sys_socket.c revision 224914
1208538Sraj/*- 2208538Sraj * Copyright (c) 1982, 1986, 1990, 1993 3208538Sraj * The Regents of the University of California. All rights reserved. 4208538Sraj * 5208538Sraj * Redistribution and use in source and binary forms, with or without 6208538Sraj * modification, are permitted provided that the following conditions 7208538Sraj * are met: 8208538Sraj * 1. Redistributions of source code must retain the above copyright 9208538Sraj * notice, this list of conditions and the following disclaimer. 10208538Sraj * 2. Redistributions in binary form must reproduce the above copyright 11208538Sraj * notice, this list of conditions and the following disclaimer in the 12208538Sraj * documentation and/or other materials provided with the distribution. 13208538Sraj * 4. Neither the name of the University nor the names of its contributors 14208538Sraj * may be used to endorse or promote products derived from this software 15208538Sraj * without specific prior written permission. 16208538Sraj * 17208538Sraj * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18208538Sraj * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19208538Sraj * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20208538Sraj * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21208538Sraj * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22208538Sraj * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23208538Sraj * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24208538Sraj * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25208538Sraj * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26208538Sraj * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27208538Sraj * SUCH DAMAGE. 28208538Sraj * 29208538Sraj * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93 30208538Sraj */ 31208538Sraj 32208538Sraj#include <sys/cdefs.h> 33208538Sraj__FBSDID("$FreeBSD: head/sys/kern/sys_socket.c 224914 2011-08-16 20:07:47Z kib $"); 34208538Sraj 35208538Sraj#include <sys/param.h> 36233230Sraj#include <sys/systm.h> 37233230Sraj#include <sys/file.h> 38233230Sraj#include <sys/filedesc.h> 39208538Sraj#include <sys/proc.h> 40208538Sraj#include <sys/protosw.h> 41208538Sraj#include <sys/sigio.h> 42208538Sraj#include <sys/signal.h> 43208538Sraj#include <sys/signalvar.h> 44208538Sraj#include <sys/socket.h> 45208538Sraj#include <sys/socketvar.h> 46208538Sraj#include <sys/filio.h> /* XXX */ 47208538Sraj#include <sys/sockio.h> 48208538Sraj#include <sys/stat.h> 49208538Sraj#include <sys/uio.h> 50208538Sraj#include <sys/ucred.h> 51208538Sraj 52208538Sraj#include <net/if.h> 53208538Sraj#include <net/route.h> 54208538Sraj#include <net/vnet.h> 55208538Sraj 56208538Sraj#include <security/mac/mac_framework.h> 57208538Sraj 58235529Skientzlestruct fileops socketops = { 59235529Skientzle .fo_read = soo_read, 60233230Sraj .fo_write = soo_write, 61233230Sraj .fo_truncate = soo_truncate, 62233230Sraj .fo_ioctl = soo_ioctl, 63243693Sgonzo .fo_poll = soo_poll, 64243693Sgonzo .fo_kqfilter = soo_kqfilter, 65247201Skientzle .fo_stat = soo_stat, 66247250Skientzle .fo_close = soo_close, 67247201Skientzle .fo_chmod = invfo_chmod, 68247250Skientzle .fo_chown = invfo_chown, 69247250Skientzle .fo_flags = DFLAG_PASSABLE 70208538Sraj}; 71235529Skientzle 72235529Skientzle/* ARGSUSED */ 73247250Skientzleint 74247250Skientzlesoo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 75247250Skientzle int flags, struct thread *td) 76235529Skientzle{ 77208538Sraj struct socket *so = fp->f_data; 78243693Sgonzo int error; 79243693Sgonzo 80208538Sraj#ifdef MAC 81208538Sraj error = mac_socket_check_receive(active_cred, so); 82243693Sgonzo if (error) 83208538Sraj return (error); 84208538Sraj#endif 85208538Sraj error = soreceive(so, 0, uio, 0, 0, 0); 86208538Sraj return (error); 87208538Sraj} 88208538Sraj 89208538Sraj/* ARGSUSED */ 90208538Srajint 91243693Sgonzosoo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 92208538Sraj int flags, struct thread *td) 93208538Sraj{ 94208538Sraj struct socket *so = fp->f_data; 95208538Sraj int error; 96208538Sraj 97208538Sraj#ifdef MAC 98243693Sgonzo error = mac_socket_check_send(active_cred, so); 99208538Sraj if (error) 100208538Sraj return (error); 101208538Sraj#endif 102243693Sgonzo error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 103243693Sgonzo if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 104243693Sgonzo PROC_LOCK(uio->uio_td->td_proc); 105243693Sgonzo tdsignal(uio->uio_td, SIGPIPE); 106243693Sgonzo PROC_UNLOCK(uio->uio_td->td_proc); 107243693Sgonzo } 108243693Sgonzo return (error); 109243693Sgonzo} 110243693Sgonzo 111243693Sgonzoint 112243693Sgonzosoo_truncate(struct file *fp, off_t length, struct ucred *active_cred, 113208538Sraj struct thread *td) 114208538Sraj{ 115208538Sraj 116208538Sraj return (EINVAL); 117208538Sraj} 118233230Sraj 119235529Skientzleint 120233230Srajsoo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 121248121Sian struct thread *td) 122248121Sian{ 123233230Sraj struct socket *so = fp->f_data; 124248121Sian int error = 0; 125233230Sraj 126233230Sraj switch (cmd) { 127233230Sraj case FIONBIO: 128235529Skientzle SOCK_LOCK(so); 129248121Sian if (*(int *)data) 130233230Sraj so->so_state |= SS_NBIO; 131248934Skientzle else 132235529Skientzle so->so_state &= ~SS_NBIO; 133233230Sraj SOCK_UNLOCK(so); 134233230Sraj break; 135233230Sraj 136233230Sraj case FIOASYNC: 137233230Sraj /* 138233230Sraj * XXXRW: This code separately acquires SOCK_LOCK(so) and 139233230Sraj * SOCKBUF_LOCK(&so->so_rcv) even though they are the same 140248121Sian * mutex to avoid introducing the assumption that they are 141248121Sian * the same. 142233230Sraj */ 143233230Sraj if (*(int *)data) { 144248121Sian SOCK_LOCK(so); 145233230Sraj so->so_state |= SS_ASYNC; 146248121Sian SOCK_UNLOCK(so); 147233230Sraj SOCKBUF_LOCK(&so->so_rcv); 148233230Sraj so->so_rcv.sb_flags |= SB_ASYNC; 149248121Sian SOCKBUF_UNLOCK(&so->so_rcv); 150233230Sraj SOCKBUF_LOCK(&so->so_snd); 151248121Sian so->so_snd.sb_flags |= SB_ASYNC; 152248121Sian SOCKBUF_UNLOCK(&so->so_snd); 153248121Sian } else { 154248121Sian SOCK_LOCK(so); 155248121Sian so->so_state &= ~SS_ASYNC; 156248121Sian SOCK_UNLOCK(so); 157233230Sraj SOCKBUF_LOCK(&so->so_rcv); 158233230Sraj so->so_rcv.sb_flags &= ~SB_ASYNC; 159233230Sraj SOCKBUF_UNLOCK(&so->so_rcv); 160233230Sraj SOCKBUF_LOCK(&so->so_snd); 161233230Sraj so->so_snd.sb_flags &= ~SB_ASYNC; 162233230Sraj SOCKBUF_UNLOCK(&so->so_snd); 163233230Sraj } 164233230Sraj break; 165233230Sraj 166233230Sraj case FIONREAD: 167233230Sraj /* Unlocked read. */ 168233230Sraj *(int *)data = so->so_rcv.sb_cc; 169233230Sraj break; 170235529Skientzle 171235529Skientzle case FIONWRITE: 172235529Skientzle /* Unlocked read. */ 173235529Skientzle *(int *)data = so->so_snd.sb_cc; 174235529Skientzle break; 175233230Sraj 176233230Sraj case FIONSPACE: 177233230Sraj if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) || 178235529Skientzle (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 179235529Skientzle *(int *)data = 0; 180235529Skientzle else 181233230Sraj *(int *)data = sbspace(&so->so_snd); 182233230Sraj break; 183235529Skientzle 184233230Sraj case FIOSETOWN: 185233230Sraj error = fsetown(*(int *)data, &so->so_sigio); 186208538Sraj break; 187243693Sgonzo 188208538Sraj case FIOGETOWN: 189235529Skientzle *(int *)data = fgetown(&so->so_sigio); 190208538Sraj break; 191208538Sraj 192243693Sgonzo case SIOCSPGRP: 193243693Sgonzo error = fsetown(-(*(int *)data), &so->so_sigio); 194243693Sgonzo break; 195243693Sgonzo 196243693Sgonzo case SIOCGPGRP: 197243693Sgonzo *(int *)data = -fgetown(&so->so_sigio); 198243693Sgonzo break; 199243693Sgonzo 200243693Sgonzo case SIOCATMARK: 201243693Sgonzo /* Unlocked read. */ 202243693Sgonzo *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 203243693Sgonzo break; 204243693Sgonzo default: 205243693Sgonzo /* 206208538Sraj * Interface/routing/protocol specific ioctls: interface and 207243693Sgonzo * routing ioctls should have a different entry since a 208208538Sraj * socket is unnecessary. 209243693Sgonzo */ 210243693Sgonzo if (IOCGROUP(cmd) == 'i') 211208538Sraj error = ifioctl(so, cmd, data, td); 212235529Skientzle else if (IOCGROUP(cmd) == 'r') { 213235529Skientzle CURVNET_SET(so->so_vnet); 214243693Sgonzo error = rtioctl_fib(cmd, data, so->so_fibnum); 215235529Skientzle CURVNET_RESTORE(); 216235529Skientzle } else { 217243693Sgonzo CURVNET_SET(so->so_vnet); 218235529Skientzle error = ((*so->so_proto->pr_usrreqs->pru_control) 219235529Skientzle (so, cmd, data, 0, td)); 220243693Sgonzo CURVNET_RESTORE(); 221243693Sgonzo } 222243693Sgonzo break; 223208538Sraj } 224243693Sgonzo return (error); 225243693Sgonzo} 226243693Sgonzo 227243693Sgonzoint 228247045Skientzlesoo_poll(struct file *fp, int events, struct ucred *active_cred, 229243693Sgonzo struct thread *td) 230243693Sgonzo{ 231247250Skientzle struct socket *so = fp->f_data; 232247250Skientzle#ifdef MAC 233247250Skientzle int error; 234247250Skientzle 235247250Skientzle error = mac_socket_check_poll(active_cred, so); 236247250Skientzle if (error) 237247045Skientzle return (error); 238208538Sraj#endif 239247250Skientzle return (sopoll(so, events, fp->f_cred, td)); 240247250Skientzle} 241247250Skientzle 242247250Skientzleint 243247045Skientzlesoo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 244243693Sgonzo struct thread *td) 245247045Skientzle{ 246247045Skientzle struct socket *so = fp->f_data; 247247045Skientzle#ifdef MAC 248247045Skientzle int error; 249247045Skientzle#endif 250247201Skientzle 251247201Skientzle bzero((caddr_t)ub, sizeof (*ub)); 252247045Skientzle ub->st_mode = S_IFSOCK; 253247045Skientzle#ifdef MAC 254247045Skientzle error = mac_socket_check_stat(active_cred, so); 255247045Skientzle if (error) 256247045Skientzle return (error); 257247201Skientzle#endif 258247045Skientzle /* 259247201Skientzle * If SBS_CANTRCVMORE is set, but there's still data left in the 260247201Skientzle * receive buffer, the socket is still readable. 261247201Skientzle */ 262247201Skientzle SOCKBUF_LOCK(&so->so_rcv); 263247201Skientzle if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 264247201Skientzle so->so_rcv.sb_cc != 0) 265247045Skientzle ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 266247045Skientzle ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 267247045Skientzle SOCKBUF_UNLOCK(&so->so_rcv); 268247045Skientzle /* Unlocked read. */ 269247045Skientzle if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 270247045Skientzle ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 271247045Skientzle ub->st_uid = so->so_cred->cr_uid; 272247045Skientzle ub->st_gid = so->so_cred->cr_gid; 273247045Skientzle return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 274247045Skientzle} 275247045Skientzle 276247045Skientzle/* 277247045Skientzle * API socket close on file pointer. We call soclose() to close the socket 278247045Skientzle * (including initiating closing protocols). soclose() will sorele() the 279247045Skientzle * file reference but the actual socket will not go away until the socket's 280247045Skientzle * ref count hits 0. 281208538Sraj */ 282208538Sraj/* ARGSUSED */ 283208538Srajint 284208538Srajsoo_close(struct file *fp, struct thread *td) 285208538Sraj{ 286208538Sraj int error = 0; 287208538Sraj struct socket *so; 288208538Sraj 289208538Sraj so = fp->f_data; 290208538Sraj fp->f_ops = &badfileops; 291208538Sraj fp->f_data = NULL; 292208538Sraj 293208538Sraj if (so) 294208538Sraj error = soclose(so); 295208538Sraj return (error); 296208538Sraj} 297208538Sraj