timer_setup(&peer->T3_rtx_timer, sctp_generate_t3_rtx_event, 0);
timer_setup(&peer->hb_timer, sctp_generate_heartbeat_event, 0);
timer_setup(&peer->reconf_timer, sctp_generate_reconf_event, 0);
+ timer_setup(&peer->probe_timer, sctp_generate_probe_event, 0);
timer_setup(&peer->proto_unreach_timer,
sctp_generate_proto_unreach_event, 0);
if (del_timer(&transport->reconf_timer))
sctp_transport_put(transport);
+ if (del_timer(&transport->probe_timer))
+ sctp_transport_put(transport);
+
/* Delete the ICMP proto unreachable timer if it's active. */
if (del_timer(&transport->proto_unreach_timer))
sctp_transport_put(transport);
sctp_transport_hold(transport);
}
+void sctp_transport_reset_probe_timer(struct sctp_transport *transport)
+{
+ if (timer_pending(&transport->probe_timer))
+ return;
+ if (!mod_timer(&transport->probe_timer,
+ jiffies + transport->probe_interval))
+ sctp_transport_hold(transport);
+}
+
/* This transport has been assigned to an association.
* Initialize fields from the association or from the sock itself.
* Register the reference count in the association.
transport->pathmtu = sctp_dst_mtu(transport->dst);
else
transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
+
+ sctp_transport_pl_update(transport);
+}
+
+void sctp_transport_pl_send(struct sctp_transport *t)
+{
+ pr_debug("%s: PLPMTUD: transport: %p, state: %d, pmtu: %d, size: %d, high: %d\n",
+ __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, t->pl.probe_high);
+
+ if (t->pl.probe_count < SCTP_MAX_PROBES) {
+ t->pl.probe_count++;
+ return;
+ }
+
+ if (t->pl.state == SCTP_PL_BASE) {
+ if (t->pl.probe_size == SCTP_BASE_PLPMTU) { /* BASE_PLPMTU Confirmation Failed */
+ t->pl.state = SCTP_PL_ERROR; /* Base -> Error */
+
+ t->pl.pmtu = SCTP_MIN_PLPMTU;
+ t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+ sctp_assoc_sync_pmtu(t->asoc);
+ }
+ } else if (t->pl.state == SCTP_PL_SEARCH) {
+ if (t->pl.pmtu == t->pl.probe_size) { /* Black Hole Detected */
+ t->pl.state = SCTP_PL_BASE; /* Search -> Base */
+ t->pl.probe_size = SCTP_BASE_PLPMTU;
+ t->pl.probe_high = 0;
+
+ t->pl.pmtu = SCTP_BASE_PLPMTU;
+ t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+ sctp_assoc_sync_pmtu(t->asoc);
+ } else { /* Normal probe failure. */
+ t->pl.probe_high = t->pl.probe_size;
+ t->pl.probe_size = t->pl.pmtu;
+ }
+ } else if (t->pl.state == SCTP_PL_COMPLETE) {
+ if (t->pl.pmtu == t->pl.probe_size) { /* Black Hole Detected */
+ t->pl.state = SCTP_PL_BASE; /* Search Complete -> Base */
+ t->pl.probe_size = SCTP_BASE_PLPMTU;
+
+ t->pl.pmtu = SCTP_BASE_PLPMTU;
+ t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+ sctp_assoc_sync_pmtu(t->asoc);
+ }
+ }
+ t->pl.probe_count = 1;
+}
+
+void sctp_transport_pl_recv(struct sctp_transport *t)
+{
+ pr_debug("%s: PLPMTUD: transport: %p, state: %d, pmtu: %d, size: %d, high: %d\n",
+ __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, t->pl.probe_high);
+
+ t->pl.pmtu = t->pl.probe_size;
+ t->pl.probe_count = 0;
+ if (t->pl.state == SCTP_PL_BASE) {
+ t->pl.state = SCTP_PL_SEARCH; /* Base -> Search */
+ t->pl.probe_size += SCTP_PL_BIG_STEP;
+ } else if (t->pl.state == SCTP_PL_ERROR) {
+ t->pl.state = SCTP_PL_SEARCH; /* Error -> Search */
+
+ t->pl.pmtu = t->pl.probe_size;
+ t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+ sctp_assoc_sync_pmtu(t->asoc);
+ t->pl.probe_size += SCTP_PL_BIG_STEP;
+ } else if (t->pl.state == SCTP_PL_SEARCH) {
+ if (!t->pl.probe_high) {
+ t->pl.probe_size = min(t->pl.probe_size + SCTP_PL_BIG_STEP,
+ SCTP_MAX_PLPMTU);
+ return;
+ }
+ t->pl.probe_size += SCTP_PL_MIN_STEP;
+ if (t->pl.probe_size >= t->pl.probe_high) {
+ t->pl.probe_high = 0;
+ t->pl.raise_count = 0;
+ t->pl.state = SCTP_PL_COMPLETE; /* Search -> Search Complete */
+
+ t->pl.probe_size = t->pl.pmtu;
+ t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+ sctp_assoc_sync_pmtu(t->asoc);
+ }
+ } else if (t->pl.state == SCTP_PL_COMPLETE) {
+ t->pl.raise_count++;
+ if (t->pl.raise_count == 30) {
+ /* Raise probe_size again after 30 * interval in Search Complete */
+ t->pl.state = SCTP_PL_SEARCH; /* Search Complete -> Search */
+ t->pl.probe_size += SCTP_PL_MIN_STEP;
+ }
+ }
+}
+
+static bool sctp_transport_pl_toobig(struct sctp_transport *t, u32 pmtu)
+{
+ pr_debug("%s: PLPMTUD: transport: %p, state: %d, pmtu: %d, size: %d, ptb: %d\n",
+ __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, pmtu);
+
+ if (pmtu < SCTP_MIN_PLPMTU || pmtu >= t->pl.probe_size)
+ return false;
+
+ if (t->pl.state == SCTP_PL_BASE) {
+ if (pmtu >= SCTP_MIN_PLPMTU && pmtu < SCTP_BASE_PLPMTU) {
+ t->pl.state = SCTP_PL_ERROR; /* Base -> Error */
+
+ t->pl.pmtu = SCTP_MIN_PLPMTU;
+ t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+ }
+ } else if (t->pl.state == SCTP_PL_SEARCH) {
+ if (pmtu >= SCTP_BASE_PLPMTU && pmtu < t->pl.pmtu) {
+ t->pl.state = SCTP_PL_BASE; /* Search -> Base */
+ t->pl.probe_size = SCTP_BASE_PLPMTU;
+ t->pl.probe_count = 0;
+
+ t->pl.probe_high = 0;
+ t->pl.pmtu = SCTP_BASE_PLPMTU;
+ t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+ } else if (pmtu > t->pl.pmtu && pmtu < t->pl.probe_size) {
+ t->pl.probe_size = pmtu;
+ t->pl.probe_count = 0;
+
+ return false;
+ }
+ } else if (t->pl.state == SCTP_PL_COMPLETE) {
+ if (pmtu >= SCTP_BASE_PLPMTU && pmtu < t->pl.pmtu) {
+ t->pl.state = SCTP_PL_BASE; /* Complete -> Base */
+ t->pl.probe_size = SCTP_BASE_PLPMTU;
+ t->pl.probe_count = 0;
+
+ t->pl.probe_high = 0;
+ t->pl.pmtu = SCTP_BASE_PLPMTU;
+ t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+ }
+ }
+
+ return true;
}
bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
{
- struct dst_entry *dst = sctp_transport_dst_check(t);
struct sock *sk = t->asoc->base.sk;
+ struct dst_entry *dst;
bool change = true;
if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
}
pmtu = SCTP_TRUNC4(pmtu);
+ if (sctp_transport_pl_enabled(t))
+ return sctp_transport_pl_toobig(t, pmtu - sctp_transport_pl_hlen(t));
+
+ dst = sctp_transport_dst_check(t);
if (dst) {
struct sctp_pf *pf = sctp_get_pf_specific(dst->ops->family);
union sctp_addr addr;
projects / linux-2.6-microblaze.git / blobdiff