diff options
-rw-r--r-- | net/tipc/link.c | 124 |
1 files changed, 80 insertions, 44 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index a081e7d08d22..18b1524098c6 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -88,6 +88,8 @@ static void link_print(struct tipc_link *l_ptr, const char *str); static int tipc_link_frag_xmit(struct tipc_link *l_ptr, struct sk_buff *buf); static void tipc_link_sync_xmit(struct tipc_link *l); static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); +static int tipc_link_input(struct tipc_link *l, struct sk_buff *buf); +static int tipc_link_prepare_input(struct tipc_link *l, struct sk_buff **buf); /* * Simple link routines @@ -1458,54 +1460,14 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr) if (unlikely(l_ptr->oldest_deferred_in)) head = link_insert_deferred_queue(l_ptr, head); - /* Deliver packet/message to correct user: */ - if (unlikely(msg_user(msg) == CHANGEOVER_PROTOCOL)) { - if (!tipc_link_tunnel_rcv(n_ptr, &buf)) { - tipc_node_unlock(n_ptr); - continue; - } - msg = buf_msg(buf); - } else if (msg_user(msg) == MSG_FRAGMENTER) { - l_ptr->stats.recv_fragments++; - if (tipc_buf_append(&l_ptr->reasm_buf, &buf)) { - l_ptr->stats.recv_fragmented++; - msg = buf_msg(buf); - } else { - if (!l_ptr->reasm_buf) - tipc_link_reset(l_ptr); - tipc_node_unlock(n_ptr); - continue; - } - } - - switch (msg_user(msg)) { - case TIPC_LOW_IMPORTANCE: - case TIPC_MEDIUM_IMPORTANCE: - case TIPC_HIGH_IMPORTANCE: - case TIPC_CRITICAL_IMPORTANCE: - case CONN_MANAGER: - tipc_node_unlock(n_ptr); - tipc_sk_rcv(buf); - continue; - case MSG_BUNDLER: - l_ptr->stats.recv_bundles++; - l_ptr->stats.recv_bundled += msg_msgcnt(msg); + if (tipc_link_prepare_input(l_ptr, &buf)) { tipc_node_unlock(n_ptr); - tipc_link_bundle_rcv(buf); continue; - case NAME_DISTRIBUTOR: - n_ptr->bclink.recv_permitted = true; - tipc_node_unlock(n_ptr); - tipc_named_rcv(buf); - continue; - case BCAST_PROTOCOL: - tipc_link_sync_rcv(n_ptr, buf); - break; - default: - kfree_skb(buf); - break; } tipc_node_unlock(n_ptr); + msg = buf_msg(buf); + if (tipc_link_input(l_ptr, buf) != 0) + goto discard; continue; unlock_discard: tipc_node_unlock(n_ptr); @@ -1515,6 +1477,80 @@ discard: } /** + * tipc_link_prepare_input - process TIPC link messages + * + * returns nonzero if the message was consumed + * + * Node lock must be held + */ +static int tipc_link_prepare_input(struct tipc_link *l, struct sk_buff **buf) +{ + struct tipc_node *n; + struct tipc_msg *msg; + int res = -EINVAL; + + n = l->owner; + msg = buf_msg(*buf); + switch (msg_user(msg)) { + case CHANGEOVER_PROTOCOL: + if (tipc_link_tunnel_rcv(n, buf)) + res = 0; + break; + case MSG_FRAGMENTER: + l->stats.recv_fragments++; + if (tipc_buf_append(&l->reasm_buf, buf)) { + l->stats.recv_fragmented++; + res = 0; + } else if (!l->reasm_buf) { + tipc_link_reset(l); + } + break; + case MSG_BUNDLER: + l->stats.recv_bundles++; + l->stats.recv_bundled += msg_msgcnt(msg); + res = 0; + break; + case NAME_DISTRIBUTOR: + n->bclink.recv_permitted = true; + res = 0; + break; + case BCAST_PROTOCOL: + tipc_link_sync_rcv(n, *buf); + break; + default: + res = 0; + } + return res; +} +/** + * tipc_link_input - Deliver message too higher layers + */ +static int tipc_link_input(struct tipc_link *l, struct sk_buff *buf) +{ + struct tipc_msg *msg = buf_msg(buf); + int res = 0; + + switch (msg_user(msg)) { + case TIPC_LOW_IMPORTANCE: + case TIPC_MEDIUM_IMPORTANCE: + case TIPC_HIGH_IMPORTANCE: + case TIPC_CRITICAL_IMPORTANCE: + case CONN_MANAGER: + tipc_sk_rcv(buf); + break; + case NAME_DISTRIBUTOR: + tipc_named_rcv(buf); + break; + case MSG_BUNDLER: + tipc_link_bundle_rcv(buf); + break; + default: + res = -EINVAL; + } + return res; +} + +/** * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue * * Returns increase in queue length (i.e. 0 or 1) |