| | 1 | /* raw_ip.c 4.11 82/04/11 */ |
| | 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 "../net/if.h" |
| | 9 | #include "../net/in.h" |
| | 10 | #include "../net/in_systm.h" |
| | 11 | #include "../net/ip.h" |
| | 12 | #include "../net/ip_var.h" |
| | 13 | #include "../net/raw_cb.h" |
| | 14 | #include <errno.h> |
| | 15 | |
| | 16 | /* |
| | 17 | * Raw interface to IP protocol. |
| | 18 | */ |
| | 19 | |
| | 20 | static struct sockaddr_in ripdst = { AF_INET }; |
| | 21 | static struct sockaddr_in ripsrc = { AF_INET }; |
| | 22 | static struct sockproto ripproto = { PF_INET }; |
| | 23 | /* |
| | 24 | * Setup generic address and protocol structures |
| | 25 | * for raw_input routine, then pass them along with |
| | 26 | * mbuf chain. |
| | 27 | */ |
| | 28 | rip_input(m) |
| | 29 | struct mbuf *m; |
| | 30 | { |
| | 31 | register struct ip *ip = mtod(m, struct ip *); |
| | 32 | |
| | 33 | COUNT(RIP_INPUT); |
| | 34 | ripproto.sp_protocol = ip->ip_p; |
| | 35 | ripdst.sin_addr = ip->ip_dst; |
| | 36 | ripsrc.sin_addr = ip->ip_src; |
| | 37 | raw_input(m, &ripproto, (struct sockaddr *)&ripsrc, |
| | 38 | (struct sockaddr *)&ripdst); |
| | 39 | } |
| | 40 | |
| | 41 | /* |
| | 42 | * Generate IP header and pass packet to ip_output. |
| | 43 | * Tack on options user may have setup with control call. |
| | 44 | */ |
| | 45 | rip_output(m0, so) |
| | 46 | struct mbuf *m0; |
| | 47 | struct socket *so; |
| | 48 | { |
| | 49 | register struct mbuf *m; |
| | 50 | register struct ip *ip; |
| | 51 | int len = 0, error; |
| | 52 | struct rawcb *rp = sotorawcb(so); |
| | 53 | struct ifnet *ifp; |
| | 54 | struct sockaddr_in *src; |
| | 55 | |
| | 56 | COUNT(RIP_OUTPUT); |
| | 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); |
| | 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 | ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr; |
| | 79 | /* local address may not be specified -- XXX */ |
| | 80 | ifp = if_ifonnetof(ip->ip_dst.s_net); |
| | 81 | if (ifp == 0) { |
| | 82 | error = ENETUNREACH; |
| | 83 | goto bad; |
| | 84 | } |
| | 85 | if (rp->rcb_flags & RAW_LADDR) |
| | 86 | src = (struct sockaddr_in *)&rp->rcb_laddr; |
| | 87 | else { |
| | 88 | if (ifp->if_addr.sa_family != AF_INET) { |
| | 89 | error = EAFNOSUPPORT; |
| | 90 | goto bad; |
| | 91 | } |
| | 92 | src = (struct sockaddr_in *)&ifp->if_addr; |
| | 93 | } |
| | 94 | ip->ip_src = src->sin_addr; |
| | 95 | ip->ip_ttl = MAXTTL; |
| | 96 | return (ip_output(m, (struct mbuf *)0, 0, 1)); |
| | 97 | bad: |
| | 98 | m_freem(m); |
| | 99 | return (error); |
| | 100 | } |
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