Commit | Line | Data |
---|---|---|
b11be056 | 1 | /* tcp_usrreq.c 6.1 83/07/29 */ |
72f24d7d | 2 | |
4eb5d593 | 3 | #include "../h/param.h" |
72f24d7d | 4 | #include "../h/systm.h" |
dad64fdf BJ |
5 | #include "../h/mbuf.h" |
6 | #include "../h/socket.h" | |
eee3ab16 BJ |
7 | #include "../h/socketvar.h" |
8 | #include "../h/protosw.h" | |
f4d55810 | 9 | #include "../h/errno.h" |
6e7edb25 BJ |
10 | |
11 | #include "../net/if.h" | |
c124e997 | 12 | #include "../net/route.h" |
f4d55810 | 13 | |
6e7edb25 | 14 | #include "../netinet/in.h" |
839fe741 BJ |
15 | #include "../netinet/in_pcb.h" |
16 | #include "../netinet/in_systm.h" | |
839fe741 BJ |
17 | #include "../netinet/ip.h" |
18 | #include "../netinet/ip_var.h" | |
19 | #include "../netinet/tcp.h" | |
20 | #include "../netinet/tcp_fsm.h" | |
21 | #include "../netinet/tcp_seq.h" | |
22 | #include "../netinet/tcp_timer.h" | |
23 | #include "../netinet/tcp_var.h" | |
24 | #include "../netinet/tcpip.h" | |
25 | #include "../netinet/tcp_debug.h" | |
eee3ab16 | 26 | |
290e0b0a BJ |
27 | /* |
28 | * TCP protocol interface to socket abstraction. | |
29 | */ | |
30 | extern char *tcpstates[]; | |
4ad99bae | 31 | struct tcpcb *tcp_newtcpcb(); |
ab85b059 | 32 | int tcpsenderrors; |
290e0b0a | 33 | |
9c5022e3 | 34 | /* |
290e0b0a | 35 | * Process a TCP user request for TCP tb. If this is a send request |
9c5022e3 BJ |
36 | * then m is the mbuf chain of send data. If this is a timer expiration |
37 | * (called from the software clock routine), then timertype tells which timer. | |
38 | */ | |
a8d3bf7f | 39 | /*ARGSUSED*/ |
ab85b059 | 40 | tcp_usrreq(so, req, m, nam, rights) |
eee3ab16 BJ |
41 | struct socket *so; |
42 | int req; | |
ab85b059 | 43 | struct mbuf *m, *nam, *rights; |
4eb5d593 | 44 | { |
53a5409e | 45 | register struct inpcb *inp = sotoinpcb(so); |
cdad2eb1 | 46 | register struct tcpcb *tp; |
72f24d7d | 47 | int s = splnet(); |
eee3ab16 | 48 | int error = 0; |
17b82ed4 | 49 | int ostate; |
72f24d7d | 50 | |
ab85b059 SL |
51 | if (rights && rights->m_len) { |
52 | splx(s); | |
53 | return (EINVAL); | |
54 | } | |
53a5409e | 55 | /* |
290e0b0a BJ |
56 | * When a TCP is attached to a socket, then there will be |
57 | * a (struct inpcb) pointed at by the socket, and this | |
58 | * structure will point at a subsidary (struct tcpcb). | |
53a5409e | 59 | */ |
0974b45c | 60 | if (inp == 0 && req != PRU_ATTACH) { |
a6503abf | 61 | splx(s); |
290e0b0a | 62 | return (EINVAL); /* XXX */ |
a6503abf BJ |
63 | } |
64 | if (inp) { | |
cdad2eb1 | 65 | tp = intotcpcb(inp); |
8075bb0e | 66 | /* WHAT IF TP IS 0? */ |
9c5022e3 | 67 | #ifdef KPROF |
a6503abf | 68 | tcp_acounts[tp->t_state][req]++; |
9c5022e3 | 69 | #endif |
17b82ed4 | 70 | ostate = tp->t_state; |
ebf42a75 BJ |
71 | } else |
72 | ostate = 0; | |
eee3ab16 | 73 | switch (req) { |
4eb5d593 | 74 | |
290e0b0a BJ |
75 | /* |
76 | * TCP attaches to socket via PRU_ATTACH, reserving space, | |
8075bb0e | 77 | * and an internet control block. |
290e0b0a | 78 | */ |
eee3ab16 | 79 | case PRU_ATTACH: |
4ad99bae | 80 | if (inp) { |
eee3ab16 | 81 | error = EISCONN; |
cdad2eb1 | 82 | break; |
53a5409e | 83 | } |
a1edc12b | 84 | error = tcp_attach(so); |
a6503abf | 85 | if (error) |
4ad99bae | 86 | break; |
0e3936fa | 87 | if ((so->so_options & SO_LINGER) && so->so_linger == 0) |
8e65fd66 | 88 | so->so_linger = TCP_LINGERTIME; |
290e0b0a | 89 | tp = sototcpcb(so); |
72f24d7d | 90 | break; |
4eb5d593 | 91 | |
290e0b0a BJ |
92 | /* |
93 | * PRU_DETACH detaches the TCP protocol from the socket. | |
94 | * If the protocol state is non-embryonic, then can't | |
95 | * do this directly: have to initiate a PRU_DISCONNECT, | |
96 | * which may finish later; embryonic TCB's can just | |
97 | * be discarded here. | |
98 | */ | |
eee3ab16 | 99 | case PRU_DETACH: |
290e0b0a | 100 | if (tp->t_state > TCPS_LISTEN) |
0e3936fa SL |
101 | tp = tcp_disconnect(tp); |
102 | else | |
103 | tp = tcp_close(tp); | |
eee3ab16 BJ |
104 | break; |
105 | ||
8075bb0e BJ |
106 | /* |
107 | * Give the socket an address. | |
108 | */ | |
109 | case PRU_BIND: | |
110 | error = in_pcbbind(inp, nam); | |
111 | if (error) | |
112 | break; | |
113 | break; | |
114 | ||
115 | /* | |
116 | * Prepare to accept connections. | |
117 | */ | |
118 | case PRU_LISTEN: | |
119 | if (inp->inp_lport == 0) | |
120 | error = in_pcbbind(inp, (struct mbuf *)0); | |
121 | if (error == 0) | |
122 | tp->t_state = TCPS_LISTEN; | |
123 | break; | |
124 | ||
290e0b0a BJ |
125 | /* |
126 | * Initiate connection to peer. | |
127 | * Create a template for use in transmissions on this connection. | |
128 | * Enter SYN_SENT state, and mark socket as connecting. | |
129 | * Start keep-alive timer, and seed output sequence space. | |
130 | * Send initial segment on connection. | |
131 | */ | |
eee3ab16 | 132 | case PRU_CONNECT: |
8075bb0e BJ |
133 | if (inp->inp_lport == 0) { |
134 | error = in_pcbbind(inp, (struct mbuf *)0); | |
135 | if (error) | |
136 | break; | |
137 | } | |
138 | error = in_pcbconnect(inp, nam); | |
4ad99bae | 139 | if (error) |
53a5409e | 140 | break; |
b454c3ea | 141 | tp->t_template = tcp_template(tp); |
290e0b0a BJ |
142 | if (tp->t_template == 0) { |
143 | in_pcbdisconnect(inp); | |
144 | error = ENOBUFS; | |
145 | break; | |
146 | } | |
53a5409e | 147 | soisconnecting(so); |
a6503abf | 148 | tp->t_state = TCPS_SYN_SENT; |
4aed14e3 BJ |
149 | tp->t_timer[TCPT_KEEP] = TCPTV_KEEP; |
150 | tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2; | |
151 | tcp_sendseqinit(tp); | |
8a2f82db | 152 | error = tcp_output(tp); |
72f24d7d | 153 | break; |
4eb5d593 | 154 | |
4945768c SL |
155 | /* |
156 | * Create a TCP connection between two sockets. | |
157 | */ | |
158 | case PRU_CONNECT2: | |
159 | error = EOPNOTSUPP; | |
160 | break; | |
161 | ||
290e0b0a BJ |
162 | /* |
163 | * Initiate disconnect from peer. | |
164 | * If connection never passed embryonic stage, just drop; | |
165 | * else if don't need to let data drain, then can just drop anyways, | |
166 | * else have to begin TCP shutdown process: mark socket disconnecting, | |
167 | * drain unread data, state switch to reflect user close, and | |
168 | * send segment (e.g. FIN) to peer. Socket will be really disconnected | |
169 | * when peer sends FIN and acks ours. | |
170 | * | |
171 | * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. | |
172 | */ | |
173 | case PRU_DISCONNECT: | |
0e3936fa | 174 | tp = tcp_disconnect(tp); |
4aed14e3 BJ |
175 | break; |
176 | ||
290e0b0a BJ |
177 | /* |
178 | * Accept a connection. Essentially all the work is | |
179 | * done at higher levels; just return the address | |
180 | * of the peer, storing through addr. | |
181 | */ | |
1acff8ec | 182 | case PRU_ACCEPT: { |
8075bb0e | 183 | struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); |
1acff8ec | 184 | |
8075bb0e BJ |
185 | nam->m_len = sizeof (struct sockaddr_in); |
186 | sin->sin_family = AF_INET; | |
187 | sin->sin_port = inp->inp_fport; | |
188 | sin->sin_addr = inp->inp_faddr; | |
eee3ab16 | 189 | break; |
8075bb0e | 190 | } |
eee3ab16 | 191 | |
290e0b0a BJ |
192 | /* |
193 | * Mark the connection as being incapable of further output. | |
194 | */ | |
eee3ab16 | 195 | case PRU_SHUTDOWN: |
0974b45c | 196 | socantsendmore(so); |
0e3936fa SL |
197 | tp = tcp_usrclosed(tp); |
198 | if (tp) | |
199 | error = tcp_output(tp); | |
72f24d7d BJ |
200 | break; |
201 | ||
290e0b0a BJ |
202 | /* |
203 | * After a receive, possibly send window update to peer. | |
204 | */ | |
eee3ab16 | 205 | case PRU_RCVD: |
f1b2fa5b | 206 | (void) tcp_output(tp); |
72f24d7d BJ |
207 | break; |
208 | ||
290e0b0a BJ |
209 | /* |
210 | * Do a send by putting data in output queue and updating urgent | |
211 | * marker if URG set. Possibly send more data. | |
212 | */ | |
eee3ab16 | 213 | case PRU_SEND: |
a6503abf | 214 | sbappend(&so->so_snd, m); |
8a2f82db | 215 | #ifdef notdef |
0974b45c | 216 | if (tp->t_flags & TF_PUSH) |
a6503abf | 217 | tp->snd_end = tp->snd_una + so->so_snd.sb_cc; |
8a2f82db SL |
218 | #endif |
219 | error = tcp_output(tp); | |
ab85b059 SL |
220 | if (error) { /* XXX fix to use other path */ |
221 | if (error == ENOBUFS) /* XXX */ | |
222 | error = 0; /* XXX */ | |
223 | tcpsenderrors++; | |
224 | } | |
72f24d7d BJ |
225 | break; |
226 | ||
290e0b0a BJ |
227 | /* |
228 | * Abort the TCP. | |
229 | */ | |
eee3ab16 | 230 | case PRU_ABORT: |
0e3936fa | 231 | tp = tcp_drop(tp, ECONNABORTED); |
72f24d7d BJ |
232 | break; |
233 | ||
290e0b0a | 234 | /* SOME AS YET UNIMPLEMENTED HOOKS */ |
eee3ab16 | 235 | case PRU_CONTROL: |
53a5409e | 236 | error = EOPNOTSUPP; |
eee3ab16 BJ |
237 | break; |
238 | ||
f1b2fa5b BJ |
239 | case PRU_SENSE: |
240 | error = EOPNOTSUPP; | |
241 | break; | |
0244dbc7 | 242 | /* END UNIMPLEMENTED HOOKS */ |
f1b2fa5b BJ |
243 | |
244 | case PRU_RCVOOB: | |
8b5a83bb BJ |
245 | if (so->so_oobmark == 0 && |
246 | (so->so_state & SS_RCVATMARK) == 0) { | |
0244dbc7 BJ |
247 | error = EINVAL; |
248 | break; | |
249 | } | |
b2db9217 | 250 | if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { |
8b5a83bb | 251 | error = EWOULDBLOCK; |
b2db9217 | 252 | break; |
8b5a83bb | 253 | } |
283ea225 | 254 | m->m_len = 1; |
b2db9217 | 255 | *mtod(m, caddr_t) = tp->t_iobc; |
f1b2fa5b BJ |
256 | break; |
257 | ||
258 | case PRU_SENDOOB: | |
8b5a83bb | 259 | if (sbspace(&so->so_snd) < -512) { |
37279c1b | 260 | m_freem(m); |
8b5a83bb BJ |
261 | error = ENOBUFS; |
262 | break; | |
263 | } | |
0244dbc7 BJ |
264 | tp->snd_up = tp->snd_una + so->so_snd.sb_cc + 1; |
265 | sbappend(&so->so_snd, m); | |
b2db9217 | 266 | tp->t_force = 1; |
8a2f82db | 267 | error = tcp_output(tp); |
b2db9217 | 268 | tp->t_force = 0; |
f1b2fa5b BJ |
269 | break; |
270 | ||
126472ab | 271 | case PRU_SOCKADDR: |
8075bb0e | 272 | in_setsockaddr(inp, nam); |
126472ab SL |
273 | break; |
274 | ||
a7343092 SL |
275 | case PRU_PEERADDR: |
276 | in_setpeeraddr(inp, nam); | |
277 | break; | |
278 | ||
290e0b0a BJ |
279 | /* |
280 | * TCP slow timer went off; going through this | |
281 | * routine for tracing's sake. | |
282 | */ | |
eee3ab16 | 283 | case PRU_SLOWTIMO: |
0e3936fa | 284 | tp = tcp_timers(tp, (int)nam); |
8075bb0e | 285 | req |= (int)nam << 8; /* for debug's sake */ |
eee3ab16 BJ |
286 | break; |
287 | ||
9c5022e3 BJ |
288 | default: |
289 | panic("tcp_usrreq"); | |
72f24d7d | 290 | } |
17b82ed4 BJ |
291 | if (tp && (so->so_options & SO_DEBUG)) |
292 | tcp_trace(TA_USER, ostate, tp, (struct tcpiphdr *)0, req); | |
72f24d7d | 293 | splx(s); |
53a5409e | 294 | return (error); |
4eb5d593 | 295 | } |
4aed14e3 | 296 | |
306f91c9 | 297 | int tcp_sendspace = 1024*2; |
1bc20e72 | 298 | int tcp_recvspace = 1024*2; |
290e0b0a BJ |
299 | /* |
300 | * Attach TCP protocol to socket, allocating | |
301 | * internet protocol control block, tcp control block, | |
302 | * bufer space, and entering LISTEN state if to accept connections. | |
303 | */ | |
8075bb0e | 304 | tcp_attach(so) |
290e0b0a | 305 | struct socket *so; |
290e0b0a BJ |
306 | { |
307 | register struct tcpcb *tp; | |
308 | struct inpcb *inp; | |
309 | int error; | |
310 | ||
59965020 | 311 | error = soreserve(so, tcp_sendspace, tcp_recvspace); |
ebf42a75 BJ |
312 | if (error) |
313 | goto bad; | |
314 | error = in_pcballoc(so, &tcb); | |
290e0b0a | 315 | if (error) |
8075bb0e BJ |
316 | goto bad; |
317 | inp = sotoinpcb(so); | |
290e0b0a | 318 | tp = tcp_newtcpcb(inp); |
ebf42a75 BJ |
319 | if (tp == 0) { |
320 | error = ENOBUFS; | |
321 | goto bad2; | |
322 | } | |
8075bb0e | 323 | tp->t_state = TCPS_CLOSED; |
290e0b0a | 324 | return (0); |
ebf42a75 BJ |
325 | bad2: |
326 | in_pcbdetach(inp); | |
327 | bad: | |
328 | return (error); | |
290e0b0a BJ |
329 | } |
330 | ||
331 | /* | |
332 | * Initiate (or continue) disconnect. | |
333 | * If embryonic state, just send reset (once). | |
f9e4ec68 | 334 | * If in ``let data drain'' option and linger null, just drop. |
290e0b0a BJ |
335 | * Otherwise (hard), mark socket disconnecting and drop |
336 | * current input data; switch states based on user close, and | |
337 | * send segment to peer (with FIN). | |
338 | */ | |
0e3936fa | 339 | struct tcpcb * |
290e0b0a | 340 | tcp_disconnect(tp) |
0e3936fa | 341 | register struct tcpcb *tp; |
290e0b0a BJ |
342 | { |
343 | struct socket *so = tp->t_inpcb->inp_socket; | |
344 | ||
345 | if (tp->t_state < TCPS_ESTABLISHED) | |
0e3936fa | 346 | tp = tcp_close(tp); |
f9e4ec68 | 347 | else if ((so->so_options & SO_LINGER) && so->so_linger == 0) |
0e3936fa | 348 | tp = tcp_drop(tp, 0); |
290e0b0a BJ |
349 | else { |
350 | soisdisconnecting(so); | |
351 | sbflush(&so->so_rcv); | |
0e3936fa SL |
352 | tp = tcp_usrclosed(tp); |
353 | if (tp) | |
354 | (void) tcp_output(tp); | |
290e0b0a | 355 | } |
0e3936fa | 356 | return (tp); |
290e0b0a BJ |
357 | } |
358 | ||
359 | /* | |
360 | * User issued close, and wish to trail through shutdown states: | |
361 | * if never received SYN, just forget it. If got a SYN from peer, | |
362 | * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. | |
363 | * If already got a FIN from peer, then almost done; go to LAST_ACK | |
364 | * state. In all other cases, have already sent FIN to peer (e.g. | |
365 | * after PRU_SHUTDOWN), and just have to play tedious game waiting | |
366 | * for peer to send FIN or not respond to keep-alives, etc. | |
085a0b90 | 367 | * We can let the user exit from the close as soon as the FIN is acked. |
290e0b0a | 368 | */ |
0e3936fa | 369 | struct tcpcb * |
4aed14e3 | 370 | tcp_usrclosed(tp) |
0e3936fa | 371 | register struct tcpcb *tp; |
4aed14e3 BJ |
372 | { |
373 | ||
4aed14e3 BJ |
374 | switch (tp->t_state) { |
375 | ||
815b24e1 | 376 | case TCPS_CLOSED: |
4aed14e3 BJ |
377 | case TCPS_LISTEN: |
378 | case TCPS_SYN_SENT: | |
379 | tp->t_state = TCPS_CLOSED; | |
0e3936fa | 380 | tp = tcp_close(tp); |
4aed14e3 BJ |
381 | break; |
382 | ||
383 | case TCPS_SYN_RECEIVED: | |
384 | case TCPS_ESTABLISHED: | |
385 | tp->t_state = TCPS_FIN_WAIT_1; | |
386 | break; | |
387 | ||
388 | case TCPS_CLOSE_WAIT: | |
389 | tp->t_state = TCPS_LAST_ACK; | |
390 | break; | |
391 | } | |
0e3936fa | 392 | if (tp && tp->t_state >= TCPS_FIN_WAIT_2) |
085a0b90 | 393 | soisdisconnected(tp->t_inpcb->inp_socket); |
0e3936fa | 394 | return (tp); |
4aed14e3 | 395 | } |