1 /*-
2 * Copyright (c) 2015-2017 Nuxi, https://nuxi.nl/
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD: releng/11.1/sys/compat/cloudabi/cloudabi_sock.c 316574 2017-04-06 15:10:36Z ed $");
28
29 #include <sys/param.h>
30 #include <sys/capsicum.h>
31 #include <sys/lock.h>
32 #include <sys/malloc.h>
33 #include <sys/mbuf.h>
34 #include <sys/mutex.h>
35 #include <sys/proc.h>
36 #include <sys/protosw.h>
37 #include <sys/socket.h>
38 #include <sys/socketvar.h>
39 #include <sys/syscallsubr.h>
40 #include <sys/systm.h>
41 #include <sys/un.h>
42
43 #include <net/vnet.h>
44
45 #include <netinet/in.h>
46
47 #include <contrib/cloudabi/cloudabi_types_common.h>
48
49 #include <compat/cloudabi/cloudabi_proto.h>
50 #include <compat/cloudabi/cloudabi_util.h>
51
52 /* Converts FreeBSD's struct sockaddr to CloudABI's cloudabi_sockaddr_t. */
53 static void
54 cloudabi_convert_sockaddr(const struct sockaddr *sa, socklen_t sal,
55 cloudabi_sockaddr_t *rsa)
56 {
57 const struct sockaddr_in *sin;
58 const struct sockaddr_in6 *sin6;
59
60 /* Zero-sized socket address. */
61 if (sal < offsetof(struct sockaddr, sa_family) + sizeof(sa->sa_family))
62 return;
63
64 switch (sa->sa_family) {
65 case AF_INET:
66 if (sal < sizeof(struct sockaddr_in))
67 return;
68 sin = (const struct sockaddr_in *)sa;
69 rsa->sa_family = CLOUDABI_AF_INET;
70 memcpy(&rsa->sa_inet.addr, &sin->sin_addr,
71 sizeof(rsa->sa_inet.addr));
72 rsa->sa_inet.port = ntohs(sin->sin_port);
73 return;
74 case AF_INET6:
75 if (sal < sizeof(struct sockaddr_in6))
76 return;
77 sin6 = (const struct sockaddr_in6 *)sa;
78 rsa->sa_family = CLOUDABI_AF_INET6;
79 memcpy(&rsa->sa_inet6.addr, &sin6->sin6_addr,
80 sizeof(rsa->sa_inet6.addr));
81 rsa->sa_inet6.port = ntohs(sin6->sin6_port);
82 return;
83 case AF_UNIX:
84 rsa->sa_family = CLOUDABI_AF_UNIX;
85 return;
86 }
87 }
88
89 /* Copies a pathname into a UNIX socket address structure. */
90 static int
91 copyin_sockaddr_un(const char *path, size_t pathlen, struct sockaddr_un *sun)
92 {
93 int error;
94
95 /* Copy in pathname string if there's enough space. */
96 if (pathlen >= sizeof(sun->sun_path))
97 return (ENAMETOOLONG);
98 error = copyin(path, &sun->sun_path, pathlen);
99 if (error != 0)
100 return (error);
101 if (memchr(sun->sun_path, '\0', pathlen) != NULL)
102 return (EINVAL);
103
104 /* Initialize the rest of the socket address. */
105 sun->sun_path[pathlen] = '\0';
106 sun->sun_family = AF_UNIX;
107 sun->sun_len = sizeof(*sun);
108 return (0);
109 }
110
111 int
112 cloudabi_sys_sock_accept(struct thread *td,
113 struct cloudabi_sys_sock_accept_args *uap)
114 {
115 struct sockaddr *sa;
116 cloudabi_sockstat_t ss = {};
117 socklen_t sal;
118 int error;
119
120 if (uap->buf == NULL) {
121 /* Only return the new file descriptor number. */
122 return (kern_accept(td, uap->sock, NULL, NULL, NULL));
123 } else {
124 /* Also return properties of the new socket descriptor. */
125 sal = MAX(sizeof(struct sockaddr_in),
126 sizeof(struct sockaddr_in6));
127 error = kern_accept(td, uap->sock, (void *)&sa, &sal, NULL);
128 if (error != 0)
129 return (error);
130
131 /* TODO(ed): Fill the other members of cloudabi_sockstat_t. */
132 cloudabi_convert_sockaddr(sa, sal, &ss.ss_peername);
133 free(sa, M_SONAME);
134 return (copyout(&ss, uap->buf, sizeof(ss)));
135 }
136 }
137
138 int
139 cloudabi_sys_sock_bind(struct thread *td,
140 struct cloudabi_sys_sock_bind_args *uap)
141 {
142 struct sockaddr_un sun;
143 int error;
144
145 error = copyin_sockaddr_un(uap->path, uap->path_len, &sun);
146 if (error != 0)
147 return (error);
148 return (kern_bindat(td, uap->fd, uap->sock, (struct sockaddr *)&sun));
149 }
150
151 int
152 cloudabi_sys_sock_connect(struct thread *td,
153 struct cloudabi_sys_sock_connect_args *uap)
154 {
155 struct sockaddr_un sun;
156 int error;
157
158 error = copyin_sockaddr_un(uap->path, uap->path_len, &sun);
159 if (error != 0)
160 return (error);
161 return (kern_connectat(td, uap->fd, uap->sock,
162 (struct sockaddr *)&sun));
163 }
164
165 int
166 cloudabi_sys_sock_listen(struct thread *td,
167 struct cloudabi_sys_sock_listen_args *uap)
168 {
169
170 return (kern_listen(td, uap->sock, uap->backlog));
171 }
172
173 int
174 cloudabi_sys_sock_shutdown(struct thread *td,
175 struct cloudabi_sys_sock_shutdown_args *uap)
176 {
177 int how;
178
179 switch (uap->how) {
180 case CLOUDABI_SHUT_RD:
181 how = SHUT_RD;
182 break;
183 case CLOUDABI_SHUT_WR:
184 how = SHUT_WR;
185 break;
186 case CLOUDABI_SHUT_RD | CLOUDABI_SHUT_WR:
187 how = SHUT_RDWR;
188 break;
189 default:
190 return (EINVAL);
191 }
192
193 return (kern_shutdown(td, uap->sock, how));
194 }
195
196 int
197 cloudabi_sys_sock_stat_get(struct thread *td,
198 struct cloudabi_sys_sock_stat_get_args *uap)
199 {
200 cloudabi_sockstat_t ss = {};
201 cap_rights_t rights;
202 struct file *fp;
203 struct sockaddr *sa;
204 struct socket *so;
205 int error;
206
207 error = getsock_cap(td, uap->sock, cap_rights_init(&rights,
208 CAP_GETSOCKOPT, CAP_GETPEERNAME, CAP_GETSOCKNAME), &fp, NULL, NULL);
209 if (error != 0)
210 return (error);
211 so = fp->f_data;
212
213 CURVNET_SET(so->so_vnet);
214
215 /* Set ss_sockname. */
216 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
217 if (error == 0) {
218 cloudabi_convert_sockaddr(sa, sa->sa_len, &ss.ss_sockname);
219 free(sa, M_SONAME);
220 }
221
222 /* Set ss_peername. */
223 if ((so->so_state & (SS_ISCONNECTED | SS_ISCONFIRMING)) != 0) {
224 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa);
225 if (error == 0) {
226 cloudabi_convert_sockaddr(sa, sa->sa_len,
227 &ss.ss_peername);
228 free(sa, M_SONAME);
229 }
230 }
231
232 CURVNET_RESTORE();
233
234 /* Set ss_error. */
235 SOCK_LOCK(so);
236 ss.ss_error = cloudabi_convert_errno(so->so_error);
237 if ((uap->flags & CLOUDABI_SOCKSTAT_CLEAR_ERROR) != 0)
238 so->so_error = 0;
239 SOCK_UNLOCK(so);
240
241 /* Set ss_state. */
242 if ((so->so_options & SO_ACCEPTCONN) != 0)
243 ss.ss_state |= CLOUDABI_SOCKSTATE_ACCEPTCONN;
244
245 fdrop(fp, td);
246 return (copyout(&ss, uap->buf, sizeof(ss)));
247 }
248
249 int
250 cloudabi_sock_recv(struct thread *td, cloudabi_fd_t fd, struct iovec *data,
251 size_t datalen, cloudabi_fd_t *fds, size_t fdslen,
252 cloudabi_msgflags_t flags, size_t *rdatalen, size_t *rfdslen,
253 cloudabi_sockaddr_t *peername, cloudabi_msgflags_t *rflags)
254 {
255 struct sockaddr_storage ss;
256 struct msghdr hdr = {
257 .msg_name = &ss,
258 .msg_namelen = sizeof(ss),
259 .msg_iov = data,
260 .msg_iovlen = datalen,
261 };
262 struct mbuf *control;
263 int error;
264
265 /* Convert flags. */
266 if (flags & CLOUDABI_MSG_PEEK)
267 hdr.msg_flags |= MSG_PEEK;
268 if (flags & CLOUDABI_MSG_WAITALL)
269 hdr.msg_flags |= MSG_WAITALL;
270
271 control = NULL;
272 error = kern_recvit(td, fd, &hdr, UIO_SYSSPACE,
273 fdslen > 0 ? &control : NULL);
274 if (error != 0)
275 return (error);
276
277 /* Convert return values. */
278 *rdatalen = td->td_retval[0];
279 td->td_retval[0] = 0;
280 *rfdslen = 0;
281 cloudabi_convert_sockaddr((struct sockaddr *)&ss,
282 MIN(hdr.msg_namelen, sizeof(ss)), peername);
283 *rflags = 0;
284 if (hdr.msg_flags & MSG_EOR)
285 *rflags |= CLOUDABI_MSG_EOR;
286 if (hdr.msg_flags & MSG_TRUNC)
287 *rflags |= CLOUDABI_MSG_TRUNC;
288
289 /* Extract file descriptors from SCM_RIGHTS messages. */
290 if (control != NULL) {
291 struct cmsghdr *chdr;
292
293 hdr.msg_control = mtod(control, void *);
294 hdr.msg_controllen = control->m_len;
295 for (chdr = CMSG_FIRSTHDR(&hdr); chdr != NULL;
296 chdr = CMSG_NXTHDR(&hdr, chdr)) {
297 if (chdr->cmsg_level == SOL_SOCKET &&
298 chdr->cmsg_type == SCM_RIGHTS) {
299 size_t nfds;
300
301 nfds = (chdr->cmsg_len - CMSG_LEN(0)) /
302 sizeof(int);
303 if (nfds > fdslen) {
304 /* Unable to store file descriptors. */
305 nfds = fdslen;
306 *rflags |= CLOUDABI_MSG_CTRUNC;
307 }
308 error = copyout(CMSG_DATA(chdr), fds,
309 nfds * sizeof(int));
310 if (error != 0) {
311 m_free(control);
312 return (error);
313 }
314 fds += nfds;
315 fdslen -= nfds;
316 *rfdslen += nfds;
317 }
318 }
319 m_free(control);
320 }
321 return (0);
322 }
323
324 int
325 cloudabi_sock_send(struct thread *td, cloudabi_fd_t fd, struct iovec *data,
326 size_t datalen, const cloudabi_fd_t *fds, size_t fdslen,
327 cloudabi_msgflags_t flags, size_t *rdatalen)
328 {
329 struct msghdr hdr = {
330 .msg_iov = data,
331 .msg_iovlen = datalen,
332 };
333 struct mbuf *control;
334 int error, mflags;
335
336 /* Convert flags. */
337 mflags = MSG_NOSIGNAL;
338 if (flags & CLOUDABI_MSG_EOR)
339 mflags |= MSG_EOR;
340
341 /* Convert file descriptor array to an SCM_RIGHTS message. */
342 if (fdslen > MCLBYTES || CMSG_SPACE(fdslen * sizeof(int)) > MCLBYTES) {
343 return (EINVAL);
344 } else if (fdslen > 0) {
345 struct cmsghdr *chdr;
346
347 control = m_get2(CMSG_SPACE(fdslen * sizeof(int)),
348 M_WAITOK, MT_CONTROL, 0);
349 control->m_len = CMSG_SPACE(fdslen * sizeof(int));
350
351 chdr = mtod(control, struct cmsghdr *);
352 chdr->cmsg_len = CMSG_LEN(fdslen * sizeof(int));
353 chdr->cmsg_level = SOL_SOCKET;
354 chdr->cmsg_type = SCM_RIGHTS;
355 error = copyin(fds, CMSG_DATA(chdr), fdslen * sizeof(int));
356 if (error != 0) {
357 m_free(control);
358 return (error);
359 }
360 } else {
361 control = NULL;
362 }
363
364 error = kern_sendit(td, fd, &hdr, mflags, control, UIO_USERSPACE);
365 if (error != 0)
366 return (error);
367 *rdatalen = td->td_retval[0];
368 td->td_retval[0] = 0;
369 return (0);
370 }
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