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freebsd-skq/sys/net/if_vxlan.c
Pawel Biernacki 7029da5c36 Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) 
r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are
still not MPSAFE (or already are but aren’t properly marked).
Use it in preparation for a general review of all nodes.

This is non-functional change that adds annotations to SYSCTL_NODE and
SYSCTL_PROC nodes using one of the soon-to-be-required flags.

Mark all obvious cases as MPSAFE.  All entries that haven't been marked
as MPSAFE before are by default marked as NEEDGIANT

Approved by:	kib (mentor, blanket)
Commented by:	kib, gallatin, melifaro
Differential Revision:	https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00

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/*-
* Copyright (c) 2014, Bryan Venteicher <bryanv@FreeBSD.org>
* All rights reserved.
*
* 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 unmodified, 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 ``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 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/hash.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/refcount.h>
#include <sys/rmlock.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_clone.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_vxlan.h>
#include <net/netisr.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/in_pcb.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/scope6_var.h>
struct vxlan_softc;
LIST_HEAD(vxlan_softc_head, vxlan_softc);
struct vxlan_socket_mc_info {
union vxlan_sockaddr vxlsomc_saddr;
union vxlan_sockaddr vxlsomc_gaddr;
int vxlsomc_ifidx;
int vxlsomc_users;
};
/*
* The maximum MTU of encapsulated ethernet frame within IPv4/UDP packet.
*/
#define VXLAN_MAX_MTU (IP_MAXPACKET - \
60 /* Maximum IPv4 header len */ - \
sizeof(struct udphdr) - \
sizeof(struct vxlan_header) - \
ETHER_HDR_LEN - ETHER_CRC_LEN - ETHER_VLAN_ENCAP_LEN)
#define VXLAN_SO_MC_MAX_GROUPS 32
#define VXLAN_SO_VNI_HASH_SHIFT 6
#define VXLAN_SO_VNI_HASH_SIZE (1 << VXLAN_SO_VNI_HASH_SHIFT)
#define VXLAN_SO_VNI_HASH(_vni) ((_vni) % VXLAN_SO_VNI_HASH_SIZE)
struct vxlan_socket {
struct socket *vxlso_sock;
struct rmlock vxlso_lock;
u_int vxlso_refcnt;
union vxlan_sockaddr vxlso_laddr;
LIST_ENTRY(vxlan_socket) vxlso_entry;
struct vxlan_softc_head vxlso_vni_hash[VXLAN_SO_VNI_HASH_SIZE];
struct vxlan_socket_mc_info vxlso_mc[VXLAN_SO_MC_MAX_GROUPS];
};
#define VXLAN_SO_RLOCK(_vso, _p) rm_rlock(&(_vso)->vxlso_lock, (_p))
#define VXLAN_SO_RUNLOCK(_vso, _p) rm_runlock(&(_vso)->vxlso_lock, (_p))
#define VXLAN_SO_WLOCK(_vso) rm_wlock(&(_vso)->vxlso_lock)
#define VXLAN_SO_WUNLOCK(_vso) rm_wunlock(&(_vso)->vxlso_lock)
#define VXLAN_SO_LOCK_ASSERT(_vso) \
rm_assert(&(_vso)->vxlso_lock, RA_LOCKED)
#define VXLAN_SO_LOCK_WASSERT(_vso) \
rm_assert(&(_vso)->vxlso_lock, RA_WLOCKED)
#define VXLAN_SO_ACQUIRE(_vso) refcount_acquire(&(_vso)->vxlso_refcnt)
#define VXLAN_SO_RELEASE(_vso) refcount_release(&(_vso)->vxlso_refcnt)
struct vxlan_ftable_entry {
LIST_ENTRY(vxlan_ftable_entry) vxlfe_hash;
uint16_t vxlfe_flags;
uint8_t vxlfe_mac[ETHER_ADDR_LEN];
union vxlan_sockaddr vxlfe_raddr;
time_t vxlfe_expire;
};
#define VXLAN_FE_FLAG_DYNAMIC 0x01
#define VXLAN_FE_FLAG_STATIC 0x02
#define VXLAN_FE_IS_DYNAMIC(_fe) \
((_fe)->vxlfe_flags & VXLAN_FE_FLAG_DYNAMIC)
#define VXLAN_SC_FTABLE_SHIFT 9
#define VXLAN_SC_FTABLE_SIZE (1 << VXLAN_SC_FTABLE_SHIFT)
#define VXLAN_SC_FTABLE_MASK (VXLAN_SC_FTABLE_SIZE - 1)
#define VXLAN_SC_FTABLE_HASH(_sc, _mac) \
(vxlan_mac_hash(_sc, _mac) % VXLAN_SC_FTABLE_SIZE)
LIST_HEAD(vxlan_ftable_head, vxlan_ftable_entry);
struct vxlan_statistics {
uint32_t ftable_nospace;
uint32_t ftable_lock_upgrade_failed;
};
struct vxlan_softc {
struct ifnet *vxl_ifp;
struct vxlan_socket *vxl_sock;
uint32_t vxl_vni;
union vxlan_sockaddr vxl_src_addr;
union vxlan_sockaddr vxl_dst_addr;
uint32_t vxl_flags;
#define VXLAN_FLAG_INIT 0x0001
#define VXLAN_FLAG_TEARDOWN 0x0002
#define VXLAN_FLAG_LEARN 0x0004
uint32_t vxl_port_hash_key;
uint16_t vxl_min_port;
uint16_t vxl_max_port;
uint8_t vxl_ttl;
/* Lookup table from MAC address to forwarding entry. */
uint32_t vxl_ftable_cnt;
uint32_t vxl_ftable_max;
uint32_t vxl_ftable_timeout;
uint32_t vxl_ftable_hash_key;
struct vxlan_ftable_head *vxl_ftable;
/* Derived from vxl_dst_addr. */
struct vxlan_ftable_entry vxl_default_fe;
struct ip_moptions *vxl_im4o;
struct ip6_moptions *vxl_im6o;
struct rmlock vxl_lock;
volatile u_int vxl_refcnt;
int vxl_unit;
int vxl_vso_mc_index;
struct vxlan_statistics vxl_stats;
struct sysctl_oid *vxl_sysctl_node;
struct sysctl_ctx_list vxl_sysctl_ctx;
struct callout vxl_callout;
struct ether_addr vxl_hwaddr;
int vxl_mc_ifindex;
struct ifnet *vxl_mc_ifp;
struct ifmedia vxl_media;
char vxl_mc_ifname[IFNAMSIZ];
LIST_ENTRY(vxlan_softc) vxl_entry;
LIST_ENTRY(vxlan_softc) vxl_ifdetach_list;
};
#define VXLAN_RLOCK(_sc, _p) rm_rlock(&(_sc)->vxl_lock, (_p))
#define VXLAN_RUNLOCK(_sc, _p) rm_runlock(&(_sc)->vxl_lock, (_p))
#define VXLAN_WLOCK(_sc) rm_wlock(&(_sc)->vxl_lock)
#define VXLAN_WUNLOCK(_sc) rm_wunlock(&(_sc)->vxl_lock)
#define VXLAN_LOCK_WOWNED(_sc) rm_wowned(&(_sc)->vxl_lock)
#define VXLAN_LOCK_ASSERT(_sc) rm_assert(&(_sc)->vxl_lock, RA_LOCKED)
#define VXLAN_LOCK_WASSERT(_sc) rm_assert(&(_sc)->vxl_lock, RA_WLOCKED)
#define VXLAN_UNLOCK(_sc, _p) do { \
if (VXLAN_LOCK_WOWNED(_sc)) \
VXLAN_WUNLOCK(_sc); \
else \
VXLAN_RUNLOCK(_sc, _p); \
} while (0)
#define VXLAN_ACQUIRE(_sc) refcount_acquire(&(_sc)->vxl_refcnt)
#define VXLAN_RELEASE(_sc) refcount_release(&(_sc)->vxl_refcnt)
#define satoconstsin(sa) ((const struct sockaddr_in *)(sa))
#define satoconstsin6(sa) ((const struct sockaddr_in6 *)(sa))
struct vxlanudphdr {
struct udphdr vxlh_udp;
struct vxlan_header vxlh_hdr;
} __packed;
static int vxlan_ftable_addr_cmp(const uint8_t *, const uint8_t *);
static void vxlan_ftable_init(struct vxlan_softc *);
static void vxlan_ftable_fini(struct vxlan_softc *);
static void vxlan_ftable_flush(struct vxlan_softc *, int);
static void vxlan_ftable_expire(struct vxlan_softc *);
static int vxlan_ftable_update_locked(struct vxlan_softc *,
const union vxlan_sockaddr *, const uint8_t *,
struct rm_priotracker *);
static int vxlan_ftable_learn(struct vxlan_softc *,
const struct sockaddr *, const uint8_t *);
static int vxlan_ftable_sysctl_dump(SYSCTL_HANDLER_ARGS);
static struct vxlan_ftable_entry *
vxlan_ftable_entry_alloc(void);
static void vxlan_ftable_entry_free(struct vxlan_ftable_entry *);
static void vxlan_ftable_entry_init(struct vxlan_softc *,
struct vxlan_ftable_entry *, const uint8_t *,
const struct sockaddr *, uint32_t);
static void vxlan_ftable_entry_destroy(struct vxlan_softc *,
struct vxlan_ftable_entry *);
static int vxlan_ftable_entry_insert(struct vxlan_softc *,
struct vxlan_ftable_entry *);
static struct vxlan_ftable_entry *
vxlan_ftable_entry_lookup(struct vxlan_softc *,
const uint8_t *);
static void vxlan_ftable_entry_dump(struct vxlan_ftable_entry *,
struct sbuf *);
static struct vxlan_socket *
vxlan_socket_alloc(const union vxlan_sockaddr *);
static void vxlan_socket_destroy(struct vxlan_socket *);
static void vxlan_socket_release(struct vxlan_socket *);
static struct vxlan_socket *
vxlan_socket_lookup(union vxlan_sockaddr *vxlsa);
static void vxlan_socket_insert(struct vxlan_socket *);
static int vxlan_socket_init(struct vxlan_socket *, struct ifnet *);
static int vxlan_socket_bind(struct vxlan_socket *, struct ifnet *);
static int vxlan_socket_create(struct ifnet *, int,
const union vxlan_sockaddr *, struct vxlan_socket **);
static void vxlan_socket_ifdetach(struct vxlan_socket *,
struct ifnet *, struct vxlan_softc_head *);
static struct vxlan_socket *
vxlan_socket_mc_lookup(const union vxlan_sockaddr *);
static int vxlan_sockaddr_mc_info_match(
const struct vxlan_socket_mc_info *,
const union vxlan_sockaddr *,
const union vxlan_sockaddr *, int);
static int vxlan_socket_mc_join_group(struct vxlan_socket *,
const union vxlan_sockaddr *, const union vxlan_sockaddr *,
int *, union vxlan_sockaddr *);
static int vxlan_socket_mc_leave_group(struct vxlan_socket *,
const union vxlan_sockaddr *,
const union vxlan_sockaddr *, int);
static int vxlan_socket_mc_add_group(struct vxlan_socket *,
const union vxlan_sockaddr *, const union vxlan_sockaddr *,
int, int *);
static void vxlan_socket_mc_release_group_by_idx(struct vxlan_socket *,
int);
static struct vxlan_softc *
vxlan_socket_lookup_softc_locked(struct vxlan_socket *,
uint32_t);
static struct vxlan_softc *
vxlan_socket_lookup_softc(struct vxlan_socket *, uint32_t);
static int vxlan_socket_insert_softc(struct vxlan_socket *,
struct vxlan_softc *);
static void vxlan_socket_remove_softc(struct vxlan_socket *,
struct vxlan_softc *);
static struct ifnet *
vxlan_multicast_if_ref(struct vxlan_softc *, int);
static void vxlan_free_multicast(struct vxlan_softc *);
static int vxlan_setup_multicast_interface(struct vxlan_softc *);
static int vxlan_setup_multicast(struct vxlan_softc *);
static int vxlan_setup_socket(struct vxlan_softc *);
static void vxlan_setup_interface(struct vxlan_softc *);
static int vxlan_valid_init_config(struct vxlan_softc *);
static void vxlan_init_wait(struct vxlan_softc *);
static void vxlan_init_complete(struct vxlan_softc *);
static void vxlan_init(void *);
static void vxlan_release(struct vxlan_softc *);
static void vxlan_teardown_wait(struct vxlan_softc *);
static void vxlan_teardown_complete(struct vxlan_softc *);
static void vxlan_teardown_locked(struct vxlan_softc *);
static void vxlan_teardown(struct vxlan_softc *);
static void vxlan_ifdetach(struct vxlan_softc *, struct ifnet *,
struct vxlan_softc_head *);
static void vxlan_timer(void *);
static int vxlan_ctrl_get_config(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_vni(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_local_addr(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_remote_addr(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_local_port(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_remote_port(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_port_range(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_ftable_timeout(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_ftable_max(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_multicast_if(struct vxlan_softc * , void *);
static int vxlan_ctrl_set_ttl(struct vxlan_softc *, void *);
static int vxlan_ctrl_set_learn(struct vxlan_softc *, void *);
static int vxlan_ctrl_ftable_entry_add(struct vxlan_softc *, void *);
static int vxlan_ctrl_ftable_entry_rem(struct vxlan_softc *, void *);
static int vxlan_ctrl_flush(struct vxlan_softc *, void *);
static int vxlan_ioctl_drvspec(struct vxlan_softc *,
struct ifdrv *, int);
static int vxlan_ioctl_ifflags(struct vxlan_softc *);
static int vxlan_ioctl(struct ifnet *, u_long, caddr_t);
#if defined(INET) || defined(INET6)
static uint16_t vxlan_pick_source_port(struct vxlan_softc *, struct mbuf *);
static void vxlan_encap_header(struct vxlan_softc *, struct mbuf *,
int, uint16_t, uint16_t);
#endif
static int vxlan_encap4(struct vxlan_softc *,
const union vxlan_sockaddr *, struct mbuf *);
static int vxlan_encap6(struct vxlan_softc *,
const union vxlan_sockaddr *, struct mbuf *);
static int vxlan_transmit(struct ifnet *, struct mbuf *);
static void vxlan_qflush(struct ifnet *);
static void vxlan_rcv_udp_packet(struct mbuf *, int, struct inpcb *,
const struct sockaddr *, void *);
static int vxlan_input(struct vxlan_socket *, uint32_t, struct mbuf **,
const struct sockaddr *);
static void vxlan_set_default_config(struct vxlan_softc *);
static int vxlan_set_user_config(struct vxlan_softc *,
struct ifvxlanparam *);
static int vxlan_clone_create(struct if_clone *, int, caddr_t);
static void vxlan_clone_destroy(struct ifnet *);
static uint32_t vxlan_mac_hash(struct vxlan_softc *, const uint8_t *);
static int vxlan_media_change(struct ifnet *);
static void vxlan_media_status(struct ifnet *, struct ifmediareq *);
static int vxlan_sockaddr_cmp(const union vxlan_sockaddr *,
const struct sockaddr *);
static void vxlan_sockaddr_copy(union vxlan_sockaddr *,
const struct sockaddr *);
static int vxlan_sockaddr_in_equal(const union vxlan_sockaddr *,
const struct sockaddr *);
static void vxlan_sockaddr_in_copy(union vxlan_sockaddr *,
const struct sockaddr *);
static int vxlan_sockaddr_supported(const union vxlan_sockaddr *, int);
static int vxlan_sockaddr_in_any(const union vxlan_sockaddr *);
static int vxlan_sockaddr_in_multicast(const union vxlan_sockaddr *);
static int vxlan_sockaddr_in6_embedscope(union vxlan_sockaddr *);
static int vxlan_can_change_config(struct vxlan_softc *);
static int vxlan_check_vni(uint32_t);
static int vxlan_check_ttl(int);
static int vxlan_check_ftable_timeout(uint32_t);
static int vxlan_check_ftable_max(uint32_t);
static void vxlan_sysctl_setup(struct vxlan_softc *);
static void vxlan_sysctl_destroy(struct vxlan_softc *);
static int vxlan_tunable_int(struct vxlan_softc *, const char *, int);
static void vxlan_ifdetach_event(void *, struct ifnet *);
static void vxlan_load(void);
static void vxlan_unload(void);
static int vxlan_modevent(module_t, int, void *);
static const char vxlan_name[] = "vxlan";
static MALLOC_DEFINE(M_VXLAN, vxlan_name,
"Virtual eXtensible LAN Interface");
static struct if_clone *vxlan_cloner;
static struct mtx vxlan_list_mtx;
#define VXLAN_LIST_LOCK() mtx_lock(&vxlan_list_mtx)
#define VXLAN_LIST_UNLOCK() mtx_unlock(&vxlan_list_mtx)
static LIST_HEAD(, vxlan_socket) vxlan_socket_list;
static eventhandler_tag vxlan_ifdetach_event_tag;
SYSCTL_DECL(_net_link);
SYSCTL_NODE(_net_link, OID_AUTO, vxlan, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Virtual eXtensible Local Area Network");
static int vxlan_legacy_port = 0;
TUNABLE_INT("net.link.vxlan.legacy_port", &vxlan_legacy_port);
static int vxlan_reuse_port = 0;
TUNABLE_INT("net.link.vxlan.reuse_port", &vxlan_reuse_port);
/* Default maximum number of addresses in the forwarding table. */
#ifndef VXLAN_FTABLE_MAX
#define VXLAN_FTABLE_MAX 2000
#endif
/* Timeout (in seconds) of addresses learned in the forwarding table. */
#ifndef VXLAN_FTABLE_TIMEOUT
#define VXLAN_FTABLE_TIMEOUT (20 * 60)
#endif
/*
* Maximum timeout (in seconds) of addresses learned in the forwarding
* table.
*/
#ifndef VXLAN_FTABLE_MAX_TIMEOUT
#define VXLAN_FTABLE_MAX_TIMEOUT (60 * 60 * 24)
#endif
/* Number of seconds between pruning attempts of the forwarding table. */
#ifndef VXLAN_FTABLE_PRUNE
#define VXLAN_FTABLE_PRUNE (5 * 60)
#endif
static int vxlan_ftable_prune_period = VXLAN_FTABLE_PRUNE;
struct vxlan_control {
int (*vxlc_func)(struct vxlan_softc *, void *);
int vxlc_argsize;
int vxlc_flags;
#define VXLAN_CTRL_FLAG_COPYIN 0x01
#define VXLAN_CTRL_FLAG_COPYOUT 0x02
#define VXLAN_CTRL_FLAG_SUSER 0x04
};
static const struct vxlan_control vxlan_control_table[] = {
[VXLAN_CMD_GET_CONFIG] =
{ vxlan_ctrl_get_config, sizeof(struct ifvxlancfg),
VXLAN_CTRL_FLAG_COPYOUT
},
[VXLAN_CMD_SET_VNI] =
{ vxlan_ctrl_set_vni, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_LOCAL_ADDR] =
{ vxlan_ctrl_set_local_addr, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_REMOTE_ADDR] =
{ vxlan_ctrl_set_remote_addr, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_LOCAL_PORT] =
{ vxlan_ctrl_set_local_port, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_REMOTE_PORT] =
{ vxlan_ctrl_set_remote_port, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_PORT_RANGE] =
{ vxlan_ctrl_set_port_range, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_FTABLE_TIMEOUT] =
{ vxlan_ctrl_set_ftable_timeout, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_FTABLE_MAX] =
{ vxlan_ctrl_set_ftable_max, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_MULTICAST_IF] =
{ vxlan_ctrl_set_multicast_if, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_TTL] =
{ vxlan_ctrl_set_ttl, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_SET_LEARN] =
{ vxlan_ctrl_set_learn, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_FTABLE_ENTRY_ADD] =
{ vxlan_ctrl_ftable_entry_add, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_FTABLE_ENTRY_REM] =
{ vxlan_ctrl_ftable_entry_rem, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
[VXLAN_CMD_FLUSH] =
{ vxlan_ctrl_flush, sizeof(struct ifvxlancmd),
VXLAN_CTRL_FLAG_COPYIN | VXLAN_CTRL_FLAG_SUSER,
},
};
static const int vxlan_control_table_size = nitems(vxlan_control_table);
static int
vxlan_ftable_addr_cmp(const uint8_t *a, const uint8_t *b)
{
int i, d;
for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++)
d = ((int)a[i]) - ((int)b[i]);
return (d);
}
static void
vxlan_ftable_init(struct vxlan_softc *sc)
{
int i;
sc->vxl_ftable = malloc(sizeof(struct vxlan_ftable_head) *
VXLAN_SC_FTABLE_SIZE, M_VXLAN, M_ZERO | M_WAITOK);
for (i = 0; i < VXLAN_SC_FTABLE_SIZE; i++)
LIST_INIT(&sc->vxl_ftable[i]);
sc->vxl_ftable_hash_key = arc4random();
}
static void
vxlan_ftable_fini(struct vxlan_softc *sc)
{
int i;
for (i = 0; i < VXLAN_SC_FTABLE_SIZE; i++) {
KASSERT(LIST_EMPTY(&sc->vxl_ftable[i]),
("%s: vxlan %p ftable[%d] not empty", __func__, sc, i));
}
MPASS(sc->vxl_ftable_cnt == 0);
free(sc->vxl_ftable, M_VXLAN);
sc->vxl_ftable = NULL;
}
static void
vxlan_ftable_flush(struct vxlan_softc *sc, int all)
{
struct vxlan_ftable_entry *fe, *tfe;
int i;
for (i = 0; i < VXLAN_SC_FTABLE_SIZE; i++) {
LIST_FOREACH_SAFE(fe, &sc->vxl_ftable[i], vxlfe_hash, tfe) {
if (all || VXLAN_FE_IS_DYNAMIC(fe))
vxlan_ftable_entry_destroy(sc, fe);
}
}
}
static void
vxlan_ftable_expire(struct vxlan_softc *sc)
{
struct vxlan_ftable_entry *fe, *tfe;
int i;
VXLAN_LOCK_WASSERT(sc);
for (i = 0; i < VXLAN_SC_FTABLE_SIZE; i++) {
LIST_FOREACH_SAFE(fe, &sc->vxl_ftable[i], vxlfe_hash, tfe) {
if (VXLAN_FE_IS_DYNAMIC(fe) &&
time_uptime >= fe->vxlfe_expire)
vxlan_ftable_entry_destroy(sc, fe);
}
}
}
static int
vxlan_ftable_update_locked(struct vxlan_softc *sc,
const union vxlan_sockaddr *vxlsa, const uint8_t *mac,
struct rm_priotracker *tracker)
{
struct vxlan_ftable_entry *fe;
int error __unused;
VXLAN_LOCK_ASSERT(sc);
again:
/*
* A forwarding entry for this MAC address might already exist. If
* so, update it, otherwise create a new one. We may have to upgrade
* the lock if we have to change or create an entry.
*/
fe = vxlan_ftable_entry_lookup(sc, mac);
if (fe != NULL) {
fe->vxlfe_expire = time_uptime + sc->vxl_ftable_timeout;
if (!VXLAN_FE_IS_DYNAMIC(fe) ||
vxlan_sockaddr_in_equal(&fe->vxlfe_raddr, &vxlsa->sa))
return (0);
if (!VXLAN_LOCK_WOWNED(sc)) {
VXLAN_RUNLOCK(sc, tracker);
VXLAN_WLOCK(sc);
sc->vxl_stats.ftable_lock_upgrade_failed++;
goto again;
}
vxlan_sockaddr_in_copy(&fe->vxlfe_raddr, &vxlsa->sa);
return (0);
}
if (!VXLAN_LOCK_WOWNED(sc)) {
VXLAN_RUNLOCK(sc, tracker);
VXLAN_WLOCK(sc);
sc->vxl_stats.ftable_lock_upgrade_failed++;
goto again;
}
if (sc->vxl_ftable_cnt >= sc->vxl_ftable_max) {
sc->vxl_stats.ftable_nospace++;
return (ENOSPC);
}
fe = vxlan_ftable_entry_alloc();
if (fe == NULL)
return (ENOMEM);
vxlan_ftable_entry_init(sc, fe, mac, &vxlsa->sa, VXLAN_FE_FLAG_DYNAMIC);
/* The prior lookup failed, so the insert should not. */
error = vxlan_ftable_entry_insert(sc, fe);
MPASS(error == 0);
return (0);
}
static int
vxlan_ftable_learn(struct vxlan_softc *sc, const struct sockaddr *sa,
const uint8_t *mac)
{
struct rm_priotracker tracker;
union vxlan_sockaddr vxlsa;
int error;
/*
* The source port may be randomly selected by the remote host, so
* use the port of the default destination address.
*/
vxlan_sockaddr_copy(&vxlsa, sa);
vxlsa.in4.sin_port = sc->vxl_dst_addr.in4.sin_port;
if (VXLAN_SOCKADDR_IS_IPV6(&vxlsa)) {
error = vxlan_sockaddr_in6_embedscope(&vxlsa);
if (error)
return (error);
}
VXLAN_RLOCK(sc, &tracker);
error = vxlan_ftable_update_locked(sc, &vxlsa, mac, &tracker);
VXLAN_UNLOCK(sc, &tracker);
return (error);
}
static int
vxlan_ftable_sysctl_dump(SYSCTL_HANDLER_ARGS)
{
struct rm_priotracker tracker;
struct sbuf sb;
struct vxlan_softc *sc;
struct vxlan_ftable_entry *fe;
size_t size;
int i, error;
/*
* This is mostly intended for debugging during development. It is
* not practical to dump an entire large table this way.
*/
sc = arg1;
size = PAGE_SIZE; /* Calculate later. */
sbuf_new(&sb, NULL, size, SBUF_FIXEDLEN);
sbuf_putc(&sb, '\n');
VXLAN_RLOCK(sc, &tracker);
for (i = 0; i < VXLAN_SC_FTABLE_SIZE; i++) {
LIST_FOREACH(fe, &sc->vxl_ftable[i], vxlfe_hash) {
if (sbuf_error(&sb) != 0)
break;
vxlan_ftable_entry_dump(fe, &sb);
}
}
VXLAN_RUNLOCK(sc, &tracker);
if (sbuf_len(&sb) == 1)
sbuf_setpos(&sb, 0);
sbuf_finish(&sb);
error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
sbuf_delete(&sb);
return (error);
}
static struct vxlan_ftable_entry *
vxlan_ftable_entry_alloc(void)
{
struct vxlan_ftable_entry *fe;
fe = malloc(sizeof(*fe), M_VXLAN, M_ZERO | M_NOWAIT);
return (fe);
}
static void
vxlan_ftable_entry_free(struct vxlan_ftable_entry *fe)
{
free(fe, M_VXLAN);
}
static void
vxlan_ftable_entry_init(struct vxlan_softc *sc, struct vxlan_ftable_entry *fe,
const uint8_t *mac, const struct sockaddr *sa, uint32_t flags)
{
fe->vxlfe_flags = flags;
fe->vxlfe_expire = time_uptime + sc->vxl_ftable_timeout;
memcpy(fe->vxlfe_mac, mac, ETHER_ADDR_LEN);
vxlan_sockaddr_copy(&fe->vxlfe_raddr, sa);
}
static void
vxlan_ftable_entry_destroy(struct vxlan_softc *sc,
struct vxlan_ftable_entry *fe)
{
sc->vxl_ftable_cnt--;
LIST_REMOVE(fe, vxlfe_hash);
vxlan_ftable_entry_free(fe);
}
static int
vxlan_ftable_entry_insert(struct vxlan_softc *sc,
struct vxlan_ftable_entry *fe)
{
struct vxlan_ftable_entry *lfe;
uint32_t hash;
int dir;
VXLAN_LOCK_WASSERT(sc);
hash = VXLAN_SC_FTABLE_HASH(sc, fe->vxlfe_mac);
lfe = LIST_FIRST(&sc->vxl_ftable[hash]);
if (lfe == NULL) {
LIST_INSERT_HEAD(&sc->vxl_ftable[hash], fe, vxlfe_hash);
goto out;
}
do {
dir = vxlan_ftable_addr_cmp(fe->vxlfe_mac, lfe->vxlfe_mac);
if (dir == 0)
return (EEXIST);
if (dir > 0) {
LIST_INSERT_BEFORE(lfe, fe, vxlfe_hash);
goto out;
} else if (LIST_NEXT(lfe, vxlfe_hash) == NULL) {
LIST_INSERT_AFTER(lfe, fe, vxlfe_hash);
goto out;
} else
lfe = LIST_NEXT(lfe, vxlfe_hash);
} while (lfe != NULL);
out:
sc->vxl_ftable_cnt++;
return (0);
}
static struct vxlan_ftable_entry *
vxlan_ftable_entry_lookup(struct vxlan_softc *sc, const uint8_t *mac)
{
struct vxlan_ftable_entry *fe;
uint32_t hash;
int dir;
VXLAN_LOCK_ASSERT(sc);
hash = VXLAN_SC_FTABLE_HASH(sc, mac);
LIST_FOREACH(fe, &sc->vxl_ftable[hash], vxlfe_hash) {
dir = vxlan_ftable_addr_cmp(mac, fe->vxlfe_mac);
if (dir == 0)
return (fe);
if (dir > 0)
break;
}
return (NULL);
}
static void
vxlan_ftable_entry_dump(struct vxlan_ftable_entry *fe, struct sbuf *sb)
{
char buf[64];
const union vxlan_sockaddr *sa;
const void *addr;
int i, len, af, width;
sa = &fe->vxlfe_raddr;
af = sa->sa.sa_family;
len = sbuf_len(sb);
sbuf_printf(sb, "%c 0x%02X ", VXLAN_FE_IS_DYNAMIC(fe) ? 'D' : 'S',
fe->vxlfe_flags);
for (i = 0; i < ETHER_ADDR_LEN - 1; i++)
sbuf_printf(sb, "%02X:", fe->vxlfe_mac[i]);
sbuf_printf(sb, "%02X ", fe->vxlfe_mac[i]);
if (af == AF_INET) {
addr = &sa->in4.sin_addr;
width = INET_ADDRSTRLEN - 1;
} else {
addr = &sa->in6.sin6_addr;
width = INET6_ADDRSTRLEN - 1;
}
inet_ntop(af, addr, buf, sizeof(buf));
sbuf_printf(sb, "%*s ", width, buf);
sbuf_printf(sb, "%08jd", (intmax_t)fe->vxlfe_expire);
sbuf_putc(sb, '\n');
/* Truncate a partial line. */
if (sbuf_error(sb) != 0)
sbuf_setpos(sb, len);
}
static struct vxlan_socket *
vxlan_socket_alloc(const union vxlan_sockaddr *sa)
{
struct vxlan_socket *vso;
int i;
vso = malloc(sizeof(*vso), M_VXLAN, M_WAITOK | M_ZERO);
rm_init(&vso->vxlso_lock, "vxlansorm");
refcount_init(&vso->vxlso_refcnt, 0);
for (i = 0; i < VXLAN_SO_VNI_HASH_SIZE; i++)
LIST_INIT(&vso->vxlso_vni_hash[i]);
vso->vxlso_laddr = *sa;
return (vso);
}
static void
vxlan_socket_destroy(struct vxlan_socket *vso)
{
struct socket *so;
#ifdef INVARIANTS
int i;
struct vxlan_socket_mc_info *mc;
for (i = 0; i < VXLAN_SO_MC_MAX_GROUPS; i++) {
mc = &vso->vxlso_mc[i];
KASSERT(mc->vxlsomc_gaddr.sa.sa_family == AF_UNSPEC,
("%s: socket %p mc[%d] still has address",
__func__, vso, i));
}
for (i = 0; i < VXLAN_SO_VNI_HASH_SIZE; i++) {
KASSERT(LIST_EMPTY(&vso->vxlso_vni_hash[i]),
("%s: socket %p vni_hash[%d] not empty",
__func__, vso, i));
}
#endif
so = vso->vxlso_sock;
if (so != NULL) {
vso->vxlso_sock = NULL;
soclose(so);
}
rm_destroy(&vso->vxlso_lock);
free(vso, M_VXLAN);
}
static void
vxlan_socket_release(struct vxlan_socket *vso)
{
int destroy;
VXLAN_LIST_LOCK();
destroy = VXLAN_SO_RELEASE(vso);
if (destroy != 0)
LIST_REMOVE(vso, vxlso_entry);
VXLAN_LIST_UNLOCK();
if (destroy != 0)
vxlan_socket_destroy(vso);
}
static struct vxlan_socket *
vxlan_socket_lookup(union vxlan_sockaddr *vxlsa)
{
struct vxlan_socket *vso;
VXLAN_LIST_LOCK();
LIST_FOREACH(vso, &vxlan_socket_list, vxlso_entry) {
if (vxlan_sockaddr_cmp(&vso->vxlso_laddr, &vxlsa->sa) == 0) {
VXLAN_SO_ACQUIRE(vso);
break;
}
}
VXLAN_LIST_UNLOCK();
return (vso);
}
static void
vxlan_socket_insert(struct vxlan_socket *vso)
{
VXLAN_LIST_LOCK();
VXLAN_SO_ACQUIRE(vso);
LIST_INSERT_HEAD(&vxlan_socket_list, vso, vxlso_entry);
VXLAN_LIST_UNLOCK();
}
static int
vxlan_socket_init(struct vxlan_socket *vso, struct ifnet *ifp)
{
struct thread *td;
int error;
td = curthread;
error = socreate(vso->vxlso_laddr.sa.sa_family, &vso->vxlso_sock,
SOCK_DGRAM, IPPROTO_UDP, td->td_ucred, td);
if (error) {
if_printf(ifp, "cannot create socket: %d\n", error);
return (error);
}
error = udp_set_kernel_tunneling(vso->vxlso_sock,
vxlan_rcv_udp_packet, NULL, vso);
if (error) {
if_printf(ifp, "cannot set tunneling function: %d\n", error);
return (error);
}
if (vxlan_reuse_port != 0) {
struct sockopt sopt;
int val = 1;
bzero(&sopt, sizeof(sopt));
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = IPPROTO_IP;
sopt.sopt_name = SO_REUSEPORT;
sopt.sopt_val = &val;
sopt.sopt_valsize = sizeof(val);
error = sosetopt(vso->vxlso_sock, &sopt);
if (error) {
if_printf(ifp,
"cannot set REUSEADDR socket opt: %d\n", error);
return (error);
}
}
return (0);
}
static int
vxlan_socket_bind(struct vxlan_socket *vso, struct ifnet *ifp)
{
union vxlan_sockaddr laddr;
struct thread *td;
int error;
td = curthread;
laddr = vso->vxlso_laddr;
error = sobind(vso->vxlso_sock, &laddr.sa, td);
if (error) {
if (error != EADDRINUSE)
if_printf(ifp, "cannot bind socket: %d\n", error);
return (error);
}
return (0);
}
static int
vxlan_socket_create(struct ifnet *ifp, int multicast,
const union vxlan_sockaddr *saddr, struct vxlan_socket **vsop)
{
union vxlan_sockaddr laddr;
struct vxlan_socket *vso;
int error;
laddr = *saddr;
/*
* If this socket will be multicast, then only the local port
* must be specified when binding.
*/
if (multicast != 0) {
if (VXLAN_SOCKADDR_IS_IPV4(&laddr))
laddr.in4.sin_addr.s_addr = INADDR_ANY;
#ifdef INET6
else
laddr.in6.sin6_addr = in6addr_any;
#endif
}
vso = vxlan_socket_alloc(&laddr);
if (vso == NULL)
return (ENOMEM);
error = vxlan_socket_init(vso, ifp);
if (error)
goto fail;
error = vxlan_socket_bind(vso, ifp);
if (error)
goto fail;
/*
* There is a small window between the bind completing and
* inserting the socket, so that a concurrent create may fail.
* Let's not worry about that for now.
*/
vxlan_socket_insert(vso);
*vsop = vso;
return (0);
fail:
vxlan_socket_destroy(vso);
return (error);
}
static void
vxlan_socket_ifdetach(struct vxlan_socket *vso, struct ifnet *ifp,
struct vxlan_softc_head *list)
{
struct rm_priotracker tracker;
struct vxlan_softc *sc;
int i;
VXLAN_SO_RLOCK(vso, &tracker);
for (i = 0; i < VXLAN_SO_VNI_HASH_SIZE; i++) {
LIST_FOREACH(sc, &vso->vxlso_vni_hash[i], vxl_entry)
vxlan_ifdetach(sc, ifp, list);
}
VXLAN_SO_RUNLOCK(vso, &tracker);
}
static struct vxlan_socket *
vxlan_socket_mc_lookup(const union vxlan_sockaddr *vxlsa)
{
union vxlan_sockaddr laddr;
struct vxlan_socket *vso;
laddr = *vxlsa;
if (VXLAN_SOCKADDR_IS_IPV4(&laddr))
laddr.in4.sin_addr.s_addr = INADDR_ANY;
#ifdef INET6
else
laddr.in6.sin6_addr = in6addr_any;
#endif
vso = vxlan_socket_lookup(&laddr);
return (vso);
}
static int
vxlan_sockaddr_mc_info_match(const struct vxlan_socket_mc_info *mc,
const union vxlan_sockaddr *group, const union vxlan_sockaddr *local,
int ifidx)
{
if (!vxlan_sockaddr_in_any(local) &&
!vxlan_sockaddr_in_equal(&mc->vxlsomc_saddr, &local->sa))
return (0);
if (!vxlan_sockaddr_in_equal(&mc->vxlsomc_gaddr, &group->sa))
return (0);
if (ifidx != 0 && ifidx != mc->vxlsomc_ifidx)
return (0);
return (1);
}
static int
vxlan_socket_mc_join_group(struct vxlan_socket *vso,
const union vxlan_sockaddr *group, const union vxlan_sockaddr *local,
int *ifidx, union vxlan_sockaddr *source)
{
struct sockopt sopt;
int error;
*source = *local;
if (VXLAN_SOCKADDR_IS_IPV4(group)) {
struct ip_mreq mreq;
mreq.imr_multiaddr = group->in4.sin_addr;
mreq.imr_interface = local->in4.sin_addr;
bzero(&sopt, sizeof(sopt));
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = IPPROTO_IP;
sopt.sopt_name = IP_ADD_MEMBERSHIP;
sopt.sopt_val = &mreq;
sopt.sopt_valsize = sizeof(mreq);
error = sosetopt(vso->vxlso_sock, &sopt);
if (error)
return (error);
/*
* BMV: Ideally, there would be a formal way for us to get
* the local interface that was selected based on the
* imr_interface address. We could then update *ifidx so
* vxlan_sockaddr_mc_info_match() would return a match for
* later creates that explicitly set the multicast interface.
*
* If we really need to, we can of course look in the INP's
* membership list:
* sotoinpcb(vso->vxlso_sock)->inp_moptions->
* imo_head[]->imf_inm->inm_ifp
* similarly to imo_match_group().
*/
source->in4.sin_addr = local->in4.sin_addr;
} else if (VXLAN_SOCKADDR_IS_IPV6(group)) {
struct ipv6_mreq mreq;
mreq.ipv6mr_multiaddr = group->in6.sin6_addr;
mreq.ipv6mr_interface = *ifidx;
bzero(&sopt, sizeof(sopt));
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = IPPROTO_IPV6;
sopt.sopt_name = IPV6_JOIN_GROUP;
sopt.sopt_val = &mreq;
sopt.sopt_valsize = sizeof(mreq);
error = sosetopt(vso->vxlso_sock, &sopt);
if (error)
return (error);
/*
* BMV: As with IPv4, we would really like to know what
* interface in6p_lookup_mcast_ifp() selected.
*/
} else
error = EAFNOSUPPORT;
return (error);
}
static int
vxlan_socket_mc_leave_group(struct vxlan_socket *vso,
const union vxlan_sockaddr *group, const union vxlan_sockaddr *source,
int ifidx)
{
struct sockopt sopt;
int error;
bzero(&sopt, sizeof(sopt));
sopt.sopt_dir = SOPT_SET;
if (VXLAN_SOCKADDR_IS_IPV4(group)) {
struct ip_mreq mreq;
mreq.imr_multiaddr = group->in4.sin_addr;
mreq.imr_interface = source->in4.sin_addr;
sopt.sopt_level = IPPROTO_IP;
sopt.sopt_name = IP_DROP_MEMBERSHIP;
sopt.sopt_val = &mreq;
sopt.sopt_valsize = sizeof(mreq);
error = sosetopt(vso->vxlso_sock, &sopt);
} else if (VXLAN_SOCKADDR_IS_IPV6(group)) {
struct ipv6_mreq mreq;
mreq.ipv6mr_multiaddr = group->in6.sin6_addr;
mreq.ipv6mr_interface = ifidx;
sopt.sopt_level = IPPROTO_IPV6;
sopt.sopt_name = IPV6_LEAVE_GROUP;
sopt.sopt_val = &mreq;
sopt.sopt_valsize = sizeof(mreq);
error = sosetopt(vso->vxlso_sock, &sopt);
} else
error = EAFNOSUPPORT;
return (error);
}
static int
vxlan_socket_mc_add_group(struct vxlan_socket *vso,
const union vxlan_sockaddr *group, const union vxlan_sockaddr *local,
int ifidx, int *idx)
{
union vxlan_sockaddr source;
struct vxlan_socket_mc_info *mc;
int i, empty, error;
/*
* Within a socket, the same multicast group may be used by multiple
* interfaces, each with a different network identifier. But a socket
* may only join a multicast group once, so keep track of the users
* here.
*/
VXLAN_SO_WLOCK(vso);
for (empty = 0, i = 0; i < VXLAN_SO_MC_MAX_GROUPS; i++) {
mc = &vso->vxlso_mc[i];
if (mc->vxlsomc_gaddr.sa.sa_family == AF_UNSPEC) {
empty++;
continue;
}
if (vxlan_sockaddr_mc_info_match(mc, group, local, ifidx))
goto out;
}
VXLAN_SO_WUNLOCK(vso);
if (empty == 0)
return (ENOSPC);
error = vxlan_socket_mc_join_group(vso, group, local, &ifidx, &source);
if (error)
return (error);
VXLAN_SO_WLOCK(vso);
for (i = 0; i < VXLAN_SO_MC_MAX_GROUPS; i++) {
mc = &vso->vxlso_mc[i];
if (mc->vxlsomc_gaddr.sa.sa_family == AF_UNSPEC) {
vxlan_sockaddr_copy(&mc->vxlsomc_gaddr, &group->sa);
vxlan_sockaddr_copy(&mc->vxlsomc_saddr, &source.sa);
mc->vxlsomc_ifidx = ifidx;
goto out;
}
}
VXLAN_SO_WUNLOCK(vso);
error = vxlan_socket_mc_leave_group(vso, group, &source, ifidx);
MPASS(error == 0);
return (ENOSPC);
out:
mc->vxlsomc_users++;
VXLAN_SO_WUNLOCK(vso);
*idx = i;
return (0);
}
static void
vxlan_socket_mc_release_group_by_idx(struct vxlan_socket *vso, int idx)
{
union vxlan_sockaddr group, source;
struct vxlan_socket_mc_info *mc;
int ifidx, leave;
KASSERT(idx >= 0 && idx < VXLAN_SO_MC_MAX_GROUPS,
("%s: vso %p idx %d out of bounds", __func__, vso, idx));
leave = 0;
mc = &vso->vxlso_mc[idx];
VXLAN_SO_WLOCK(vso);
mc->vxlsomc_users--;
if (mc->vxlsomc_users == 0) {
group = mc->vxlsomc_gaddr;
source = mc->vxlsomc_saddr;
ifidx = mc->vxlsomc_ifidx;
bzero(mc, sizeof(*mc));
leave = 1;
}
VXLAN_SO_WUNLOCK(vso);
if (leave != 0) {
/*
* Our socket's membership in this group may have already
* been removed if we joined through an interface that's
* been detached.
*/
vxlan_socket_mc_leave_group(vso, &group, &source, ifidx);
}
}
static struct vxlan_softc *
vxlan_socket_lookup_softc_locked(struct vxlan_socket *vso, uint32_t vni)
{
struct vxlan_softc *sc;
uint32_t hash;
VXLAN_SO_LOCK_ASSERT(vso);
hash = VXLAN_SO_VNI_HASH(vni);
LIST_FOREACH(sc, &vso->vxlso_vni_hash[hash], vxl_entry) {
if (sc->vxl_vni == vni) {
VXLAN_ACQUIRE(sc);
break;
}
}
return (sc);
}
static struct vxlan_softc *
vxlan_socket_lookup_softc(struct vxlan_socket *vso, uint32_t vni)
{
struct rm_priotracker tracker;
struct vxlan_softc *sc;
VXLAN_SO_RLOCK(vso, &tracker);
sc = vxlan_socket_lookup_softc_locked(vso, vni);
VXLAN_SO_RUNLOCK(vso, &tracker);
return (sc);
}
static int
vxlan_socket_insert_softc(struct vxlan_socket *vso, struct vxlan_softc *sc)
{
struct vxlan_softc *tsc;
uint32_t vni, hash;
vni = sc->vxl_vni;
hash = VXLAN_SO_VNI_HASH(vni);
VXLAN_SO_WLOCK(vso);
tsc = vxlan_socket_lookup_softc_locked(vso, vni);
if (tsc != NULL) {
VXLAN_SO_WUNLOCK(vso);
vxlan_release(tsc);
return (EEXIST);
}
VXLAN_ACQUIRE(sc);
LIST_INSERT_HEAD(&vso->vxlso_vni_hash[hash], sc, vxl_entry);
VXLAN_SO_WUNLOCK(vso);
return (0);
}
static void
vxlan_socket_remove_softc(struct vxlan_socket *vso, struct vxlan_softc *sc)
{
VXLAN_SO_WLOCK(vso);
LIST_REMOVE(sc, vxl_entry);
VXLAN_SO_WUNLOCK(vso);
vxlan_release(sc);
}
static struct ifnet *
vxlan_multicast_if_ref(struct vxlan_softc *sc, int ipv4)
{
struct ifnet *ifp;
VXLAN_LOCK_ASSERT(sc);
if (ipv4 && sc->vxl_im4o != NULL)
ifp = sc->vxl_im4o->imo_multicast_ifp;
else if (!ipv4 && sc->vxl_im6o != NULL)
ifp = sc->vxl_im6o->im6o_multicast_ifp;
else
ifp = NULL;
if (ifp != NULL)
if_ref(ifp);
return (ifp);
}
static void
vxlan_free_multicast(struct vxlan_softc *sc)
{
if (sc->vxl_mc_ifp != NULL) {
if_rele(sc->vxl_mc_ifp);
sc->vxl_mc_ifp = NULL;
sc->vxl_mc_ifindex = 0;
}
if (sc->vxl_im4o != NULL) {
free(sc->vxl_im4o, M_VXLAN);
sc->vxl_im4o = NULL;
}
if (sc->vxl_im6o != NULL) {
free(sc->vxl_im6o, M_VXLAN);
sc->vxl_im6o = NULL;
}
}
static int
vxlan_setup_multicast_interface(struct vxlan_softc *sc)
{
struct ifnet *ifp;
ifp = ifunit_ref(sc->vxl_mc_ifname);
if (ifp == NULL) {
if_printf(sc->vxl_ifp, "multicast interface %s does "
"not exist\n", sc->vxl_mc_ifname);
return (ENOENT);
}
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
if_printf(sc->vxl_ifp, "interface %s does not support "
"multicast\n", sc->vxl_mc_ifname);
if_rele(ifp);
return (ENOTSUP);
}
sc->vxl_mc_ifp = ifp;
sc->vxl_mc_ifindex = ifp->if_index;
return (0);
}
static int
vxlan_setup_multicast(struct vxlan_softc *sc)
{
const union vxlan_sockaddr *group;
int error;
group = &sc->vxl_dst_addr;
error = 0;
if (sc->vxl_mc_ifname[0] != '\0') {
error = vxlan_setup_multicast_interface(sc);
if (error)
return (error);
}
/*
* Initialize an multicast options structure that is sufficiently
* populated for use in the respective IP output routine. This
* structure is typically stored in the socket, but our sockets
* may be shared among multiple interfaces.
*/
if (VXLAN_SOCKADDR_IS_IPV4(group)) {
sc->vxl_im4o = malloc(sizeof(struct ip_moptions), M_VXLAN,
M_ZERO | M_WAITOK);
sc->vxl_im4o->imo_multicast_ifp = sc->vxl_mc_ifp;
sc->vxl_im4o->imo_multicast_ttl = sc->vxl_ttl;
sc->vxl_im4o->imo_multicast_vif = -1;
} else if (VXLAN_SOCKADDR_IS_IPV6(group)) {
sc->vxl_im6o = malloc(sizeof(struct ip6_moptions), M_VXLAN,
M_ZERO | M_WAITOK);
sc->vxl_im6o->im6o_multicast_ifp = sc->vxl_mc_ifp;
sc->vxl_im6o->im6o_multicast_hlim = sc->vxl_ttl;
}
return (error);
}
static int
vxlan_setup_socket(struct vxlan_softc *sc)
{
struct vxlan_socket *vso;
struct ifnet *ifp;
union vxlan_sockaddr *saddr, *daddr;
int multicast, error;
vso = NULL;
ifp = sc->vxl_ifp;
saddr = &sc->vxl_src_addr;
daddr = &sc->vxl_dst_addr;
multicast = vxlan_sockaddr_in_multicast(daddr);
MPASS(multicast != -1);
sc->vxl_vso_mc_index = -1;
/*
* Try to create the socket. If that fails, attempt to use an
* existing socket.
*/
error = vxlan_socket_create(ifp, multicast, saddr, &vso);
if (error) {
if (multicast != 0)
vso = vxlan_socket_mc_lookup(saddr);
else
vso = vxlan_socket_lookup(saddr);
if (vso == NULL) {
if_printf(ifp, "cannot create socket (error: %d), "
"and no existing socket found\n", error);
goto out;
}
}
if (multicast != 0) {
error = vxlan_setup_multicast(sc);
if (error)
goto out;
error = vxlan_socket_mc_add_group(vso, daddr, saddr,
sc->vxl_mc_ifindex, &sc->vxl_vso_mc_index);
if (error)
goto out;
}
sc->vxl_sock = vso;
error = vxlan_socket_insert_softc(vso, sc);
if (error) {
sc->vxl_sock = NULL;
if_printf(ifp, "network identifier %d already exists in "
"this socket\n", sc->vxl_vni);
goto out;
}
return (0);
out:
if (vso != NULL) {
if (sc->vxl_vso_mc_index != -1) {
vxlan_socket_mc_release_group_by_idx(vso,
sc->vxl_vso_mc_index);
sc->vxl_vso_mc_index = -1;
}
if (multicast != 0)
vxlan_free_multicast(sc);
vxlan_socket_release(vso);
}
return (error);
}
static void
vxlan_setup_interface(struct vxlan_softc *sc)
{
struct ifnet *ifp;
ifp = sc->vxl_ifp;
ifp->if_hdrlen = ETHER_HDR_LEN + sizeof(struct vxlanudphdr);
if (VXLAN_SOCKADDR_IS_IPV4(&sc->vxl_dst_addr) != 0)
ifp->if_hdrlen += sizeof(struct ip);
else if (VXLAN_SOCKADDR_IS_IPV6(&sc->vxl_dst_addr) != 0)
ifp->if_hdrlen += sizeof(struct ip6_hdr);
}
static int
vxlan_valid_init_config(struct vxlan_softc *sc)
{
const char *reason;
if (vxlan_check_vni(sc->vxl_vni) != 0) {
reason = "invalid virtual network identifier specified";
goto fail;
}
if (vxlan_sockaddr_supported(&sc->vxl_src_addr, 1) == 0) {
reason = "source address type is not supported";
goto fail;
}
if (vxlan_sockaddr_supported(&sc->vxl_dst_addr, 0) == 0) {
reason = "destination address type is not supported";
goto fail;
}
if (vxlan_sockaddr_in_any(&sc->vxl_dst_addr) != 0) {
reason = "no valid destination address specified";
goto fail;
}
if (vxlan_sockaddr_in_multicast(&sc->vxl_dst_addr) == 0 &&
sc->vxl_mc_ifname[0] != '\0') {
reason = "can only specify interface with a group address";
goto fail;
}
if (vxlan_sockaddr_in_any(&sc->vxl_src_addr) == 0) {
if (VXLAN_SOCKADDR_IS_IPV4(&sc->vxl_src_addr) ^
VXLAN_SOCKADDR_IS_IPV4(&sc->vxl_dst_addr)) {
reason = "source and destination address must both "
"be either IPv4 or IPv6";
goto fail;
}
}
if (sc->vxl_src_addr.in4.sin_port == 0) {
reason = "local port not specified";
goto fail;
}
if (sc->vxl_dst_addr.in4.sin_port == 0) {
reason = "remote port not specified";
goto fail;
}
return (0);
fail:
if_printf(sc->vxl_ifp, "cannot initialize interface: %s\n", reason);
return (EINVAL);
}
static void
vxlan_init_wait(struct vxlan_softc *sc)
{
VXLAN_LOCK_WASSERT(sc);
while (sc->vxl_flags & VXLAN_FLAG_INIT)
rm_sleep(sc, &sc->vxl_lock, 0, "vxlint", hz);
}
static void
vxlan_init_complete(struct vxlan_softc *sc)
{
VXLAN_WLOCK(sc);
sc->vxl_flags &= ~VXLAN_FLAG_INIT;
wakeup(sc);
VXLAN_WUNLOCK(sc);
}
static void
vxlan_init(void *xsc)
{
static const uint8_t empty_mac[ETHER_ADDR_LEN];
struct vxlan_softc *sc;
struct ifnet *ifp;
sc = xsc;
ifp = sc->vxl_ifp;
VXLAN_WLOCK(sc);
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
VXLAN_WUNLOCK(sc);
return;
}
sc->vxl_flags |= VXLAN_FLAG_INIT;
VXLAN_WUNLOCK(sc);
if (vxlan_valid_init_config(sc) != 0)
goto out;
vxlan_setup_interface(sc);
if (vxlan_setup_socket(sc) != 0)
goto out;
/* Initialize the default forwarding entry. */
vxlan_ftable_entry_init(sc, &sc->vxl_default_fe, empty_mac,
&sc->vxl_dst_addr.sa, VXLAN_FE_FLAG_STATIC);
VXLAN_WLOCK(sc);
ifp->if_drv_flags |= IFF_DRV_RUNNING;
callout_reset(&sc->vxl_callout, vxlan_ftable_prune_period * hz,
vxlan_timer, sc);
VXLAN_WUNLOCK(sc);
if_link_state_change(ifp, LINK_STATE_UP);
out:
vxlan_init_complete(sc);
}
static void
vxlan_release(struct vxlan_softc *sc)
{
/*
* The softc may be destroyed as soon as we release our reference,
* so we cannot serialize the wakeup with the softc lock. We use a
* timeout in our sleeps so a missed wakeup is unfortunate but not
* fatal.
*/
if (VXLAN_RELEASE(sc) != 0)
wakeup(sc);
}
static void
vxlan_teardown_wait(struct vxlan_softc *sc)
{
VXLAN_LOCK_WASSERT(sc);
while (sc->vxl_flags & VXLAN_FLAG_TEARDOWN)
rm_sleep(sc, &sc->vxl_lock, 0, "vxltrn", hz);
}
static void
vxlan_teardown_complete(struct vxlan_softc *sc)
{
VXLAN_WLOCK(sc);
sc->vxl_flags &= ~VXLAN_FLAG_TEARDOWN;
wakeup(sc);
VXLAN_WUNLOCK(sc);
}
static void
vxlan_teardown_locked(struct vxlan_softc *sc)
{
struct ifnet *ifp;
struct vxlan_socket *vso;
ifp = sc->vxl_ifp;
VXLAN_LOCK_WASSERT(sc);
MPASS(sc->vxl_flags & VXLAN_FLAG_TEARDOWN);
ifp->if_flags &= ~IFF_UP;
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
callout_stop(&sc->vxl_callout);
vso = sc->vxl_sock;
sc->vxl_sock = NULL;
VXLAN_WUNLOCK(sc);
if_link_state_change(ifp, LINK_STATE_DOWN);
if (vso != NULL) {
vxlan_socket_remove_softc(vso, sc);
if (sc->vxl_vso_mc_index != -1) {
vxlan_socket_mc_release_group_by_idx(vso,
sc->vxl_vso_mc_index);
sc->vxl_vso_mc_index = -1;
}
}
VXLAN_WLOCK(sc);
while (sc->vxl_refcnt != 0)
rm_sleep(sc, &sc->vxl_lock, 0, "vxldrn", hz);
VXLAN_WUNLOCK(sc);
callout_drain(&sc->vxl_callout);
vxlan_free_multicast(sc);
if (vso != NULL)
vxlan_socket_release(vso);
vxlan_teardown_complete(sc);
}
static void
vxlan_teardown(struct vxlan_softc *sc)
{
VXLAN_WLOCK(sc);
if (sc->vxl_flags & VXLAN_FLAG_TEARDOWN) {
vxlan_teardown_wait(sc);
VXLAN_WUNLOCK(sc);
return;
}
sc->vxl_flags |= VXLAN_FLAG_TEARDOWN;
vxlan_teardown_locked(sc);
}
static void
vxlan_ifdetach(struct vxlan_softc *sc, struct ifnet *ifp,
struct vxlan_softc_head *list)
{
VXLAN_WLOCK(sc);
if (sc->vxl_mc_ifp != ifp)
goto out;
if (sc->vxl_flags & VXLAN_FLAG_TEARDOWN)
goto out;
sc->vxl_flags |= VXLAN_FLAG_TEARDOWN;
LIST_INSERT_HEAD(list, sc, vxl_ifdetach_list);
out:
VXLAN_WUNLOCK(sc);
}
static void
vxlan_timer(void *xsc)
{
struct vxlan_softc *sc;
sc = xsc;
VXLAN_LOCK_WASSERT(sc);
vxlan_ftable_expire(sc);
callout_schedule(&sc->vxl_callout, vxlan_ftable_prune_period * hz);
}
static int
vxlan_ioctl_ifflags(struct vxlan_softc *sc)
{
struct ifnet *ifp;
ifp = sc->vxl_ifp;
if (ifp->if_flags & IFF_UP) {
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
vxlan_init(sc);
} else {
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
vxlan_teardown(sc);
}
return (0);
}
static int
vxlan_ctrl_get_config(struct vxlan_softc *sc, void *arg)
{
struct rm_priotracker tracker;
struct ifvxlancfg *cfg;
cfg = arg;
bzero(cfg, sizeof(*cfg));
VXLAN_RLOCK(sc, &tracker);
cfg->vxlc_vni = sc->vxl_vni;
memcpy(&cfg->vxlc_local_sa, &sc->vxl_src_addr,
sizeof(union vxlan_sockaddr));
memcpy(&cfg->vxlc_remote_sa, &sc->vxl_dst_addr,
sizeof(union vxlan_sockaddr));
cfg->vxlc_mc_ifindex = sc->vxl_mc_ifindex;
cfg->vxlc_ftable_cnt = sc->vxl_ftable_cnt;
cfg->vxlc_ftable_max = sc->vxl_ftable_max;
cfg->vxlc_ftable_timeout = sc->vxl_ftable_timeout;
cfg->vxlc_port_min = sc->vxl_min_port;
cfg->vxlc_port_max = sc->vxl_max_port;
cfg->vxlc_learn = (sc->vxl_flags & VXLAN_FLAG_LEARN) != 0;
cfg->vxlc_ttl = sc->vxl_ttl;
VXLAN_RUNLOCK(sc, &tracker);
#ifdef INET6
if (VXLAN_SOCKADDR_IS_IPV6(&cfg->vxlc_local_sa))
sa6_recoverscope(&cfg->vxlc_local_sa.in6);
if (VXLAN_SOCKADDR_IS_IPV6(&cfg->vxlc_remote_sa))
sa6_recoverscope(&cfg->vxlc_remote_sa.in6);
#endif
return (0);
}
static int
vxlan_ctrl_set_vni(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
int error;
cmd = arg;
if (vxlan_check_vni(cmd->vxlcmd_vni) != 0)
return (EINVAL);
VXLAN_WLOCK(sc);
if (vxlan_can_change_config(sc)) {
sc->vxl_vni = cmd->vxlcmd_vni;
error = 0;
} else
error = EBUSY;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_local_addr(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
union vxlan_sockaddr *vxlsa;
int error;
cmd = arg;
vxlsa = &cmd->vxlcmd_sa;
if (!VXLAN_SOCKADDR_IS_IPV46(vxlsa))
return (EINVAL);
if (vxlan_sockaddr_in_multicast(vxlsa) != 0)
return (EINVAL);
if (VXLAN_SOCKADDR_IS_IPV6(vxlsa)) {
error = vxlan_sockaddr_in6_embedscope(vxlsa);
if (error)
return (error);
}
VXLAN_WLOCK(sc);
if (vxlan_can_change_config(sc)) {
vxlan_sockaddr_in_copy(&sc->vxl_src_addr, &vxlsa->sa);
error = 0;
} else
error = EBUSY;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_remote_addr(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
union vxlan_sockaddr *vxlsa;
int error;
cmd = arg;
vxlsa = &cmd->vxlcmd_sa;
if (!VXLAN_SOCKADDR_IS_IPV46(vxlsa))
return (EINVAL);
if (VXLAN_SOCKADDR_IS_IPV6(vxlsa)) {
error = vxlan_sockaddr_in6_embedscope(vxlsa);
if (error)
return (error);
}
VXLAN_WLOCK(sc);
if (vxlan_can_change_config(sc)) {
vxlan_sockaddr_in_copy(&sc->vxl_dst_addr, &vxlsa->sa);
error = 0;
} else
error = EBUSY;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_local_port(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
int error;
cmd = arg;
if (cmd->vxlcmd_port == 0)
return (EINVAL);
VXLAN_WLOCK(sc);
if (vxlan_can_change_config(sc)) {
sc->vxl_src_addr.in4.sin_port = htons(cmd->vxlcmd_port);
error = 0;
} else
error = EBUSY;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_remote_port(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
int error;
cmd = arg;
if (cmd->vxlcmd_port == 0)
return (EINVAL);
VXLAN_WLOCK(sc);
if (vxlan_can_change_config(sc)) {
sc->vxl_dst_addr.in4.sin_port = htons(cmd->vxlcmd_port);
error = 0;
} else
error = EBUSY;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_port_range(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
uint16_t min, max;
int error;
cmd = arg;
min = cmd->vxlcmd_port_min;
max = cmd->vxlcmd_port_max;
if (max < min)
return (EINVAL);
VXLAN_WLOCK(sc);
if (vxlan_can_change_config(sc)) {
sc->vxl_min_port = min;
sc->vxl_max_port = max;
error = 0;
} else
error = EBUSY;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_ftable_timeout(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
int error;
cmd = arg;
VXLAN_WLOCK(sc);
if (vxlan_check_ftable_timeout(cmd->vxlcmd_ftable_timeout) == 0) {
sc->vxl_ftable_timeout = cmd->vxlcmd_ftable_timeout;
error = 0;
} else
error = EINVAL;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_ftable_max(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
int error;
cmd = arg;
VXLAN_WLOCK(sc);
if (vxlan_check_ftable_max(cmd->vxlcmd_ftable_max) == 0) {
sc->vxl_ftable_max = cmd->vxlcmd_ftable_max;
error = 0;
} else
error = EINVAL;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_multicast_if(struct vxlan_softc * sc, void *arg)
{
struct ifvxlancmd *cmd;
int error;
cmd = arg;
VXLAN_WLOCK(sc);
if (vxlan_can_change_config(sc)) {
strlcpy(sc->vxl_mc_ifname, cmd->vxlcmd_ifname, IFNAMSIZ);
error = 0;
} else
error = EBUSY;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_ttl(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
int error;
cmd = arg;
VXLAN_WLOCK(sc);
if (vxlan_check_ttl(cmd->vxlcmd_ttl) == 0) {
sc->vxl_ttl = cmd->vxlcmd_ttl;
if (sc->vxl_im4o != NULL)
sc->vxl_im4o->imo_multicast_ttl = sc->vxl_ttl;
if (sc->vxl_im6o != NULL)
sc->vxl_im6o->im6o_multicast_hlim = sc->vxl_ttl;
error = 0;
} else
error = EINVAL;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_set_learn(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
cmd = arg;
VXLAN_WLOCK(sc);
if (cmd->vxlcmd_flags & VXLAN_CMD_FLAG_LEARN)
sc->vxl_flags |= VXLAN_FLAG_LEARN;
else
sc->vxl_flags &= ~VXLAN_FLAG_LEARN;
VXLAN_WUNLOCK(sc);
return (0);
}
static int
vxlan_ctrl_ftable_entry_add(struct vxlan_softc *sc, void *arg)
{
union vxlan_sockaddr vxlsa;
struct ifvxlancmd *cmd;
struct vxlan_ftable_entry *fe;
int error;
cmd = arg;
vxlsa = cmd->vxlcmd_sa;
if (!VXLAN_SOCKADDR_IS_IPV46(&vxlsa))
return (EINVAL);
if (vxlan_sockaddr_in_any(&vxlsa) != 0)
return (EINVAL);
if (vxlan_sockaddr_in_multicast(&vxlsa) != 0)
return (EINVAL);
/* BMV: We could support both IPv4 and IPv6 later. */
if (vxlsa.sa.sa_family != sc->vxl_dst_addr.sa.sa_family)
return (EAFNOSUPPORT);
if (VXLAN_SOCKADDR_IS_IPV6(&vxlsa)) {
error = vxlan_sockaddr_in6_embedscope(&vxlsa);
if (error)
return (error);
}
fe = vxlan_ftable_entry_alloc();
if (fe == NULL)
return (ENOMEM);
if (vxlsa.in4.sin_port == 0)
vxlsa.in4.sin_port = sc->vxl_dst_addr.in4.sin_port;
vxlan_ftable_entry_init(sc, fe, cmd->vxlcmd_mac, &vxlsa.sa,
VXLAN_FE_FLAG_STATIC);
VXLAN_WLOCK(sc);
error = vxlan_ftable_entry_insert(sc, fe);
VXLAN_WUNLOCK(sc);
if (error)
vxlan_ftable_entry_free(fe);
return (error);
}
static int
vxlan_ctrl_ftable_entry_rem(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
struct vxlan_ftable_entry *fe;
int error;
cmd = arg;
VXLAN_WLOCK(sc);
fe = vxlan_ftable_entry_lookup(sc, cmd->vxlcmd_mac);
if (fe != NULL) {
vxlan_ftable_entry_destroy(sc, fe);
error = 0;
} else
error = ENOENT;
VXLAN_WUNLOCK(sc);
return (error);
}
static int
vxlan_ctrl_flush(struct vxlan_softc *sc, void *arg)
{
struct ifvxlancmd *cmd;
int all;
cmd = arg;
all = cmd->vxlcmd_flags & VXLAN_CMD_FLAG_FLUSH_ALL;
VXLAN_WLOCK(sc);
vxlan_ftable_flush(sc, all);
VXLAN_WUNLOCK(sc);
return (0);
}
static int
vxlan_ioctl_drvspec(struct vxlan_softc *sc, struct ifdrv *ifd, int get)
{
const struct vxlan_control *vc;
union {
struct ifvxlancfg cfg;
struct ifvxlancmd cmd;
} args;
int out, error;
if (ifd->ifd_cmd >= vxlan_control_table_size)
return (EINVAL);
bzero(&args, sizeof(args));
vc = &vxlan_control_table[ifd->ifd_cmd];
out = (vc->vxlc_flags & VXLAN_CTRL_FLAG_COPYOUT) != 0;
if ((get != 0 && out == 0) || (get == 0 && out != 0))
return (EINVAL);
if (vc->vxlc_flags & VXLAN_CTRL_FLAG_SUSER) {
error = priv_check(curthread, PRIV_NET_VXLAN);
if (error)
return (error);
}
if (ifd->ifd_len != vc->vxlc_argsize ||
ifd->ifd_len > sizeof(args))
return (EINVAL);
if (vc->vxlc_flags & VXLAN_CTRL_FLAG_COPYIN) {
error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
if (error)
return (error);
}
error = vc->vxlc_func(sc, &args);
if (error)
return (error);
if (vc->vxlc_flags & VXLAN_CTRL_FLAG_COPYOUT) {
error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
if (error)
return (error);
}
return (0);
}
static int
vxlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct vxlan_softc *sc;
struct ifreq *ifr;
struct ifdrv *ifd;
int error;
sc = ifp->if_softc;
ifr = (struct ifreq *) data;
ifd = (struct ifdrv *) data;
error = 0;
switch (cmd) {
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCGDRVSPEC:
case SIOCSDRVSPEC:
error = vxlan_ioctl_drvspec(sc, ifd, cmd == SIOCGDRVSPEC);
break;
case SIOCSIFFLAGS:
error = vxlan_ioctl_ifflags(sc);
break;
case SIOCSIFMEDIA:
case SIOCGIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &sc->vxl_media, cmd);
break;
case SIOCSIFMTU:
if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > VXLAN_MAX_MTU)
error = EINVAL;
else
ifp->if_mtu = ifr->ifr_mtu;
break;
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
return (error);
}
#if defined(INET) || defined(INET6)
static uint16_t
vxlan_pick_source_port(struct vxlan_softc *sc, struct mbuf *m)
{
int range;
uint32_t hash;
range = sc->vxl_max_port - sc->vxl_min_port + 1;
if (M_HASHTYPE_ISHASH(m))
hash = m->m_pkthdr.flowid;
else
hash = jenkins_hash(m->m_data, ETHER_HDR_LEN,
sc->vxl_port_hash_key);
return (sc->vxl_min_port + (hash % range));
}
static void
vxlan_encap_header(struct vxlan_softc *sc, struct mbuf *m, int ipoff,
uint16_t srcport, uint16_t dstport)
{
struct vxlanudphdr *hdr;
struct udphdr *udph;
struct vxlan_header *vxh;
int len;
len = m->m_pkthdr.len - ipoff;
MPASS(len >= sizeof(struct vxlanudphdr));
hdr = mtodo(m, ipoff);
udph = &hdr->vxlh_udp;
udph->uh_sport = srcport;
udph->uh_dport = dstport;
udph->uh_ulen = htons(len);
udph->uh_sum = 0;
vxh = &hdr->vxlh_hdr;
vxh->vxlh_flags = htonl(VXLAN_HDR_FLAGS_VALID_VNI);
vxh->vxlh_vni = htonl(sc->vxl_vni << VXLAN_HDR_VNI_SHIFT);
}
#endif
static int
vxlan_encap4(struct vxlan_softc *sc, const union vxlan_sockaddr *fvxlsa,
struct mbuf *m)
{
#ifdef INET
struct ifnet *ifp;
struct ip *ip;
struct in_addr srcaddr, dstaddr;
uint16_t srcport, dstport;
int len, mcast, error;
ifp = sc->vxl_ifp;
srcaddr = sc->vxl_src_addr.in4.sin_addr;
srcport = vxlan_pick_source_port(sc, m);
dstaddr = fvxlsa->in4.sin_addr;
dstport = fvxlsa->in4.sin_port;
M_PREPEND(m, sizeof(struct ip) + sizeof(struct vxlanudphdr),
M_NOWAIT);
if (m == NULL) {
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
return (ENOBUFS);
}
len = m->m_pkthdr.len;
ip = mtod(m, struct ip *);
ip->ip_tos = 0;
ip->ip_len = htons(len);
ip->ip_off = 0;
ip->ip_ttl = sc->vxl_ttl;
ip->ip_p = IPPROTO_UDP;
ip->ip_sum = 0;
ip->ip_src = srcaddr;
ip->ip_dst = dstaddr;
vxlan_encap_header(sc, m, sizeof(struct ip), srcport, dstport);
mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0;
m->m_flags &= ~(M_MCAST | M_BCAST);
error = ip_output(m, NULL, NULL, 0, sc->vxl_im4o, NULL);
if (error == 0) {
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
if (mcast != 0)
if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
} else
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
return (error);
#else
m_freem(m);
return (ENOTSUP);
#endif
}
static int
vxlan_encap6(struct vxlan_softc *sc, const union vxlan_sockaddr *fvxlsa,
struct mbuf *m)
{
#ifdef INET6
struct ifnet *ifp;
struct ip6_hdr *ip6;
const struct in6_addr *srcaddr, *dstaddr;
uint16_t srcport, dstport;
int len, mcast, error;
ifp = sc->vxl_ifp;
srcaddr = &sc->vxl_src_addr.in6.sin6_addr;
srcport = vxlan_pick_source_port(sc, m);
dstaddr = &fvxlsa->in6.sin6_addr;
dstport = fvxlsa->in6.sin6_port;
M_PREPEND(m, sizeof(struct ip6_hdr) + sizeof(struct vxlanudphdr),
M_NOWAIT);
if (m == NULL) {
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
return (ENOBUFS);
}
len = m->m_pkthdr.len;
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_flow = 0; /* BMV: Keep in forwarding entry? */
ip6->ip6_vfc = IPV6_VERSION;
ip6->ip6_plen = 0;
ip6->ip6_nxt = IPPROTO_UDP;
ip6->ip6_hlim = sc->vxl_ttl;
ip6->ip6_src = *srcaddr;
ip6->ip6_dst = *dstaddr;
vxlan_encap_header(sc, m, sizeof(struct ip6_hdr), srcport, dstport);
/*
* XXX BMV We need support for RFC6935 before we can send and
* receive IPv6 UDP packets with a zero checksum.
*/
{
struct udphdr *hdr = mtodo(m, sizeof(struct ip6_hdr));
hdr->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);
}
mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0;
m->m_flags &= ~(M_MCAST | M_BCAST);
error = ip6_output(m, NULL, NULL, 0, sc->vxl_im6o, NULL, NULL);
if (error == 0) {
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
if (mcast != 0)
if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
} else
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
return (error);
#else
m_freem(m);
return (ENOTSUP);
#endif
}
static int
vxlan_transmit(struct ifnet *ifp, struct mbuf *m)
{
struct rm_priotracker tracker;
union vxlan_sockaddr vxlsa;
struct vxlan_softc *sc;
struct vxlan_ftable_entry *fe;
struct ifnet *mcifp;
struct ether_header *eh;
int ipv4, error;
sc = ifp->if_softc;
eh = mtod(m, struct ether_header *);
fe = NULL;
mcifp = NULL;
ETHER_BPF_MTAP(ifp, m);
VXLAN_RLOCK(sc, &tracker);
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
VXLAN_RUNLOCK(sc, &tracker);
m_freem(m);
return (ENETDOWN);
}
if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
fe = vxlan_ftable_entry_lookup(sc, eh->ether_dhost);
if (fe == NULL)
fe = &sc->vxl_default_fe;
vxlan_sockaddr_copy(&vxlsa, &fe->vxlfe_raddr.sa);
ipv4 = VXLAN_SOCKADDR_IS_IPV4(&vxlsa) != 0;
if (vxlan_sockaddr_in_multicast(&vxlsa) != 0)
mcifp = vxlan_multicast_if_ref(sc, ipv4);
VXLAN_ACQUIRE(sc);
VXLAN_RUNLOCK(sc, &tracker);
if (ipv4 != 0)
error = vxlan_encap4(sc, &vxlsa, m);
else
error = vxlan_encap6(sc, &vxlsa, m);
vxlan_release(sc);
if (mcifp != NULL)
if_rele(mcifp);
return (error);
}
static void
vxlan_qflush(struct ifnet *ifp __unused)
{
}
static void
vxlan_rcv_udp_packet(struct mbuf *m, int offset, struct inpcb *inpcb,
const struct sockaddr *srcsa, void *xvso)
{
struct vxlan_socket *vso;
struct vxlan_header *vxh, vxlanhdr;
uint32_t vni;
int error __unused;
M_ASSERTPKTHDR(m);
vso = xvso;
offset += sizeof(struct udphdr);
if (m->m_pkthdr.len < offset + sizeof(struct vxlan_header))
goto out;
if (__predict_false(m->m_len < offset + sizeof(struct vxlan_header))) {
m_copydata(m, offset, sizeof(struct vxlan_header),
(caddr_t) &vxlanhdr);
vxh = &vxlanhdr;
} else
vxh = mtodo(m, offset);
/*
* Drop if there is a reserved bit set in either the flags or VNI
* fields of the header. This goes against the specification, but
* a bit set may indicate an unsupported new feature. This matches
* the behavior of the Linux implementation.
*/
if (vxh->vxlh_flags != htonl(VXLAN_HDR_FLAGS_VALID_VNI) ||
vxh->vxlh_vni & ~htonl(VXLAN_VNI_MASK))
goto out;
vni = ntohl(vxh->vxlh_vni) >> VXLAN_HDR_VNI_SHIFT;
/* Adjust to the start of the inner Ethernet frame. */
m_adj(m, offset + sizeof(struct vxlan_header));
error = vxlan_input(vso, vni, &m, srcsa);
MPASS(error != 0 || m == NULL);
out:
if (m != NULL)
m_freem(m);
}
static int
vxlan_input(struct vxlan_socket *vso, uint32_t vni, struct mbuf **m0,
const struct sockaddr *sa)
{
struct vxlan_softc *sc;
struct ifnet *ifp;
struct mbuf *m;
struct ether_header *eh;
int error;
sc = vxlan_socket_lookup_softc(vso, vni);
if (sc == NULL)
return (ENOENT);
ifp = sc->vxl_ifp;
m = *m0;
eh = mtod(m, struct ether_header *);
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
error = ENETDOWN;
goto out;
} else if (ifp == m->m_pkthdr.rcvif) {
/* XXX Does not catch more complex loops. */
error = EDEADLK;
goto out;
}
if (sc->vxl_flags & VXLAN_FLAG_LEARN)
vxlan_ftable_learn(sc, sa, eh->ether_shost);
m_clrprotoflags(m);
m->m_pkthdr.rcvif = ifp;
M_SETFIB(m, ifp->if_fib);
error = netisr_queue_src(NETISR_ETHER, 0, m);
*m0 = NULL;
out:
vxlan_release(sc);
return (error);
}
static void
vxlan_set_default_config(struct vxlan_softc *sc)
{
sc->vxl_flags |= VXLAN_FLAG_LEARN;
sc->vxl_vni = VXLAN_VNI_MAX;
sc->vxl_ttl = IPDEFTTL;
if (!vxlan_tunable_int(sc, "legacy_port", vxlan_legacy_port)) {
sc->vxl_src_addr.in4.sin_port = htons(VXLAN_PORT);
sc->vxl_dst_addr.in4.sin_port = htons(VXLAN_PORT);
} else {
sc->vxl_src_addr.in4.sin_port = htons(VXLAN_LEGACY_PORT);
sc->vxl_dst_addr.in4.sin_port = htons(VXLAN_LEGACY_PORT);
}
sc->vxl_min_port = V_ipport_firstauto;
sc->vxl_max_port = V_ipport_lastauto;
sc->vxl_ftable_max = VXLAN_FTABLE_MAX;
sc->vxl_ftable_timeout = VXLAN_FTABLE_TIMEOUT;
}
static int
vxlan_set_user_config(struct vxlan_softc *sc, struct ifvxlanparam *vxlp)
{
#ifndef INET
if (vxlp->vxlp_with & (VXLAN_PARAM_WITH_LOCAL_ADDR4 |
VXLAN_PARAM_WITH_REMOTE_ADDR4))
return (EAFNOSUPPORT);
#endif
#ifndef INET6
if (vxlp->vxlp_with & (VXLAN_PARAM_WITH_LOCAL_ADDR6 |
VXLAN_PARAM_WITH_REMOTE_ADDR6))
return (EAFNOSUPPORT);
#else
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_LOCAL_ADDR6) {
int error = vxlan_sockaddr_in6_embedscope(&vxlp->vxlp_local_sa);
if (error)
return (error);
}
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_REMOTE_ADDR6) {
int error = vxlan_sockaddr_in6_embedscope(
&vxlp->vxlp_remote_sa);
if (error)
return (error);
}
#endif
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_VNI) {
if (vxlan_check_vni(vxlp->vxlp_vni) == 0)
sc->vxl_vni = vxlp->vxlp_vni;
}
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_LOCAL_ADDR4) {
sc->vxl_src_addr.in4.sin_len = sizeof(struct sockaddr_in);
sc->vxl_src_addr.in4.sin_family = AF_INET;
sc->vxl_src_addr.in4.sin_addr =
vxlp->vxlp_local_sa.in4.sin_addr;
} else if (vxlp->vxlp_with & VXLAN_PARAM_WITH_LOCAL_ADDR6) {
sc->vxl_src_addr.in6.sin6_len = sizeof(struct sockaddr_in6);
sc->vxl_src_addr.in6.sin6_family = AF_INET6;
sc->vxl_src_addr.in6.sin6_addr =
vxlp->vxlp_local_sa.in6.sin6_addr;
}
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_REMOTE_ADDR4) {
sc->vxl_dst_addr.in4.sin_len = sizeof(struct sockaddr_in);
sc->vxl_dst_addr.in4.sin_family = AF_INET;
sc->vxl_dst_addr.in4.sin_addr =
vxlp->vxlp_remote_sa.in4.sin_addr;
} else if (vxlp->vxlp_with & VXLAN_PARAM_WITH_REMOTE_ADDR6) {
sc->vxl_dst_addr.in6.sin6_len = sizeof(struct sockaddr_in6);
sc->vxl_dst_addr.in6.sin6_family = AF_INET6;
sc->vxl_dst_addr.in6.sin6_addr =
vxlp->vxlp_remote_sa.in6.sin6_addr;
}
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_LOCAL_PORT)
sc->vxl_src_addr.in4.sin_port = htons(vxlp->vxlp_local_port);
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_REMOTE_PORT)
sc->vxl_dst_addr.in4.sin_port = htons(vxlp->vxlp_remote_port);
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_PORT_RANGE) {
if (vxlp->vxlp_min_port <= vxlp->vxlp_max_port) {
sc->vxl_min_port = vxlp->vxlp_min_port;
sc->vxl_max_port = vxlp->vxlp_max_port;
}
}
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_MULTICAST_IF)
strlcpy(sc->vxl_mc_ifname, vxlp->vxlp_mc_ifname, IFNAMSIZ);
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_FTABLE_TIMEOUT) {
if (vxlan_check_ftable_timeout(vxlp->vxlp_ftable_timeout) == 0)
sc->vxl_ftable_timeout = vxlp->vxlp_ftable_timeout;
}
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_FTABLE_MAX) {
if (vxlan_check_ftable_max(vxlp->vxlp_ftable_max) == 0)
sc->vxl_ftable_max = vxlp->vxlp_ftable_max;
}
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_TTL) {
if (vxlan_check_ttl(vxlp->vxlp_ttl) == 0)
sc->vxl_ttl = vxlp->vxlp_ttl;
}
if (vxlp->vxlp_with & VXLAN_PARAM_WITH_LEARN) {
if (vxlp->vxlp_learn == 0)
sc->vxl_flags &= ~VXLAN_FLAG_LEARN;
}
return (0);
}
static int
vxlan_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
struct vxlan_softc *sc;
struct ifnet *ifp;
struct ifvxlanparam vxlp;
int error;
sc = malloc(sizeof(struct vxlan_softc), M_VXLAN, M_WAITOK | M_ZERO);
sc->vxl_unit = unit;
vxlan_set_default_config(sc);
if (params != 0) {
error = copyin(params, &vxlp, sizeof(vxlp));
if (error)
goto fail;
error = vxlan_set_user_config(sc, &vxlp);
if (error)
goto fail;
}
ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
error = ENOSPC;
goto fail;
}
sc->vxl_ifp = ifp;
rm_init(&sc->vxl_lock, "vxlanrm");
callout_init_rw(&sc->vxl_callout, &sc->vxl_lock, 0);
sc->vxl_port_hash_key = arc4random();
vxlan_ftable_init(sc);
vxlan_sysctl_setup(sc);
ifp->if_softc = sc;
if_initname(ifp, vxlan_name, unit);
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_init = vxlan_init;
ifp->if_ioctl = vxlan_ioctl;
ifp->if_transmit = vxlan_transmit;
ifp->if_qflush = vxlan_qflush;
ifp->if_capabilities |= IFCAP_LINKSTATE | IFCAP_JUMBO_MTU;
ifp->if_capenable |= IFCAP_LINKSTATE | IFCAP_JUMBO_MTU;
ifmedia_init(&sc->vxl_media, 0, vxlan_media_change, vxlan_media_status);
ifmedia_add(&sc->vxl_media, IFM_ETHER | IFM_AUTO, 0, NULL);
ifmedia_set(&sc->vxl_media, IFM_ETHER | IFM_AUTO);
ether_gen_addr(ifp, &sc->vxl_hwaddr);
ether_ifattach(ifp, sc->vxl_hwaddr.octet);
ifp->if_baudrate = 0;
ifp->if_hdrlen = 0;
return (0);
fail:
free(sc, M_VXLAN);
return (error);
}
static void
vxlan_clone_destroy(struct ifnet *ifp)
{
struct vxlan_softc *sc;
sc = ifp->if_softc;
vxlan_teardown(sc);
vxlan_ftable_flush(sc, 1);
ether_ifdetach(ifp);
if_free(ifp);
ifmedia_removeall(&sc->vxl_media);
vxlan_ftable_fini(sc);
vxlan_sysctl_destroy(sc);
rm_destroy(&sc->vxl_lock);
free(sc, M_VXLAN);
}
/* BMV: Taken from if_bridge. */
static uint32_t
vxlan_mac_hash(struct vxlan_softc *sc, const uint8_t *addr)
{
uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->vxl_ftable_hash_key;
b += addr[5] << 8;
b += addr[4];
a += addr[3] << 24;
a += addr[2] << 16;
a += addr[1] << 8;
a += addr[0];
/*
* The following hash function is adapted from "Hash Functions" by Bob Jenkins
* ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
*/
#define mix(a, b, c) \
do { \
a -= b; a -= c; a ^= (c >> 13); \
b -= c; b -= a; b ^= (a << 8); \
c -= a; c -= b; c ^= (b >> 13); \
a -= b; a -= c; a ^= (c >> 12); \
b -= c; b -= a; b ^= (a << 16); \
c -= a; c -= b; c ^= (b >> 5); \
a -= b; a -= c; a ^= (c >> 3); \
b -= c; b -= a; b ^= (a << 10); \
c -= a; c -= b; c ^= (b >> 15); \
} while (0)
mix(a, b, c);
#undef mix
return (c);
}
static int
vxlan_media_change(struct ifnet *ifp)
{
/* Ignore. */
return (0);
}
static void
vxlan_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
{
ifmr->ifm_status = IFM_ACTIVE | IFM_AVALID;
ifmr->ifm_active = IFM_ETHER | IFM_FDX;
}
static int
vxlan_sockaddr_cmp(const union vxlan_sockaddr *vxladdr,
const struct sockaddr *sa)
{
return (bcmp(&vxladdr->sa, sa, vxladdr->sa.sa_len));
}
static void
vxlan_sockaddr_copy(union vxlan_sockaddr *vxladdr,
const struct sockaddr *sa)
{
MPASS(sa->sa_family == AF_INET || sa->sa_family == AF_INET6);
bzero(vxladdr, sizeof(*vxladdr));
if (sa->sa_family == AF_INET) {
vxladdr->in4 = *satoconstsin(sa);
vxladdr->in4.sin_len = sizeof(struct sockaddr_in);
} else if (sa->sa_family == AF_INET6) {
vxladdr->in6 = *satoconstsin6(sa);
vxladdr->in6.sin6_len = sizeof(struct sockaddr_in6);
}
}
static int
vxlan_sockaddr_in_equal(const union vxlan_sockaddr *vxladdr,
const struct sockaddr *sa)
{
int equal;
if (sa->sa_family == AF_INET) {
const struct in_addr *in4 = &satoconstsin(sa)->sin_addr;
equal = in4->s_addr == vxladdr->in4.sin_addr.s_addr;
} else if (sa->sa_family == AF_INET6) {
const struct in6_addr *in6 = &satoconstsin6(sa)->sin6_addr;
equal = IN6_ARE_ADDR_EQUAL(in6, &vxladdr->in6.sin6_addr);
} else
equal = 0;
return (equal);
}
static void
vxlan_sockaddr_in_copy(union vxlan_sockaddr *vxladdr,
const struct sockaddr *sa)
{
MPASS(sa->sa_family == AF_INET || sa->sa_family == AF_INET6);
if (sa->sa_family == AF_INET) {
const struct in_addr *in4 = &satoconstsin(sa)->sin_addr;
vxladdr->in4.sin_family = AF_INET;
vxladdr->in4.sin_len = sizeof(struct sockaddr_in);
vxladdr->in4.sin_addr = *in4;
} else if (sa->sa_family == AF_INET6) {
const struct in6_addr *in6 = &satoconstsin6(sa)->sin6_addr;
vxladdr->in6.sin6_family = AF_INET6;
vxladdr->in6.sin6_len = sizeof(struct sockaddr_in6);
vxladdr->in6.sin6_addr = *in6;
}
}
static int
vxlan_sockaddr_supported(const union vxlan_sockaddr *vxladdr, int unspec)
{
const struct sockaddr *sa;
int supported;
sa = &vxladdr->sa;
supported = 0;
if (sa->sa_family == AF_UNSPEC && unspec != 0) {
supported = 1;
} else if (sa->sa_family == AF_INET) {
#ifdef INET
supported = 1;
#endif
} else if (sa->sa_family == AF_INET6) {
#ifdef INET6
supported = 1;
#endif
}
return (supported);
}
static int
vxlan_sockaddr_in_any(const union vxlan_sockaddr *vxladdr)
{
const struct sockaddr *sa;
int any;
sa = &vxladdr->sa;
if (sa->sa_family == AF_INET) {
const struct in_addr *in4 = &satoconstsin(sa)->sin_addr;
any = in4->s_addr == INADDR_ANY;
} else if (sa->sa_family == AF_INET6) {
const struct in6_addr *in6 = &satoconstsin6(sa)->sin6_addr;
any = IN6_IS_ADDR_UNSPECIFIED(in6);
} else
any = -1;
return (any);
}
static int
vxlan_sockaddr_in_multicast(const union vxlan_sockaddr *vxladdr)
{
const struct sockaddr *sa;
int mc;
sa = &vxladdr->sa;
if (sa->sa_family == AF_INET) {
const struct in_addr *in4 = &satoconstsin(sa)->sin_addr;
mc = IN_MULTICAST(ntohl(in4->s_addr));
} else if (sa->sa_family == AF_INET6) {
const struct in6_addr *in6 = &satoconstsin6(sa)->sin6_addr;
mc = IN6_IS_ADDR_MULTICAST(in6);
} else
mc = -1;
return (mc);
}
static int
vxlan_sockaddr_in6_embedscope(union vxlan_sockaddr *vxladdr)
{
int error;
MPASS(VXLAN_SOCKADDR_IS_IPV6(vxladdr));
#ifdef INET6
error = sa6_embedscope(&vxladdr->in6, V_ip6_use_defzone);
#else
error = EAFNOSUPPORT;
#endif
return (error);
}
static int
vxlan_can_change_config(struct vxlan_softc *sc)
{
struct ifnet *ifp;
ifp = sc->vxl_ifp;
VXLAN_LOCK_ASSERT(sc);
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
return (0);
if (sc->vxl_flags & (VXLAN_FLAG_INIT | VXLAN_FLAG_TEARDOWN))
return (0);
return (1);
}
static int
vxlan_check_vni(uint32_t vni)
{
return (vni >= VXLAN_VNI_MAX);
}
static int
vxlan_check_ttl(int ttl)
{
return (ttl > MAXTTL);
}
static int
vxlan_check_ftable_timeout(uint32_t timeout)
{
return (timeout > VXLAN_FTABLE_MAX_TIMEOUT);
}
static int
vxlan_check_ftable_max(uint32_t max)
{
return (max > VXLAN_FTABLE_MAX);
}
static void
vxlan_sysctl_setup(struct vxlan_softc *sc)
{
struct sysctl_ctx_list *ctx;
struct sysctl_oid *node;
struct vxlan_statistics *stats;
char namebuf[8];
ctx = &sc->vxl_sysctl_ctx;
stats = &sc->vxl_stats;
snprintf(namebuf, sizeof(namebuf), "%d", sc->vxl_unit);
sysctl_ctx_init(ctx);
sc->vxl_sysctl_node = SYSCTL_ADD_NODE(ctx,
SYSCTL_STATIC_CHILDREN(_net_link_vxlan), OID_AUTO, namebuf,
CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sc->vxl_sysctl_node),
OID_AUTO, "ftable", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "count",
CTLFLAG_RD, &sc->vxl_ftable_cnt, 0,
"Number of entries in fowarding table");
SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "max",
CTLFLAG_RD, &sc->vxl_ftable_max, 0,
"Maximum number of entries allowed in fowarding table");
SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "timeout",
CTLFLAG_RD, &sc->vxl_ftable_timeout, 0,
"Number of seconds between prunes of the forwarding table");
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "dump",
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_SKIP,
sc, 0, vxlan_ftable_sysctl_dump, "A",
"Dump the forwarding table entries");
node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sc->vxl_sysctl_node),
OID_AUTO, "stats", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(node), OID_AUTO,
"ftable_nospace", CTLFLAG_RD, &stats->ftable_nospace, 0,
"Fowarding table reached maximum entries");
SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(node), OID_AUTO,
"ftable_lock_upgrade_failed", CTLFLAG_RD,
&stats->ftable_lock_upgrade_failed, 0,
"Forwarding table update required lock upgrade");
}
static void
vxlan_sysctl_destroy(struct vxlan_softc *sc)
{
sysctl_ctx_free(&sc->vxl_sysctl_ctx);
sc->vxl_sysctl_node = NULL;
}
static int
vxlan_tunable_int(struct vxlan_softc *sc, const char *knob, int def)
{
char path[64];
snprintf(path, sizeof(path), "net.link.vxlan.%d.%s",
sc->vxl_unit, knob);
TUNABLE_INT_FETCH(path, &def);
return (def);
}
static void
vxlan_ifdetach_event(void *arg __unused, struct ifnet *ifp)
{
struct vxlan_softc_head list;
struct vxlan_socket *vso;
struct vxlan_softc *sc, *tsc;
LIST_INIT(&list);
if (ifp->if_flags & IFF_RENAMING)
return;
if ((ifp->if_flags & IFF_MULTICAST) == 0)
return;
VXLAN_LIST_LOCK();
LIST_FOREACH(vso, &vxlan_socket_list, vxlso_entry)
vxlan_socket_ifdetach(vso, ifp, &list);
VXLAN_LIST_UNLOCK();
LIST_FOREACH_SAFE(sc, &list, vxl_ifdetach_list, tsc) {
LIST_REMOVE(sc, vxl_ifdetach_list);
VXLAN_WLOCK(sc);
if (sc->vxl_flags & VXLAN_FLAG_INIT)
vxlan_init_wait(sc);
vxlan_teardown_locked(sc);
}
}
static void
vxlan_load(void)
{
mtx_init(&vxlan_list_mtx, "vxlan list", NULL, MTX_DEF);
LIST_INIT(&vxlan_socket_list);
vxlan_ifdetach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
vxlan_ifdetach_event, NULL, EVENTHANDLER_PRI_ANY);
vxlan_cloner = if_clone_simple(vxlan_name, vxlan_clone_create,
vxlan_clone_destroy, 0);
}
static void
vxlan_unload(void)
{
EVENTHANDLER_DEREGISTER(ifnet_departure_event,
vxlan_ifdetach_event_tag);
if_clone_detach(vxlan_cloner);
mtx_destroy(&vxlan_list_mtx);
MPASS(LIST_EMPTY(&vxlan_socket_list));
}
static int
vxlan_modevent(module_t mod, int type, void *unused)
{
int error;
error = 0;
switch (type) {
case MOD_LOAD:
vxlan_load();
break;
case MOD_UNLOAD:
vxlan_unload();
break;
default:
error = ENOTSUP;
break;
}
return (error);
}
static moduledata_t vxlan_mod = {
"if_vxlan",
vxlan_modevent,
0
};
DECLARE_MODULE(if_vxlan, vxlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(if_vxlan, 1);
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