[TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
};
+/*
+ * Interval between NACKs when packets arrive out of order
+ */
+#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
/*
* Out-of-range value for link session numbers
*/
return l->state == TIPC_LINK_ESTABLISHING;
}
-static void link_handle_out_of_seq_msg(struct tipc_link *link,
- struct sk_buff *skb);
-static void tipc_link_proto_rcv(struct tipc_link *link,
- struct sk_buff *skb);
-static void link_state_event(struct tipc_link *l_ptr, u32 event);
+static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *xmitq);
static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
u16 rcvgap, int tolerance, int priority,
struct sk_buff_head *xmitq);
static void link_reset_statistics(struct tipc_link *l_ptr);
static void link_print(struct tipc_link *l_ptr, const char *str);
-static void tipc_link_sync_xmit(struct tipc_link *l);
+static void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
+ struct sk_buff_head *xmitq);
static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb);
static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);
static bool tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb);
-static void link_activate(struct tipc_link *link);
/*
* Simple link routines
rcu_read_unlock();
}
+/* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints.
+ *
+ * Give a newly added peer node the sequence number where it should
+ * start receiving and acking broadcast packets.
+ */
+static void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
+ struct sk_buff_head *xmitq)
+{
+ struct sk_buff *skb;
+ struct sk_buff_head list;
+
+ skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
+ 0, l->addr, link_own_addr(l), 0, 0, 0);
+ if (!skb)
+ return;
+ __skb_queue_head_init(&list);
+ __skb_queue_tail(&list, skb);
+ tipc_link_xmit(l, &list, xmitq);
+}
+
/**
* tipc_link_fsm_evt - link finite state machine
* @l: pointer to link
int mtyp = 0, rc = 0;
struct tipc_link *pl;
enum {
- LINK_RESET = 1,
- LINK_ACTIVATE = (1 << 1),
- SND_PROBE = (1 << 2),
- SND_STATE = (1 << 3),
- SND_RESET = (1 << 4),
- SND_ACTIVATE = (1 << 5)
+ LINK_RESET = 1,
+ LINK_ACTIVATE = (1 << 1),
+ SND_PROBE = (1 << 2),
+ SND_STATE = (1 << 3),
+ SND_RESET = (1 << 4),
+ SND_ACTIVATE = (1 << 5),
+ SND_BCAST_SYNC = (1 << 6)
} actions = 0;
if (l->exec_mode == TIPC_LINK_BLOCKED)
if (pl && link_probing(pl))
break;
actions |= LINK_ACTIVATE;
- if (l->owner->working_links == 1)
- tipc_link_sync_xmit(l);
+ if (!l->owner->working_links)
+ actions |= SND_BCAST_SYNC;
break;
case PEER_RESET_EVT:
l->state = TIPC_LINK_ESTABLISHING;
if (pl && link_probing(pl))
break;
actions |= LINK_ACTIVATE;
- if (l->owner->working_links == 1)
- tipc_link_sync_xmit(l);
+ if (!l->owner->working_links)
+ actions |= SND_BCAST_SYNC;
break;
case PEER_RESET_EVT:
break;
if (actions & (SND_PROBE | SND_STATE | SND_RESET | SND_ACTIVATE))
tipc_link_build_proto_msg(l, mtyp, actions & SND_PROBE,
0, 0, 0, xmitq);
+ if (actions & SND_BCAST_SYNC)
+ tipc_link_build_bcast_sync_msg(l, xmitq);
return rc;
}
l_ptr->reasm_buf = NULL;
l_ptr->rcv_unacked = 0;
l_ptr->snd_nxt = 1;
+ l_ptr->rcv_nxt = 1;
l_ptr->silent_intv_cnt = 0;
+ l_ptr->stats.recv_info = 0;
l_ptr->stale_count = 0;
link_reset_statistics(l_ptr);
}
-static void link_activate(struct tipc_link *link)
+void tipc_link_activate(struct tipc_link *link)
{
struct tipc_node *node = link->owner;
tipc_bearer_add_dest(node->net, link->bearer_id, link->addr);
}
-/**
- * link_state_event - link finite state machine
- * @l_ptr: pointer to link
- * @event: state machine event to process
- */
-static void link_state_event(struct tipc_link *l, unsigned int evt)
-{
- int rc;
- struct sk_buff_head xmitq;
- struct sk_buff *skb;
-
- if (l->exec_mode == TIPC_LINK_BLOCKED)
- return;
-
- __skb_queue_head_init(&xmitq);
-
- rc = tipc_link_fsm_evt(l, evt, &xmitq);
-
- if (rc & TIPC_LINK_UP_EVT)
- link_activate(l);
-
- if (rc & TIPC_LINK_DOWN_EVT)
- tipc_link_reset(l);
-
- skb = __skb_dequeue(&xmitq);
- if (!skb)
- return;
- tipc_bearer_send(l->owner->net, l->bearer_id, skb, &l->media_addr);
-}
-
/**
* __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
* @link: link to use
return __tipc_link_xmit(link->owner->net, link, &head);
}
-/*
- * tipc_link_sync_xmit - synchronize broadcast link endpoints.
- *
- * Give a newly added peer node the sequence number where it should
- * start receiving and acking broadcast packets.
- *
- * Called with node locked
- */
-static void tipc_link_sync_xmit(struct tipc_link *link)
-{
- struct sk_buff *skb;
- struct tipc_msg *msg;
-
- skb = tipc_buf_acquire(INT_H_SIZE);
- if (!skb)
- return;
-
- msg = buf_msg(skb);
- tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG,
- INT_H_SIZE, link->addr);
- msg_set_last_bcast(msg, link->owner->bclink.acked);
- __tipc_link_xmit_skb(link, skb);
-}
-
/*
* tipc_link_sync_rcv - synchronize broadcast link endpoints.
* Receive the sequence number where we should start receiving and
link->snd_nxt = seqno;
}
+void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
+{
+ struct sk_buff *skb, *_skb;
+ struct tipc_msg *hdr;
+ u16 seqno = l->snd_nxt;
+ u16 ack = l->rcv_nxt - 1;
+
+ while (skb_queue_len(&l->transmq) < l->window) {
+ skb = skb_peek(&l->backlogq);
+ if (!skb)
+ break;
+ _skb = skb_clone(skb, GFP_ATOMIC);
+ if (!_skb)
+ break;
+ __skb_dequeue(&l->backlogq);
+ hdr = buf_msg(skb);
+ l->backlog[msg_importance(hdr)].len--;
+ __skb_queue_tail(&l->transmq, skb);
+ __skb_queue_tail(xmitq, _skb);
+ msg_set_ack(hdr, ack);
+ msg_set_seqno(hdr, seqno);
+ msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
+ l->rcv_unacked = 0;
+ seqno++;
+ }
+ l->snd_nxt = seqno;
+}
+
void tipc_link_reset_all(struct tipc_node *node)
{
char addr_string[16];
}
}
+static int tipc_link_retransm(struct tipc_link *l, int retransm,
+ struct sk_buff_head *xmitq)
+{
+ struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
+ struct tipc_msg *hdr;
+
+ if (!skb)
+ return 0;
+
+ /* Detect repeated retransmit failures on same packet */
+ if (likely(l->last_retransm != buf_seqno(skb))) {
+ l->last_retransm = buf_seqno(skb);
+ l->stale_count = 1;
+ } else if (++l->stale_count > 100) {
+ link_retransmit_failure(l, skb);
+ return TIPC_LINK_DOWN_EVT;
+ }
+ skb_queue_walk(&l->transmq, skb) {
+ if (!retransm)
+ return 0;
+ hdr = buf_msg(skb);
+ _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
+ if (!_skb)
+ return 0;
+ hdr = buf_msg(_skb);
+ msg_set_ack(hdr, l->rcv_nxt - 1);
+ msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
+ _skb->priority = TC_PRIO_CONTROL;
+ __skb_queue_tail(xmitq, _skb);
+ retransm--;
+ l->stats.retransmitted++;
+ }
+ return 0;
+}
+
/* link_synch(): check if all packets arrived before the synch
* point have been consumed
* Returns true if the parallel links are synched, otherwise false
return true;
}
-static void link_retrieve_defq(struct tipc_link *link,
- struct sk_buff_head *list)
-{
- u16 seq_no;
-
- if (skb_queue_empty(&link->deferdq))
- return;
-
- seq_no = buf_seqno(skb_peek(&link->deferdq));
- if (seq_no == link->rcv_nxt)
- skb_queue_splice_tail_init(&link->deferdq, list);
-}
-
-/**
- * tipc_rcv - process TIPC packets/messages arriving from off-node
- * @net: the applicable net namespace
- * @skb: TIPC packet
- * @b_ptr: pointer to bearer message arrived on
- *
- * Invoked with no locks held. Bearer pointer must point to a valid bearer
- * structure (i.e. cannot be NULL), but bearer can be inactive.
- */
-void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
-{
- struct tipc_net *tn = net_generic(net, tipc_net_id);
- struct sk_buff_head head;
- struct tipc_node *n_ptr;
- struct tipc_link *l_ptr;
- struct sk_buff *skb1, *tmp;
- struct tipc_msg *msg;
- u16 seq_no;
- u16 ackd;
- u32 released;
-
- skb2list(skb, &head);
-
- while ((skb = __skb_dequeue(&head))) {
- /* Ensure message is well-formed */
- if (unlikely(!tipc_msg_validate(skb)))
- goto discard;
-
- /* Handle arrival of a non-unicast link message */
- msg = buf_msg(skb);
- if (unlikely(msg_non_seq(msg))) {
- if (msg_user(msg) == LINK_CONFIG)
- tipc_disc_rcv(net, skb, b_ptr);
- else
- tipc_bclink_rcv(net, skb);
- continue;
- }
-
- /* Discard unicast link messages destined for another node */
- if (unlikely(!msg_short(msg) &&
- (msg_destnode(msg) != tn->own_addr)))
- goto discard;
-
- /* Locate neighboring node that sent message */
- n_ptr = tipc_node_find(net, msg_prevnode(msg));
- if (unlikely(!n_ptr))
- goto discard;
-
- tipc_node_lock(n_ptr);
- /* Locate unicast link endpoint that should handle message */
- l_ptr = n_ptr->links[b_ptr->identity].link;
- if (unlikely(!l_ptr))
- goto unlock;
-
- /* Is reception of this pkt permitted at the moment ? */
- if (!tipc_node_filter_skb(n_ptr, msg))
- goto unlock;
-
- /* Validate message sequence number info */
- seq_no = msg_seqno(msg);
- ackd = msg_ack(msg);
-
- /* Release acked messages */
- if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg)))
- tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
-
- released = 0;
- skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) {
- if (more(buf_seqno(skb1), ackd))
- break;
- __skb_unlink(skb1, &l_ptr->transmq);
- kfree_skb(skb1);
- released = 1;
- }
-
- /* Try sending any messages link endpoint has pending */
- if (unlikely(skb_queue_len(&l_ptr->backlogq)))
- tipc_link_push_packets(l_ptr);
-
- if (released && !skb_queue_empty(&l_ptr->wakeupq))
- link_prepare_wakeup(l_ptr);
-
- /* Process the incoming packet */
- if (unlikely(!link_working(l_ptr))) {
- if (msg_user(msg) == LINK_PROTOCOL) {
- tipc_link_proto_rcv(l_ptr, skb);
- link_retrieve_defq(l_ptr, &head);
- skb = NULL;
- goto unlock;
- }
-
- /* Traffic message. Conditionally activate link */
- link_state_event(l_ptr, TRAFFIC_EVT);
-
- if (link_working(l_ptr)) {
- /* Re-insert buffer in front of queue */
- __skb_queue_head(&head, skb);
- skb = NULL;
- goto unlock;
- }
- goto unlock;
- }
-
- /* Link is now in state TIPC_LINK_WORKING */
- if (unlikely(seq_no != l_ptr->rcv_nxt)) {
- link_handle_out_of_seq_msg(l_ptr, skb);
- link_retrieve_defq(l_ptr, &head);
- skb = NULL;
- goto unlock;
- }
- l_ptr->silent_intv_cnt = 0;
-
- /* Synchronize with parallel link if applicable */
- if (unlikely((l_ptr->exec_mode == TIPC_LINK_TUNNEL) &&
- !msg_dup(msg))) {
- if (!link_synch(l_ptr))
- goto unlock;
- }
- l_ptr->rcv_nxt++;
- if (unlikely(!skb_queue_empty(&l_ptr->deferdq)))
- link_retrieve_defq(l_ptr, &head);
- if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
- l_ptr->stats.sent_acks++;
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
- }
- tipc_link_input(l_ptr, skb);
- skb = NULL;
-unlock:
- tipc_node_unlock(n_ptr);
- tipc_node_put(n_ptr);
-discard:
- if (unlikely(skb))
- kfree_skb(skb);
- }
-}
-
/* tipc_data_input - deliver data and name distr msgs to upper layer
*
* Consumes buffer if message is of right type
struct sk_buff *iskb;
int pos = 0;
- if (likely(tipc_data_input(link, skb)))
- return;
-
switch (msg_user(msg)) {
case TUNNEL_PROTOCOL:
if (msg_dup(msg)) {
};
}
+static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
+{
+ bool released = false;
+ struct sk_buff *skb, *tmp;
+
+ skb_queue_walk_safe(&l->transmq, skb, tmp) {
+ if (more(buf_seqno(skb), acked))
+ break;
+ __skb_unlink(skb, &l->transmq);
+ kfree_skb(skb);
+ released = true;
+ }
+ return released;
+}
+
+/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
+ * @link: the link that should handle the message
+ * @skb: TIPC packet
+ * @xmitq: queue to place packets to be sent after this call
+ */
+int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *xmitq)
+{
+ struct sk_buff_head *arrvq = &l->deferdq;
+ struct sk_buff *tmp;
+ struct tipc_msg *hdr;
+ u16 seqno, rcv_nxt;
+ int rc = 0;
+
+ if (unlikely(!__tipc_skb_queue_sorted(arrvq, skb))) {
+ if (!(skb_queue_len(arrvq) % TIPC_NACK_INTV))
+ tipc_link_build_proto_msg(l, STATE_MSG, 0,
+ 0, 0, 0, xmitq);
+ return rc;
+ }
+
+ skb_queue_walk_safe(arrvq, skb, tmp) {
+ hdr = buf_msg(skb);
+
+ /* Verify and update link state */
+ if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) {
+ __skb_dequeue(arrvq);
+ rc |= tipc_link_proto_rcv(l, skb, xmitq);
+ continue;
+ }
+
+ if (unlikely(!link_working(l))) {
+ rc |= tipc_link_fsm_evt(l, TRAFFIC_EVT, xmitq);
+ if (!link_working(l)) {
+ kfree_skb(__skb_dequeue(arrvq));
+ return rc;
+ }
+ }
+
+ l->silent_intv_cnt = 0;
+
+ /* Forward queues and wake up waiting users */
+ if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
+ tipc_link_advance_backlog(l, xmitq);
+ if (unlikely(!skb_queue_empty(&l->wakeupq)))
+ link_prepare_wakeup(l);
+ }
+
+ /* Defer reception if there is a gap in the sequence */
+ seqno = msg_seqno(hdr);
+ rcv_nxt = l->rcv_nxt;
+ if (unlikely(less(rcv_nxt, seqno))) {
+ l->stats.deferred_recv++;
+ return rc;
+ }
+
+ __skb_dequeue(arrvq);
+
+ /* Drop if packet already received */
+ if (unlikely(more(rcv_nxt, seqno))) {
+ l->stats.duplicates++;
+ kfree_skb(skb);
+ return rc;
+ }
+
+ /* Synchronize with parallel link if applicable */
+ if (unlikely(l->exec_mode == TIPC_LINK_TUNNEL))
+ if (!msg_dup(hdr) && !link_synch(l)) {
+ kfree_skb(skb);
+ return rc;
+ }
+
+ /* Packet can be delivered */
+ l->rcv_nxt++;
+ l->stats.recv_info++;
+ if (unlikely(!tipc_data_input(l, skb)))
+ tipc_link_input(l, skb);
+
+ /* Ack at regular intervals */
+ if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
+ l->rcv_unacked = 0;
+ l->stats.sent_acks++;
+ tipc_link_build_proto_msg(l, STATE_MSG,
+ 0, 0, 0, 0, xmitq);
+ }
+ }
+ return rc;
+}
+
/**
* tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue
*
return 1;
}
-/*
- * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
- */
-static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
- struct sk_buff *buf)
-{
- u32 seq_no = buf_seqno(buf);
-
- if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
- tipc_link_proto_rcv(l_ptr, buf);
- return;
- }
-
- /* Record OOS packet arrival */
- l_ptr->silent_intv_cnt = 0;
-
- /*
- * Discard packet if a duplicate; otherwise add it to deferred queue
- * and notify peer of gap as per protocol specification
- */
- if (less(seq_no, l_ptr->rcv_nxt)) {
- l_ptr->stats.duplicates++;
- kfree_skb(buf);
- return;
- }
-
- if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) {
- l_ptr->stats.deferred_recv++;
- if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1)
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
- } else {
- l_ptr->stats.duplicates++;
- }
-}
-
/*
* Send protocol message to the other endpoint.
*/
kfree_skb(skb);
}
-/*
- * Receive protocol message :
- * Note that network plane id propagates through the network, and may
- * change at any time. The node with lowest address rules
- */
-static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
- struct sk_buff *buf)
-{
- u32 rec_gap = 0;
- u32 msg_tol;
- struct tipc_msg *msg = buf_msg(buf);
-
- if (l_ptr->exec_mode == TIPC_LINK_BLOCKED)
- goto exit;
-
- if (l_ptr->net_plane != msg_net_plane(msg))
- if (link_own_addr(l_ptr) > msg_prevnode(msg))
- l_ptr->net_plane = msg_net_plane(msg);
-
- switch (msg_type(msg)) {
-
- case RESET_MSG:
- if (!link_probing(l_ptr) &&
- (l_ptr->peer_session != WILDCARD_SESSION)) {
- if (less_eq(msg_session(msg), l_ptr->peer_session))
- break; /* duplicate or old reset: ignore */
- }
- link_state_event(l_ptr, RESET_MSG);
-
- /* fall thru' */
- case ACTIVATE_MSG:
- /* Update link settings according other endpoint's values */
- strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
-
- msg_tol = msg_link_tolerance(msg);
- if (msg_tol > l_ptr->tolerance)
- l_ptr->tolerance = msg_tol;
-
- if (msg_linkprio(msg) > l_ptr->priority)
- l_ptr->priority = msg_linkprio(msg);
-
- if (l_ptr->mtu > msg_max_pkt(msg))
- l_ptr->mtu = msg_max_pkt(msg);
-
- /* Synchronize broadcast link info, if not done previously */
- if (!tipc_node_is_up(l_ptr->owner)) {
- l_ptr->owner->bclink.last_sent =
- l_ptr->owner->bclink.last_in =
- msg_last_bcast(msg);
- l_ptr->owner->bclink.oos_state = 0;
- }
-
- l_ptr->peer_session = msg_session(msg);
- l_ptr->peer_bearer_id = msg_bearer_id(msg);
-
- if (!msg_peer_is_up(msg))
- tipc_node_fsm_evt(l_ptr->owner, PEER_LOST_CONTACT_EVT);
- if (msg_type(msg) == ACTIVATE_MSG)
- link_state_event(l_ptr, ACTIVATE_MSG);
- break;
- case STATE_MSG:
-
- msg_tol = msg_link_tolerance(msg);
- if (msg_tol)
- l_ptr->tolerance = msg_tol;
-
- if (msg_linkprio(msg) &&
- (msg_linkprio(msg) != l_ptr->priority)) {
- pr_info("%s<%s>, priority change %u->%u\n",
- link_rst_msg, l_ptr->name,
- l_ptr->priority, msg_linkprio(msg));
- l_ptr->priority = msg_linkprio(msg);
- tipc_link_reset(l_ptr);
- break;
- }
-
- /* Record reception; force mismatch at next timeout: */
- l_ptr->silent_intv_cnt = 0;
-
- link_state_event(l_ptr, TRAFFIC_EVT);
- l_ptr->stats.recv_states++;
- if (link_resetting(l_ptr))
- break;
-
- if (less_eq(l_ptr->rcv_nxt, msg_next_sent(msg)))
- rec_gap = mod(msg_next_sent(msg) - l_ptr->rcv_nxt);
-
- if (msg_probe(msg))
- l_ptr->stats.recv_probes++;
-
- /* Protocol message before retransmits, reduce loss risk */
- if (l_ptr->owner->bclink.recv_permitted)
- tipc_bclink_update_link_state(l_ptr->owner,
- msg_last_bcast(msg));
-
- if (rec_gap || (msg_probe(msg)))
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 0,
- rec_gap, 0, 0);
-
- if (msg_seq_gap(msg)) {
- l_ptr->stats.recv_nacks++;
- tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq),
- msg_seq_gap(msg));
- }
- if (tipc_link_is_up(l_ptr))
- tipc_node_fsm_evt(l_ptr->owner,
- PEER_ESTABL_CONTACT_EVT);
- break;
- }
-exit:
- kfree_skb(buf);
-}
-
/* tipc_link_build_proto_msg: prepare link protocol message for transmission
*/
static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
return *skb;
}
+/* tipc_link_proto_rcv(): receive link level protocol message :
+ * Note that network plane id propagates through the network, and may
+ * change at any time. The node with lowest numerical id determines
+ * network plane
+ */
+static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *xmitq)
+{
+ struct tipc_msg *hdr = buf_msg(skb);
+ u16 rcvgap = 0;
+ u16 nacked_gap = msg_seq_gap(hdr);
+ u16 peers_snd_nxt = msg_next_sent(hdr);
+ u16 peers_tol = msg_link_tolerance(hdr);
+ u16 peers_prio = msg_linkprio(hdr);
+ char *if_name;
+ int rc = 0;
+
+ if (l->exec_mode == TIPC_LINK_BLOCKED)
+ goto exit;
+
+ if (link_own_addr(l) > msg_prevnode(hdr))
+ l->net_plane = msg_net_plane(hdr);
+
+ switch (msg_type(hdr)) {
+ case RESET_MSG:
+
+ /* Ignore duplicate RESET with old session number */
+ if ((less_eq(msg_session(hdr), l->peer_session)) &&
+ (l->peer_session != WILDCARD_SESSION))
+ break;
+ /* fall thru' */
+ case ACTIVATE_MSG:
+
+ /* Complete own link name with peer's interface name */
+ if_name = strrchr(l->name, ':') + 1;
+ if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
+ break;
+ if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
+ break;
+ strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME);
+
+ /* Update own tolerance if peer indicates a non-zero value */
+ if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
+ l->tolerance = peers_tol;
+
+ /* Update own priority if peer's priority is higher */
+ if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
+ l->priority = peers_prio;
+
+ l->peer_session = msg_session(hdr);
+ l->peer_bearer_id = msg_bearer_id(hdr);
+ rc = tipc_link_fsm_evt(l, msg_type(hdr), xmitq);
+ if (l->mtu > msg_max_pkt(hdr))
+ l->mtu = msg_max_pkt(hdr);
+ break;
+ case STATE_MSG:
+ /* Update own tolerance if peer indicates a non-zero value */
+ if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
+ l->tolerance = peers_tol;
+
+ l->silent_intv_cnt = 0;
+ l->stats.recv_states++;
+ if (msg_probe(hdr))
+ l->stats.recv_probes++;
+ rc = tipc_link_fsm_evt(l, TRAFFIC_EVT, xmitq);
+ if (!tipc_link_is_up(l))
+ break;
+
+ /* Has peer sent packets we haven't received yet ? */
+ if (more(peers_snd_nxt, l->rcv_nxt))
+ rcvgap = peers_snd_nxt - l->rcv_nxt;
+ if (rcvgap || (msg_probe(hdr)))
+ tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
+ 0, l->mtu, xmitq);
+ tipc_link_release_pkts(l, msg_ack(hdr));
+
+ /* If NACK, retransmit will now start at right position */
+ if (nacked_gap) {
+ rc |= tipc_link_retransm(l, nacked_gap, xmitq);
+ l->stats.recv_nacks++;
+ }
+ tipc_link_advance_backlog(l, xmitq);
+ if (unlikely(!skb_queue_empty(&l->wakeupq)))
+ link_prepare_wakeup(l);
+ }
+exit:
+ kfree_skb(skb);
+ return rc;
+}
+
void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
{
int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE);
projects / linux-beck.git / commitdiff