| 1 | /* A sample version of rip_output() from /sys/netinet/raw_ip.c */ |
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| 2 | |
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| 3 | rip_output(m, so) |
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| 4 | register struct mbuf *m; |
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| 5 | struct socket *so; |
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| 6 | { |
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| 7 | register struct ip *ip; |
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| 8 | int error; |
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| 9 | struct rawcb *rp = sotorawcb(so); |
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| 10 | struct sockaddr_in *sin; |
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| 11 | #if BSD>=43 |
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| 12 | short proto = rp->rcb_proto.sp_protocol; |
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| 13 | #else |
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| 14 | short proto = so->so_proto->pr_protocol; |
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| 15 | #endif |
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| 16 | /* |
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| 17 | * if the protocol is IPPROTO_RAW, the user handed us a |
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| 18 | * complete IP packet. Otherwise, allocate an mbuf for a |
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| 19 | * header and fill it in as needed. |
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| 20 | */ |
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| 21 | if (proto != IPPROTO_RAW) { |
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| 22 | /* |
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| 23 | * Calculate data length and get an mbuf |
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| 24 | * for IP header. |
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| 25 | */ |
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| 26 | int len = 0; |
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| 27 | struct mbuf *m0; |
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| 28 | |
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| 29 | for (m0 = m; m; m = m->m_next) |
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| 30 | len += m->m_len; |
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| 31 | |
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| 32 | m = m_get(M_DONTWAIT, MT_HEADER); |
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| 33 | if (m == 0) { |
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| 34 | m = m0; |
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| 35 | error = ENOBUFS; |
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| 36 | goto bad; |
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| 37 | } |
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| 38 | m->m_off = MMAXOFF - sizeof(struct ip); |
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| 39 | m->m_len = sizeof(struct ip); |
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| 40 | m->m_next = m0; |
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| 41 | |
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| 42 | ip = mtod(m, struct ip *); |
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| 43 | ip->ip_tos = 0; |
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| 44 | ip->ip_off = 0; |
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| 45 | ip->ip_p = proto; |
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| 46 | ip->ip_len = sizeof(struct ip) + len; |
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| 47 | ip->ip_ttl = MAXTTL; |
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| 48 | } else |
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| 49 | ip = mtod(m, struct ip *); |
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| 50 | |
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| 51 | if (rp->rcb_flags & RAW_LADDR) { |
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| 52 | sin = (struct sockaddr_in *)&rp->rcb_laddr; |
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| 53 | if (sin->sin_family != AF_INET) { |
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| 54 | error = EAFNOSUPPORT; |
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| 55 | goto bad; |
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| 56 | } |
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| 57 | ip->ip_src.s_addr = sin->sin_addr.s_addr; |
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| 58 | } else |
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| 59 | ip->ip_src.s_addr = 0; |
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| 60 | |
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| 61 | ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr; |
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| 62 | |
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| 63 | #if BSD>=43 |
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| 64 | return (ip_output(m, rp->rcb_options, &rp->rcb_route, |
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| 65 | (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST)); |
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| 66 | #else |
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| 67 | return (ip_output(m, (struct mbuf *)0, &rp->rcb_route, |
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| 68 | (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST)); |
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| 69 | #endif |
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| 70 | bad: |
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| 71 | m_freem(m); |
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| 72 | return (error); |
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| 73 | } |
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