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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
| 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
|
29 * $FreeBSD: head/sys/netinet/ip_divert.c 169462 2007-05-11 10:20:51Z rwatson $
| 29 * $FreeBSD: head/sys/netinet/ip_divert.c 171746 2007-08-06 22:06:36Z csjp $
|
30 */
31
32#if !defined(KLD_MODULE)
33#include "opt_inet.h"
34#include "opt_ipfw.h"
35#include "opt_mac.h"
36#ifndef INET
37#error "IPDIVERT requires INET."
38#endif
39#ifndef IPFIREWALL
40#error "IPDIVERT requires IPFIREWALL"
41#endif
42#endif
43
44#include <sys/param.h>
45#include <sys/kernel.h>
46#include <sys/lock.h>
47#include <sys/malloc.h>
48#include <sys/mbuf.h>
49#include <sys/module.h>
50#include <sys/kernel.h>
51#include <sys/priv.h>
52#include <sys/proc.h>
53#include <sys/protosw.h>
54#include <sys/signalvar.h>
55#include <sys/socket.h>
56#include <sys/socketvar.h>
57#include <sys/sx.h>
58#include <sys/sysctl.h>
59#include <sys/systm.h>
60
61#include <vm/uma.h>
62
63#include <net/if.h>
| 30 */
31
32#if !defined(KLD_MODULE)
33#include "opt_inet.h"
34#include "opt_ipfw.h"
35#include "opt_mac.h"
36#ifndef INET
37#error "IPDIVERT requires INET."
38#endif
39#ifndef IPFIREWALL
40#error "IPDIVERT requires IPFIREWALL"
41#endif
42#endif
43
44#include <sys/param.h>
45#include <sys/kernel.h>
46#include <sys/lock.h>
47#include <sys/malloc.h>
48#include <sys/mbuf.h>
49#include <sys/module.h>
50#include <sys/kernel.h>
51#include <sys/priv.h>
52#include <sys/proc.h>
53#include <sys/protosw.h>
54#include <sys/signalvar.h>
55#include <sys/socket.h>
56#include <sys/socketvar.h>
57#include <sys/sx.h>
58#include <sys/sysctl.h>
59#include <sys/systm.h>
60
61#include <vm/uma.h>
62
63#include <net/if.h>
|
| 64#include <net/netisr.h>
|
64#include <net/route.h>
65
66#include <netinet/in.h>
67#include <netinet/in_pcb.h>
68#include <netinet/in_systm.h>
69#include <netinet/in_var.h>
70#include <netinet/ip.h>
71#include <netinet/ip_divert.h>
72#include <netinet/ip_var.h>
73#include <netinet/ip_fw.h>
74
75#include <security/mac/mac_framework.h>
76
77/*
78 * Divert sockets
79 */
80
81/*
82 * Allocate enough space to hold a full IP packet
83 */
84#define DIVSNDQ (65536 + 100)
85#define DIVRCVQ (65536 + 100)
86
87/*
88 * Divert sockets work in conjunction with ipfw, see the divert(4)
89 * manpage for features.
90 * Internally, packets selected by ipfw in ip_input() or ip_output(),
91 * and never diverted before, are passed to the input queue of the
92 * divert socket with a given 'divert_port' number (as specified in
93 * the matching ipfw rule), and they are tagged with a 16 bit cookie
94 * (representing the rule number of the matching ipfw rule), which
95 * is passed to process reading from the socket.
96 *
97 * Packets written to the divert socket are again tagged with a cookie
98 * (usually the same as above) and a destination address.
99 * If the destination address is INADDR_ANY then the packet is
100 * treated as outgoing and sent to ip_output(), otherwise it is
101 * treated as incoming and sent to ip_input().
102 * In both cases, the packet is tagged with the cookie.
103 *
104 * On reinjection, processing in ip_input() and ip_output()
105 * will be exactly the same as for the original packet, except that
106 * ipfw processing will start at the rule number after the one
107 * written in the cookie (so, tagging a packet with a cookie of 0
108 * will cause it to be effectively considered as a standard packet).
109 */
110
111/* Internal variables. */
112static struct inpcbhead divcb;
113static struct inpcbinfo divcbinfo;
114
115static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */
116static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */
117
118/*
119 * Initialize divert connection block queue.
120 */
121static void
122div_zone_change(void *tag)
123{
124
125 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets);
126}
127
128static int
129div_inpcb_init(void *mem, int size, int flags)
130{
131 struct inpcb *inp = mem;
132
133 INP_LOCK_INIT(inp, "inp", "divinp");
134 return (0);
135}
136
137static void
138div_inpcb_fini(void *mem, int size)
139{
140 struct inpcb *inp = mem;
141
142 INP_LOCK_DESTROY(inp);
143}
144
145void
146div_init(void)
147{
148
149 INP_INFO_LOCK_INIT(&divcbinfo, "div");
150 LIST_INIT(&divcb);
151 divcbinfo.ipi_listhead = &divcb;
152 /*
153 * XXX We don't use the hash list for divert IP, but it's easier
154 * to allocate a one entry hash list than it is to check all
155 * over the place for hashbase == NULL.
156 */
157 divcbinfo.ipi_hashbase = hashinit(1, M_PCB, &divcbinfo.ipi_hashmask);
158 divcbinfo.ipi_porthashbase = hashinit(1, M_PCB,
159 &divcbinfo.ipi_porthashmask);
160 divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb),
161 NULL, NULL, div_inpcb_init, div_inpcb_fini, UMA_ALIGN_PTR,
162 UMA_ZONE_NOFREE);
163 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets);
164 EVENTHANDLER_REGISTER(maxsockets_change, div_zone_change,
165 NULL, EVENTHANDLER_PRI_ANY);
166}
167
168/*
169 * IPPROTO_DIVERT is not in the real IP protocol number space; this
170 * function should never be called. Just in case, drop any packets.
171 */
172void
173div_input(struct mbuf *m, int off)
174{
175 ipstat.ips_noproto++;
176 m_freem(m);
177}
178
179/*
180 * Divert a packet by passing it up to the divert socket at port 'port'.
181 *
182 * Setup generic address and protocol structures for div_input routine,
183 * then pass them along with mbuf chain.
184 */
185static void
186divert_packet(struct mbuf *m, int incoming)
187{
188 struct ip *ip;
189 struct inpcb *inp;
190 struct socket *sa;
191 u_int16_t nport;
192 struct sockaddr_in divsrc;
193 struct m_tag *mtag;
194
195 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL);
196 if (mtag == NULL) {
197 printf("%s: no divert tag\n", __func__);
198 m_freem(m);
199 return;
200 }
201 /* Assure header */
202 if (m->m_len < sizeof(struct ip) &&
203 (m = m_pullup(m, sizeof(struct ip))) == 0)
204 return;
205 ip = mtod(m, struct ip *);
206
207 /* Delayed checksums are currently not compatible with divert. */
208 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
209 ip->ip_len = ntohs(ip->ip_len);
210 in_delayed_cksum(m);
211 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
212 ip->ip_len = htons(ip->ip_len);
213 }
214
215 /*
216 * Record receive interface address, if any.
217 * But only for incoming packets.
218 */
219 bzero(&divsrc, sizeof(divsrc));
220 divsrc.sin_len = sizeof(divsrc);
221 divsrc.sin_family = AF_INET;
222 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */
223 if (incoming) {
224 struct ifaddr *ifa;
225
226 /* Sanity check */
227 M_ASSERTPKTHDR(m);
228
229 /* Find IP address for receive interface */
230 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) {
231 if (ifa->ifa_addr->sa_family != AF_INET)
232 continue;
233 divsrc.sin_addr =
234 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr;
235 break;
236 }
237 }
238 /*
239 * Record the incoming interface name whenever we have one.
240 */
241 if (m->m_pkthdr.rcvif) {
242 /*
243 * Hide the actual interface name in there in the
244 * sin_zero array. XXX This needs to be moved to a
245 * different sockaddr type for divert, e.g.
246 * sockaddr_div with multiple fields like
247 * sockaddr_dl. Presently we have only 7 bytes
248 * but that will do for now as most interfaces
249 * are 4 or less + 2 or less bytes for unit.
250 * There is probably a faster way of doing this,
251 * possibly taking it from the sockaddr_dl on the iface.
252 * This solves the problem of a P2P link and a LAN interface
253 * having the same address, which can result in the wrong
254 * interface being assigned to the packet when fed back
255 * into the divert socket. Theoretically if the daemon saves
256 * and re-uses the sockaddr_in as suggested in the man pages,
257 * this iface name will come along for the ride.
258 * (see div_output for the other half of this.)
259 */
260 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname,
261 sizeof(divsrc.sin_zero));
262 }
263
264 /* Put packet on socket queue, if any */
265 sa = NULL;
266 nport = htons((u_int16_t)divert_info(mtag));
267 INP_INFO_RLOCK(&divcbinfo);
268 LIST_FOREACH(inp, &divcb, inp_list) {
269 INP_LOCK(inp);
270 /* XXX why does only one socket match? */
271 if (inp->inp_lport == nport) {
272 sa = inp->inp_socket;
273 SOCKBUF_LOCK(&sa->so_rcv);
274 if (sbappendaddr_locked(&sa->so_rcv,
275 (struct sockaddr *)&divsrc, m,
276 (struct mbuf *)0) == 0) {
277 SOCKBUF_UNLOCK(&sa->so_rcv);
278 sa = NULL; /* force mbuf reclaim below */
279 } else
280 sorwakeup_locked(sa);
281 INP_UNLOCK(inp);
282 break;
283 }
284 INP_UNLOCK(inp);
285 }
286 INP_INFO_RUNLOCK(&divcbinfo);
287 if (sa == NULL) {
288 m_freem(m);
289 ipstat.ips_noproto++;
290 ipstat.ips_delivered--;
291 }
292}
293
294/*
295 * Deliver packet back into the IP processing machinery.
296 *
297 * If no address specified, or address is 0.0.0.0, send to ip_output();
298 * otherwise, send to ip_input() and mark as having been received on
299 * the interface with that address.
300 */
301static int
302div_output(struct socket *so, struct mbuf *m, struct sockaddr_in *sin,
303 struct mbuf *control)
304{
305 struct m_tag *mtag;
306 struct divert_tag *dt;
307 int error = 0;
| 65#include <net/route.h>
66
67#include <netinet/in.h>
68#include <netinet/in_pcb.h>
69#include <netinet/in_systm.h>
70#include <netinet/in_var.h>
71#include <netinet/ip.h>
72#include <netinet/ip_divert.h>
73#include <netinet/ip_var.h>
74#include <netinet/ip_fw.h>
75
76#include <security/mac/mac_framework.h>
77
78/*
79 * Divert sockets
80 */
81
82/*
83 * Allocate enough space to hold a full IP packet
84 */
85#define DIVSNDQ (65536 + 100)
86#define DIVRCVQ (65536 + 100)
87
88/*
89 * Divert sockets work in conjunction with ipfw, see the divert(4)
90 * manpage for features.
91 * Internally, packets selected by ipfw in ip_input() or ip_output(),
92 * and never diverted before, are passed to the input queue of the
93 * divert socket with a given 'divert_port' number (as specified in
94 * the matching ipfw rule), and they are tagged with a 16 bit cookie
95 * (representing the rule number of the matching ipfw rule), which
96 * is passed to process reading from the socket.
97 *
98 * Packets written to the divert socket are again tagged with a cookie
99 * (usually the same as above) and a destination address.
100 * If the destination address is INADDR_ANY then the packet is
101 * treated as outgoing and sent to ip_output(), otherwise it is
102 * treated as incoming and sent to ip_input().
103 * In both cases, the packet is tagged with the cookie.
104 *
105 * On reinjection, processing in ip_input() and ip_output()
106 * will be exactly the same as for the original packet, except that
107 * ipfw processing will start at the rule number after the one
108 * written in the cookie (so, tagging a packet with a cookie of 0
109 * will cause it to be effectively considered as a standard packet).
110 */
111
112/* Internal variables. */
113static struct inpcbhead divcb;
114static struct inpcbinfo divcbinfo;
115
116static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */
117static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */
118
119/*
120 * Initialize divert connection block queue.
121 */
122static void
123div_zone_change(void *tag)
124{
125
126 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets);
127}
128
129static int
130div_inpcb_init(void *mem, int size, int flags)
131{
132 struct inpcb *inp = mem;
133
134 INP_LOCK_INIT(inp, "inp", "divinp");
135 return (0);
136}
137
138static void
139div_inpcb_fini(void *mem, int size)
140{
141 struct inpcb *inp = mem;
142
143 INP_LOCK_DESTROY(inp);
144}
145
146void
147div_init(void)
148{
149
150 INP_INFO_LOCK_INIT(&divcbinfo, "div");
151 LIST_INIT(&divcb);
152 divcbinfo.ipi_listhead = &divcb;
153 /*
154 * XXX We don't use the hash list for divert IP, but it's easier
155 * to allocate a one entry hash list than it is to check all
156 * over the place for hashbase == NULL.
157 */
158 divcbinfo.ipi_hashbase = hashinit(1, M_PCB, &divcbinfo.ipi_hashmask);
159 divcbinfo.ipi_porthashbase = hashinit(1, M_PCB,
160 &divcbinfo.ipi_porthashmask);
161 divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb),
162 NULL, NULL, div_inpcb_init, div_inpcb_fini, UMA_ALIGN_PTR,
163 UMA_ZONE_NOFREE);
164 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets);
165 EVENTHANDLER_REGISTER(maxsockets_change, div_zone_change,
166 NULL, EVENTHANDLER_PRI_ANY);
167}
168
169/*
170 * IPPROTO_DIVERT is not in the real IP protocol number space; this
171 * function should never be called. Just in case, drop any packets.
172 */
173void
174div_input(struct mbuf *m, int off)
175{
176 ipstat.ips_noproto++;
177 m_freem(m);
178}
179
180/*
181 * Divert a packet by passing it up to the divert socket at port 'port'.
182 *
183 * Setup generic address and protocol structures for div_input routine,
184 * then pass them along with mbuf chain.
185 */
186static void
187divert_packet(struct mbuf *m, int incoming)
188{
189 struct ip *ip;
190 struct inpcb *inp;
191 struct socket *sa;
192 u_int16_t nport;
193 struct sockaddr_in divsrc;
194 struct m_tag *mtag;
195
196 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL);
197 if (mtag == NULL) {
198 printf("%s: no divert tag\n", __func__);
199 m_freem(m);
200 return;
201 }
202 /* Assure header */
203 if (m->m_len < sizeof(struct ip) &&
204 (m = m_pullup(m, sizeof(struct ip))) == 0)
205 return;
206 ip = mtod(m, struct ip *);
207
208 /* Delayed checksums are currently not compatible with divert. */
209 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
210 ip->ip_len = ntohs(ip->ip_len);
211 in_delayed_cksum(m);
212 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
213 ip->ip_len = htons(ip->ip_len);
214 }
215
216 /*
217 * Record receive interface address, if any.
218 * But only for incoming packets.
219 */
220 bzero(&divsrc, sizeof(divsrc));
221 divsrc.sin_len = sizeof(divsrc);
222 divsrc.sin_family = AF_INET;
223 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */
224 if (incoming) {
225 struct ifaddr *ifa;
226
227 /* Sanity check */
228 M_ASSERTPKTHDR(m);
229
230 /* Find IP address for receive interface */
231 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) {
232 if (ifa->ifa_addr->sa_family != AF_INET)
233 continue;
234 divsrc.sin_addr =
235 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr;
236 break;
237 }
238 }
239 /*
240 * Record the incoming interface name whenever we have one.
241 */
242 if (m->m_pkthdr.rcvif) {
243 /*
244 * Hide the actual interface name in there in the
245 * sin_zero array. XXX This needs to be moved to a
246 * different sockaddr type for divert, e.g.
247 * sockaddr_div with multiple fields like
248 * sockaddr_dl. Presently we have only 7 bytes
249 * but that will do for now as most interfaces
250 * are 4 or less + 2 or less bytes for unit.
251 * There is probably a faster way of doing this,
252 * possibly taking it from the sockaddr_dl on the iface.
253 * This solves the problem of a P2P link and a LAN interface
254 * having the same address, which can result in the wrong
255 * interface being assigned to the packet when fed back
256 * into the divert socket. Theoretically if the daemon saves
257 * and re-uses the sockaddr_in as suggested in the man pages,
258 * this iface name will come along for the ride.
259 * (see div_output for the other half of this.)
260 */
261 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname,
262 sizeof(divsrc.sin_zero));
263 }
264
265 /* Put packet on socket queue, if any */
266 sa = NULL;
267 nport = htons((u_int16_t)divert_info(mtag));
268 INP_INFO_RLOCK(&divcbinfo);
269 LIST_FOREACH(inp, &divcb, inp_list) {
270 INP_LOCK(inp);
271 /* XXX why does only one socket match? */
272 if (inp->inp_lport == nport) {
273 sa = inp->inp_socket;
274 SOCKBUF_LOCK(&sa->so_rcv);
275 if (sbappendaddr_locked(&sa->so_rcv,
276 (struct sockaddr *)&divsrc, m,
277 (struct mbuf *)0) == 0) {
278 SOCKBUF_UNLOCK(&sa->so_rcv);
279 sa = NULL; /* force mbuf reclaim below */
280 } else
281 sorwakeup_locked(sa);
282 INP_UNLOCK(inp);
283 break;
284 }
285 INP_UNLOCK(inp);
286 }
287 INP_INFO_RUNLOCK(&divcbinfo);
288 if (sa == NULL) {
289 m_freem(m);
290 ipstat.ips_noproto++;
291 ipstat.ips_delivered--;
292 }
293}
294
295/*
296 * Deliver packet back into the IP processing machinery.
297 *
298 * If no address specified, or address is 0.0.0.0, send to ip_output();
299 * otherwise, send to ip_input() and mark as having been received on
300 * the interface with that address.
301 */
302static int
303div_output(struct socket *so, struct mbuf *m, struct sockaddr_in *sin,
304 struct mbuf *control)
305{
306 struct m_tag *mtag;
307 struct divert_tag *dt;
308 int error = 0;
|
| 309 struct mbuf *options;
|
308
309 /*
310 * An mbuf may hasn't come from userland, but we pretend
311 * that it has.
312 */
313 m->m_pkthdr.rcvif = NULL;
314 m->m_nextpkt = NULL;
315
316 if (control)
317 m_freem(control); /* XXX */
318
319 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) {
320 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag),
321 M_NOWAIT | M_ZERO);
322 if (mtag == NULL) {
323 error = ENOBUFS;
324 goto cantsend;
325 }
326 dt = (struct divert_tag *)(mtag+1);
327 m_tag_prepend(m, mtag);
328 } else
329 dt = (struct divert_tag *)(mtag+1);
330
331 /* Loopback avoidance and state recovery */
332 if (sin) {
333 int i;
334
335 dt->cookie = sin->sin_port;
336 /*
337 * Find receive interface with the given name, stuffed
338 * (if it exists) in the sin_zero[] field.
339 * The name is user supplied data so don't trust its size
340 * or that it is zero terminated.
341 */
342 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++)
343 ;
344 if ( i > 0 && i < sizeof(sin->sin_zero))
345 m->m_pkthdr.rcvif = ifunit(sin->sin_zero);
346 }
347
348 /* Reinject packet into the system as incoming or outgoing */
349 if (!sin || sin->sin_addr.s_addr == 0) {
350 struct ip *const ip = mtod(m, struct ip *);
351 struct inpcb *inp;
352
353 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG;
354 INP_INFO_WLOCK(&divcbinfo);
355 inp = sotoinpcb(so);
356 INP_LOCK(inp);
357 /*
358 * Don't allow both user specified and setsockopt options,
359 * and don't allow packet length sizes that will crash
360 */
361 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) ||
362 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) {
363 error = EINVAL;
| 310
311 /*
312 * An mbuf may hasn't come from userland, but we pretend
313 * that it has.
314 */
315 m->m_pkthdr.rcvif = NULL;
316 m->m_nextpkt = NULL;
317
318 if (control)
319 m_freem(control); /* XXX */
320
321 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) {
322 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag),
323 M_NOWAIT | M_ZERO);
324 if (mtag == NULL) {
325 error = ENOBUFS;
326 goto cantsend;
327 }
328 dt = (struct divert_tag *)(mtag+1);
329 m_tag_prepend(m, mtag);
330 } else
331 dt = (struct divert_tag *)(mtag+1);
332
333 /* Loopback avoidance and state recovery */
334 if (sin) {
335 int i;
336
337 dt->cookie = sin->sin_port;
338 /*
339 * Find receive interface with the given name, stuffed
340 * (if it exists) in the sin_zero[] field.
341 * The name is user supplied data so don't trust its size
342 * or that it is zero terminated.
343 */
344 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++)
345 ;
346 if ( i > 0 && i < sizeof(sin->sin_zero))
347 m->m_pkthdr.rcvif = ifunit(sin->sin_zero);
348 }
349
350 /* Reinject packet into the system as incoming or outgoing */
351 if (!sin || sin->sin_addr.s_addr == 0) {
352 struct ip *const ip = mtod(m, struct ip *);
353 struct inpcb *inp;
354
355 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG;
356 INP_INFO_WLOCK(&divcbinfo);
357 inp = sotoinpcb(so);
358 INP_LOCK(inp);
359 /*
360 * Don't allow both user specified and setsockopt options,
361 * and don't allow packet length sizes that will crash
362 */
363 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) ||
364 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) {
365 error = EINVAL;
|
| 366 INP_UNLOCK(inp);
367 INP_INFO_WUNLOCK(&divcbinfo);
|
364 m_freem(m);
365 } else {
366 /* Convert fields to host order for ip_output() */
367 ip->ip_len = ntohs(ip->ip_len);
368 ip->ip_off = ntohs(ip->ip_off);
369
370 /* Send packet to output processing */
371 ipstat.ips_rawout++; /* XXX */
372
373#ifdef MAC
374 mac_create_mbuf_from_inpcb(inp, m);
375#endif
| 368 m_freem(m);
369 } else {
370 /* Convert fields to host order for ip_output() */
371 ip->ip_len = ntohs(ip->ip_len);
372 ip->ip_off = ntohs(ip->ip_off);
373
374 /* Send packet to output processing */
375 ipstat.ips_rawout++; /* XXX */
376
377#ifdef MAC
378 mac_create_mbuf_from_inpcb(inp, m);
379#endif
|
376 error = ip_output(m,
377 inp->inp_options, NULL,
378 ((so->so_options & SO_DONTROUTE) ?
379 IP_ROUTETOIF : 0) |
380 IP_ALLOWBROADCAST | IP_RAWOUTPUT,
381 inp->inp_moptions, NULL);
| 380 /*
381 * Get ready to inject the packet into ip_output().
382 * Just in case socket options were specified on the
383 * divert socket, we duplicate them. This is done
384 * to avoid having to hold the PCB locks over the call
385 * to ip_output(), as doing this results in a number of
386 * lock ordering complexities.
387 *
388 * Note that we set the multicast options argument for
389 * ip_output() to NULL since it should be invariant that
390 * they are not present.
391 */
392 KASSERT(inp->inp_moptions == NULL,
393 ("multicast options set on a divert socket"));
394 options = NULL;
395 /*
396 * XXXCSJP: It is unclear to me whether or not it makes
397 * sense for divert sockets to have options. However,
398 * for now we will duplicate them with the INP locks
399 * held so we can use them in ip_output() without
400 * requring a reference to the pcb.
401 */
402 if (inp->inp_options != NULL) {
403 options = m_dup(inp->inp_options, M_DONTWAIT);
404 if (options == NULL)
405 error = ENOBUFS;
406 }
407 INP_UNLOCK(inp);
408 INP_INFO_WUNLOCK(&divcbinfo);
409 if (error == ENOBUFS) {
410 m_freem(m);
411 return (error);
412 }
413 error = ip_output(m, options, NULL,
414 ((so->so_options & SO_DONTROUTE) ?
415 IP_ROUTETOIF : 0) | IP_ALLOWBROADCAST |
416 IP_RAWOUTPUT, NULL, NULL);
417 if (options != NULL)
418 m_freem(options);
|
382 }
| 419 }
|
383 INP_UNLOCK(inp);
384 INP_INFO_WUNLOCK(&divcbinfo);
| |
385 } else {
386 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG;
387 if (m->m_pkthdr.rcvif == NULL) {
388 /*
389 * No luck with the name, check by IP address.
390 * Clear the port and the ifname to make sure
391 * there are no distractions for ifa_ifwithaddr.
392 */
393 struct ifaddr *ifa;
394
395 bzero(sin->sin_zero, sizeof(sin->sin_zero));
396 sin->sin_port = 0;
397 ifa = ifa_ifwithaddr((struct sockaddr *) sin);
398 if (ifa == NULL) {
399 error = EADDRNOTAVAIL;
400 goto cantsend;
401 }
402 m->m_pkthdr.rcvif = ifa->ifa_ifp;
403 }
404#ifdef MAC
405 SOCK_LOCK(so);
406 mac_create_mbuf_from_socket(so, m);
407 SOCK_UNLOCK(so);
408#endif
| 420 } else {
421 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG;
422 if (m->m_pkthdr.rcvif == NULL) {
423 /*
424 * No luck with the name, check by IP address.
425 * Clear the port and the ifname to make sure
426 * there are no distractions for ifa_ifwithaddr.
427 */
428 struct ifaddr *ifa;
429
430 bzero(sin->sin_zero, sizeof(sin->sin_zero));
431 sin->sin_port = 0;
432 ifa = ifa_ifwithaddr((struct sockaddr *) sin);
433 if (ifa == NULL) {
434 error = EADDRNOTAVAIL;
435 goto cantsend;
436 }
437 m->m_pkthdr.rcvif = ifa->ifa_ifp;
438 }
439#ifdef MAC
440 SOCK_LOCK(so);
441 mac_create_mbuf_from_socket(so, m);
442 SOCK_UNLOCK(so);
443#endif
|
409 /* Send packet to input processing */
410 ip_input(m);
| 444 /* Send packet to input processing via netisr */
445 netisr_queue(NETISR_IP, m);
|
411 }
412
413 return error;
414
415cantsend:
416 m_freem(m);
417 return error;
418}
419
420static int
421div_attach(struct socket *so, int proto, struct thread *td)
422{
423 struct inpcb *inp;
424 int error;
425
426 inp = sotoinpcb(so);
427 KASSERT(inp == NULL, ("div_attach: inp != NULL"));
428 if (td != NULL) {
429 error = priv_check(td, PRIV_NETINET_DIVERT);
430 if (error)
431 return (error);
432 }
433 error = soreserve(so, div_sendspace, div_recvspace);
434 if (error)
435 return error;
436 INP_INFO_WLOCK(&divcbinfo);
437 error = in_pcballoc(so, &divcbinfo);
438 if (error) {
439 INP_INFO_WUNLOCK(&divcbinfo);
440 return error;
441 }
442 inp = (struct inpcb *)so->so_pcb;
443 INP_INFO_WUNLOCK(&divcbinfo);
444 inp->inp_ip_p = proto;
445 inp->inp_vflag |= INP_IPV4;
446 inp->inp_flags |= INP_HDRINCL;
447 INP_UNLOCK(inp);
448 return 0;
449}
450
451static void
452div_detach(struct socket *so)
453{
454 struct inpcb *inp;
455
456 inp = sotoinpcb(so);
457 KASSERT(inp != NULL, ("div_detach: inp == NULL"));
458 INP_INFO_WLOCK(&divcbinfo);
459 INP_LOCK(inp);
460 in_pcbdetach(inp);
461 in_pcbfree(inp);
462 INP_INFO_WUNLOCK(&divcbinfo);
463}
464
465static int
466div_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
467{
468 struct inpcb *inp;
469 int error;
470
471 inp = sotoinpcb(so);
472 KASSERT(inp != NULL, ("div_bind: inp == NULL"));
473 /* in_pcbbind assumes that nam is a sockaddr_in
474 * and in_pcbbind requires a valid address. Since divert
475 * sockets don't we need to make sure the address is
476 * filled in properly.
477 * XXX -- divert should not be abusing in_pcbind
478 * and should probably have its own family.
479 */
480 if (nam->sa_family != AF_INET)
481 return EAFNOSUPPORT;
482 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY;
483 INP_INFO_WLOCK(&divcbinfo);
484 INP_LOCK(inp);
485 error = in_pcbbind(inp, nam, td->td_ucred);
486 INP_UNLOCK(inp);
487 INP_INFO_WUNLOCK(&divcbinfo);
488 return error;
489}
490
491static int
492div_shutdown(struct socket *so)
493{
494 struct inpcb *inp;
495
496 inp = sotoinpcb(so);
497 KASSERT(inp != NULL, ("div_shutdown: inp == NULL"));
498 INP_LOCK(inp);
499 socantsendmore(so);
500 INP_UNLOCK(inp);
501 return 0;
502}
503
504static int
505div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
506 struct mbuf *control, struct thread *td)
507{
508 /* Packet must have a header (but that's about it) */
509 if (m->m_len < sizeof (struct ip) &&
510 (m = m_pullup(m, sizeof (struct ip))) == 0) {
511 ipstat.ips_toosmall++;
512 m_freem(m);
513 return EINVAL;
514 }
515
516 /* Send packet */
517 return div_output(so, m, (struct sockaddr_in *)nam, control);
518}
519
520void
521div_ctlinput(int cmd, struct sockaddr *sa, void *vip)
522{
523 struct in_addr faddr;
524
525 faddr = ((struct sockaddr_in *)sa)->sin_addr;
526 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
527 return;
528 if (PRC_IS_REDIRECT(cmd))
529 return;
530}
531
532static int
533div_pcblist(SYSCTL_HANDLER_ARGS)
534{
535 int error, i, n;
536 struct inpcb *inp, **inp_list;
537 inp_gen_t gencnt;
538 struct xinpgen xig;
539
540 /*
541 * The process of preparing the TCB list is too time-consuming and
542 * resource-intensive to repeat twice on every request.
543 */
544 if (req->oldptr == 0) {
545 n = divcbinfo.ipi_count;
546 req->oldidx = 2 * (sizeof xig)
547 + (n + n/8) * sizeof(struct xinpcb);
548 return 0;
549 }
550
551 if (req->newptr != 0)
552 return EPERM;
553
554 /*
555 * OK, now we're committed to doing something.
556 */
557 INP_INFO_RLOCK(&divcbinfo);
558 gencnt = divcbinfo.ipi_gencnt;
559 n = divcbinfo.ipi_count;
560 INP_INFO_RUNLOCK(&divcbinfo);
561
562 error = sysctl_wire_old_buffer(req,
563 2 * sizeof(xig) + n*sizeof(struct xinpcb));
564 if (error != 0)
565 return (error);
566
567 xig.xig_len = sizeof xig;
568 xig.xig_count = n;
569 xig.xig_gen = gencnt;
570 xig.xig_sogen = so_gencnt;
571 error = SYSCTL_OUT(req, &xig, sizeof xig);
572 if (error)
573 return error;
574
575 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
576 if (inp_list == 0)
577 return ENOMEM;
578
579 INP_INFO_RLOCK(&divcbinfo);
580 for (inp = LIST_FIRST(divcbinfo.ipi_listhead), i = 0; inp && i < n;
581 inp = LIST_NEXT(inp, inp_list)) {
582 INP_LOCK(inp);
583 if (inp->inp_gencnt <= gencnt &&
584 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
585 inp_list[i++] = inp;
586 INP_UNLOCK(inp);
587 }
588 INP_INFO_RUNLOCK(&divcbinfo);
589 n = i;
590
591 error = 0;
592 for (i = 0; i < n; i++) {
593 inp = inp_list[i];
594 INP_LOCK(inp);
595 if (inp->inp_gencnt <= gencnt) {
596 struct xinpcb xi;
597 bzero(&xi, sizeof(xi));
598 xi.xi_len = sizeof xi;
599 /* XXX should avoid extra copy */
600 bcopy(inp, &xi.xi_inp, sizeof *inp);
601 if (inp->inp_socket)
602 sotoxsocket(inp->inp_socket, &xi.xi_socket);
603 INP_UNLOCK(inp);
604 error = SYSCTL_OUT(req, &xi, sizeof xi);
605 } else
606 INP_UNLOCK(inp);
607 }
608 if (!error) {
609 /*
610 * Give the user an updated idea of our state.
611 * If the generation differs from what we told
612 * her before, she knows that something happened
613 * while we were processing this request, and it
614 * might be necessary to retry.
615 */
616 INP_INFO_RLOCK(&divcbinfo);
617 xig.xig_gen = divcbinfo.ipi_gencnt;
618 xig.xig_sogen = so_gencnt;
619 xig.xig_count = divcbinfo.ipi_count;
620 INP_INFO_RUNLOCK(&divcbinfo);
621 error = SYSCTL_OUT(req, &xig, sizeof xig);
622 }
623 free(inp_list, M_TEMP);
624 return error;
625}
626
627#ifdef SYSCTL_NODE
628SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT");
629SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0,
630 div_pcblist, "S,xinpcb", "List of active divert sockets");
631#endif
632
633struct pr_usrreqs div_usrreqs = {
634 .pru_attach = div_attach,
635 .pru_bind = div_bind,
636 .pru_control = in_control,
637 .pru_detach = div_detach,
638 .pru_peeraddr = in_getpeeraddr,
639 .pru_send = div_send,
640 .pru_shutdown = div_shutdown,
641 .pru_sockaddr = in_getsockaddr,
642 .pru_sosetlabel = in_pcbsosetlabel
643};
644
645struct protosw div_protosw = {
646 .pr_type = SOCK_RAW,
647 .pr_protocol = IPPROTO_DIVERT,
648 .pr_flags = PR_ATOMIC|PR_ADDR,
649 .pr_input = div_input,
650 .pr_ctlinput = div_ctlinput,
651 .pr_ctloutput = ip_ctloutput,
652 .pr_init = div_init,
653 .pr_usrreqs = &div_usrreqs
654};
655
656static int
657div_modevent(module_t mod, int type, void *unused)
658{
659 int err = 0;
660 int n;
661
662 switch (type) {
663 case MOD_LOAD:
664 /*
665 * Protocol will be initialized by pf_proto_register().
666 * We don't have to register ip_protox because we are not
667 * a true IP protocol that goes over the wire.
668 */
669 err = pf_proto_register(PF_INET, &div_protosw);
670 ip_divert_ptr = divert_packet;
671 break;
672 case MOD_QUIESCE:
673 /*
674 * IPDIVERT may normally not be unloaded because of the
675 * potential race conditions. Tell kldunload we can't be
676 * unloaded unless the unload is forced.
677 */
678 err = EPERM;
679 break;
680 case MOD_UNLOAD:
681 /*
682 * Forced unload.
683 *
684 * Module ipdivert can only be unloaded if no sockets are
685 * connected. Maybe this can be changed later to forcefully
686 * disconnect any open sockets.
687 *
688 * XXXRW: Note that there is a slight race here, as a new
689 * socket open request could be spinning on the lock and then
690 * we destroy the lock.
691 */
692 INP_INFO_WLOCK(&divcbinfo);
693 n = divcbinfo.ipi_count;
694 if (n != 0) {
695 err = EBUSY;
696 INP_INFO_WUNLOCK(&divcbinfo);
697 break;
698 }
699 ip_divert_ptr = NULL;
700 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW);
701 INP_INFO_WUNLOCK(&divcbinfo);
702 INP_INFO_LOCK_DESTROY(&divcbinfo);
703 uma_zdestroy(divcbinfo.ipi_zone);
704 break;
705 default:
706 err = EOPNOTSUPP;
707 break;
708 }
709 return err;
710}
711
712static moduledata_t ipdivertmod = {
713 "ipdivert",
714 div_modevent,
715 0
716};
717
718DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
719MODULE_DEPEND(dummynet, ipfw, 2, 2, 2);
720MODULE_VERSION(ipdivert, 1);
| 446 }
447
448 return error;
449
450cantsend:
451 m_freem(m);
452 return error;
453}
454
455static int
456div_attach(struct socket *so, int proto, struct thread *td)
457{
458 struct inpcb *inp;
459 int error;
460
461 inp = sotoinpcb(so);
462 KASSERT(inp == NULL, ("div_attach: inp != NULL"));
463 if (td != NULL) {
464 error = priv_check(td, PRIV_NETINET_DIVERT);
465 if (error)
466 return (error);
467 }
468 error = soreserve(so, div_sendspace, div_recvspace);
469 if (error)
470 return error;
471 INP_INFO_WLOCK(&divcbinfo);
472 error = in_pcballoc(so, &divcbinfo);
473 if (error) {
474 INP_INFO_WUNLOCK(&divcbinfo);
475 return error;
476 }
477 inp = (struct inpcb *)so->so_pcb;
478 INP_INFO_WUNLOCK(&divcbinfo);
479 inp->inp_ip_p = proto;
480 inp->inp_vflag |= INP_IPV4;
481 inp->inp_flags |= INP_HDRINCL;
482 INP_UNLOCK(inp);
483 return 0;
484}
485
486static void
487div_detach(struct socket *so)
488{
489 struct inpcb *inp;
490
491 inp = sotoinpcb(so);
492 KASSERT(inp != NULL, ("div_detach: inp == NULL"));
493 INP_INFO_WLOCK(&divcbinfo);
494 INP_LOCK(inp);
495 in_pcbdetach(inp);
496 in_pcbfree(inp);
497 INP_INFO_WUNLOCK(&divcbinfo);
498}
499
500static int
501div_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
502{
503 struct inpcb *inp;
504 int error;
505
506 inp = sotoinpcb(so);
507 KASSERT(inp != NULL, ("div_bind: inp == NULL"));
508 /* in_pcbbind assumes that nam is a sockaddr_in
509 * and in_pcbbind requires a valid address. Since divert
510 * sockets don't we need to make sure the address is
511 * filled in properly.
512 * XXX -- divert should not be abusing in_pcbind
513 * and should probably have its own family.
514 */
515 if (nam->sa_family != AF_INET)
516 return EAFNOSUPPORT;
517 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY;
518 INP_INFO_WLOCK(&divcbinfo);
519 INP_LOCK(inp);
520 error = in_pcbbind(inp, nam, td->td_ucred);
521 INP_UNLOCK(inp);
522 INP_INFO_WUNLOCK(&divcbinfo);
523 return error;
524}
525
526static int
527div_shutdown(struct socket *so)
528{
529 struct inpcb *inp;
530
531 inp = sotoinpcb(so);
532 KASSERT(inp != NULL, ("div_shutdown: inp == NULL"));
533 INP_LOCK(inp);
534 socantsendmore(so);
535 INP_UNLOCK(inp);
536 return 0;
537}
538
539static int
540div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
541 struct mbuf *control, struct thread *td)
542{
543 /* Packet must have a header (but that's about it) */
544 if (m->m_len < sizeof (struct ip) &&
545 (m = m_pullup(m, sizeof (struct ip))) == 0) {
546 ipstat.ips_toosmall++;
547 m_freem(m);
548 return EINVAL;
549 }
550
551 /* Send packet */
552 return div_output(so, m, (struct sockaddr_in *)nam, control);
553}
554
555void
556div_ctlinput(int cmd, struct sockaddr *sa, void *vip)
557{
558 struct in_addr faddr;
559
560 faddr = ((struct sockaddr_in *)sa)->sin_addr;
561 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
562 return;
563 if (PRC_IS_REDIRECT(cmd))
564 return;
565}
566
567static int
568div_pcblist(SYSCTL_HANDLER_ARGS)
569{
570 int error, i, n;
571 struct inpcb *inp, **inp_list;
572 inp_gen_t gencnt;
573 struct xinpgen xig;
574
575 /*
576 * The process of preparing the TCB list is too time-consuming and
577 * resource-intensive to repeat twice on every request.
578 */
579 if (req->oldptr == 0) {
580 n = divcbinfo.ipi_count;
581 req->oldidx = 2 * (sizeof xig)
582 + (n + n/8) * sizeof(struct xinpcb);
583 return 0;
584 }
585
586 if (req->newptr != 0)
587 return EPERM;
588
589 /*
590 * OK, now we're committed to doing something.
591 */
592 INP_INFO_RLOCK(&divcbinfo);
593 gencnt = divcbinfo.ipi_gencnt;
594 n = divcbinfo.ipi_count;
595 INP_INFO_RUNLOCK(&divcbinfo);
596
597 error = sysctl_wire_old_buffer(req,
598 2 * sizeof(xig) + n*sizeof(struct xinpcb));
599 if (error != 0)
600 return (error);
601
602 xig.xig_len = sizeof xig;
603 xig.xig_count = n;
604 xig.xig_gen = gencnt;
605 xig.xig_sogen = so_gencnt;
606 error = SYSCTL_OUT(req, &xig, sizeof xig);
607 if (error)
608 return error;
609
610 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
611 if (inp_list == 0)
612 return ENOMEM;
613
614 INP_INFO_RLOCK(&divcbinfo);
615 for (inp = LIST_FIRST(divcbinfo.ipi_listhead), i = 0; inp && i < n;
616 inp = LIST_NEXT(inp, inp_list)) {
617 INP_LOCK(inp);
618 if (inp->inp_gencnt <= gencnt &&
619 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
620 inp_list[i++] = inp;
621 INP_UNLOCK(inp);
622 }
623 INP_INFO_RUNLOCK(&divcbinfo);
624 n = i;
625
626 error = 0;
627 for (i = 0; i < n; i++) {
628 inp = inp_list[i];
629 INP_LOCK(inp);
630 if (inp->inp_gencnt <= gencnt) {
631 struct xinpcb xi;
632 bzero(&xi, sizeof(xi));
633 xi.xi_len = sizeof xi;
634 /* XXX should avoid extra copy */
635 bcopy(inp, &xi.xi_inp, sizeof *inp);
636 if (inp->inp_socket)
637 sotoxsocket(inp->inp_socket, &xi.xi_socket);
638 INP_UNLOCK(inp);
639 error = SYSCTL_OUT(req, &xi, sizeof xi);
640 } else
641 INP_UNLOCK(inp);
642 }
643 if (!error) {
644 /*
645 * Give the user an updated idea of our state.
646 * If the generation differs from what we told
647 * her before, she knows that something happened
648 * while we were processing this request, and it
649 * might be necessary to retry.
650 */
651 INP_INFO_RLOCK(&divcbinfo);
652 xig.xig_gen = divcbinfo.ipi_gencnt;
653 xig.xig_sogen = so_gencnt;
654 xig.xig_count = divcbinfo.ipi_count;
655 INP_INFO_RUNLOCK(&divcbinfo);
656 error = SYSCTL_OUT(req, &xig, sizeof xig);
657 }
658 free(inp_list, M_TEMP);
659 return error;
660}
661
662#ifdef SYSCTL_NODE
663SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT");
664SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0,
665 div_pcblist, "S,xinpcb", "List of active divert sockets");
666#endif
667
668struct pr_usrreqs div_usrreqs = {
669 .pru_attach = div_attach,
670 .pru_bind = div_bind,
671 .pru_control = in_control,
672 .pru_detach = div_detach,
673 .pru_peeraddr = in_getpeeraddr,
674 .pru_send = div_send,
675 .pru_shutdown = div_shutdown,
676 .pru_sockaddr = in_getsockaddr,
677 .pru_sosetlabel = in_pcbsosetlabel
678};
679
680struct protosw div_protosw = {
681 .pr_type = SOCK_RAW,
682 .pr_protocol = IPPROTO_DIVERT,
683 .pr_flags = PR_ATOMIC|PR_ADDR,
684 .pr_input = div_input,
685 .pr_ctlinput = div_ctlinput,
686 .pr_ctloutput = ip_ctloutput,
687 .pr_init = div_init,
688 .pr_usrreqs = &div_usrreqs
689};
690
691static int
692div_modevent(module_t mod, int type, void *unused)
693{
694 int err = 0;
695 int n;
696
697 switch (type) {
698 case MOD_LOAD:
699 /*
700 * Protocol will be initialized by pf_proto_register().
701 * We don't have to register ip_protox because we are not
702 * a true IP protocol that goes over the wire.
703 */
704 err = pf_proto_register(PF_INET, &div_protosw);
705 ip_divert_ptr = divert_packet;
706 break;
707 case MOD_QUIESCE:
708 /*
709 * IPDIVERT may normally not be unloaded because of the
710 * potential race conditions. Tell kldunload we can't be
711 * unloaded unless the unload is forced.
712 */
713 err = EPERM;
714 break;
715 case MOD_UNLOAD:
716 /*
717 * Forced unload.
718 *
719 * Module ipdivert can only be unloaded if no sockets are
720 * connected. Maybe this can be changed later to forcefully
721 * disconnect any open sockets.
722 *
723 * XXXRW: Note that there is a slight race here, as a new
724 * socket open request could be spinning on the lock and then
725 * we destroy the lock.
726 */
727 INP_INFO_WLOCK(&divcbinfo);
728 n = divcbinfo.ipi_count;
729 if (n != 0) {
730 err = EBUSY;
731 INP_INFO_WUNLOCK(&divcbinfo);
732 break;
733 }
734 ip_divert_ptr = NULL;
735 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW);
736 INP_INFO_WUNLOCK(&divcbinfo);
737 INP_INFO_LOCK_DESTROY(&divcbinfo);
738 uma_zdestroy(divcbinfo.ipi_zone);
739 break;
740 default:
741 err = EOPNOTSUPP;
742 break;
743 }
744 return err;
745}
746
747static moduledata_t ipdivertmod = {
748 "ipdivert",
749 div_modevent,
750 0
751};
752
753DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
754MODULE_DEPEND(dummynet, ipfw, 2, 2, 2);
755MODULE_VERSION(ipdivert, 1);
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