Signed-off-by: Ethan Jackson <[email protected]>
---
lib/bfd.c | 166 ++++++++++++++++++++++++++++++++++++++++---------------------
1 file changed, 109 insertions(+), 57 deletions(-)
diff --git a/lib/bfd.c b/lib/bfd.c
index 3ac257a..054a6ae 100644
--- a/lib/bfd.c
+++ b/lib/bfd.c
@@ -28,6 +28,7 @@
#include "netlink.h"
#include "odp-util.h"
#include "ofpbuf.h"
+#include "ovs-thread.h"
#include "openvswitch/types.h"
#include "packets.h"
#include "poll-loop.h"
@@ -177,46 +178,59 @@ struct bfd {
long long int next_tx; /* Next TX time. */
long long int detect_time; /* RFC 5880 6.8.4 Detection time. */
- int ref_cnt;
int forwarding_override; /* Manual override of 'forwarding' status. */
- bool check_tnl_key; /* Verify tunnel key of inbound packets? */
+
+ atomic_bool check_tnl_key; /* Verify tunnel key of inbound packets? */
+ atomic_int ref_cnt;
};
-static bool bfd_in_poll(const struct bfd *);
-static void bfd_poll(struct bfd *bfd);
-static const char *bfd_diag_str(enum diag);
-static const char *bfd_state_str(enum state);
-static long long int bfd_min_tx(const struct bfd *);
-static long long int bfd_tx_interval(const struct bfd *);
-static long long int bfd_rx_interval(const struct bfd *);
-static void bfd_set_next_tx(struct bfd *);
-static void bfd_set_state(struct bfd *, enum state, enum diag);
-static uint32_t generate_discriminator(void);
-static void bfd_put_details(struct ds *, const struct bfd *);
+static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
+static struct hmap all_bfds__ = HMAP_INITIALIZER(&all_bfds__);
+static struct hmap *all_bfds OVS_GUARDED_BY(mutex) = &all_bfds__;
+
+static bool bfd_in_poll(const struct bfd *) OVS_REQ_WRLOCK(&mutex);
+static void bfd_poll(struct bfd *bfd) OVS_REQ_WRLOCK(&mutex);
+static const char *bfd_diag_str(enum diag) OVS_REQ_WRLOCK(&mutex);
+static const char *bfd_state_str(enum state) OVS_REQ_WRLOCK(&mutex);
+static long long int bfd_min_tx(const struct bfd *) OVS_REQ_WRLOCK(&mutex);
+static long long int bfd_tx_interval(const struct bfd *)
+ OVS_REQ_WRLOCK(&mutex);
+static long long int bfd_rx_interval(const struct bfd *)
+ OVS_REQ_WRLOCK(&mutex);
+static void bfd_set_next_tx(struct bfd *) OVS_REQ_WRLOCK(&mutex);
+static void bfd_set_state(struct bfd *, enum state, enum diag)
+ OVS_REQ_WRLOCK(&mutex);
+static uint32_t generate_discriminator(void) OVS_REQ_WRLOCK(&mutex);
+static void bfd_put_details(struct ds *, const struct bfd *)
+ OVS_REQ_WRLOCK(&mutex);
static void bfd_unixctl_show(struct unixctl_conn *, int argc,
const char *argv[], void *aux OVS_UNUSED);
static void bfd_unixctl_set_forwarding_override(struct unixctl_conn *,
int argc, const char *argv[],
void *aux OVS_UNUSED);
static void log_msg(enum vlog_level, const struct msg *, const char *message,
- const struct bfd *);
+ const struct bfd *) OVS_REQ_WRLOCK(&mutex);
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(20, 20);
-static struct hmap all_bfds = HMAP_INITIALIZER(&all_bfds);
/* Returns true if the interface on which 'bfd' is running may be used to
* forward traffic according to the BFD session state. */
bool
bfd_forwarding(const struct bfd *bfd)
{
+ bool ret;
+
+ ovs_mutex_lock(&mutex);
if (bfd->forwarding_override != -1) {
- return bfd->forwarding_override == 1;
+ ret = bfd->forwarding_override == 1;
+ } else {
+ ret = bfd->state == STATE_UP
+ && bfd->rmt_diag != DIAG_PATH_DOWN
+ && bfd->rmt_diag != DIAG_CPATH_DOWN
+ && bfd->rmt_diag != DIAG_RCPATH_DOWN;
}
-
- return bfd->state == STATE_UP
- && bfd->rmt_diag != DIAG_PATH_DOWN
- && bfd->rmt_diag != DIAG_CPATH_DOWN
- && bfd->rmt_diag != DIAG_RCPATH_DOWN;
+ ovs_mutex_unlock(&mutex);
+ return ret;
}
/* Returns a 'smap' of key value pairs representing the status of 'bfd'
@@ -224,6 +238,7 @@ bfd_forwarding(const struct bfd *bfd)
void
bfd_get_status(const struct bfd *bfd, struct smap *smap)
{
+ ovs_mutex_lock(&mutex);
smap_add(smap, "forwarding", bfd_forwarding(bfd) ? "true" : "false");
smap_add(smap, "state", bfd_state_str(bfd->state));
smap_add(smap, "diagnostic", bfd_diag_str(bfd->diag));
@@ -232,6 +247,7 @@ bfd_get_status(const struct bfd *bfd, struct smap *smap)
smap_add(smap, "remote_state", bfd_state_str(bfd->rmt_state));
smap_add(smap, "remote_diagnostic", bfd_diag_str(bfd->rmt_diag));
}
+ ovs_mutex_unlock(&mutex);
}
/* Initializes, destroys, or reconfigures the BFD session 'bfd' (named 'name'),
@@ -243,19 +259,19 @@ struct bfd *
bfd_configure(struct bfd *bfd, const char *name,
const struct smap *cfg)
{
- static uint16_t udp_src = 0;
- static bool init = false;
+ static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
+ static atomic_uint16_t udp_src = ATOMIC_VAR_INIT(0);
long long int min_tx, min_rx;
bool cpath_down;
- if (!init) {
+ if (ovsthread_once_start(&once)) {
unixctl_command_register("bfd/show", "[interface]", 0, 1,
bfd_unixctl_show, NULL);
unixctl_command_register("bfd/set-forwarding",
"[interface] normal|false|true", 1, 2,
bfd_unixctl_set_forwarding_override, NULL);
- init = true;
+ ovsthread_once_done(&once);
}
if (!cfg || !smap_get_bool(cfg, "enable", false)) {
@@ -263,29 +279,32 @@ bfd_configure(struct bfd *bfd, const char *name,
return NULL;
}
+ ovs_mutex_lock(&mutex);
if (!bfd) {
bfd = xzalloc(sizeof *bfd);
bfd->name = xstrdup(name);
bfd->forwarding_override = -1;
bfd->disc = generate_discriminator();
- hmap_insert(&all_bfds, &bfd->node, bfd->disc);
+ hmap_insert(all_bfds, &bfd->node, bfd->disc);
bfd->diag = DIAG_NONE;
bfd->min_tx = 1000;
bfd->mult = 3;
- bfd->ref_cnt = 1;
+ atomic_init(&bfd->ref_cnt, 1);
/* RFC 5881 section 4
* The source port MUST be in the range 49152 through 65535. The same
* UDP source port number MUST be used for all BFD Control packets
* associated with a particular session. The source port number SHOULD
* be unique among all BFD sessions on the system. */
- bfd->udp_src = (udp_src++ % 16384) + 49152;
+ atomic_add(&udp_src, 1, &bfd->udp_src);
+ bfd->udp_src = (bfd->udp_src % 16384) + 49152;
bfd_set_state(bfd, STATE_DOWN, DIAG_NONE);
}
- bfd->check_tnl_key = smap_get_bool(cfg, "check_tnl_key", false);
+ atomic_store(&bfd->check_tnl_key,
+ smap_get_bool(cfg, "check_tnl_key", false));
min_tx = smap_get_int(cfg, "min_tx", 100);
min_tx = MAX(min_tx, 100);
if (bfd->cfg_min_tx != min_tx) {
@@ -316,6 +335,7 @@ bfd_configure(struct bfd *bfd, const char *name,
}
bfd_poll(bfd);
}
+ ovs_mutex_unlock(&mutex);
return bfd;
}
@@ -324,8 +344,9 @@ bfd_ref(const struct bfd *bfd_)
{
struct bfd *bfd = CONST_CAST(struct bfd *, bfd_);
if (bfd) {
- ovs_assert(bfd->ref_cnt > 0);
- bfd->ref_cnt++;
+ int orig;
+ atomic_add(&bfd->ref_cnt, 1, &orig);
+ ovs_assert(orig > 0);
}
return bfd;
}
@@ -334,11 +355,16 @@ void
bfd_unref(struct bfd *bfd)
{
if (bfd) {
- ovs_assert(bfd->ref_cnt > 0);
- if (!--bfd->ref_cnt) {
- hmap_remove(&all_bfds, &bfd->node);
+ int orig;
+
+ atomic_sub(&bfd->ref_cnt, 1, &orig);
+ ovs_assert(orig > 0);
+ if (orig == 1) {
+ ovs_mutex_lock(&mutex);
+ hmap_remove(all_bfds, &bfd->node);
free(bfd->name);
free(bfd);
+ ovs_mutex_unlock(&mutex);
}
}
}
@@ -346,6 +372,7 @@ bfd_unref(struct bfd *bfd)
void
bfd_wait(const struct bfd *bfd)
{
+ ovs_mutex_lock(&mutex);
if (bfd->flags & FLAG_FINAL) {
poll_immediate_wake();
}
@@ -354,11 +381,13 @@ bfd_wait(const struct bfd *bfd)
if (bfd->state > STATE_DOWN) {
poll_timer_wait_until(bfd->detect_time);
}
+ ovs_mutex_unlock(&mutex);
}
void
bfd_run(struct bfd *bfd)
{
+ ovs_mutex_lock(&mutex);
if (bfd->state > STATE_DOWN && time_msec() >= bfd->detect_time) {
bfd_set_state(bfd, STATE_DOWN, DIAG_EXPIRED);
}
@@ -366,12 +395,17 @@ bfd_run(struct bfd *bfd)
if (bfd->min_tx != bfd->cfg_min_tx || bfd->min_rx != bfd->cfg_min_rx) {
bfd_poll(bfd);
}
+ ovs_mutex_unlock(&mutex);
}
bool
bfd_should_send_packet(const struct bfd *bfd)
{
- return bfd->flags & FLAG_FINAL || time_msec() >= bfd->next_tx;
+ bool ret;
+ ovs_mutex_lock(&mutex);
+ ret = bfd->flags & FLAG_FINAL || time_msec() >= bfd->next_tx;
+ ovs_mutex_unlock(&mutex);
+ return ret;
}
void
@@ -384,6 +418,7 @@ bfd_put_packet(struct bfd *bfd, struct ofpbuf *p,
struct ip_header *ip;
struct msg *msg;
+ ovs_mutex_lock(&mutex);
if (bfd->next_tx) {
long long int delay = time_msec() - bfd->next_tx;
long long int interval = bfd_tx_interval(bfd);
@@ -445,21 +480,26 @@ bfd_put_packet(struct bfd *bfd, struct ofpbuf *p,
bfd->last_tx = time_msec();
bfd_set_next_tx(bfd);
+ ovs_mutex_unlock(&mutex);
}
bool
bfd_should_process_flow(const struct bfd *bfd, const struct flow *flow,
struct flow_wildcards *wc)
{
+ bool check_tnl_key;
+
memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
memset(&wc->masks.tp_dst, 0xff, sizeof wc->masks.tp_dst);
- if (bfd->check_tnl_key) {
+
+ atomic_read(&bfd->check_tnl_key, &check_tnl_key);
+ if (check_tnl_key) {
memset(&wc->masks.tunnel.tun_id, 0xff, sizeof wc->masks.tunnel.tun_id);
}
return (flow->dl_type == htons(ETH_TYPE_IP)
&& flow->nw_proto == IPPROTO_UDP
&& flow->tp_dst == htons(3784)
- && (!bfd->check_tnl_key || flow->tunnel.tun_id == htonll(0)));
+ && (check_tnl_key || flow->tunnel.tun_id == htonll(0)));
}
void
@@ -474,16 +514,17 @@ bfd_process_packet(struct bfd *bfd, const struct flow
*flow,
/* This function is designed to follow section RFC 5880 6.8.6 closely. */
+ ovs_mutex_lock(&mutex);
if (flow->nw_ttl != 255) {
/* XXX Should drop in the kernel to prevent DOS. */
- return;
+ goto out;
}
msg = ofpbuf_at(p, (uint8_t *)p->l7 - (uint8_t *)p->data, BFD_PACKET_LEN);
if (!msg) {
VLOG_INFO_RL(&rl, "%s: Received unparseable BFD control message.",
bfd->name);
- return;
+ goto out;
}
/* RFC 5880 Section 6.8.6
@@ -503,7 +544,7 @@ bfd_process_packet(struct bfd *bfd, const struct flow *flow,
if (version != BFD_VERSION) {
log_msg(VLL_WARN, msg, "Incorrect version", bfd);
- return;
+ goto out;
}
/* Technically this should happen after the length check. We don't support
@@ -511,29 +552,29 @@ bfd_process_packet(struct bfd *bfd, const struct flow
*flow,
if (flags & FLAG_AUTH) {
log_msg(VLL_WARN, msg, "Authenticated control message with"
" authentication disabled", bfd);
- return;
+ goto out;
}
if (msg->length != BFD_PACKET_LEN) {
log_msg(VLL_WARN, msg, "Unexpected length", bfd);
if (msg->length < BFD_PACKET_LEN) {
- return;
+ goto out;
}
}
if (!msg->mult) {
log_msg(VLL_WARN, msg, "Zero multiplier", bfd);
- return;
+ goto out;
}
if (flags & FLAG_MULTIPOINT) {
log_msg(VLL_WARN, msg, "Unsupported multipoint flag", bfd);
- return;
+ goto out;
}
if (!msg->my_disc) {
log_msg(VLL_WARN, msg, "NULL my_disc", bfd);
- return;
+ goto out;
}
pkt_your_disc = ntohl(msg->your_disc);
@@ -545,11 +586,11 @@ bfd_process_packet(struct bfd *bfd, const struct flow
*flow,
* well, so in this respect, we are not compliant. */
if (pkt_your_disc != bfd->disc) {
log_msg(VLL_WARN, msg, "Incorrect your_disc", bfd);
- return;
+ goto out;
}
} else if (rmt_state > STATE_DOWN) {
log_msg(VLL_WARN, msg, "Null your_disc", bfd);
- return;
+ goto out;
}
bfd->rmt_disc = ntohl(msg->my_disc);
@@ -586,7 +627,7 @@ bfd_process_packet(struct bfd *bfd, const struct flow *flow,
if (bfd->state == STATE_ADMIN_DOWN) {
VLOG_DBG_RL(&rl, "Administratively down, dropping control message.");
- return;
+ goto out;
}
if (rmt_state == STATE_ADMIN_DOWN) {
@@ -619,6 +660,9 @@ bfd_process_packet(struct bfd *bfd, const struct flow *flow,
}
}
/* XXX: RFC 5880 Section 6.8.6 Demand mode related calculations here. */
+
+out:
+ ovs_mutex_unlock(&mutex);
}
/* Helpers. */
@@ -824,7 +868,7 @@ generate_discriminator(void)
/* 'disc' is by definition random, so there's no reason to waste time
* hashing it. */
disc = random_uint32();
- HMAP_FOR_EACH_IN_BUCKET (bfd, node, disc, &all_bfds) {
+ HMAP_FOR_EACH_IN_BUCKET (bfd, node, disc, all_bfds) {
if (bfd->disc == disc) {
disc = 0;
break;
@@ -836,11 +880,11 @@ generate_discriminator(void)
}
static struct bfd *
-bfd_find_by_name(const char *name)
+bfd_find_by_name(const char *name) OVS_REQ_WRLOCK(&mutex)
{
struct bfd *bfd;
- HMAP_FOR_EACH (bfd, node, &all_bfds) {
+ HMAP_FOR_EACH (bfd, node, all_bfds) {
if (!strcmp(bfd->name, name)) {
return bfd;
}
@@ -849,7 +893,7 @@ bfd_find_by_name(const char *name)
}
static void
-bfd_put_details(struct ds *ds, const struct bfd *bfd)
+bfd_put_details(struct ds *ds, const struct bfd *bfd) OVS_REQ_WRLOCK(mutex)
{
ds_put_format(ds, "\tForwarding: %s\n",
bfd_forwarding(bfd) ? "true" : "false");
@@ -897,21 +941,25 @@ bfd_unixctl_show(struct unixctl_conn *conn, int argc,
const char *argv[],
struct ds ds = DS_EMPTY_INITIALIZER;
struct bfd *bfd;
+ ovs_mutex_lock(&mutex);
if (argc > 1) {
bfd = bfd_find_by_name(argv[1]);
if (!bfd) {
unixctl_command_reply_error(conn, "no such bfd object");
- return;
+ goto out;
}
bfd_put_details(&ds, bfd);
} else {
- HMAP_FOR_EACH (bfd, node, &all_bfds) {
+ HMAP_FOR_EACH (bfd, node, all_bfds) {
ds_put_format(&ds, "---- %s ----\n", bfd->name);
bfd_put_details(&ds, bfd);
}
}
unixctl_command_reply(conn, ds_cstr(&ds));
ds_destroy(&ds);
+
+out:
+ ovs_mutex_unlock(&mutex);
}
@@ -923,6 +971,7 @@ bfd_unixctl_set_forwarding_override(struct unixctl_conn
*conn, int argc,
int forwarding_override;
struct bfd *bfd;
+ ovs_mutex_lock(&mutex);
if (!strcasecmp("true", forward_str)) {
forwarding_override = 1;
} else if (!strcasecmp("false", forward_str)) {
@@ -931,21 +980,24 @@ bfd_unixctl_set_forwarding_override(struct unixctl_conn
*conn, int argc,
forwarding_override = -1;
} else {
unixctl_command_reply_error(conn, "unknown fault string");
- return;
+ goto out;
}
if (argc > 2) {
bfd = bfd_find_by_name(argv[1]);
if (!bfd) {
unixctl_command_reply_error(conn, "no such BFD object");
- return;
+ goto out;
}
bfd->forwarding_override = forwarding_override;
} else {
- HMAP_FOR_EACH (bfd, node, &all_bfds) {
+ HMAP_FOR_EACH (bfd, node, all_bfds) {
bfd->forwarding_override = forwarding_override;
}
}
unixctl_command_reply(conn, "OK");
+
+out:
+ ovs_mutex_unlock(&mutex);
}
--
1.7.9.5
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