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1.1 root 1: /*
2: * Copyright (c) 1982, 1986 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted
6: * provided that the above copyright notice and this paragraph are
7: * duplicated in all such forms and that any documentation,
8: * advertising materials, and other materials related to such
9: * distribution and use acknowledge that the software was developed
10: * by the University of California, Berkeley. The name of the
11: * University may not be used to endorse or promote products derived
12: * from this software without specific prior written permission.
13: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16: *
17: * @(#)in_pcb.c 7.7 (Berkeley) 6/29/88
18: */
19:
20: #include "param.h"
21: #include "systm.h"
22: #include "dir.h"
23: #include "user.h"
24: #include "mbuf.h"
25: #include "socket.h"
26: #include "socketvar.h"
27: #include "ioctl.h"
28: #include "in.h"
29: #include "in_systm.h"
30: #include "../net/if.h"
31: #include "../net/route.h"
32: #include "in_pcb.h"
33: #include "in_var.h"
34: #include "protosw.h"
35:
36: struct in_addr zeroin_addr;
37:
38: in_pcballoc(so, head)
39: struct socket *so;
40: struct inpcb *head;
41: {
42: struct mbuf *m;
43: register struct inpcb *inp;
44:
45: m = m_getclr(M_DONTWAIT, MT_PCB);
46: if (m == NULL)
47: return (ENOBUFS);
48: inp = mtod(m, struct inpcb *);
49: inp->inp_head = head;
50: inp->inp_socket = so;
51: insque(inp, head);
52: so->so_pcb = (caddr_t)inp;
53: return (0);
54: }
55:
56: in_pcbbind(inp, nam)
57: register struct inpcb *inp;
58: struct mbuf *nam;
59: {
60: register struct socket *so = inp->inp_socket;
61: register struct inpcb *head = inp->inp_head;
62: register struct sockaddr_in *sin;
63: u_short lport = 0;
64:
65: if (in_ifaddr == 0)
66: return (EADDRNOTAVAIL);
67: if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
68: return (EINVAL);
69: if (nam == 0)
70: goto noname;
71: sin = mtod(nam, struct sockaddr_in *);
72: if (nam->m_len != sizeof (*sin))
73: return (EINVAL);
74: if (sin->sin_addr.s_addr != INADDR_ANY) {
75: int tport = sin->sin_port;
76:
77: sin->sin_port = 0; /* yech... */
78: if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
79: return (EADDRNOTAVAIL);
80: sin->sin_port = tport;
81: }
82: lport = sin->sin_port;
83: if (lport) {
84: u_short aport = ntohs(lport);
85: int wild = 0;
86:
87: /* GROSS */
88: if (aport < IPPORT_RESERVED && u.u_uid != 0)
89: return (EACCES);
90: /* even GROSSER, but this is the Internet */
91: if ((so->so_options & SO_REUSEADDR) == 0 &&
92: ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
93: (so->so_options & SO_ACCEPTCONN) == 0))
94: wild = INPLOOKUP_WILDCARD;
95: if (in_pcblookup(head,
96: zeroin_addr, 0, sin->sin_addr, lport, wild))
97: return (EADDRINUSE);
98: }
99: inp->inp_laddr = sin->sin_addr;
100: noname:
101: if (lport == 0)
102: do {
103: if (head->inp_lport++ < IPPORT_RESERVED ||
104: head->inp_lport > IPPORT_USERRESERVED)
105: head->inp_lport = IPPORT_RESERVED;
106: lport = htons(head->inp_lport);
107: } while (in_pcblookup(head,
108: zeroin_addr, 0, inp->inp_laddr, lport, 0));
109: inp->inp_lport = lport;
110: return (0);
111: }
112:
113: /*
114: * Connect from a socket to a specified address.
115: * Both address and port must be specified in argument sin.
116: * If don't have a local address for this socket yet,
117: * then pick one.
118: */
119: in_pcbconnect(inp, nam)
120: register struct inpcb *inp;
121: struct mbuf *nam;
122: {
123: struct in_ifaddr *ia;
124: struct sockaddr_in *ifaddr;
125: register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
126:
127: if (nam->m_len != sizeof (*sin))
128: return (EINVAL);
129: if (sin->sin_family != AF_INET)
130: return (EAFNOSUPPORT);
131: if (sin->sin_port == 0)
132: return (EADDRNOTAVAIL);
133: if (in_ifaddr) {
134: /*
135: * If the destination address is INADDR_ANY,
136: * use the primary local address.
137: * If the supplied address is INADDR_BROADCAST,
138: * and the primary interface supports broadcast,
139: * choose the broadcast address for that interface.
140: */
141: #define satosin(sa) ((struct sockaddr_in *)(sa))
142: if (sin->sin_addr.s_addr == INADDR_ANY)
143: sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr;
144: else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
145: (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST))
146: sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr;
147: }
148: if (inp->inp_laddr.s_addr == INADDR_ANY) {
149: register struct route *ro;
150: struct ifnet *ifp;
151:
152: ia = (struct in_ifaddr *)0;
153: /*
154: * If route is known or can be allocated now,
155: * our src addr is taken from the i/f, else punt.
156: */
157: ro = &inp->inp_route;
158: if (ro->ro_rt &&
159: (satosin(&ro->ro_dst)->sin_addr.s_addr !=
160: sin->sin_addr.s_addr ||
161: inp->inp_socket->so_options & SO_DONTROUTE)) {
162: RTFREE(ro->ro_rt);
163: ro->ro_rt = (struct rtentry *)0;
164: }
165: if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
166: (ro->ro_rt == (struct rtentry *)0 ||
167: ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
168: /* No route yet, so try to acquire one */
169: ro->ro_dst.sa_family = AF_INET;
170: ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
171: sin->sin_addr;
172: rtalloc(ro);
173: }
174: /*
175: * If we found a route, use the address
176: * corresponding to the outgoing interface
177: * unless it is the loopback (in case a route
178: * to our address on another net goes to loopback).
179: */
180: if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp) &&
181: (ifp->if_flags & IFF_LOOPBACK) == 0)
182: for (ia = in_ifaddr; ia; ia = ia->ia_next)
183: if (ia->ia_ifp == ifp)
184: break;
185: if (ia == 0) {
186: int fport = sin->sin_port;
187:
188: sin->sin_port = 0;
189: ia = (struct in_ifaddr *)
190: ifa_ifwithdstaddr((struct sockaddr *)sin);
191: sin->sin_port = fport;
192: if (ia == 0)
193: ia = in_iaonnetof(in_netof(sin->sin_addr));
194: if (ia == 0)
195: ia = in_ifaddr;
196: if (ia == 0)
197: return (EADDRNOTAVAIL);
198: }
199: ifaddr = (struct sockaddr_in *)&ia->ia_addr;
200: }
201: if (in_pcblookup(inp->inp_head,
202: sin->sin_addr,
203: sin->sin_port,
204: inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
205: inp->inp_lport,
206: 0))
207: return (EADDRINUSE);
208: if (inp->inp_laddr.s_addr == INADDR_ANY) {
209: if (inp->inp_lport == 0)
210: (void)in_pcbbind(inp, (struct mbuf *)0);
211: inp->inp_laddr = ifaddr->sin_addr;
212: }
213: inp->inp_faddr = sin->sin_addr;
214: inp->inp_fport = sin->sin_port;
215: return (0);
216: }
217:
218: in_pcbdisconnect(inp)
219: struct inpcb *inp;
220: {
221:
222: inp->inp_faddr.s_addr = INADDR_ANY;
223: inp->inp_fport = 0;
224: if (inp->inp_socket->so_state & SS_NOFDREF)
225: in_pcbdetach(inp);
226: }
227:
228: in_pcbdetach(inp)
229: struct inpcb *inp;
230: {
231: struct socket *so = inp->inp_socket;
232:
233: so->so_pcb = 0;
234: sofree(so);
235: if (inp->inp_options)
236: (void)m_free(inp->inp_options);
237: if (inp->inp_route.ro_rt)
238: rtfree(inp->inp_route.ro_rt);
239: remque(inp);
240: (void) m_free(dtom(inp));
241: }
242:
243: in_setsockaddr(inp, nam)
244: register struct inpcb *inp;
245: struct mbuf *nam;
246: {
247: register struct sockaddr_in *sin;
248:
249: nam->m_len = sizeof (*sin);
250: sin = mtod(nam, struct sockaddr_in *);
251: bzero((caddr_t)sin, sizeof (*sin));
252: sin->sin_family = AF_INET;
253: sin->sin_port = inp->inp_lport;
254: sin->sin_addr = inp->inp_laddr;
255: }
256:
257: in_setpeeraddr(inp, nam)
258: struct inpcb *inp;
259: struct mbuf *nam;
260: {
261: register struct sockaddr_in *sin;
262:
263: nam->m_len = sizeof (*sin);
264: sin = mtod(nam, struct sockaddr_in *);
265: bzero((caddr_t)sin, sizeof (*sin));
266: sin->sin_family = AF_INET;
267: sin->sin_port = inp->inp_fport;
268: sin->sin_addr = inp->inp_faddr;
269: }
270:
271: /*
272: * Pass some notification to all connections of a protocol
273: * associated with address dst. Call the protocol specific
274: * routine (if any) to handle each connection.
275: */
276: in_pcbnotify(head, dst, errno, notify)
277: struct inpcb *head;
278: register struct in_addr *dst;
279: int errno, (*notify)();
280: {
281: register struct inpcb *inp, *oinp;
282: int s = splimp();
283:
284: for (inp = head->inp_next; inp != head;) {
285: if (inp->inp_faddr.s_addr != dst->s_addr ||
286: inp->inp_socket == 0) {
287: inp = inp->inp_next;
288: continue;
289: }
290: if (errno)
291: inp->inp_socket->so_error = errno;
292: oinp = inp;
293: inp = inp->inp_next;
294: if (notify)
295: (*notify)(oinp);
296: }
297: splx(s);
298: }
299:
300: /*
301: * Check for alternatives when higher level complains
302: * about service problems. For now, invalidate cached
303: * routing information. If the route was created dynamically
304: * (by a redirect), time to try a default gateway again.
305: */
306: in_losing(inp)
307: struct inpcb *inp;
308: {
309: register struct rtentry *rt;
310:
311: if ((rt = inp->inp_route.ro_rt)) {
312: if (rt->rt_flags & RTF_DYNAMIC)
313: (void) rtrequest((int)SIOCDELRT, rt);
314: rtfree(rt);
315: inp->inp_route.ro_rt = 0;
316: /*
317: * A new route can be allocated
318: * the next time output is attempted.
319: */
320: }
321: }
322:
323: /*
324: * After a routing change, flush old routing
325: * and allocate a (hopefully) better one.
326: */
327: in_rtchange(inp)
328: register struct inpcb *inp;
329: {
330: if (inp->inp_route.ro_rt) {
331: rtfree(inp->inp_route.ro_rt);
332: inp->inp_route.ro_rt = 0;
333: /*
334: * A new route can be allocated the next time
335: * output is attempted.
336: */
337: }
338: }
339:
340: struct inpcb *
341: in_pcblookup(head, faddr, fport, laddr, lport, flags)
342: struct inpcb *head;
343: struct in_addr faddr, laddr;
344: u_short fport, lport;
345: int flags;
346: {
347: register struct inpcb *inp, *match = 0;
348: int matchwild = 3, wildcard;
349:
350: for (inp = head->inp_next; inp != head; inp = inp->inp_next) {
351: if (inp->inp_lport != lport)
352: continue;
353: wildcard = 0;
354: if (inp->inp_laddr.s_addr != INADDR_ANY) {
355: if (laddr.s_addr == INADDR_ANY)
356: wildcard++;
357: else if (inp->inp_laddr.s_addr != laddr.s_addr)
358: continue;
359: } else {
360: if (laddr.s_addr != INADDR_ANY)
361: wildcard++;
362: }
363: if (inp->inp_faddr.s_addr != INADDR_ANY) {
364: if (faddr.s_addr == INADDR_ANY)
365: wildcard++;
366: else if (inp->inp_faddr.s_addr != faddr.s_addr ||
367: inp->inp_fport != fport)
368: continue;
369: } else {
370: if (faddr.s_addr != INADDR_ANY)
371: wildcard++;
372: }
373: if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0)
374: continue;
375: if (wildcard < matchwild) {
376: match = inp;
377: matchwild = wildcard;
378: if (matchwild == 0)
379: break;
380: }
381: }
382: return (match);
383: }
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