1*6509Ssam /* raw_ip.c 4.10 82/04/10 */ 25123Swnj 35123Swnj #include "../h/param.h" 45123Swnj #include "../h/mbuf.h" 55123Swnj #include "../h/socket.h" 65612Swnj #include "../h/protosw.h" 75123Swnj #include "../h/socketvar.h" 8*6509Ssam #include "../net/if.h" 95123Swnj #include "../net/in.h" 105123Swnj #include "../net/in_systm.h" 115612Swnj #include "../net/ip.h" 125612Swnj #include "../net/ip_var.h" 135612Swnj #include "../net/raw_cb.h" 14*6509Ssam #include <errno.h> 155123Swnj 165123Swnj /* 175612Swnj * Raw interface to IP protocol. 185123Swnj */ 195612Swnj 206339Ssam static struct sockaddr_in ripdst = { AF_INET }; 216339Ssam static struct sockaddr_in ripsrc = { AF_INET }; 226339Ssam static struct sockproto ripproto = { PF_INET }; 235612Swnj /* 245612Swnj * Setup generic address and protocol structures 255612Swnj * for raw_input routine, then pass them along with 265612Swnj * mbuf chain. 275612Swnj */ 285123Swnj rip_input(m) 295123Swnj struct mbuf *m; 305123Swnj { 315612Swnj register struct ip *ip = mtod(m, struct ip *); 325123Swnj 335123Swnj COUNT(RIP_INPUT); 345612Swnj ripproto.sp_protocol = ip->ip_p; 355646Ssam ripdst.sin_addr = ip->ip_dst; 365646Ssam ripsrc.sin_addr = ip->ip_src; 376161Ssam raw_input(m, &ripproto, (struct sockaddr *)&ripdst, 386161Ssam (struct sockaddr *)&ripsrc); 395123Swnj } 405123Swnj 415612Swnj /* 425612Swnj * Generate IP header and pass packet to ip_output. 435612Swnj * Tack on options user may have setup with control call. 445612Swnj */ 455612Swnj rip_output(m0, so) 465612Swnj struct mbuf *m0; 475612Swnj struct socket *so; 485123Swnj { 495612Swnj register struct mbuf *m; 505612Swnj register struct ip *ip; 51*6509Ssam int len = 0, error; 52*6509Ssam struct rawcb *rp = sotorawcb(so); 53*6509Ssam struct ifnet *ifp; 54*6509Ssam struct sockaddr_in *src; 555123Swnj 565123Swnj COUNT(RIP_OUTPUT); 575612Swnj /* 585612Swnj * Calculate data length and get an mbuf 595612Swnj * for IP header. 605612Swnj */ 615612Swnj for (m = m0; m; m = m->m_next) 625612Swnj len += m->m_len; 635612Swnj m = m_get(M_DONTWAIT); 645612Swnj if (m == 0) { 65*6509Ssam error = ENOBUFS; 66*6509Ssam goto bad; 675612Swnj } 685612Swnj 695612Swnj /* 705612Swnj * Fill in IP header as needed. 715612Swnj */ 725612Swnj m->m_off = MMAXOFF - sizeof(struct ip); 735612Swnj m->m_len = sizeof(struct ip); 745612Swnj m->m_next = m0; 755612Swnj ip = mtod(m, struct ip *); 765612Swnj ip->ip_p = so->so_proto->pr_protocol; 775612Swnj ip->ip_len = sizeof(struct ip) + len; 78*6509Ssam ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr; 79*6509Ssam /* local address may not be specified -- XXX */ 80*6509Ssam ifp = if_ifonnetof(ip->ip_dst.s_net); 81*6509Ssam if (ifp == 0) { 82*6509Ssam error = ENETUNREACH; 83*6509Ssam goto bad; 84*6509Ssam } 85*6509Ssam if (rp->rcb_flags & RAW_LADDR) 86*6509Ssam src = (struct sockaddr_in *)&rp->rcb_laddr; 87*6509Ssam else { 88*6509Ssam if (ifp->if_addr.sa_family != AF_INET) { 89*6509Ssam error = EAFNOSUPPORT; 90*6509Ssam goto bad; 91*6509Ssam } 92*6509Ssam src = (struct sockaddr_in *)&ifp->if_addr; 93*6509Ssam } 94*6509Ssam ip->ip_src = src->sin_addr; 955612Swnj ip->ip_ttl = MAXTTL; 966339Ssam return (ip_output(m, (struct mbuf *)0, 0, 1)); 97*6509Ssam bad: 98*6509Ssam m_freem(m); 99*6509Ssam return (error); 1005123Swnj } 101