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Annotation of 42BSD/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:  * Setup generic address and protocol structures
        !            28:  * for raw_input routine, then pass them along with
        !            29:  * mbuf chain.
        !            30:  */
        !            31: rip_input(m)
        !            32:        struct mbuf *m;
        !            33: {
        !            34:        register struct ip *ip = mtod(m, struct ip *);
        !            35: 
        !            36:        ripproto.sp_protocol = ip->ip_p;
        !            37:        ripdst.sin_addr = ip->ip_dst;
        !            38:        ripsrc.sin_addr = ip->ip_src;
        !            39:        raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
        !            40:          (struct sockaddr *)&ripdst);
        !            41: }
        !            42: 
        !            43: /*
        !            44:  * Generate IP header and pass packet to ip_output.
        !            45:  * Tack on options user may have setup with control call.
        !            46:  */
        !            47: rip_output(m0, so)
        !            48:        struct mbuf *m0;
        !            49:        struct socket *so;
        !            50: {
        !            51:        register struct mbuf *m;
        !            52:        register struct ip *ip;
        !            53:        int len = 0, error;
        !            54:        struct rawcb *rp = sotorawcb(so);
        !            55:        struct sockaddr_in *sin;
        !            56: 
        !            57:        /*
        !            58:         * Calculate data length and get an mbuf
        !            59:         * for IP header.
        !            60:         */
        !            61:        for (m = m0; m; m = m->m_next)
        !            62:                len += m->m_len;
        !            63:        m = m_get(M_DONTWAIT, MT_HEADER);
        !            64:        if (m == 0) {
        !            65:                error = ENOBUFS;
        !            66:                goto bad;
        !            67:        }
        !            68:        
        !            69:        /*
        !            70:         * Fill in IP header as needed.
        !            71:         */
        !            72:        m->m_off = MMAXOFF - sizeof(struct ip);
        !            73:        m->m_len = sizeof(struct ip);
        !            74:        m->m_next = m0;
        !            75:        ip = mtod(m, struct ip *);
        !            76:        ip->ip_p = so->so_proto->pr_protocol;
        !            77:        ip->ip_len = sizeof(struct ip) + len;
        !            78:        if (rp->rcb_flags & RAW_LADDR) {
        !            79:                sin = (struct sockaddr_in *)&rp->rcb_laddr;
        !            80:                if (sin->sin_family != AF_INET) {
        !            81:                        error = EAFNOSUPPORT;
        !            82:                        goto bad;
        !            83:                }
        !            84:                ip->ip_src.s_addr = sin->sin_addr.s_addr;
        !            85:        } else
        !            86:                ip->ip_src.s_addr = 0;
        !            87:        ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr;
        !            88:        ip->ip_ttl = MAXTTL;
        !            89:        return (ip_output(m, (struct mbuf *)0, &rp->rcb_route, 
        !            90:           IP_ROUTETOIF|IP_ALLOWBROADCAST));
        !            91: bad:
        !            92:        m_freem(m);
        !            93:        return (error);
        !            94: }

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