1 /* raw_ip.c 4.12 82/06/12 */ 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 "../net/route.h" 15 #include <errno.h> 16 17 /* 18 * Raw interface to IP protocol. 19 */ 20 21 static struct sockaddr_in ripdst = { AF_INET }; 22 static struct sockaddr_in ripsrc = { AF_INET }; 23 static struct sockproto ripproto = { PF_INET }; 24 /* 25 * Setup generic address and protocol structures 26 * for raw_input routine, then pass them along with 27 * mbuf chain. 28 */ 29 rip_input(m) 30 struct mbuf *m; 31 { 32 register struct ip *ip = mtod(m, struct ip *); 33 34 COUNT(RIP_INPUT); 35 ripproto.sp_protocol = ip->ip_p; 36 ripdst.sin_addr = ip->ip_dst; 37 ripsrc.sin_addr = ip->ip_src; 38 raw_input(m, &ripproto, (struct sockaddr *)&ripsrc, 39 (struct sockaddr *)&ripdst); 40 } 41 42 /* 43 * Generate IP header and pass packet to ip_output. 44 * Tack on options user may have setup with control call. 45 */ 46 rip_output(m0, so) 47 struct mbuf *m0; 48 struct socket *so; 49 { 50 register struct mbuf *m; 51 register struct ip *ip; 52 int len = 0, error; 53 struct rawcb *rp = sotorawcb(so); 54 struct ifnet *ifp; 55 struct sockaddr_in *sin; 56 57 COUNT(RIP_OUTPUT); 58 /* 59 * Calculate data length and get an mbuf 60 * for IP header. 61 */ 62 for (m = m0; m; m = m->m_next) 63 len += m->m_len; 64 m = m_get(M_DONTWAIT); 65 if (m == 0) { 66 error = ENOBUFS; 67 goto bad; 68 } 69 70 /* 71 * Fill in IP header as needed. 72 */ 73 m->m_off = MMAXOFF - sizeof(struct ip); 74 m->m_len = sizeof(struct ip); 75 m->m_next = m0; 76 ip = mtod(m, struct ip *); 77 ip->ip_p = so->so_proto->pr_protocol; 78 ip->ip_len = sizeof(struct ip) + len; 79 if (rp->rcb_flags & RAW_LADDR) { 80 sin = (struct sockaddr_in *)&rp->rcb_laddr; 81 if (sin->sin_family != AF_INET) { 82 error = EAFNOSUPPORT; 83 goto bad; 84 } 85 ip->ip_src.s_addr = sin->sin_addr.s_addr; 86 } else 87 ip->ip_src.s_addr = 0; 88 ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr; 89 ip->ip_ttl = MAXTTL; 90 return (ip_output(m, (struct mbuf *)0, &routetoif, 1)); 91 bad: 92 m_freem(m); 93 return (error); 94 } 95