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Annotation of 43BSDReno/sys/netinet/in_pcb.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 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:  *     @(#)in_pcb.c    7.13 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "param.h"
        !            24: #include "systm.h"
        !            25: #include "user.h"
        !            26: #include "malloc.h"
        !            27: #include "mbuf.h"
        !            28: #include "socket.h"
        !            29: #include "socketvar.h"
        !            30: #include "ioctl.h"
        !            31: #include "../net/if.h"
        !            32: #include "../net/route.h"
        !            33: #include "in.h"
        !            34: #include "in_systm.h"
        !            35: #include "ip.h"
        !            36: #include "in_pcb.h"
        !            37: #include "in_var.h"
        !            38: #include "protosw.h"
        !            39: 
        !            40: struct in_addr zeroin_addr;
        !            41: 
        !            42: in_pcballoc(so, head)
        !            43:        struct socket *so;
        !            44:        struct inpcb *head;
        !            45: {
        !            46:        struct mbuf *m;
        !            47:        register struct inpcb *inp;
        !            48: 
        !            49:        m = m_getclr(M_DONTWAIT, MT_PCB);
        !            50:        if (m == NULL)
        !            51:                return (ENOBUFS);
        !            52:        inp = mtod(m, struct inpcb *);
        !            53:        inp->inp_head = head;
        !            54:        inp->inp_socket = so;
        !            55:        insque(inp, head);
        !            56:        so->so_pcb = (caddr_t)inp;
        !            57:        return (0);
        !            58: }
        !            59:        
        !            60: in_pcbbind(inp, nam)
        !            61:        register struct inpcb *inp;
        !            62:        struct mbuf *nam;
        !            63: {
        !            64:        register struct socket *so = inp->inp_socket;
        !            65:        register struct inpcb *head = inp->inp_head;
        !            66:        register struct sockaddr_in *sin;
        !            67:        u_short lport = 0;
        !            68: 
        !            69:        if (in_ifaddr == 0)
        !            70:                return (EADDRNOTAVAIL);
        !            71:        if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
        !            72:                return (EINVAL);
        !            73:        if (nam == 0)
        !            74:                goto noname;
        !            75:        sin = mtod(nam, struct sockaddr_in *);
        !            76:        if (nam->m_len != sizeof (*sin))
        !            77:                return (EINVAL);
        !            78:        if (sin->sin_addr.s_addr != INADDR_ANY) {
        !            79:                int tport = sin->sin_port;
        !            80: 
        !            81:                sin->sin_port = 0;              /* yech... */
        !            82:                if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
        !            83:                        return (EADDRNOTAVAIL);
        !            84:                sin->sin_port = tport;
        !            85:        }
        !            86:        lport = sin->sin_port;
        !            87:        if (lport) {
        !            88:                u_short aport = ntohs(lport);
        !            89:                int wild = 0;
        !            90: 
        !            91:                /* GROSS */
        !            92:                if (aport < IPPORT_RESERVED && u.u_uid != 0)
        !            93:                        return (EACCES);
        !            94:                /* even GROSSER, but this is the Internet */
        !            95:                if ((so->so_options & SO_REUSEADDR) == 0 &&
        !            96:                    ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
        !            97:                     (so->so_options & SO_ACCEPTCONN) == 0))
        !            98:                        wild = INPLOOKUP_WILDCARD;
        !            99:                if (in_pcblookup(head,
        !           100:                    zeroin_addr, 0, sin->sin_addr, lport, wild))
        !           101:                        return (EADDRINUSE);
        !           102:        }
        !           103:        inp->inp_laddr = sin->sin_addr;
        !           104: noname:
        !           105:        if (lport == 0)
        !           106:                do {
        !           107:                        if (head->inp_lport++ < IPPORT_RESERVED ||
        !           108:                            head->inp_lport > IPPORT_USERRESERVED)
        !           109:                                head->inp_lport = IPPORT_RESERVED;
        !           110:                        lport = htons(head->inp_lport);
        !           111:                } while (in_pcblookup(head,
        !           112:                            zeroin_addr, 0, inp->inp_laddr, lport, 0));
        !           113:        inp->inp_lport = lport;
        !           114:        return (0);
        !           115: }
        !           116: 
        !           117: /*
        !           118:  * Connect from a socket to a specified address.
        !           119:  * Both address and port must be specified in argument sin.
        !           120:  * If don't have a local address for this socket yet,
        !           121:  * then pick one.
        !           122:  */
        !           123: in_pcbconnect(inp, nam)
        !           124:        register struct inpcb *inp;
        !           125:        struct mbuf *nam;
        !           126: {
        !           127:        struct in_ifaddr *ia;
        !           128:        struct sockaddr_in *ifaddr;
        !           129:        register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
        !           130: 
        !           131:        if (nam->m_len != sizeof (*sin))
        !           132:                return (EINVAL);
        !           133:        if (sin->sin_family != AF_INET)
        !           134:                return (EAFNOSUPPORT);
        !           135:        if (sin->sin_port == 0)
        !           136:                return (EADDRNOTAVAIL);
        !           137:        if (in_ifaddr) {
        !           138:                /*
        !           139:                 * If the destination address is INADDR_ANY,
        !           140:                 * use the primary local address.
        !           141:                 * If the supplied address is INADDR_BROADCAST,
        !           142:                 * and the primary interface supports broadcast,
        !           143:                 * choose the broadcast address for that interface.
        !           144:                 */
        !           145: #define        satosin(sa)     ((struct sockaddr_in *)(sa))
        !           146:                if (sin->sin_addr.s_addr == INADDR_ANY)
        !           147:                    sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr;
        !           148:                else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
        !           149:                  (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST))
        !           150:                    sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr;
        !           151:        }
        !           152:        if (inp->inp_laddr.s_addr == INADDR_ANY) {
        !           153:                register struct route *ro;
        !           154:                struct ifnet *ifp;
        !           155: 
        !           156:                ia = (struct in_ifaddr *)0;
        !           157:                /* 
        !           158:                 * If route is known or can be allocated now,
        !           159:                 * our src addr is taken from the i/f, else punt.
        !           160:                 */
        !           161:                ro = &inp->inp_route;
        !           162:                if (ro->ro_rt &&
        !           163:                    (satosin(&ro->ro_dst)->sin_addr.s_addr !=
        !           164:                        sin->sin_addr.s_addr || 
        !           165:                    inp->inp_socket->so_options & SO_DONTROUTE)) {
        !           166:                        RTFREE(ro->ro_rt);
        !           167:                        ro->ro_rt = (struct rtentry *)0;
        !           168:                }
        !           169:                if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
        !           170:                    (ro->ro_rt == (struct rtentry *)0 ||
        !           171:                    ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
        !           172:                        /* No route yet, so try to acquire one */
        !           173:                        ro->ro_dst.sa_family = AF_INET;
        !           174:                        ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
        !           175:                        ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
        !           176:                                sin->sin_addr;
        !           177:                        rtalloc(ro);
        !           178:                }
        !           179:                /*
        !           180:                 * If we found a route, use the address
        !           181:                 * corresponding to the outgoing interface
        !           182:                 * unless it is the loopback (in case a route
        !           183:                 * to our address on another net goes to loopback).
        !           184:                 */
        !           185:                if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp) &&
        !           186:                    (ifp->if_flags & IFF_LOOPBACK) == 0)
        !           187:                        for (ia = in_ifaddr; ia; ia = ia->ia_next)
        !           188:                                if (ia->ia_ifp == ifp)
        !           189:                                        break;
        !           190:                if (ia == 0) {
        !           191:                        int fport = sin->sin_port;
        !           192: 
        !           193:                        sin->sin_port = 0;
        !           194:                        ia = (struct in_ifaddr *)
        !           195:                            ifa_ifwithdstaddr((struct sockaddr *)sin);
        !           196:                        sin->sin_port = fport;
        !           197:                        if (ia == 0)
        !           198:                                ia = in_iaonnetof(in_netof(sin->sin_addr));
        !           199:                        if (ia == 0)
        !           200:                                ia = in_ifaddr;
        !           201:                        if (ia == 0)
        !           202:                                return (EADDRNOTAVAIL);
        !           203:                }
        !           204:                ifaddr = (struct sockaddr_in *)&ia->ia_addr;
        !           205:        }
        !           206:        if (in_pcblookup(inp->inp_head,
        !           207:            sin->sin_addr,
        !           208:            sin->sin_port,
        !           209:            inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
        !           210:            inp->inp_lport,
        !           211:            0))
        !           212:                return (EADDRINUSE);
        !           213:        if (inp->inp_laddr.s_addr == INADDR_ANY) {
        !           214:                if (inp->inp_lport == 0)
        !           215:                        (void)in_pcbbind(inp, (struct mbuf *)0);
        !           216:                inp->inp_laddr = ifaddr->sin_addr;
        !           217:        }
        !           218:        inp->inp_faddr = sin->sin_addr;
        !           219:        inp->inp_fport = sin->sin_port;
        !           220:        return (0);
        !           221: }
        !           222: 
        !           223: in_pcbdisconnect(inp)
        !           224:        struct inpcb *inp;
        !           225: {
        !           226: 
        !           227:        inp->inp_faddr.s_addr = INADDR_ANY;
        !           228:        inp->inp_fport = 0;
        !           229:        if (inp->inp_socket->so_state & SS_NOFDREF)
        !           230:                in_pcbdetach(inp);
        !           231: }
        !           232: 
        !           233: in_pcbdetach(inp)
        !           234:        struct inpcb *inp;
        !           235: {
        !           236:        struct socket *so = inp->inp_socket;
        !           237: 
        !           238:        so->so_pcb = 0;
        !           239:        sofree(so);
        !           240:        if (inp->inp_options)
        !           241:                (void)m_free(inp->inp_options);
        !           242:        if (inp->inp_route.ro_rt)
        !           243:                rtfree(inp->inp_route.ro_rt);
        !           244:        remque(inp);
        !           245:        (void) m_free(dtom(inp));
        !           246: }
        !           247: 
        !           248: in_setsockaddr(inp, nam)
        !           249:        register struct inpcb *inp;
        !           250:        struct mbuf *nam;
        !           251: {
        !           252:        register struct sockaddr_in *sin;
        !           253:        
        !           254:        nam->m_len = sizeof (*sin);
        !           255:        sin = mtod(nam, struct sockaddr_in *);
        !           256:        bzero((caddr_t)sin, sizeof (*sin));
        !           257:        sin->sin_family = AF_INET;
        !           258:        sin->sin_len = sizeof(*sin);
        !           259:        sin->sin_port = inp->inp_lport;
        !           260:        sin->sin_addr = inp->inp_laddr;
        !           261: }
        !           262: 
        !           263: in_setpeeraddr(inp, nam)
        !           264:        struct inpcb *inp;
        !           265:        struct mbuf *nam;
        !           266: {
        !           267:        register struct sockaddr_in *sin;
        !           268:        
        !           269:        nam->m_len = sizeof (*sin);
        !           270:        sin = mtod(nam, struct sockaddr_in *);
        !           271:        bzero((caddr_t)sin, sizeof (*sin));
        !           272:        sin->sin_family = AF_INET;
        !           273:        sin->sin_len = sizeof(*sin);
        !           274:        sin->sin_port = inp->inp_fport;
        !           275:        sin->sin_addr = inp->inp_faddr;
        !           276: }
        !           277: 
        !           278: /*
        !           279:  * Pass some notification to all connections of a protocol
        !           280:  * associated with address dst.  The local address and/or port numbers
        !           281:  * may be specified to limit the search.  The "usual action" will be
        !           282:  * taken, depending on the ctlinput cmd.  The caller must filter any
        !           283:  * cmds that are uninteresting (e.g., no error in the map).
        !           284:  * Call the protocol specific routine (if any) to report
        !           285:  * any errors for each matching socket.
        !           286:  *
        !           287:  * Must be called at splnet.
        !           288:  */
        !           289: in_pcbnotify(head, dst, fport, laddr, lport, cmd, notify)
        !           290:        struct inpcb *head;
        !           291:        struct sockaddr *dst;
        !           292:        u_short fport, lport;
        !           293:        struct in_addr laddr;
        !           294:        int cmd, (*notify)();
        !           295: {
        !           296:        register struct inpcb *inp, *oinp;
        !           297:        struct in_addr faddr;
        !           298:        int errno;
        !           299:        int in_rtchange();
        !           300:        extern u_char inetctlerrmap[];
        !           301: 
        !           302:        if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET)
        !           303:                return;
        !           304:        faddr = ((struct sockaddr_in *)dst)->sin_addr;
        !           305:        if (faddr.s_addr == INADDR_ANY)
        !           306:                return;
        !           307: 
        !           308:        /*
        !           309:         * Redirects go to all references to the destination,
        !           310:         * and use in_rtchange to invalidate the route cache.
        !           311:         * Dead host indications: notify all references to the destination.
        !           312:         * Otherwise, if we have knowledge of the local port and address,
        !           313:         * deliver only to that socket.
        !           314:         */
        !           315:        if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
        !           316:                fport = 0;
        !           317:                lport = 0;
        !           318:                laddr.s_addr = 0;
        !           319:                if (cmd != PRC_HOSTDEAD)
        !           320:                        notify = in_rtchange;
        !           321:        }
        !           322:        errno = inetctlerrmap[cmd];
        !           323:        for (inp = head->inp_next; inp != head;) {
        !           324:                if (inp->inp_faddr.s_addr != faddr.s_addr ||
        !           325:                    inp->inp_socket == 0 ||
        !           326:                    (lport && inp->inp_lport != lport) ||
        !           327:                    (laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) ||
        !           328:                    (fport && inp->inp_fport != fport)) {
        !           329:                        inp = inp->inp_next;
        !           330:                        continue;
        !           331:                }
        !           332:                oinp = inp;
        !           333:                inp = inp->inp_next;
        !           334:                if (notify)
        !           335:                        (*notify)(oinp, errno);
        !           336:        }
        !           337: }
        !           338: 
        !           339: /*
        !           340:  * Check for alternatives when higher level complains
        !           341:  * about service problems.  For now, invalidate cached
        !           342:  * routing information.  If the route was created dynamically
        !           343:  * (by a redirect), time to try a default gateway again.
        !           344:  */
        !           345: in_losing(inp)
        !           346:        struct inpcb *inp;
        !           347: {
        !           348:        register struct rtentry *rt;
        !           349: 
        !           350:        if ((rt = inp->inp_route.ro_rt)) {
        !           351:                rt_missmsg(RTM_LOSING, &inp->inp_route.ro_dst,
        !           352:                            rt->rt_gateway, (struct sockaddr *)rt_mask(rt),
        !           353:                            (struct sockaddr *)0, rt->rt_flags, 0);
        !           354:                if (rt->rt_flags & RTF_DYNAMIC)
        !           355:                        (void) rtrequest(RTM_DELETE, rt_key(rt),
        !           356:                                rt->rt_gateway, rt_mask(rt), rt->rt_flags, 
        !           357:                                (struct rtentry **)0);
        !           358:                inp->inp_route.ro_rt = 0;
        !           359:                rtfree(rt);
        !           360:                /*
        !           361:                 * A new route can be allocated
        !           362:                 * the next time output is attempted.
        !           363:                 */
        !           364:        }
        !           365: }
        !           366: 
        !           367: /*
        !           368:  * After a routing change, flush old routing
        !           369:  * and allocate a (hopefully) better one.
        !           370:  */
        !           371: in_rtchange(inp)
        !           372:        register struct inpcb *inp;
        !           373: {
        !           374:        if (inp->inp_route.ro_rt) {
        !           375:                rtfree(inp->inp_route.ro_rt);
        !           376:                inp->inp_route.ro_rt = 0;
        !           377:                /*
        !           378:                 * A new route can be allocated the next time
        !           379:                 * output is attempted.
        !           380:                 */
        !           381:        }
        !           382: }
        !           383: 
        !           384: struct inpcb *
        !           385: in_pcblookup(head, faddr, fport, laddr, lport, flags)
        !           386:        struct inpcb *head;
        !           387:        struct in_addr faddr, laddr;
        !           388:        u_short fport, lport;
        !           389:        int flags;
        !           390: {
        !           391:        register struct inpcb *inp, *match = 0;
        !           392:        int matchwild = 3, wildcard;
        !           393: 
        !           394:        for (inp = head->inp_next; inp != head; inp = inp->inp_next) {
        !           395:                if (inp->inp_lport != lport)
        !           396:                        continue;
        !           397:                wildcard = 0;
        !           398:                if (inp->inp_laddr.s_addr != INADDR_ANY) {
        !           399:                        if (laddr.s_addr == INADDR_ANY)
        !           400:                                wildcard++;
        !           401:                        else if (inp->inp_laddr.s_addr != laddr.s_addr)
        !           402:                                continue;
        !           403:                } else {
        !           404:                        if (laddr.s_addr != INADDR_ANY)
        !           405:                                wildcard++;
        !           406:                }
        !           407:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
        !           408:                        if (faddr.s_addr == INADDR_ANY)
        !           409:                                wildcard++;
        !           410:                        else if (inp->inp_faddr.s_addr != faddr.s_addr ||
        !           411:                            inp->inp_fport != fport)
        !           412:                                continue;
        !           413:                } else {
        !           414:                        if (faddr.s_addr != INADDR_ANY)
        !           415:                                wildcard++;
        !           416:                }
        !           417:                if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0)
        !           418:                        continue;
        !           419:                if (wildcard < matchwild) {
        !           420:                        match = inp;
        !           421:                        matchwild = wildcard;
        !           422:                        if (matchwild == 0)
        !           423:                                break;
        !           424:                }
        !           425:        }
        !           426:        return (match);
        !           427: }

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