raw_ip.c revision 8876 
1/*
2 * Copyright (c) 1982, 1986, 1988, 1993
3 *	The Regents of the University of California.  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 *
33 *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
34 * $Id: raw_ip.c,v 1.18 1995/05/12 20:00:21 ache Exp $
35 */
36
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>
44#include <sys/systm.h>
45#include <sys/queue.h>
46
47#include <net/if.h>
48#include <net/route.h>
49
50#include <netinet/in.h>
51#include <netinet/in_systm.h>
52#include <netinet/ip.h>
53#include <netinet/ip_var.h>
54#include <netinet/ip_mroute.h>
55#include <netinet/in_pcb.h>
56
57#include <netinet/ip_fw.h>
58
59struct inpcbhead ripcb;
60struct inpcbinfo ripcbinfo;
61
62/*
63 * Nominal space allocated to a raw ip socket.
64 */
65#define	RIPSNDQ		8192
66#define	RIPRCVQ		8192
67
68/*
69 * Raw interface to IP protocol.
70 */
71
72/*
73 * Initialize raw connection block q.
74 */
75void
76rip_init()
77{
78	LIST_INIT(&ripcb);
79	ripcbinfo.listhead = &ripcb;
80	/*
81	 * XXX We don't use the hash list for raw IP, but it's easier
82	 * to allocate a one entry hash list than it is to check all
83	 * over the place for hashbase == NULL.
84	 */
85	ripcbinfo.hashbase = phashinit(1, M_PCB, &ripcbinfo.hashsize);
86}
87
88struct	sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
89/*
90 * Setup generic address and protocol structures
91 * for raw_input routine, then pass them along with
92 * mbuf chain.
93 */
94void
95rip_input(m)
96	struct mbuf *m;
97{
98	register struct ip *ip = mtod(m, struct ip *);
99	register struct inpcb *inp;
100	struct socket *last = 0;
101
102	ripsrc.sin_addr = ip->ip_src;
103	for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
104		if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
105			continue;
106		if (inp->inp_laddr.s_addr &&
107                  inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
108			continue;
109		if (inp->inp_faddr.s_addr &&
110                  inp->inp_faddr.s_addr != ip->ip_src.s_addr)
111			continue;
112		if (last) {
113			struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
114			if (n) {
115				if (sbappendaddr(&last->so_rcv,
116				    (struct sockaddr *)&ripsrc, n,
117				    (struct mbuf *)0) == 0)
118					/* should notify about lost packet */
119					m_freem(n);
120				else
121					sorwakeup(last);
122			}
123		}
124		last = inp->inp_socket;
125	}
126	if (last) {
127		if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc,
128		    m, (struct mbuf *)0) == 0)
129			m_freem(m);
130		else
131			sorwakeup(last);
132	} else {
133		m_freem(m);
134              ipstat.ips_noproto++;
135              ipstat.ips_delivered--;
136      }
137}
138
139void rip_ip_input(mm, ip_mrouter, src)
140      struct mbuf *mm;
141      register struct socket *ip_mrouter;
142      struct sockaddr *src;
143{
144      if (ip_mrouter)
145      {
146              if (sbappendaddr(&ip_mrouter->so_rcv, src,
147                              mm, (struct mbuf *) 0) == 0)
148                      m_freem(mm);
149              else
150                      sorwakeup(ip_mrouter);
151      }
152      else
153      {
154              m_freem(mm);
155		ipstat.ips_noproto++;
156		ipstat.ips_delivered--;
157	}
158}
159
160/*
161 * Generate IP header and pass packet to ip_output.
162 * Tack on options user may have setup with control call.
163 */
164int
165rip_output(m, so, dst)
166	register struct mbuf *m;
167	struct socket *so;
168	u_long dst;
169{
170	register struct ip *ip;
171	register struct inpcb *inp = sotoinpcb(so);
172	struct mbuf *opts;
173	int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
174
175	/*
176	 * If the user handed us a complete IP packet, use it.
177	 * Otherwise, allocate an mbuf for a header and fill it in.
178	 */
179	if ((inp->inp_flags & INP_HDRINCL) == 0) {
180		M_PREPEND(m, sizeof(struct ip), M_WAIT);
181		ip = mtod(m, struct ip *);
182		ip->ip_tos = 0;
183		ip->ip_off = 0;
184		ip->ip_p = inp->inp_ip.ip_p;
185		ip->ip_len = m->m_pkthdr.len;
186		ip->ip_src = inp->inp_laddr;
187		ip->ip_dst.s_addr = dst;
188		ip->ip_ttl = MAXTTL;
189		opts = inp->inp_options;
190	} else {
191		ip = mtod(m, struct ip *);
192		if (ip->ip_id == 0)
193			ip->ip_id = htons(ip_id++);
194		opts = NULL;
195		/* XXX prevent ip_output from overwriting header fields */
196		flags |= IP_RAWOUTPUT;
197		ipstat.ips_rawout++;
198	}
199	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
200}
201
202/*
203 * Raw IP socket option processing.
204 */
205int
206rip_ctloutput(op, so, level, optname, m)
207	int op;
208	struct socket *so;
209	int level, optname;
210	struct mbuf **m;
211{
212	register struct inpcb *inp = sotoinpcb(so);
213	register int error;
214
215	if (level != IPPROTO_IP) {
216		if (op == PRCO_SETOPT && *m)
217			(void)m_free(*m);
218		return (EINVAL);
219	}
220
221	switch (optname) {
222
223	case IP_HDRINCL:
224		if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
225			if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
226				return (EINVAL);
227			if (op == PRCO_SETOPT) {
228				if (*mtod(*m, int *))
229					inp->inp_flags |= INP_HDRINCL;
230				else
231					inp->inp_flags &= ~INP_HDRINCL;
232				(void)m_free(*m);
233			} else {
234				(*m)->m_len = sizeof (int);
235				*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
236			}
237			return (0);
238		}
239		break;
240
241	case IP_FW_ADD:
242	case IP_FW_DEL:
243	case IP_FW_FLUSH:
244	case IP_FW_POLICY:
245		if (ip_fw_ctl_ptr==NULL) {
246			if (*m)
247				(void)m_free(*m);
248			return(EINVAL);
249		}
250
251		if (op == PRCO_SETOPT) {
252			error=(*ip_fw_ctl_ptr)(optname, *m);
253			if (*m)
254				(void)m_free(*m);
255		}
256		else
257			error=EINVAL;
258		return(error);
259
260	case IP_ACCT_DEL:
261	case IP_ACCT_ADD:
262	case IP_ACCT_CLR:
263	case IP_ACCT_FLUSH:
264	case IP_ACCT_ZERO:
265		if (ip_acct_ctl_ptr==NULL) {
266			if (*m)
267				(void)m_free(*m);
268			return(EINVAL);
269		}
270
271		if (op == PRCO_SETOPT) {
272			error=(*ip_acct_ctl_ptr)(optname, *m);
273			if (*m)
274				(void)m_free(*m);
275		}
276		else
277			error=EINVAL;
278		return(error);
279
280	case IP_RSVP_ON:
281		return ip_rsvp_init(so);
282		break;
283
284	case IP_RSVP_OFF:
285		return ip_rsvp_done();
286		break;
287
288	case DVMRP_INIT:
289	case DVMRP_DONE:
290	case DVMRP_ADD_VIF:
291	case DVMRP_DEL_VIF:
292	case DVMRP_ADD_MFC:
293	case DVMRP_DEL_MFC:
294		if (op == PRCO_SETOPT) {
295			error = ip_mrouter_cmd(optname, so, *m);
296			if (*m)
297				(void)m_free(*m);
298		} else
299			error = EINVAL;
300		return (error);
301	}
302	return (ip_ctloutput(op, so, level, optname, m));
303}
304
305u_long	rip_sendspace = RIPSNDQ;
306u_long	rip_recvspace = RIPRCVQ;
307
308/*ARGSUSED*/
309int
310rip_usrreq(so, req, m, nam, control)
311	register struct socket *so;
312	int req;
313	struct mbuf *m, *nam, *control;
314{
315	register int error = 0;
316	register struct inpcb *inp = sotoinpcb(so);
317	switch (req) {
318
319	case PRU_ATTACH:
320		if (inp)
321			panic("rip_attach");
322		if ((so->so_state & SS_PRIV) == 0) {
323			error = EACCES;
324			break;
325		}
326		if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
327		    (error = in_pcballoc(so, &ripcbinfo)))
328			break;
329		inp = (struct inpcb *)so->so_pcb;
330		inp->inp_ip.ip_p = (int)nam;
331		break;
332
333	case PRU_DISCONNECT:
334		if ((so->so_state & SS_ISCONNECTED) == 0) {
335			error = ENOTCONN;
336			break;
337		}
338		/* FALLTHROUGH */
339	case PRU_ABORT:
340		soisdisconnected(so);
341		/* FALLTHROUGH */
342	case PRU_DETACH:
343		if (inp == 0)
344			panic("rip_detach");
345		if (so == ip_mrouter)
346			ip_mrouter_done();
347		if (so == ip_rsvpd)
348			ip_rsvp_done();
349		in_pcbdetach(inp);
350		break;
351
352	case PRU_BIND:
353	    {
354		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
355
356		if (nam->m_len != sizeof(*addr)) {
357			error = EINVAL;
358			break;
359		}
360		if ((ifnet == 0) ||
361		    ((addr->sin_family != AF_INET) &&
362		     (addr->sin_family != AF_IMPLINK)) ||
363		    (addr->sin_addr.s_addr &&
364		     ifa_ifwithaddr((struct sockaddr *)addr) == 0)) {
365			error = EADDRNOTAVAIL;
366			break;
367		}
368		inp->inp_laddr = addr->sin_addr;
369		break;
370	    }
371	case PRU_CONNECT:
372	    {
373		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
374
375		if (nam->m_len != sizeof(*addr)) {
376			error = EINVAL;
377			break;
378		}
379		if (ifnet == 0) {
380			error = EADDRNOTAVAIL;
381			break;
382		}
383		if ((addr->sin_family != AF_INET) &&
384		     (addr->sin_family != AF_IMPLINK)) {
385			error = EAFNOSUPPORT;
386			break;
387		}
388		inp->inp_faddr = addr->sin_addr;
389		soisconnected(so);
390		break;
391	    }
392
393	case PRU_CONNECT2:
394		error = EOPNOTSUPP;
395		break;
396
397	/*
398	 * Mark the connection as being incapable of further input.
399	 */
400	case PRU_SHUTDOWN:
401		socantsendmore(so);
402		break;
403
404	/*
405	 * Ship a packet out.  The appropriate raw output
406	 * routine handles any massaging necessary.
407	 */
408	case PRU_SEND:
409	    {
410		register u_long dst;
411
412		if (so->so_state & SS_ISCONNECTED) {
413			if (nam) {
414				error = EISCONN;
415				break;
416			}
417			dst = inp->inp_faddr.s_addr;
418		} else {
419			if (nam == NULL) {
420				error = ENOTCONN;
421				break;
422			}
423			dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
424		}
425		error = rip_output(m, so, dst);
426		m = NULL;
427		break;
428	    }
429
430	case PRU_SENSE:
431		/*
432		 * stat: don't bother with a blocksize.
433		 */
434		return (0);
435
436	/*
437	 * Not supported.
438	 */
439	case PRU_RCVOOB:
440	case PRU_RCVD:
441	case PRU_LISTEN:
442	case PRU_ACCEPT:
443	case PRU_SENDOOB:
444		error = EOPNOTSUPP;
445		break;
446
447	case PRU_SOCKADDR:
448		in_setsockaddr(inp, nam);
449		break;
450
451	case PRU_PEERADDR:
452		in_setpeeraddr(inp, nam);
453		break;
454
455	default:
456		panic("rip_usrreq");
457	}
458	if (m != NULL)
459		m_freem(m);
460	return (error);
461}
462