static int on_lldp_timer(sd_event_source *s, usec_t t, void *userdata) {
Link *link = userdata;
usec_t current, delay, next;
int r;
assert(s);
assert(userdata);
log_link_debug(link, "Sending LLDP packet...");
r = link_send_lldp(link);
if (r < 0)
log_link_debug_errno(link, r, "Failed to send LLDP packet, ignoring: %m");
if (link->lldp_tx_fast > 0)
link->lldp_tx_fast--;
assert_se(sd_event_now(sd_event_source_get_event(s), clock_boottime_or_monotonic(), ¤t) >= 0);
delay = link->lldp_tx_fast > 0 ? LLDP_FAST_TX_USEC : LLDP_TX_INTERVAL_USEC;
next = usec_add(usec_add(current, delay), (usec_t) random_u64() % LLDP_JITTER_USEC);
r = sd_event_source_set_time(s, next);
if (r < 0)
return log_link_error_errno(link, r, "Failed to restart LLDP timer: %m");
r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
if (r < 0)
return log_link_error_errno(link, r, "Failed to enable LLDP timer: %m");
return 0;
}
static int ipv4acd_set_next_wakeup(sd_ipv4acd *acd, usec_t usec, usec_t random_usec) {
_cleanup_(sd_event_source_unrefp) sd_event_source *timer = NULL;
usec_t next_timeout, time_now;
int r;
assert(acd);
next_timeout = usec;
if (random_usec > 0)
next_timeout += (usec_t) random_u64() % random_usec;
assert_se(sd_event_now(acd->event, clock_boottime_or_monotonic(), &time_now) >= 0);
r = sd_event_add_time(acd->event, &timer, clock_boottime_or_monotonic(), time_now + next_timeout, 0, ipv4acd_on_timeout, acd);
if (r < 0)
return r;
r = sd_event_source_set_priority(timer, acd->event_priority);
if (r < 0)
return r;
(void) sd_event_source_set_description(timer, "ipv4acd-timer");
sd_event_source_unref(acd->timer_event_source);
acd->timer_event_source = timer;
timer = NULL;
return 0;
}
static int pppoe_send(sd_pppoe *ppp, uint8_t code) {
union sockaddr_union link = {
.ll = {
.sll_family = AF_PACKET,
.sll_protocol = htons(ETH_P_PPP_DISC),
.sll_halen = ETH_ALEN,
},
};
_cleanup_free_ struct pppoe_hdr *packet = NULL;
int r;
assert(ppp);
assert(ppp->fd != -1);
assert(IN_SET(code, PADI_CODE, PADR_CODE, PADT_CODE));
link.ll.sll_ifindex = ppp->ifindex;
if (code == PADI_CODE)
memset(&link.ll.sll_addr, 0xff, ETH_ALEN);
else
memcpy(&link.ll.sll_addr, &ppp->peer_mac, ETH_ALEN);
packet = malloc0(PPPOE_MAX_PACKET_SIZE);
if (!packet)
return -ENOMEM;
packet->ver = 0x1;
packet->type = 0x1;
packet->code = code;
if (code == PADT_CODE)
packet->sid = ppp->session_id;
/* Service-Name */
pppoe_tag_append(packet, PPPOE_MAX_PACKET_SIZE, PTT_SRV_NAME,
ppp->service_name, ppp->service_name ? strlen(ppp->service_name) : 0);
/* AC-Cookie */
if (code == PADR_CODE && ppp->tags.cookie)
pppoe_tag_append(packet, PPPOE_MAX_PACKET_SIZE, PTT_AC_COOKIE,
ppp->tags.cookie, ppp->tags.cookie_len);
/* Host-Uniq */
if (code != PADT_CODE) {
ppp->host_uniq = random_u64();
pppoe_tag_append(packet, PPPOE_MAX_PACKET_SIZE, PTT_HOST_UNIQ,
&ppp->host_uniq, sizeof(ppp->host_uniq));
}
r = sendto(ppp->fd, packet, sizeof(struct pppoe_hdr) + PPPOE_PACKET_LENGTH(packet),
0, &link.sa, sizeof(link.ll));
if (r < 0)
return -errno;
return 0;
}
static void prefix_random(const char *name, char **ret) {
uint64_t i, u;
char *m = NULL;
u = 1 + (random_u64() & 3);
for (i = 0; i < u; i++) {
_cleanup_free_ char *b = NULL;
char *x;
assert_se(asprintf(&b, "x%" PRIu64 "x", random_u64()));
x = strjoin(b, ".", name);
assert_se(x);
free(m);
m = x;
}
*ret = m;
}
int link_lldp_emit_start(Link *link) {
usec_t next;
int r;
assert(link);
if (!link->network || link->network->lldp_emit == LLDP_EMIT_NO) {
link_lldp_emit_stop(link);
return 0;
}
/* Starts the LLDP transmission in "fast" mode. If it is already started, turns "fast" mode back on again. */
link->lldp_tx_fast = LLDP_TX_FAST_INIT;
next = usec_add(usec_add(now(clock_boottime_or_monotonic()), LLDP_FAST_TX_USEC),
(usec_t) random_u64() % LLDP_JITTER_USEC);
if (link->lldp_emit_event_source) {
usec_t old;
/* Lower the timeout, maybe */
r = sd_event_source_get_time(link->lldp_emit_event_source, &old);
if (r < 0)
return r;
if (old <= next)
return 0;
return sd_event_source_set_time(link->lldp_emit_event_source, next);
} else {
r = sd_event_add_time(
link->manager->event,
&link->lldp_emit_event_source,
clock_boottime_or_monotonic(),
next,
0,
on_lldp_timer,
link);
if (r < 0)
return r;
(void) sd_event_source_set_description(link->lldp_emit_event_source, "lldp-tx");
}
return 0;
}
inline s64 random_i64() { return s64(random_u64()); }