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Annotation of cci/sys/netinet/raw_ip.c, revision 1.1.1.1

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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