diff options
Diffstat (limited to 'src/dhcpv4.c')
| -rw-r--r-- | src/dhcpv4.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/dhcpv4.c b/src/dhcpv4.c index 8c9e9ba..dc10ba3 100644 --- a/src/dhcpv4.c +++ b/src/dhcpv4.c @@ -43,6 +43,7 @@ static void valid_until_cb(struct uloop_timeout *event); static void handle_addrlist_change(struct interface *iface); static void free_dhcpv4_assignment(struct dhcpv4_assignment *a); static void dhcpv4_fr_start(struct dhcpv4_assignment *a); +static void dhcpv4_fr_rand_delay(struct dhcpv4_assignment *a); static void dhcpv4_fr_stop(struct dhcpv4_assignment *a); static void handle_dhcpv4(void *addr, void *data, size_t len, struct interface *iface, void *dest_addr); @@ -461,7 +462,7 @@ static void handle_addrlist_change(struct interface *iface) list_for_each_entry(c, &iface->dhcpv4_assignments, head) { if ((c->flags & OAF_BOUND) && c->fr_ip && !c->fr_cnt) { if (c->accept_fr_nonce || iface->dhcpv4_forcereconf) - dhcpv4_fr_start(c); + dhcpv4_fr_rand_delay(c); else dhcpv4_fr_stop(c); } @@ -630,6 +631,28 @@ static void dhcpv4_fr_start(struct dhcpv4_assignment *a) dhcpv4_fr_send(a); } +static void dhcpv4_fr_delay_timer(struct uloop_timeout *event) +{ + struct dhcpv4_assignment *a = container_of(event, struct dhcpv4_assignment, fr_timer); + struct interface *iface = a->iface; + + (iface->dhcpv4_event.uloop.fd == -1 ? dhcpv4_fr_rand_delay(a) : dhcpv4_fr_start(a)); +} + +static void dhcpv4_fr_rand_delay(struct dhcpv4_assignment *a) +{ +#define MIN_DELAY 500 +#define MAX_FUZZ 500 + int msecs; + + odhcpd_urandom(&msecs, sizeof(msecs)); + + msecs = labs(msecs)%MAX_FUZZ + MIN_DELAY; + + uloop_timeout_set(&a->fr_timer, msecs); + a->fr_timer.cb = dhcpv4_fr_delay_timer; +} + static void dhcpv4_fr_stop(struct dhcpv4_assignment *a) { uloop_timeout_cancel(&a->fr_timer); |