Annotation of src/sys/netinet/raw_ip.c, Revision 1.9
1.1 cgd 1: /*
2: * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
1.3 cgd 33: * from: @(#)raw_ip.c 7.8 (Berkeley) 7/25/90
1.9 ! mycroft 34: * $Id: raw_ip.c,v 1.8 1994/01/08 21:21:55 mycroft Exp $
1.1 cgd 35: */
36:
1.7 mycroft 37: #include <sys/param.h>
38: #include <sys/malloc.h>
39: #include <sys/mbuf.h>
40: #include <sys/socket.h>
41: #include <sys/protosw.h>
42: #include <sys/socketvar.h>
43: #include <sys/errno.h>
1.1 cgd 44:
1.7 mycroft 45: #include <net/if.h>
46: #include <net/route.h>
47: #include <net/raw_cb.h>
1.1 cgd 48:
1.7 mycroft 49: #include <netinet/in.h>
50: #include <netinet/in_systm.h>
51: #include <netinet/ip.h>
52: #include <netinet/ip_var.h>
53: #include <netinet/in_pcb.h>
1.9 ! mycroft 54: #include <netinet/ip_mroute.h>
1.1 cgd 55:
56: /*
57: * Raw interface to IP protocol.
58: */
59: struct sockaddr_in ripdst = { sizeof(ripdst), AF_INET };
60: struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
61: struct sockproto ripproto = { PF_INET };
1.9 ! mycroft 62:
1.1 cgd 63: /*
64: * Setup generic address and protocol structures
65: * for raw_input routine, then pass them along with
66: * mbuf chain.
67: */
1.9 ! mycroft 68: void
1.1 cgd 69: rip_input(m)
70: struct mbuf *m;
71: {
72: register struct ip *ip = mtod(m, struct ip *);
73:
74: ripproto.sp_protocol = ip->ip_p;
75: ripdst.sin_addr = ip->ip_dst;
76: ripsrc.sin_addr = ip->ip_src;
77: if (raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
78: (struct sockaddr *)&ripdst) == 0) {
79: ipstat.ips_noproto++;
80: ipstat.ips_delivered--;
81: }
82: }
83:
84: /*
85: * Generate IP header and pass packet to ip_output.
86: * Tack on options user may have setup with control call.
87: */
88: #define satosin(sa) ((struct sockaddr_in *)(sa))
1.9 ! mycroft 89: int
1.1 cgd 90: rip_output(m, so)
91: register struct mbuf *m;
92: struct socket *so;
93: {
94: register struct ip *ip;
95: register struct raw_inpcb *rp = sotorawinpcb(so);
96: register struct sockaddr_in *sin;
97:
98: /*
99: * If the user handed us a complete IP packet, use it.
100: * Otherwise, allocate an mbuf for a header and fill it in.
101: */
1.4 cgd 102: if (rp->rinp_flags & RINPF_HDRINCL) {
1.1 cgd 103: ip = mtod(m, struct ip *);
1.4 cgd 104: if (ip->ip_len > m->m_pkthdr.len)
105: return EMSGSIZE;
106: ip->ip_len = m->m_pkthdr.len;
107: } else {
1.1 cgd 108: M_PREPEND(m, sizeof(struct ip), M_WAIT);
109: ip = mtod(m, struct ip *);
110: ip->ip_tos = 0;
111: ip->ip_off = 0;
112: ip->ip_p = rp->rinp_rcb.rcb_proto.sp_protocol;
113: ip->ip_len = m->m_pkthdr.len;
114: if (sin = satosin(rp->rinp_rcb.rcb_laddr)) {
115: ip->ip_src = sin->sin_addr;
116: } else
117: ip->ip_src.s_addr = 0;
118: if (sin = satosin(rp->rinp_rcb.rcb_faddr))
119: ip->ip_dst = sin->sin_addr;
120: ip->ip_ttl = MAXTTL;
121: }
122: return (ip_output(m,
123: (rp->rinp_flags & RINPF_HDRINCL)? (struct mbuf *)0: rp->rinp_options,
1.8 mycroft 124: &rp->rinp_route,
1.6 hpeyerl 125: (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
126: #ifdef MULTICAST
127: | IP_MULTICASTOPTS, rp->rinp_rcb.rcb_moptions
128: #endif
129: ));
1.1 cgd 130: }
131:
132: /*
133: * Raw IP socket option processing.
134: */
1.9 ! mycroft 135: int
1.1 cgd 136: rip_ctloutput(op, so, level, optname, m)
137: int op;
138: struct socket *so;
139: int level, optname;
140: struct mbuf **m;
141: {
142: int error = 0;
143: register struct raw_inpcb *rp = sotorawinpcb(so);
144:
145: if (level != IPPROTO_IP)
146: error = EINVAL;
147: else switch (op) {
148:
149: case PRCO_SETOPT:
150: switch (optname) {
151:
152: case IP_OPTIONS:
153: return (ip_pcbopts(&rp->rinp_options, *m));
154:
155: case IP_HDRINCL:
156: if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) {
157: error = EINVAL;
158: break;
159: }
160: if (*mtod(*m, int *))
161: rp->rinp_flags |= RINPF_HDRINCL;
162: else
163: rp->rinp_flags &= ~RINPF_HDRINCL;
164: break;
1.6 hpeyerl 165: #ifdef MULTICAST
166: case IP_MULTICAST_IF:
167: case IP_MULTICAST_TTL:
168: case IP_MULTICAST_LOOP:
169: case IP_ADD_MEMBERSHIP:
170: case IP_DROP_MEMBERSHIP:
171: error = ip_setmoptions(optname,
172: &rp->rinp_rcb.rcb_moptions, *m);
173: break;
174: default:
175: #ifdef MROUTING
176: error = ip_mrouter_cmd(optname, so, *m);
177: #else
178: error = EINVAL;
179: #endif
180: break;
181: #else
1.1 cgd 182: default:
183: error = EINVAL;
184: break;
1.6 hpeyerl 185: #endif
1.1 cgd 186: }
187: break;
188:
189: case PRCO_GETOPT:
190: *m = m_get(M_WAIT, MT_SOOPTS);
191: switch (optname) {
192:
193: case IP_OPTIONS:
194: if (rp->rinp_options) {
195: (*m)->m_len = rp->rinp_options->m_len;
196: bcopy(mtod(rp->rinp_options, caddr_t),
197: mtod(*m, caddr_t), (unsigned)(*m)->m_len);
198: } else
199: (*m)->m_len = 0;
200: break;
201:
202: case IP_HDRINCL:
203: (*m)->m_len = sizeof (int);
204: *mtod(*m, int *) = rp->rinp_flags & RINPF_HDRINCL;
205: break;
1.6 hpeyerl 206: #ifdef MULTICAST
207: case IP_MULTICAST_IF:
208: case IP_MULTICAST_TTL:
209: case IP_MULTICAST_LOOP:
210: case IP_ADD_MEMBERSHIP:
211: case IP_DROP_MEMBERSHIP:
1.8 mycroft 212: error = ip_getmoptions(optname,
213: rp->rinp_rcb.rcb_moptions, m);
214: break;
1.6 hpeyerl 215: #endif
1.1 cgd 216: default:
217: error = EINVAL;
218: m_freem(*m);
219: *m = 0;
220: break;
221: }
222: break;
223: }
224: if (op == PRCO_SETOPT && *m)
225: (void)m_free(*m);
226: return (error);
227: }
228:
229: /*ARGSUSED*/
1.9 ! mycroft 230: int
1.2 cgd 231: rip_usrreq(so, req, m, nam, control)
1.1 cgd 232: register struct socket *so;
233: int req;
1.2 cgd 234: struct mbuf *m, *nam, *control;
1.1 cgd 235: {
236: register int error = 0;
237: register struct raw_inpcb *rp = sotorawinpcb(so);
1.6 hpeyerl 238: #if defined(MULTICAST) && defined(MROUTING)
239: extern struct socket *ip_mrouter;
240: #endif
1.1 cgd 241: switch (req) {
242:
243: case PRU_ATTACH:
244: if (rp)
245: panic("rip_attach");
246: MALLOC(rp, struct raw_inpcb *, sizeof *rp, M_PCB, M_WAITOK);
247: if (rp == 0)
248: return (ENOBUFS);
249: bzero((caddr_t)rp, sizeof *rp);
250: so->so_pcb = (caddr_t)rp;
251: break;
252:
253: case PRU_DETACH:
254: if (rp == 0)
255: panic("rip_detach");
1.6 hpeyerl 256: #if defined(MULTICAST) && defined(MROUTING)
257: if (so == ip_mrouter)
258: ip_mrouter_done();
259: #endif
1.1 cgd 260: if (rp->rinp_options)
261: m_freem(rp->rinp_options);
1.6 hpeyerl 262: #ifdef MULTICAST
263: if (rp->rinp_rcb.rcb_moptions)
264: ip_freemoptions(rp->rinp_rcb.rcb_moptions);
265: #endif
1.1 cgd 266: if (rp->rinp_route.ro_rt)
267: RTFREE(rp->rinp_route.ro_rt);
268: if (rp->rinp_rcb.rcb_laddr)
269: rp->rinp_rcb.rcb_laddr = 0;
270: break;
271:
272: case PRU_BIND:
273: {
274: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
275:
276: if (nam->m_len != sizeof(*addr))
277: return (EINVAL);
278: if ((ifnet == 0) ||
279: ((addr->sin_family != AF_INET) &&
280: (addr->sin_family != AF_IMPLINK)) ||
281: (addr->sin_addr.s_addr &&
282: ifa_ifwithaddr((struct sockaddr *)addr) == 0))
283: return (EADDRNOTAVAIL);
284: rp->rinp_rcb.rcb_laddr = (struct sockaddr *)&rp->rinp_laddr;
285: rp->rinp_laddr = *addr;
286: return (0);
287: }
288: case PRU_CONNECT:
289: {
290: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
291:
292: if (nam->m_len != sizeof(*addr))
293: return (EINVAL);
294: if (ifnet == 0)
295: return (EADDRNOTAVAIL);
296: if ((addr->sin_family != AF_INET) &&
297: (addr->sin_family != AF_IMPLINK))
298: return (EAFNOSUPPORT);
299: rp->rinp_rcb.rcb_faddr = (struct sockaddr *)&rp->rinp_faddr;
300: rp->rinp_faddr = *addr;
301: soisconnected(so);
302: return (0);
303: }
304: }
305: error = raw_usrreq(so, req, m, nam, control);
306:
307: if (error && (req == PRU_ATTACH) && so->so_pcb)
308: free(so->so_pcb, M_PCB);
309: return (error);
310: }
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