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Annotation of 43BSDTahoe/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 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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