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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986, 1988 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
38e82238 | 33 | * from: @(#)tcp_usrreq.c 7.15 (Berkeley) 6/28/90 |
fde1aeb2 | 34 | * $Id: tcp_usrreq.c,v 1.3 1993/11/25 01:35:20 wollman Exp $ |
15637ed4 RG |
35 | */ |
36 | ||
37 | #include "param.h" | |
38 | #include "systm.h" | |
39 | #include "malloc.h" | |
40 | #include "mbuf.h" | |
41 | #include "socket.h" | |
42 | #include "socketvar.h" | |
43 | #include "protosw.h" | |
44 | #include "errno.h" | |
45 | #include "stat.h" | |
46 | ||
47 | #include "../net/if.h" | |
48 | #include "../net/route.h" | |
49 | ||
50 | #include "in.h" | |
51 | #include "in_systm.h" | |
52 | #include "ip.h" | |
53 | #include "in_pcb.h" | |
54 | #include "ip_var.h" | |
55 | #include "tcp.h" | |
56 | #include "tcp_fsm.h" | |
57 | #include "tcp_seq.h" | |
58 | #include "tcp_timer.h" | |
59 | #include "tcp_var.h" | |
60 | #include "tcpip.h" | |
61 | #include "tcp_debug.h" | |
62 | ||
63 | /* | |
64 | * TCP protocol interface to socket abstraction. | |
65 | */ | |
66 | extern char *tcpstates[]; | |
15637ed4 RG |
67 | |
68 | /* | |
69 | * Process a TCP user request for TCP tb. If this is a send request | |
70 | * then m is the mbuf chain of send data. If this is a timer expiration | |
71 | * (called from the software clock routine), then timertype tells which timer. | |
72 | */ | |
73 | /*ARGSUSED*/ | |
4c45483e | 74 | int |
fde1aeb2 | 75 | tcp_usrreq(so, req, m, nam, control, dummy) |
15637ed4 RG |
76 | struct socket *so; |
77 | int req; | |
78 | struct mbuf *m, *nam, *control; | |
fde1aeb2 | 79 | struct mbuf *dummy; |
15637ed4 RG |
80 | { |
81 | register struct inpcb *inp; | |
4c45483e | 82 | register struct tcpcb *tp = 0; |
15637ed4 RG |
83 | int s; |
84 | int error = 0; | |
85 | int ostate; | |
86 | ||
87 | if (req == PRU_CONTROL) | |
88 | return (in_control(so, (int)m, (caddr_t)nam, | |
89 | (struct ifnet *)control)); | |
90 | if (control && control->m_len) { | |
91 | m_freem(control); | |
92 | if (m) | |
93 | m_freem(m); | |
94 | return (EINVAL); | |
95 | } | |
96 | ||
97 | s = splnet(); | |
98 | inp = sotoinpcb(so); | |
99 | /* | |
100 | * When a TCP is attached to a socket, then there will be | |
101 | * a (struct inpcb) pointed at by the socket, and this | |
102 | * structure will point at a subsidary (struct tcpcb). | |
103 | */ | |
104 | if (inp == 0 && req != PRU_ATTACH) { | |
105 | splx(s); | |
106 | return (EINVAL); /* XXX */ | |
107 | } | |
108 | if (inp) { | |
109 | tp = intotcpcb(inp); | |
110 | /* WHAT IF TP IS 0? */ | |
111 | #ifdef KPROF | |
112 | tcp_acounts[tp->t_state][req]++; | |
113 | #endif | |
114 | ostate = tp->t_state; | |
115 | } else | |
116 | ostate = 0; | |
117 | switch (req) { | |
118 | ||
119 | /* | |
120 | * TCP attaches to socket via PRU_ATTACH, reserving space, | |
121 | * and an internet control block. | |
122 | */ | |
123 | case PRU_ATTACH: | |
124 | if (inp) { | |
125 | error = EISCONN; | |
126 | break; | |
127 | } | |
128 | error = tcp_attach(so); | |
129 | if (error) | |
130 | break; | |
131 | if ((so->so_options & SO_LINGER) && so->so_linger == 0) | |
132 | so->so_linger = TCP_LINGERTIME; | |
133 | tp = sototcpcb(so); | |
134 | break; | |
135 | ||
136 | /* | |
137 | * PRU_DETACH detaches the TCP protocol from the socket. | |
138 | * If the protocol state is non-embryonic, then can't | |
139 | * do this directly: have to initiate a PRU_DISCONNECT, | |
140 | * which may finish later; embryonic TCB's can just | |
141 | * be discarded here. | |
142 | */ | |
143 | case PRU_DETACH: | |
144 | if (tp->t_state > TCPS_LISTEN) | |
145 | tp = tcp_disconnect(tp); | |
146 | else | |
147 | tp = tcp_close(tp); | |
148 | break; | |
149 | ||
150 | /* | |
151 | * Give the socket an address. | |
152 | */ | |
153 | case PRU_BIND: | |
154 | error = in_pcbbind(inp, nam); | |
155 | if (error) | |
156 | break; | |
157 | break; | |
158 | ||
159 | /* | |
160 | * Prepare to accept connections. | |
161 | */ | |
162 | case PRU_LISTEN: | |
163 | if (inp->inp_lport == 0) | |
164 | error = in_pcbbind(inp, (struct mbuf *)0); | |
165 | if (error == 0) | |
166 | tp->t_state = TCPS_LISTEN; | |
167 | break; | |
168 | ||
169 | /* | |
170 | * Initiate connection to peer. | |
171 | * Create a template for use in transmissions on this connection. | |
172 | * Enter SYN_SENT state, and mark socket as connecting. | |
173 | * Start keep-alive timer, and seed output sequence space. | |
174 | * Send initial segment on connection. | |
175 | */ | |
176 | case PRU_CONNECT: | |
177 | if (inp->inp_lport == 0) { | |
178 | error = in_pcbbind(inp, (struct mbuf *)0); | |
179 | if (error) | |
180 | break; | |
181 | } | |
182 | error = in_pcbconnect(inp, nam); | |
183 | if (error) | |
184 | break; | |
185 | tp->t_template = tcp_template(tp); | |
186 | if (tp->t_template == 0) { | |
187 | in_pcbdisconnect(inp); | |
188 | error = ENOBUFS; | |
189 | break; | |
190 | } | |
191 | soisconnecting(so); | |
192 | tcpstat.tcps_connattempt++; | |
193 | tp->t_state = TCPS_SYN_SENT; | |
194 | tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT; | |
195 | tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2; | |
196 | tcp_sendseqinit(tp); | |
197 | error = tcp_output(tp); | |
198 | break; | |
199 | ||
200 | /* | |
201 | * Create a TCP connection between two sockets. | |
202 | */ | |
203 | case PRU_CONNECT2: | |
204 | error = EOPNOTSUPP; | |
205 | break; | |
206 | ||
207 | /* | |
208 | * Initiate disconnect from peer. | |
209 | * If connection never passed embryonic stage, just drop; | |
210 | * else if don't need to let data drain, then can just drop anyways, | |
211 | * else have to begin TCP shutdown process: mark socket disconnecting, | |
212 | * drain unread data, state switch to reflect user close, and | |
213 | * send segment (e.g. FIN) to peer. Socket will be really disconnected | |
214 | * when peer sends FIN and acks ours. | |
215 | * | |
216 | * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. | |
217 | */ | |
218 | case PRU_DISCONNECT: | |
219 | tp = tcp_disconnect(tp); | |
220 | break; | |
221 | ||
222 | /* | |
223 | * Accept a connection. Essentially all the work is | |
224 | * done at higher levels; just return the address | |
225 | * of the peer, storing through addr. | |
226 | */ | |
227 | case PRU_ACCEPT: { | |
228 | struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); | |
229 | ||
230 | nam->m_len = sizeof (struct sockaddr_in); | |
231 | sin->sin_family = AF_INET; | |
232 | sin->sin_len = sizeof(*sin); | |
233 | sin->sin_port = inp->inp_fport; | |
234 | sin->sin_addr = inp->inp_faddr; | |
235 | break; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Mark the connection as being incapable of further output. | |
240 | */ | |
241 | case PRU_SHUTDOWN: | |
242 | socantsendmore(so); | |
243 | tp = tcp_usrclosed(tp); | |
244 | if (tp) | |
245 | error = tcp_output(tp); | |
246 | break; | |
247 | ||
248 | /* | |
249 | * After a receive, possibly send window update to peer. | |
250 | */ | |
251 | case PRU_RCVD: | |
252 | (void) tcp_output(tp); | |
253 | break; | |
254 | ||
255 | /* | |
256 | * Do a send by putting data in output queue and updating urgent | |
257 | * marker if URG set. Possibly send more data. | |
258 | */ | |
259 | case PRU_SEND: | |
260 | sbappend(&so->so_snd, m); | |
261 | error = tcp_output(tp); | |
262 | break; | |
263 | ||
264 | /* | |
265 | * Abort the TCP. | |
266 | */ | |
267 | case PRU_ABORT: | |
268 | tp = tcp_drop(tp, ECONNABORTED); | |
269 | break; | |
270 | ||
271 | case PRU_SENSE: | |
272 | ((struct stat *) m)->st_blksize = so->so_snd.sb_hiwat; | |
273 | (void) splx(s); | |
274 | return (0); | |
275 | ||
276 | case PRU_RCVOOB: | |
277 | if ((so->so_oobmark == 0 && | |
278 | (so->so_state & SS_RCVATMARK) == 0) || | |
279 | so->so_options & SO_OOBINLINE || | |
280 | tp->t_oobflags & TCPOOB_HADDATA) { | |
281 | error = EINVAL; | |
282 | break; | |
283 | } | |
284 | if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { | |
285 | error = EWOULDBLOCK; | |
286 | break; | |
287 | } | |
288 | m->m_len = 1; | |
289 | *mtod(m, caddr_t) = tp->t_iobc; | |
290 | if (((int)nam & MSG_PEEK) == 0) | |
291 | tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); | |
292 | break; | |
293 | ||
294 | case PRU_SENDOOB: | |
295 | if (sbspace(&so->so_snd) < -512) { | |
296 | m_freem(m); | |
297 | error = ENOBUFS; | |
298 | break; | |
299 | } | |
300 | /* | |
301 | * According to RFC961 (Assigned Protocols), | |
302 | * the urgent pointer points to the last octet | |
303 | * of urgent data. We continue, however, | |
304 | * to consider it to indicate the first octet | |
305 | * of data past the urgent section. | |
306 | * Otherwise, snd_up should be one lower. | |
307 | */ | |
308 | sbappend(&so->so_snd, m); | |
309 | tp->snd_up = tp->snd_una + so->so_snd.sb_cc; | |
310 | tp->t_force = 1; | |
311 | error = tcp_output(tp); | |
312 | tp->t_force = 0; | |
313 | break; | |
314 | ||
315 | case PRU_SOCKADDR: | |
316 | in_setsockaddr(inp, nam); | |
317 | break; | |
318 | ||
319 | case PRU_PEERADDR: | |
320 | in_setpeeraddr(inp, nam); | |
321 | break; | |
322 | ||
323 | /* | |
324 | * TCP slow timer went off; going through this | |
325 | * routine for tracing's sake. | |
326 | */ | |
327 | case PRU_SLOWTIMO: | |
328 | tp = tcp_timers(tp, (int)nam); | |
329 | req |= (int)nam << 8; /* for debug's sake */ | |
330 | break; | |
331 | ||
332 | default: | |
333 | panic("tcp_usrreq"); | |
334 | } | |
335 | if (tp && (so->so_options & SO_DEBUG)) | |
336 | tcp_trace(TA_USER, ostate, tp, (struct tcpiphdr *)0, req); | |
337 | splx(s); | |
338 | return (error); | |
339 | } | |
340 | ||
4c45483e | 341 | int |
15637ed4 RG |
342 | tcp_ctloutput(op, so, level, optname, mp) |
343 | int op; | |
344 | struct socket *so; | |
345 | int level, optname; | |
346 | struct mbuf **mp; | |
347 | { | |
348 | int error = 0; | |
349 | struct inpcb *inp = sotoinpcb(so); | |
350 | register struct tcpcb *tp = intotcpcb(inp); | |
351 | register struct mbuf *m; | |
352 | ||
353 | if (level != IPPROTO_TCP) | |
354 | return (ip_ctloutput(op, so, level, optname, mp)); | |
355 | ||
356 | switch (op) { | |
357 | ||
358 | case PRCO_SETOPT: | |
359 | m = *mp; | |
360 | switch (optname) { | |
361 | ||
362 | case TCP_NODELAY: | |
363 | if (m == NULL || m->m_len < sizeof (int)) | |
364 | error = EINVAL; | |
365 | else if (*mtod(m, int *)) | |
366 | tp->t_flags |= TF_NODELAY; | |
367 | else | |
368 | tp->t_flags &= ~TF_NODELAY; | |
369 | break; | |
370 | ||
371 | case TCP_MAXSEG: /* not yet */ | |
372 | default: | |
373 | error = EINVAL; | |
374 | break; | |
375 | } | |
376 | if (m) | |
377 | (void) m_free(m); | |
378 | break; | |
379 | ||
380 | case PRCO_GETOPT: | |
381 | *mp = m = m_get(M_WAIT, MT_SOOPTS); | |
382 | m->m_len = sizeof(int); | |
383 | ||
384 | switch (optname) { | |
385 | case TCP_NODELAY: | |
386 | *mtod(m, int *) = tp->t_flags & TF_NODELAY; | |
387 | break; | |
388 | case TCP_MAXSEG: | |
389 | *mtod(m, int *) = tp->t_maxseg; | |
390 | break; | |
391 | default: | |
392 | error = EINVAL; | |
393 | break; | |
394 | } | |
395 | break; | |
396 | } | |
397 | return (error); | |
398 | } | |
399 | ||
15637ed4 RG |
400 | /* |
401 | * Attach TCP protocol to socket, allocating | |
402 | * internet protocol control block, tcp control block, | |
403 | * bufer space, and entering LISTEN state if to accept connections. | |
404 | */ | |
4c45483e | 405 | int |
15637ed4 RG |
406 | tcp_attach(so) |
407 | struct socket *so; | |
408 | { | |
409 | register struct tcpcb *tp; | |
410 | struct inpcb *inp; | |
411 | int error; | |
412 | ||
413 | if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { | |
414 | error = soreserve(so, tcp_sendspace, tcp_recvspace); | |
415 | if (error) | |
416 | return (error); | |
417 | } | |
418 | error = in_pcballoc(so, &tcb); | |
419 | if (error) | |
420 | return (error); | |
421 | inp = sotoinpcb(so); | |
422 | tp = tcp_newtcpcb(inp); | |
423 | if (tp == 0) { | |
424 | int nofd = so->so_state & SS_NOFDREF; /* XXX */ | |
425 | ||
426 | so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ | |
427 | in_pcbdetach(inp); | |
428 | so->so_state |= nofd; | |
429 | return (ENOBUFS); | |
430 | } | |
431 | tp->t_state = TCPS_CLOSED; | |
432 | return (0); | |
433 | } | |
434 | ||
435 | /* | |
436 | * Initiate (or continue) disconnect. | |
437 | * If embryonic state, just send reset (once). | |
438 | * If in ``let data drain'' option and linger null, just drop. | |
439 | * Otherwise (hard), mark socket disconnecting and drop | |
440 | * current input data; switch states based on user close, and | |
441 | * send segment to peer (with FIN). | |
442 | */ | |
443 | struct tcpcb * | |
444 | tcp_disconnect(tp) | |
445 | register struct tcpcb *tp; | |
446 | { | |
447 | struct socket *so = tp->t_inpcb->inp_socket; | |
448 | ||
449 | if (tp->t_state < TCPS_ESTABLISHED) | |
450 | tp = tcp_close(tp); | |
451 | else if ((so->so_options & SO_LINGER) && so->so_linger == 0) | |
452 | tp = tcp_drop(tp, 0); | |
453 | else { | |
454 | soisdisconnecting(so); | |
455 | sbflush(&so->so_rcv); | |
456 | tp = tcp_usrclosed(tp); | |
457 | if (tp) | |
458 | (void) tcp_output(tp); | |
459 | } | |
460 | return (tp); | |
461 | } | |
462 | ||
463 | /* | |
464 | * User issued close, and wish to trail through shutdown states: | |
465 | * if never received SYN, just forget it. If got a SYN from peer, | |
466 | * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. | |
467 | * If already got a FIN from peer, then almost done; go to LAST_ACK | |
468 | * state. In all other cases, have already sent FIN to peer (e.g. | |
469 | * after PRU_SHUTDOWN), and just have to play tedious game waiting | |
470 | * for peer to send FIN or not respond to keep-alives, etc. | |
471 | * We can let the user exit from the close as soon as the FIN is acked. | |
472 | */ | |
473 | struct tcpcb * | |
474 | tcp_usrclosed(tp) | |
475 | register struct tcpcb *tp; | |
476 | { | |
477 | ||
478 | switch (tp->t_state) { | |
479 | ||
480 | case TCPS_CLOSED: | |
481 | case TCPS_LISTEN: | |
482 | case TCPS_SYN_SENT: | |
483 | tp->t_state = TCPS_CLOSED; | |
484 | tp = tcp_close(tp); | |
485 | break; | |
486 | ||
487 | case TCPS_SYN_RECEIVED: | |
488 | case TCPS_ESTABLISHED: | |
489 | tp->t_state = TCPS_FIN_WAIT_1; | |
490 | break; | |
491 | ||
492 | case TCPS_CLOSE_WAIT: | |
493 | tp->t_state = TCPS_LAST_ACK; | |
494 | break; | |
495 | } | |
496 | if (tp && tp->t_state >= TCPS_FIN_WAIT_2) | |
497 | soisdisconnected(tp->t_inpcb->inp_socket); | |
498 | return (tp); | |
499 | } |