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Annotation of cci/sys/netinet/raw_ip.c, revision 1.1

1.1     ! root        1: /*     raw_ip.c        6.1     83/07/29        */
        !             2: 
        !             3: #include "../h/param.h"
        !             4: #include "../h/mbuf.h"
        !             5: #include "../h/socket.h"
        !             6: #include "../h/protosw.h"
        !             7: #include "../h/socketvar.h"
        !             8: #include "../h/errno.h"
        !             9: 
        !            10: #include "../net/if.h"
        !            11: #include "../net/route.h"
        !            12: #include "../net/raw_cb.h"
        !            13: 
        !            14: #include "../netinet/in.h"
        !            15: #include "../netinet/in_systm.h"
        !            16: #include "../netinet/ip.h"
        !            17: #include "../netinet/ip_var.h"
        !            18: 
        !            19: /*
        !            20:  * Raw interface to IP protocol.
        !            21:  */
        !            22: 
        !            23: struct sockaddr_in ripdst = { AF_INET };
        !            24: struct sockaddr_in ripsrc = { AF_INET };
        !            25: struct sockproto ripproto = { PF_INET };
        !            26: /*
        !            27:  * Changes
        !            28:  * .   clear the field ip_off in rip_output() after allocating
        !            29:  *     the mbuf.
        !            30:  */
        !            31: /*
        !            32:  * Setup generic address and protocol structures
        !            33:  * for raw_input routine, then pass them along with
        !            34:  * mbuf chain.
        !            35:  */
        !            36: rip_input(m)
        !            37:        struct mbuf *m;
        !            38: {
        !            39:        register struct ip *ip = mtod(m, struct ip *);
        !            40: 
        !            41:        ripproto.sp_protocol = ip->ip_p;
        !            42:        ripdst.sin_addr = ip->ip_dst;
        !            43:        ripsrc.sin_addr = ip->ip_src;
        !            44:        raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
        !            45:          (struct sockaddr *)&ripdst);
        !            46: }
        !            47: 
        !            48: /*
        !            49:  * Generate IP header and pass packet to ip_output.
        !            50:  * Tack on options user may have setup with control call.
        !            51:  */
        !            52: rip_output(m0, so)
        !            53:        struct mbuf *m0;
        !            54:        struct socket *so;
        !            55: {
        !            56:        register struct mbuf *m;
        !            57:        register struct ip *ip;
        !            58:        int len = 0, error;
        !            59:        struct rawcb *rp = sotorawcb(so);
        !            60:        struct sockaddr_in *sin;
        !            61: 
        !            62:        /*
        !            63:         * Calculate data length and get an mbuf
        !            64:         * for IP header.
        !            65:         */
        !            66:        for (m = m0; m; m = m->m_next)
        !            67:                len += m->m_len;
        !            68:        m = m_get(M_DONTWAIT, MT_HEADER);
        !            69:        MBUFNULL(10, m);                        /* for debugging */
        !            70:        if (m == 0) {
        !            71:                error = ENOBUFS;
        !            72:                goto bad;
        !            73:        }
        !            74:        
        !            75:        /*
        !            76:         * Fill in IP header as needed.
        !            77:         */
        !            78:        m->m_off = MMAXOFF - sizeof(struct ip);
        !            79:        m->m_len = sizeof(struct ip);
        !            80:        m->m_next = m0;
        !            81:        ip = mtod(m, struct ip *);
        !            82:        ip->ip_off = 0;
        !            83:        ip->ip_p = so->so_proto->pr_protocol;
        !            84:        ip->ip_len = sizeof(struct ip) + len;
        !            85:        if (rp->rcb_flags & RAW_LADDR) {
        !            86:                sin = (struct sockaddr_in *)&rp->rcb_laddr;
        !            87:                if (sin->sin_family != AF_INET) {
        !            88:                        error = EAFNOSUPPORT;
        !            89:                        goto bad;
        !            90:                }
        !            91:                ip->ip_src.s_addr = sin->sin_addr.s_addr;
        !            92:        } else
        !            93:                ip->ip_src.s_addr = 0;
        !            94:        ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr;
        !            95:        ip->ip_ttl = MAXTTL;
        !            96:        return (ip_output(m, (struct mbuf *)0, &rp->rcb_route, 
        !            97:           IP_ROUTETOIF|IP_ALLOWBROADCAST));
        !            98: bad:
        !            99:        m_freem(m);
        !           100:        return (error);
        !           101: }

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