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Annotation of 43BSDTahoe/sys/net/raw_cb.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 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:  *     @(#)raw_cb.c    7.6 (Berkeley) 6/27/88
        !            18:  */
        !            19: 
        !            20: #include "param.h"
        !            21: #include "systm.h"
        !            22: #include "mbuf.h"
        !            23: #include "socket.h"
        !            24: #include "socketvar.h"
        !            25: #include "domain.h"
        !            26: #include "protosw.h"
        !            27: #include "errno.h"
        !            28: 
        !            29: #include "if.h"
        !            30: #include "route.h"
        !            31: #include "raw_cb.h"
        !            32: #include "../netinet/in.h"
        !            33: 
        !            34: #include "../machine/mtpr.h"
        !            35: 
        !            36: /*
        !            37:  * Routines to manage the raw protocol control blocks. 
        !            38:  *
        !            39:  * TODO:
        !            40:  *     hash lookups by protocol family/protocol + address family
        !            41:  *     take care of unique address problems per AF?
        !            42:  *     redo address binding to allow wildcards
        !            43:  */
        !            44: 
        !            45: /*
        !            46:  * Allocate a control block and a nominal amount
        !            47:  * of buffer space for the socket.
        !            48:  */
        !            49: raw_attach(so, proto)
        !            50:        register struct socket *so;
        !            51:        int proto;
        !            52: {
        !            53:        struct mbuf *m;
        !            54:        register struct rawcb *rp;
        !            55: 
        !            56:        m = m_getclr(M_DONTWAIT, MT_PCB);
        !            57:        if (m == 0)
        !            58:                return (ENOBUFS);
        !            59:        if (sbreserve(&so->so_snd, (u_long) RAWSNDQ) == 0)
        !            60:                goto bad;
        !            61:        if (sbreserve(&so->so_rcv, (u_long) RAWRCVQ) == 0)
        !            62:                goto bad2;
        !            63:        rp = mtod(m, struct rawcb *);
        !            64:        rp->rcb_socket = so;
        !            65:        so->so_pcb = (caddr_t)rp;
        !            66:        rp->rcb_pcb = 0;
        !            67:        rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
        !            68:        rp->rcb_proto.sp_protocol = proto;
        !            69:        insque(rp, &rawcb);
        !            70:        return (0);
        !            71: bad2:
        !            72:        sbrelease(&so->so_snd);
        !            73: bad:
        !            74:        (void) m_free(m);
        !            75:        return (ENOBUFS);
        !            76: }
        !            77: 
        !            78: /*
        !            79:  * Detach the raw connection block and discard
        !            80:  * socket resources.
        !            81:  */
        !            82: raw_detach(rp)
        !            83:        register struct rawcb *rp;
        !            84: {
        !            85:        struct socket *so = rp->rcb_socket;
        !            86: 
        !            87:        if (rp->rcb_route.ro_rt)
        !            88:                rtfree(rp->rcb_route.ro_rt);
        !            89:        so->so_pcb = 0;
        !            90:        sofree(so);
        !            91:        remque(rp);
        !            92:        if (rp->rcb_options)
        !            93:                m_freem(rp->rcb_options);
        !            94:        m_freem(dtom(rp));
        !            95: }
        !            96: 
        !            97: /*
        !            98:  * Disconnect and possibly release resources.
        !            99:  */
        !           100: raw_disconnect(rp)
        !           101:        struct rawcb *rp;
        !           102: {
        !           103: 
        !           104:        rp->rcb_flags &= ~RAW_FADDR;
        !           105:        if (rp->rcb_socket->so_state & SS_NOFDREF)
        !           106:                raw_detach(rp);
        !           107: }
        !           108: 
        !           109: raw_bind(so, nam)
        !           110:        register struct socket *so;
        !           111:        struct mbuf *nam;
        !           112: {
        !           113:        struct sockaddr *addr = mtod(nam, struct sockaddr *);
        !           114:        register struct rawcb *rp;
        !           115: 
        !           116:        if (ifnet == 0)
        !           117:                return (EADDRNOTAVAIL);
        !           118: /* BEGIN DUBIOUS */
        !           119:        /*
        !           120:         * Should we verify address not already in use?
        !           121:         * Some say yes, others no.
        !           122:         */
        !           123:        switch (addr->sa_family) {
        !           124: 
        !           125: #ifdef INET
        !           126:        case AF_IMPLINK:
        !           127:        case AF_INET: {
        !           128:                if (((struct sockaddr_in *)addr)->sin_addr.s_addr &&
        !           129:                    ifa_ifwithaddr(addr) == 0)
        !           130:                        return (EADDRNOTAVAIL);
        !           131:                break;
        !           132:        }
        !           133: #endif
        !           134: 
        !           135:        default:
        !           136:                return (EAFNOSUPPORT);
        !           137:        }
        !           138: /* END DUBIOUS */
        !           139:        rp = sotorawcb(so);
        !           140:        bcopy((caddr_t)addr, (caddr_t)&rp->rcb_laddr, sizeof (*addr));
        !           141:        rp->rcb_flags |= RAW_LADDR;
        !           142:        return (0);
        !           143: }
        !           144: 
        !           145: /*
        !           146:  * Associate a peer's address with a
        !           147:  * raw connection block.
        !           148:  */
        !           149: raw_connaddr(rp, nam)
        !           150:        struct rawcb *rp;
        !           151:        struct mbuf *nam;
        !           152: {
        !           153:        struct sockaddr *addr = mtod(nam, struct sockaddr *);
        !           154: 
        !           155:        bcopy((caddr_t)addr, (caddr_t)&rp->rcb_faddr, sizeof(*addr));
        !           156:        rp->rcb_flags |= RAW_FADDR;
        !           157: }

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