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 } 101