) { error = EPIPE; goto done3; } else if ((so->so_state & SS_NBIO)) { error = EAGAIN; goto done3; } else { xfsize = PAGE_SIZE; } } if (xfsize > SENDFILE_MAX_BYTES) { xfsize = SENDFILE_MAX_BYTES; } else if (xfsize > PAGE_SIZE) { xfsize = trunc_page(xfsize); } pgoff = off & PAGE_MASK_64; if (pgoff > 0 && PAGE_SIZE - pgoff < xfsize) { xfsize = PAGE_SIZE_64 - pgoff; } if (nbytes && xfsize > (nbytes - sbytes)) { xfsize = nbytes - sbytes; } if (xfsize <= 0) { break; } if (off + xfsize > file_size) { xfsize = file_size - off; } if (xfsize <= 0) { break; } /* * Attempt to use larger than system page-size clusters for * large writes only if there is a jumbo cluster pool and * if the socket is marked accordingly. */ jumbocl = sosendjcl && njcl > 0 && ((so->so_flags & SOF_MULTIPAGES) || sosendjcl_ignore_capab); socket_unlock(so, 0); alloc_sendpkt(M_WAIT, xfsize, &nbufs, &m0, jumbocl); pktlen = mbuf_pkthdr_maxlen(m0); if (pktlen < (size_t)xfsize) { xfsize = pktlen; } auio = uio_createwithbuffer(nbufs, off, UIO_SYSSPACE, UIO_READ, &uio_buf[0], sizeof(uio_buf)); if (auio == NULL) { DBG_PRINTF("sendfile failed. nbufs = %d. %s", nbufs, "File a radar related to rdar://10146739.\n"); mbuf_freem(m0); error = ENXIO; socket_lock(so, 0); goto done3; } for (i = 0, m = m0, uiolen = 0; i < nbufs && m != NULL && uiolen < (size_t)xfsize; i++, m = mbuf_next(m)) { size_t mlen = mbuf_maxlen(m); if (mlen + uiolen > (size_t)xfsize) { mlen = xfsize - uiolen; } mbuf_setlen(m, mlen); uio_addiov(auio, CAST_USER_ADDR_T(mbuf_datastart(m)), mlen); uiolen += mlen; } if (xfsize != uio_resid(auio)) { DBG_PRINTF("sendfile: xfsize: %lld != uio_resid(auio): " "%lld\n", xfsize, (long long)uio_resid(auio)); } KERNEL_DEBUG_CONSTANT((DBG_FNC_SENDFILE_READ | DBG_FUNC_START), uap->s, (unsigned int)((xfsize >> 32) & 0x0ffffffff), (unsigned int)(xfsize & 0x0ffffffff), 0, 0); error = fo_read(fp, auio, FOF_OFFSET, &context); socket_lock(so, 0); if (error != 0) { if (uio_resid(auio) != xfsize && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) { error = 0; } else { mbuf_freem(m0); goto done3; } } xfsize -= uio_resid(auio); KERNEL_DEBUG_CONSTANT((DBG_FNC_SENDFILE_READ | DBG_FUNC_END), uap->s, (unsigned int)((xfsize >> 32) & 0x0ffffffff), (unsigned int)(xfsize & 0x0ffffffff), 0, 0); if (xfsize == 0) { break; } if (xfsize + off > file_size) { DBG_PRINTF("sendfile: xfsize: %lld + off: %lld > file_size:" "%lld\n", xfsize, off, file_size); } for (i = 0, m = m0, rlen = 0; i < nbufs && m != NULL && rlen < xfsize; i++, m = mbuf_next(m)) { size_t mlen = mbuf_maxlen(m); if (rlen + mlen > (size_t)xfsize) { mlen = xfsize - rlen; } mbuf_setlen(m, mlen); rlen += mlen; } mbuf_pkthdr_setlen(m0, xfsize); retry_space: /* * Make sure that the socket is still able to take more data. * CANTSENDMORE being true usually means that the connection * was closed. so_error is true when an error was sensed after * a previous send. * The state is checked after the page mapping and buffer * allocation above since those operations may block and make * any socket checks stale. From this point forward, nothing * blocks before the pru_send (or more accurately, any blocking * results in a loop back to here to re-check). */ if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { if (so->so_state & SS_CANTSENDMORE) { error = EPIPE; } else { error = so->so_error; so->so_error = 0; } m_freem(m0); goto done3; } /* * Wait for socket space to become available. We do this just * after checking the connection state above in order to avoid * a race condition with sbwait(). */ if (sbspace(&so->so_snd) < (long)so->so_snd.sb_lowat) { if (so->so_state & SS_NBIO) { m_freem(m0); error = EAGAIN; goto done3; } KERNEL_DEBUG_CONSTANT((DBG_FNC_SENDFILE_WAIT | DBG_FUNC_START), uap->s, 0, 0, 0, 0); error = sbwait(&so->so_snd); KERNEL_DEBUG_CONSTANT((DBG_FNC_SENDFILE_WAIT | DBG_FUNC_END), uap->s, 0, 0, 0, 0); /* * An error from sbwait usually indicates that we've * been interrupted by a signal. If we've sent anything * then return bytes sent, otherwise return the error. */ if (error) { m_freem(m0); goto done3; } goto retry_space; } mbuf_ref_t control = NULL; { /* * Socket filter processing */ error = sflt_data_out(so, NULL, &m0, &control, 0); if (error) { if (error == EJUSTRETURN) { error = 0; continue; } goto done3; } /* * End Socket filter processing */ } KERNEL_DEBUG_CONSTANT((DBG_FNC_SENDFILE_SEND | DBG_FUNC_START), uap->s, 0, 0, 0, 0); error = (*so->so_proto->pr_usrreqs->pru_send)(so, 0, m0, NULL, control, p); KERNEL_DEBUG_CONSTANT((DBG_FNC_SENDFILE_SEND | DBG_FUNC_START), uap->s, 0, 0, 0, 0); if (error) { goto done3; } } sbunlock(&so->so_snd, FALSE); /* will unlock socket */ /* * Send trailers. Wimp out and use writev(2). */ if (uap->hdtr != USER_ADDR_NULL && user_hdtr.trailers != USER_ADDR_NULL) { bzero(&nuap, sizeof(struct writev_args)); nuap.fd = uap->s; nuap.iovp = user_hdtr.trailers; nuap.iovcnt = user_hdtr.trl_cnt; error = writev_nocancel(p, &nuap, &writev_retval); if (error) { goto done2; } sbytes += writev_retval; } done2: file_drop(uap->s); done1: file_drop(uap->fd); done: if (uap->nbytes != USER_ADDR_NULL) { /* XXX this appears bogus for some early failure conditions */ copyout(&sbytes, uap->nbytes, sizeof(off_t)); } KERNEL_DEBUG_CONSTANT((DBG_FNC_SENDFILE | DBG_FUNC_END), uap->s, (unsigned int)((sbytes >> 32) & 0x0ffffffff), (unsigned int)(sbytes & 0x0ffffffff), error, 0); return error; done3: sbunlock(&so->so_snd, FALSE); /* will unlock socket */ goto done2; } #endif /* SENDFILE */ |