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1.1 root 1: /*
2: * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
3: * All rights reserved.
4: *
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.
19: *
20: * @(#)ns_pcb.c 7.9 (Berkeley) 6/28/90
21: */
22:
23: #include "param.h"
24: #include "systm.h"
25: #include "user.h"
26: #include "mbuf.h"
27: #include "socket.h"
28: #include "socketvar.h"
29: #include "../net/if.h"
30: #include "../net/route.h"
31: #include "protosw.h"
32:
33: #include "ns.h"
34: #include "ns_if.h"
35: #include "ns_pcb.h"
36:
37: struct ns_addr zerons_addr;
38:
39: ns_pcballoc(so, head)
40: struct socket *so;
41: struct nspcb *head;
42: {
43: struct mbuf *m;
44: register struct nspcb *nsp;
45:
46: m = m_getclr(M_DONTWAIT, MT_PCB);
47: if (m == NULL)
48: return (ENOBUFS);
49: nsp = mtod(m, struct nspcb *);
50: nsp->nsp_socket = so;
51: insque(nsp, head);
52: so->so_pcb = (caddr_t)nsp;
53: return (0);
54: }
55:
56: ns_pcbbind(nsp, nam)
57: register struct nspcb *nsp;
58: struct mbuf *nam;
59: {
60: register struct sockaddr_ns *sns;
61: u_short lport = 0;
62:
63: if (nsp->nsp_lport || !ns_nullhost(nsp->nsp_laddr))
64: return (EINVAL);
65: if (nam == 0)
66: goto noname;
67: sns = mtod(nam, struct sockaddr_ns *);
68: if (nam->m_len != sizeof (*sns))
69: return (EINVAL);
70: if (!ns_nullhost(sns->sns_addr)) {
71: int tport = sns->sns_port;
72:
73: sns->sns_port = 0; /* yech... */
74: if (ifa_ifwithaddr((struct sockaddr *)sns) == 0)
75: return (EADDRNOTAVAIL);
76: sns->sns_port = tport;
77: }
78: lport = sns->sns_port;
79: if (lport) {
80: u_short aport = ntohs(lport);
81:
82: if (aport < NSPORT_RESERVED && u.u_uid != 0)
83: return (EACCES);
84: if (ns_pcblookup(&zerons_addr, lport, 0))
85: return (EADDRINUSE);
86: }
87: nsp->nsp_laddr = sns->sns_addr;
88: noname:
89: if (lport == 0)
90: do {
91: if (nspcb.nsp_lport++ < NSPORT_RESERVED)
92: nspcb.nsp_lport = NSPORT_RESERVED;
93: lport = htons(nspcb.nsp_lport);
94: } while (ns_pcblookup(&zerons_addr, lport, 0));
95: nsp->nsp_lport = lport;
96: return (0);
97: }
98:
99: /*
100: * Connect from a socket to a specified address.
101: * Both address and port must be specified in argument sns.
102: * If don't have a local address for this socket yet,
103: * then pick one.
104: */
105: ns_pcbconnect(nsp, nam)
106: struct nspcb *nsp;
107: struct mbuf *nam;
108: {
109: struct ns_ifaddr *ia;
110: register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
111: register struct ns_addr *dst;
112: register struct route *ro;
113: struct ifnet *ifp;
114:
115: if (nam->m_len != sizeof (*sns))
116: return (EINVAL);
117: if (sns->sns_family != AF_NS)
118: return (EAFNOSUPPORT);
119: if (sns->sns_port==0 || ns_nullhost(sns->sns_addr))
120: return (EADDRNOTAVAIL);
121: /*
122: * If we haven't bound which network number to use as ours,
123: * we will use the number of the outgoing interface.
124: * This depends on having done a routing lookup, which
125: * we will probably have to do anyway, so we might
126: * as well do it now. On the other hand if we are
127: * sending to multiple destinations we may have already
128: * done the lookup, so see if we can use the route
129: * from before. In any case, we only
130: * chose a port number once, even if sending to multiple
131: * destinations.
132: */
133: ro = &nsp->nsp_route;
134: dst = &satons_addr(ro->ro_dst);
135: if (ro->ro_rt) {
136: if (nsp->nsp_socket->so_options & SO_DONTROUTE)
137: goto flush;
138: if (!ns_neteq(nsp->nsp_lastdst, sns->sns_addr))
139: goto flush;
140: if (!ns_hosteq(nsp->nsp_lastdst, sns->sns_addr)) {
141: if (((ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
142: == RTF_GATEWAY)
143: || ((ifp = ro->ro_rt->rt_ifp) &&
144: !(ifp->if_flags & IFF_POINTOPOINT))) {
145: /* can patch route to avoid rtalloc */
146: *dst = sns->sns_addr;
147: } else {
148: flush:
149: RTFREE(ro->ro_rt);
150: ro->ro_rt = (struct rtentry *)0;
151: }
152: }/* else cached route is ok; do nothing */
153: }
154: nsp->nsp_lastdst = sns->sns_addr;
155: if ((nsp->nsp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
156: (ro->ro_rt == (struct rtentry *)0 ||
157: ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
158: /* No route yet, so try to acquire one */
159: ro->ro_dst.sa_family = AF_NS;
160: ro->ro_dst.sa_len = sizeof(ro->ro_dst);
161: *dst = sns->sns_addr;
162: dst->x_port = 0;
163: rtalloc(ro);
164: }
165: if (ns_neteqnn(nsp->nsp_laddr.x_net, ns_zeronet)) {
166: /*
167: * If route is known or can be allocated now,
168: * our src addr is taken from the i/f, else punt.
169: */
170:
171: ia = (struct ns_ifaddr *)0;
172: /*
173: * If we found a route, use the address
174: * corresponding to the outgoing interface
175: */
176: if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp))
177: for (ia = ns_ifaddr; ia; ia = ia->ia_next)
178: if (ia->ia_ifp == ifp)
179: break;
180: if (ia == 0) {
181: u_short fport = sns->sns_addr.x_port;
182: sns->sns_addr.x_port = 0;
183: ia = (struct ns_ifaddr *)
184: ifa_ifwithdstaddr((struct sockaddr *)sns);
185: sns->sns_addr.x_port = fport;
186: if (ia == 0)
187: ia = ns_iaonnetof(&sns->sns_addr);
188: if (ia == 0)
189: ia = ns_ifaddr;
190: if (ia == 0)
191: return (EADDRNOTAVAIL);
192: }
193: nsp->nsp_laddr.x_net = satons_addr(ia->ia_addr).x_net;
194: }
195: if (ns_pcblookup(&sns->sns_addr, nsp->nsp_lport, 0))
196: return (EADDRINUSE);
197: if (ns_nullhost(nsp->nsp_laddr)) {
198: if (nsp->nsp_lport == 0)
199: (void) ns_pcbbind(nsp, (struct mbuf *)0);
200: nsp->nsp_laddr.x_host = ns_thishost;
201: }
202: nsp->nsp_faddr = sns->sns_addr;
203: /* Includes nsp->nsp_fport = sns->sns_port; */
204: return (0);
205: }
206:
207: ns_pcbdisconnect(nsp)
208: struct nspcb *nsp;
209: {
210:
211: nsp->nsp_faddr = zerons_addr;
212: if (nsp->nsp_socket->so_state & SS_NOFDREF)
213: ns_pcbdetach(nsp);
214: }
215:
216: ns_pcbdetach(nsp)
217: struct nspcb *nsp;
218: {
219: struct socket *so = nsp->nsp_socket;
220:
221: so->so_pcb = 0;
222: sofree(so);
223: if (nsp->nsp_route.ro_rt)
224: rtfree(nsp->nsp_route.ro_rt);
225: remque(nsp);
226: (void) m_free(dtom(nsp));
227: }
228:
229: ns_setsockaddr(nsp, nam)
230: register struct nspcb *nsp;
231: struct mbuf *nam;
232: {
233: register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
234:
235: nam->m_len = sizeof (*sns);
236: sns = mtod(nam, struct sockaddr_ns *);
237: bzero((caddr_t)sns, sizeof (*sns));
238: sns->sns_len = sizeof(*sns);
239: sns->sns_family = AF_NS;
240: sns->sns_addr = nsp->nsp_laddr;
241: }
242:
243: ns_setpeeraddr(nsp, nam)
244: register struct nspcb *nsp;
245: struct mbuf *nam;
246: {
247: register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
248:
249: nam->m_len = sizeof (*sns);
250: sns = mtod(nam, struct sockaddr_ns *);
251: bzero((caddr_t)sns, sizeof (*sns));
252: sns->sns_len = sizeof(*sns);
253: sns->sns_family = AF_NS;
254: sns->sns_addr = nsp->nsp_faddr;
255: }
256:
257: /*
258: * Pass some notification to all connections of a protocol
259: * associated with address dst. Call the
260: * protocol specific routine to handle each connection.
261: * Also pass an extra paramter via the nspcb. (which may in fact
262: * be a parameter list!)
263: */
264: ns_pcbnotify(dst, errno, notify, param)
265: register struct ns_addr *dst;
266: long param;
267: int errno, (*notify)();
268: {
269: register struct nspcb *nsp, *oinp;
270: int s = splimp();
271:
272: for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb);) {
273: if (!ns_hosteq(*dst,nsp->nsp_faddr)) {
274: next:
275: nsp = nsp->nsp_next;
276: continue;
277: }
278: if (nsp->nsp_socket == 0)
279: goto next;
280: if (errno)
281: nsp->nsp_socket->so_error = errno;
282: oinp = nsp;
283: nsp = nsp->nsp_next;
284: oinp->nsp_notify_param = param;
285: (*notify)(oinp);
286: }
287: splx(s);
288: }
289:
290: #ifdef notdef
291: /*
292: * After a routing change, flush old routing
293: * and allocate a (hopefully) better one.
294: */
295: ns_rtchange(nsp)
296: struct nspcb *nsp;
297: {
298: if (nsp->nsp_route.ro_rt) {
299: rtfree(nsp->nsp_route.ro_rt);
300: nsp->nsp_route.ro_rt = 0;
301: /*
302: * A new route can be allocated the next time
303: * output is attempted.
304: */
305: }
306: /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
307: }
308: #endif
309:
310: struct nspcb *
311: ns_pcblookup(faddr, lport, wildp)
312: struct ns_addr *faddr;
313: u_short lport;
314: {
315: register struct nspcb *nsp, *match = 0;
316: int matchwild = 3, wildcard;
317: u_short fport;
318:
319: fport = faddr->x_port;
320: for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb); nsp = nsp->nsp_next) {
321: if (nsp->nsp_lport != lport)
322: continue;
323: wildcard = 0;
324: if (ns_nullhost(nsp->nsp_faddr)) {
325: if (!ns_nullhost(*faddr))
326: wildcard++;
327: } else {
328: if (ns_nullhost(*faddr))
329: wildcard++;
330: else {
331: if (!ns_hosteq(nsp->nsp_faddr, *faddr))
332: continue;
333: if (nsp->nsp_fport != fport) {
334: if (nsp->nsp_fport != 0)
335: continue;
336: else
337: wildcard++;
338: }
339: }
340: }
341: if (wildcard && wildp==0)
342: continue;
343: if (wildcard < matchwild) {
344: match = nsp;
345: matchwild = wildcard;
346: if (wildcard == 0)
347: break;
348: }
349: }
350: return (match);
351: }
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