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-rw-r--r--src/libsystemd-network/sd-ipv4ll.c188
1 files changed, 82 insertions, 106 deletions
diff --git a/src/libsystemd-network/sd-ipv4ll.c b/src/libsystemd-network/sd-ipv4ll.c
index f292a9dba9..0d5e46dd49 100644
--- a/src/libsystemd-network/sd-ipv4ll.c
+++ b/src/libsystemd-network/sd-ipv4ll.c
@@ -48,14 +48,6 @@
#define log_ipv4ll(ll, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "IPv4LL: " fmt, ##__VA_ARGS__)
-typedef enum IPv4LLTrigger{
- IPV4LL_TRIGGER_NULL,
- IPV4LL_TRIGGER_PACKET,
- IPV4LL_TRIGGER_TIMEOUT,
- _IPV4LL_TRIGGER_MAX,
- _IPV4LL_TRIGGER_INVALID = -1
-} IPv4LLTrigger;
-
typedef enum IPv4LLState {
IPV4LL_STATE_INIT,
IPV4LL_STATE_WAITING_PROBE,
@@ -93,8 +85,6 @@ struct sd_ipv4ll {
void* userdata;
};
-static void ipv4ll_run_state_machine(sd_ipv4ll *ll, IPv4LLTrigger trigger, void *trigger_data);
-
static void ipv4ll_set_state(sd_ipv4ll *ll, IPv4LLState st, int reset_counter) {
assert(ll);
@@ -163,17 +153,6 @@ static int ipv4ll_pick_address(sd_ipv4ll *ll, be32_t *address) {
return 0;
}
-static int ipv4ll_timer(sd_event_source *s, uint64_t usec, void *userdata) {
- sd_ipv4ll *ll = (sd_ipv4ll*)userdata;
-
- assert(ll);
-
- ll->next_wakeup_valid = 0;
- ipv4ll_run_state_machine(ll, IPV4LL_TRIGGER_TIMEOUT, NULL);
-
- return 0;
-}
-
static void ipv4ll_set_next_wakeup(sd_ipv4ll *ll, int sec, int random_sec) {
usec_t next_timeout = 0;
usec_t time_now = 0;
@@ -216,11 +195,11 @@ static bool ipv4ll_arp_probe_conflict (sd_ipv4ll *ll, struct ether_arp *arp) {
return false;
}
-static void ipv4ll_run_state_machine(sd_ipv4ll *ll, IPv4LLTrigger trigger, void *trigger_data) {
+static int ipv4ll_on_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
+ sd_ipv4ll *ll = userdata;
int r = 0;
assert(ll);
- assert(trigger < _IPV4LL_TRIGGER_MAX);
if (ll->state == IPV4LL_STATE_INIT) {
@@ -228,8 +207,8 @@ static void ipv4ll_run_state_machine(sd_ipv4ll *ll, IPv4LLTrigger trigger, void
ipv4ll_set_state(ll, IPV4LL_STATE_WAITING_PROBE, 1);
ipv4ll_set_next_wakeup(ll, 0, PROBE_WAIT);
- } else if ((ll->state == IPV4LL_STATE_WAITING_PROBE && trigger == IPV4LL_TRIGGER_TIMEOUT) ||
- (ll->state == IPV4LL_STATE_PROBING && trigger == IPV4LL_TRIGGER_TIMEOUT && ll->iteration < PROBE_NUM-2)) {
+ } else if (ll->state == IPV4LL_STATE_WAITING_PROBE ||
+ (ll->state == IPV4LL_STATE_PROBING && ll->iteration < PROBE_NUM-2)) {
/* Send a probe */
r = arp_send_probe(ll->fd, ll->index, ll->address, &ll->mac_addr);
@@ -242,7 +221,7 @@ static void ipv4ll_run_state_machine(sd_ipv4ll *ll, IPv4LLTrigger trigger, void
ipv4ll_set_next_wakeup(ll, PROBE_MIN, (PROBE_MAX-PROBE_MIN));
- } else if (ll->state == IPV4LL_STATE_PROBING && trigger == IPV4LL_TRIGGER_TIMEOUT && ll->iteration >= PROBE_NUM-2) {
+ } else if (ll->state == IPV4LL_STATE_PROBING && ll->iteration >= PROBE_NUM-2) {
/* Send the last probe */
r = arp_send_probe(ll->fd, ll->index, ll->address, &ll->mac_addr);
@@ -255,8 +234,8 @@ static void ipv4ll_run_state_machine(sd_ipv4ll *ll, IPv4LLTrigger trigger, void
ipv4ll_set_next_wakeup(ll, ANNOUNCE_WAIT, 0);
- } else if ((ll->state == IPV4LL_STATE_WAITING_ANNOUNCE && trigger == IPV4LL_TRIGGER_TIMEOUT) ||
- (ll->state == IPV4LL_STATE_ANNOUNCING && trigger == IPV4LL_TRIGGER_TIMEOUT && ll->iteration < ANNOUNCE_NUM-1)) {
+ } else if (ll->state == IPV4LL_STATE_WAITING_ANNOUNCE ||
+ (ll->state == IPV4LL_STATE_ANNOUNCING && ll->iteration < ANNOUNCE_NUM-1)) {
/* Send announcement packet */
r = arp_send_announcement(ll->fd, ll->index, ll->address, &ll->mac_addr);
@@ -279,117 +258,114 @@ static void ipv4ll_run_state_machine(sd_ipv4ll *ll, IPv4LLTrigger trigger, void
ll->conflict = 0;
}
- } else if ((ll->state == IPV4LL_STATE_ANNOUNCING && trigger == IPV4LL_TRIGGER_TIMEOUT &&
+ } else if ((ll->state == IPV4LL_STATE_ANNOUNCING &&
ll->iteration >= ANNOUNCE_NUM-1)) {
ipv4ll_set_state(ll, IPV4LL_STATE_RUNNING, 0);
ll->next_wakeup_valid = 0;
+ }
- } else if (trigger == IPV4LL_TRIGGER_PACKET) {
-
- int conflicted = 0;
- usec_t time_now;
- struct ether_arp* in_packet = (struct ether_arp*)trigger_data;
-
- assert(in_packet);
-
- if (IN_SET(ll->state, IPV4LL_STATE_ANNOUNCING, IPV4LL_STATE_RUNNING)) {
-
- if (ipv4ll_arp_conflict(ll, in_packet)) {
+ if (ll->next_wakeup_valid) {
+ ll->timer = sd_event_source_unref(ll->timer);
+ r = sd_event_add_time(ll->event, &ll->timer, clock_boottime_or_monotonic(),
+ ll->next_wakeup, 0, ipv4ll_on_timeout, ll);
+ if (r < 0)
+ goto out;
- r = sd_event_now(ll->event, clock_boottime_or_monotonic(), &time_now);
- if (r < 0)
- goto out;
+ r = sd_event_source_set_priority(ll->timer, ll->event_priority);
+ if (r < 0)
+ goto out;
- /* Defend address */
- if (time_now > ll->defend_window) {
- ll->defend_window = time_now + DEFEND_INTERVAL * USEC_PER_SEC;
- r = arp_send_announcement(ll->fd, ll->index, ll->address, &ll->mac_addr);
- if (r < 0) {
- log_ipv4ll(ll, "Failed to send ARP announcement.");
- goto out;
- }
+ r = sd_event_source_set_description(ll->timer, "ipv4ll-timer");
+ if (r < 0)
+ goto out;
+ }
- } else
- conflicted = 1;
- }
+out:
+ if (r < 0 && ll)
+ ipv4ll_stop(ll, r);
- } else if (IN_SET(ll->state, IPV4LL_STATE_WAITING_PROBE,
- IPV4LL_STATE_PROBING,
- IPV4LL_STATE_WAITING_ANNOUNCE)) {
+ return 1;
+}
- conflicted = ipv4ll_arp_probe_conflict(ll, in_packet);
- }
+static int ipv4ll_on_packet(sd_event_source *s, int fd,
+ uint32_t revents, void *userdata) {
+ sd_ipv4ll *ll = userdata;
+ struct ether_arp packet;
+ int conflicted = 0;
+ usec_t time_now;
+ int r;
- if (conflicted) {
- log_ipv4ll(ll, "CONFLICT");
- ll = ipv4ll_client_notify(ll, IPV4LL_EVENT_CONFLICT);
- if (!ll || ll->state == IPV4LL_STATE_STOPPED)
- goto out;
+ assert(ll);
+ assert(fd >= 0);
- ll->claimed_address = 0;
+ r = read(fd, &packet, sizeof(struct ether_arp));
+ if (r < (int) sizeof(struct ether_arp))
+ goto out;
- /* Pick a new address */
- r = ipv4ll_pick_address(ll, &ll->address);
- if (r < 0)
- goto out;
+ if (IN_SET(ll->state, IPV4LL_STATE_ANNOUNCING, IPV4LL_STATE_RUNNING)) {
- ll->fd = safe_close(ll->fd);
+ if (ipv4ll_arp_conflict(ll, &packet)) {
- r = arp_network_bind_raw_socket(ll->index, ll->address, &ll->mac_addr);
+ r = sd_event_now(ll->event, clock_boottime_or_monotonic(), &time_now);
if (r < 0)
goto out;
- ll->fd = r;
-
- ll->conflict++;
- ll->defend_window = 0;
- ipv4ll_set_state(ll, IPV4LL_STATE_WAITING_PROBE, 1);
+ /* Defend address */
+ if (time_now > ll->defend_window) {
+ ll->defend_window = time_now + DEFEND_INTERVAL * USEC_PER_SEC;
+ r = arp_send_announcement(ll->fd, ll->index, ll->address, &ll->mac_addr);
+ if (r < 0) {
+ log_ipv4ll(ll, "Failed to send ARP announcement.");
+ goto out;
+ }
- if (ll->conflict >= MAX_CONFLICTS) {
- log_ipv4ll(ll, "MAX_CONFLICTS");
- ipv4ll_set_next_wakeup(ll, RATE_LIMIT_INTERVAL, PROBE_WAIT);
} else
- ipv4ll_set_next_wakeup(ll, 0, PROBE_WAIT);
+ conflicted = 1;
}
- }
- if (ll->next_wakeup_valid) {
- ll->timer = sd_event_source_unref(ll->timer);
- r = sd_event_add_time(ll->event, &ll->timer, clock_boottime_or_monotonic(),
- ll->next_wakeup, 0, ipv4ll_timer, ll);
- if (r < 0)
+ } else if (IN_SET(ll->state, IPV4LL_STATE_WAITING_PROBE,
+ IPV4LL_STATE_PROBING,
+ IPV4LL_STATE_WAITING_ANNOUNCE))
+ conflicted = ipv4ll_arp_probe_conflict(ll, &packet);
+
+ if (conflicted) {
+ log_ipv4ll(ll, "CONFLICT");
+ ll = ipv4ll_client_notify(ll, IPV4LL_EVENT_CONFLICT);
+ if (!ll || ll->state == IPV4LL_STATE_STOPPED)
goto out;
- r = sd_event_source_set_priority(ll->timer, ll->event_priority);
+ ll->claimed_address = 0;
+
+ /* Pick a new address */
+ r = ipv4ll_pick_address(ll, &ll->address);
if (r < 0)
goto out;
- r = sd_event_source_set_description(ll->timer, "ipv4ll-timer");
+ ll->fd = safe_close(ll->fd);
+
+ r = arp_network_bind_raw_socket(ll->index, ll->address, &ll->mac_addr);
if (r < 0)
goto out;
+
+ ll->fd = r;
+
+ ll->conflict++;
+ ll->defend_window = 0;
+ ipv4ll_set_state(ll, IPV4LL_STATE_WAITING_PROBE, 1);
+
+ if (ll->conflict >= MAX_CONFLICTS) {
+ log_ipv4ll(ll, "MAX_CONFLICTS");
+ ipv4ll_set_next_wakeup(ll, RATE_LIMIT_INTERVAL, PROBE_WAIT);
+ } else
+ ipv4ll_set_next_wakeup(ll, 0, PROBE_WAIT);
}
out:
if (r < 0 && ll)
ipv4ll_stop(ll, r);
-}
-static int ipv4ll_receive_message(sd_event_source *s, int fd,
- uint32_t revents, void *userdata) {
- int r;
- struct ether_arp arp;
- sd_ipv4ll *ll = (sd_ipv4ll*)userdata;
-
- assert(ll);
-
- r = read(fd, &arp, sizeof(struct ether_arp));
- if (r < (int) sizeof(struct ether_arp))
- return 0;
-
- ipv4ll_run_state_machine(ll, IPV4LL_TRIGGER_PACKET, &arp);
-
- return 0;
+ return 1;
}
int sd_ipv4ll_set_index(sd_ipv4ll *ll, int interface_index) {
@@ -564,7 +540,7 @@ int sd_ipv4ll_start (sd_ipv4ll *ll) {
ipv4ll_set_state (ll, IPV4LL_STATE_INIT, 1);
r = sd_event_add_io(ll->event, &ll->receive_message, ll->fd,
- EPOLLIN, ipv4ll_receive_message, ll);
+ EPOLLIN, ipv4ll_on_packet, ll);
if (r < 0)
goto out;
@@ -580,7 +556,7 @@ int sd_ipv4ll_start (sd_ipv4ll *ll) {
&ll->timer,
clock_boottime_or_monotonic(),
now(clock_boottime_or_monotonic()), 0,
- ipv4ll_timer, ll);
+ ipv4ll_on_timeout, ll);
if (r < 0)
goto out;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-03 12:39:09 +0000