/*
* Error message prefixes
*/
-static const char *link_co_err = "Link changeover error, ";
+static const char *link_co_err = "Link tunneling error, ";
static const char *link_rst_msg = "Resetting link ";
-static const char *link_unk_evt = "Unknown link event ";
static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
[TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
*/
#define WILDCARD_SESSION 0x10000
-/* State value stored in 'failover_pkts'
+/* Link FSM states:
*/
-#define FIRST_FAILOVER 0xffffu
-
-/* Link FSM states and events:
- */
-enum {
- TIPC_LINK_WORKING,
- TIPC_LINK_PROBING,
- TIPC_LINK_RESETTING,
- TIPC_LINK_ESTABLISHING
-};
-
enum {
- PEER_RESET_EVT = RESET_MSG,
- ACTIVATE_EVT = ACTIVATE_MSG,
- TRAFFIC_EVT, /* Any other valid msg from peer */
- SILENCE_EVT /* Peer was silent during last timer interval*/
+ LINK_ESTABLISHED = 0xe,
+ LINK_ESTABLISHING = 0xe << 4,
+ LINK_RESET = 0x1 << 8,
+ LINK_RESETTING = 0x2 << 12,
+ LINK_PEER_RESET = 0xd << 16,
+ LINK_FAILINGOVER = 0xf << 20,
+ LINK_SYNCHING = 0xc << 24
};
/* Link FSM state checking routines
*/
-static int link_working(struct tipc_link *l)
+static int link_is_up(struct tipc_link *l)
{
- return l->state == TIPC_LINK_WORKING;
-}
-
-static int link_probing(struct tipc_link *l)
-{
- return l->state == TIPC_LINK_PROBING;
-}
-
-static int link_resetting(struct tipc_link *l)
-{
- return l->state == TIPC_LINK_RESETTING;
-}
-
-static int link_establishing(struct tipc_link *l)
-{
- return l->state == TIPC_LINK_ESTABLISHING;
+ return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
}
static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
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_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);
/*
- * Simple link routines
+ * Simple non-static link routines (i.e. referenced outside this file)
*/
-static unsigned int align(unsigned int i)
+bool tipc_link_is_up(struct tipc_link *l)
{
- return (i + 3) & ~3u;
+ return link_is_up(l);
}
-static struct tipc_link *tipc_parallel_link(struct tipc_link *l)
+bool tipc_link_is_reset(struct tipc_link *l)
{
- struct tipc_node *n = l->owner;
+ return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
+}
- if (node_active_link(n, 0) != l)
- return node_active_link(n, 0);
- return node_active_link(n, 1);
+bool tipc_link_is_synching(struct tipc_link *l)
+{
+ return l->state == LINK_SYNCHING;
}
-/*
- * Simple non-static link routines (i.e. referenced outside this file)
- */
-int tipc_link_is_up(struct tipc_link *l_ptr)
+bool tipc_link_is_failingover(struct tipc_link *l)
{
- if (!l_ptr)
- return 0;
- return link_working(l_ptr) || link_probing(l_ptr);
+ return l->state == LINK_FAILINGOVER;
+}
+
+bool tipc_link_is_blocked(struct tipc_link *l)
+{
+ return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
}
int tipc_link_is_active(struct tipc_link *l)
return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l);
}
-/**
- * tipc_link_create - create a new link
- * @n_ptr: pointer to associated node
- * @b_ptr: pointer to associated bearer
- * @media_addr: media address to use when sending messages over link
- *
- * Returns pointer to link.
- */
-struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
- struct tipc_bearer *b_ptr,
- const struct tipc_media_addr *media_addr,
- struct sk_buff_head *inputq,
- struct sk_buff_head *namedq)
+static u32 link_own_addr(struct tipc_link *l)
{
- struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
- struct tipc_link *l_ptr;
- struct tipc_msg *msg;
- char *if_name;
- char addr_string[16];
- u32 peer = n_ptr->addr;
-
- if (n_ptr->link_cnt >= MAX_BEARERS) {
- tipc_addr_string_fill(addr_string, n_ptr->addr);
- pr_err("Cannot establish %uth link to %s. Max %u allowed.\n",
- n_ptr->link_cnt, addr_string, MAX_BEARERS);
- return NULL;
- }
-
- if (n_ptr->links[b_ptr->identity].link) {
- tipc_addr_string_fill(addr_string, n_ptr->addr);
- pr_err("Attempt to establish second link on <%s> to %s\n",
- b_ptr->name, addr_string);
- return NULL;
- }
-
- l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
- if (!l_ptr) {
- pr_warn("Link creation failed, no memory\n");
- return NULL;
- }
- l_ptr->addr = peer;
- if_name = strchr(b_ptr->name, ':') + 1;
- sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
- tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr),
- tipc_node(tn->own_addr),
- if_name,
- tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
- /* note: peer i/f name is updated by reset/activate message */
- memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
- l_ptr->owner = n_ptr;
- l_ptr->peer_session = WILDCARD_SESSION;
- l_ptr->bearer_id = b_ptr->identity;
- l_ptr->tolerance = b_ptr->tolerance;
- l_ptr->state = TIPC_LINK_RESETTING;
-
- l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
- msg = l_ptr->pmsg;
- tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE,
- l_ptr->addr);
- msg_set_size(msg, sizeof(l_ptr->proto_msg));
- msg_set_session(msg, (tn->random & 0xffff));
- msg_set_bearer_id(msg, b_ptr->identity);
- strcpy((char *)msg_data(msg), if_name);
- l_ptr->net_plane = b_ptr->net_plane;
- l_ptr->advertised_mtu = b_ptr->mtu;
- l_ptr->mtu = l_ptr->advertised_mtu;
- l_ptr->priority = b_ptr->priority;
- tipc_link_set_queue_limits(l_ptr, b_ptr->window);
- l_ptr->snd_nxt = 1;
- __skb_queue_head_init(&l_ptr->transmq);
- __skb_queue_head_init(&l_ptr->backlogq);
- __skb_queue_head_init(&l_ptr->deferdq);
- skb_queue_head_init(&l_ptr->wakeupq);
- l_ptr->inputq = inputq;
- l_ptr->namedq = namedq;
- skb_queue_head_init(l_ptr->inputq);
- link_reset_statistics(l_ptr);
- tipc_node_attach_link(n_ptr, l_ptr);
- return l_ptr;
+ return msg_prevnode(l->pmsg);
}
/**
- * tipc_link_delete - Delete a link
- * @l: link to be deleted
+ * tipc_link_create - create a new link
+ * @n: pointer to associated node
+ * @b: pointer to associated bearer
+ * @ownnode: identity of own node
+ * @peer: identity of peer node
+ * @maddr: media address to be used
+ * @inputq: queue to put messages ready for delivery
+ * @namedq: queue to put binding table update messages ready for delivery
+ * @link: return value, pointer to put the created link
+ *
+ * Returns true if link was created, otherwise false
*/
-void tipc_link_delete(struct tipc_link *l)
-{
- tipc_link_reset(l);
- tipc_link_reset_fragments(l);
- tipc_node_detach_link(l->owner, l);
-}
-
-void tipc_link_delete_list(struct net *net, unsigned int bearer_id)
+bool tipc_link_create(struct tipc_node *n, struct tipc_bearer *b, u32 session,
+ u32 ownnode, u32 peer, struct tipc_media_addr *maddr,
+ struct sk_buff_head *inputq, struct sk_buff_head *namedq,
+ struct tipc_link **link)
{
- struct tipc_net *tn = net_generic(net, tipc_net_id);
- struct tipc_link *link;
- struct tipc_node *node;
+ struct tipc_link *l;
+ struct tipc_msg *hdr;
+ char *if_name;
- rcu_read_lock();
- list_for_each_entry_rcu(node, &tn->node_list, list) {
- tipc_node_lock(node);
- link = node->links[bearer_id].link;
- if (link)
- tipc_link_delete(link);
- tipc_node_unlock(node);
- }
- rcu_read_unlock();
+ l = kzalloc(sizeof(*l), GFP_ATOMIC);
+ if (!l)
+ return false;
+ *link = l;
+
+ /* Note: peer i/f name is completed by reset/activate message */
+ if_name = strchr(b->name, ':') + 1;
+ sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
+ tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode),
+ if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
+
+ l->addr = peer;
+ l->media_addr = maddr;
+ l->owner = n;
+ l->peer_session = WILDCARD_SESSION;
+ l->bearer_id = b->identity;
+ l->tolerance = b->tolerance;
+ l->net_plane = b->net_plane;
+ l->advertised_mtu = b->mtu;
+ l->mtu = b->mtu;
+ l->priority = b->priority;
+ tipc_link_set_queue_limits(l, b->window);
+ l->inputq = inputq;
+ l->namedq = namedq;
+ l->state = LINK_RESETTING;
+ l->pmsg = (struct tipc_msg *)&l->proto_msg;
+ hdr = l->pmsg;
+ tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer);
+ msg_set_size(hdr, sizeof(l->proto_msg));
+ msg_set_session(hdr, session);
+ msg_set_bearer_id(hdr, l->bearer_id);
+ strcpy((char *)msg_data(hdr), if_name);
+ __skb_queue_head_init(&l->transmq);
+ __skb_queue_head_init(&l->backlogq);
+ __skb_queue_head_init(&l->deferdq);
+ skb_queue_head_init(&l->wakeupq);
+ skb_queue_head_init(l->inputq);
+ return true;
}
/* 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)
+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;
+ u16 last_sent;
skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
0, l->addr, link_own_addr(l), 0, 0, 0);
if (!skb)
return;
+ last_sent = tipc_bclink_get_last_sent(l->owner->net);
+ msg_set_last_bcast(buf_msg(skb), last_sent);
__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
* @evt: state machine event to be processed
- * @xmitq: queue to prepend created protocol message, if any
*/
-static int tipc_link_fsm_evt(struct tipc_link *l, int evt,
- struct sk_buff_head *xmitq)
+int tipc_link_fsm_evt(struct tipc_link *l, int evt)
{
- 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),
- SND_BCAST_SYNC = (1 << 6)
- } actions = 0;
-
- if (l->exec_mode == TIPC_LINK_BLOCKED)
- return rc;
+ int rc = 0;
switch (l->state) {
- case TIPC_LINK_WORKING:
+ case LINK_RESETTING:
switch (evt) {
- case TRAFFIC_EVT:
- case ACTIVATE_EVT:
+ case LINK_PEER_RESET_EVT:
+ l->state = LINK_PEER_RESET;
+ break;
+ case LINK_RESET_EVT:
+ l->state = LINK_RESET;
break;
- case SILENCE_EVT:
- l->state = TIPC_LINK_PROBING;
- actions |= SND_PROBE;
+ case LINK_FAILURE_EVT:
+ case LINK_FAILOVER_BEGIN_EVT:
+ case LINK_ESTABLISH_EVT:
+ case LINK_FAILOVER_END_EVT:
+ case LINK_SYNCH_BEGIN_EVT:
+ case LINK_SYNCH_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case LINK_RESET:
+ switch (evt) {
+ case LINK_PEER_RESET_EVT:
+ l->state = LINK_ESTABLISHING;
break;
- case PEER_RESET_EVT:
- actions |= LINK_RESET | SND_ACTIVATE;
+ case LINK_FAILOVER_BEGIN_EVT:
+ l->state = LINK_FAILINGOVER;
+ case LINK_FAILURE_EVT:
+ case LINK_RESET_EVT:
+ case LINK_ESTABLISH_EVT:
+ case LINK_FAILOVER_END_EVT:
break;
+ case LINK_SYNCH_BEGIN_EVT:
+ case LINK_SYNCH_END_EVT:
default:
- pr_debug("%s%u WORKING\n", link_unk_evt, evt);
+ goto illegal_evt;
}
break;
- case TIPC_LINK_PROBING:
+ case LINK_PEER_RESET:
switch (evt) {
- case TRAFFIC_EVT:
- case ACTIVATE_EVT:
- l->state = TIPC_LINK_WORKING;
+ case LINK_RESET_EVT:
+ l->state = LINK_ESTABLISHING;
break;
- case PEER_RESET_EVT:
- actions |= LINK_RESET | SND_ACTIVATE;
+ case LINK_PEER_RESET_EVT:
+ case LINK_ESTABLISH_EVT:
+ case LINK_FAILURE_EVT:
break;
- case SILENCE_EVT:
- if (l->silent_intv_cnt <= l->abort_limit) {
- actions |= SND_PROBE;
- break;
- }
- actions |= LINK_RESET | SND_RESET;
+ case LINK_SYNCH_BEGIN_EVT:
+ case LINK_SYNCH_END_EVT:
+ case LINK_FAILOVER_BEGIN_EVT:
+ case LINK_FAILOVER_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case LINK_FAILINGOVER:
+ switch (evt) {
+ case LINK_FAILOVER_END_EVT:
+ l->state = LINK_RESET;
break;
+ case LINK_PEER_RESET_EVT:
+ case LINK_RESET_EVT:
+ case LINK_ESTABLISH_EVT:
+ case LINK_FAILURE_EVT:
+ break;
+ case LINK_FAILOVER_BEGIN_EVT:
+ case LINK_SYNCH_BEGIN_EVT:
+ case LINK_SYNCH_END_EVT:
default:
- pr_err("%s%u PROBING\n", link_unk_evt, evt);
+ goto illegal_evt;
}
break;
- case TIPC_LINK_RESETTING:
+ case LINK_ESTABLISHING:
switch (evt) {
- case TRAFFIC_EVT:
+ case LINK_ESTABLISH_EVT:
+ l->state = LINK_ESTABLISHED;
+ rc |= TIPC_LINK_UP_EVT;
break;
- case ACTIVATE_EVT:
- pl = node_active_link(l->owner, 0);
- if (pl && link_probing(pl))
- break;
- actions |= LINK_ACTIVATE;
- if (!l->owner->working_links)
- actions |= SND_BCAST_SYNC;
+ case LINK_FAILOVER_BEGIN_EVT:
+ l->state = LINK_FAILINGOVER;
+ break;
+ case LINK_PEER_RESET_EVT:
+ case LINK_RESET_EVT:
+ case LINK_FAILURE_EVT:
+ case LINK_SYNCH_BEGIN_EVT:
+ case LINK_FAILOVER_END_EVT:
+ break;
+ case LINK_SYNCH_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case LINK_ESTABLISHED:
+ switch (evt) {
+ case LINK_PEER_RESET_EVT:
+ l->state = LINK_PEER_RESET;
+ rc |= TIPC_LINK_DOWN_EVT;
+ break;
+ case LINK_FAILURE_EVT:
+ l->state = LINK_RESETTING;
+ rc |= TIPC_LINK_DOWN_EVT;
+ break;
+ case LINK_RESET_EVT:
+ l->state = LINK_RESET;
break;
- case PEER_RESET_EVT:
- l->state = TIPC_LINK_ESTABLISHING;
- actions |= SND_ACTIVATE;
+ case LINK_ESTABLISH_EVT:
+ case LINK_SYNCH_END_EVT:
break;
- case SILENCE_EVT:
- actions |= SND_RESET;
+ case LINK_SYNCH_BEGIN_EVT:
+ l->state = LINK_SYNCHING;
break;
+ case LINK_FAILOVER_BEGIN_EVT:
+ case LINK_FAILOVER_END_EVT:
default:
- pr_err("%s%u in RESETTING\n", link_unk_evt, evt);
+ goto illegal_evt;
}
break;
- case TIPC_LINK_ESTABLISHING:
+ case LINK_SYNCHING:
switch (evt) {
- case TRAFFIC_EVT:
- case ACTIVATE_EVT:
- pl = node_active_link(l->owner, 0);
- if (pl && link_probing(pl))
- break;
- actions |= LINK_ACTIVATE;
- if (!l->owner->working_links)
- actions |= SND_BCAST_SYNC;
+ case LINK_PEER_RESET_EVT:
+ l->state = LINK_PEER_RESET;
+ rc |= TIPC_LINK_DOWN_EVT;
+ break;
+ case LINK_FAILURE_EVT:
+ l->state = LINK_RESETTING;
+ rc |= TIPC_LINK_DOWN_EVT;
break;
- case PEER_RESET_EVT:
+ case LINK_RESET_EVT:
+ l->state = LINK_RESET;
break;
- case SILENCE_EVT:
- actions |= SND_ACTIVATE;
+ case LINK_ESTABLISH_EVT:
+ case LINK_SYNCH_BEGIN_EVT:
break;
+ case LINK_SYNCH_END_EVT:
+ l->state = LINK_ESTABLISHED;
+ break;
+ case LINK_FAILOVER_BEGIN_EVT:
+ case LINK_FAILOVER_END_EVT:
default:
- pr_err("%s%u ESTABLISHING\n", link_unk_evt, evt);
+ goto illegal_evt;
}
break;
default:
- pr_err("Unknown link state %u/%u\n", l->state, evt);
- }
-
- /* Perform actions as decided by FSM */
- if (actions & LINK_RESET) {
- l->exec_mode = TIPC_LINK_BLOCKED;
- rc |= TIPC_LINK_DOWN_EVT;
- }
- if (actions & LINK_ACTIVATE) {
- l->exec_mode = TIPC_LINK_OPEN;
- rc |= TIPC_LINK_UP_EVT;
+ pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
}
- if (actions & (SND_STATE | SND_PROBE))
- mtyp = STATE_MSG;
- if (actions & SND_RESET)
- mtyp = RESET_MSG;
- if (actions & SND_ACTIVATE)
- mtyp = ACTIVATE_MSG;
- 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;
+illegal_evt:
+ pr_err("Illegal FSM event %x in state %x on link %s\n",
+ evt, l->state, l->name);
return rc;
}
int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
{
int rc = 0;
+ int mtyp = STATE_MSG;
+ bool xmit = false;
+ bool prb = false;
link_profile_stats(l);
- if (l->silent_intv_cnt)
- rc = tipc_link_fsm_evt(l, SILENCE_EVT, xmitq);
- else if (link_working(l) && tipc_bclink_acks_missing(l->owner))
- tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
- l->silent_intv_cnt++;
+
+ switch (l->state) {
+ case LINK_ESTABLISHED:
+ case LINK_SYNCHING:
+ if (!l->silent_intv_cnt) {
+ if (tipc_bclink_acks_missing(l->owner))
+ xmit = true;
+ } else if (l->silent_intv_cnt <= l->abort_limit) {
+ xmit = true;
+ prb = true;
+ } else {
+ rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
+ }
+ l->silent_intv_cnt++;
+ break;
+ case LINK_RESET:
+ xmit = true;
+ mtyp = RESET_MSG;
+ break;
+ case LINK_ESTABLISHING:
+ xmit = true;
+ mtyp = ACTIVATE_MSG;
+ break;
+ case LINK_PEER_RESET:
+ case LINK_RESETTING:
+ case LINK_FAILINGOVER:
+ break;
+ default:
+ break;
+ }
+
+ if (xmit)
+ tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq);
+
return rc;
}
break;
skb_unlink(skb, &l->wakeupq);
skb_queue_tail(l->inputq, skb);
- l->owner->inputq = l->inputq;
- l->owner->action_flags |= TIPC_MSG_EVT;
}
}
tipc_link_reset_fragments(l_ptr);
}
-void tipc_link_reset(struct tipc_link *l_ptr)
+void tipc_link_reset(struct tipc_link *l)
{
- u32 prev_state = l_ptr->state;
- int was_active_link = tipc_link_is_active(l_ptr);
- struct tipc_node *owner = l_ptr->owner;
- struct tipc_link *pl = tipc_parallel_link(l_ptr);
-
- msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
+ tipc_link_fsm_evt(l, LINK_RESET_EVT);
/* Link is down, accept any session */
- l_ptr->peer_session = WILDCARD_SESSION;
-
- /* Prepare for renewed mtu size negotiation */
- l_ptr->mtu = l_ptr->advertised_mtu;
-
- l_ptr->state = TIPC_LINK_RESETTING;
-
- if ((prev_state == TIPC_LINK_RESETTING) ||
- (prev_state == TIPC_LINK_ESTABLISHING))
- return;
-
- tipc_node_link_down(l_ptr->owner, l_ptr->bearer_id);
- tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr);
-
- if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) {
- l_ptr->exec_mode = TIPC_LINK_BLOCKED;
- l_ptr->failover_checkpt = l_ptr->rcv_nxt;
- pl->failover_pkts = FIRST_FAILOVER;
- pl->failover_checkpt = l_ptr->rcv_nxt;
- pl->failover_skb = l_ptr->reasm_buf;
- } else {
- kfree_skb(l_ptr->reasm_buf);
- }
- /* Clean up all queues, except inputq: */
- __skb_queue_purge(&l_ptr->transmq);
- __skb_queue_purge(&l_ptr->deferdq);
- if (!owner->inputq)
- owner->inputq = l_ptr->inputq;
- skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq);
- if (!skb_queue_empty(owner->inputq))
- owner->action_flags |= TIPC_MSG_EVT;
- tipc_link_purge_backlog(l_ptr);
- 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);
-}
+ l->peer_session = WILDCARD_SESSION;
-void tipc_link_activate(struct tipc_link *link)
-{
- struct tipc_node *node = link->owner;
+ /* If peer is up, it only accepts an incremented session number */
+ msg_set_session(l->pmsg, msg_session(l->pmsg) + 1);
- link->rcv_nxt = 1;
- link->stats.recv_info = 1;
- link->silent_intv_cnt = 0;
- link->state = TIPC_LINK_WORKING;
- link->exec_mode = TIPC_LINK_OPEN;
- tipc_node_link_up(node, link->bearer_id);
- tipc_bearer_add_dest(node->net, link->bearer_id, link->addr);
+ /* Prepare for renewed mtu size negotiation */
+ l->mtu = l->advertised_mtu;
+
+ /* Clean up all queues: */
+ __skb_queue_purge(&l->transmq);
+ __skb_queue_purge(&l->deferdq);
+ skb_queue_splice_init(&l->wakeupq, l->inputq);
+
+ tipc_link_purge_backlog(l);
+ kfree_skb(l->reasm_buf);
+ kfree_skb(l->failover_reasm_skb);
+ l->reasm_buf = NULL;
+ l->failover_reasm_skb = NULL;
+ l->rcv_unacked = 0;
+ l->snd_nxt = 1;
+ l->rcv_nxt = 1;
+ l->silent_intv_cnt = 0;
+ l->stats.recv_info = 0;
+ l->stale_count = 0;
+ link_reset_statistics(l);
}
/**
u16 ack = mod(link->rcv_nxt - 1);
u16 seqno = link->snd_nxt;
u16 bc_last_in = link->owner->bclink.last_in;
- struct tipc_media_addr *addr = &link->media_addr;
+ struct tipc_media_addr *addr = link->media_addr;
struct sk_buff_head *transmq = &link->transmq;
struct sk_buff_head *backlogq = &link->backlogq;
struct sk_buff *skb, *bskb;
return 0;
}
-static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)
-{
- skb_queue_head_init(list);
- __skb_queue_tail(list, skb);
-}
-
-static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb)
-{
- struct sk_buff_head head;
-
- skb2list(skb, &head);
- return __tipc_link_xmit(link->owner->net, link, &head);
-}
-
/*
* tipc_link_sync_rcv - synchronize broadcast link endpoints.
* Receive the sequence number where we should start receiving and
link->rcv_unacked = 0;
__skb_queue_tail(&link->transmq, skb);
tipc_bearer_send(link->owner->net, link->bearer_id,
- skb, &link->media_addr);
+ skb, link->media_addr);
}
link->snd_nxt = seqno;
}
l->snd_nxt = seqno;
}
-void tipc_link_reset_all(struct tipc_node *node)
-{
- char addr_string[16];
- u32 i;
-
- tipc_node_lock(node);
-
- pr_warn("Resetting all links to %s\n",
- tipc_addr_string_fill(addr_string, node->addr));
-
- for (i = 0; i < MAX_BEARERS; i++) {
- if (node->links[i].link) {
- link_print(node->links[i].link, "Resetting link\n");
- tipc_link_reset(node->links[i].link);
- }
- }
-
- tipc_node_unlock(node);
-}
-
static void link_retransmit_failure(struct tipc_link *l_ptr,
struct sk_buff *buf)
{
msg_errcode(msg));
pr_info("sqno %u, prev: %x, src: %x\n",
msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg));
- tipc_link_reset(l_ptr);
} else {
/* Handle failure on broadcast link */
struct tipc_node *n_ptr;
msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1));
msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb,
- &l_ptr->media_addr);
+ l_ptr->media_addr);
retransmits--;
l_ptr->stats.retransmitted++;
}
l->stale_count = 1;
} else if (++l->stale_count > 100) {
link_retransmit_failure(l, skb);
- return TIPC_LINK_DOWN_EVT;
+ return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
}
skb_queue_walk(&l->transmq, skb) {
if (!retransm)
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
- */
-static bool link_synch(struct tipc_link *l)
-{
- unsigned int post_synch;
- struct tipc_link *pl;
-
- pl = tipc_parallel_link(l);
- if (pl == l)
- goto synched;
-
- /* Was last pre-synch packet added to input queue ? */
- if (less_eq(pl->rcv_nxt, l->synch_point))
- return false;
-
- /* Is it still in the input queue ? */
- post_synch = mod(pl->rcv_nxt - l->synch_point) - 1;
- if (skb_queue_len(pl->inputq) > post_synch)
- return false;
-synched:
- l->exec_mode = TIPC_LINK_OPEN;
- return true;
-}
-
/* tipc_data_input - deliver data and name distr msgs to upper layer
*
* Consumes buffer if message is of right type
* Node lock must be held
*/
-static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb)
+static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb,
+ struct sk_buff_head *inputq)
{
struct tipc_node *node = link->owner;
- struct tipc_msg *msg = buf_msg(skb);
- u32 dport = msg_destport(msg);
- switch (msg_user(msg)) {
+ switch (msg_user(buf_msg(skb))) {
case TIPC_LOW_IMPORTANCE:
case TIPC_MEDIUM_IMPORTANCE:
case TIPC_HIGH_IMPORTANCE:
case TIPC_CRITICAL_IMPORTANCE:
case CONN_MANAGER:
- if (tipc_skb_queue_tail(link->inputq, skb, dport)) {
- node->inputq = link->inputq;
- node->action_flags |= TIPC_MSG_EVT;
- }
+ __skb_queue_tail(inputq, skb);
return true;
case NAME_DISTRIBUTOR:
node->bclink.recv_permitted = true;
- node->namedq = link->namedq;
skb_queue_tail(link->namedq, skb);
- if (skb_queue_len(link->namedq) == 1)
- node->action_flags |= TIPC_NAMED_MSG_EVT;
return true;
case MSG_BUNDLER:
case TUNNEL_PROTOCOL:
/* tipc_link_input - process packet that has passed link protocol check
*
* Consumes buffer
- * Node lock must be held
*/
-static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
+static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *inputq)
{
- struct tipc_node *node = link->owner;
- struct tipc_msg *msg = buf_msg(skb);
+ struct tipc_node *node = l->owner;
+ struct tipc_msg *hdr = buf_msg(skb);
+ struct sk_buff **reasm_skb = &l->reasm_buf;
struct sk_buff *iskb;
+ int usr = msg_user(hdr);
+ int rc = 0;
int pos = 0;
+ int ipos = 0;
- switch (msg_user(msg)) {
- case TUNNEL_PROTOCOL:
- if (msg_dup(msg)) {
- link->exec_mode = TIPC_LINK_TUNNEL;
- link->synch_point = msg_seqno(msg_get_wrapped(msg));
- kfree_skb(skb);
- break;
+ if (unlikely(usr == TUNNEL_PROTOCOL)) {
+ if (msg_type(hdr) == SYNCH_MSG) {
+ __skb_queue_purge(&l->deferdq);
+ goto drop;
}
- if (!tipc_link_failover_rcv(link, &skb))
- break;
- if (msg_user(buf_msg(skb)) != MSG_BUNDLER) {
- tipc_data_input(link, skb);
- break;
- }
- case MSG_BUNDLER:
- link->stats.recv_bundles++;
- link->stats.recv_bundled += msg_msgcnt(msg);
+ if (!tipc_msg_extract(skb, &iskb, &ipos))
+ return rc;
+ kfree_skb(skb);
+ skb = iskb;
+ hdr = buf_msg(skb);
+ if (less(msg_seqno(hdr), l->drop_point))
+ goto drop;
+ if (tipc_data_input(l, skb, inputq))
+ return rc;
+ usr = msg_user(hdr);
+ reasm_skb = &l->failover_reasm_skb;
+ }
+ if (usr == MSG_BUNDLER) {
+ l->stats.recv_bundles++;
+ l->stats.recv_bundled += msg_msgcnt(hdr);
while (tipc_msg_extract(skb, &iskb, &pos))
- tipc_data_input(link, iskb);
- break;
- case MSG_FRAGMENTER:
- link->stats.recv_fragments++;
- if (tipc_buf_append(&link->reasm_buf, &skb)) {
- link->stats.recv_fragmented++;
- tipc_data_input(link, skb);
- } else if (!link->reasm_buf) {
- tipc_link_reset(link);
+ tipc_data_input(l, iskb, inputq);
+ return 0;
+ } else if (usr == MSG_FRAGMENTER) {
+ l->stats.recv_fragments++;
+ if (tipc_buf_append(reasm_skb, &skb)) {
+ l->stats.recv_fragmented++;
+ tipc_data_input(l, skb, inputq);
+ } else if (!*reasm_skb) {
+ return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
}
- break;
- case BCAST_PROTOCOL:
+ return 0;
+ } else if (usr == BCAST_PROTOCOL) {
tipc_link_sync_rcv(node, skb);
- break;
- default:
- break;
- };
+ return 0;
+ }
+drop:
+ kfree_skb(skb);
+ return 0;
}
static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
struct sk_buff_head *xmitq)
{
struct sk_buff_head *arrvq = &l->deferdq;
- struct sk_buff *tmp;
+ struct sk_buff_head tmpq;
struct tipc_msg *hdr;
u16 seqno, rcv_nxt;
int rc = 0;
+ __skb_queue_head_init(&tmpq);
+
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,
return rc;
}
- skb_queue_walk_safe(arrvq, skb, tmp) {
+ while ((skb = skb_peek(arrvq))) {
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);
+ 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)) {
+ if (unlikely(!link_is_up(l))) {
+ rc = tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
+ if (!link_is_up(l)) {
kfree_skb(__skb_dequeue(arrvq));
- return rc;
+ goto exit;
}
}
rcv_nxt = l->rcv_nxt;
if (unlikely(less(rcv_nxt, seqno))) {
l->stats.deferred_recv++;
- return rc;
+ goto exit;
}
__skb_dequeue(arrvq);
if (unlikely(more(rcv_nxt, seqno))) {
l->stats.duplicates++;
kfree_skb(skb);
- return rc;
+ goto exit;
}
- /* 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);
+ if (unlikely(!tipc_data_input(l, skb, &tmpq)))
+ rc = tipc_link_input(l, skb, &tmpq);
/* Ack at regular intervals */
if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
0, 0, 0, 0, xmitq);
}
}
+exit:
+ tipc_skb_queue_splice_tail(&tmpq, l->inputq);
return rc;
}
skb = __skb_dequeue(&xmitq);
if (!skb)
return;
- tipc_bearer_send(l->owner->net, l->bearer_id, skb, &l->media_addr);
+ tipc_bearer_send(l->owner->net, l->bearer_id, skb, l->media_addr);
l->rcv_unacked = 0;
kfree_skb(skb);
}
int node_up = l->owner->bclink.recv_permitted;
/* Don't send protocol message during reset or link failover */
- if (l->exec_mode == TIPC_LINK_BLOCKED)
+ if (tipc_link_is_blocked(l))
return;
msg_set_type(hdr, mtyp);
} else {
/* RESET_MSG or ACTIVATE_MSG */
msg_set_max_pkt(hdr, l->advertised_mtu);
- msg_set_ack(hdr, l->failover_checkpt - 1);
+ msg_set_ack(hdr, l->rcv_nxt - 1);
msg_set_next_sent(hdr, 1);
}
skb = tipc_buf_acquire(msg_size(hdr));
return;
skb_copy_to_linear_data(skb, hdr, msg_size(hdr));
skb->priority = TC_PRIO_CONTROL;
- __skb_queue_head(xmitq, skb);
+ __skb_queue_tail(xmitq, skb);
}
-/* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to
- * a different bearer. Owner node is locked.
+/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets
+ * with contents of the link's tranmsit and backlog queues.
*/
-static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr,
- struct tipc_msg *tunnel_hdr,
- struct tipc_msg *msg,
- u32 selector)
+void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
+ int mtyp, struct sk_buff_head *xmitq)
{
- struct tipc_link *tunnel;
- struct sk_buff *skb;
- u32 length = msg_size(msg);
+ struct sk_buff *skb, *tnlskb;
+ struct tipc_msg *hdr, tnlhdr;
+ struct sk_buff_head *queue = &l->transmq;
+ struct sk_buff_head tmpxq, tnlq;
+ u16 pktlen, pktcnt, seqno = l->snd_nxt;
- tunnel = node_active_link(l_ptr->owner, selector & 1);
- if (!tipc_link_is_up(tunnel)) {
- pr_warn("%stunnel link no longer available\n", link_co_err);
+ if (!tnl)
return;
- }
- msg_set_size(tunnel_hdr, length + INT_H_SIZE);
- skb = tipc_buf_acquire(length + INT_H_SIZE);
- if (!skb) {
- pr_warn("%sunable to send tunnel msg\n", link_co_err);
- return;
- }
- skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE);
- skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length);
- __tipc_link_xmit_skb(tunnel, skb);
-}
-
-
-/* tipc_link_failover_send_queue(): A link has gone down, but a second
- * link is still active. We can do failover. Tunnel the failing link's
- * whole send queue via the remaining link. This way, we don't lose
- * any packets, and sequence order is preserved for subsequent traffic
- * sent over the remaining link. Owner node is locked.
- */
-void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
-{
- int msgcount;
- struct tipc_link *tunnel = node_active_link(l_ptr->owner, 0);
- struct tipc_msg tunnel_hdr;
- struct sk_buff *skb;
- int split_bundles;
- if (!tunnel)
- return;
-
- tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, TUNNEL_PROTOCOL,
- FAILOVER_MSG, INT_H_SIZE, l_ptr->addr);
+ skb_queue_head_init(&tnlq);
+ skb_queue_head_init(&tmpxq);
- skb_queue_walk(&l_ptr->backlogq, skb) {
- msg_set_seqno(buf_msg(skb), l_ptr->snd_nxt);
- l_ptr->snd_nxt = mod(l_ptr->snd_nxt + 1);
- }
- skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq);
- tipc_link_purge_backlog(l_ptr);
- msgcount = skb_queue_len(&l_ptr->transmq);
- msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
- msg_set_msgcnt(&tunnel_hdr, msgcount);
-
- if (skb_queue_empty(&l_ptr->transmq)) {
- skb = tipc_buf_acquire(INT_H_SIZE);
- if (skb) {
- skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE);
- msg_set_size(&tunnel_hdr, INT_H_SIZE);
- __tipc_link_xmit_skb(tunnel, skb);
- } else {
- pr_warn("%sunable to send changeover msg\n",
- link_co_err);
- }
+ /* At least one packet required for safe algorithm => add dummy */
+ skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
+ BASIC_H_SIZE, 0, l->addr, link_own_addr(l),
+ 0, 0, TIPC_ERR_NO_PORT);
+ if (!skb) {
+ pr_warn("%sunable to create tunnel packet\n", link_co_err);
return;
}
-
- split_bundles = (node_active_link(l_ptr->owner, 0) !=
- node_active_link(l_ptr->owner, 0));
-
- skb_queue_walk(&l_ptr->transmq, skb) {
- struct tipc_msg *msg = buf_msg(skb);
-
- if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
- struct tipc_msg *m = msg_get_wrapped(msg);
- unchar *pos = (unchar *)m;
-
- msgcount = msg_msgcnt(msg);
- while (msgcount--) {
- msg_set_seqno(m, msg_seqno(msg));
- tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m,
- msg_link_selector(m));
- pos += align(msg_size(m));
- m = (struct tipc_msg *)pos;
- }
- } else {
- tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg,
- msg_link_selector(msg));
- }
- }
-}
-
-/* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a
- * duplicate of the first link's send queue via the new link. This way, we
- * are guaranteed that currently queued packets from a socket are delivered
- * before future traffic from the same socket, even if this is using the
- * new link. The last arriving copy of each duplicate packet is dropped at
- * the receiving end by the regular protocol check, so packet cardinality
- * and sequence order is preserved per sender/receiver socket pair.
- * Owner node is locked.
- */
-void tipc_link_dup_queue_xmit(struct tipc_link *link,
- struct tipc_link *tnl)
-{
- struct sk_buff *skb;
- struct tipc_msg tnl_hdr;
- struct sk_buff_head *queue = &link->transmq;
- int mcnt;
- u16 seqno;
-
- tipc_msg_init(link_own_addr(link), &tnl_hdr, TUNNEL_PROTOCOL,
- SYNCH_MSG, INT_H_SIZE, link->addr);
- mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq);
- msg_set_msgcnt(&tnl_hdr, mcnt);
- msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id);
-
-tunnel_queue:
+ skb_queue_tail(&tnlq, skb);
+ tipc_link_xmit(l, &tnlq, &tmpxq);
+ __skb_queue_purge(&tmpxq);
+
+ /* Initialize reusable tunnel packet header */
+ tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL,
+ mtyp, INT_H_SIZE, l->addr);
+ pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq);
+ msg_set_msgcnt(&tnlhdr, pktcnt);
+ msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
+tnl:
+ /* Wrap each packet into a tunnel packet */
skb_queue_walk(queue, skb) {
- struct sk_buff *outskb;
- struct tipc_msg *msg = buf_msg(skb);
- u32 len = msg_size(msg);
-
- msg_set_ack(msg, mod(link->rcv_nxt - 1));
- msg_set_bcast_ack(msg, link->owner->bclink.last_in);
- msg_set_size(&tnl_hdr, len + INT_H_SIZE);
- outskb = tipc_buf_acquire(len + INT_H_SIZE);
- if (outskb == NULL) {
- pr_warn("%sunable to send duplicate msg\n",
- link_co_err);
+ hdr = buf_msg(skb);
+ if (queue == &l->backlogq)
+ msg_set_seqno(hdr, seqno++);
+ pktlen = msg_size(hdr);
+ msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
+ tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE);
+ if (!tnlskb) {
+ pr_warn("%sunable to send packet\n", link_co_err);
return;
}
- skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE);
- skb_copy_to_linear_data_offset(outskb, INT_H_SIZE,
- skb->data, len);
- __tipc_link_xmit_skb(tnl, outskb);
- if (!tipc_link_is_up(link))
- return;
+ skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
+ skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
+ __skb_queue_tail(&tnlq, tnlskb);
}
- if (queue == &link->backlogq)
- return;
- seqno = link->snd_nxt;
- skb_queue_walk(&link->backlogq, skb) {
- msg_set_seqno(buf_msg(skb), seqno);
- seqno = mod(seqno + 1);
- }
- queue = &link->backlogq;
- goto tunnel_queue;
-}
-
-/* tipc_link_failover_rcv(): Receive a tunnelled FAILOVER_MSG packet
- * Owner node is locked.
- */
-static bool tipc_link_failover_rcv(struct tipc_link *link,
- struct sk_buff **skb)
-{
- struct tipc_msg *msg = buf_msg(*skb);
- struct sk_buff *iskb = NULL;
- struct tipc_link *pl = NULL;
- int bearer_id = msg_bearer_id(msg);
- int pos = 0;
-
- if (msg_type(msg) != FAILOVER_MSG) {
- pr_warn("%sunknown tunnel pkt received\n", link_co_err);
- goto exit;
+ if (queue != &l->backlogq) {
+ queue = &l->backlogq;
+ goto tnl;
}
- if (bearer_id >= MAX_BEARERS)
- goto exit;
-
- if (bearer_id == link->bearer_id)
- goto exit;
-
- pl = link->owner->links[bearer_id].link;
- if (pl && tipc_link_is_up(pl))
- tipc_link_reset(pl);
-
- if (link->failover_pkts == FIRST_FAILOVER)
- link->failover_pkts = msg_msgcnt(msg);
-
- /* Should we expect an inner packet? */
- if (!link->failover_pkts)
- goto exit;
- if (!tipc_msg_extract(*skb, &iskb, &pos)) {
- pr_warn("%sno inner failover pkt\n", link_co_err);
- *skb = NULL;
- goto exit;
- }
- link->failover_pkts--;
- *skb = NULL;
+ tipc_link_xmit(tnl, &tnlq, xmitq);
- /* Was this packet already delivered? */
- if (less(buf_seqno(iskb), link->failover_checkpt)) {
- kfree_skb(iskb);
- iskb = NULL;
- goto exit;
+ if (mtyp == FAILOVER_MSG) {
+ tnl->drop_point = l->rcv_nxt;
+ tnl->failover_reasm_skb = l->reasm_buf;
+ l->reasm_buf = NULL;
}
- if (msg_user(buf_msg(iskb)) == MSG_FRAGMENTER) {
- link->stats.recv_fragments++;
- tipc_buf_append(&link->failover_skb, &iskb);
- }
-exit:
- if (!link->failover_pkts && pl)
- pl->exec_mode = TIPC_LINK_OPEN;
- kfree_skb(*skb);
- *skb = iskb;
- return *skb;
}
/* tipc_link_proto_rcv(): receive link level protocol message :
u16 peers_snd_nxt = msg_next_sent(hdr);
u16 peers_tol = msg_link_tolerance(hdr);
u16 peers_prio = msg_linkprio(hdr);
+ u16 rcv_nxt = l->rcv_nxt;
char *if_name;
int rc = 0;
- if (l->exec_mode == TIPC_LINK_BLOCKED)
+ if (tipc_link_is_blocked(l))
goto exit;
if (link_own_addr(l) > msg_prevnode(hdr))
(l->peer_session != WILDCARD_SESSION))
break;
/* fall thru' */
+
case ACTIVATE_MSG:
/* Complete own link name with peer's interface name */
if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
l->priority = peers_prio;
+ if (msg_type(hdr) == RESET_MSG) {
+ rc |= tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
+ } else if (!link_is_up(l)) {
+ tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
+ rc |= tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
+ }
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->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))
+ rc = tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
+ if (!link_is_up(l))
break;
- /* Has peer sent packets we haven't received yet ? */
- if (more(peers_snd_nxt, l->rcv_nxt))
+ /* Send NACK if peer has sent pkts we haven't received yet */
+ if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
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);
+ 0, 0, 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);
+ 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);
u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt;
u16 tail = l->snd_nxt - 1;
- pr_info("%s Link <%s>:", str, l->name);
-
- if (link_probing(l))
- pr_cont(":P\n");
- else if (link_establishing(l))
- pr_cont(":E\n");
- else if (link_resetting(l))
- pr_cont(":R\n");
- else if (link_working(l))
- pr_cont(":W\n");
- else
- pr_cont("\n");
-
+ pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
skb_queue_len(&l->transmq), head, tail,
skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
projects / cascardo / linux.git / blobdiff