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Annotation of 43BSD/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.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)raw_cb.c    7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: #include "param.h"
        !            10: #include "systm.h"
        !            11: #include "mbuf.h"
        !            12: #include "socket.h"
        !            13: #include "socketvar.h"
        !            14: #include "domain.h"
        !            15: #include "protosw.h"
        !            16: #include "errno.h"
        !            17: 
        !            18: #include "if.h"
        !            19: #include "route.h"
        !            20: #include "raw_cb.h"
        !            21: #include "../netinet/in.h"
        !            22: 
        !            23: #include "../vax/mtpr.h"
        !            24: 
        !            25: /*
        !            26:  * Routines to manage the raw protocol control blocks. 
        !            27:  *
        !            28:  * TODO:
        !            29:  *     hash lookups by protocol family/protocol + address family
        !            30:  *     take care of unique address problems per AF?
        !            31:  *     redo address binding to allow wildcards
        !            32:  */
        !            33: 
        !            34: /*
        !            35:  * Allocate a control block and a nominal amount
        !            36:  * of buffer space for the socket.
        !            37:  */
        !            38: raw_attach(so, proto)
        !            39:        register struct socket *so;
        !            40:        int proto;
        !            41: {
        !            42:        struct mbuf *m;
        !            43:        register struct rawcb *rp;
        !            44: 
        !            45:        m = m_getclr(M_DONTWAIT, MT_PCB);
        !            46:        if (m == 0)
        !            47:                return (ENOBUFS);
        !            48:        if (sbreserve(&so->so_snd, RAWSNDQ) == 0)
        !            49:                goto bad;
        !            50:        if (sbreserve(&so->so_rcv, RAWRCVQ) == 0)
        !            51:                goto bad2;
        !            52:        rp = mtod(m, struct rawcb *);
        !            53:        rp->rcb_socket = so;
        !            54:        so->so_pcb = (caddr_t)rp;
        !            55:        rp->rcb_pcb = 0;
        !            56:        rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
        !            57:        rp->rcb_proto.sp_protocol = proto;
        !            58:        insque(rp, &rawcb);
        !            59:        return (0);
        !            60: bad2:
        !            61:        sbrelease(&so->so_snd);
        !            62: bad:
        !            63:        (void) m_free(m);
        !            64:        return (ENOBUFS);
        !            65: }
        !            66: 
        !            67: /*
        !            68:  * Detach the raw connection block and discard
        !            69:  * socket resources.
        !            70:  */
        !            71: raw_detach(rp)
        !            72:        register struct rawcb *rp;
        !            73: {
        !            74:        struct socket *so = rp->rcb_socket;
        !            75: 
        !            76:        if (rp->rcb_route.ro_rt)
        !            77:                rtfree(rp->rcb_route.ro_rt);
        !            78:        so->so_pcb = 0;
        !            79:        sofree(so);
        !            80:        remque(rp);
        !            81:        if (rp->rcb_options)
        !            82:                m_freem(dtom(rp->rcb_options));
        !            83:        m_freem(dtom(rp));
        !            84: }
        !            85: 
        !            86: /*
        !            87:  * Disconnect and possibly release resources.
        !            88:  */
        !            89: raw_disconnect(rp)
        !            90:        struct rawcb *rp;
        !            91: {
        !            92: 
        !            93:        rp->rcb_flags &= ~RAW_FADDR;
        !            94:        if (rp->rcb_socket->so_state & SS_NOFDREF)
        !            95:                raw_detach(rp);
        !            96: }
        !            97: 
        !            98: raw_bind(so, nam)
        !            99:        register struct socket *so;
        !           100:        struct mbuf *nam;
        !           101: {
        !           102:        struct sockaddr *addr = mtod(nam, struct sockaddr *);
        !           103:        register struct rawcb *rp;
        !           104: 
        !           105:        if (ifnet == 0)
        !           106:                return (EADDRNOTAVAIL);
        !           107: /* BEGIN DUBIOUS */
        !           108:        /*
        !           109:         * Should we verify address not already in use?
        !           110:         * Some say yes, others no.
        !           111:         */
        !           112:        switch (addr->sa_family) {
        !           113: 
        !           114: #ifdef INET
        !           115:        case AF_IMPLINK:
        !           116:        case AF_INET: {
        !           117:                if (((struct sockaddr_in *)addr)->sin_addr.s_addr &&
        !           118:                    ifa_ifwithaddr(addr) == 0)
        !           119:                        return (EADDRNOTAVAIL);
        !           120:                break;
        !           121:        }
        !           122: #endif
        !           123: 
        !           124:        default:
        !           125:                return (EAFNOSUPPORT);
        !           126:        }
        !           127: /* END DUBIOUS */
        !           128:        rp = sotorawcb(so);
        !           129:        bcopy((caddr_t)addr, (caddr_t)&rp->rcb_laddr, sizeof (*addr));
        !           130:        rp->rcb_flags |= RAW_LADDR;
        !           131:        return (0);
        !           132: }
        !           133: 
        !           134: /*
        !           135:  * Associate a peer's address with a
        !           136:  * raw connection block.
        !           137:  */
        !           138: raw_connaddr(rp, nam)
        !           139:        struct rawcb *rp;
        !           140:        struct mbuf *nam;
        !           141: {
        !           142:        struct sockaddr *addr = mtod(nam, struct sockaddr *);
        !           143: 
        !           144:        bcopy((caddr_t)addr, (caddr_t)&rp->rcb_faddr, sizeof(*addr));
        !           145:        rp->rcb_flags |= RAW_FADDR;
        !           146: }

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