diff options
Diffstat (limited to 'net/tipc/link.c')
| -rw-r--r-- | net/tipc/link.c | 173 |
1 files changed, 84 insertions, 89 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index e8153f6..54163f9 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1507,15 +1507,15 @@ void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *b_ptr) /* Ensure bearer is still enabled */ if (unlikely(!b_ptr->active)) - goto cont; + goto discard; /* Ensure message is well-formed */ if (unlikely(!link_recv_buf_validate(buf))) - goto cont; + goto discard; /* Ensure message data is a single contiguous unit */ if (unlikely(skb_linearize(buf))) - goto cont; + goto discard; /* Handle arrival of a non-unicast link message */ msg = buf_msg(buf); @@ -1531,20 +1531,18 @@ void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *b_ptr) /* Discard unicast link messages destined for another node */ if (unlikely(!msg_short(msg) && (msg_destnode(msg) != tipc_own_addr))) - goto cont; + goto discard; /* Locate neighboring node that sent message */ n_ptr = tipc_node_find(msg_prevnode(msg)); if (unlikely(!n_ptr)) - goto cont; + goto discard; tipc_node_lock(n_ptr); /* Locate unicast link endpoint that should handle message */ l_ptr = n_ptr->links[b_ptr->identity]; - if (unlikely(!l_ptr)) { - tipc_node_unlock(n_ptr); - goto cont; - } + if (unlikely(!l_ptr)) + goto unlock_discard; /* Verify that communication with node is currently allowed */ if ((n_ptr->block_setup & WAIT_PEER_DOWN) && @@ -1554,10 +1552,8 @@ void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *b_ptr) !msg_redundant_link(msg)) n_ptr->block_setup &= ~WAIT_PEER_DOWN; - if (n_ptr->block_setup) { - tipc_node_unlock(n_ptr); - goto cont; - } + if (n_ptr->block_setup) + goto unlock_discard; /* Validate message sequence number info */ seq_no = msg_seqno(msg); @@ -1593,98 +1589,97 @@ void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *b_ptr) /* Now (finally!) process the incoming message */ protocol_check: - if (likely(link_working_working(l_ptr))) { - if (likely(seq_no == mod(l_ptr->next_in_no))) { - l_ptr->next_in_no++; - if (unlikely(l_ptr->oldest_deferred_in)) - head = link_insert_deferred_queue(l_ptr, - head); -deliver: - if (likely(msg_isdata(msg))) { - tipc_node_unlock(n_ptr); - tipc_port_recv_msg(buf); - continue; - } - switch (msg_user(msg)) { - int ret; - case MSG_BUNDLER: - l_ptr->stats.recv_bundles++; - l_ptr->stats.recv_bundled += - msg_msgcnt(msg); - tipc_node_unlock(n_ptr); - tipc_link_recv_bundle(buf); - continue; - case NAME_DISTRIBUTOR: - n_ptr->bclink.recv_permitted = true; - tipc_node_unlock(n_ptr); - tipc_named_recv(buf); - continue; - case BCAST_PROTOCOL: - tipc_link_recv_sync(n_ptr, buf); - tipc_node_unlock(n_ptr); - continue; - case CONN_MANAGER: - tipc_node_unlock(n_ptr); - tipc_port_recv_proto_msg(buf); - continue; - case MSG_FRAGMENTER: - l_ptr->stats.recv_fragments++; - ret = tipc_link_recv_fragment( - &l_ptr->defragm_buf, - &buf, &msg); - if (ret == 1) { - l_ptr->stats.recv_fragmented++; - goto deliver; - } - if (ret == -1) - l_ptr->next_in_no--; - break; - case CHANGEOVER_PROTOCOL: - type = msg_type(msg); - if (link_recv_changeover_msg(&l_ptr, - &buf)) { - msg = buf_msg(buf); - seq_no = msg_seqno(msg); - if (type == ORIGINAL_MSG) - goto deliver; - goto protocol_check; - } - break; - default: - kfree_skb(buf); - buf = NULL; - break; - } + if (unlikely(!link_working_working(l_ptr))) { + if (msg_user(msg) == LINK_PROTOCOL) { + link_recv_proto_msg(l_ptr, buf); + head = link_insert_deferred_queue(l_ptr, head); + tipc_node_unlock(n_ptr); + continue; + } + + /* Traffic message. Conditionally activate link */ + link_state_event(l_ptr, TRAFFIC_MSG_EVT); + + if (link_working_working(l_ptr)) { + /* Re-insert buffer in front of queue */ + buf->next = head; + head = buf; tipc_node_unlock(n_ptr); - tipc_net_route_msg(buf); continue; } + goto unlock_discard; + } + + /* Link is now in state WORKING_WORKING */ + if (unlikely(seq_no != mod(l_ptr->next_in_no))) { link_handle_out_of_seq_msg(l_ptr, buf); head = link_insert_deferred_queue(l_ptr, head); tipc_node_unlock(n_ptr); continue; } - - /* Link is not in state WORKING_WORKING */ - if (msg_user(msg) == LINK_PROTOCOL) { - link_recv_proto_msg(l_ptr, buf); + l_ptr->next_in_no++; + if (unlikely(l_ptr->oldest_deferred_in)) head = link_insert_deferred_queue(l_ptr, head); +deliver: + if (likely(msg_isdata(msg))) { tipc_node_unlock(n_ptr); + tipc_port_recv_msg(buf); continue; } - - /* Traffic message. Conditionally activate link */ - link_state_event(l_ptr, TRAFFIC_MSG_EVT); - - if (link_working_working(l_ptr)) { - /* Re-insert buffer in front of queue */ - buf->next = head; - head = buf; + switch (msg_user(msg)) { + int ret; + case MSG_BUNDLER: + l_ptr->stats.recv_bundles++; + l_ptr->stats.recv_bundled += msg_msgcnt(msg); + tipc_node_unlock(n_ptr); + tipc_link_recv_bundle(buf); + continue; + case NAME_DISTRIBUTOR: + n_ptr->bclink.recv_permitted = true; + tipc_node_unlock(n_ptr); + tipc_named_recv(buf); + continue; + case BCAST_PROTOCOL: + tipc_link_recv_sync(n_ptr, buf); tipc_node_unlock(n_ptr); continue; + case CONN_MANAGER: + tipc_node_unlock(n_ptr); + tipc_port_recv_proto_msg(buf); + continue; + case MSG_FRAGMENTER: + l_ptr->stats.recv_fragments++; + ret = tipc_link_recv_fragment(&l_ptr->defragm_buf, + &buf, &msg); + if (ret == 1) { + l_ptr->stats.recv_fragmented++; + goto deliver; + } + if (ret == -1) + l_ptr->next_in_no--; + break; + case CHANGEOVER_PROTOCOL: + type = msg_type(msg); + if (link_recv_changeover_msg(&l_ptr, &buf)) { + msg = buf_msg(buf); + seq_no = msg_seqno(msg); + if (type == ORIGINAL_MSG) + goto deliver; + goto protocol_check; + } + break; + default: + kfree_skb(buf); + buf = NULL; + break; } tipc_node_unlock(n_ptr); -cont: + tipc_net_route_msg(buf); + continue; +unlock_discard: + + tipc_node_unlock(n_ptr); +discard: kfree_skb(buf); } read_unlock_bh(&tipc_net_lock); |