1 /*
2 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
3 * All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 *
7 * @(#)raw_imp.c 7.7 (Berkeley) 10/11/92
8 */
9
10 #include <sys/param.h>
11 #include <sys/mbuf.h>
12 #include <sys/socket.h>
13 #include <sys/protosw.h>
14 #include <sys/socketvar.h>
15 #include <sys/errno.h>
16
17 #include <net/if.h>
18 #include <net/route.h>
19 #include <net/raw_cb.h>
20
21 #include <netinet/in.h>
22 #include <netinet/in_systm.h>
23 #include <netinet/in_var.h>
24 #include <netinet/in_pcb.h>
25 #include <netimp/if_imp.h>
26
27 /*
28 * Raw interface to IMP.
29 */
30
31 /*
32 * Generate IMP leader and pass packet to impoutput.
33 * The user must create a skeletal leader in order to
34 * communicate message type, message subtype, etc.
35 * We fill in holes where needed and verify parameters
36 * supplied by user.
37 */
rimp_output(m,so)38 rimp_output(m, so)
39 register struct mbuf *m;
40 struct socket *so;
41 {
42 struct mbuf *n;
43 int len, error = 0;
44 register struct imp_leader *ip;
45 register struct sockaddr_in *sin;
46 register struct raw_inpcb *rp = sotorawinpcb(so);
47 struct in_ifaddr *ia;
48 struct control_leader *cp;
49
50 /*
51 * Verify user has supplied necessary space
52 * for the leader and check parameters in it.
53 */
54 if ((m->m_len < sizeof(struct control_leader)) &&
55 (m = m_pullup(m, sizeof(struct control_leader))) == 0) {
56 error = EMSGSIZE; /* XXX */
57 goto bad;
58 }
59 cp = mtod(m, struct control_leader *);
60 if (cp->dl_mtype == IMPTYPE_DATA)
61 if (m->m_len < sizeof(struct imp_leader) &&
62 (m = m_pullup(m, sizeof(struct imp_leader))) == 0) {
63 error = EMSGSIZE; /* XXX */
64 goto bad;
65 }
66 ip = mtod(m, struct imp_leader *);
67 if (ip->il_format != IMP_NFF) {
68 error = EMSGSIZE; /* XXX */
69 goto bad;
70 }
71 #ifdef notdef
72 if (ip->il_link != IMPLINK_IP &&
73 (ip->il_link<IMPLINK_LOWEXPER || ip->il_link>IMPLINK_HIGHEXPER)) {
74 error = EPERM;
75 goto bad;
76 }
77 #endif
78
79 /*
80 * Fill in IMP leader -- impoutput refrains from rebuilding
81 * the leader when it sees the protocol family PF_IMPLINK.
82 * (message size calculated by walking through mbuf's)
83 */
84 for (len = 0, n = m; n; n = n->m_next)
85 len += n->m_len;
86 ip->il_length = htons((u_short)(len << 3));
87 sin = (struct sockaddr_in *)rp->rinp_rcb.rcb_faddr;
88 imp_addr_to_leader((struct control_leader *)ip, sin->sin_addr.s_addr);
89 /* no routing here */
90 ia = in_iaonnetof(in_netof(sin->sin_addr));
91 if (ia)
92 return (impoutput(ia->ia_ifp, m, (struct sockaddr *)sin));
93 error = ENETUNREACH;
94 bad:
95 m_freem(m);
96 return (error);
97 }
98