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freebsd-dev/sys/net/if_ovpn.c
Kristof Provost 57fcf46dee if_ovpn: ovpn_find_peer_by_ip() is unused without INET 
Don't define ovpn_find_peer_by_ip() if INET is not set, and do the same
for ovpn_find_peer_by_ip6() and INET6.

Reported by:	mjg
Sponsored by:	Rubicon Communications, LLC ("Netgate")
2023-02-23 05:56:56 +01:00

2535 lines
56 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2021-2022 Rubicon Communications, LLC (Netgate)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf_ring.h>
#include <sys/epoch.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/nv.h>
#include <sys/priv.h>
#include <sys/protosw.h>
#include <sys/rmlock.h>
#include <sys/sdt.h>
#include <sys/smp.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <machine/atomic.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_clone.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/netisr.h>
#include <net/route/nhop.h>
#include <netinet/in.h>
#include <netinet/in_fib.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_fib.h>
#include <machine/in_cksum.h>
#include <opencrypto/cryptodev.h>
#include "if_ovpn.h"
struct ovpn_kkey_dir {
int refcount;
uint8_t key[32];
uint8_t keylen;
uint8_t nonce[8];
uint8_t noncelen;
enum ovpn_key_cipher cipher;
crypto_session_t cryptoid;
struct mtx replay_mtx;
/*
* Last seen gapless sequence number. New rx seq numbers must be
* strictly higher than this.
*/
uint32_t rx_seq;
/* Seen packets, relative to rx_seq. bit(0) will always be 0. */
uint64_t rx_window;
};
struct ovpn_kkey {
struct ovpn_kkey_dir *encrypt;
struct ovpn_kkey_dir *decrypt;
uint8_t keyid;
uint32_t peerid;
};
struct ovpn_keepalive {
uint32_t interval;
uint32_t timeout;
};
struct ovpn_wire_header {
uint32_t opcode; /* opcode, key id, peer id */
uint32_t seq;
uint8_t auth_tag[16];
};
struct ovpn_peer_counters {
uint64_t pkt_in;
uint64_t pkt_out;
uint64_t bytes_in;
uint64_t bytes_out;
};
#define OVPN_PEER_COUNTER_SIZE (sizeof(struct ovpn_peer_counters)/sizeof(uint64_t))
struct ovpn_notification {
enum ovpn_notif_type type;
uint32_t peerid;
/* Delete notification */
enum ovpn_del_reason del_reason;
struct ovpn_peer_counters counters;
};
struct ovpn_softc;
struct ovpn_kpeer {
RB_ENTRY(ovpn_kpeer) tree;
int refcount;
uint32_t peerid;
struct ovpn_softc *sc;
struct sockaddr_storage local;
struct sockaddr_storage remote;
struct in_addr vpn4;
struct in6_addr vpn6;
struct ovpn_kkey keys[2];
uint32_t tx_seq;
enum ovpn_del_reason del_reason;
struct ovpn_keepalive keepalive;
uint32_t *last_active;
struct callout ping_send;
struct callout ping_rcv;
counter_u64_t counters[OVPN_PEER_COUNTER_SIZE];
};
struct ovpn_counters {
uint64_t lost_ctrl_pkts_in;
uint64_t lost_ctrl_pkts_out;
uint64_t lost_data_pkts_in;
uint64_t lost_data_pkts_out;
uint64_t nomem_data_pkts_in;
uint64_t nomem_data_pkts_out;
uint64_t received_ctrl_pkts;
uint64_t received_data_pkts;
uint64_t sent_ctrl_pkts;
uint64_t sent_data_pkts;
uint64_t transport_bytes_sent;
uint64_t transport_bytes_received;
uint64_t tunnel_bytes_sent;
uint64_t tunnel_bytes_received;
};
#define OVPN_COUNTER_SIZE (sizeof(struct ovpn_counters)/sizeof(uint64_t))
RB_HEAD(ovpn_kpeers, ovpn_kpeer);
struct ovpn_softc {
int refcount;
struct rmlock lock;
struct ifnet *ifp;
struct socket *so;
int peercount;
struct ovpn_kpeers peers;
/* Pending notification */
struct buf_ring *notifring;
counter_u64_t counters[OVPN_COUNTER_SIZE];
struct epoch_context epoch_ctx;
};
static struct ovpn_kpeer *ovpn_find_peer(struct ovpn_softc *, uint32_t);
static bool ovpn_udp_input(struct mbuf *, int, struct inpcb *,
const struct sockaddr *, void *);
static int ovpn_transmit_to_peer(struct ifnet *, struct mbuf *,
struct ovpn_kpeer *, struct rm_priotracker *);
static int ovpn_encap(struct ovpn_softc *, uint32_t, struct mbuf *);
static int ovpn_get_af(struct mbuf *);
static void ovpn_free_kkey_dir(struct ovpn_kkey_dir *);
static bool ovpn_check_replay(struct ovpn_kkey_dir *, uint32_t);
static int ovpn_peer_compare(struct ovpn_kpeer *, struct ovpn_kpeer *);
static RB_PROTOTYPE(ovpn_kpeers, ovpn_kpeer, tree, ovpn_peer_compare);
static RB_GENERATE(ovpn_kpeers, ovpn_kpeer, tree, ovpn_peer_compare);
#define OVPN_MTU_MIN 576
#define OVPN_MTU_MAX (IP_MAXPACKET - sizeof(struct ip) - \
sizeof(struct udphdr) - sizeof(struct ovpn_wire_header))
#define OVPN_OP_DATA_V2 0x09
#define OVPN_OP_SHIFT 3
VNET_DEFINE_STATIC(struct if_clone *, ovpn_cloner);
#define V_ovpn_cloner VNET(ovpn_cloner)
#define OVPN_RLOCK_TRACKER struct rm_priotracker _ovpn_lock_tracker; \
struct rm_priotracker *_ovpn_lock_trackerp = &_ovpn_lock_tracker
#define OVPN_RLOCK(sc) rm_rlock(&(sc)->lock, _ovpn_lock_trackerp)
#define OVPN_RUNLOCK(sc) rm_runlock(&(sc)->lock, _ovpn_lock_trackerp)
#define OVPN_WLOCK(sc) rm_wlock(&(sc)->lock)
#define OVPN_WUNLOCK(sc) rm_wunlock(&(sc)->lock)
#define OVPN_ASSERT(sc) rm_assert(&(sc)->lock, RA_LOCKED)
#define OVPN_RASSERT(sc) rm_assert(&(sc)->lock, RA_RLOCKED)
#define OVPN_WASSERT(sc) rm_assert(&(sc)->lock, RA_WLOCKED)
#define OVPN_UNLOCK_ASSERT(sc) rm_assert(&(sc)->lock, RA_UNLOCKED)
#define OVPN_COUNTER(sc, name) \
((sc)->counters[offsetof(struct ovpn_counters, name)/sizeof(uint64_t)])
#define OVPN_PEER_COUNTER(peer, name) \
((peer)->counters[offsetof(struct ovpn_peer_counters, name) / \
sizeof(uint64_t)])
#define OVPN_COUNTER_ADD(sc, name, val) \
counter_u64_add(OVPN_COUNTER(sc, name), val)
#define OVPN_PEER_COUNTER_ADD(p, name, val) \
counter_u64_add(OVPN_PEER_COUNTER(p, name), val)
#define TO_IN(x) ((struct sockaddr_in *)(x))
#define TO_IN6(x) ((struct sockaddr_in6 *)(x))
SDT_PROVIDER_DEFINE(if_ovpn);
SDT_PROBE_DEFINE1(if_ovpn, tx, transmit, start, "struct mbuf *");
SDT_PROBE_DEFINE2(if_ovpn, tx, route, ip4, "struct in_addr *", "struct ovpn_kpeer *");
SDT_PROBE_DEFINE2(if_ovpn, tx, route, ip6, "struct in6_addr *", "struct ovpn_kpeer *");
static const char ovpnname[] = "ovpn";
static const char ovpngroupname[] = "openvpn";
static MALLOC_DEFINE(M_OVPN, ovpnname, "OpenVPN DCO Interface");
SYSCTL_DECL(_net_link);
static SYSCTL_NODE(_net_link, IFT_OTHER, openvpn, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"OpenVPN DCO Interface");
VNET_DEFINE_STATIC(int, replay_protection) = 0;
#define V_replay_protection VNET(replay_protection)
SYSCTL_INT(_net_link_openvpn, OID_AUTO, replay_protection, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(replay_protection), 0, "Validate sequence numbers");
VNET_DEFINE_STATIC(int, async_crypto);
#define V_async_crypto VNET(async_crypto)
SYSCTL_INT(_net_link_openvpn, OID_AUTO, async_crypto,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(async_crypto), 0,
"Use asynchronous mode to parallelize crypto jobs.");
VNET_DEFINE_STATIC(int, async_netisr_queue);
#define V_async_netisr_queue VNET(async_netisr_queue)
SYSCTL_INT(_net_link_openvpn, OID_AUTO, netisr_queue,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(async_netisr_queue), 0,
"Use netisr_queue() rather than netisr_dispatch().");
static int
ovpn_peer_compare(struct ovpn_kpeer *a, struct ovpn_kpeer *b)
{
return (a->peerid - b->peerid);
}
static struct ovpn_kpeer *
ovpn_find_peer(struct ovpn_softc *sc, uint32_t peerid)
{
struct ovpn_kpeer p;
OVPN_ASSERT(sc);
p.peerid = peerid;
return (RB_FIND(ovpn_kpeers, &sc->peers, &p));
}
static struct ovpn_kpeer *
ovpn_find_only_peer(struct ovpn_softc *sc)
{
OVPN_ASSERT(sc);
return (RB_ROOT(&sc->peers));
}
static uint16_t
ovpn_get_port(struct sockaddr_storage *s)
{
switch (s->ss_family) {
case AF_INET: {
struct sockaddr_in *in = (struct sockaddr_in *)s;
return (in->sin_port);
}
case AF_INET6: {
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)s;
return (in6->sin6_port);
}
default:
panic("Unsupported address family %d", s->ss_family);
}
}
static int
ovpn_nvlist_to_sockaddr(const nvlist_t *nvl, struct sockaddr_storage *sa)
{
int af;
if (! nvlist_exists_number(nvl, "af"))
return (EINVAL);
if (! nvlist_exists_binary(nvl, "address"))
return (EINVAL);
if (! nvlist_exists_number(nvl, "port"))
return (EINVAL);
af = nvlist_get_number(nvl, "af");
switch (af) {
#ifdef INET
case AF_INET: {
struct sockaddr_in *in = (struct sockaddr_in *)sa;
size_t len;
const void *addr = nvlist_get_binary(nvl, "address", &len);
in->sin_family = af;
if (len != sizeof(in->sin_addr))
return (EINVAL);
memcpy(&in->sin_addr, addr, sizeof(in->sin_addr));
in->sin_port = nvlist_get_number(nvl, "port");
break;
}
#endif
#ifdef INET6
case AF_INET6: {
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
size_t len;
const void *addr = nvlist_get_binary(nvl, "address", &len);
in6->sin6_family = af;
if (len != sizeof(in6->sin6_addr))
return (EINVAL);
memcpy(&in6->sin6_addr, addr, sizeof(in6->sin6_addr));
in6->sin6_port = nvlist_get_number(nvl, "port");
break;
}
#endif
default:
return (EINVAL);
}
return (0);
}
static bool
ovpn_has_peers(struct ovpn_softc *sc)
{
OVPN_ASSERT(sc);
return (sc->peercount > 0);
}
static void
ovpn_rele_so(struct ovpn_softc *sc, struct ovpn_kpeer *peer)
{
bool has_peers;
OVPN_WASSERT(sc);
if (sc->so == NULL)
return;
has_peers = ovpn_has_peers(sc);
/* Only remove the tunnel function if we're releasing the socket for
* the last peer. */
if (! has_peers)
(void)udp_set_kernel_tunneling(sc->so, NULL, NULL, NULL);
sorele(sc->so);
if (! has_peers)
sc->so = NULL;
}
static void
ovpn_notify_del_peer(struct ovpn_softc *sc, struct ovpn_kpeer *peer)
{
struct ovpn_notification *n;
OVPN_WASSERT(sc);
n = malloc(sizeof(*n), M_OVPN, M_NOWAIT);
if (n == NULL)
return;
n->peerid = peer->peerid;
n->type = OVPN_NOTIF_DEL_PEER;
n->del_reason = peer->del_reason;
n->counters.pkt_in = counter_u64_fetch(OVPN_PEER_COUNTER(peer, pkt_in));
n->counters.pkt_out = counter_u64_fetch(OVPN_PEER_COUNTER(peer, pkt_out));
n->counters.bytes_in = counter_u64_fetch(OVPN_PEER_COUNTER(peer, bytes_in));
n->counters.bytes_out = counter_u64_fetch(OVPN_PEER_COUNTER(peer, bytes_out));
if (buf_ring_enqueue(sc->notifring, n) != 0) {
free(n, M_OVPN);
} else if (sc->so != NULL) {
/* Wake up userspace */
sc->so->so_error = EAGAIN;
sorwakeup(sc->so);
sowwakeup(sc->so);
}
}
static void
ovpn_peer_release_ref(struct ovpn_kpeer *peer, bool locked)
{
struct ovpn_softc *sc;
CURVNET_ASSERT_SET();
atomic_add_int(&peer->refcount, -1);
if (atomic_load_int(&peer->refcount) > 0)
return;
sc = peer->sc;
if (! locked) {
OVPN_WLOCK(sc);
/* Might have changed before we acquired the lock. */
if (atomic_load_int(&peer->refcount) > 0) {
OVPN_WUNLOCK(sc);
return;
}
}
OVPN_ASSERT(sc);
/* The peer should have been removed from the list already. */
MPASS(ovpn_find_peer(sc, peer->peerid) == NULL);
ovpn_notify_del_peer(sc, peer);
for (int i = 0; i < 2; i++) {
ovpn_free_kkey_dir(peer->keys[i].encrypt);
ovpn_free_kkey_dir(peer->keys[i].decrypt);
}
ovpn_rele_so(sc, peer);
callout_stop(&peer->ping_send);
callout_stop(&peer->ping_rcv);
uma_zfree_pcpu(pcpu_zone_4, peer->last_active);
free(peer, M_OVPN);
if (! locked)
OVPN_WUNLOCK(sc);
}
static int
ovpn_new_peer(struct ifnet *ifp, const nvlist_t *nvl)
{
#ifdef INET6
struct epoch_tracker et;
#endif
struct sockaddr_storage remote;
struct ovpn_kpeer *peer = NULL;
struct file *fp = NULL;
struct sockaddr *name = NULL;
struct ovpn_softc *sc = ifp->if_softc;
struct thread *td = curthread;
struct socket *so = NULL;
int fd;
uint32_t peerid;
int ret = 0;
if (nvl == NULL)
return (EINVAL);
if (! nvlist_exists_number(nvl, "peerid"))
return (EINVAL);
if (! nvlist_exists_number(nvl, "fd"))
return (EINVAL);
if (! nvlist_exists_nvlist(nvl, "remote"))
return (EINVAL);
peerid = nvlist_get_number(nvl, "peerid");
ret = ovpn_nvlist_to_sockaddr(nvlist_get_nvlist(nvl, "remote"),
&remote);
if (ret != 0)
return (ret);
fd = nvlist_get_number(nvl, "fd");
/* Look up the userspace process and use the fd to find the socket. */
ret = getsock(td, fd, &cap_connect_rights, &fp);
if (ret != 0)
return (ret);
so = fp->f_data;
peer = malloc(sizeof(*peer), M_OVPN, M_WAITOK | M_ZERO);
peer->peerid = peerid;
peer->sc = sc;
peer->tx_seq = 1;
peer->refcount = 1;
peer->last_active = uma_zalloc_pcpu(pcpu_zone_4, M_WAITOK | M_ZERO);
COUNTER_ARRAY_ALLOC(peer->counters, OVPN_PEER_COUNTER_SIZE, M_WAITOK);
if (nvlist_exists_binary(nvl, "vpn_ipv4")) {
size_t len;
const void *addr = nvlist_get_binary(nvl, "vpn_ipv4", &len);
if (len != sizeof(peer->vpn4)) {
ret = EINVAL;
goto error;
}
memcpy(&peer->vpn4, addr, len);
}
if (nvlist_exists_binary(nvl, "vpn_ipv6")) {
size_t len;
const void *addr = nvlist_get_binary(nvl, "vpn_ipv6", &len);
if (len != sizeof(peer->vpn6)) {
ret = EINVAL;
goto error;
}
memcpy(&peer->vpn6, addr, len);
}
callout_init_rm(&peer->ping_send, &sc->lock, CALLOUT_SHAREDLOCK);
callout_init_rm(&peer->ping_rcv, &sc->lock, 0);
ret = so->so_proto->pr_sockaddr(so, &name);
if (ret)
goto error;
if (ovpn_get_port((struct sockaddr_storage *)name) == 0) {
ret = EINVAL;
goto error;
}
if (name->sa_family != remote.ss_family) {
ret = EINVAL;
goto error;
}
memcpy(&peer->local, name, name->sa_len);
memcpy(&peer->remote, &remote, sizeof(remote));
free(name, M_SONAME);
name = NULL;
if (peer->local.ss_family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&TO_IN6(&peer->remote)->sin6_addr)) {
/* V4 mapped address, so treat this as v4, not v6. */
in6_sin6_2_sin_in_sock((struct sockaddr *)&peer->local);
in6_sin6_2_sin_in_sock((struct sockaddr *)&peer->remote);
}
#ifdef INET6
if (peer->local.ss_family == AF_INET6 &&
IN6_IS_ADDR_UNSPECIFIED(&TO_IN6(&peer->local)->sin6_addr)) {
NET_EPOCH_ENTER(et);
ret = in6_selectsrc_addr(curthread->td_proc->p_fibnum,
&TO_IN6(&peer->remote)->sin6_addr,
0, NULL, &TO_IN6(&peer->local)->sin6_addr, NULL);
NET_EPOCH_EXIT(et);
if (ret != 0) {
goto error;
}
}
#endif
OVPN_WLOCK(sc);
/* Disallow peer id re-use. */
if (ovpn_find_peer(sc, peerid) != NULL) {
ret = EEXIST;
goto error_locked;
}
/* Make sure this is really a UDP socket. */
if (so->so_type != SOCK_DGRAM || so->so_proto->pr_type != SOCK_DGRAM) {
ret = EPROTOTYPE;
goto error_locked;
}
/* Must be the same socket as for other peers on this interface. */
if (sc->so != NULL && so != sc->so)
goto error_locked;
if (sc->so == NULL)
sc->so = so;
/* Insert the peer into the list. */
RB_INSERT(ovpn_kpeers, &sc->peers, peer);
sc->peercount++;
soref(sc->so);
ret = udp_set_kernel_tunneling(sc->so, ovpn_udp_input, NULL, sc);
if (ret == EBUSY) {
/* Fine, another peer already set the input function. */
ret = 0;
}
if (ret != 0) {
RB_REMOVE(ovpn_kpeers, &sc->peers, peer);
sc->peercount--;
goto error_locked;
}
OVPN_WUNLOCK(sc);
goto done;
error_locked:
OVPN_WUNLOCK(sc);
error:
free(name, M_SONAME);
COUNTER_ARRAY_FREE(peer->counters, OVPN_PEER_COUNTER_SIZE);
uma_zfree_pcpu(pcpu_zone_4, peer->last_active);
free(peer, M_OVPN);
done:
if (fp != NULL)
fdrop(fp, td);
return (ret);
}
static int
_ovpn_del_peer(struct ovpn_softc *sc, struct ovpn_kpeer *peer)
{
struct ovpn_kpeer *tmp __diagused;
OVPN_WASSERT(sc);
CURVNET_ASSERT_SET();
MPASS(RB_FIND(ovpn_kpeers, &sc->peers, peer) == peer);
tmp = RB_REMOVE(ovpn_kpeers, &sc->peers, peer);
MPASS(tmp != NULL);
sc->peercount--;
ovpn_peer_release_ref(peer, true);
return (0);
}
static int
ovpn_del_peer(struct ifnet *ifp, nvlist_t *nvl)
{
struct ovpn_softc *sc = ifp->if_softc;
struct ovpn_kpeer *peer;
uint32_t peerid;
int ret;
OVPN_WASSERT(sc);
if (nvl == NULL)
return (EINVAL);
if (! nvlist_exists_number(nvl, "peerid"))
return (EINVAL);
peerid = nvlist_get_number(nvl, "peerid");
peer = ovpn_find_peer(sc, peerid);
if (peer == NULL)
return (ENOENT);
peer->del_reason = OVPN_DEL_REASON_REQUESTED;
ret = _ovpn_del_peer(sc, peer);
return (ret);
}
static int
ovpn_create_kkey_dir(struct ovpn_kkey_dir **kdirp,
const nvlist_t *nvl)
{
struct crypto_session_params csp;
struct ovpn_kkey_dir *kdir;
const char *ciphername;
enum ovpn_key_cipher cipher;
const void *key, *iv;
size_t keylen = 0, ivlen = 0;
int error;
if (! nvlist_exists_string(nvl, "cipher"))
return (EINVAL);
ciphername = nvlist_get_string(nvl, "cipher");
if (strcmp(ciphername, "none") == 0)
cipher = OVPN_CIPHER_ALG_NONE;
else if (strcmp(ciphername, "AES-256-GCM") == 0 ||
strcmp(ciphername, "AES-192-GCM") == 0 ||
strcmp(ciphername, "AES-128-GCM") == 0)
cipher = OVPN_CIPHER_ALG_AES_GCM;
else if (strcmp(ciphername, "CHACHA20-POLY1305") == 0)
cipher = OVPN_CIPHER_ALG_CHACHA20_POLY1305;
else
return (EINVAL);
if (cipher != OVPN_CIPHER_ALG_NONE) {
if (! nvlist_exists_binary(nvl, "key"))
return (EINVAL);
key = nvlist_get_binary(nvl, "key", &keylen);
if (keylen > sizeof(kdir->key))
return (E2BIG);
if (! nvlist_exists_binary(nvl, "iv"))
return (EINVAL);
iv = nvlist_get_binary(nvl, "iv", &ivlen);
if (ivlen != 8)
return (E2BIG);
}
kdir = malloc(sizeof(struct ovpn_kkey_dir), M_OVPN,
M_WAITOK | M_ZERO);
kdir->cipher = cipher;
kdir->keylen = keylen;
memcpy(kdir->key, key, keylen);
kdir->noncelen = ivlen;
memcpy(kdir->nonce, iv, ivlen);
if (kdir->cipher != OVPN_CIPHER_ALG_NONE) {
/* Crypto init */
bzero(&csp, sizeof(csp));
csp.csp_mode = CSP_MODE_AEAD;
if (kdir->cipher == OVPN_CIPHER_ALG_CHACHA20_POLY1305)
csp.csp_cipher_alg = CRYPTO_CHACHA20_POLY1305;
else
csp.csp_cipher_alg = CRYPTO_AES_NIST_GCM_16;
csp.csp_flags |= CSP_F_SEPARATE_AAD;
csp.csp_cipher_klen = kdir->keylen;
csp.csp_cipher_key = kdir->key;
csp.csp_ivlen = 96 / 8;
error = crypto_newsession(&kdir->cryptoid, &csp,
CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE);
if (error) {
free(kdir, M_OVPN);
return (error);
}
}
mtx_init(&kdir->replay_mtx, "if_ovpn rx replay", NULL, MTX_DEF);
*kdirp = kdir;
return (0);
}
static void
ovpn_free_kkey_dir(struct ovpn_kkey_dir *kdir)
{
if (kdir == NULL)
return;
mtx_destroy(&kdir->replay_mtx);
crypto_freesession(kdir->cryptoid);
free(kdir, M_OVPN);
}
static int
ovpn_set_key(struct ifnet *ifp, const nvlist_t *nvl)
{
struct ovpn_softc *sc = ifp->if_softc;
struct ovpn_kkey_dir *enc, *dec;
struct ovpn_kpeer *peer;
int slot, keyid, peerid;
int error;
if (nvl == NULL)
return (EINVAL);
if (! nvlist_exists_number(nvl, "slot"))
return (EINVAL);
slot = nvlist_get_number(nvl, "slot");
if (! nvlist_exists_number(nvl, "keyid"))
return (EINVAL);
keyid = nvlist_get_number(nvl, "keyid");
if (! nvlist_exists_number(nvl, "peerid"))
return (EINVAL);
peerid = nvlist_get_number(nvl, "peerid");
if (slot != OVPN_KEY_SLOT_PRIMARY &&
slot != OVPN_KEY_SLOT_SECONDARY)
return (EINVAL);
if (! nvlist_exists_nvlist(nvl, "encrypt") ||
! nvlist_exists_nvlist(nvl, "decrypt"))
return (EINVAL);
error = ovpn_create_kkey_dir(&enc, nvlist_get_nvlist(nvl, "encrypt"));
if (error)
return (error);
error = ovpn_create_kkey_dir(&dec, nvlist_get_nvlist(nvl, "decrypt"));
if (error) {
ovpn_free_kkey_dir(enc);
return (error);
}
OVPN_WLOCK(sc);
peer = ovpn_find_peer(sc, peerid);
if (peer == NULL) {
ovpn_free_kkey_dir(dec);
ovpn_free_kkey_dir(enc);
OVPN_WUNLOCK(sc);
return (ENOENT);
}
ovpn_free_kkey_dir(peer->keys[slot].encrypt);
ovpn_free_kkey_dir(peer->keys[slot].decrypt);
peer->keys[slot].encrypt = enc;
peer->keys[slot].decrypt = dec;
peer->keys[slot].keyid = keyid;
peer->keys[slot].peerid = peerid;
OVPN_WUNLOCK(sc);
return (0);
}
static int
ovpn_check_key(struct ovpn_softc *sc, struct ovpn_kpeer *peer, enum ovpn_key_slot slot)
{
OVPN_ASSERT(sc);
if (peer->keys[slot].encrypt == NULL)
return (ENOLINK);
if (peer->keys[slot].decrypt == NULL)
return (ENOLINK);
return (0);
}
static int
ovpn_start(struct ifnet *ifp)
{
struct ovpn_softc *sc = ifp->if_softc;
OVPN_WLOCK(sc);
ifp->if_flags |= IFF_UP;
ifp->if_drv_flags |= IFF_DRV_RUNNING;
if_link_state_change(ifp, LINK_STATE_UP);
OVPN_WUNLOCK(sc);
return (0);
}
static int
ovpn_swap_keys(struct ifnet *ifp, nvlist_t *nvl)
{
struct ovpn_softc *sc = ifp->if_softc;
struct ovpn_kpeer *peer;
struct ovpn_kkey tmpkey;
int error;
if (nvl == NULL)
return (EINVAL);
if (! nvlist_exists_number(nvl, "peerid"))
return (EINVAL);
OVPN_WLOCK(sc);
peer = ovpn_find_peer(sc, nvlist_get_number(nvl, "peerid"));
if (peer == NULL) {
OVPN_WUNLOCK(sc);
return (ENOENT);
}
/* Check that we have a second key to swap to. */
error = ovpn_check_key(sc, peer, OVPN_KEY_SLOT_SECONDARY);
if (error) {
OVPN_WUNLOCK(sc);
return (error);
}
tmpkey = peer->keys[0];
peer->keys[0] = peer->keys[1];
peer->keys[1] = tmpkey;
OVPN_WUNLOCK(sc);
return (0);
}
static int
ovpn_del_key(struct ifnet *ifp, const nvlist_t *nvl)
{
enum ovpn_key_slot slot;
struct ovpn_kpeer *peer;
struct ovpn_softc *sc = ifp->if_softc;
if (nvl == NULL)
return (EINVAL);
if (! nvlist_exists_number(nvl, "peerid"))
return (EINVAL);
if (! nvlist_exists_number(nvl, "slot"))
return (EINVAL);
slot = nvlist_get_number(nvl, "slot");
if (slot != OVPN_KEY_SLOT_PRIMARY &&
slot != OVPN_KEY_SLOT_SECONDARY)
return (EINVAL);
OVPN_WLOCK(sc);
peer = ovpn_find_peer(sc, nvlist_get_number(nvl, "peerid"));
if (peer == NULL) {
OVPN_WUNLOCK(sc);
return (ENOENT);
}
ovpn_free_kkey_dir(peer->keys[slot].encrypt);
ovpn_free_kkey_dir(peer->keys[slot].decrypt);
peer->keys[slot].encrypt = NULL;
peer->keys[slot].decrypt = NULL;
peer->keys[slot].keyid = 0;
peer->keys[slot].peerid = 0;
OVPN_WUNLOCK(sc);
return (0);
}
static void
ovpn_send_ping(void *arg)
{
static const uint8_t ping_str[] = {
0x2a, 0x18, 0x7b, 0xf3, 0x64, 0x1e, 0xb4, 0xcb,
0x07, 0xed, 0x2d, 0x0a, 0x98, 0x1f, 0xc7, 0x48
};
struct epoch_tracker et;
struct ovpn_kpeer *peer = arg;
struct ovpn_softc *sc = peer->sc;
struct mbuf *m;
OVPN_RASSERT(sc);
/* Ensure we repeat! */
callout_reset(&peer->ping_send, peer->keepalive.interval * hz,
ovpn_send_ping, peer);
m = m_get2(sizeof(ping_str), M_NOWAIT, MT_DATA, M_PKTHDR);
if (m == NULL)
return;
m_copyback(m, 0, sizeof(ping_str), ping_str);
m->m_len = m->m_pkthdr.len = sizeof(ping_str);
CURVNET_SET(sc->ifp->if_vnet);
NET_EPOCH_ENTER(et);
(void)ovpn_transmit_to_peer(sc->ifp, m, peer, NULL);
NET_EPOCH_EXIT(et);
CURVNET_RESTORE();
}
static void
ovpn_timeout(void *arg)
{
struct ovpn_kpeer *peer = arg;
struct ovpn_softc *sc = peer->sc;
uint32_t last, _last_active;
int ret __diagused;
int cpu;
OVPN_WASSERT(sc);
last = 0;
CPU_FOREACH(cpu) {
_last_active = *zpcpu_get_cpu(peer->last_active, cpu);
if (_last_active > last)
last = _last_active;
}
if (last + peer->keepalive.timeout > time_uptime) {
callout_reset(&peer->ping_rcv,
(peer->keepalive.timeout - (time_uptime - last)) * hz,
ovpn_timeout, peer);
return;
}
CURVNET_SET(sc->ifp->if_vnet);
peer->del_reason = OVPN_DEL_REASON_TIMEOUT;
ret = _ovpn_del_peer(sc, peer);
MPASS(ret == 0);
CURVNET_RESTORE();
}
static int
ovpn_set_peer(struct ifnet *ifp, const nvlist_t *nvl)
{
struct ovpn_softc *sc = ifp->if_softc;
struct ovpn_kpeer *peer;
if (nvl == NULL)
return (EINVAL);
if (! nvlist_exists_number(nvl, "interval") ||
! nvlist_exists_number(nvl, "timeout") ||
! nvlist_exists_number(nvl, "peerid"))
return (EINVAL);
OVPN_WLOCK(sc);
peer = ovpn_find_peer(sc, nvlist_get_number(nvl, "peerid"));
if (peer == NULL) {
OVPN_WUNLOCK(sc);
return (ENOENT);
}
peer->keepalive.interval = nvlist_get_number(nvl, "interval");
peer->keepalive.timeout = nvlist_get_number(nvl, "timeout");
if (peer->keepalive.interval > 0)
callout_reset(&peer->ping_send, peer->keepalive.interval * hz,
ovpn_send_ping, peer);
if (peer->keepalive.timeout > 0)
callout_reset(&peer->ping_rcv, peer->keepalive.timeout * hz,
ovpn_timeout, peer);
OVPN_WUNLOCK(sc);
return (0);
}
static int
ovpn_set_ifmode(struct ifnet *ifp, const nvlist_t *nvl)
{
struct ovpn_softc *sc = ifp->if_softc;
int ifmode;
if (nvl == NULL)
return (EINVAL);
if (! nvlist_exists_number(nvl, "ifmode") )
return (EINVAL);
ifmode = nvlist_get_number(nvl, "ifmode");
OVPN_WLOCK(sc);
/* deny this if UP */
if (ifp->if_flags & IFF_UP) {
OVPN_WUNLOCK(sc);
return (EBUSY);
}
switch (ifmode & ~IFF_MULTICAST) {
case IFF_POINTOPOINT:
case IFF_BROADCAST:
ifp->if_flags &=
~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST);
ifp->if_flags |= ifmode;
break;
default:
OVPN_WUNLOCK(sc);
return (EINVAL);
}
OVPN_WUNLOCK(sc);
return (0);
}
static int
ovpn_ioctl_set(struct ifnet *ifp, struct ifdrv *ifd)
{
struct ovpn_softc *sc = ifp->if_softc;
uint8_t *buf = NULL;
nvlist_t *nvl = NULL;
int ret;
if (ifd->ifd_len != 0) {
if (ifd->ifd_len > OVPN_MAX_REQUEST_SIZE)
return (E2BIG);
buf = malloc(ifd->ifd_len, M_OVPN, M_WAITOK);
ret = copyin(ifd->ifd_data, buf, ifd->ifd_len);
if (ret != 0) {
free(buf, M_OVPN);
return (ret);
}
nvl = nvlist_unpack(buf, ifd->ifd_len, 0);
free(buf, M_OVPN);
if (nvl == NULL) {
return (EINVAL);
}
}
switch (ifd->ifd_cmd) {
case OVPN_NEW_PEER:
ret = ovpn_new_peer(ifp, nvl);
break;
case OVPN_DEL_PEER:
OVPN_WLOCK(sc);
ret = ovpn_del_peer(ifp, nvl);
OVPN_WUNLOCK(sc);
break;
case OVPN_NEW_KEY:
ret = ovpn_set_key(ifp, nvl);
break;
case OVPN_START_VPN:
ret = ovpn_start(ifp);
break;
case OVPN_SWAP_KEYS:
ret = ovpn_swap_keys(ifp, nvl);
break;
case OVPN_DEL_KEY:
ret = ovpn_del_key(ifp, nvl);
break;
case OVPN_SET_PEER:
ret = ovpn_set_peer(ifp, nvl);
break;
case OVPN_SET_IFMODE:
ret = ovpn_set_ifmode(ifp, nvl);
break;
default:
ret = ENOTSUP;
}
nvlist_destroy(nvl);
return (ret);
}
static int
ovpn_add_counters(nvlist_t *parent, const char *name, counter_u64_t in,
counter_u64_t out)
{
nvlist_t *nvl;
nvl = nvlist_create(0);
if (nvl == NULL)
return (ENOMEM);
nvlist_add_number(nvl, "in", counter_u64_fetch(in));
nvlist_add_number(nvl, "out", counter_u64_fetch(out));
nvlist_add_nvlist(parent, name, nvl);
nvlist_destroy(nvl);
return (0);
}
static int
ovpn_get_stats(struct ovpn_softc *sc, nvlist_t **onvl)
{
nvlist_t *nvl;
int ret;
nvl = nvlist_create(0);
if (nvl == NULL)
return (ENOMEM);
#define OVPN_COUNTER_OUT(name, in, out) \
do { \
ret = ovpn_add_counters(nvl, name, OVPN_COUNTER(sc, in), \
OVPN_COUNTER(sc, out)); \
if (ret != 0) \
goto error; \
} while(0)
OVPN_COUNTER_OUT("lost_ctrl", lost_ctrl_pkts_in, lost_ctrl_pkts_out);
OVPN_COUNTER_OUT("lost_data", lost_data_pkts_in, lost_data_pkts_out);
OVPN_COUNTER_OUT("nomem_data", nomem_data_pkts_in,
nomem_data_pkts_out);
OVPN_COUNTER_OUT("data", received_data_pkts, sent_data_pkts);
OVPN_COUNTER_OUT("ctrl", received_ctrl_pkts, sent_ctrl_pkts);
OVPN_COUNTER_OUT("tunnel", tunnel_bytes_received,
tunnel_bytes_received);
OVPN_COUNTER_OUT("transport", transport_bytes_received,
transport_bytes_received);
#undef OVPN_COUNTER_OUT
*onvl = nvl;
return (0);
error:
nvlist_destroy(nvl);
return (ret);
}
static int
ovpn_get_peer_stats(struct ovpn_softc *sc, nvlist_t **nvl)
{
struct ovpn_kpeer *peer;
nvlist_t *nvpeer = NULL;
int ret;
OVPN_RLOCK_TRACKER;
*nvl = nvlist_create(0);
if (*nvl == NULL)
return (ENOMEM);
#define OVPN_PEER_COUNTER_OUT(name, in, out) \
do { \
ret = ovpn_add_counters(nvpeer, name, \
OVPN_PEER_COUNTER(peer, in), OVPN_PEER_COUNTER(peer, out)); \
if (ret != 0) \
goto error; \
} while(0)
OVPN_RLOCK(sc);
RB_FOREACH(peer, ovpn_kpeers, &sc->peers) {
nvpeer = nvlist_create(0);
if (nvpeer == NULL) {
OVPN_RUNLOCK(sc);
nvlist_destroy(*nvl);
*nvl = NULL;
return (ENOMEM);
}
nvlist_add_number(nvpeer, "peerid", peer->peerid);
OVPN_PEER_COUNTER_OUT("packets", pkt_in, pkt_out);
OVPN_PEER_COUNTER_OUT("bytes", bytes_in, bytes_out);
nvlist_append_nvlist_array(*nvl, "peers", nvpeer);
nvlist_destroy(nvpeer);
}
#undef OVPN_PEER_COUNTER_OUT
OVPN_RUNLOCK(sc);
return (0);
error:
nvlist_destroy(nvpeer);
nvlist_destroy(*nvl);
*nvl = NULL;
return (ret);
}
static int
ovpn_poll_pkt(struct ovpn_softc *sc, nvlist_t **onvl)
{
nvlist_t *nvl;
nvl = nvlist_create(0);
if (nvl == NULL)
return (ENOMEM);
nvlist_add_number(nvl, "pending", buf_ring_count(sc->notifring));
*onvl = nvl;
return (0);
}
static void
ovpn_notif_add_counters(nvlist_t *parent, struct ovpn_notification *n)
{
nvlist_t *nvl;
nvl = nvlist_create(0);
if (nvl == NULL)
return;
nvlist_add_number(nvl, "in", n->counters.pkt_in);
nvlist_add_number(nvl, "out", n->counters.pkt_out);
nvlist_add_nvlist(parent, "packets", nvl);
nvlist_destroy(nvl);
nvl = nvlist_create(0);
if (nvl == NULL)
return;
nvlist_add_number(nvl, "in", n->counters.bytes_in);
nvlist_add_number(nvl, "out", n->counters.bytes_out);
nvlist_add_nvlist(parent, "bytes", nvl);
nvlist_destroy(nvl);
}
static int
opvn_get_pkt(struct ovpn_softc *sc, nvlist_t **onvl)
{
struct ovpn_notification *n;
nvlist_t *nvl;
/* Check if we have notifications pending. */
n = buf_ring_dequeue_mc(sc->notifring);
if (n == NULL)
return (ENOENT);
nvl = nvlist_create(0);
if (nvl == NULL) {
free(n, M_OVPN);
return (ENOMEM);
}
nvlist_add_number(nvl, "peerid", n->peerid);
nvlist_add_number(nvl, "notification", n->type);
if (n->type == OVPN_NOTIF_DEL_PEER) {
nvlist_add_number(nvl, "del_reason", n->del_reason);
/* No error handling, because we want to send the notification
* even if we can't attach the counters. */
ovpn_notif_add_counters(nvl, n);
}
free(n, M_OVPN);
*onvl = nvl;
return (0);
}
static int
ovpn_ioctl_get(struct ifnet *ifp, struct ifdrv *ifd)
{
struct ovpn_softc *sc = ifp->if_softc;
nvlist_t *nvl = NULL;
int error;
switch (ifd->ifd_cmd) {
case OVPN_GET_STATS:
error = ovpn_get_stats(sc, &nvl);
break;
case OVPN_GET_PEER_STATS:
error = ovpn_get_peer_stats(sc, &nvl);
break;
case OVPN_POLL_PKT:
error = ovpn_poll_pkt(sc, &nvl);
break;
case OVPN_GET_PKT:
error = opvn_get_pkt(sc, &nvl);
break;
default:
error = ENOTSUP;
break;
}
if (error == 0) {
void *packed = NULL;
size_t len;
MPASS(nvl != NULL);
packed = nvlist_pack(nvl, &len);
if (! packed) {
nvlist_destroy(nvl);
return (ENOMEM);
}
if (len > ifd->ifd_len) {
free(packed, M_NVLIST);
nvlist_destroy(nvl);
return (ENOSPC);
}
error = copyout(packed, ifd->ifd_data, len);
ifd->ifd_len = len;
free(packed, M_NVLIST);
nvlist_destroy(nvl);
}
return (error);
}
static int
ovpn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ifdrv *ifd;
int error;
CURVNET_ASSERT_SET();
switch (cmd) {
case SIOCSDRVSPEC:
case SIOCGDRVSPEC:
error = priv_check(curthread, PRIV_NET_OVPN);
if (error)
return (error);
break;
}
switch (cmd) {
case SIOCSDRVSPEC:
ifd = (struct ifdrv *)data;
error = ovpn_ioctl_set(ifp, ifd);
break;
case SIOCGDRVSPEC:
ifd = (struct ifdrv *)data;
error = ovpn_ioctl_get(ifp, ifd);
break;
case SIOCSIFMTU: {
struct ifreq *ifr = (struct ifreq *)data;
if (ifr->ifr_mtu < OVPN_MTU_MIN || ifr->ifr_mtu > OVPN_MTU_MAX)
return (EINVAL);
ifp->if_mtu = ifr->ifr_mtu;
return (0);
}
case SIOCSIFADDR:
case SIOCADDMULTI:
case SIOCDELMULTI:
case SIOCGIFMTU:
case SIOCSIFFLAGS:
return (0);
default:
error = EINVAL;
}
return (error);
}
static int
ovpn_encrypt_tx_cb(struct cryptop *crp)
{
struct epoch_tracker et;
struct ovpn_kpeer *peer = crp->crp_opaque;
struct ovpn_softc *sc = peer->sc;
struct mbuf *m = crp->crp_buf.cb_mbuf;
int tunnel_len;
int ret;
CURVNET_SET(sc->ifp->if_vnet);
NET_EPOCH_ENTER(et);
if (crp->crp_etype != 0) {
crypto_freereq(crp);
ovpn_peer_release_ref(peer, false);
NET_EPOCH_EXIT(et);
CURVNET_RESTORE();
OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
m_freem(m);
return (0);
}
MPASS(crp->crp_buf.cb_type == CRYPTO_BUF_MBUF);
tunnel_len = m->m_pkthdr.len - sizeof(struct ovpn_wire_header);
ret = ovpn_encap(sc, peer->peerid, m);
if (ret == 0) {
OVPN_COUNTER_ADD(sc, sent_data_pkts, 1);
OVPN_COUNTER_ADD(sc, tunnel_bytes_sent, tunnel_len);
}
crypto_freereq(crp);
ovpn_peer_release_ref(peer, false);
NET_EPOCH_EXIT(et);
CURVNET_RESTORE();
return (0);
}
static void
ovpn_finish_rx(struct ovpn_softc *sc, struct mbuf *m,
struct ovpn_kpeer *peer, struct ovpn_kkey *key, uint32_t seq,
struct rm_priotracker *_ovpn_lock_trackerp)
{
uint32_t af;
OVPN_RASSERT(sc);
NET_EPOCH_ASSERT();
/* Replay protection. */
if (V_replay_protection && ! ovpn_check_replay(key->decrypt, seq)) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
m_freem(m);
return;
}
critical_enter();
*zpcpu_get(peer->last_active) = time_uptime;
critical_exit();
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, received_data_pkts, 1);
OVPN_COUNTER_ADD(sc, tunnel_bytes_received, m->m_pkthdr.len);
OVPN_PEER_COUNTER_ADD(peer, pkt_in, 1);
OVPN_PEER_COUNTER_ADD(peer, bytes_in, m->m_pkthdr.len);
/* Receive the packet on our interface. */
m->m_pkthdr.rcvif = sc->ifp;
/* Clear checksum flags in case the real hardware set them. */
m->m_pkthdr.csum_flags = 0;
/* Ensure we can read the first byte. */
m = m_pullup(m, 1);
if (m == NULL) {
OVPN_COUNTER_ADD(sc, nomem_data_pkts_in, 1);
return;
}
/*
* Check for address family, and disregard any control packets (e.g.
* keepalive).
*/
af = ovpn_get_af(m);
if (af != 0) {
BPF_MTAP2(sc->ifp, &af, sizeof(af), m);
if (V_async_netisr_queue)
netisr_queue(af == AF_INET ? NETISR_IP : NETISR_IPV6, m);
else
netisr_dispatch(af == AF_INET ? NETISR_IP : NETISR_IPV6, m);
} else {
OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
m_freem(m);
}
}
static struct ovpn_kkey *
ovpn_find_key(struct ovpn_softc *sc, struct ovpn_kpeer *peer,
const struct ovpn_wire_header *ohdr)
{
struct ovpn_kkey *key = NULL;
uint8_t keyid;
OVPN_RASSERT(sc);
keyid = (ntohl(ohdr->opcode) >> 24) & 0x07;
if (peer->keys[0].keyid == keyid)
key = &peer->keys[0];
else if (peer->keys[1].keyid == keyid)
key = &peer->keys[1];
return (key);
}
static int
ovpn_decrypt_rx_cb(struct cryptop *crp)
{
struct epoch_tracker et;
struct ovpn_softc *sc = crp->crp_opaque;
struct mbuf *m = crp->crp_buf.cb_mbuf;
struct ovpn_kkey *key;
struct ovpn_kpeer *peer;
struct ovpn_wire_header *ohdr;
uint32_t peerid;
OVPN_RLOCK_TRACKER;
OVPN_RLOCK(sc);
MPASS(crp->crp_buf.cb_type == CRYPTO_BUF_MBUF);
if (crp->crp_etype != 0) {
crypto_freereq(crp);
atomic_add_int(&sc->refcount, -1);
OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
OVPN_RUNLOCK(sc);
m_freem(m);
return (0);
}
CURVNET_SET(sc->ifp->if_vnet);
ohdr = mtodo(m, sizeof(struct udphdr));
peerid = ntohl(ohdr->opcode) & 0x00ffffff;
peer = ovpn_find_peer(sc, peerid);
if (peer == NULL) {
/* No such peer. Drop packet. */
crypto_freereq(crp);
atomic_add_int(&sc->refcount, -1);
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
m_freem(m);
CURVNET_RESTORE();
return (0);
}
key = ovpn_find_key(sc, peer, ohdr);
if (key == NULL) {
crypto_freereq(crp);
atomic_add_int(&sc->refcount, -1);
/*
* Has this key been removed between us starting the decrypt
* and finishing it?
*/
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
m_freem(m);
CURVNET_RESTORE();
return (0);
}
/* Now remove the outer headers */
m_adj_decap(m, sizeof(struct udphdr) +
sizeof(struct ovpn_wire_header));
NET_EPOCH_ENTER(et);
ovpn_finish_rx(sc, m, peer, key, ntohl(ohdr->seq), _ovpn_lock_trackerp);
NET_EPOCH_EXIT(et);
OVPN_UNLOCK_ASSERT(sc);
CURVNET_RESTORE();
crypto_freereq(crp);
atomic_add_int(&sc->refcount, -1);
return (0);
}
static int
ovpn_get_af(struct mbuf *m)
{
struct ip *ip;
struct ip6_hdr *ip6;
/*
* We should pullup, but we're only interested in the first byte, so
* that'll always be contiguous.
*/
ip = mtod(m, struct ip *);
if (ip->ip_v == IPVERSION)
return (AF_INET);
ip6 = mtod(m, struct ip6_hdr *);
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION)
return (AF_INET6);
return (0);
}
#ifdef INET
static struct ovpn_kpeer *
ovpn_find_peer_by_ip(struct ovpn_softc *sc, const struct in_addr addr)
{
struct ovpn_kpeer *peer = NULL;
OVPN_ASSERT(sc);
/* TODO: Add a second RB so we can look up by IP. */
RB_FOREACH(peer, ovpn_kpeers, &sc->peers) {
if (addr.s_addr == peer->vpn4.s_addr)
return (peer);
}
return (peer);
}
#endif
#ifdef INET6
static struct ovpn_kpeer *
ovpn_find_peer_by_ip6(struct ovpn_softc *sc, const struct in6_addr *addr)
{
struct ovpn_kpeer *peer = NULL;
OVPN_ASSERT(sc);
/* TODO: Add a third RB so we can look up by IPv6 address. */
RB_FOREACH(peer, ovpn_kpeers, &sc->peers) {
if (memcmp(addr, &peer->vpn6, sizeof(*addr)) == 0)
return (peer);
}
return (peer);
}
#endif
static struct ovpn_kpeer *
ovpn_route_peer(struct ovpn_softc *sc, struct mbuf **m0,
const struct sockaddr *dst)
{
struct ovpn_kpeer *peer = NULL;
int af;
NET_EPOCH_ASSERT();
OVPN_ASSERT(sc);
/* Shortcut if we're a client (or are a server and have only one client). */
if (sc->peercount == 1)
return (ovpn_find_only_peer(sc));
if (dst != NULL)
af = dst->sa_family;
else
af = ovpn_get_af(*m0);
switch (af) {
#ifdef INET
case AF_INET: {
const struct sockaddr_in *sa = (const struct sockaddr_in *)dst;
struct nhop_object *nh;
const struct in_addr *ip_dst;
if (sa != NULL) {
ip_dst = &sa->sin_addr;
} else {
struct ip *ip;
*m0 = m_pullup(*m0, sizeof(struct ip));
if (*m0 == NULL)
return (NULL);
ip = mtod(*m0, struct ip *);
ip_dst = &ip->ip_dst;
}
peer = ovpn_find_peer_by_ip(sc, *ip_dst);
SDT_PROBE2(if_ovpn, tx, route, ip4, ip_dst, peer);
if (peer == NULL) {
nh = fib4_lookup(M_GETFIB(*m0), *ip_dst, 0,
NHR_NONE, 0);
if (nh && (nh->nh_flags & NHF_GATEWAY)) {
peer = ovpn_find_peer_by_ip(sc,
nh->gw4_sa.sin_addr);
SDT_PROBE2(if_ovpn, tx, route, ip4,
&nh->gw4_sa.sin_addr, peer);
}
}
break;
}
#endif
#ifdef INET6
case AF_INET6: {
const struct sockaddr_in6 *sa6 =
(const struct sockaddr_in6 *)dst;
struct nhop_object *nh;
const struct in6_addr *ip6_dst;
if (sa6 != NULL) {
ip6_dst = &sa6->sin6_addr;
} else {
struct ip6_hdr *ip6;
*m0 = m_pullup(*m0, sizeof(struct ip6_hdr));
if (*m0 == NULL)
return (NULL);
ip6 = mtod(*m0, struct ip6_hdr *);
ip6_dst = &ip6->ip6_dst;
}
peer = ovpn_find_peer_by_ip6(sc, ip6_dst);
SDT_PROBE2(if_ovpn, tx, route, ip6, ip6_dst, peer);
if (peer == NULL) {
nh = fib6_lookup(M_GETFIB(*m0), ip6_dst, 0,
NHR_NONE, 0);
if (nh && (nh->nh_flags & NHF_GATEWAY)) {
peer = ovpn_find_peer_by_ip6(sc,
&nh->gw6_sa.sin6_addr);
SDT_PROBE2(if_ovpn, tx, route, ip6,
&nh->gw6_sa.sin6_addr, peer);
}
}
break;
}
#endif
}
return (peer);
}
static int
ovpn_transmit(struct ifnet *ifp, struct mbuf *m)
{
return (ifp->if_output(ifp, m, NULL, NULL));
}
static int
ovpn_transmit_to_peer(struct ifnet *ifp, struct mbuf *m,
struct ovpn_kpeer *peer, struct rm_priotracker *_ovpn_lock_trackerp)
{
struct ovpn_wire_header *ohdr;
struct ovpn_kkey *key;
struct ovpn_softc *sc;
struct cryptop *crp;
uint32_t af, seq;
size_t len, ovpn_hdr_len;
int tunnel_len;
int ret;
sc = ifp->if_softc;
OVPN_RASSERT(sc);
tunnel_len = m->m_pkthdr.len;
key = &peer->keys[OVPN_KEY_SLOT_PRIMARY];
if (key->encrypt == NULL) {
if (_ovpn_lock_trackerp != NULL)
OVPN_RUNLOCK(sc);
m_freem(m);
return (ENOLINK);
}
af = ovpn_get_af(m);
/* Don't capture control packets. */
if (af != 0)
BPF_MTAP2(ifp, &af, sizeof(af), m);
len = m->m_pkthdr.len;
MPASS(len <= ifp->if_mtu);
ovpn_hdr_len = sizeof(struct ovpn_wire_header);
if (key->encrypt->cipher == OVPN_CIPHER_ALG_NONE)
ovpn_hdr_len -= 16; /* No auth tag. */
M_PREPEND(m, ovpn_hdr_len, M_NOWAIT);
if (m == NULL) {
if (_ovpn_lock_trackerp != NULL)
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
return (ENOBUFS);
}
ohdr = mtod(m, struct ovpn_wire_header *);
ohdr->opcode = (OVPN_OP_DATA_V2 << OVPN_OP_SHIFT) | key->keyid;
ohdr->opcode <<= 24;
ohdr->opcode |= key->peerid;
ohdr->opcode = htonl(ohdr->opcode);
seq = atomic_fetchadd_32(&peer->tx_seq, 1);
seq = htonl(seq);
ohdr->seq = seq;
OVPN_PEER_COUNTER_ADD(peer, pkt_out, 1);
OVPN_PEER_COUNTER_ADD(peer, bytes_out, len);
if (key->encrypt->cipher == OVPN_CIPHER_ALG_NONE) {
ret = ovpn_encap(sc, peer->peerid, m);
if (_ovpn_lock_trackerp != NULL)
OVPN_RUNLOCK(sc);
if (ret == 0) {
OVPN_COUNTER_ADD(sc, sent_data_pkts, 1);
OVPN_COUNTER_ADD(sc, tunnel_bytes_sent, tunnel_len);
}
return (ret);
}
crp = crypto_getreq(key->encrypt->cryptoid, M_NOWAIT);
if (crp == NULL) {
if (_ovpn_lock_trackerp != NULL)
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
m_freem(m);
return (ENOBUFS);
}
/* Encryption covers only the payload, not the header. */
crp->crp_payload_start = sizeof(*ohdr);
crp->crp_payload_length = len;
crp->crp_op = CRYPTO_OP_ENCRYPT;
/*
* AAD data covers the ovpn_wire_header minus the auth
* tag.
*/
crp->crp_aad_length = sizeof(*ohdr) - sizeof(ohdr->auth_tag);
crp->crp_aad = ohdr;
crp->crp_aad_start = 0;
crp->crp_op |= CRYPTO_OP_COMPUTE_DIGEST;
crp->crp_digest_start = offsetof(struct ovpn_wire_header, auth_tag);
crp->crp_flags |= CRYPTO_F_IV_SEPARATE;
memcpy(crp->crp_iv, &seq, sizeof(seq));
memcpy(crp->crp_iv + sizeof(seq), key->encrypt->nonce,
key->encrypt->noncelen);
crypto_use_mbuf(crp, m);
crp->crp_flags |= CRYPTO_F_CBIFSYNC;
crp->crp_callback = ovpn_encrypt_tx_cb;
crp->crp_opaque = peer;
atomic_add_int(&peer->refcount, 1);
if (_ovpn_lock_trackerp != NULL)
OVPN_RUNLOCK(sc);
if (V_async_crypto)
ret = crypto_dispatch_async(crp, CRYPTO_ASYNC_ORDERED);
else
ret = crypto_dispatch(crp);
if (ret) {
OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
}
return (ret);
}
/*
* Note: Expects to hold the read lock on entry, and will release it itself.
*/
static int
ovpn_encap(struct ovpn_softc *sc, uint32_t peerid, struct mbuf *m)
{
struct udphdr *udp;
struct ovpn_kpeer *peer;
int len;
OVPN_RLOCK_TRACKER;
OVPN_RLOCK(sc);
NET_EPOCH_ASSERT();
peer = ovpn_find_peer(sc, peerid);
if (peer == NULL || sc->ifp->if_link_state != LINK_STATE_UP) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
m_freem(m);
return (ENETDOWN);
}
len = m->m_pkthdr.len;
M_PREPEND(m, sizeof(struct udphdr), M_NOWAIT);
if (m == NULL) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
m_freem(m);
return (ENOBUFS);
}
udp = mtod(m, struct udphdr *);
MPASS(peer->local.ss_family == peer->remote.ss_family);
udp->uh_sport = ovpn_get_port(&peer->local);
udp->uh_dport = ovpn_get_port(&peer->remote);
udp->uh_ulen = htons(sizeof(struct udphdr) + len);
switch (peer->remote.ss_family) {
#ifdef INET
case AF_INET: {
struct sockaddr_in *in_local = TO_IN(&peer->local);
struct sockaddr_in *in_remote = TO_IN(&peer->remote);
struct ip *ip;
/*
* This requires knowing the source IP, which we don't. Happily
* we're allowed to keep this at 0, and the checksum won't do
* anything the crypto won't already do.
*/
udp->uh_sum = 0;
/* Set the checksum flags so we recalculate checksums. */
m->m_pkthdr.csum_flags |= CSUM_IP;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
if (m == NULL) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
return (ENOBUFS);
}
ip = mtod(m, struct ip *);
ip->ip_tos = 0;
ip->ip_len = htons(sizeof(struct ip) + sizeof(struct udphdr) +
len);
ip->ip_off = 0;
ip->ip_ttl = V_ip_defttl;
ip->ip_p = IPPROTO_UDP;
ip->ip_sum = 0;
if (in_local->sin_port != 0)
ip->ip_src = in_local->sin_addr;
else
ip->ip_src.s_addr = INADDR_ANY;
ip->ip_dst = in_remote->sin_addr;
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, transport_bytes_sent, m->m_pkthdr.len);
return (ip_output(m, NULL, NULL, 0, NULL, NULL));
}
#endif
#ifdef INET6
case AF_INET6: {
struct sockaddr_in6 *in6_local = TO_IN6(&peer->local);
struct sockaddr_in6 *in6_remote = TO_IN6(&peer->remote);
struct ip6_hdr *ip6;
M_PREPEND(m, sizeof(struct ip6_hdr), M_NOWAIT);
if (m == NULL) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
return (ENOBUFS);
}
m = m_pullup(m, sizeof(*ip6) + sizeof(*udp));
if (m == NULL) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, nomem_data_pkts_out, 1);
return (ENOBUFS);
}
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_vfc = IPV6_VERSION;
ip6->ip6_flow &= ~IPV6_FLOWINFO_MASK;
ip6->ip6_plen = htons(sizeof(*ip6) + sizeof(struct udphdr) +
len);
ip6->ip6_nxt = IPPROTO_UDP;
ip6->ip6_hlim = V_ip6_defhlim;
memcpy(&ip6->ip6_src, &in6_local->sin6_addr,
sizeof(ip6->ip6_src));
memcpy(&ip6->ip6_dst, &in6_remote->sin6_addr,
sizeof(ip6->ip6_dst));
udp = mtodo(m, sizeof(*ip6));
udp->uh_sum = in6_cksum_pseudo(ip6,
m->m_pkthdr.len - sizeof(struct ip6_hdr),
IPPROTO_UDP, 0);
m->m_pkthdr.csum_flags |= CSUM_UDP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, transport_bytes_sent, m->m_pkthdr.len);
return (ip6_output(m, NULL, NULL, IPV6_UNSPECSRC, NULL, NULL,
NULL));
}
#endif
default:
panic("Unsupported address family %d",
peer->remote.ss_family);
}
}
static int
ovpn_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
struct route *ro)
{
struct ovpn_softc *sc;
struct ovpn_kpeer *peer;
OVPN_RLOCK_TRACKER;
sc = ifp->if_softc;
OVPN_RLOCK(sc);
SDT_PROBE1(if_ovpn, tx, transmit, start, m);
if (__predict_false(ifp->if_link_state != LINK_STATE_UP)) {
OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
OVPN_RUNLOCK(sc);
m_freem(m);
return (ENETDOWN);
}
/**
* Only obey 'dst' (i.e. the gateway) if no route is supplied.
* That's our indication that we're being called through pf's route-to,
* and we should route according to 'dst' instead. We can't do so
* consistently, because the usual openvpn configuration sets the first
* non-server IP in the subnet as the gateway. If we always use that
* one we'd end up routing all traffic to the first client.
* tl;dr: 'ro == NULL' tells us pf is doing a route-to, and then but
* only then, we should treat 'dst' as the destination. */
peer = ovpn_route_peer(sc, &m, ro == NULL ? dst : NULL);
if (peer == NULL) {
/* No destination. */
OVPN_COUNTER_ADD(sc, lost_data_pkts_out, 1);
OVPN_RUNLOCK(sc);
m_freem(m);
return (ENETDOWN);
}
return (ovpn_transmit_to_peer(ifp, m, peer, _ovpn_lock_trackerp));
}
static bool
ovpn_check_replay(struct ovpn_kkey_dir *key, uint32_t seq)
{
uint32_t d;
mtx_lock(&key->replay_mtx);
/* Sequence number must be strictly greater than rx_seq */
if (seq <= key->rx_seq) {
mtx_unlock(&key->replay_mtx);
return (false);
}
/* Large jump. The packet authenticated okay, so just accept that. */
if (seq > (key->rx_seq + (sizeof(key->rx_window) * 8))) {
key->rx_seq = seq;
key->rx_window = 0;
mtx_unlock(&key->replay_mtx);
return (true);
}
/* Happy case. */
if ((seq == key->rx_seq + 1) && key->rx_window == 0) {
key->rx_seq++;
mtx_unlock(&key->replay_mtx);
return (true);
}
d = seq - key->rx_seq - 1;
if (key->rx_window & ((uint64_t)1 << d)) {
/* Dupe! */
mtx_unlock(&key->replay_mtx);
return (false);
}
key->rx_window |= (uint64_t)1 << d;
while (key->rx_window & 1) {
key->rx_seq++;
key->rx_window >>= 1;
}
mtx_unlock(&key->replay_mtx);
return (true);
}
static struct ovpn_kpeer *
ovpn_peer_from_mbuf(struct ovpn_softc *sc, struct mbuf *m, int off)
{
struct ovpn_wire_header ohdr;
uint32_t peerid;
const size_t hdrlen = sizeof(ohdr) - sizeof(ohdr.auth_tag);
OVPN_RASSERT(sc);
if (m_length(m, NULL) < (off + sizeof(struct udphdr) + hdrlen))
return (NULL);
m_copydata(m, off + sizeof(struct udphdr), hdrlen, (caddr_t)&ohdr);
peerid = ntohl(ohdr.opcode) & 0x00ffffff;
return (ovpn_find_peer(sc, peerid));
}
static bool
ovpn_udp_input(struct mbuf *m, int off, struct inpcb *inp,
const struct sockaddr *sa, void *ctx)
{
struct ovpn_softc *sc = ctx;
struct ovpn_wire_header tmphdr;
struct ovpn_wire_header *ohdr;
struct udphdr *uhdr;
struct ovpn_kkey *key;
struct cryptop *crp;
struct ovpn_kpeer *peer;
size_t ohdrlen;
int ret;
uint8_t op;
OVPN_RLOCK_TRACKER;
M_ASSERTPKTHDR(m);
OVPN_COUNTER_ADD(sc, transport_bytes_received, m->m_pkthdr.len - off);
ohdrlen = sizeof(*ohdr) - sizeof(ohdr->auth_tag);
OVPN_RLOCK(sc);
peer = ovpn_peer_from_mbuf(sc, m, off);
if (peer == NULL) {
OVPN_RUNLOCK(sc);
return (false);
}
if (m_length(m, NULL) < (off + sizeof(*uhdr) + ohdrlen)) {
/* Short packet. */
OVPN_RUNLOCK(sc);
return (false);
}
m_copydata(m, off + sizeof(*uhdr), ohdrlen, (caddr_t)&tmphdr);
op = ntohl(tmphdr.opcode) >> 24 >> OVPN_OP_SHIFT;
if (op != OVPN_OP_DATA_V2) {
/* Control packet? */
OVPN_RUNLOCK(sc);
return (false);
}
m = m_pullup(m, off + sizeof(*uhdr) + ohdrlen);
if (m == NULL) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, nomem_data_pkts_in, 1);
return (true);
}
/*
* Simplify things by getting rid of the preceding headers, we don't
* care about them.
*/
m_adj_decap(m, off);
uhdr = mtodo(m, 0);
ohdr = mtodo(m, sizeof(*uhdr));
key = ovpn_find_key(sc, peer, ohdr);
if (key == NULL || key->decrypt == NULL) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
m_freem(m);
return (true);
}
if (key->decrypt->cipher == OVPN_CIPHER_ALG_NONE) {
/* Now remove the outer headers */
m_adj_decap(m, sizeof(struct udphdr) + ohdrlen);
ohdr = mtodo(m, sizeof(*uhdr));
ovpn_finish_rx(sc, m, peer, key, ntohl(ohdr->seq),
_ovpn_lock_trackerp);
OVPN_UNLOCK_ASSERT(sc);
return (true);
}
ohdrlen += sizeof(ohdr->auth_tag);
m = m_pullup(m, sizeof(*uhdr) + ohdrlen);
if (m == NULL) {
OVPN_RUNLOCK(sc);
OVPN_COUNTER_ADD(sc, nomem_data_pkts_in, 1);
return (true);
}
uhdr = mtodo(m, 0);
ohdr = mtodo(m, sizeof(*uhdr));
/* Decrypt */
crp = crypto_getreq(key->decrypt->cryptoid, M_NOWAIT);
if (crp == NULL) {
OVPN_COUNTER_ADD(sc, nomem_data_pkts_in, 1);
OVPN_RUNLOCK(sc);
m_freem(m);
return (true);
}
crp->crp_payload_start = sizeof(struct udphdr) + sizeof(*ohdr);
crp->crp_payload_length = ntohs(uhdr->uh_ulen) -
sizeof(*uhdr) - sizeof(*ohdr);
crp->crp_op = CRYPTO_OP_DECRYPT;
/* AAD validation. */
crp->crp_aad_length = sizeof(*ohdr) - sizeof(ohdr->auth_tag);
crp->crp_aad = ohdr;
crp->crp_aad_start = 0;
crp->crp_op |= CRYPTO_OP_VERIFY_DIGEST;
crp->crp_digest_start = sizeof(struct udphdr) +
offsetof(struct ovpn_wire_header, auth_tag);
crp->crp_flags |= CRYPTO_F_IV_SEPARATE;
memcpy(crp->crp_iv, &ohdr->seq, sizeof(ohdr->seq));
memcpy(crp->crp_iv + sizeof(ohdr->seq), key->decrypt->nonce,
key->decrypt->noncelen);
crypto_use_mbuf(crp, m);
crp->crp_flags |= CRYPTO_F_CBIFSYNC;
crp->crp_callback = ovpn_decrypt_rx_cb;
crp->crp_opaque = sc;
atomic_add_int(&sc->refcount, 1);
OVPN_RUNLOCK(sc);
if (V_async_crypto)
ret = crypto_dispatch_async(crp, CRYPTO_ASYNC_ORDERED);
else
ret = crypto_dispatch(crp);
if (ret != 0) {
OVPN_COUNTER_ADD(sc, lost_data_pkts_in, 1);
}
return (true);
}
static void
ovpn_qflush(struct ifnet *ifp __unused)
{
}
static void
ovpn_flush_rxring(struct ovpn_softc *sc)
{
struct ovpn_notification *n;
OVPN_WASSERT(sc);
while (! buf_ring_empty(sc->notifring)) {
n = buf_ring_dequeue_sc(sc->notifring);
free(n, M_OVPN);
}
}
#ifdef VIMAGE
static void
ovpn_reassign(struct ifnet *ifp, struct vnet *new_vnet __unused,
char *unused __unused)
{
struct ovpn_softc *sc = ifp->if_softc;
struct ovpn_kpeer *peer, *tmppeer;
int ret __diagused;
OVPN_WLOCK(sc);
/* Flush keys & configuration. */
RB_FOREACH_SAFE(peer, ovpn_kpeers, &sc->peers, tmppeer) {
peer->del_reason = OVPN_DEL_REASON_REQUESTED;
ret = _ovpn_del_peer(sc, peer);
MPASS(ret == 0);
}
ovpn_flush_rxring(sc);
OVPN_WUNLOCK(sc);
}
#endif
static int
ovpn_clone_match(struct if_clone *ifc, const char *name)
{
/*
* Allow all names that start with 'ovpn', specifically because pfSense
* uses ovpnc1 / ovpns2
*/
return (strncmp(ovpnname, name, strlen(ovpnname)) == 0);
}
static int
ovpn_clone_create(struct if_clone *ifc, char *name, size_t len,
struct ifc_data *ifd, struct ifnet **ifpp)
{
struct ovpn_softc *sc;
struct ifnet *ifp;
char *dp;
int error, unit, wildcard;
/* Try to see if a special unit was requested. */
error = ifc_name2unit(name, &unit);
if (error != 0)
return (error);
wildcard = (unit < 0);
error = ifc_alloc_unit(ifc, &unit);
if (error != 0)
return (error);
/*
* If no unit had been given, we need to adjust the ifName.
*/
for (dp = name; *dp != '\0'; dp++);
if (wildcard) {
error = snprintf(dp, len - (dp - name), "%d", unit);
if (error > len - (dp - name)) {
/* ifName too long. */
ifc_free_unit(ifc, unit);
return (ENOSPC);
}
dp += error;
}
/* Make sure it doesn't already exist. */
if (ifunit(name) != NULL)
return (EEXIST);
sc = malloc(sizeof(struct ovpn_softc), M_OVPN, M_WAITOK | M_ZERO);
sc->ifp = if_alloc(IFT_ENC);
rm_init_flags(&sc->lock, "if_ovpn_lock", RM_RECURSE);
sc->refcount = 0;
sc->notifring = buf_ring_alloc(32, M_OVPN, M_WAITOK, NULL);
COUNTER_ARRAY_ALLOC(sc->counters, OVPN_COUNTER_SIZE, M_WAITOK);
ifp = sc->ifp;
ifp->if_softc = sc;
strlcpy(ifp->if_xname, name, IFNAMSIZ);
ifp->if_dname = ovpngroupname;
ifp->if_dunit = unit;
ifp->if_addrlen = 0;
ifp->if_mtu = 1428;
ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
ifp->if_ioctl = ovpn_ioctl;
ifp->if_transmit = ovpn_transmit;
ifp->if_output = ovpn_output;
ifp->if_qflush = ovpn_qflush;
#ifdef VIMAGE
ifp->if_reassign = ovpn_reassign;
#endif
ifp->if_capabilities |= IFCAP_LINKSTATE;
ifp->if_capenable |= IFCAP_LINKSTATE;
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(uint32_t));
*ifpp = ifp;
return (0);
}
static void
ovpn_clone_destroy_cb(struct epoch_context *ctx)
{
struct ovpn_softc *sc;
sc = __containerof(ctx, struct ovpn_softc, epoch_ctx);
MPASS(sc->peercount == 0);
MPASS(RB_EMPTY(&sc->peers));
COUNTER_ARRAY_FREE(sc->counters, OVPN_COUNTER_SIZE);
if_free(sc->ifp);
free(sc, M_OVPN);
}
static int
ovpn_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
{
struct ovpn_softc *sc;
struct ovpn_kpeer *peer, *tmppeer;
int unit;
int ret __diagused;
sc = ifp->if_softc;
unit = ifp->if_dunit;
OVPN_WLOCK(sc);
if (atomic_load_int(&sc->refcount) > 0) {
OVPN_WUNLOCK(sc);
return (EBUSY);
}
RB_FOREACH_SAFE(peer, ovpn_kpeers, &sc->peers, tmppeer) {
peer->del_reason = OVPN_DEL_REASON_REQUESTED;
ret = _ovpn_del_peer(sc, peer);
MPASS(ret == 0);
}
ovpn_flush_rxring(sc);
buf_ring_free(sc->notifring, M_OVPN);
OVPN_WUNLOCK(sc);
bpfdetach(ifp);
if_detach(ifp);
ifp->if_softc = NULL;
NET_EPOCH_CALL(ovpn_clone_destroy_cb, &sc->epoch_ctx);
if (unit != IF_DUNIT_NONE)
ifc_free_unit(ifc, unit);
NET_EPOCH_DRAIN_CALLBACKS();
return (0);
}
static void
vnet_ovpn_init(const void *unused __unused)
{
struct if_clone_addreq req = {
.match_f = ovpn_clone_match,
.create_f = ovpn_clone_create,
.destroy_f = ovpn_clone_destroy,
};
V_ovpn_cloner = ifc_attach_cloner(ovpngroupname, &req);
}
VNET_SYSINIT(vnet_ovpn_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
vnet_ovpn_init, NULL);
static void
vnet_ovpn_uninit(const void *unused __unused)
{
if_clone_detach(V_ovpn_cloner);
}
VNET_SYSUNINIT(vnet_ovpn_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
vnet_ovpn_uninit, NULL);
static int
ovpnmodevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
/* Done in vnet_ovpn_init() */
break;
case MOD_UNLOAD:
/* Done in vnet_ovpn_uninit() */
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t ovpn_mod = {
"if_ovpn",
ovpnmodevent,
0
};
DECLARE_MODULE(if_ovpn, ovpn_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(if_ovpn, 1);
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