1 /* raw_ip.c 4.16 82/12/14 */ 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 "../netinet/in.h" 10 #include "../netinet/in_systm.h" 11 #include "../netinet/ip.h" 12 #include "../netinet/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 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 sockaddr_in *sin; 54 55 /* 56 * Calculate data length and get an mbuf 57 * for IP header. 58 */ 59 for (m = m0; m; m = m->m_next) 60 len += m->m_len; 61 m = m_get(M_DONTWAIT, MT_HEADER); 62 if (m == 0) { 63 error = ENOBUFS; 64 goto bad; 65 } 66 67 /* 68 * Fill in IP header as needed. 69 */ 70 m->m_off = MMAXOFF - sizeof(struct ip); 71 m->m_len = sizeof(struct ip); 72 m->m_next = m0; 73 ip = mtod(m, struct ip *); 74 ip->ip_p = so->so_proto->pr_protocol; 75 ip->ip_len = sizeof(struct ip) + len; 76 if (rp->rcb_flags & RAW_LADDR) { 77 sin = (struct sockaddr_in *)&rp->rcb_laddr; 78 if (sin->sin_family != AF_INET) { 79 error = EAFNOSUPPORT; 80 goto bad; 81 } 82 ip->ip_src.s_addr = sin->sin_addr.s_addr; 83 } else 84 ip->ip_src.s_addr = 0; 85 ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr; 86 ip->ip_ttl = MAXTTL; 87 return (ip_output(m, (struct mbuf *)0, &routetoif, 1)); 88 bad: 89 m_freem(m); 90 return (error); 91 } 92