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Annotation of 42BSD/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:  * 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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