2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2006 The FreeBSD Project.
5 * Copyright (c) 2015 Andrey V. Elsukov <ae@FreeBSD.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "opt_inet6.h"
35 #include "opt_ipsec.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/hhook.h>
40 #include <sys/kernel.h>
41 #include <sys/malloc.h>
43 #include <sys/module.h>
44 #include <machine/bus.h>
46 #include <sys/socket.h>
47 #include <sys/sockio.h>
48 #include <sys/sysctl.h>
51 #include <net/if_enc.h>
52 #include <net/if_var.h>
53 #include <net/if_private.h>
54 #include <net/if_clone.h>
55 #include <net/if_types.h>
57 #include <net/route.h>
58 #include <net/netisr.h>
62 #include <netinet/in.h>
63 #include <netinet/in_systm.h>
64 #include <netinet/ip.h>
65 #include <netinet/ip_var.h>
66 #include <netinet/in_var.h>
69 #include <netinet/ip6.h>
70 #include <netinet6/ip6_var.h>
73 #include <netipsec/ipsec.h>
74 #include <netipsec/xform.h>
76 #define ENCMTU (1024+512)
78 /* XXX this define must have the same value as in OpenBSD */
79 #define M_CONF 0x0400 /* payload was encrypted (ESP-transport) */
80 #define M_AUTH 0x0800 /* payload was authenticated (AH or ESP auth) */
81 #define M_AUTH_AH 0x2000 /* header was authenticated (AH) */
91 VNET_DEFINE_STATIC(struct enc_softc *, enc_sc);
92 #define V_enc_sc VNET(enc_sc)
93 VNET_DEFINE_STATIC(struct if_clone *, enc_cloner);
94 #define V_enc_cloner VNET(enc_cloner)
96 static int enc_ioctl(struct ifnet *, u_long, caddr_t);
97 static int enc_output(struct ifnet *, struct mbuf *,
98 const struct sockaddr *, struct route *);
99 static int enc_clone_create(struct if_clone *, int, caddr_t);
100 static void enc_clone_destroy(struct ifnet *);
101 static int enc_add_hhooks(struct enc_softc *);
102 static void enc_remove_hhooks(struct enc_softc *);
104 static const char encname[] = "enc";
106 #define IPSEC_ENC_AFTER_PFIL 0x04
108 * Before and after are relative to when we are stripping the
111 * AFTER_PFIL flag used only for bpf_mask_*. It enables BPF capturing
112 * after PFIL hook execution. It might be useful when PFIL hook does
113 * some changes to the packet, e.g. address translation. If PFIL hook
114 * consumes mbuf, nothing will be captured.
116 VNET_DEFINE_STATIC(int, filter_mask_in) = IPSEC_ENC_BEFORE;
117 VNET_DEFINE_STATIC(int, bpf_mask_in) = IPSEC_ENC_BEFORE;
118 VNET_DEFINE_STATIC(int, filter_mask_out) = IPSEC_ENC_BEFORE;
119 VNET_DEFINE_STATIC(int, bpf_mask_out) = IPSEC_ENC_BEFORE | IPSEC_ENC_AFTER;
120 #define V_filter_mask_in VNET(filter_mask_in)
121 #define V_bpf_mask_in VNET(bpf_mask_in)
122 #define V_filter_mask_out VNET(filter_mask_out)
123 #define V_bpf_mask_out VNET(bpf_mask_out)
125 static SYSCTL_NODE(_net, OID_AUTO, enc, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
127 static SYSCTL_NODE(_net_enc, OID_AUTO, in, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
129 static SYSCTL_NODE(_net_enc, OID_AUTO, out, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
130 "enc output sysctl");
131 SYSCTL_INT(_net_enc_in, OID_AUTO, ipsec_filter_mask,
132 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(filter_mask_in), 0,
133 "IPsec input firewall filter mask");
134 SYSCTL_INT(_net_enc_in, OID_AUTO, ipsec_bpf_mask,
135 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(bpf_mask_in), 0,
136 "IPsec input bpf mask");
137 SYSCTL_INT(_net_enc_out, OID_AUTO, ipsec_filter_mask,
138 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(filter_mask_out), 0,
139 "IPsec output firewall filter mask");
140 SYSCTL_INT(_net_enc_out, OID_AUTO, ipsec_bpf_mask,
141 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(bpf_mask_out), 0,
142 "IPsec output bpf mask");
145 enc_clone_destroy(struct ifnet *ifp)
147 struct enc_softc *sc;
150 KASSERT(sc == V_enc_sc, ("sc != ifp->if_softc"));
160 enc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
163 struct enc_softc *sc;
165 sc = malloc(sizeof(struct enc_softc), M_DEVBUF,
167 ifp = sc->sc_ifp = if_alloc(IFT_ENC);
172 if (V_enc_sc != NULL) {
178 if_initname(ifp, encname, unit);
179 ifp->if_mtu = ENCMTU;
180 ifp->if_ioctl = enc_ioctl;
181 ifp->if_output = enc_output;
184 bpfattach(ifp, DLT_ENC, sizeof(struct enchdr));
189 enc_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
198 enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
201 if (cmd != SIOCSIFFLAGS)
203 if (ifp->if_flags & IFF_UP)
204 ifp->if_drv_flags |= IFF_DRV_RUNNING;
206 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
211 enc_bpftap(struct ifnet *ifp, struct mbuf *m, const struct secasvar *sav,
212 int32_t hhook_type, uint8_t enc, uint8_t af)
216 if (hhook_type == HHOOK_TYPE_IPSEC_IN &&
217 (enc & V_bpf_mask_in) == 0)
219 else if (hhook_type == HHOOK_TYPE_IPSEC_OUT &&
220 (enc & V_bpf_mask_out) == 0)
222 if (bpf_peers_present(ifp->if_bpf) == 0)
227 if (sav->alg_enc != SADB_EALG_NONE)
229 if (sav->alg_auth != SADB_AALG_NONE)
231 bpf_mtap2(ifp->if_bpf, &hdr, sizeof(hdr), m);
235 * One helper hook function is used by any hook points.
236 * + from hhook_type we can determine the packet direction:
237 * HHOOK_TYPE_IPSEC_IN or HHOOK_TYPE_IPSEC_OUT;
238 * + from hhook_id we can determine address family: AF_INET or AF_INET6;
239 * + udata contains pointer to enc_softc;
240 * + ctx_data contains pointer to struct ipsec_ctx_data.
243 enc_hhook(int32_t hhook_type, int32_t hhook_id, void *udata, void *ctx_data,
244 void *hdata, struct osd *hosd)
246 struct ipsec_ctx_data *ctx;
247 struct enc_softc *sc;
248 struct ifnet *ifp, *rcvif;
249 struct pfil_head *ph;
252 sc = (struct enc_softc *)udata;
254 if ((ifp->if_flags & IFF_UP) == 0)
257 ctx = (struct ipsec_ctx_data *)ctx_data;
258 /* XXX: wrong hook point was used by caller? */
259 if (ctx->af != hhook_id)
260 return (EPFNOSUPPORT);
262 enc_bpftap(ifp, *ctx->mp, ctx->sav, hhook_type, ctx->enc, ctx->af);
263 switch (hhook_type) {
264 case HHOOK_TYPE_IPSEC_IN:
265 if (ctx->enc == IPSEC_ENC_BEFORE) {
266 /* Do accounting only once */
267 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
268 if_inc_counter(ifp, IFCOUNTER_IBYTES,
269 (*ctx->mp)->m_pkthdr.len);
271 if ((ctx->enc & V_filter_mask_in) == 0)
272 return (0); /* skip pfil processing */
275 case HHOOK_TYPE_IPSEC_OUT:
276 if (ctx->enc == IPSEC_ENC_BEFORE) {
277 /* Do accounting only once */
278 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
279 if_inc_counter(ifp, IFCOUNTER_OBYTES,
280 (*ctx->mp)->m_pkthdr.len);
282 if ((ctx->enc & V_filter_mask_out) == 0)
283 return (0); /* skip pfil processing */
293 ph = V_inet_pfil_head;
298 ph = V_inet6_pfil_head;
304 if (ph == NULL || (pdir == PFIL_OUT && !PFIL_HOOKED_OUT(ph)) ||
305 (pdir == PFIL_IN && !PFIL_HOOKED_IN(ph)))
307 /* Make a packet looks like it was received on enc(4) */
308 rcvif = (*ctx->mp)->m_pkthdr.rcvif;
309 (*ctx->mp)->m_pkthdr.rcvif = ifp;
311 ret = pfil_mbuf_in(ph, ctx->mp, ifp, ctx->inp);
313 ret = pfil_mbuf_out(ph, ctx->mp, ifp, ctx->inp);
314 if (ret != PFIL_PASS) {
315 *ctx->mp = NULL; /* consumed by filter */
318 (*ctx->mp)->m_pkthdr.rcvif = rcvif;
319 enc_bpftap(ifp, *ctx->mp, ctx->sav, hhook_type,
320 IPSEC_ENC_AFTER_PFIL, ctx->af);
325 enc_add_hhooks(struct enc_softc *sc)
330 error = EPFNOSUPPORT;
331 hki.hook_func = enc_hhook;
332 hki.hook_helper = NULL;
335 hki.hook_id = AF_INET;
336 hki.hook_type = HHOOK_TYPE_IPSEC_IN;
337 error = hhook_add_hook(V_ipsec_hhh_in[HHOOK_IPSEC_INET],
341 hki.hook_type = HHOOK_TYPE_IPSEC_OUT;
342 error = hhook_add_hook(V_ipsec_hhh_out[HHOOK_IPSEC_INET],
348 hki.hook_id = AF_INET6;
349 hki.hook_type = HHOOK_TYPE_IPSEC_IN;
350 error = hhook_add_hook(V_ipsec_hhh_in[HHOOK_IPSEC_INET6],
354 hki.hook_type = HHOOK_TYPE_IPSEC_OUT;
355 error = hhook_add_hook(V_ipsec_hhh_out[HHOOK_IPSEC_INET6],
364 enc_remove_hhooks(struct enc_softc *sc)
368 hki.hook_func = enc_hhook;
369 hki.hook_helper = NULL;
372 hki.hook_id = AF_INET;
373 hki.hook_type = HHOOK_TYPE_IPSEC_IN;
374 hhook_remove_hook(V_ipsec_hhh_in[HHOOK_IPSEC_INET], &hki);
375 hki.hook_type = HHOOK_TYPE_IPSEC_OUT;
376 hhook_remove_hook(V_ipsec_hhh_out[HHOOK_IPSEC_INET], &hki);
379 hki.hook_id = AF_INET6;
380 hki.hook_type = HHOOK_TYPE_IPSEC_IN;
381 hhook_remove_hook(V_ipsec_hhh_in[HHOOK_IPSEC_INET6], &hki);
382 hki.hook_type = HHOOK_TYPE_IPSEC_OUT;
383 hhook_remove_hook(V_ipsec_hhh_out[HHOOK_IPSEC_INET6], &hki);
388 vnet_enc_init(const void *unused __unused)
392 V_enc_cloner = if_clone_simple(encname, enc_clone_create,
393 enc_clone_destroy, 1);
395 VNET_SYSINIT(vnet_enc_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
396 vnet_enc_init, NULL);
399 vnet_enc_init_proto(void *unused __unused)
401 KASSERT(V_enc_sc != NULL, ("%s: V_enc_sc is %p\n", __func__, V_enc_sc));
403 if (enc_add_hhooks(V_enc_sc) != 0)
404 enc_clone_destroy(V_enc_sc->sc_ifp);
406 VNET_SYSINIT(vnet_enc_init_proto, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
407 vnet_enc_init_proto, NULL);
410 vnet_enc_uninit(const void *unused __unused)
412 KASSERT(V_enc_sc != NULL, ("%s: V_enc_sc is %p\n", __func__, V_enc_sc));
414 if_clone_detach(V_enc_cloner);
416 VNET_SYSUNINIT(vnet_enc_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
417 vnet_enc_uninit, NULL);
420 * The hhook consumer needs to go before ip[6]_destroy are called on
424 vnet_enc_uninit_hhook(const void *unused __unused)
426 KASSERT(V_enc_sc != NULL, ("%s: V_enc_sc is %p\n", __func__, V_enc_sc));
428 enc_remove_hhooks(V_enc_sc);
430 VNET_SYSUNINIT(vnet_enc_uninit_hhook, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
431 vnet_enc_uninit_hhook, NULL);
434 enc_modevent(module_t mod, int type, void *data)
447 static moduledata_t enc_mod = {
453 DECLARE_MODULE(if_enc, enc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
454 MODULE_VERSION(if_enc, 1);