1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)raw_imp.c 7.1 (Berkeley) 06/04/86 7 */ 8 9 #include "param.h" 10 #include "mbuf.h" 11 #include "socket.h" 12 #include "protosw.h" 13 #include "socketvar.h" 14 #include "errno.h" 15 16 #include "../net/if.h" 17 #include "../net/route.h" 18 #include "../net/raw_cb.h" 19 20 #include "../netinet/in.h" 21 #include "../netinet/in_systm.h" 22 #include "../netinet/in_var.h" 23 #include "if_imp.h" 24 25 /* 26 * Raw interface to IMP. 27 */ 28 29 /* 30 * Generate IMP leader and pass packet to impoutput. 31 * The user must create a skeletal leader in order to 32 * communicate message type, message subtype, etc. 33 * We fill in holes where needed and verify parameters 34 * supplied by user. 35 */ 36 rimp_output(m, so) 37 register struct mbuf *m; 38 struct socket *so; 39 { 40 struct mbuf *n; 41 int len, error = 0; 42 register struct imp_leader *ip; 43 register struct sockaddr_in *sin; 44 register struct rawcb *rp = sotorawcb(so); 45 struct in_ifaddr *ia; 46 struct control_leader *cp; 47 48 /* 49 * Verify user has supplied necessary space 50 * for the leader and check parameters in it. 51 */ 52 if ((m->m_off > MMAXOFF || m->m_len < sizeof(struct control_leader)) && 53 (m = m_pullup(m, sizeof(struct control_leader))) == 0) { 54 error = EMSGSIZE; /* XXX */ 55 goto bad; 56 } 57 cp = mtod(m, struct control_leader *); 58 if (cp->dl_mtype == IMPTYPE_DATA) 59 if (m->m_len < sizeof(struct imp_leader) && 60 (m = m_pullup(m, sizeof(struct imp_leader))) == 0) { 61 error = EMSGSIZE; /* XXX */ 62 goto bad; 63 } 64 ip = mtod(m, struct imp_leader *); 65 if (ip->il_format != IMP_NFF) { 66 error = EMSGSIZE; /* XXX */ 67 goto bad; 68 } 69 #ifdef notdef 70 if (ip->il_link != IMPLINK_IP && 71 (ip->il_link<IMPLINK_LOWEXPER || ip->il_link>IMPLINK_HIGHEXPER)) { 72 error = EPERM; 73 goto bad; 74 } 75 #endif 76 77 /* 78 * Fill in IMP leader -- impoutput refrains from rebuilding 79 * the leader when it sees the protocol family PF_IMPLINK. 80 * (message size calculated by walking through mbuf's) 81 */ 82 for (len = 0, n = m; n; n = n->m_next) 83 len += n->m_len; 84 ip->il_length = htons((u_short)(len << 3)); 85 sin = (struct sockaddr_in *)&rp->rcb_faddr; 86 imp_addr_to_leader(ip, sin->sin_addr.s_addr); /* BRL */ 87 /* no routing here */ 88 ia = in_iaonnetof(in_netof(sin->sin_addr)); 89 if (ia) 90 return (impoutput(ia->ia_ifp, m, (struct sockaddr *)sin)); 91 error = ENETUNREACH; 92 bad: 93 m_freem(m); 94 return (error); 95 } 96