Commit | Line | Data |
---|---|---|
8ae0e4b4 | 1 | /* |
5921352b | 2 | * Copyright (c) 1982, 1986, 1988, 1990 Regents of the University of California. |
2b6b6284 | 3 | * All rights reserved. |
8ae0e4b4 | 4 | * |
1c15e888 C |
5 | * Redistribution is only permitted until one year after the first shipment |
6 | * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and | |
7 | * binary forms are permitted provided that: (1) source distributions retain | |
8 | * this entire copyright notice and comment, and (2) distributions including | |
9 | * binaries display the following acknowledgement: This product includes | |
10 | * software developed by the University of California, Berkeley and its | |
11 | * contributors'' in the documentation or other materials provided with the | |
12 | * distribution and in all advertising materials mentioning features or use | |
13 | * of this software. Neither the name of the University nor the names of | |
14 | * its contributors may be used to endorse or promote products derived from | |
15 | * this software without specific prior written permission. | |
16 | * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED | |
17 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF | |
18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
2b6b6284 | 19 | * |
1c15e888 | 20 | * @(#)udp_usrreq.c 7.18 (Berkeley) 7/25/90 |
8ae0e4b4 | 21 | */ |
20666ad3 JB |
22 | |
23 | #include "param.h" | |
20666ad3 | 24 | #include "user.h" |
9d91b170 | 25 | #include "malloc.h" |
20666ad3 JB |
26 | #include "mbuf.h" |
27 | #include "protosw.h" | |
28 | #include "socket.h" | |
29 | #include "socketvar.h" | |
30 | #include "errno.h" | |
31 | #include "stat.h" | |
f4d55810 | 32 | |
72e4f44e | 33 | #include "../net/if.h" |
c124e997 | 34 | #include "../net/route.h" |
f4d55810 | 35 | |
20666ad3 | 36 | #include "in.h" |
20666ad3 JB |
37 | #include "in_systm.h" |
38 | #include "ip.h" | |
0dfbe263 | 39 | #include "in_pcb.h" |
20666ad3 JB |
40 | #include "ip_var.h" |
41 | #include "ip_icmp.h" | |
42 | #include "udp.h" | |
43 | #include "udp_var.h" | |
d52566dd | 44 | |
5921352b MK |
45 | struct inpcb *udp_last_inpcb = &udb; |
46 | ||
2b4b57cd BJ |
47 | /* |
48 | * UDP protocol implementation. | |
49 | * Per RFC 768, August, 1980. | |
50 | */ | |
d52566dd BJ |
51 | udp_init() |
52 | { | |
53 | ||
eb44bfb2 | 54 | udb.inp_next = udb.inp_prev = &udb; |
d52566dd | 55 | } |
1bd53abe | 56 | |
c50542f3 | 57 | #ifndef COMPAT_42 |
dd8707ae | 58 | int udpcksum = 1; |
c50542f3 MK |
59 | #else |
60 | int udpcksum = 0; /* XXX */ | |
61 | #endif | |
0eda4f11 | 62 | int udp_ttl = UDP_TTL; |
c50542f3 | 63 | |
5328bc49 | 64 | struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; |
eb44bfb2 | 65 | |
9d91b170 MK |
66 | udp_input(m, iphlen) |
67 | register struct mbuf *m; | |
68 | int iphlen; | |
1bd53abe | 69 | { |
0dfbe263 MK |
70 | register struct ip *ip; |
71 | register struct udphdr *uh; | |
53a5409e | 72 | register struct inpcb *inp; |
5921352b | 73 | struct mbuf *opts = 0; |
e199a8a5 | 74 | int len; |
0dfbe263 | 75 | struct ip save_ip; |
eb44bfb2 | 76 | |
5921352b | 77 | udpstat.udps_ipackets++; |
9f5c260d MK |
78 | |
79 | /* | |
80 | * Strip IP options, if any; should skip this, | |
81 | * make available to user, and use on returned packets, | |
82 | * but we don't yet have a way to check the checksum | |
83 | * with options still present. | |
84 | */ | |
85 | if (iphlen > sizeof (struct ip)) { | |
0dfbe263 | 86 | ip_stripoptions(m, (struct mbuf *)0); |
9f5c260d MK |
87 | iphlen = sizeof(struct ip); |
88 | } | |
89 | ||
2b4b57cd | 90 | /* |
4aed14e3 | 91 | * Get IP and UDP header together in first mbuf. |
2b4b57cd | 92 | */ |
0dfbe263 MK |
93 | ip = mtod(m, struct ip *); |
94 | if (m->m_len < iphlen + sizeof(struct udphdr)) { | |
95 | if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { | |
7212ba67 MK |
96 | udpstat.udps_hdrops++; |
97 | return; | |
98 | } | |
0dfbe263 | 99 | ip = mtod(m, struct ip *); |
7212ba67 | 100 | } |
0dfbe263 | 101 | uh = (struct udphdr *)((caddr_t)ip + iphlen); |
2b4b57cd BJ |
102 | |
103 | /* | |
4aed14e3 BJ |
104 | * Make mbuf data length reflect UDP length. |
105 | * If not enough data to reflect UDP length, drop. | |
2b4b57cd | 106 | */ |
0dfbe263 MK |
107 | len = ntohs((u_short)uh->uh_ulen); |
108 | if (ip->ip_len != len) { | |
109 | if (len > ip->ip_len) { | |
2b4b57cd BJ |
110 | udpstat.udps_badlen++; |
111 | goto bad; | |
112 | } | |
0dfbe263 MK |
113 | m_adj(m, len - ip->ip_len); |
114 | /* ip->ip_len = len; */ | |
2b4b57cd | 115 | } |
dcea2497 | 116 | /* |
0dfbe263 MK |
117 | * Save a copy of the IP header in case we want restore it |
118 | * for sending an ICMP error message in response. | |
dcea2497 | 119 | */ |
0dfbe263 | 120 | save_ip = *ip; |
2b4b57cd BJ |
121 | |
122 | /* | |
4aed14e3 | 123 | * Checksum extended UDP header and data. |
2b4b57cd | 124 | */ |
0dfbe263 MK |
125 | if (udpcksum && uh->uh_sum) { |
126 | ((struct ipovly *)ip)->ih_next = 0; | |
127 | ((struct ipovly *)ip)->ih_prev = 0; | |
128 | ((struct ipovly *)ip)->ih_x1 = 0; | |
129 | ((struct ipovly *)ip)->ih_len = uh->uh_ulen; | |
130 | if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) { | |
2b4b57cd | 131 | udpstat.udps_badsum++; |
eb44bfb2 BJ |
132 | m_freem(m); |
133 | return; | |
134 | } | |
135 | } | |
2b4b57cd BJ |
136 | |
137 | /* | |
e199a8a5 | 138 | * Locate pcb for datagram. |
2b4b57cd | 139 | */ |
5921352b MK |
140 | inp = udp_last_inpcb; |
141 | if (inp->inp_lport != uh->uh_dport || | |
142 | inp->inp_fport != uh->uh_sport || | |
143 | inp->inp_faddr.s_addr != ip->ip_src.s_addr || | |
144 | inp->inp_laddr.s_addr != ip->ip_dst.s_addr) { | |
145 | inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport, | |
146 | ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD); | |
147 | if (inp) | |
148 | udp_last_inpcb = inp; | |
149 | udpstat.udpps_pcbcachemiss++; | |
150 | } | |
72e4f44e | 151 | if (inp == 0) { |
5cdc4d65 | 152 | /* don't send ICMP response for broadcast packet */ |
0dfbe263 | 153 | udpstat.udps_noport++; |
5921352b MK |
154 | if (m->m_flags & M_BCAST) { |
155 | udpstat.udps_noportbcast++; | |
72e4f44e | 156 | goto bad; |
5921352b | 157 | } |
0dfbe263 | 158 | *ip = save_ip; |
9f5c260d | 159 | ip->ip_len += iphlen; |
9d91b170 | 160 | icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT); |
72e4f44e SL |
161 | return; |
162 | } | |
2b4b57cd BJ |
163 | |
164 | /* | |
165 | * Construct sockaddr format source address. | |
166 | * Stuff source address and datagram in user buffer. | |
167 | */ | |
0dfbe263 MK |
168 | udp_in.sin_port = uh->uh_sport; |
169 | udp_in.sin_addr = ip->ip_src; | |
5921352b MK |
170 | if (inp->inp_flags & INP_CONTROLOPTS) { |
171 | struct mbuf **mp = &opts; | |
172 | struct mbuf *udp_saveopt(); | |
173 | ||
174 | if (inp->inp_flags & INP_RECVDSTADDR) { | |
175 | *mp = udp_saveopt((caddr_t) &ip->ip_dst, | |
176 | sizeof(struct in_addr), IP_RECVDSTADDR); | |
177 | if (*mp) | |
178 | mp = &(*mp)->m_next; | |
179 | } | |
180 | #ifdef notyet | |
181 | /* options were tossed above */ | |
182 | if (inp->inp_flags & INP_RECVOPTS) { | |
183 | *mp = udp_saveopt((caddr_t) opts_deleted_above, | |
184 | sizeof(struct in_addr), IP_RECVOPTS); | |
185 | if (*mp) | |
186 | mp = &(*mp)->m_next; | |
187 | } | |
188 | /* ip_srcroute doesn't do what we want here, need to fix */ | |
189 | if (inp->inp_flags & INP_RECVRETOPTS) { | |
190 | *mp = udp_saveopt((caddr_t) ip_srcroute(), | |
191 | sizeof(struct in_addr), IP_RECVRETOPTS); | |
192 | if (*mp) | |
193 | mp = &(*mp)->m_next; | |
194 | } | |
195 | #endif | |
196 | } | |
0dfbe263 MK |
197 | iphlen += sizeof(struct udphdr); |
198 | m->m_len -= iphlen; | |
199 | m->m_pkthdr.len -= iphlen; | |
200 | m->m_data += iphlen; | |
ab85b059 | 201 | if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in, |
5921352b MK |
202 | m, opts) == 0) { |
203 | udpstat.udps_fullsock++; | |
2b4b57cd | 204 | goto bad; |
5921352b | 205 | } |
4e60622a | 206 | sorwakeup(inp->inp_socket); |
53a5409e | 207 | return; |
2b4b57cd | 208 | bad: |
53a5409e | 209 | m_freem(m); |
5921352b MK |
210 | if (opts) |
211 | m_freem(opts); | |
212 | } | |
213 | ||
214 | /* | |
215 | * Create a "control" mbuf containing the specified data | |
216 | * with the specified type for presentation with a datagram. | |
217 | */ | |
218 | struct mbuf * | |
219 | udp_saveopt(p, size, type) | |
220 | caddr_t p; | |
221 | register int size; | |
222 | int type; | |
223 | { | |
224 | register struct cmsghdr *cp; | |
225 | struct mbuf *m; | |
226 | ||
227 | if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL) | |
228 | return ((struct mbuf *) NULL); | |
229 | cp = (struct cmsghdr *) mtod(m, struct cmsghdr *); | |
1c15e888 | 230 | bcopy(p, (caddr_t)cp + size, size); |
5921352b MK |
231 | size += sizeof(*cp); |
232 | m->m_len = size; | |
233 | cp->cmsg_len = size; | |
234 | cp->cmsg_level = IPPROTO_IP; | |
235 | cp->cmsg_type = type; | |
236 | return (m); | |
1bd53abe BJ |
237 | } |
238 | ||
41715710 MK |
239 | /* |
240 | * Notify a udp user of an asynchronous error; | |
241 | * just wake up so that he can collect error status. | |
242 | */ | |
5921352b | 243 | udp_notify(inp, errno) |
41715710 MK |
244 | register struct inpcb *inp; |
245 | { | |
246 | ||
5921352b | 247 | inp->inp_socket->so_error = errno; |
41715710 MK |
248 | sorwakeup(inp->inp_socket); |
249 | sowwakeup(inp->inp_socket); | |
250 | } | |
251 | ||
0dfbe263 | 252 | udp_ctlinput(cmd, sa, ip) |
39674d5f | 253 | int cmd; |
dcea2497 | 254 | struct sockaddr *sa; |
0dfbe263 | 255 | register struct ip *ip; |
39674d5f | 256 | { |
0dfbe263 MK |
257 | register struct udphdr *uh; |
258 | extern struct in_addr zeroin_addr; | |
39674d5f | 259 | extern u_char inetctlerrmap[]; |
39674d5f | 260 | |
0dfbe263 | 261 | if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0) |
dcea2497 | 262 | return; |
0dfbe263 MK |
263 | if (ip) { |
264 | uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); | |
265 | in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport, | |
266 | cmd, udp_notify); | |
267 | } else | |
268 | in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); | |
39674d5f SL |
269 | } |
270 | ||
a942fe02 | 271 | udp_output(inp, m, addr, control) |
d55475b1 | 272 | register struct inpcb *inp; |
2b4b57cd | 273 | register struct mbuf *m; |
a942fe02 | 274 | struct mbuf *addr, *control; |
9d91b170 | 275 | { |
2b4b57cd | 276 | register struct udpiphdr *ui; |
9d91b170 | 277 | register int len = m->m_pkthdr.len; |
a942fe02 MK |
278 | struct in_addr laddr; |
279 | int s, error = 0; | |
2b4b57cd | 280 | |
a942fe02 MK |
281 | if (control) |
282 | m_freem(control); /* XXX */ | |
283 | ||
284 | if (addr) { | |
285 | laddr = inp->inp_laddr; | |
286 | if (inp->inp_faddr.s_addr != INADDR_ANY) { | |
287 | error = EISCONN; | |
288 | goto release; | |
289 | } | |
290 | /* | |
291 | * Must block input while temporarily connected. | |
292 | */ | |
293 | s = splnet(); | |
294 | error = in_pcbconnect(inp, addr); | |
295 | if (error) { | |
296 | splx(s); | |
297 | goto release; | |
298 | } | |
299 | } else { | |
300 | if (inp->inp_faddr.s_addr == INADDR_ANY) { | |
301 | error = ENOTCONN; | |
302 | goto release; | |
303 | } | |
304 | } | |
2b4b57cd BJ |
305 | /* |
306 | * Calculate data length and get a mbuf | |
4aed14e3 | 307 | * for UDP and IP headers. |
2b4b57cd | 308 | */ |
9d91b170 | 309 | M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT); |
2b4b57cd BJ |
310 | |
311 | /* | |
4aed14e3 | 312 | * Fill in mbuf with extended UDP header |
2b4b57cd BJ |
313 | * and addresses and length put into network format. |
314 | */ | |
2b4b57cd BJ |
315 | ui = mtod(m, struct udpiphdr *); |
316 | ui->ui_next = ui->ui_prev = 0; | |
317 | ui->ui_x1 = 0; | |
318 | ui->ui_pr = IPPROTO_UDP; | |
ee847abd | 319 | ui->ui_len = htons((u_short)len + sizeof (struct udphdr)); |
4e60622a BJ |
320 | ui->ui_src = inp->inp_laddr; |
321 | ui->ui_dst = inp->inp_faddr; | |
322 | ui->ui_sport = inp->inp_lport; | |
323 | ui->ui_dport = inp->inp_fport; | |
ee847abd | 324 | ui->ui_ulen = ui->ui_len; |
2b4b57cd BJ |
325 | |
326 | /* | |
327 | * Stuff checksum and output datagram. | |
328 | */ | |
329 | ui->ui_sum = 0; | |
dd8707ae MK |
330 | if (udpcksum) { |
331 | if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0) | |
890024da | 332 | ui->ui_sum = 0xffff; |
ee09448f | 333 | } |
4e60622a | 334 | ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; |
5921352b MK |
335 | ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ |
336 | ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ | |
0dfbe263 | 337 | udpstat.udps_opackets++; |
a942fe02 MK |
338 | error = ip_output(m, inp->inp_options, &inp->inp_route, |
339 | inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)); | |
340 | ||
341 | if (addr) { | |
342 | in_pcbdisconnect(inp); | |
343 | inp->inp_laddr = laddr; | |
344 | splx(s); | |
345 | } | |
346 | return (error); | |
347 | ||
348 | release: | |
349 | m_freem(m); | |
350 | return (error); | |
1bd53abe BJ |
351 | } |
352 | ||
c9209cff KM |
353 | u_long udp_sendspace = 9216; /* really max datagram size */ |
354 | u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); | |
355 | /* 40 1K datagrams */ | |
1d14d351 | 356 | |
a8d3bf7f | 357 | /*ARGSUSED*/ |
a942fe02 | 358 | udp_usrreq(so, req, m, addr, control) |
53a5409e | 359 | struct socket *so; |
1bd53abe | 360 | int req; |
a942fe02 | 361 | struct mbuf *m, *addr, *control; |
1bd53abe | 362 | { |
53a5409e | 363 | struct inpcb *inp = sotoinpcb(so); |
8a2f82db | 364 | int error = 0; |
5921352b | 365 | int s; |
1bd53abe | 366 | |
1d14d351 | 367 | if (req == PRU_CONTROL) |
a942fe02 | 368 | return (in_control(so, (int)m, (caddr_t)addr, |
0dfbe263 | 369 | (struct ifnet *)control)); |
a3fa431a SL |
370 | if (inp == NULL && req != PRU_ATTACH) { |
371 | error = EINVAL; | |
372 | goto release; | |
373 | } | |
5921352b | 374 | /* |
a44aeee3 MK |
375 | * Note: need to block udp_input while changing |
376 | * the udp pcb queue and/or pcb addresses. | |
5921352b | 377 | */ |
1bd53abe BJ |
378 | switch (req) { |
379 | ||
380 | case PRU_ATTACH: | |
a3fa431a SL |
381 | if (inp != NULL) { |
382 | error = EINVAL; | |
383 | break; | |
384 | } | |
5921352b | 385 | s = splnet(); |
8075bb0e | 386 | error = in_pcballoc(so, &udb); |
5921352b | 387 | splx(s); |
8075bb0e BJ |
388 | if (error) |
389 | break; | |
1d14d351 | 390 | error = soreserve(so, udp_sendspace, udp_recvspace); |
8075bb0e BJ |
391 | if (error) |
392 | break; | |
5921352b | 393 | ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl; |
53a5409e | 394 | break; |
1bd53abe BJ |
395 | |
396 | case PRU_DETACH: | |
a44aeee3 | 397 | udp_detach(inp); |
53a5409e | 398 | break; |
1bd53abe | 399 | |
8075bb0e | 400 | case PRU_BIND: |
a44aeee3 | 401 | s = splnet(); |
a942fe02 | 402 | error = in_pcbbind(inp, addr); |
a44aeee3 | 403 | splx(s); |
8075bb0e BJ |
404 | break; |
405 | ||
406 | case PRU_LISTEN: | |
407 | error = EOPNOTSUPP; | |
408 | break; | |
409 | ||
1bd53abe | 410 | case PRU_CONNECT: |
a3fa431a SL |
411 | if (inp->inp_faddr.s_addr != INADDR_ANY) { |
412 | error = EISCONN; | |
413 | break; | |
414 | } | |
a44aeee3 | 415 | s = splnet(); |
a942fe02 | 416 | error = in_pcbconnect(inp, addr); |
a44aeee3 | 417 | splx(s); |
8a2f82db SL |
418 | if (error == 0) |
419 | soisconnected(so); | |
1bd53abe BJ |
420 | break; |
421 | ||
4945768c SL |
422 | case PRU_CONNECT2: |
423 | error = EOPNOTSUPP; | |
424 | break; | |
425 | ||
2b4b57cd | 426 | case PRU_ACCEPT: |
a3fa431a SL |
427 | error = EOPNOTSUPP; |
428 | break; | |
2b4b57cd | 429 | |
53a5409e | 430 | case PRU_DISCONNECT: |
a3fa431a SL |
431 | if (inp->inp_faddr.s_addr == INADDR_ANY) { |
432 | error = ENOTCONN; | |
433 | break; | |
434 | } | |
a44aeee3 | 435 | s = splnet(); |
405c9168 | 436 | in_pcbdisconnect(inp); |
0dfbe263 | 437 | inp->inp_laddr.s_addr = INADDR_ANY; |
a44aeee3 | 438 | splx(s); |
f96a0781 | 439 | so->so_state &= ~SS_ISCONNECTED; /* XXX */ |
1bd53abe BJ |
440 | break; |
441 | ||
cdad2eb1 BJ |
442 | case PRU_SHUTDOWN: |
443 | socantsendmore(so); | |
444 | break; | |
445 | ||
a942fe02 | 446 | case PRU_SEND: |
5921352b | 447 | return (udp_output(inp, m, addr, control)); |
1bd53abe BJ |
448 | |
449 | case PRU_ABORT: | |
53a5409e | 450 | soisdisconnected(so); |
a44aeee3 | 451 | udp_detach(inp); |
1bd53abe BJ |
452 | break; |
453 | ||
126472ab | 454 | case PRU_SOCKADDR: |
a942fe02 | 455 | in_setsockaddr(inp, addr); |
126472ab SL |
456 | break; |
457 | ||
a7343092 | 458 | case PRU_PEERADDR: |
a942fe02 | 459 | in_setpeeraddr(inp, addr); |
a7343092 SL |
460 | break; |
461 | ||
74040e68 MK |
462 | case PRU_SENSE: |
463 | /* | |
464 | * stat: don't bother with a blocksize. | |
465 | */ | |
466 | return (0); | |
467 | ||
11d2a668 SL |
468 | case PRU_SENDOOB: |
469 | case PRU_FASTTIMO: | |
470 | case PRU_SLOWTIMO: | |
471 | case PRU_PROTORCV: | |
472 | case PRU_PROTOSEND: | |
473 | error = EOPNOTSUPP; | |
474 | break; | |
4945768c | 475 | |
5f55b8b5 MK |
476 | case PRU_RCVD: |
477 | case PRU_RCVOOB: | |
478 | return (EOPNOTSUPP); /* do not free mbuf's */ | |
479 | ||
4945768c SL |
480 | default: |
481 | panic("udp_usrreq"); | |
d52566dd | 482 | } |
5921352b | 483 | |
a3fa431a | 484 | release: |
a942fe02 MK |
485 | if (control) { |
486 | printf("udp control data unexpectedly retained\n"); | |
487 | m_freem(control); | |
488 | } | |
489 | if (m) | |
a3fa431a | 490 | m_freem(m); |
8a2f82db | 491 | return (error); |
d52566dd | 492 | } |
a44aeee3 MK |
493 | |
494 | udp_detach(inp) | |
495 | struct inpcb *inp; | |
496 | { | |
497 | int s = splnet(); | |
498 | ||
499 | if (inp == udp_last_inpcb) | |
500 | udp_last_inpcb = &udb; | |
501 | in_pcbdetach(inp); | |
502 | splx(s); | |
503 | } |