1 /*
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 *
7 * @(#)tuba_usrreq.c 8.1 (Berkeley) 06/10/93
8 */
9
10 #include <sys/param.h>
11 #include <sys/systm.h>
12 #include <sys/malloc.h>
13 #include <sys/mbuf.h>
14 #include <sys/socket.h>
15 #include <sys/socketvar.h>
16 #include <sys/protosw.h>
17 #include <sys/errno.h>
18 #include <sys/stat.h>
19
20 #include <net/if.h>
21 #include <net/route.h>
22
23 #include <netinet/in.h>
24 #include <netinet/in_systm.h>
25 #include <netinet/ip.h>
26 #include <netinet/in_pcb.h>
27 #include <netinet/ip_var.h>
28 #include <netinet/tcp.h>
29 #include <netinet/tcp_fsm.h>
30 #include <netinet/tcp_seq.h>
31 #include <netinet/tcp_timer.h>
32 #include <netinet/tcp_var.h>
33 #include <netinet/tcpip.h>
34 #include <netinet/tcp_debug.h>
35
36 #include <netiso/argo_debug.h>
37 #include <netiso/iso.h>
38 #include <netiso/clnp.h>
39 #include <netiso/iso_pcb.h>
40 #include <netiso/iso_var.h>
41 #include <netiso/tuba_table.h>
42 /*
43 * TCP protocol interface to socket abstraction.
44 */
45 extern char *tcpstates[];
46 extern struct inpcb tuba_inpcb;
47 extern struct isopcb tuba_isopcb;
48
49 /*
50 * Process a TCP user request for TCP tb. If this is a send request
51 * then m is the mbuf chain of send data. If this is a timer expiration
52 * (called from the software clock routine), then timertype tells which timer.
53 */
54 /*ARGSUSED*/
55 tuba_usrreq(so, req, m, nam, control)
56 struct socket *so;
57 int req;
58 struct mbuf *m, *nam, *control;
59 {
60 register struct inpcb *inp;
61 register struct isopcb *isop;
62 register struct tcpcb *tp;
63 int s;
64 int error = 0;
65 int ostate;
66 struct sockaddr_iso *siso;
67
68 if (req == PRU_CONTROL)
69 return (iso_control(so, (int)m, (caddr_t)nam,
70 (struct ifnet *)control));
71
72 s = splnet();
73 inp = sotoinpcb(so);
74 /*
75 * When a TCP is attached to a socket, then there will be
76 * a (struct inpcb) pointed at by the socket, and this
77 * structure will point at a subsidary (struct tcpcb).
78 */
79 if (inp == 0 && req != PRU_ATTACH) {
80 splx(s);
81 return (EINVAL); /* XXX */
82 }
83 if (inp) {
84 tp = intotcpcb(inp);
85 if (tp == 0)
86 panic("tuba_usrreq");
87 ostate = tp->t_state;
88 isop = (struct isopcb *)tp->t_tuba_pcb;
89 if (isop == 0)
90 panic("tuba_usrreq 2");
91 } else
92 ostate = 0;
93 switch (req) {
94
95 /*
96 * TCP attaches to socket via PRU_ATTACH, reserving space,
97 * and an internet control block. We also need to
98 * allocate an isopcb and separate the control block from
99 * tcp/ip ones.
100 */
101 case PRU_ATTACH:
102 if (error = iso_pcballoc(so, &tuba_isopcb))
103 break;
104 isop = (struct isopcb *)so->so_pcb;
105 so->so_pcb = 0;
106 if (error = tcp_usrreq(so, req, m, nam, control)) {
107 isop->isop_socket = 0;
108 iso_pcbdetach(isop);
109 } else {
110 inp = sotoinpcb(so);
111 remque(inp);
112 insque(inp, &tuba_inpcb);
113 inp->inp_head = &tuba_inpcb;
114 tp = intotcpcb(inp);
115 if (tp == 0)
116 panic("tuba_usrreq 3");
117 tp->t_tuba_pcb = (caddr_t) isop;
118 }
119 goto notrace;
120
121 /*
122 * PRU_DETACH detaches the TCP protocol from the socket.
123 * If the protocol state is non-embryonic, then can't
124 * do this directly: have to initiate a PRU_DISCONNECT,
125 * which may finish later; embryonic TCB's can just
126 * be discarded here.
127 */
128 case PRU_DETACH:
129 if (tp->t_state > TCPS_LISTEN)
130 tp = tcp_disconnect(tp);
131 else
132 tp = tcp_close(tp);
133 if (tp == 0)
134 tuba_pcbdetach(isop);
135 break;
136
137 /*
138 * Give the socket an address.
139 */
140 case PRU_BIND:
141 siso = mtod(nam, struct sockaddr_iso *);
142 if (siso->siso_tlen && siso->siso_tlen != 2) {
143 error = EINVAL;
144 break;
145 }
146 if ((error = iso_pcbbind(isop, nam)) ||
147 (siso = isop->isop_laddr) == 0)
148 break;
149 bcopy(TSEL(siso), &inp->inp_lport, 2);
150 if (siso->siso_nlen &&
151 !(inp->inp_laddr.s_addr = tuba_lookup(siso, M_WAITOK)))
152 error = ENOBUFS;
153 break;
154
155 /*
156 * Prepare to accept connections.
157 */
158 case PRU_CONNECT:
159 case PRU_LISTEN:
160 if (inp->inp_lport == 0 &&
161 (error = iso_pcbbind(isop, (struct mbuf *)0)))
162 break;
163 bcopy(TSEL(isop->isop_laddr), &inp->inp_lport, 2);
164 if (req == PRU_LISTEN) {
165 tp->t_state = TCPS_LISTEN;
166 break;
167 }
168 /*FALLTHROUGH*/
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 (error = iso_pcbconnect(isop, nam))
178 break;
179 if ((siso = isop->isop_laddr) && siso->siso_nlen > 1)
180 siso->siso_data[siso->siso_nlen - 1] = ISOPROTO_TCP;
181 else
182 panic("tuba_usrreq: connect");
183 siso = mtod(nam, struct sockaddr_iso *);
184 if (!(inp->inp_faddr.s_addr = tuba_lookup(siso, M_WAITOK))) {
185 unconnect:
186 iso_pcbdisconnect(isop);
187 error = ENOBUFS;
188 break;
189 }
190 bcopy(TSEL(isop->isop_faddr), &inp->inp_fport, 2);
191 if (inp->inp_laddr.s_addr == 0 &&
192 (inp->inp_laddr.s_addr =
193 tuba_lookup(isop->isop_laddr, M_WAITOK)) == 0)
194 goto unconnect;
195 if ((tp->t_template = tcp_template(tp)) == 0)
196 goto unconnect;
197 soisconnecting(so);
198 tcpstat.tcps_connattempt++;
199 tp->t_state = TCPS_SYN_SENT;
200 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
201 tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2;
202 tcp_sendseqinit(tp);
203 error = tcp_output(tp);
204 tuba_refcnt(isop, 1);
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 if ((tp = tcp_disconnect(tp)) == 0)
220 tuba_pcbdetach(isop);
221 break;
222
223 /*
224 * Accept a connection. Essentially all the work is
225 * done at higher levels; just return the address
226 * of the peer, storing through addr.
227 */
228 case PRU_ACCEPT:
229 bcopy((caddr_t)isop->isop_faddr, mtod(nam, caddr_t),
230 nam->m_len = isop->isop_faddr->siso_len);
231 break;
232
233 /*
234 * Mark the connection as being incapable of further output.
235 */
236 case PRU_SHUTDOWN:
237 socantsendmore(so);
238 tp = tcp_usrclosed(tp);
239 if (tp)
240 error = tcp_output(tp);
241 else
242 tuba_pcbdetach(isop);
243 break;
244 /*
245 * Abort the TCP.
246 */
247 case PRU_ABORT:
248 if ((tp = tcp_drop(tp, ECONNABORTED)) == 0)
249 tuba_pcbdetach(isop);
250 break;
251
252
253 case PRU_SOCKADDR:
254 if (isop->isop_laddr)
255 bcopy((caddr_t)isop->isop_laddr, mtod(nam, caddr_t),
256 nam->m_len = isop->isop_laddr->siso_len);
257 break;
258
259 case PRU_PEERADDR:
260 if (isop->isop_faddr)
261 bcopy((caddr_t)isop->isop_faddr, mtod(nam, caddr_t),
262 nam->m_len = isop->isop_faddr->siso_len);
263 break;
264
265 default:
266 error = tcp_usrreq(so, req, m, nam, control);
267 goto notrace;
268 }
269 if (tp && (so->so_options & SO_DEBUG))
270 tcp_trace(TA_USER, ostate, tp, (struct tcpiphdr *)0, req);
271 notrace:
272 splx(s);
273 return(error);
274 }
275
tuba_ctloutput(op,so,level,optname,mp)276 tuba_ctloutput(op, so, level, optname, mp)
277 int op;
278 struct socket *so;
279 int level, optname;
280 struct mbuf **mp;
281 {
282 int clnp_ctloutput(), tcp_ctloutput();
283
284 return ((level != IPPROTO_TCP ? clnp_ctloutput : tcp_ctloutput)
285 (op, so, level, optname, mp));
286 }
287