2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2021-2022 Rubicon Communications, LLC (Netgate)
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include "opt_inet6.h"
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/buf_ring.h>
34 #include <sys/epoch.h>
36 #include <sys/filedesc.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
40 #include <sys/module.h>
43 #include <sys/protosw.h>
44 #include <sys/rmlock.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/sockio.h>
50 #include <sys/sysctl.h>
53 #include <machine/atomic.h>
57 #include <net/if_clone.h>
58 #include <net/if_types.h>
59 #include <net/if_var.h>
60 #include <net/if_private.h>
61 #include <net/netisr.h>
62 #include <net/route/nhop.h>
64 #include <netinet/in.h>
65 #include <netinet/in_fib.h>
66 #include <netinet/ip.h>
67 #include <netinet/ip6.h>
68 #include <netinet/ip_var.h>
69 #include <netinet/udp.h>
70 #include <netinet/udp_var.h>
72 #include <netinet6/ip6_var.h>
73 #include <netinet6/in6_fib.h>
75 #include <machine/in_cksum.h>
77 #include <opencrypto/cryptodev.h>
81 struct ovpn_kkey_dir {
87 enum ovpn_key_cipher cipher;
88 crypto_session_t cryptoid;
90 struct mtx replay_mtx;
92 * Last seen gapless sequence number. New rx seq numbers must be
93 * strictly higher than this.
98 /* Seen packets, relative to rx_seq. bit(0) will always be 0. */
103 struct ovpn_kkey_dir *encrypt;
104 struct ovpn_kkey_dir *decrypt;
109 struct ovpn_keepalive {
114 struct ovpn_wire_header {
115 uint32_t opcode; /* opcode, key id, peer id */
117 uint8_t auth_tag[16];
120 struct ovpn_peer_counters {
126 #define OVPN_PEER_COUNTER_SIZE (sizeof(struct ovpn_peer_counters)/sizeof(uint64_t))
128 struct ovpn_notification {
129 enum ovpn_notif_type type;
132 /* Delete notification */
133 enum ovpn_del_reason del_reason;
134 struct ovpn_peer_counters counters;
140 RB_ENTRY(ovpn_kpeer) tree;
144 struct ovpn_softc *sc;
145 struct sockaddr_storage local;
146 struct sockaddr_storage remote;
149 struct in6_addr vpn6;
151 struct ovpn_kkey keys[2];
153 enum ovpn_del_reason del_reason;
154 struct ovpn_keepalive keepalive;
155 uint32_t *last_active;
156 struct callout ping_send;
157 struct callout ping_rcv;
159 counter_u64_t counters[OVPN_PEER_COUNTER_SIZE];
162 struct ovpn_counters {
163 uint64_t lost_ctrl_pkts_in;
164 uint64_t lost_ctrl_pkts_out;
165 uint64_t lost_data_pkts_in;
166 uint64_t lost_data_pkts_out;
167 uint64_t nomem_data_pkts_in;
168 uint64_t nomem_data_pkts_out;
169 uint64_t received_ctrl_pkts;
170 uint64_t received_data_pkts;
171 uint64_t sent_ctrl_pkts;
172 uint64_t sent_data_pkts;
174 uint64_t transport_bytes_sent;
175 uint64_t transport_bytes_received;
176 uint64_t tunnel_bytes_sent;
177 uint64_t tunnel_bytes_received;
179 #define OVPN_COUNTER_SIZE (sizeof(struct ovpn_counters)/sizeof(uint64_t))
181 RB_HEAD(ovpn_kpeers, ovpn_kpeer);
189 struct ovpn_kpeers peers;
191 /* Pending notification */
192 struct buf_ring *notifring;
194 counter_u64_t counters[OVPN_COUNTER_SIZE];
196 struct epoch_context epoch_ctx;
199 static struct ovpn_kpeer *ovpn_find_peer(struct ovpn_softc *, uint32_t);
200 static bool ovpn_udp_input(struct mbuf *, int, struct inpcb *,
201 const struct sockaddr *, void *);
202 static int ovpn_transmit_to_peer(struct ifnet *, struct mbuf *,
203 struct ovpn_kpeer *, struct rm_priotracker *);
204 static int ovpn_encap(struct ovpn_softc *, uint32_t, struct mbuf *);
205 static int ovpn_get_af(struct mbuf *);
206 static void ovpn_free_kkey_dir(struct ovpn_kkey_dir *);
207 static bool ovpn_check_replay(struct ovpn_kkey_dir *, uint32_t);
208 static int ovpn_peer_compare(struct ovpn_kpeer *, struct ovpn_kpeer *);
210 static RB_PROTOTYPE(ovpn_kpeers, ovpn_kpeer, tree, ovpn_peer_compare);
211 static RB_GENERATE(ovpn_kpeers, ovpn_kpeer, tree, ovpn_peer_compare);
213 #define OVPN_MTU_MIN 576
214 #define OVPN_MTU_MAX (IP_MAXPACKET - sizeof(struct ip) - \
215 sizeof(struct udphdr) - sizeof(struct ovpn_wire_header))
217 #define OVPN_OP_DATA_V2 0x09
218 #define OVPN_OP_SHIFT 3
219 #define OVPN_SEQ_ROTATE 0x80000000
221 VNET_DEFINE_STATIC(struct if_clone *, ovpn_cloner);
222 #define V_ovpn_cloner VNET(ovpn_cloner)
224 #define OVPN_RLOCK_TRACKER struct rm_priotracker _ovpn_lock_tracker; \
225 struct rm_priotracker *_ovpn_lock_trackerp = &_ovpn_lock_tracker
226 #define OVPN_RLOCK(sc) rm_rlock(&(sc)->lock, _ovpn_lock_trackerp)
227 #define OVPN_RUNLOCK(sc) rm_runlock(&(sc)->lock, _ovpn_lock_trackerp)
228 #define OVPN_WLOCK(sc) rm_wlock(&(sc)->lock)
229 #define OVPN_WUNLOCK(sc) rm_wunlock(&(sc)->lock)
230 #define OVPN_ASSERT(sc) rm_assert(&(sc)->lock, RA_LOCKED)
231 #define OVPN_RASSERT(sc) rm_assert(&(sc)->lock, RA_RLOCKED)
232 #define OVPN_WASSERT(sc) rm_assert(&(sc)->lock, RA_WLOCKED)
233 #define OVPN_UNLOCK_ASSERT(sc) rm_assert(&(sc)->lock, RA_UNLOCKED)
235 #define OVPN_COUNTER(sc, name) \
236 ((sc)->counters[offsetof(struct ovpn_counters, name)/sizeof(uint64_t)])
237 #define OVPN_PEER_COUNTER(peer, name) \
238 ((peer)->counters[offsetof(struct ovpn_peer_counters, name) / \
241 #define OVPN_COUNTER_ADD(sc, name, val) \
242 counter_u64_add(OVPN_COUNTER(sc, name), val)
243 #define OVPN_PEER_COUNTER_ADD(p, name, val) \
244 counter_u64_add(OVPN_PEER_COUNTER(p, name), val)
246 #define TO_IN(x) ((struct sockaddr_in *)(x))
247 #define TO_IN6(x) ((struct sockaddr_in6 *)(x))
249 SDT_PROVIDER_DEFINE(if_ovpn);
250 SDT_PROBE_DEFINE1(if_ovpn, tx, transmit, start, "struct mbuf *");
251 SDT_PROBE_DEFINE2(if_ovpn, tx, route, ip4, "struct in_addr *", "struct ovpn_kpeer *");
252 SDT_PROBE_DEFINE2(if_ovpn, tx, route, ip6, "struct in6_addr *", "struct ovpn_kpeer *");
254 static const char ovpnname[] = "ovpn";
255 static const char ovpngroupname[] = "openvpn";
257 static MALLOC_DEFINE(M_OVPN, ovpnname, "OpenVPN DCO Interface");
259 SYSCTL_DECL(_net_link);
260 static SYSCTL_NODE(_net_link, IFT_OTHER, openvpn, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
261 "OpenVPN DCO Interface");
262 VNET_DEFINE_STATIC(int, replay_protection) = 0;
263 #define V_replay_protection VNET(replay_protection)
264 SYSCTL_INT(_net_link_openvpn, OID_AUTO, replay_protection, CTLFLAG_VNET | CTLFLAG_RW,
265 &VNET_NAME(replay_protection), 0, "Validate sequence numbers");
267 VNET_DEFINE_STATIC(int, async_crypto);
268 #define V_async_crypto VNET(async_crypto)
269 SYSCTL_INT(_net_link_openvpn, OID_AUTO, async_crypto,
270 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(async_crypto), 0,
271 "Use asynchronous mode to parallelize crypto jobs.");
273 VNET_DEFINE_STATIC(int, async_netisr_queue);
274 #define V_async_netisr_queue VNET(async_netisr_queue)
275 SYSCTL_INT(_net_link_openvpn, OID_AUTO, netisr_queue,
276 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(async_netisr_queue), 0,
277 "Use netisr_queue() rather than netisr_dispatch().");
280 ovpn_peer_compare(struct ovpn_kpeer *a, struct ovpn_kpeer *b)
282 return (a->peerid - b->peerid);
285 static struct ovpn_kpeer *
286 ovpn_find_peer(struct ovpn_softc *sc, uint32_t peerid)
294 return (RB_FIND(ovpn_kpeers, &sc->peers, &p));
297 static struct ovpn_kpeer *
298 ovpn_find_only_peer(struct ovpn_softc *sc)
302 return (RB_ROOT(&sc->peers));
306 ovpn_get_port(struct sockaddr_storage *s)
308 switch (s->ss_family) {
310 struct sockaddr_in *in = (struct sockaddr_in *)s;
311 return (in->sin_port);
314 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)s;
315 return (in6->sin6_port);
318 panic("Unsupported address family %d", s->ss_family);
323 ovpn_nvlist_to_sockaddr(const nvlist_t *nvl, struct sockaddr_storage *sa)
327 if (! nvlist_exists_number(nvl, "af"))
329 if (! nvlist_exists_binary(nvl, "address"))
331 if (! nvlist_exists_number(nvl, "port"))
334 af = nvlist_get_number(nvl, "af");
339 struct sockaddr_in *in = (struct sockaddr_in *)sa;
341 const void *addr = nvlist_get_binary(nvl, "address", &len);
343 if (len != sizeof(in->sin_addr))
346 memcpy(&in->sin_addr, addr, sizeof(in->sin_addr));
347 in->sin_port = nvlist_get_number(nvl, "port");
353 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
355 const void *addr = nvlist_get_binary(nvl, "address", &len);
356 in6->sin6_family = af;
357 if (len != sizeof(in6->sin6_addr))
360 memcpy(&in6->sin6_addr, addr, sizeof(in6->sin6_addr));
361 in6->sin6_port = nvlist_get_number(nvl, "port");
373 ovpn_has_peers(struct ovpn_softc *sc)
377 return (sc->peercount > 0);
381 ovpn_rele_so(struct ovpn_softc *sc, struct ovpn_kpeer *peer)
390 has_peers = ovpn_has_peers(sc);
392 /* Only remove the tunnel function if we're releasing the socket for
395 (void)udp_set_kernel_tunneling(sc->so, NULL, NULL, NULL);
404 ovpn_notify_del_peer(struct ovpn_softc *sc, struct ovpn_kpeer *peer)
406 struct ovpn_notification *n;
410 n = malloc(sizeof(*n), M_OVPN, M_NOWAIT);
414 n->peerid = peer->peerid;
415 n->type = OVPN_NOTIF_DEL_PEER;
416 n->del_reason = peer->del_reason;
418 n->counters.pkt_in = counter_u64_fetch(OVPN_PEER_COUNTER(peer, pkt_in));
419 n->counters.pkt_out = counter_u64_fetch(OVPN_PEER_COUNTER(peer, pkt_out));
420 n->counters.bytes_in = counter_u64_fetch(OVPN_PEER_COUNTER(peer, bytes_in));
421 n->counters.bytes_out = counter_u64_fetch(OVPN_PEER_COUNTER(peer, bytes_out));
423 if (buf_ring_enqueue(sc->notifring, n) != 0) {
425 } else if (sc->so != NULL) {
426 /* Wake up userspace */
427 sc->so->so_error = EAGAIN;
434 ovpn_notify_key_rotation(struct ovpn_softc *sc, struct ovpn_kpeer *peer)
436 struct ovpn_notification *n;
438 n = malloc(sizeof(*n), M_OVPN, M_NOWAIT | M_ZERO);
442 n->peerid = peer->peerid;
443 n->type = OVPN_NOTIF_ROTATE_KEY;
445 if (buf_ring_enqueue(sc->notifring, n) != 0) {
447 } else if (sc->so != NULL) {
448 /* Wake up userspace */
449 sc->so->so_error = EAGAIN;
456 ovpn_peer_release_ref(struct ovpn_kpeer *peer, bool locked)
458 struct ovpn_softc *sc;
460 CURVNET_ASSERT_SET();
462 atomic_add_int(&peer->refcount, -1);
464 if (atomic_load_int(&peer->refcount) > 0)
472 /* Might have changed before we acquired the lock. */
473 if (atomic_load_int(&peer->refcount) > 0) {
481 /* The peer should have been removed from the list already. */
482 MPASS(ovpn_find_peer(sc, peer->peerid) == NULL);
484 ovpn_notify_del_peer(sc, peer);
486 for (int i = 0; i < 2; i++) {
487 ovpn_free_kkey_dir(peer->keys[i].encrypt);
488 ovpn_free_kkey_dir(peer->keys[i].decrypt);
491 ovpn_rele_so(sc, peer);
493 callout_stop(&peer->ping_send);
494 callout_stop(&peer->ping_rcv);
495 uma_zfree_pcpu(pcpu_zone_4, peer->last_active);
503 ovpn_new_peer(struct ifnet *ifp, const nvlist_t *nvl)
506 struct epoch_tracker et;
508 struct sockaddr_storage remote;
509 struct ovpn_kpeer *peer = NULL;
510 struct file *fp = NULL;
511 struct ovpn_softc *sc = ifp->if_softc;
512 struct thread *td = curthread;
513 struct socket *so = NULL;
521 if (! nvlist_exists_number(nvl, "peerid"))
524 if (! nvlist_exists_number(nvl, "fd"))
527 if (! nvlist_exists_nvlist(nvl, "remote"))
530 peerid = nvlist_get_number(nvl, "peerid");
532 ret = ovpn_nvlist_to_sockaddr(nvlist_get_nvlist(nvl, "remote"),
537 fd = nvlist_get_number(nvl, "fd");
539 /* Look up the userspace process and use the fd to find the socket. */
540 ret = getsock(td, fd, &cap_connect_rights, &fp);
546 peer = malloc(sizeof(*peer), M_OVPN, M_WAITOK | M_ZERO);
547 peer->peerid = peerid;
550 peer->last_active = uma_zalloc_pcpu(pcpu_zone_4, M_WAITOK | M_ZERO);
551 COUNTER_ARRAY_ALLOC(peer->counters, OVPN_PEER_COUNTER_SIZE, M_WAITOK);
553 if (nvlist_exists_binary(nvl, "vpn_ipv4")) {
555 const void *addr = nvlist_get_binary(nvl, "vpn_ipv4", &len);
556 if (len != sizeof(peer->vpn4)) {
560 memcpy(&peer->vpn4, addr, len);
563 if (nvlist_exists_binary(nvl, "vpn_ipv6")) {
565 const void *addr = nvlist_get_binary(nvl, "vpn_ipv6", &len);
566 if (len != sizeof(peer->vpn6)) {
570 memcpy(&peer->vpn6, addr, len);
573 callout_init_rm(&peer->ping_send, &sc->lock, CALLOUT_SHAREDLOCK);
574 callout_init_rm(&peer->ping_rcv, &sc->lock, 0);
576 peer->local.ss_len = sizeof(peer->local);
577 ret = sosockaddr(so, (struct sockaddr *)&peer->local);
581 if (ovpn_get_port(&peer->local) == 0) {
585 if (peer->local.ss_family != remote.ss_family) {
590 memcpy(&peer->remote, &remote, sizeof(remote));
592 if (peer->local.ss_family == AF_INET6 &&
593 IN6_IS_ADDR_V4MAPPED(&TO_IN6(&peer->remote)->sin6_addr)) {
594 /* V4 mapped address, so treat this as v4, not v6. */
595 in6_sin6_2_sin_in_sock((struct sockaddr *)&peer->local);
596 in6_sin6_2_sin_in_sock((struct sockaddr *)&peer->remote);
600 if (peer->local.ss_family == AF_INET6 &&
601 IN6_IS_ADDR_UNSPECIFIED(&TO_IN6(&peer->local)->sin6_addr)) {
603 ret = in6_selectsrc_addr(curthread->td_proc->p_fibnum,
604 &TO_IN6(&peer->remote)->sin6_addr,
605 0, NULL, &TO_IN6(&peer->local)->sin6_addr, NULL);
614 /* Disallow peer id re-use. */
615 if (ovpn_find_peer(sc, peerid) != NULL) {
620 /* Make sure this is really a UDP socket. */
621 if (so->so_type != SOCK_DGRAM || so->so_proto->pr_type != SOCK_DGRAM) {
626 /* Must be the same socket as for other peers on this interface. */
627 if (sc->so != NULL && so != sc->so)
633 /* Insert the peer into the list. */
634 RB_INSERT(ovpn_kpeers, &sc->peers, peer);
638 ret = udp_set_kernel_tunneling(sc->so, ovpn_udp_input, NULL, sc);
640 /* Fine, another peer already set the input function. */
644 RB_REMOVE(ovpn_kpeers, &sc->peers, peer);
656 COUNTER_ARRAY_FREE(peer->counters, OVPN_PEER_COUNTER_SIZE);
657 uma_zfree_pcpu(pcpu_zone_4, peer->last_active);
667 _ovpn_del_peer(struct ovpn_softc *sc, struct ovpn_kpeer *peer)
669 struct ovpn_kpeer *tmp __diagused;
672 CURVNET_ASSERT_SET();
674 MPASS(RB_FIND(ovpn_kpeers, &sc->peers, peer) == peer);
676 tmp = RB_REMOVE(ovpn_kpeers, &sc->peers, peer);
681 ovpn_peer_release_ref(peer, true);
687 ovpn_del_peer(struct ifnet *ifp, nvlist_t *nvl)
689 struct ovpn_softc *sc = ifp->if_softc;
690 struct ovpn_kpeer *peer;
699 if (! nvlist_exists_number(nvl, "peerid"))
702 peerid = nvlist_get_number(nvl, "peerid");
704 peer = ovpn_find_peer(sc, peerid);
708 peer->del_reason = OVPN_DEL_REASON_REQUESTED;
709 ret = _ovpn_del_peer(sc, peer);
715 ovpn_create_kkey_dir(struct ovpn_kkey_dir **kdirp,
718 struct crypto_session_params csp;
719 struct ovpn_kkey_dir *kdir;
720 const char *ciphername;
721 enum ovpn_key_cipher cipher;
722 const void *key, *iv;
723 size_t keylen = 0, ivlen = 0;
726 if (! nvlist_exists_string(nvl, "cipher"))
728 ciphername = nvlist_get_string(nvl, "cipher");
730 if (strcmp(ciphername, "none") == 0)
731 cipher = OVPN_CIPHER_ALG_NONE;
732 else if (strcmp(ciphername, "AES-256-GCM") == 0 ||
733 strcmp(ciphername, "AES-192-GCM") == 0 ||
734 strcmp(ciphername, "AES-128-GCM") == 0)
735 cipher = OVPN_CIPHER_ALG_AES_GCM;
736 else if (strcmp(ciphername, "CHACHA20-POLY1305") == 0)
737 cipher = OVPN_CIPHER_ALG_CHACHA20_POLY1305;
741 if (cipher != OVPN_CIPHER_ALG_NONE) {
742 if (! nvlist_exists_binary(nvl, "key"))
744 key = nvlist_get_binary(nvl, "key", &keylen);
745 if (keylen > sizeof(kdir->key))
748 if (! nvlist_exists_binary(nvl, "iv"))
750 iv = nvlist_get_binary(nvl, "iv", &ivlen);
755 kdir = malloc(sizeof(struct ovpn_kkey_dir), M_OVPN,
758 kdir->cipher = cipher;
759 kdir->keylen = keylen;
761 memcpy(kdir->key, key, keylen);
762 kdir->noncelen = ivlen;
763 memcpy(kdir->nonce, iv, ivlen);
765 if (kdir->cipher != OVPN_CIPHER_ALG_NONE) {
767 bzero(&csp, sizeof(csp));
768 csp.csp_mode = CSP_MODE_AEAD;
770 if (kdir->cipher == OVPN_CIPHER_ALG_CHACHA20_POLY1305)
771 csp.csp_cipher_alg = CRYPTO_CHACHA20_POLY1305;
773 csp.csp_cipher_alg = CRYPTO_AES_NIST_GCM_16;
775 csp.csp_flags |= CSP_F_SEPARATE_AAD;
777 csp.csp_cipher_klen = kdir->keylen;
778 csp.csp_cipher_key = kdir->key;
779 csp.csp_ivlen = 96 / 8;
781 error = crypto_newsession(&kdir->cryptoid, &csp,
782 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE);
789 mtx_init(&kdir->replay_mtx, "if_ovpn rx replay", NULL, MTX_DEF);
796 ovpn_free_kkey_dir(struct ovpn_kkey_dir *kdir)
801 mtx_destroy(&kdir->replay_mtx);
803 crypto_freesession(kdir->cryptoid);
808 ovpn_set_key(struct ifnet *ifp, const nvlist_t *nvl)
810 struct ovpn_softc *sc = ifp->if_softc;
811 struct ovpn_kkey_dir *enc, *dec;
812 struct ovpn_kpeer *peer;
813 int slot, keyid, peerid;
819 if (! nvlist_exists_number(nvl, "slot"))
821 slot = nvlist_get_number(nvl, "slot");
823 if (! nvlist_exists_number(nvl, "keyid"))
825 keyid = nvlist_get_number(nvl, "keyid");
827 if (! nvlist_exists_number(nvl, "peerid"))
829 peerid = nvlist_get_number(nvl, "peerid");
831 if (slot != OVPN_KEY_SLOT_PRIMARY &&
832 slot != OVPN_KEY_SLOT_SECONDARY)
835 if (! nvlist_exists_nvlist(nvl, "encrypt") ||
836 ! nvlist_exists_nvlist(nvl, "decrypt"))
839 error = ovpn_create_kkey_dir(&enc, nvlist_get_nvlist(nvl, "encrypt"));
843 error = ovpn_create_kkey_dir(&dec, nvlist_get_nvlist(nvl, "decrypt"));
845 ovpn_free_kkey_dir(enc);
851 peer = ovpn_find_peer(sc, peerid);
853 ovpn_free_kkey_dir(dec);
854 ovpn_free_kkey_dir(enc);
859 ovpn_free_kkey_dir(peer->keys[slot].encrypt);
860 ovpn_free_kkey_dir(peer->keys[slot].decrypt);
862 peer->keys[slot].encrypt = enc;
863 peer->keys[slot].decrypt = dec;
865 peer->keys[slot].keyid = keyid;
866 peer->keys[slot].peerid = peerid;
874 ovpn_check_key(struct ovpn_softc *sc, struct ovpn_kpeer *peer, enum ovpn_key_slot slot)
878 if (peer->keys[slot].encrypt == NULL)
881 if (peer->keys[slot].decrypt == NULL)
888 ovpn_start(struct ifnet *ifp)
890 struct ovpn_softc *sc = ifp->if_softc;
894 ifp->if_flags |= IFF_UP;
895 ifp->if_drv_flags |= IFF_DRV_RUNNING;
896 if_link_state_change(ifp, LINK_STATE_UP);
904 ovpn_swap_keys(struct ifnet *ifp, nvlist_t *nvl)
906 struct ovpn_softc *sc = ifp->if_softc;
907 struct ovpn_kpeer *peer;
908 struct ovpn_kkey tmpkey;
914 if (! nvlist_exists_number(nvl, "peerid"))
919 peer = ovpn_find_peer(sc, nvlist_get_number(nvl, "peerid"));
925 /* Check that we have a second key to swap to. */
926 error = ovpn_check_key(sc, peer, OVPN_KEY_SLOT_SECONDARY);
932 tmpkey = peer->keys[0];
933 peer->keys[0] = peer->keys[1];
934 peer->keys[1] = tmpkey;
942 ovpn_del_key(struct ifnet *ifp, const nvlist_t *nvl)
944 enum ovpn_key_slot slot;
945 struct ovpn_kpeer *peer;
946 struct ovpn_softc *sc = ifp->if_softc;
951 if (! nvlist_exists_number(nvl, "peerid"))
954 if (! nvlist_exists_number(nvl, "slot"))
956 slot = nvlist_get_number(nvl, "slot");
958 if (slot != OVPN_KEY_SLOT_PRIMARY &&
959 slot != OVPN_KEY_SLOT_SECONDARY)
964 peer = ovpn_find_peer(sc, nvlist_get_number(nvl, "peerid"));
970 ovpn_free_kkey_dir(peer->keys[slot].encrypt);
971 ovpn_free_kkey_dir(peer->keys[slot].decrypt);
973 peer->keys[slot].encrypt = NULL;
974 peer->keys[slot].decrypt = NULL;
976 peer->keys[slot].keyid = 0;
977 peer->keys[slot].peerid = 0;
985 ovpn_send_ping(void *arg)
987 static const uint8_t ping_str[] = {
988 0x2a, 0x18, 0x7b, 0xf3, 0x64, 0x1e, 0xb4, 0xcb,
989 0x07, 0xed, 0x2d, 0x0a, 0x98, 0x1f, 0xc7, 0x48
992 struct epoch_tracker et;
993 struct ovpn_kpeer *peer = arg;
994 struct ovpn_softc *sc = peer->sc;
999 /* Ensure we repeat! */
1000 callout_reset(&peer->ping_send, peer->keepalive.interval * hz,
1001 ovpn_send_ping, peer);
1003 m = m_get2(sizeof(ping_str), M_NOWAIT, MT_DATA, M_PKTHDR);
1007 m_copyback(m, 0, sizeof(ping_str), ping_str);
1008 m->m_len = m->m_pkthdr.len = sizeof(ping_str);
1010 CURVNET_SET(sc->ifp->if_vnet);
1011 NET_EPOCH_ENTER(et);
1012 (void)ovpn_transmit_to_peer(sc->ifp, m, peer, NULL);
1018 ovpn_timeout(void *arg)
1020 struct ovpn_kpeer *peer = arg;
1021 struct ovpn_softc *sc = peer->sc;
1022 uint32_t last, _last_active;
1030 _last_active = *zpcpu_get_cpu(peer->last_active, cpu);
1031 if (_last_active > last)
1032 last = _last_active;
1035 if (last + peer->keepalive.timeout > time_uptime) {
1036 callout_reset(&peer->ping_rcv,
1037 (peer->keepalive.timeout - (time_uptime - last)) * hz,
1038 ovpn_timeout, peer);
1042 CURVNET_SET(sc->ifp->if_vnet);
1043 peer->del_reason = OVPN_DEL_REASON_TIMEOUT;
1044 ret = _ovpn_del_peer(sc, peer);
1050 ovpn_set_peer(struct ifnet *ifp, const nvlist_t *nvl)
1052 struct ovpn_softc *sc = ifp->if_softc;
1053 struct ovpn_kpeer *peer;
1058 if (! nvlist_exists_number(nvl, "interval") ||
1059 ! nvlist_exists_number(nvl, "timeout") ||
1060 ! nvlist_exists_number(nvl, "peerid"))
1065 peer = ovpn_find_peer(sc, nvlist_get_number(nvl, "peerid"));
1071 peer->keepalive.interval = nvlist_get_number(nvl, "interval");
1072 peer->keepalive.timeout = nvlist_get_number(nvl, "timeout");
1074 if (peer->keepalive.interval > 0)
1075 callout_reset(&peer->ping_send, peer->keepalive.interval * hz,
1076 ovpn_send_ping, peer);
1077 if (peer->keepalive.timeout > 0)
1078 callout_reset(&peer->ping_rcv, peer->keepalive.timeout * hz,
1079 ovpn_timeout, peer);
1087 ovpn_set_ifmode(struct ifnet *ifp, const nvlist_t *nvl)
1089 struct ovpn_softc *sc = ifp->if_softc;
1095 if (! nvlist_exists_number(nvl, "ifmode") )
1098 ifmode = nvlist_get_number(nvl, "ifmode");
1102 /* deny this if UP */
1103 if (ifp->if_flags & IFF_UP) {
1108 switch (ifmode & ~IFF_MULTICAST) {
1109 case IFF_POINTOPOINT:
1112 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST);
1113 ifp->if_flags |= ifmode;
1126 ovpn_ioctl_set(struct ifnet *ifp, struct ifdrv *ifd)
1128 struct ovpn_softc *sc = ifp->if_softc;
1129 uint8_t *buf = NULL;
1130 nvlist_t *nvl = NULL;
1133 if (ifd->ifd_len != 0) {
1134 if (ifd->ifd_len > OVPN_MAX_REQUEST_SIZE)
1137 buf = malloc(ifd->ifd_len, M_OVPN, M_WAITOK);
1139 ret = copyin(ifd->ifd_data, buf, ifd->ifd_len);
1145 nvl = nvlist_unpack(buf, ifd->ifd_len, 0);
1152 switch (ifd->ifd_cmd) {
1154 ret = ovpn_new_peer(ifp, nvl);
1158 ret = ovpn_del_peer(ifp, nvl);
1162 ret = ovpn_set_key(ifp, nvl);
1164 case OVPN_START_VPN:
1165 ret = ovpn_start(ifp);
1167 case OVPN_SWAP_KEYS:
1168 ret = ovpn_swap_keys(ifp, nvl);
1171 ret = ovpn_del_key(ifp, nvl);
1174 ret = ovpn_set_peer(ifp, nvl);
1176 case OVPN_SET_IFMODE:
1177 ret = ovpn_set_ifmode(ifp, nvl);
1183 nvlist_destroy(nvl);
1188 ovpn_add_counters(nvlist_t *parent, const char *name, counter_u64_t in,
1193 nvl = nvlist_create(0);
1197 nvlist_add_number(nvl, "in", counter_u64_fetch(in));
1198 nvlist_add_number(nvl, "out", counter_u64_fetch(out));
1200 nvlist_add_nvlist(parent, name, nvl);
1202 nvlist_destroy(nvl);
1208 ovpn_get_stats(struct ovpn_softc *sc, nvlist_t **onvl)
1213 nvl = nvlist_create(0);
1217 #define OVPN_COUNTER_OUT(name, in, out) \
1219 ret = ovpn_add_counters(nvl, name, OVPN_COUNTER(sc, in), \
1220 OVPN_COUNTER(sc, out)); \
1225 OVPN_COUNTER_OUT("lost_ctrl", lost_ctrl_pkts_in, lost_ctrl_pkts_out);
1226 OVPN_COUNTER_OUT("lost_data", lost_data_pkts_in, lost_data_pkts_out);
1227 OVPN_COUNTER_OUT("nomem_data", nomem_data_pkts_in,
1228 nomem_data_pkts_out);
1229 OVPN_COUNTER_OUT("data", received_data_pkts, sent_data_pkts);
1230 OVPN_COUNTER_OUT("ctrl", received_ctrl_pkts, sent_ctrl_pkts);
1231 OVPN_COUNTER_OUT("tunnel", tunnel_bytes_received,
1232 tunnel_bytes_received);
1233 OVPN_COUNTER_OUT("transport", transport_bytes_received,
1234 transport_bytes_received);
1235 #undef OVPN_COUNTER_OUT
1242 nvlist_destroy(nvl);
1247 ovpn_get_peer_stats(struct ovpn_softc *sc, nvlist_t **nvl)
1249 struct ovpn_kpeer *peer;
1250 nvlist_t *nvpeer = NULL;
1255 *nvl = nvlist_create(0);
1259 #define OVPN_PEER_COUNTER_OUT(name, in, out) \
1261 ret = ovpn_add_counters(nvpeer, name, \
1262 OVPN_PEER_COUNTER(peer, in), OVPN_PEER_COUNTER(peer, out)); \
1268 RB_FOREACH(peer, ovpn_kpeers, &sc->peers) {
1269 nvpeer = nvlist_create(0);
1270 if (nvpeer == NULL) {
1272 nvlist_destroy(*nvl);
1277 nvlist_add_number(nvpeer, "peerid", peer->peerid);
1279 OVPN_PEER_COUNTER_OUT("packets", pkt_in, pkt_out);
1280 OVPN_PEER_COUNTER_OUT("bytes", bytes_in, bytes_out);
1282 nvlist_append_nvlist_array(*nvl, "peers", nvpeer);
1283 nvlist_destroy(nvpeer);
1285 #undef OVPN_PEER_COUNTER_OUT
1291 nvlist_destroy(nvpeer);
1292 nvlist_destroy(*nvl);
1298 ovpn_poll_pkt(struct ovpn_softc *sc, nvlist_t **onvl)
1302 nvl = nvlist_create(0);
1306 nvlist_add_number(nvl, "pending", buf_ring_count(sc->notifring));
1314 ovpn_notif_add_counters(nvlist_t *parent, struct ovpn_notification *n)
1318 nvl = nvlist_create(0);
1322 nvlist_add_number(nvl, "in", n->counters.pkt_in);
1323 nvlist_add_number(nvl, "out", n->counters.pkt_out);
1325 nvlist_add_nvlist(parent, "packets", nvl);
1326 nvlist_destroy(nvl);
1328 nvl = nvlist_create(0);
1332 nvlist_add_number(nvl, "in", n->counters.bytes_in);
1333 nvlist_add_number(nvl, "out", n->counters.bytes_out);
1335 nvlist_add_nvlist(parent, "bytes", nvl);
1336 nvlist_destroy(nvl);
1340 opvn_get_pkt(struct ovpn_softc *sc, nvlist_t **onvl)
1342 struct ovpn_notification *n;
1345 /* Check if we have notifications pending. */
1346 n = buf_ring_dequeue_mc(sc->notifring);
1350 nvl = nvlist_create(0);
1355 nvlist_add_number(nvl, "peerid", n->peerid);
1356 nvlist_add_number(nvl, "notification", n->type);
1357 if (n->type == OVPN_NOTIF_DEL_PEER) {
1358 nvlist_add_number(nvl, "del_reason", n->del_reason);
1360 /* No error handling, because we want to send the notification
1361 * even if we can't attach the counters. */
1362 ovpn_notif_add_counters(nvl, n);
1372 ovpn_ioctl_get(struct ifnet *ifp, struct ifdrv *ifd)
1374 struct ovpn_softc *sc = ifp->if_softc;
1375 nvlist_t *nvl = NULL;
1378 switch (ifd->ifd_cmd) {
1379 case OVPN_GET_STATS:
1380 error = ovpn_get_stats(sc, &nvl);
1382 case OVPN_GET_PEER_STATS:
1383 error = ovpn_get_peer_stats(sc, &nvl);
1386 error = ovpn_poll_pkt(sc, &nvl);
1389 error = opvn_get_pkt(sc, &nvl);
1397 void *packed = NULL;
1402 packed = nvlist_pack(nvl, &len);
1404 nvlist_destroy(nvl);
1408 if (len > ifd->ifd_len) {
1409 free(packed, M_NVLIST);
1410 nvlist_destroy(nvl);
1414 error = copyout(packed, ifd->ifd_data, len);
1417 free(packed, M_NVLIST);
1418 nvlist_destroy(nvl);
1425 ovpn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1430 CURVNET_ASSERT_SET();
1435 error = priv_check(curthread, PRIV_NET_OVPN);
1443 ifd = (struct ifdrv *)data;
1444 error = ovpn_ioctl_set(ifp, ifd);
1447 ifd = (struct ifdrv *)data;
1448 error = ovpn_ioctl_get(ifp, ifd);
1451 struct ifreq *ifr = (struct ifreq *)data;
1452 if (ifr->ifr_mtu < OVPN_MTU_MIN || ifr->ifr_mtu > OVPN_MTU_MAX)
1455 ifp->if_mtu = ifr->ifr_mtu;
1472 ovpn_encrypt_tx_cb(struct cryptop *crp)
1474 struct epoch_tracker et;
1475 struct ovpn_kpeer *peer = crp->crp_opaque;
1476 struct ovpn_softc *sc = peer->sc;
1477 struct mbuf *m = crp->crp_buf.cb_mbuf;
1481 CURVNET_SET(sc->ifp->if_vnet);
1482 NET_EPOCH_ENTER(et);
1484 if (crp->crp_etype != 0) {
1485 crypto_freereq(crp);
1486 ovpn_peer_release_ref(peer, false);
1489 OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
1494 MPASS(crp->crp_buf.cb_type == CRYPTO_BUF_MBUF);
1496 tunnel_len = m->m_pkthdr.len - sizeof(struct ovpn_wire_header);
1497 ret = ovpn_encap(sc, peer->peerid, m);
1499 OVPN_COUNTER_ADD(sc, sent_data_pkts, 1);
1500 OVPN_COUNTER_ADD(sc, tunnel_bytes_sent, tunnel_len);
1503 crypto_freereq(crp);
1504 ovpn_peer_release_ref(peer, false);
1513 ovpn_finish_rx(struct ovpn_softc *sc, struct mbuf *m,
1514 struct ovpn_kpeer *peer, struct ovpn_kkey *key, uint32_t seq,
1515 struct rm_priotracker *_ovpn_lock_trackerp)
1522 /* Replay protection. */
1523 if (V_replay_protection && ! ovpn_check_replay(key->decrypt, seq)) {
1525 OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
1531 *zpcpu_get(peer->last_active) = time_uptime;
1536 OVPN_COUNTER_ADD(sc, received_data_pkts, 1);
1537 OVPN_COUNTER_ADD(sc, tunnel_bytes_received, m->m_pkthdr.len);
1538 OVPN_PEER_COUNTER_ADD(peer, pkt_in, 1);
1539 OVPN_PEER_COUNTER_ADD(peer, bytes_in, m->m_pkthdr.len);
1541 /* Receive the packet on our interface. */
1542 m->m_pkthdr.rcvif = sc->ifp;
1544 /* Clear checksum flags in case the real hardware set them. */
1545 m->m_pkthdr.csum_flags = 0;
1547 /* Clear mbuf tags & flags */
1548 m_tag_delete_nonpersistent(m);
1551 /* Ensure we can read the first byte. */
1554 OVPN_COUNTER_ADD(sc, nomem_data_pkts_in, 1);
1559 * Check for address family, and disregard any control packets (e.g.
1562 af = ovpn_get_af(m);
1564 BPF_MTAP2(sc->ifp, &af, sizeof(af), m);
1565 if (V_async_netisr_queue)
1566 netisr_queue(af == AF_INET ? NETISR_IP : NETISR_IPV6, m);
1568 netisr_dispatch(af == AF_INET ? NETISR_IP : NETISR_IPV6, m);
1570 OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
1575 static struct ovpn_kkey *
1576 ovpn_find_key(struct ovpn_softc *sc, struct ovpn_kpeer *peer,
1577 const struct ovpn_wire_header *ohdr)
1579 struct ovpn_kkey *key = NULL;
1584 keyid = (ntohl(ohdr->opcode) >> 24) & 0x07;
1586 if (peer->keys[0].keyid == keyid)
1587 key = &peer->keys[0];
1588 else if (peer->keys[1].keyid == keyid)
1589 key = &peer->keys[1];
1595 ovpn_decrypt_rx_cb(struct cryptop *crp)
1597 struct epoch_tracker et;
1598 struct ovpn_softc *sc = crp->crp_opaque;
1599 struct mbuf *m = crp->crp_buf.cb_mbuf;
1600 struct ovpn_kkey *key;
1601 struct ovpn_kpeer *peer;
1602 struct ovpn_wire_header *ohdr;
1609 MPASS(crp->crp_buf.cb_type == CRYPTO_BUF_MBUF);
1611 if (crp->crp_etype != 0) {
1612 crypto_freereq(crp);
1613 atomic_add_int(&sc->refcount, -1);
1614 OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
1620 CURVNET_SET(sc->ifp->if_vnet);
1622 ohdr = mtodo(m, sizeof(struct udphdr));
1624 peerid = ntohl(ohdr->opcode) & 0x00ffffff;
1625 peer = ovpn_find_peer(sc, peerid);
1627 /* No such peer. Drop packet. */
1628 crypto_freereq(crp);
1629 atomic_add_int(&sc->refcount, -1);
1631 OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
1637 key = ovpn_find_key(sc, peer, ohdr);
1639 crypto_freereq(crp);
1640 atomic_add_int(&sc->refcount, -1);
1642 * Has this key been removed between us starting the decrypt
1646 OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
1652 /* Now remove the outer headers */
1653 m_adj_decap(m, sizeof(struct udphdr) +
1654 sizeof(struct ovpn_wire_header));
1656 NET_EPOCH_ENTER(et);
1657 ovpn_finish_rx(sc, m, peer, key, ntohl(ohdr->seq), _ovpn_lock_trackerp);
1659 OVPN_UNLOCK_ASSERT(sc);
1663 crypto_freereq(crp);
1664 atomic_add_int(&sc->refcount, -1);
1670 ovpn_get_af(struct mbuf *m)
1673 struct ip6_hdr *ip6;
1676 * We should pullup, but we're only interested in the first byte, so
1677 * that'll always be contiguous.
1679 ip = mtod(m, struct ip *);
1680 if (ip->ip_v == IPVERSION)
1683 ip6 = mtod(m, struct ip6_hdr *);
1684 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION)
1691 static struct ovpn_kpeer *
1692 ovpn_find_peer_by_ip(struct ovpn_softc *sc, const struct in_addr addr)
1694 struct ovpn_kpeer *peer = NULL;
1698 /* TODO: Add a second RB so we can look up by IP. */
1699 RB_FOREACH(peer, ovpn_kpeers, &sc->peers) {
1700 if (addr.s_addr == peer->vpn4.s_addr)
1709 static struct ovpn_kpeer *
1710 ovpn_find_peer_by_ip6(struct ovpn_softc *sc, const struct in6_addr *addr)
1712 struct ovpn_kpeer *peer = NULL;
1716 /* TODO: Add a third RB so we can look up by IPv6 address. */
1717 RB_FOREACH(peer, ovpn_kpeers, &sc->peers) {
1718 if (memcmp(addr, &peer->vpn6, sizeof(*addr)) == 0)
1726 static struct ovpn_kpeer *
1727 ovpn_route_peer(struct ovpn_softc *sc, struct mbuf **m0,
1728 const struct sockaddr *dst)
1730 struct ovpn_kpeer *peer = NULL;
1736 /* Shortcut if we're a client (or are a server and have only one client). */
1737 if (sc->peercount == 1)
1738 return (ovpn_find_only_peer(sc));
1741 af = dst->sa_family;
1743 af = ovpn_get_af(*m0);
1748 const struct sockaddr_in *sa = (const struct sockaddr_in *)dst;
1749 struct nhop_object *nh;
1750 const struct in_addr *ip_dst;
1753 ip_dst = &sa->sin_addr;
1757 *m0 = m_pullup(*m0, sizeof(struct ip));
1760 ip = mtod(*m0, struct ip *);
1761 ip_dst = &ip->ip_dst;
1764 peer = ovpn_find_peer_by_ip(sc, *ip_dst);
1765 SDT_PROBE2(if_ovpn, tx, route, ip4, ip_dst, peer);
1767 nh = fib4_lookup(M_GETFIB(*m0), *ip_dst, 0,
1769 if (nh && (nh->nh_flags & NHF_GATEWAY)) {
1770 peer = ovpn_find_peer_by_ip(sc,
1771 nh->gw4_sa.sin_addr);
1772 SDT_PROBE2(if_ovpn, tx, route, ip4,
1773 &nh->gw4_sa.sin_addr, peer);
1781 const struct sockaddr_in6 *sa6 =
1782 (const struct sockaddr_in6 *)dst;
1783 struct nhop_object *nh;
1784 const struct in6_addr *ip6_dst;
1787 ip6_dst = &sa6->sin6_addr;
1789 struct ip6_hdr *ip6;
1791 *m0 = m_pullup(*m0, sizeof(struct ip6_hdr));
1794 ip6 = mtod(*m0, struct ip6_hdr *);
1795 ip6_dst = &ip6->ip6_dst;
1798 peer = ovpn_find_peer_by_ip6(sc, ip6_dst);
1799 SDT_PROBE2(if_ovpn, tx, route, ip6, ip6_dst, peer);
1801 nh = fib6_lookup(M_GETFIB(*m0), ip6_dst, 0,
1803 if (nh && (nh->nh_flags & NHF_GATEWAY)) {
1804 peer = ovpn_find_peer_by_ip6(sc,
1805 &nh->gw6_sa.sin6_addr);
1806 SDT_PROBE2(if_ovpn, tx, route, ip6,
1807 &nh->gw6_sa.sin6_addr, peer);
1819 ovpn_transmit(struct ifnet *ifp, struct mbuf *m)
1821 return (ifp->if_output(ifp, m, NULL, NULL));
1825 ovpn_transmit_to_peer(struct ifnet *ifp, struct mbuf *m,
1826 struct ovpn_kpeer *peer, struct rm_priotracker *_ovpn_lock_trackerp)
1828 struct ovpn_wire_header *ohdr;
1829 struct ovpn_kkey *key;
1830 struct ovpn_softc *sc;
1831 struct cryptop *crp;
1834 size_t len, ovpn_hdr_len;
1842 tunnel_len = m->m_pkthdr.len;
1844 key = &peer->keys[OVPN_KEY_SLOT_PRIMARY];
1845 if (key->encrypt == NULL) {
1846 if (_ovpn_lock_trackerp != NULL)
1852 af = ovpn_get_af(m);
1853 /* Don't capture control packets. */
1855 BPF_MTAP2(ifp, &af, sizeof(af), m);
1857 len = m->m_pkthdr.len;
1858 MPASS(len <= ifp->if_mtu);
1860 ovpn_hdr_len = sizeof(struct ovpn_wire_header);
1861 if (key->encrypt->cipher == OVPN_CIPHER_ALG_NONE)
1862 ovpn_hdr_len -= 16; /* No auth tag. */
1864 M_PREPEND(m, ovpn_hdr_len, M_NOWAIT);
1866 if (_ovpn_lock_trackerp != NULL)
1868 OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
1871 ohdr = mtod(m, struct ovpn_wire_header *);
1872 ohdr->opcode = (OVPN_OP_DATA_V2 << OVPN_OP_SHIFT) | key->keyid;
1873 ohdr->opcode <<= 24;
1874 ohdr->opcode |= key->peerid;
1875 ohdr->opcode = htonl(ohdr->opcode);
1877 seq64 = atomic_fetchadd_64(&peer->keys[OVPN_KEY_SLOT_PRIMARY].encrypt->tx_seq, 1);
1878 if (seq64 == OVPN_SEQ_ROTATE) {
1879 ovpn_notify_key_rotation(sc, peer);
1880 } else if (seq64 > UINT32_MAX) {
1881 /* We've wrapped, give up on this packet. */
1882 if (_ovpn_lock_trackerp != NULL)
1884 OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
1886 /* Let's avoid (very unlikely, but still) wraparounds of the
1887 * 64-bit counter taking us back to 0. */
1888 atomic_store_64(&peer->keys[OVPN_KEY_SLOT_PRIMARY].encrypt->tx_seq,
1894 seq = htonl(seq64 & UINT32_MAX);
1897 OVPN_PEER_COUNTER_ADD(peer, pkt_out, 1);
1898 OVPN_PEER_COUNTER_ADD(peer, bytes_out, len);
1900 if (key->encrypt->cipher == OVPN_CIPHER_ALG_NONE) {
1901 ret = ovpn_encap(sc, peer->peerid, m);
1902 if (_ovpn_lock_trackerp != NULL)
1905 OVPN_COUNTER_ADD(sc, sent_data_pkts, 1);
1906 OVPN_COUNTER_ADD(sc, tunnel_bytes_sent, tunnel_len);
1911 crp = crypto_getreq(key->encrypt->cryptoid, M_NOWAIT);
1913 if (_ovpn_lock_trackerp != NULL)
1915 OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
1920 /* Encryption covers only the payload, not the header. */
1921 crp->crp_payload_start = sizeof(*ohdr);
1922 crp->crp_payload_length = len;
1923 crp->crp_op = CRYPTO_OP_ENCRYPT;
1926 * AAD data covers the ovpn_wire_header minus the auth
1929 crp->crp_aad_length = sizeof(*ohdr) - sizeof(ohdr->auth_tag);
1930 crp->crp_aad = ohdr;
1931 crp->crp_aad_start = 0;
1932 crp->crp_op |= CRYPTO_OP_COMPUTE_DIGEST;
1933 crp->crp_digest_start = offsetof(struct ovpn_wire_header, auth_tag);
1935 crp->crp_flags |= CRYPTO_F_IV_SEPARATE;
1936 memcpy(crp->crp_iv, &seq, sizeof(seq));
1937 memcpy(crp->crp_iv + sizeof(seq), key->encrypt->nonce,
1938 key->encrypt->noncelen);
1940 crypto_use_mbuf(crp, m);
1941 crp->crp_flags |= CRYPTO_F_CBIFSYNC;
1942 crp->crp_callback = ovpn_encrypt_tx_cb;
1943 crp->crp_opaque = peer;
1945 atomic_add_int(&peer->refcount, 1);
1946 if (_ovpn_lock_trackerp != NULL)
1949 ret = crypto_dispatch_async(crp, CRYPTO_ASYNC_ORDERED);
1951 ret = crypto_dispatch(crp);
1953 OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
1960 * Note: Expects to hold the read lock on entry, and will release it itself.
1963 ovpn_encap(struct ovpn_softc *sc, uint32_t peerid, struct mbuf *m)
1966 struct ovpn_kpeer *peer;
1974 peer = ovpn_find_peer(sc, peerid);
1975 if (peer == NULL || sc->ifp->if_link_state != LINK_STATE_UP) {
1977 OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
1982 len = m->m_pkthdr.len;
1984 M_PREPEND(m, sizeof(struct udphdr), M_NOWAIT);
1987 OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
1991 udp = mtod(m, struct udphdr *);
1993 MPASS(peer->local.ss_family == peer->remote.ss_family);
1995 udp->uh_sport = ovpn_get_port(&peer->local);
1996 udp->uh_dport = ovpn_get_port(&peer->remote);
1997 udp->uh_ulen = htons(sizeof(struct udphdr) + len);
1999 switch (peer->remote.ss_family) {
2002 struct sockaddr_in *in_local = TO_IN(&peer->local);
2003 struct sockaddr_in *in_remote = TO_IN(&peer->remote);
2007 * This requires knowing the source IP, which we don't. Happily
2008 * we're allowed to keep this at 0, and the checksum won't do
2009 * anything the crypto won't already do.
2013 /* Set the checksum flags so we recalculate checksums. */
2014 m->m_pkthdr.csum_flags |= CSUM_IP;
2015 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
2017 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
2020 OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
2023 ip = mtod(m, struct ip *);
2026 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct udphdr) +
2029 ip->ip_ttl = V_ip_defttl;
2030 ip->ip_p = IPPROTO_UDP;
2032 if (in_local->sin_port != 0)
2033 ip->ip_src = in_local->sin_addr;
2035 ip->ip_src.s_addr = INADDR_ANY;
2036 ip->ip_dst = in_remote->sin_addr;
2039 OVPN_COUNTER_ADD(sc, transport_bytes_sent, m->m_pkthdr.len);
2041 return (ip_output(m, NULL, NULL, 0, NULL, NULL));
2046 struct sockaddr_in6 *in6_local = TO_IN6(&peer->local);
2047 struct sockaddr_in6 *in6_remote = TO_IN6(&peer->remote);
2048 struct ip6_hdr *ip6;
2050 M_PREPEND(m, sizeof(struct ip6_hdr), M_NOWAIT);
2053 OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
2056 m = m_pullup(m, sizeof(*ip6) + sizeof(*udp));
2059 OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
2063 ip6 = mtod(m, struct ip6_hdr *);
2065 ip6->ip6_vfc = IPV6_VERSION;
2066 ip6->ip6_flow &= ~IPV6_FLOWINFO_MASK;
2067 ip6->ip6_plen = htons(sizeof(*ip6) + sizeof(struct udphdr) +
2069 ip6->ip6_nxt = IPPROTO_UDP;
2070 ip6->ip6_hlim = V_ip6_defhlim;
2072 memcpy(&ip6->ip6_src, &in6_local->sin6_addr,
2073 sizeof(ip6->ip6_src));
2074 memcpy(&ip6->ip6_dst, &in6_remote->sin6_addr,
2075 sizeof(ip6->ip6_dst));
2077 udp = mtodo(m, sizeof(*ip6));
2078 udp->uh_sum = in6_cksum_pseudo(ip6,
2079 m->m_pkthdr.len - sizeof(struct ip6_hdr),
2082 m->m_pkthdr.csum_flags |= CSUM_UDP_IPV6;
2083 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
2086 OVPN_COUNTER_ADD(sc, transport_bytes_sent, m->m_pkthdr.len);
2088 return (ip6_output(m, NULL, NULL, IPV6_UNSPECSRC, NULL, NULL,
2093 panic("Unsupported address family %d",
2094 peer->remote.ss_family);
2099 ovpn_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
2102 struct ovpn_softc *sc;
2103 struct ovpn_kpeer *peer;
2111 SDT_PROBE1(if_ovpn, tx, transmit, start, m);
2113 if (__predict_false(ifp->if_link_state != LINK_STATE_UP)) {
2114 OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
2121 * Only obey 'dst' (i.e. the gateway) if no route is supplied.
2122 * That's our indication that we're being called through pf's route-to,
2123 * and we should route according to 'dst' instead. We can't do so
2124 * consistently, because the usual openvpn configuration sets the first
2125 * non-server IP in the subnet as the gateway. If we always use that
2126 * one we'd end up routing all traffic to the first client.
2127 * tl;dr: 'ro == NULL' tells us pf is doing a route-to, and then but
2128 * only then, we should treat 'dst' as the destination. */
2129 peer = ovpn_route_peer(sc, &m, ro == NULL ? dst : NULL);
2131 /* No destination. */
2132 OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
2138 return (ovpn_transmit_to_peer(ifp, m, peer, _ovpn_lock_trackerp));
2142 ovpn_check_replay(struct ovpn_kkey_dir *key, uint32_t seq)
2146 mtx_lock(&key->replay_mtx);
2148 /* Sequence number must be strictly greater than rx_seq */
2149 if (seq <= key->rx_seq) {
2150 mtx_unlock(&key->replay_mtx);
2154 /* Large jump. The packet authenticated okay, so just accept that. */
2155 if (seq > (key->rx_seq + (sizeof(key->rx_window) * 8))) {
2158 mtx_unlock(&key->replay_mtx);
2163 if ((seq == key->rx_seq + 1) && key->rx_window == 0) {
2165 mtx_unlock(&key->replay_mtx);
2169 d = seq - key->rx_seq - 1;
2171 if (key->rx_window & ((uint64_t)1 << d)) {
2173 mtx_unlock(&key->replay_mtx);
2177 key->rx_window |= (uint64_t)1 << d;
2179 while (key->rx_window & 1) {
2181 key->rx_window >>= 1;
2184 mtx_unlock(&key->replay_mtx);
2189 static struct ovpn_kpeer *
2190 ovpn_peer_from_mbuf(struct ovpn_softc *sc, struct mbuf *m, int off)
2192 struct ovpn_wire_header ohdr;
2194 const size_t hdrlen = sizeof(ohdr) - sizeof(ohdr.auth_tag);
2198 if (m_length(m, NULL) < (off + sizeof(struct udphdr) + hdrlen))
2201 m_copydata(m, off + sizeof(struct udphdr), hdrlen, (caddr_t)&ohdr);
2203 peerid = ntohl(ohdr.opcode) & 0x00ffffff;
2205 return (ovpn_find_peer(sc, peerid));
2209 ovpn_udp_input(struct mbuf *m, int off, struct inpcb *inp,
2210 const struct sockaddr *sa, void *ctx)
2212 struct ovpn_softc *sc = ctx;
2213 struct ovpn_wire_header tmphdr;
2214 struct ovpn_wire_header *ohdr;
2215 struct udphdr *uhdr;
2216 struct ovpn_kkey *key;
2217 struct cryptop *crp;
2218 struct ovpn_kpeer *peer;
2227 OVPN_COUNTER_ADD(sc, transport_bytes_received, m->m_pkthdr.len - off);
2229 ohdrlen = sizeof(*ohdr) - sizeof(ohdr->auth_tag);
2233 peer = ovpn_peer_from_mbuf(sc, m, off);
2239 if (m_length(m, NULL) < (off + sizeof(*uhdr) + ohdrlen)) {
2245 m_copydata(m, off + sizeof(*uhdr), ohdrlen, (caddr_t)&tmphdr);
2247 op = ntohl(tmphdr.opcode) >> 24 >> OVPN_OP_SHIFT;
2248 if (op != OVPN_OP_DATA_V2) {
2249 /* Control packet? */
2254 m = m_pullup(m, off + sizeof(*uhdr) + ohdrlen);
2257 OVPN_COUNTER_ADD(sc, nomem_data_pkts_in, 1);
2262 * Simplify things by getting rid of the preceding headers, we don't
2265 m_adj_decap(m, off);
2268 ohdr = mtodo(m, sizeof(*uhdr));
2270 key = ovpn_find_key(sc, peer, ohdr);
2271 if (key == NULL || key->decrypt == NULL) {
2273 OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
2278 if (key->decrypt->cipher == OVPN_CIPHER_ALG_NONE) {
2279 /* Now remove the outer headers */
2280 m_adj_decap(m, sizeof(struct udphdr) + ohdrlen);
2282 ohdr = mtodo(m, sizeof(*uhdr));
2284 ovpn_finish_rx(sc, m, peer, key, ntohl(ohdr->seq),
2285 _ovpn_lock_trackerp);
2286 OVPN_UNLOCK_ASSERT(sc);
2290 ohdrlen += sizeof(ohdr->auth_tag);
2292 m = m_pullup(m, sizeof(*uhdr) + ohdrlen);
2295 OVPN_COUNTER_ADD(sc, nomem_data_pkts_in, 1);
2299 ohdr = mtodo(m, sizeof(*uhdr));
2302 crp = crypto_getreq(key->decrypt->cryptoid, M_NOWAIT);
2304 OVPN_COUNTER_ADD(sc, nomem_data_pkts_in, 1);
2310 crp->crp_payload_start = sizeof(struct udphdr) + sizeof(*ohdr);
2311 crp->crp_payload_length = ntohs(uhdr->uh_ulen) -
2312 sizeof(*uhdr) - sizeof(*ohdr);
2313 crp->crp_op = CRYPTO_OP_DECRYPT;
2315 /* AAD validation. */
2316 crp->crp_aad_length = sizeof(*ohdr) - sizeof(ohdr->auth_tag);
2317 crp->crp_aad = ohdr;
2318 crp->crp_aad_start = 0;
2319 crp->crp_op |= CRYPTO_OP_VERIFY_DIGEST;
2320 crp->crp_digest_start = sizeof(struct udphdr) +
2321 offsetof(struct ovpn_wire_header, auth_tag);
2323 crp->crp_flags |= CRYPTO_F_IV_SEPARATE;
2324 memcpy(crp->crp_iv, &ohdr->seq, sizeof(ohdr->seq));
2325 memcpy(crp->crp_iv + sizeof(ohdr->seq), key->decrypt->nonce,
2326 key->decrypt->noncelen);
2328 crypto_use_mbuf(crp, m);
2329 crp->crp_flags |= CRYPTO_F_CBIFSYNC;
2330 crp->crp_callback = ovpn_decrypt_rx_cb;
2331 crp->crp_opaque = sc;
2333 atomic_add_int(&sc->refcount, 1);
2336 ret = crypto_dispatch_async(crp, CRYPTO_ASYNC_ORDERED);
2338 ret = crypto_dispatch(crp);
2340 OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
2347 ovpn_qflush(struct ifnet *ifp __unused)
2353 ovpn_flush_rxring(struct ovpn_softc *sc)
2355 struct ovpn_notification *n;
2359 while (! buf_ring_empty(sc->notifring)) {
2360 n = buf_ring_dequeue_sc(sc->notifring);
2367 ovpn_reassign(struct ifnet *ifp, struct vnet *new_vnet __unused,
2368 char *unused __unused)
2370 struct ovpn_softc *sc = ifp->if_softc;
2371 struct ovpn_kpeer *peer, *tmppeer;
2376 /* Flush keys & configuration. */
2377 RB_FOREACH_SAFE(peer, ovpn_kpeers, &sc->peers, tmppeer) {
2378 peer->del_reason = OVPN_DEL_REASON_REQUESTED;
2379 ret = _ovpn_del_peer(sc, peer);
2383 ovpn_flush_rxring(sc);
2390 ovpn_clone_match(struct if_clone *ifc, const char *name)
2393 * Allow all names that start with 'ovpn', specifically because pfSense
2394 * uses ovpnc1 / ovpns2
2396 return (strncmp(ovpnname, name, strlen(ovpnname)) == 0);
2400 ovpn_clone_create(struct if_clone *ifc, char *name, size_t len,
2401 struct ifc_data *ifd, struct ifnet **ifpp)
2403 struct ovpn_softc *sc;
2406 int error, unit, wildcard;
2408 /* Try to see if a special unit was requested. */
2409 error = ifc_name2unit(name, &unit);
2412 wildcard = (unit < 0);
2414 error = ifc_alloc_unit(ifc, &unit);
2419 * If no unit had been given, we need to adjust the ifName.
2421 for (dp = name; *dp != '\0'; dp++);
2423 error = snprintf(dp, len - (dp - name), "%d", unit);
2424 if (error > len - (dp - name)) {
2425 /* ifName too long. */
2426 ifc_free_unit(ifc, unit);
2432 /* Make sure it doesn't already exist. */
2433 if (ifunit(name) != NULL)
2436 sc = malloc(sizeof(struct ovpn_softc), M_OVPN, M_WAITOK | M_ZERO);
2437 sc->ifp = if_alloc(IFT_ENC);
2438 rm_init_flags(&sc->lock, "if_ovpn_lock", RM_RECURSE);
2441 sc->notifring = buf_ring_alloc(32, M_OVPN, M_WAITOK, NULL);
2443 COUNTER_ARRAY_ALLOC(sc->counters, OVPN_COUNTER_SIZE, M_WAITOK);
2447 strlcpy(ifp->if_xname, name, IFNAMSIZ);
2448 ifp->if_dname = ovpngroupname;
2449 ifp->if_dunit = unit;
2451 ifp->if_addrlen = 0;
2453 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
2454 ifp->if_ioctl = ovpn_ioctl;
2455 ifp->if_transmit = ovpn_transmit;
2456 ifp->if_output = ovpn_output;
2457 ifp->if_qflush = ovpn_qflush;
2459 ifp->if_reassign = ovpn_reassign;
2461 ifp->if_capabilities |= IFCAP_LINKSTATE;
2462 ifp->if_capenable |= IFCAP_LINKSTATE;
2465 bpfattach(ifp, DLT_NULL, sizeof(uint32_t));
2472 ovpn_clone_destroy_cb(struct epoch_context *ctx)
2474 struct ovpn_softc *sc;
2476 sc = __containerof(ctx, struct ovpn_softc, epoch_ctx);
2478 MPASS(sc->peercount == 0);
2479 MPASS(RB_EMPTY(&sc->peers));
2481 COUNTER_ARRAY_FREE(sc->counters, OVPN_COUNTER_SIZE);
2488 ovpn_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
2490 struct ovpn_softc *sc;
2491 struct ovpn_kpeer *peer, *tmppeer;
2496 unit = ifp->if_dunit;
2500 if (atomic_load_int(&sc->refcount) > 0) {
2505 RB_FOREACH_SAFE(peer, ovpn_kpeers, &sc->peers, tmppeer) {
2506 peer->del_reason = OVPN_DEL_REASON_REQUESTED;
2507 ret = _ovpn_del_peer(sc, peer);
2511 ovpn_flush_rxring(sc);
2512 buf_ring_free(sc->notifring, M_OVPN);
2518 ifp->if_softc = NULL;
2520 NET_EPOCH_CALL(ovpn_clone_destroy_cb, &sc->epoch_ctx);
2522 if (unit != IF_DUNIT_NONE)
2523 ifc_free_unit(ifc, unit);
2525 NET_EPOCH_DRAIN_CALLBACKS();
2531 vnet_ovpn_init(const void *unused __unused)
2533 struct if_clone_addreq req = {
2534 .match_f = ovpn_clone_match,
2535 .create_f = ovpn_clone_create,
2536 .destroy_f = ovpn_clone_destroy,
2538 V_ovpn_cloner = ifc_attach_cloner(ovpngroupname, &req);
2540 VNET_SYSINIT(vnet_ovpn_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
2541 vnet_ovpn_init, NULL);
2544 vnet_ovpn_uninit(const void *unused __unused)
2546 if_clone_detach(V_ovpn_cloner);
2548 VNET_SYSUNINIT(vnet_ovpn_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
2549 vnet_ovpn_uninit, NULL);
2552 ovpnmodevent(module_t mod, int type, void *data)
2556 /* Done in vnet_ovpn_init() */
2559 /* Done in vnet_ovpn_uninit() */
2562 return (EOPNOTSUPP);
2568 static moduledata_t ovpn_mod = {
2574 DECLARE_MODULE(if_ovpn, ovpn_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
2575 MODULE_VERSION(if_ovpn, 1);