/*
* net/tipc/node.c: TIPC node management routines
*
- * Copyright (c) 2000-2006, 2012-2014, Ericsson AB
+ * Copyright (c) 2000-2006, 2012-2015, Ericsson AB
* Copyright (c) 2005-2006, 2010-2014, Wind River Systems
* All rights reserved.
*
#include "node.h"
#include "name_distr.h"
#include "socket.h"
+#include "bcast.h"
+#include "discover.h"
-static void node_lost_contact(struct tipc_node *n_ptr);
-static void node_established_contact(struct tipc_node *n_ptr);
+/* Node FSM states and events:
+ */
+enum {
+ SELF_DOWN_PEER_DOWN = 0xdd,
+ SELF_UP_PEER_UP = 0xaa,
+ SELF_DOWN_PEER_LEAVING = 0xd1,
+ SELF_UP_PEER_COMING = 0xac,
+ SELF_COMING_PEER_UP = 0xca,
+ SELF_LEAVING_PEER_DOWN = 0x1d,
+ NODE_FAILINGOVER = 0xf0,
+ NODE_SYNCHING = 0xcc
+};
+
+enum {
+ SELF_ESTABL_CONTACT_EVT = 0xece,
+ SELF_LOST_CONTACT_EVT = 0x1ce,
+ PEER_ESTABL_CONTACT_EVT = 0x9ece,
+ PEER_LOST_CONTACT_EVT = 0x91ce,
+ NODE_FAILOVER_BEGIN_EVT = 0xfbe,
+ NODE_FAILOVER_END_EVT = 0xfee,
+ NODE_SYNCH_BEGIN_EVT = 0xcbe,
+ NODE_SYNCH_END_EVT = 0xcee
+};
+
+static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
+ struct sk_buff_head *xmitq,
+ struct tipc_media_addr **maddr);
+static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
+ bool delete);
+static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
static void tipc_node_delete(struct tipc_node *node);
+static void tipc_node_timeout(unsigned long data);
+static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
struct tipc_sock_conn {
u32 port;
return NULL;
}
-struct tipc_node *tipc_node_create(struct net *net, u32 addr)
+struct tipc_node *tipc_node_create(struct net *net, u32 addr, u16 capabilities)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_node *n_ptr, *temp_node;
}
n_ptr->addr = addr;
n_ptr->net = net;
+ n_ptr->capabilities = capabilities;
kref_init(&n_ptr->kref);
spin_lock_init(&n_ptr->lock);
INIT_HLIST_NODE(&n_ptr->hash);
INIT_LIST_HEAD(&n_ptr->list);
INIT_LIST_HEAD(&n_ptr->publ_list);
INIT_LIST_HEAD(&n_ptr->conn_sks);
- __skb_queue_head_init(&n_ptr->bclink.deferdq);
+ skb_queue_head_init(&n_ptr->bc_entry.namedq);
+ skb_queue_head_init(&n_ptr->bc_entry.inputq1);
+ __skb_queue_head_init(&n_ptr->bc_entry.arrvq);
+ skb_queue_head_init(&n_ptr->bc_entry.inputq2);
+ n_ptr->state = SELF_DOWN_PEER_LEAVING;
+ n_ptr->signature = INVALID_NODE_SIG;
+ n_ptr->active_links[0] = INVALID_BEARER_ID;
+ n_ptr->active_links[1] = INVALID_BEARER_ID;
+ if (!tipc_link_bc_create(net, tipc_own_addr(net), n_ptr->addr,
+ U16_MAX, tipc_bc_sndlink(net)->window,
+ n_ptr->capabilities,
+ &n_ptr->bc_entry.inputq1,
+ &n_ptr->bc_entry.namedq,
+ tipc_bc_sndlink(net),
+ &n_ptr->bc_entry.link)) {
+ pr_warn("Broadcast rcv link creation failed, no memory\n");
+ kfree(n_ptr);
+ n_ptr = NULL;
+ goto exit;
+ }
+ tipc_node_get(n_ptr);
+ setup_timer(&n_ptr->timer, tipc_node_timeout, (unsigned long)n_ptr);
+ n_ptr->keepalive_intv = U32_MAX;
hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]);
list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
if (n_ptr->addr < temp_node->addr)
break;
}
list_add_tail_rcu(&n_ptr->list, &temp_node->list);
- n_ptr->action_flags = TIPC_WAIT_PEER_LINKS_DOWN;
- n_ptr->signature = INVALID_NODE_SIG;
- tipc_node_get(n_ptr);
exit:
spin_unlock_bh(&tn->node_list_lock);
return n_ptr;
}
+static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
+{
+ unsigned long tol = l->tolerance;
+ unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
+ unsigned long keepalive_intv = msecs_to_jiffies(intv);
+
+ /* Link with lowest tolerance determines timer interval */
+ if (keepalive_intv < n->keepalive_intv)
+ n->keepalive_intv = keepalive_intv;
+
+ /* Ensure link's abort limit corresponds to current interval */
+ l->abort_limit = l->tolerance / jiffies_to_msecs(n->keepalive_intv);
+}
+
static void tipc_node_delete(struct tipc_node *node)
{
list_del_rcu(&node->list);
hlist_del_rcu(&node->hash);
+ kfree(node->bc_entry.link);
kfree_rcu(node, rcu);
}
struct tipc_node *node, *t_node;
spin_lock_bh(&tn->node_list_lock);
- list_for_each_entry_safe(node, t_node, &tn->node_list, list)
+ list_for_each_entry_safe(node, t_node, &tn->node_list, list) {
+ if (del_timer(&node->timer))
+ tipc_node_put(node);
tipc_node_put(node);
+ }
spin_unlock_bh(&tn->node_list_lock);
}
tipc_node_put(node);
}
+/* tipc_node_timeout - handle expiration of node timer
+ */
+static void tipc_node_timeout(unsigned long data)
+{
+ struct tipc_node *n = (struct tipc_node *)data;
+ struct tipc_link_entry *le;
+ struct sk_buff_head xmitq;
+ int bearer_id;
+ int rc = 0;
+
+ __skb_queue_head_init(&xmitq);
+
+ for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
+ tipc_node_lock(n);
+ le = &n->links[bearer_id];
+ if (le->link) {
+ /* Link tolerance may change asynchronously: */
+ tipc_node_calculate_timer(n, le->link);
+ rc = tipc_link_timeout(le->link, &xmitq);
+ }
+ tipc_node_unlock(n);
+ tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
+ if (rc & TIPC_LINK_DOWN_EVT)
+ tipc_node_link_down(n, bearer_id, false);
+ }
+ if (!mod_timer(&n->timer, jiffies + n->keepalive_intv))
+ tipc_node_get(n);
+ tipc_node_put(n);
+}
+
/**
- * tipc_node_link_up - handle addition of link
- *
+ * __tipc_node_link_up - handle addition of link
+ * Node lock must be held by caller
* Link becomes active (alone or shared) or standby, depending on its priority.
*/
-void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
+static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
+ struct sk_buff_head *xmitq)
{
- struct tipc_link **active = &n_ptr->active_links[0];
+ int *slot0 = &n->active_links[0];
+ int *slot1 = &n->active_links[1];
+ struct tipc_link *ol = node_active_link(n, 0);
+ struct tipc_link *nl = n->links[bearer_id].link;
- n_ptr->working_links++;
- n_ptr->action_flags |= TIPC_NOTIFY_LINK_UP;
- n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id;
+ if (!nl)
+ return;
- pr_debug("Established link <%s> on network plane %c\n",
- l_ptr->name, l_ptr->net_plane);
+ tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
+ if (!tipc_link_is_up(nl))
+ return;
- if (!active[0]) {
- active[0] = active[1] = l_ptr;
- node_established_contact(n_ptr);
- goto exit;
- }
- if (l_ptr->priority < active[0]->priority) {
- pr_debug("New link <%s> becomes standby\n", l_ptr->name);
- goto exit;
+ n->working_links++;
+ n->action_flags |= TIPC_NOTIFY_LINK_UP;
+ n->link_id = nl->peer_bearer_id << 16 | bearer_id;
+
+ /* Leave room for tunnel header when returning 'mtu' to users: */
+ n->links[bearer_id].mtu = nl->mtu - INT_H_SIZE;
+
+ tipc_bearer_add_dest(n->net, bearer_id, n->addr);
+ tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
+
+ pr_debug("Established link <%s> on network plane %c\n",
+ nl->name, nl->net_plane);
+
+ /* First link? => give it both slots */
+ if (!ol) {
+ *slot0 = bearer_id;
+ *slot1 = bearer_id;
+ tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
+ n->action_flags |= TIPC_NOTIFY_NODE_UP;
+ tipc_bcast_add_peer(n->net, nl, xmitq);
+ return;
}
- tipc_link_dup_queue_xmit(active[0], l_ptr);
- if (l_ptr->priority == active[0]->priority) {
- active[0] = l_ptr;
- goto exit;
+
+ /* Second link => redistribute slots */
+ if (nl->priority > ol->priority) {
+ pr_debug("Old link <%s> becomes standby\n", ol->name);
+ *slot0 = bearer_id;
+ *slot1 = bearer_id;
+ tipc_link_set_active(nl, true);
+ tipc_link_set_active(ol, false);
+ } else if (nl->priority == ol->priority) {
+ tipc_link_set_active(nl, true);
+ *slot1 = bearer_id;
+ } else {
+ pr_debug("New link <%s> is standby\n", nl->name);
}
- pr_debug("Old link <%s> becomes standby\n", active[0]->name);
- if (active[1] != active[0])
- pr_debug("Old link <%s> becomes standby\n", active[1]->name);
- active[0] = active[1] = l_ptr;
-exit:
- /* Leave room for changeover header when returning 'mtu' to users: */
- n_ptr->act_mtus[0] = active[0]->mtu - INT_H_SIZE;
- n_ptr->act_mtus[1] = active[1]->mtu - INT_H_SIZE;
+
+ /* Prepare synchronization with first link */
+ tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
}
/**
- * node_select_active_links - select active link
+ * tipc_node_link_up - handle addition of link
+ *
+ * Link becomes active (alone or shared) or standby, depending on its priority.
*/
-static void node_select_active_links(struct tipc_node *n_ptr)
+static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
+ struct sk_buff_head *xmitq)
{
- struct tipc_link **active = &n_ptr->active_links[0];
- u32 i;
- u32 highest_prio = 0;
+ tipc_node_lock(n);
+ __tipc_node_link_up(n, bearer_id, xmitq);
+ tipc_node_unlock(n);
+}
- active[0] = active[1] = NULL;
+/**
+ * __tipc_node_link_down - handle loss of link
+ */
+static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
+ struct sk_buff_head *xmitq,
+ struct tipc_media_addr **maddr)
+{
+ struct tipc_link_entry *le = &n->links[*bearer_id];
+ int *slot0 = &n->active_links[0];
+ int *slot1 = &n->active_links[1];
+ int i, highest = 0;
+ struct tipc_link *l, *_l, *tnl;
+
+ l = n->links[*bearer_id].link;
+ if (!l || tipc_link_is_reset(l))
+ return;
- for (i = 0; i < MAX_BEARERS; i++) {
- struct tipc_link *l_ptr = n_ptr->links[i];
+ n->working_links--;
+ n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
+ n->link_id = l->peer_bearer_id << 16 | *bearer_id;
- if (!l_ptr || !tipc_link_is_up(l_ptr) ||
- (l_ptr->priority < highest_prio))
- continue;
+ tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
- if (l_ptr->priority > highest_prio) {
- highest_prio = l_ptr->priority;
- active[0] = active[1] = l_ptr;
- } else {
- active[1] = l_ptr;
+ pr_debug("Lost link <%s> on network plane %c\n",
+ l->name, l->net_plane);
+
+ /* Select new active link if any available */
+ *slot0 = INVALID_BEARER_ID;
+ *slot1 = INVALID_BEARER_ID;
+ for (i = 0; i < MAX_BEARERS; i++) {
+ _l = n->links[i].link;
+ if (!_l || !tipc_link_is_up(_l))
+ continue;
+ if (_l == l)
+ continue;
+ if (_l->priority < highest)
+ continue;
+ if (_l->priority > highest) {
+ highest = _l->priority;
+ *slot0 = i;
+ *slot1 = i;
+ continue;
}
+ *slot1 = i;
}
+
+ if (!tipc_node_is_up(n)) {
+ if (tipc_link_peer_is_down(l))
+ tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
+ tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
+ tipc_link_fsm_evt(l, LINK_RESET_EVT);
+ tipc_link_reset(l);
+ tipc_link_build_reset_msg(l, xmitq);
+ *maddr = &n->links[*bearer_id].maddr;
+ node_lost_contact(n, &le->inputq);
+ tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
+ return;
+ }
+ tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
+
+ /* There is still a working link => initiate failover */
+ tnl = node_active_link(n, 0);
+ tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
+ tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
+ n->sync_point = tnl->rcv_nxt + (U16_MAX / 2 - 1);
+ tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
+ tipc_link_reset(l);
+ tipc_link_fsm_evt(l, LINK_RESET_EVT);
+ tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
+ tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
+ *maddr = &n->links[tnl->bearer_id].maddr;
+ *bearer_id = tnl->bearer_id;
}
-/**
- * tipc_node_link_down - handle loss of link
- */
-void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
+static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
{
- struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
- struct tipc_link **active;
-
- n_ptr->working_links--;
- n_ptr->action_flags |= TIPC_NOTIFY_LINK_DOWN;
- n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id;
+ struct tipc_link_entry *le = &n->links[bearer_id];
+ struct tipc_link *l = le->link;
+ struct tipc_media_addr *maddr;
+ struct sk_buff_head xmitq;
- if (!tipc_link_is_active(l_ptr)) {
- pr_debug("Lost standby link <%s> on network plane %c\n",
- l_ptr->name, l_ptr->net_plane);
+ if (!l)
return;
- }
- pr_debug("Lost link <%s> on network plane %c\n",
- l_ptr->name, l_ptr->net_plane);
-
- active = &n_ptr->active_links[0];
- if (active[0] == l_ptr)
- active[0] = active[1];
- if (active[1] == l_ptr)
- active[1] = active[0];
- if (active[0] == l_ptr)
- node_select_active_links(n_ptr);
- if (tipc_node_is_up(n_ptr))
- tipc_link_failover_send_queue(l_ptr);
- else
- node_lost_contact(n_ptr);
- /* Leave room for changeover header when returning 'mtu' to users: */
- if (active[0]) {
- n_ptr->act_mtus[0] = active[0]->mtu - INT_H_SIZE;
- n_ptr->act_mtus[1] = active[1]->mtu - INT_H_SIZE;
- return;
- }
- /* Loopback link went down? No fragmentation needed from now on. */
- if (n_ptr->addr == tn->own_addr) {
- n_ptr->act_mtus[0] = MAX_MSG_SIZE;
- n_ptr->act_mtus[1] = MAX_MSG_SIZE;
+ __skb_queue_head_init(&xmitq);
+
+ tipc_node_lock(n);
+ if (!tipc_link_is_establishing(l)) {
+ __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
+ if (delete) {
+ kfree(l);
+ le->link = NULL;
+ n->link_cnt--;
+ }
+ } else {
+ /* Defuse pending tipc_node_link_up() */
+ tipc_link_fsm_evt(l, LINK_RESET_EVT);
}
+ tipc_node_unlock(n);
+ tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
+ tipc_sk_rcv(n->net, &le->inputq);
}
-int tipc_node_active_links(struct tipc_node *n_ptr)
+bool tipc_node_is_up(struct tipc_node *n)
{
- return n_ptr->active_links[0] != NULL;
+ return n->active_links[0] != INVALID_BEARER_ID;
}
-int tipc_node_is_up(struct tipc_node *n_ptr)
+void tipc_node_check_dest(struct net *net, u32 onode,
+ struct tipc_bearer *b,
+ u16 capabilities, u32 signature,
+ struct tipc_media_addr *maddr,
+ bool *respond, bool *dupl_addr)
{
- return tipc_node_active_links(n_ptr);
+ struct tipc_node *n;
+ struct tipc_link *l;
+ struct tipc_link_entry *le;
+ bool addr_match = false;
+ bool sign_match = false;
+ bool link_up = false;
+ bool accept_addr = false;
+ bool reset = true;
+ char *if_name;
+
+ *dupl_addr = false;
+ *respond = false;
+
+ n = tipc_node_create(net, onode, capabilities);
+ if (!n)
+ return;
+
+ tipc_node_lock(n);
+
+ le = &n->links[b->identity];
+
+ /* Prepare to validate requesting node's signature and media address */
+ l = le->link;
+ link_up = l && tipc_link_is_up(l);
+ addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
+ sign_match = (signature == n->signature);
+
+ /* These three flags give us eight permutations: */
+
+ if (sign_match && addr_match && link_up) {
+ /* All is fine. Do nothing. */
+ reset = false;
+ } else if (sign_match && addr_match && !link_up) {
+ /* Respond. The link will come up in due time */
+ *respond = true;
+ } else if (sign_match && !addr_match && link_up) {
+ /* Peer has changed i/f address without rebooting.
+ * If so, the link will reset soon, and the next
+ * discovery will be accepted. So we can ignore it.
+ * It may also be an cloned or malicious peer having
+ * chosen the same node address and signature as an
+ * existing one.
+ * Ignore requests until the link goes down, if ever.
+ */
+ *dupl_addr = true;
+ } else if (sign_match && !addr_match && !link_up) {
+ /* Peer link has changed i/f address without rebooting.
+ * It may also be a cloned or malicious peer; we can't
+ * distinguish between the two.
+ * The signature is correct, so we must accept.
+ */
+ accept_addr = true;
+ *respond = true;
+ } else if (!sign_match && addr_match && link_up) {
+ /* Peer node rebooted. Two possibilities:
+ * - Delayed re-discovery; this link endpoint has already
+ * reset and re-established contact with the peer, before
+ * receiving a discovery message from that node.
+ * (The peer happened to receive one from this node first).
+ * - The peer came back so fast that our side has not
+ * discovered it yet. Probing from this side will soon
+ * reset the link, since there can be no working link
+ * endpoint at the peer end, and the link will re-establish.
+ * Accept the signature, since it comes from a known peer.
+ */
+ n->signature = signature;
+ } else if (!sign_match && addr_match && !link_up) {
+ /* The peer node has rebooted.
+ * Accept signature, since it is a known peer.
+ */
+ n->signature = signature;
+ *respond = true;
+ } else if (!sign_match && !addr_match && link_up) {
+ /* Peer rebooted with new address, or a new/duplicate peer.
+ * Ignore until the link goes down, if ever.
+ */
+ *dupl_addr = true;
+ } else if (!sign_match && !addr_match && !link_up) {
+ /* Peer rebooted with new address, or it is a new peer.
+ * Accept signature and address.
+ */
+ n->signature = signature;
+ accept_addr = true;
+ *respond = true;
+ }
+
+ if (!accept_addr)
+ goto exit;
+
+ /* Now create new link if not already existing */
+ if (!l) {
+ if (n->link_cnt == 2) {
+ pr_warn("Cannot establish 3rd link to %x\n", n->addr);
+ goto exit;
+ }
+ if_name = strchr(b->name, ':') + 1;
+ if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
+ b->net_plane, b->mtu, b->priority,
+ b->window, mod(tipc_net(net)->random),
+ tipc_own_addr(net), onode,
+ n->capabilities,
+ tipc_bc_sndlink(n->net), n->bc_entry.link,
+ &le->inputq,
+ &n->bc_entry.namedq, &l)) {
+ *respond = false;
+ goto exit;
+ }
+ tipc_link_reset(l);
+ tipc_link_fsm_evt(l, LINK_RESET_EVT);
+ if (n->state == NODE_FAILINGOVER)
+ tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
+ le->link = l;
+ n->link_cnt++;
+ tipc_node_calculate_timer(n, l);
+ if (n->link_cnt == 1)
+ if (!mod_timer(&n->timer, jiffies + n->keepalive_intv))
+ tipc_node_get(n);
+ }
+ memcpy(&le->maddr, maddr, sizeof(*maddr));
+exit:
+ tipc_node_unlock(n);
+ if (reset && !tipc_link_is_reset(l))
+ tipc_node_link_down(n, b->identity, false);
+ tipc_node_put(n);
}
-void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
+void tipc_node_delete_links(struct net *net, int bearer_id)
{
- n_ptr->links[l_ptr->bearer_id] = l_ptr;
- n_ptr->link_cnt++;
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+ struct tipc_node *n;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(n, &tn->node_list, list) {
+ tipc_node_link_down(n, bearer_id, true);
+ }
+ rcu_read_unlock();
}
-void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
+static void tipc_node_reset_links(struct tipc_node *n)
{
+ char addr_string[16];
int i;
+ pr_warn("Resetting all links to %s\n",
+ tipc_addr_string_fill(addr_string, n->addr));
+
for (i = 0; i < MAX_BEARERS; i++) {
- if (l_ptr != n_ptr->links[i])
- continue;
- n_ptr->links[i] = NULL;
- n_ptr->link_cnt--;
+ tipc_node_link_down(n, i, false);
+ }
+}
+
+/* tipc_node_fsm_evt - node finite state machine
+ * Determines when contact is allowed with peer node
+ */
+static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
+{
+ int state = n->state;
+
+ switch (state) {
+ case SELF_DOWN_PEER_DOWN:
+ switch (evt) {
+ case SELF_ESTABL_CONTACT_EVT:
+ state = SELF_UP_PEER_COMING;
+ break;
+ case PEER_ESTABL_CONTACT_EVT:
+ state = SELF_COMING_PEER_UP;
+ break;
+ case SELF_LOST_CONTACT_EVT:
+ case PEER_LOST_CONTACT_EVT:
+ break;
+ case NODE_SYNCH_END_EVT:
+ case NODE_SYNCH_BEGIN_EVT:
+ case NODE_FAILOVER_BEGIN_EVT:
+ case NODE_FAILOVER_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case SELF_UP_PEER_UP:
+ switch (evt) {
+ case SELF_LOST_CONTACT_EVT:
+ state = SELF_DOWN_PEER_LEAVING;
+ break;
+ case PEER_LOST_CONTACT_EVT:
+ state = SELF_LEAVING_PEER_DOWN;
+ break;
+ case NODE_SYNCH_BEGIN_EVT:
+ state = NODE_SYNCHING;
+ break;
+ case NODE_FAILOVER_BEGIN_EVT:
+ state = NODE_FAILINGOVER;
+ break;
+ case SELF_ESTABL_CONTACT_EVT:
+ case PEER_ESTABL_CONTACT_EVT:
+ case NODE_SYNCH_END_EVT:
+ case NODE_FAILOVER_END_EVT:
+ break;
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case SELF_DOWN_PEER_LEAVING:
+ switch (evt) {
+ case PEER_LOST_CONTACT_EVT:
+ state = SELF_DOWN_PEER_DOWN;
+ break;
+ case SELF_ESTABL_CONTACT_EVT:
+ case PEER_ESTABL_CONTACT_EVT:
+ case SELF_LOST_CONTACT_EVT:
+ break;
+ case NODE_SYNCH_END_EVT:
+ case NODE_SYNCH_BEGIN_EVT:
+ case NODE_FAILOVER_BEGIN_EVT:
+ case NODE_FAILOVER_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case SELF_UP_PEER_COMING:
+ switch (evt) {
+ case PEER_ESTABL_CONTACT_EVT:
+ state = SELF_UP_PEER_UP;
+ break;
+ case SELF_LOST_CONTACT_EVT:
+ state = SELF_DOWN_PEER_LEAVING;
+ break;
+ case SELF_ESTABL_CONTACT_EVT:
+ case PEER_LOST_CONTACT_EVT:
+ case NODE_SYNCH_END_EVT:
+ case NODE_FAILOVER_BEGIN_EVT:
+ break;
+ case NODE_SYNCH_BEGIN_EVT:
+ case NODE_FAILOVER_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case SELF_COMING_PEER_UP:
+ switch (evt) {
+ case SELF_ESTABL_CONTACT_EVT:
+ state = SELF_UP_PEER_UP;
+ break;
+ case PEER_LOST_CONTACT_EVT:
+ state = SELF_LEAVING_PEER_DOWN;
+ break;
+ case SELF_LOST_CONTACT_EVT:
+ case PEER_ESTABL_CONTACT_EVT:
+ break;
+ case NODE_SYNCH_END_EVT:
+ case NODE_SYNCH_BEGIN_EVT:
+ case NODE_FAILOVER_BEGIN_EVT:
+ case NODE_FAILOVER_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case SELF_LEAVING_PEER_DOWN:
+ switch (evt) {
+ case SELF_LOST_CONTACT_EVT:
+ state = SELF_DOWN_PEER_DOWN;
+ break;
+ case SELF_ESTABL_CONTACT_EVT:
+ case PEER_ESTABL_CONTACT_EVT:
+ case PEER_LOST_CONTACT_EVT:
+ break;
+ case NODE_SYNCH_END_EVT:
+ case NODE_SYNCH_BEGIN_EVT:
+ case NODE_FAILOVER_BEGIN_EVT:
+ case NODE_FAILOVER_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case NODE_FAILINGOVER:
+ switch (evt) {
+ case SELF_LOST_CONTACT_EVT:
+ state = SELF_DOWN_PEER_LEAVING;
+ break;
+ case PEER_LOST_CONTACT_EVT:
+ state = SELF_LEAVING_PEER_DOWN;
+ break;
+ case NODE_FAILOVER_END_EVT:
+ state = SELF_UP_PEER_UP;
+ break;
+ case NODE_FAILOVER_BEGIN_EVT:
+ case SELF_ESTABL_CONTACT_EVT:
+ case PEER_ESTABL_CONTACT_EVT:
+ break;
+ case NODE_SYNCH_BEGIN_EVT:
+ case NODE_SYNCH_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ case NODE_SYNCHING:
+ switch (evt) {
+ case SELF_LOST_CONTACT_EVT:
+ state = SELF_DOWN_PEER_LEAVING;
+ break;
+ case PEER_LOST_CONTACT_EVT:
+ state = SELF_LEAVING_PEER_DOWN;
+ break;
+ case NODE_SYNCH_END_EVT:
+ state = SELF_UP_PEER_UP;
+ break;
+ case NODE_FAILOVER_BEGIN_EVT:
+ state = NODE_FAILINGOVER;
+ break;
+ case NODE_SYNCH_BEGIN_EVT:
+ case SELF_ESTABL_CONTACT_EVT:
+ case PEER_ESTABL_CONTACT_EVT:
+ break;
+ case NODE_FAILOVER_END_EVT:
+ default:
+ goto illegal_evt;
+ }
+ break;
+ default:
+ pr_err("Unknown node fsm state %x\n", state);
+ break;
}
+ n->state = state;
+ return;
+
+illegal_evt:
+ pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
}
-static void node_established_contact(struct tipc_node *n_ptr)
+bool tipc_node_filter_pkt(struct tipc_node *n, struct tipc_msg *hdr)
{
- n_ptr->action_flags |= TIPC_NOTIFY_NODE_UP;
- n_ptr->bclink.oos_state = 0;
- n_ptr->bclink.acked = tipc_bclink_get_last_sent(n_ptr->net);
- tipc_bclink_add_node(n_ptr->net, n_ptr->addr);
+ int state = n->state;
+
+ if (likely(state == SELF_UP_PEER_UP))
+ return true;
+
+ if (state == SELF_LEAVING_PEER_DOWN)
+ return false;
+
+ if (state == SELF_DOWN_PEER_LEAVING) {
+ if (msg_peer_node_is_up(hdr))
+ return false;
+ }
+
+ return true;
}
-static void node_lost_contact(struct tipc_node *n_ptr)
+static void node_lost_contact(struct tipc_node *n,
+ struct sk_buff_head *inputq)
{
char addr_string[16];
struct tipc_sock_conn *conn, *safe;
- struct list_head *conns = &n_ptr->conn_sks;
+ struct tipc_link *l;
+ struct list_head *conns = &n->conn_sks;
struct sk_buff *skb;
- struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
uint i;
pr_debug("Lost contact with %s\n",
- tipc_addr_string_fill(addr_string, n_ptr->addr));
-
- /* Flush broadcast link info associated with lost node */
- if (n_ptr->bclink.recv_permitted) {
- __skb_queue_purge(&n_ptr->bclink.deferdq);
-
- if (n_ptr->bclink.reasm_buf) {
- kfree_skb(n_ptr->bclink.reasm_buf);
- n_ptr->bclink.reasm_buf = NULL;
- }
-
- tipc_bclink_remove_node(n_ptr->net, n_ptr->addr);
- tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ);
+ tipc_addr_string_fill(addr_string, n->addr));
- n_ptr->bclink.recv_permitted = false;
- }
+ /* Clean up broadcast state */
+ tipc_bcast_remove_peer(n->net, n->bc_entry.link);
/* Abort any ongoing link failover */
for (i = 0; i < MAX_BEARERS; i++) {
- struct tipc_link *l_ptr = n_ptr->links[i];
- if (!l_ptr)
- continue;
- l_ptr->flags &= ~LINK_FAILINGOVER;
- l_ptr->failover_checkpt = 0;
- l_ptr->failover_pkts = 0;
- kfree_skb(l_ptr->failover_skb);
- l_ptr->failover_skb = NULL;
- tipc_link_reset_fragments(l_ptr);
+ l = n->links[i].link;
+ if (l)
+ tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
}
- n_ptr->action_flags &= ~TIPC_WAIT_OWN_LINKS_DOWN;
-
- /* Prevent re-contact with node until cleanup is done */
- n_ptr->action_flags |= TIPC_WAIT_PEER_LINKS_DOWN;
-
/* Notify publications from this node */
- n_ptr->action_flags |= TIPC_NOTIFY_NODE_DOWN;
+ n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
/* Notify sockets connected to node */
list_for_each_entry_safe(conn, safe, conns, list) {
skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
- SHORT_H_SIZE, 0, tn->own_addr,
+ SHORT_H_SIZE, 0, tipc_own_addr(n->net),
conn->peer_node, conn->port,
conn->peer_port, TIPC_ERR_NO_NODE);
- if (likely(skb)) {
- skb_queue_tail(n_ptr->inputq, skb);
- n_ptr->action_flags |= TIPC_MSG_EVT;
- }
+ if (likely(skb))
+ skb_queue_tail(inputq, skb);
list_del(&conn->list);
kfree(conn);
}
goto exit;
tipc_node_lock(node);
- link = node->links[bearer_id];
+ link = node->links[bearer_id].link;
if (link) {
strncpy(linkname, link->name, len);
err = 0;
u32 flags = node->action_flags;
u32 link_id = 0;
struct list_head *publ_list;
- struct sk_buff_head *inputq = node->inputq;
- struct sk_buff_head *namedq;
- if (likely(!flags || (flags == TIPC_MSG_EVT))) {
- node->action_flags = 0;
+ if (likely(!flags)) {
spin_unlock_bh(&node->lock);
- if (flags == TIPC_MSG_EVT)
- tipc_sk_rcv(net, inputq);
return;
}
addr = node->addr;
link_id = node->link_id;
- namedq = node->namedq;
publ_list = &node->publ_list;
- node->action_flags &= ~(TIPC_MSG_EVT |
- TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
- TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP |
- TIPC_WAKEUP_BCAST_USERS | TIPC_BCAST_MSG_EVT |
- TIPC_NAMED_MSG_EVT | TIPC_BCAST_RESET);
+ node->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
+ TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
spin_unlock_bh(&node->lock);
if (flags & TIPC_NOTIFY_NODE_DOWN)
tipc_publ_notify(net, publ_list, addr);
- if (flags & TIPC_WAKEUP_BCAST_USERS)
- tipc_bclink_wakeup_users(net);
-
if (flags & TIPC_NOTIFY_NODE_UP)
tipc_named_node_up(net, addr);
tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
link_id, addr);
- if (flags & TIPC_MSG_EVT)
- tipc_sk_rcv(net, inputq);
-
- if (flags & TIPC_NAMED_MSG_EVT)
- tipc_named_rcv(net, namedq);
-
- if (flags & TIPC_BCAST_MSG_EVT)
- tipc_bclink_input(net);
-
- if (flags & TIPC_BCAST_RESET)
- tipc_link_reset_all(node);
}
/* Caller should hold node lock for the passed node */
return -EMSGSIZE;
}
+static struct tipc_link *tipc_node_select_link(struct tipc_node *n, int sel,
+ int *bearer_id,
+ struct tipc_media_addr **maddr)
+{
+ int id = n->active_links[sel & 1];
+
+ if (unlikely(id < 0))
+ return NULL;
+
+ *bearer_id = id;
+ *maddr = &n->links[id].maddr;
+ return n->links[id].link;
+}
+
+/**
+ * tipc_node_xmit() is the general link level function for message sending
+ * @net: the applicable net namespace
+ * @list: chain of buffers containing message
+ * @dnode: address of destination node
+ * @selector: a number used for deterministic link selection
+ * Consumes the buffer chain, except when returning -ELINKCONG
+ * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
+ */
+int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
+ u32 dnode, int selector)
+{
+ struct tipc_link *l = NULL;
+ struct tipc_node *n;
+ struct sk_buff_head xmitq;
+ struct tipc_media_addr *maddr;
+ int bearer_id;
+ int rc = -EHOSTUNREACH;
+
+ __skb_queue_head_init(&xmitq);
+ n = tipc_node_find(net, dnode);
+ if (likely(n)) {
+ tipc_node_lock(n);
+ l = tipc_node_select_link(n, selector, &bearer_id, &maddr);
+ if (likely(l))
+ rc = tipc_link_xmit(l, list, &xmitq);
+ tipc_node_unlock(n);
+ if (unlikely(rc == -ENOBUFS))
+ tipc_node_link_down(n, bearer_id, false);
+ tipc_node_put(n);
+ }
+ if (likely(!rc)) {
+ tipc_bearer_xmit(net, bearer_id, &xmitq, maddr);
+ return 0;
+ }
+ if (likely(in_own_node(net, dnode))) {
+ tipc_sk_rcv(net, list);
+ return 0;
+ }
+ return rc;
+}
+
+/* tipc_node_xmit_skb(): send single buffer to destination
+ * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
+ * messages, which will not be rejected
+ * The only exception is datagram messages rerouted after secondary
+ * lookup, which are rare and safe to dispose of anyway.
+ * TODO: Return real return value, and let callers use
+ * tipc_wait_for_sendpkt() where applicable
+ */
+int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
+ u32 selector)
+{
+ struct sk_buff_head head;
+ int rc;
+
+ skb_queue_head_init(&head);
+ __skb_queue_tail(&head, skb);
+ rc = tipc_node_xmit(net, &head, dnode, selector);
+ if (rc == -ELINKCONG)
+ kfree_skb(skb);
+ return 0;
+}
+
+/**
+ * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
+ * @net: the applicable net namespace
+ * @skb: TIPC packet
+ * @bearer_id: id of bearer message arrived on
+ *
+ * Invoked with no locks held.
+ */
+static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
+{
+ int rc;
+ struct sk_buff_head xmitq;
+ struct tipc_bclink_entry *be;
+ struct tipc_link_entry *le;
+ struct tipc_msg *hdr = buf_msg(skb);
+ int usr = msg_user(hdr);
+ u32 dnode = msg_destnode(hdr);
+ struct tipc_node *n;
+
+ __skb_queue_head_init(&xmitq);
+
+ /* If NACK for other node, let rcv link for that node peek into it */
+ if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
+ n = tipc_node_find(net, dnode);
+ else
+ n = tipc_node_find(net, msg_prevnode(hdr));
+ if (!n) {
+ kfree_skb(skb);
+ return;
+ }
+ be = &n->bc_entry;
+ le = &n->links[bearer_id];
+
+ rc = tipc_bcast_rcv(net, be->link, skb);
+
+ /* Broadcast link reset may happen at reassembly failure */
+ if (rc & TIPC_LINK_DOWN_EVT)
+ tipc_node_reset_links(n);
+
+ /* Broadcast ACKs are sent on a unicast link */
+ if (rc & TIPC_LINK_SND_BC_ACK) {
+ tipc_node_lock(n);
+ tipc_link_build_ack_msg(le->link, &xmitq);
+ tipc_node_unlock(n);
+ }
+
+ if (!skb_queue_empty(&xmitq))
+ tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
+
+ /* Deliver. 'arrvq' is under inputq2's lock protection */
+ if (!skb_queue_empty(&be->inputq1)) {
+ spin_lock_bh(&be->inputq2.lock);
+ spin_lock_bh(&be->inputq1.lock);
+ skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
+ spin_unlock_bh(&be->inputq1.lock);
+ spin_unlock_bh(&be->inputq2.lock);
+ tipc_sk_mcast_rcv(net, &be->arrvq, &be->inputq2);
+ }
+ tipc_node_put(n);
+}
+
+/**
+ * tipc_node_check_state - check and if necessary update node state
+ * @skb: TIPC packet
+ * @bearer_id: identity of bearer delivering the packet
+ * Returns true if state is ok, otherwise consumes buffer and returns false
+ */
+static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
+ int bearer_id, struct sk_buff_head *xmitq)
+{
+ struct tipc_msg *hdr = buf_msg(skb);
+ int usr = msg_user(hdr);
+ int mtyp = msg_type(hdr);
+ u16 oseqno = msg_seqno(hdr);
+ u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
+ u16 exp_pkts = msg_msgcnt(hdr);
+ u16 rcv_nxt, syncpt, dlv_nxt;
+ int state = n->state;
+ struct tipc_link *l, *tnl, *pl = NULL;
+ struct tipc_media_addr *maddr;
+ int i, pb_id;
+
+ l = n->links[bearer_id].link;
+ if (!l)
+ return false;
+ rcv_nxt = l->rcv_nxt;
+
+
+ if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
+ return true;
+
+ /* Find parallel link, if any */
+ for (i = 0; i < MAX_BEARERS; i++) {
+ if ((i != bearer_id) && n->links[i].link) {
+ pl = n->links[i].link;
+ break;
+ }
+ }
+
+ /* Update node accesibility if applicable */
+ if (state == SELF_UP_PEER_COMING) {
+ if (!tipc_link_is_up(l))
+ return true;
+ if (!msg_peer_link_is_up(hdr))
+ return true;
+ tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
+ }
+
+ if (state == SELF_DOWN_PEER_LEAVING) {
+ if (msg_peer_node_is_up(hdr))
+ return false;
+ tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
+ }
+
+ /* Ignore duplicate packets */
+ if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
+ return true;
+
+ /* Initiate or update failover mode if applicable */
+ if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
+ syncpt = oseqno + exp_pkts - 1;
+ if (pl && tipc_link_is_up(pl)) {
+ pb_id = pl->bearer_id;
+ __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
+ tipc_skb_queue_splice_tail_init(pl->inputq, l->inputq);
+ }
+ /* If pkts arrive out of order, use lowest calculated syncpt */
+ if (less(syncpt, n->sync_point))
+ n->sync_point = syncpt;
+ }
+
+ /* Open parallel link when tunnel link reaches synch point */
+ if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
+ if (!more(rcv_nxt, n->sync_point))
+ return true;
+ tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
+ if (pl)
+ tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
+ return true;
+ }
+
+ /* No synching needed if only one link */
+ if (!pl || !tipc_link_is_up(pl))
+ return true;
+
+ /* Initiate synch mode if applicable */
+ if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
+ syncpt = iseqno + exp_pkts - 1;
+ if (!tipc_link_is_up(l)) {
+ tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
+ __tipc_node_link_up(n, bearer_id, xmitq);
+ }
+ if (n->state == SELF_UP_PEER_UP) {
+ n->sync_point = syncpt;
+ tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
+ tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
+ }
+ if (less(syncpt, n->sync_point))
+ n->sync_point = syncpt;
+ }
+
+ /* Open tunnel link when parallel link reaches synch point */
+ if ((n->state == NODE_SYNCHING) && tipc_link_is_synching(l)) {
+ if (tipc_link_is_synching(l)) {
+ tnl = l;
+ } else {
+ tnl = pl;
+ pl = l;
+ }
+ dlv_nxt = pl->rcv_nxt - mod(skb_queue_len(pl->inputq));
+ if (more(dlv_nxt, n->sync_point)) {
+ tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
+ tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
+ return true;
+ }
+ if (l == pl)
+ return true;
+ if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
+ return true;
+ if (usr == LINK_PROTOCOL)
+ return true;
+ return false;
+ }
+ return true;
+}
+
+/**
+ * tipc_rcv - process TIPC packets/messages arriving from off-node
+ * @net: the applicable net namespace
+ * @skb: TIPC packet
+ * @bearer: 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)
+{
+ struct sk_buff_head xmitq;
+ struct tipc_node *n;
+ struct tipc_msg *hdr = buf_msg(skb);
+ int usr = msg_user(hdr);
+ int bearer_id = b->identity;
+ struct tipc_link_entry *le;
+ u16 bc_ack = msg_bcast_ack(hdr);
+ int rc = 0;
+
+ __skb_queue_head_init(&xmitq);
+
+ /* Ensure message is well-formed */
+ if (unlikely(!tipc_msg_validate(skb)))
+ goto discard;
+
+ /* Handle arrival of discovery or broadcast packet */
+ if (unlikely(msg_non_seq(hdr))) {
+ if (unlikely(usr == LINK_CONFIG))
+ return tipc_disc_rcv(net, skb, b);
+ else
+ return tipc_node_bc_rcv(net, skb, bearer_id);
+ }
+
+ /* Locate neighboring node that sent packet */
+ n = tipc_node_find(net, msg_prevnode(hdr));
+ if (unlikely(!n))
+ goto discard;
+ le = &n->links[bearer_id];
+
+ /* Ensure broadcast reception is in synch with peer's send state */
+ if (unlikely(usr == LINK_PROTOCOL))
+ tipc_bcast_sync_rcv(net, n->bc_entry.link, hdr);
+ else if (unlikely(n->bc_entry.link->acked != bc_ack))
+ tipc_bcast_ack_rcv(net, n->bc_entry.link, bc_ack);
+
+ tipc_node_lock(n);
+
+ /* Is reception permitted at the moment ? */
+ if (!tipc_node_filter_pkt(n, hdr))
+ goto unlock;
+
+ /* Check and if necessary update node state */
+ if (likely(tipc_node_check_state(n, skb, bearer_id, &xmitq))) {
+ rc = tipc_link_rcv(le->link, skb, &xmitq);
+ skb = NULL;
+ }
+unlock:
+ tipc_node_unlock(n);
+
+ if (unlikely(rc & TIPC_LINK_UP_EVT))
+ tipc_node_link_up(n, bearer_id, &xmitq);
+
+ if (unlikely(rc & TIPC_LINK_DOWN_EVT))
+ tipc_node_link_down(n, bearer_id, false);
+
+ if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
+ tipc_named_rcv(net, &n->bc_entry.namedq);
+
+ if (!skb_queue_empty(&le->inputq))
+ tipc_sk_rcv(net, &le->inputq);
+
+ if (!skb_queue_empty(&xmitq))
+ tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
+
+ tipc_node_put(n);
+discard:
+ kfree_skb(skb);
+}
+
int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int err;
Code Review / kvmfornfv.git / blobdiff