| /* |
| * net/tipc/link.c: TIPC link code |
| * |
| * Copyright (c) 1996-2007, 2012-2016, Ericsson AB |
| * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the names of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "core.h" |
| #include "subscr.h" |
| #include "link.h" |
| #include "bcast.h" |
| #include "socket.h" |
| #include "name_distr.h" |
| #include "discover.h" |
| #include "netlink.h" |
| #include "monitor.h" |
| #include "trace.h" |
| |
| #include <linux/pkt_sched.h> |
| |
| struct tipc_stats { |
| u32 sent_pkts; |
| u32 recv_pkts; |
| u32 sent_states; |
| u32 recv_states; |
| u32 sent_probes; |
| u32 recv_probes; |
| u32 sent_nacks; |
| u32 recv_nacks; |
| u32 sent_acks; |
| u32 sent_bundled; |
| u32 sent_bundles; |
| u32 recv_bundled; |
| u32 recv_bundles; |
| u32 retransmitted; |
| u32 sent_fragmented; |
| u32 sent_fragments; |
| u32 recv_fragmented; |
| u32 recv_fragments; |
| u32 link_congs; /* # port sends blocked by congestion */ |
| u32 deferred_recv; |
| u32 duplicates; |
| u32 max_queue_sz; /* send queue size high water mark */ |
| u32 accu_queue_sz; /* used for send queue size profiling */ |
| u32 queue_sz_counts; /* used for send queue size profiling */ |
| u32 msg_length_counts; /* used for message length profiling */ |
| u32 msg_lengths_total; /* used for message length profiling */ |
| u32 msg_length_profile[7]; /* used for msg. length profiling */ |
| }; |
| |
| /** |
| * struct tipc_link - TIPC link data structure |
| * @addr: network address of link's peer node |
| * @name: link name character string |
| * @media_addr: media address to use when sending messages over link |
| * @timer: link timer |
| * @net: pointer to namespace struct |
| * @refcnt: reference counter for permanent references (owner node & timer) |
| * @peer_session: link session # being used by peer end of link |
| * @peer_bearer_id: bearer id used by link's peer endpoint |
| * @bearer_id: local bearer id used by link |
| * @tolerance: minimum link continuity loss needed to reset link [in ms] |
| * @abort_limit: # of unacknowledged continuity probes needed to reset link |
| * @state: current state of link FSM |
| * @peer_caps: bitmap describing capabilities of peer node |
| * @silent_intv_cnt: # of timer intervals without any reception from peer |
| * @proto_msg: template for control messages generated by link |
| * @pmsg: convenience pointer to "proto_msg" field |
| * @priority: current link priority |
| * @net_plane: current link network plane ('A' through 'H') |
| * @mon_state: cookie with information needed by link monitor |
| * @backlog_limit: backlog queue congestion thresholds (indexed by importance) |
| * @exp_msg_count: # of tunnelled messages expected during link changeover |
| * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset |
| * @mtu: current maximum packet size for this link |
| * @advertised_mtu: advertised own mtu when link is being established |
| * @transmitq: queue for sent, non-acked messages |
| * @backlogq: queue for messages waiting to be sent |
| * @snt_nxt: next sequence number to use for outbound messages |
| * @prev_from: sequence number of most previous retransmission request |
| * @stale_cnt: counter for number of identical retransmit attempts |
| * @stale_limit: time when repeated identical retransmits must force link reset |
| * @ackers: # of peers that needs to ack each packet before it can be released |
| * @acked: # last packet acked by a certain peer. Used for broadcast. |
| * @rcv_nxt: next sequence number to expect for inbound messages |
| * @deferred_queue: deferred queue saved OOS b'cast message received from node |
| * @unacked_window: # of inbound messages rx'd without ack'ing back to peer |
| * @inputq: buffer queue for messages to be delivered upwards |
| * @namedq: buffer queue for name table messages to be delivered upwards |
| * @next_out: ptr to first unsent outbound message in queue |
| * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate |
| * @long_msg_seq_no: next identifier to use for outbound fragmented messages |
| * @reasm_buf: head of partially reassembled inbound message fragments |
| * @bc_rcvr: marks that this is a broadcast receiver link |
| * @stats: collects statistics regarding link activity |
| */ |
| struct tipc_link { |
| u32 addr; |
| char name[TIPC_MAX_LINK_NAME]; |
| struct net *net; |
| |
| /* Management and link supervision data */ |
| u16 peer_session; |
| u16 session; |
| u16 snd_nxt_state; |
| u16 rcv_nxt_state; |
| u32 peer_bearer_id; |
| u32 bearer_id; |
| u32 tolerance; |
| u32 abort_limit; |
| u32 state; |
| u16 peer_caps; |
| bool in_session; |
| bool active; |
| u32 silent_intv_cnt; |
| char if_name[TIPC_MAX_IF_NAME]; |
| u32 priority; |
| char net_plane; |
| struct tipc_mon_state mon_state; |
| u16 rst_cnt; |
| |
| /* Failover/synch */ |
| u16 drop_point; |
| struct sk_buff *failover_reasm_skb; |
| struct sk_buff_head failover_deferdq; |
| |
| /* Max packet negotiation */ |
| u16 mtu; |
| u16 advertised_mtu; |
| |
| /* Sending */ |
| struct sk_buff_head transmq; |
| struct sk_buff_head backlogq; |
| struct { |
| u16 len; |
| u16 limit; |
| } backlog[5]; |
| u16 snd_nxt; |
| u16 prev_from; |
| u16 window; |
| u16 stale_cnt; |
| unsigned long stale_limit; |
| |
| /* Reception */ |
| u16 rcv_nxt; |
| u32 rcv_unacked; |
| struct sk_buff_head deferdq; |
| struct sk_buff_head *inputq; |
| struct sk_buff_head *namedq; |
| |
| /* Congestion handling */ |
| struct sk_buff_head wakeupq; |
| |
| /* Fragmentation/reassembly */ |
| struct sk_buff *reasm_buf; |
| |
| /* Broadcast */ |
| u16 ackers; |
| u16 acked; |
| struct tipc_link *bc_rcvlink; |
| struct tipc_link *bc_sndlink; |
| u8 nack_state; |
| bool bc_peer_is_up; |
| |
| /* Statistics */ |
| struct tipc_stats stats; |
| }; |
| |
| /* |
| * Error message prefixes |
| */ |
| static const char *link_co_err = "Link tunneling error, "; |
| static const char *link_rst_msg = "Resetting link "; |
| |
| /* Send states for broadcast NACKs |
| */ |
| enum { |
| BC_NACK_SND_CONDITIONAL, |
| BC_NACK_SND_UNCONDITIONAL, |
| BC_NACK_SND_SUPPRESS, |
| }; |
| |
| #define TIPC_BC_RETR_LIM msecs_to_jiffies(10) /* [ms] */ |
| #define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1)) |
| |
| /* |
| * Interval between NACKs when packets arrive out of order |
| */ |
| #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) |
| |
| /* Link FSM states: |
| */ |
| enum { |
| 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_is_up(struct tipc_link *l) |
| { |
| 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 tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
| bool probe_reply, u16 rcvgap, |
| int tolerance, int priority, |
| struct sk_buff_head *xmitq); |
| static void link_print(struct tipc_link *l, const char *str); |
| static int tipc_link_build_nack_msg(struct tipc_link *l, |
| struct sk_buff_head *xmitq); |
| static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
| struct sk_buff_head *xmitq); |
| static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); |
| static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data); |
| static void tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap, |
| struct tipc_gap_ack_blks *ga, |
| struct sk_buff_head *xmitq); |
| |
| /* |
| * Simple non-static link routines (i.e. referenced outside this file) |
| */ |
| bool tipc_link_is_up(struct tipc_link *l) |
| { |
| return link_is_up(l); |
| } |
| |
| bool tipc_link_peer_is_down(struct tipc_link *l) |
| { |
| return l->state == LINK_PEER_RESET; |
| } |
| |
| bool tipc_link_is_reset(struct tipc_link *l) |
| { |
| return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); |
| } |
| |
| bool tipc_link_is_establishing(struct tipc_link *l) |
| { |
| return l->state == LINK_ESTABLISHING; |
| } |
| |
| bool tipc_link_is_synching(struct tipc_link *l) |
| { |
| return l->state == LINK_SYNCHING; |
| } |
| |
| bool tipc_link_is_failingover(struct tipc_link *l) |
| { |
| return l->state == LINK_FAILINGOVER; |
| } |
| |
| bool tipc_link_is_blocked(struct tipc_link *l) |
| { |
| return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); |
| } |
| |
| static bool link_is_bc_sndlink(struct tipc_link *l) |
| { |
| return !l->bc_sndlink; |
| } |
| |
| static bool link_is_bc_rcvlink(struct tipc_link *l) |
| { |
| return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); |
| } |
| |
| void tipc_link_set_active(struct tipc_link *l, bool active) |
| { |
| l->active = active; |
| } |
| |
| u32 tipc_link_id(struct tipc_link *l) |
| { |
| return l->peer_bearer_id << 16 | l->bearer_id; |
| } |
| |
| int tipc_link_window(struct tipc_link *l) |
| { |
| return l->window; |
| } |
| |
| int tipc_link_prio(struct tipc_link *l) |
| { |
| return l->priority; |
| } |
| |
| unsigned long tipc_link_tolerance(struct tipc_link *l) |
| { |
| return l->tolerance; |
| } |
| |
| struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) |
| { |
| return l->inputq; |
| } |
| |
| char tipc_link_plane(struct tipc_link *l) |
| { |
| return l->net_plane; |
| } |
| |
| void tipc_link_update_caps(struct tipc_link *l, u16 capabilities) |
| { |
| l->peer_caps = capabilities; |
| } |
| |
| void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
| struct tipc_link *uc_l, |
| struct sk_buff_head *xmitq) |
| { |
| struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
| |
| snd_l->ackers++; |
| rcv_l->acked = snd_l->snd_nxt - 1; |
| snd_l->state = LINK_ESTABLISHED; |
| tipc_link_build_bc_init_msg(uc_l, xmitq); |
| } |
| |
| void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
| struct tipc_link *rcv_l, |
| struct sk_buff_head *xmitq) |
| { |
| u16 ack = snd_l->snd_nxt - 1; |
| |
| snd_l->ackers--; |
| rcv_l->bc_peer_is_up = true; |
| rcv_l->state = LINK_ESTABLISHED; |
| tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); |
| trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!"); |
| tipc_link_reset(rcv_l); |
| rcv_l->state = LINK_RESET; |
| if (!snd_l->ackers) { |
| trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!"); |
| tipc_link_reset(snd_l); |
| snd_l->state = LINK_RESET; |
| __skb_queue_purge(xmitq); |
| } |
| } |
| |
| int tipc_link_bc_peers(struct tipc_link *l) |
| { |
| return l->ackers; |
| } |
| |
| static u16 link_bc_rcv_gap(struct tipc_link *l) |
| { |
| struct sk_buff *skb = skb_peek(&l->deferdq); |
| u16 gap = 0; |
| |
| if (more(l->snd_nxt, l->rcv_nxt)) |
| gap = l->snd_nxt - l->rcv_nxt; |
| if (skb) |
| gap = buf_seqno(skb) - l->rcv_nxt; |
| return gap; |
| } |
| |
| void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
| { |
| l->mtu = mtu; |
| } |
| |
| int tipc_link_mtu(struct tipc_link *l) |
| { |
| return l->mtu; |
| } |
| |
| u16 tipc_link_rcv_nxt(struct tipc_link *l) |
| { |
| return l->rcv_nxt; |
| } |
| |
| u16 tipc_link_acked(struct tipc_link *l) |
| { |
| return l->acked; |
| } |
| |
| char *tipc_link_name(struct tipc_link *l) |
| { |
| return l->name; |
| } |
| |
| u32 tipc_link_state(struct tipc_link *l) |
| { |
| return l->state; |
| } |
| |
| /** |
| * tipc_link_create - create a new link |
| * @n: pointer to associated node |
| * @if_name: associated interface name |
| * @bearer_id: id (index) of associated bearer |
| * @tolerance: link tolerance to be used by link |
| * @net_plane: network plane (A,B,c..) this link belongs to |
| * @mtu: mtu to be advertised by link |
| * @priority: priority to be used by link |
| * @window: send window to be used by link |
| * @session: session to be used by link |
| * @ownnode: identity of own node |
| * @peer: node id of peer node |
| * @peer_caps: bitmap describing peer node capabilities |
| * @bc_sndlink: the namespace global link used for broadcast sending |
| * @bc_rcvlink: the peer specific link used for broadcast reception |
| * @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 |
| */ |
| bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
| int tolerance, char net_plane, u32 mtu, int priority, |
| int window, u32 session, u32 self, |
| u32 peer, u8 *peer_id, u16 peer_caps, |
| struct tipc_link *bc_sndlink, |
| struct tipc_link *bc_rcvlink, |
| struct sk_buff_head *inputq, |
| struct sk_buff_head *namedq, |
| struct tipc_link **link) |
| { |
| char peer_str[NODE_ID_STR_LEN] = {0,}; |
| char self_str[NODE_ID_STR_LEN] = {0,}; |
| struct tipc_link *l; |
| |
| l = kzalloc(sizeof(*l), GFP_ATOMIC); |
| if (!l) |
| return false; |
| *link = l; |
| l->session = session; |
| |
| /* Set link name for unicast links only */ |
| if (peer_id) { |
| tipc_nodeid2string(self_str, tipc_own_id(net)); |
| if (strlen(self_str) > 16) |
| sprintf(self_str, "%x", self); |
| tipc_nodeid2string(peer_str, peer_id); |
| if (strlen(peer_str) > 16) |
| sprintf(peer_str, "%x", peer); |
| } |
| /* Peer i/f name will be completed by reset/activate message */ |
| snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown", |
| self_str, if_name, peer_str); |
| |
| strcpy(l->if_name, if_name); |
| l->addr = peer; |
| l->peer_caps = peer_caps; |
| l->net = net; |
| l->in_session = false; |
| l->bearer_id = bearer_id; |
| l->tolerance = tolerance; |
| if (bc_rcvlink) |
| bc_rcvlink->tolerance = tolerance; |
| l->net_plane = net_plane; |
| l->advertised_mtu = mtu; |
| l->mtu = mtu; |
| l->priority = priority; |
| tipc_link_set_queue_limits(l, window); |
| l->ackers = 1; |
| l->bc_sndlink = bc_sndlink; |
| l->bc_rcvlink = bc_rcvlink; |
| l->inputq = inputq; |
| l->namedq = namedq; |
| l->state = LINK_RESETTING; |
| __skb_queue_head_init(&l->transmq); |
| __skb_queue_head_init(&l->backlogq); |
| __skb_queue_head_init(&l->deferdq); |
| __skb_queue_head_init(&l->failover_deferdq); |
| skb_queue_head_init(&l->wakeupq); |
| skb_queue_head_init(l->inputq); |
| return true; |
| } |
| |
| /** |
| * tipc_link_bc_create - create new link to be used for broadcast |
| * @n: pointer to associated node |
| * @mtu: mtu to be used initially if no peers |
| * @window: send window 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 |
| */ |
| bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
| int mtu, int window, u16 peer_caps, |
| struct sk_buff_head *inputq, |
| struct sk_buff_head *namedq, |
| struct tipc_link *bc_sndlink, |
| struct tipc_link **link) |
| { |
| struct tipc_link *l; |
| |
| if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
| 0, ownnode, peer, NULL, peer_caps, bc_sndlink, |
| NULL, inputq, namedq, link)) |
| return false; |
| |
| l = *link; |
| strcpy(l->name, tipc_bclink_name); |
| trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!"); |
| tipc_link_reset(l); |
| l->state = LINK_RESET; |
| l->ackers = 0; |
| l->bc_rcvlink = l; |
| |
| /* Broadcast send link is always up */ |
| if (link_is_bc_sndlink(l)) |
| l->state = LINK_ESTABLISHED; |
| |
| /* Disable replicast if even a single peer doesn't support it */ |
| if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) |
| tipc_bcast_disable_rcast(net); |
| |
| return true; |
| } |
| |
| /** |
| * tipc_link_fsm_evt - link finite state machine |
| * @l: pointer to link |
| * @evt: state machine event to be processed |
| */ |
| int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
| { |
| int rc = 0; |
| int old_state = l->state; |
| |
| switch (l->state) { |
| case LINK_RESETTING: |
| switch (evt) { |
| case LINK_PEER_RESET_EVT: |
| l->state = LINK_PEER_RESET; |
| break; |
| case LINK_RESET_EVT: |
| l->state = LINK_RESET; |
| break; |
| 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 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: |
| goto illegal_evt; |
| } |
| break; |
| case LINK_PEER_RESET: |
| switch (evt) { |
| case LINK_RESET_EVT: |
| l->state = LINK_ESTABLISHING; |
| break; |
| case LINK_PEER_RESET_EVT: |
| case LINK_ESTABLISH_EVT: |
| case LINK_FAILURE_EVT: |
| break; |
| 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: |
| goto illegal_evt; |
| } |
| break; |
| case LINK_ESTABLISHING: |
| switch (evt) { |
| case LINK_ESTABLISH_EVT: |
| l->state = LINK_ESTABLISHED; |
| break; |
| case LINK_FAILOVER_BEGIN_EVT: |
| l->state = LINK_FAILINGOVER; |
| break; |
| case LINK_RESET_EVT: |
| l->state = LINK_RESET; |
| break; |
| case LINK_FAILURE_EVT: |
| case LINK_PEER_RESET_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 LINK_ESTABLISH_EVT: |
| case LINK_SYNCH_END_EVT: |
| break; |
| case LINK_SYNCH_BEGIN_EVT: |
| l->state = LINK_SYNCHING; |
| break; |
| case LINK_FAILOVER_BEGIN_EVT: |
| case LINK_FAILOVER_END_EVT: |
| default: |
| goto illegal_evt; |
| } |
| break; |
| case LINK_SYNCHING: |
| 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 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: |
| goto illegal_evt; |
| } |
| break; |
| default: |
| pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
| } |
| trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
| return rc; |
| illegal_evt: |
| pr_err("Illegal FSM event %x in state %x on link %s\n", |
| evt, l->state, l->name); |
| trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
| return rc; |
| } |
| |
| /* link_profile_stats - update statistical profiling of traffic |
| */ |
| static void link_profile_stats(struct tipc_link *l) |
| { |
| struct sk_buff *skb; |
| struct tipc_msg *msg; |
| int length; |
| |
| /* Update counters used in statistical profiling of send traffic */ |
| l->stats.accu_queue_sz += skb_queue_len(&l->transmq); |
| l->stats.queue_sz_counts++; |
| |
| skb = skb_peek(&l->transmq); |
| if (!skb) |
| return; |
| msg = buf_msg(skb); |
| length = msg_size(msg); |
| |
| if (msg_user(msg) == MSG_FRAGMENTER) { |
| if (msg_type(msg) != FIRST_FRAGMENT) |
| return; |
| length = msg_size(msg_get_wrapped(msg)); |
| } |
| l->stats.msg_lengths_total += length; |
| l->stats.msg_length_counts++; |
| if (length <= 64) |
| l->stats.msg_length_profile[0]++; |
| else if (length <= 256) |
| l->stats.msg_length_profile[1]++; |
| else if (length <= 1024) |
| l->stats.msg_length_profile[2]++; |
| else if (length <= 4096) |
| l->stats.msg_length_profile[3]++; |
| else if (length <= 16384) |
| l->stats.msg_length_profile[4]++; |
| else if (length <= 32768) |
| l->stats.msg_length_profile[5]++; |
| else |
| l->stats.msg_length_profile[6]++; |
| } |
| |
| /** |
| * tipc_link_too_silent - check if link is "too silent" |
| * @l: tipc link to be checked |
| * |
| * Returns true if the link 'silent_intv_cnt' is about to reach the |
| * 'abort_limit' value, otherwise false |
| */ |
| bool tipc_link_too_silent(struct tipc_link *l) |
| { |
| return (l->silent_intv_cnt + 2 > l->abort_limit); |
| } |
| |
| /* tipc_link_timeout - perform periodic task as instructed from node timeout |
| */ |
| int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) |
| { |
| int mtyp = 0; |
| int rc = 0; |
| bool state = false; |
| bool probe = false; |
| bool setup = false; |
| u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
| u16 bc_acked = l->bc_rcvlink->acked; |
| struct tipc_mon_state *mstate = &l->mon_state; |
| |
| trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " "); |
| trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " "); |
| switch (l->state) { |
| case LINK_ESTABLISHED: |
| case LINK_SYNCHING: |
| mtyp = STATE_MSG; |
| link_profile_stats(l); |
| tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); |
| if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) |
| return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
| state = bc_acked != bc_snt; |
| state |= l->bc_rcvlink->rcv_unacked; |
| state |= l->rcv_unacked; |
| state |= !skb_queue_empty(&l->transmq); |
| state |= !skb_queue_empty(&l->deferdq); |
| probe = mstate->probing; |
| probe |= l->silent_intv_cnt; |
| if (probe || mstate->monitoring) |
| l->silent_intv_cnt++; |
| break; |
| case LINK_RESET: |
| setup = l->rst_cnt++ <= 4; |
| setup |= !(l->rst_cnt % 16); |
| mtyp = RESET_MSG; |
| break; |
| case LINK_ESTABLISHING: |
| setup = true; |
| mtyp = ACTIVATE_MSG; |
| break; |
| case LINK_PEER_RESET: |
| case LINK_RESETTING: |
| case LINK_FAILINGOVER: |
| break; |
| default: |
| break; |
| } |
| |
| if (state || probe || setup) |
| tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); |
| |
| return rc; |
| } |
| |
| /** |
| * link_schedule_user - schedule a message sender for wakeup after congestion |
| * @l: congested link |
| * @hdr: header of message that is being sent |
| * Create pseudo msg to send back to user when congestion abates |
| */ |
| static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) |
| { |
| u32 dnode = tipc_own_addr(l->net); |
| u32 dport = msg_origport(hdr); |
| struct sk_buff *skb; |
| |
| /* Create and schedule wakeup pseudo message */ |
| skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, |
| dnode, l->addr, dport, 0, 0); |
| if (!skb) |
| return -ENOBUFS; |
| msg_set_dest_droppable(buf_msg(skb), true); |
| TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); |
| skb_queue_tail(&l->wakeupq, skb); |
| l->stats.link_congs++; |
| trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!"); |
| return -ELINKCONG; |
| } |
| |
| /** |
| * link_prepare_wakeup - prepare users for wakeup after congestion |
| * @l: congested link |
| * Wake up a number of waiting users, as permitted by available space |
| * in the send queue |
| */ |
| static void link_prepare_wakeup(struct tipc_link *l) |
| { |
| struct sk_buff *skb, *tmp; |
| int imp, i = 0; |
| |
| skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
| imp = TIPC_SKB_CB(skb)->chain_imp; |
| if (l->backlog[imp].len < l->backlog[imp].limit) { |
| skb_unlink(skb, &l->wakeupq); |
| skb_queue_tail(l->inputq, skb); |
| } else if (i++ > 10) { |
| break; |
| } |
| } |
| } |
| |
| void tipc_link_reset(struct tipc_link *l) |
| { |
| struct sk_buff_head list; |
| |
| __skb_queue_head_init(&list); |
| |
| l->in_session = false; |
| /* Force re-synch of peer session number before establishing */ |
| l->peer_session--; |
| l->session++; |
| l->mtu = l->advertised_mtu; |
| |
| spin_lock_bh(&l->wakeupq.lock); |
| skb_queue_splice_init(&l->wakeupq, &list); |
| spin_unlock_bh(&l->wakeupq.lock); |
| |
| spin_lock_bh(&l->inputq->lock); |
| skb_queue_splice_init(&list, l->inputq); |
| spin_unlock_bh(&l->inputq->lock); |
| |
| __skb_queue_purge(&l->transmq); |
| __skb_queue_purge(&l->deferdq); |
| __skb_queue_purge(&l->backlogq); |
| __skb_queue_purge(&l->failover_deferdq); |
| l->backlog[TIPC_LOW_IMPORTANCE].len = 0; |
| l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; |
| l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; |
| l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; |
| l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; |
| 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->snd_nxt_state = 1; |
| l->rcv_nxt_state = 1; |
| l->acked = 0; |
| l->silent_intv_cnt = 0; |
| l->rst_cnt = 0; |
| l->stale_cnt = 0; |
| l->bc_peer_is_up = false; |
| memset(&l->mon_state, 0, sizeof(l->mon_state)); |
| tipc_link_reset_stats(l); |
| } |
| |
| /** |
| * tipc_link_xmit(): enqueue buffer list according to queue situation |
| * @link: link to use |
| * @list: chain of buffers containing message |
| * @xmitq: returned list of packets to be sent by caller |
| * |
| * Consumes the buffer chain. |
| * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
| * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted |
| */ |
| int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, |
| struct sk_buff_head *xmitq) |
| { |
| struct tipc_msg *hdr = buf_msg(skb_peek(list)); |
| unsigned int maxwin = l->window; |
| int imp = msg_importance(hdr); |
| unsigned int mtu = l->mtu; |
| u16 ack = l->rcv_nxt - 1; |
| u16 seqno = l->snd_nxt; |
| u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
| struct sk_buff_head *transmq = &l->transmq; |
| struct sk_buff_head *backlogq = &l->backlogq; |
| struct sk_buff *skb, *_skb, *bskb; |
| int pkt_cnt = skb_queue_len(list); |
| int rc = 0; |
| |
| if (unlikely(msg_size(hdr) > mtu)) { |
| skb_queue_purge(list); |
| return -EMSGSIZE; |
| } |
| |
| /* Allow oversubscription of one data msg per source at congestion */ |
| if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { |
| if (imp == TIPC_SYSTEM_IMPORTANCE) { |
| pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); |
| return -ENOBUFS; |
| } |
| rc = link_schedule_user(l, hdr); |
| } |
| |
| if (pkt_cnt > 1) { |
| l->stats.sent_fragmented++; |
| l->stats.sent_fragments += pkt_cnt; |
| } |
| |
| /* Prepare each packet for sending, and add to relevant queue: */ |
| while (skb_queue_len(list)) { |
| skb = skb_peek(list); |
| hdr = buf_msg(skb); |
| msg_set_seqno(hdr, seqno); |
| msg_set_ack(hdr, ack); |
| msg_set_bcast_ack(hdr, bc_ack); |
| |
| if (likely(skb_queue_len(transmq) < maxwin)) { |
| _skb = skb_clone(skb, GFP_ATOMIC); |
| if (!_skb) { |
| skb_queue_purge(list); |
| return -ENOBUFS; |
| } |
| __skb_dequeue(list); |
| __skb_queue_tail(transmq, skb); |
| /* next retransmit attempt */ |
| if (link_is_bc_sndlink(l)) |
| TIPC_SKB_CB(skb)->nxt_retr = |
| jiffies + TIPC_BC_RETR_LIM; |
| __skb_queue_tail(xmitq, _skb); |
| TIPC_SKB_CB(skb)->ackers = l->ackers; |
| l->rcv_unacked = 0; |
| l->stats.sent_pkts++; |
| seqno++; |
| continue; |
| } |
| if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { |
| kfree_skb(__skb_dequeue(list)); |
| l->stats.sent_bundled++; |
| continue; |
| } |
| if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { |
| kfree_skb(__skb_dequeue(list)); |
| __skb_queue_tail(backlogq, bskb); |
| l->backlog[msg_importance(buf_msg(bskb))].len++; |
| l->stats.sent_bundled++; |
| l->stats.sent_bundles++; |
| continue; |
| } |
| l->backlog[imp].len += skb_queue_len(list); |
| skb_queue_splice_tail_init(list, backlogq); |
| } |
| l->snd_nxt = seqno; |
| return rc; |
| } |
| |
| static 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; |
| u16 bc_ack = l->bc_rcvlink->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); |
| /* next retransmit attempt */ |
| if (link_is_bc_sndlink(l)) |
| TIPC_SKB_CB(skb)->nxt_retr = jiffies + TIPC_BC_RETR_LIM; |
| |
| __skb_queue_tail(xmitq, _skb); |
| TIPC_SKB_CB(skb)->ackers = l->ackers; |
| msg_set_seqno(hdr, seqno); |
| msg_set_ack(hdr, ack); |
| msg_set_bcast_ack(hdr, bc_ack); |
| l->rcv_unacked = 0; |
| l->stats.sent_pkts++; |
| seqno++; |
| } |
| l->snd_nxt = seqno; |
| } |
| |
| static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
| { |
| struct tipc_msg *hdr = buf_msg(skb); |
| |
| pr_warn("Retransmission failure on link <%s>\n", l->name); |
| link_print(l, "State of link "); |
| pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", |
| msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); |
| pr_info("sqno %u, prev: %x, src: %x\n", |
| msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); |
| } |
| |
| /* tipc_link_retrans() - retransmit one or more packets |
| * @l: the link to transmit on |
| * @r: the receiving link ordering the retransmit. Same as l if unicast |
| * @from: retransmit from (inclusive) this sequence number |
| * @to: retransmit to (inclusive) this sequence number |
| * xmitq: queue for accumulating the retransmitted packets |
| */ |
| static int tipc_link_retrans(struct tipc_link *l, struct tipc_link *r, |
| u16 from, u16 to, struct sk_buff_head *xmitq) |
| { |
| struct sk_buff *_skb, *skb = skb_peek(&l->transmq); |
| u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
| u16 ack = l->rcv_nxt - 1; |
| struct tipc_msg *hdr; |
| |
| if (!skb) |
| return 0; |
| if (less(to, from)) |
| return 0; |
| |
| trace_tipc_link_retrans(r, from, to, &l->transmq); |
| /* Detect repeated retransmit failures on same packet */ |
| if (r->prev_from != from) { |
| r->prev_from = from; |
| r->stale_limit = jiffies + msecs_to_jiffies(r->tolerance); |
| r->stale_cnt = 0; |
| } else if (++r->stale_cnt > 99 && time_after(jiffies, r->stale_limit)) { |
| link_retransmit_failure(l, skb); |
| trace_tipc_list_dump(&l->transmq, true, "retrans failure!"); |
| trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!"); |
| trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!"); |
| if (link_is_bc_sndlink(l)) |
| return TIPC_LINK_DOWN_EVT; |
| return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
| } |
| |
| skb_queue_walk(&l->transmq, skb) { |
| hdr = buf_msg(skb); |
| if (less(msg_seqno(hdr), from)) |
| continue; |
| if (more(msg_seqno(hdr), to)) |
| break; |
| if (link_is_bc_sndlink(l)) { |
| if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) |
| continue; |
| TIPC_SKB_CB(skb)->nxt_retr = jiffies + TIPC_BC_RETR_LIM; |
| } |
| _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); |
| if (!_skb) |
| return 0; |
| hdr = buf_msg(_skb); |
| msg_set_ack(hdr, ack); |
| msg_set_bcast_ack(hdr, bc_ack); |
| _skb->priority = TC_PRIO_CONTROL; |
| __skb_queue_tail(xmitq, _skb); |
| l->stats.retransmitted++; |
| } |
| return 0; |
| } |
| |
| /* 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 *l, struct sk_buff *skb, |
| struct sk_buff_head *inputq) |
| { |
| struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; |
| struct tipc_msg *hdr = buf_msg(skb); |
| |
| switch (msg_user(hdr)) { |
| case TIPC_LOW_IMPORTANCE: |
| case TIPC_MEDIUM_IMPORTANCE: |
| case TIPC_HIGH_IMPORTANCE: |
| case TIPC_CRITICAL_IMPORTANCE: |
| if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { |
| skb_queue_tail(mc_inputq, skb); |
| return true; |
| } |
| /* fall through */ |
| case CONN_MANAGER: |
| skb_queue_tail(inputq, skb); |
| return true; |
| case GROUP_PROTOCOL: |
| skb_queue_tail(mc_inputq, skb); |
| return true; |
| case NAME_DISTRIBUTOR: |
| l->bc_rcvlink->state = LINK_ESTABLISHED; |
| skb_queue_tail(l->namedq, skb); |
| return true; |
| case MSG_BUNDLER: |
| case TUNNEL_PROTOCOL: |
| case MSG_FRAGMENTER: |
| case BCAST_PROTOCOL: |
| return false; |
| default: |
| pr_warn("Dropping received illegal msg type\n"); |
| kfree_skb(skb); |
| return true; |
| }; |
| } |
| |
| /* tipc_link_input - process packet that has passed link protocol check |
| * |
| * Consumes buffer |
| */ |
| static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
| struct sk_buff_head *inputq, |
| struct sk_buff **reasm_skb) |
| { |
| struct tipc_msg *hdr = buf_msg(skb); |
| struct sk_buff *iskb; |
| struct sk_buff_head tmpq; |
| int usr = msg_user(hdr); |
| int pos = 0; |
| |
| if (usr == MSG_BUNDLER) { |
| skb_queue_head_init(&tmpq); |
| l->stats.recv_bundles++; |
| l->stats.recv_bundled += msg_msgcnt(hdr); |
| while (tipc_msg_extract(skb, &iskb, &pos)) |
| tipc_data_input(l, iskb, &tmpq); |
| tipc_skb_queue_splice_tail(&tmpq, 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 && !link_is_bc_rcvlink(l)) { |
| pr_warn_ratelimited("Unable to build fragment list\n"); |
| return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
| } |
| return 0; |
| } else if (usr == BCAST_PROTOCOL) { |
| tipc_bcast_lock(l->net); |
| tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
| tipc_bcast_unlock(l->net); |
| } |
| |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| /* tipc_link_tnl_rcv() - receive TUNNEL_PROTOCOL message, drop or process the |
| * inner message along with the ones in the old link's |
| * deferdq |
| * @l: tunnel link |
| * @skb: TUNNEL_PROTOCOL message |
| * @inputq: queue to put messages ready for delivery |
| */ |
| static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb, |
| struct sk_buff_head *inputq) |
| { |
| struct sk_buff **reasm_skb = &l->failover_reasm_skb; |
| struct sk_buff_head *fdefq = &l->failover_deferdq; |
| struct tipc_msg *hdr = buf_msg(skb); |
| struct sk_buff *iskb; |
| int ipos = 0; |
| int rc = 0; |
| u16 seqno; |
| |
| /* SYNCH_MSG */ |
| if (msg_type(hdr) == SYNCH_MSG) |
| goto drop; |
| |
| /* FAILOVER_MSG */ |
| if (!tipc_msg_extract(skb, &iskb, &ipos)) { |
| pr_warn_ratelimited("Cannot extract FAILOVER_MSG, defq: %d\n", |
| skb_queue_len(fdefq)); |
| return rc; |
| } |
| |
| do { |
| seqno = buf_seqno(iskb); |
| |
| if (unlikely(less(seqno, l->drop_point))) { |
| kfree_skb(iskb); |
| continue; |
| } |
| |
| if (unlikely(seqno != l->drop_point)) { |
| __tipc_skb_queue_sorted(fdefq, seqno, iskb); |
| continue; |
| } |
| |
| l->drop_point++; |
| |
| if (!tipc_data_input(l, iskb, inputq)) |
| rc |= tipc_link_input(l, iskb, inputq, reasm_skb); |
| if (unlikely(rc)) |
| break; |
| } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point))); |
| |
| drop: |
| kfree_skb(skb); |
| return rc; |
| } |
| |
| 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_build_gap_ack_blks - build Gap ACK blocks |
| * @l: tipc link that data have come with gaps in sequence if any |
| * @data: data buffer to store the Gap ACK blocks after built |
| * |
| * returns the actual allocated memory size |
| */ |
| static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data) |
| { |
| struct sk_buff *skb = skb_peek(&l->deferdq); |
| struct tipc_gap_ack_blks *ga = data; |
| u16 len, expect, seqno = 0; |
| u8 n = 0; |
| |
| if (!skb) |
| goto exit; |
| |
| expect = buf_seqno(skb); |
| skb_queue_walk(&l->deferdq, skb) { |
| seqno = buf_seqno(skb); |
| if (unlikely(more(seqno, expect))) { |
| ga->gacks[n].ack = htons(expect - 1); |
| ga->gacks[n].gap = htons(seqno - expect); |
| if (++n >= MAX_GAP_ACK_BLKS) { |
| pr_info_ratelimited("Too few Gap ACK blocks!\n"); |
| goto exit; |
| } |
| } else if (unlikely(less(seqno, expect))) { |
| pr_warn("Unexpected skb in deferdq!\n"); |
| continue; |
| } |
| expect = seqno + 1; |
| } |
| |
| /* last block */ |
| ga->gacks[n].ack = htons(seqno); |
| ga->gacks[n].gap = 0; |
| n++; |
| |
| exit: |
| len = tipc_gap_ack_blks_sz(n); |
| ga->len = htons(len); |
| ga->gack_cnt = n; |
| return len; |
| } |
| |
| /* tipc_link_advance_transmq - advance TIPC link transmq queue by releasing |
| * acked packets, also doing retransmissions if |
| * gaps found |
| * @l: tipc link with transmq queue to be advanced |
| * @acked: seqno of last packet acked by peer without any gaps before |
| * @gap: # of gap packets |
| * @ga: buffer pointer to Gap ACK blocks from peer |
| * @xmitq: queue for accumulating the retransmitted packets if any |
| */ |
| static void tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap, |
| struct tipc_gap_ack_blks *ga, |
| struct sk_buff_head *xmitq) |
| { |
| struct sk_buff *skb, *_skb, *tmp; |
| struct tipc_msg *hdr; |
| u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
| u16 ack = l->rcv_nxt - 1; |
| u16 seqno; |
| u16 n = 0; |
| |
| skb_queue_walk_safe(&l->transmq, skb, tmp) { |
| seqno = buf_seqno(skb); |
| |
| next_gap_ack: |
| if (less_eq(seqno, acked)) { |
| /* release skb */ |
| __skb_unlink(skb, &l->transmq); |
| kfree_skb(skb); |
| } else if (less_eq(seqno, acked + gap)) { |
| /* retransmit skb */ |
| if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) |
| continue; |
| TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME; |
| |
| _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); |
| if (!_skb) |
| continue; |
| hdr = buf_msg(_skb); |
| msg_set_ack(hdr, ack); |
| msg_set_bcast_ack(hdr, bc_ack); |
| _skb->priority = TC_PRIO_CONTROL; |
| __skb_queue_tail(xmitq, _skb); |
| l->stats.retransmitted++; |
| } else { |
| /* retry with Gap ACK blocks if any */ |
| if (!ga || n >= ga->gack_cnt) |
| break; |
| acked = ntohs(ga->gacks[n].ack); |
| gap = ntohs(ga->gacks[n].gap); |
| n++; |
| goto next_gap_ack; |
| } |
| } |
| } |
| |
| /* tipc_link_build_state_msg: prepare link state message for transmission |
| * |
| * Note that sending of broadcast ack is coordinated among nodes, to reduce |
| * risk of ack storms towards the sender |
| */ |
| int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
| { |
| if (!l) |
| return 0; |
| |
| /* Broadcast ACK must be sent via a unicast link => defer to caller */ |
| if (link_is_bc_rcvlink(l)) { |
| if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
| return 0; |
| l->rcv_unacked = 0; |
| |
| /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ |
| l->snd_nxt = l->rcv_nxt; |
| return TIPC_LINK_SND_STATE; |
| } |
| |
| /* Unicast ACK */ |
| l->rcv_unacked = 0; |
| l->stats.sent_acks++; |
| tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
| return 0; |
| } |
| |
| /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
| */ |
| void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
| { |
| int mtyp = RESET_MSG; |
| struct sk_buff *skb; |
| |
| if (l->state == LINK_ESTABLISHING) |
| mtyp = ACTIVATE_MSG; |
| |
| tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); |
| |
| /* Inform peer that this endpoint is going down if applicable */ |
| skb = skb_peek_tail(xmitq); |
| if (skb && (l->state == LINK_RESET)) |
| msg_set_peer_stopping(buf_msg(skb), 1); |
| } |
| |
| /* tipc_link_build_nack_msg: prepare link nack message for transmission |
| * Note that sending of broadcast NACK is coordinated among nodes, to |
| * reduce the risk of NACK storms towards the sender |
| */ |
| static int tipc_link_build_nack_msg(struct tipc_link *l, |
| struct sk_buff_head *xmitq) |
| { |
| u32 def_cnt = ++l->stats.deferred_recv; |
| u32 defq_len = skb_queue_len(&l->deferdq); |
| int match1, match2; |
| |
| if (link_is_bc_rcvlink(l)) { |
| match1 = def_cnt & 0xf; |
| match2 = tipc_own_addr(l->net) & 0xf; |
| if (match1 == match2) |
| return TIPC_LINK_SND_STATE; |
| return 0; |
| } |
| |
| if (defq_len >= 3 && !((defq_len - 3) % 16)) |
| tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
| return 0; |
| } |
| |
| /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
| * @l: 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 *defq = &l->deferdq; |
| struct tipc_msg *hdr = buf_msg(skb); |
| u16 seqno, rcv_nxt, win_lim; |
| int rc = 0; |
| |
| /* Verify and update link state */ |
| if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
| return tipc_link_proto_rcv(l, skb, xmitq); |
| |
| /* Don't send probe at next timeout expiration */ |
| l->silent_intv_cnt = 0; |
| |
| do { |
| hdr = buf_msg(skb); |
| seqno = msg_seqno(hdr); |
| rcv_nxt = l->rcv_nxt; |
| win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
| |
| if (unlikely(!link_is_up(l))) { |
| if (l->state == LINK_ESTABLISHING) |
| rc = TIPC_LINK_UP_EVT; |
| goto drop; |
| } |
| |
| /* Drop if outside receive window */ |
| if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { |
| l->stats.duplicates++; |
| goto drop; |
| } |
| |
| /* Forward queues and wake up waiting users */ |
| if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { |
| l->stale_cnt = 0; |
| tipc_link_advance_backlog(l, xmitq); |
| if (unlikely(!skb_queue_empty(&l->wakeupq))) |
| link_prepare_wakeup(l); |
| } |
| |
| /* Defer delivery if sequence gap */ |
| if (unlikely(seqno != rcv_nxt)) { |
| __tipc_skb_queue_sorted(defq, seqno, skb); |
| rc |= tipc_link_build_nack_msg(l, xmitq); |
| break; |
| } |
| |
| /* Deliver packet */ |
| l->rcv_nxt++; |
| l->stats.recv_pkts++; |
| |
| if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL)) |
| rc |= tipc_link_tnl_rcv(l, skb, l->inputq); |
| else if (!tipc_data_input(l, skb, l->inputq)) |
| rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf); |
| if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
| rc |= tipc_link_build_state_msg(l, xmitq); |
| if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
| break; |
| } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt))); |
| |
| return rc; |
| drop: |
| kfree_skb(skb); |
| return rc; |
| } |
| |
| static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
| bool probe_reply, u16 rcvgap, |
| int tolerance, int priority, |
| struct sk_buff_head *xmitq) |
| { |
| struct tipc_link *bcl = l->bc_rcvlink; |
| struct sk_buff *skb; |
| struct tipc_msg *hdr; |
| struct sk_buff_head *dfq = &l->deferdq; |
| bool node_up = link_is_up(bcl); |
| struct tipc_mon_state *mstate = &l->mon_state; |
| int dlen = 0; |
| void *data; |
| u16 glen = 0; |
| |
| /* Don't send protocol message during reset or link failover */ |
| if (tipc_link_is_blocked(l)) |
| return; |
| |
| if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
| return; |
| |
| if (!skb_queue_empty(dfq)) |
| rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; |
| |
| skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, |
| tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ, |
| l->addr, tipc_own_addr(l->net), 0, 0, 0); |
| if (!skb) |
| return; |
| |
| hdr = buf_msg(skb); |
| data = msg_data(hdr); |
| msg_set_session(hdr, l->session); |
| msg_set_bearer_id(hdr, l->bearer_id); |
| msg_set_net_plane(hdr, l->net_plane); |
| msg_set_next_sent(hdr, l->snd_nxt); |
| msg_set_ack(hdr, l->rcv_nxt - 1); |
| msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
| msg_set_bc_ack_invalid(hdr, !node_up); |
| msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
| msg_set_link_tolerance(hdr, tolerance); |
| msg_set_linkprio(hdr, priority); |
| msg_set_redundant_link(hdr, node_up); |
| msg_set_seq_gap(hdr, 0); |
| msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
| |
| if (mtyp == STATE_MSG) { |
| if (l->peer_caps & TIPC_LINK_PROTO_SEQNO) |
| msg_set_seqno(hdr, l->snd_nxt_state++); |
| msg_set_seq_gap(hdr, rcvgap); |
| msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); |
| msg_set_probe(hdr, probe); |
| msg_set_is_keepalive(hdr, probe || probe_reply); |
| if (l->peer_caps & TIPC_GAP_ACK_BLOCK) |
| glen = tipc_build_gap_ack_blks(l, data); |
| tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id); |
| msg_set_size(hdr, INT_H_SIZE + glen + dlen); |
| skb_trim(skb, INT_H_SIZE + glen + dlen); |
| l->stats.sent_states++; |
| l->rcv_unacked = 0; |
| } else { |
| /* RESET_MSG or ACTIVATE_MSG */ |
| if (mtyp == ACTIVATE_MSG) { |
| msg_set_dest_session_valid(hdr, 1); |
| msg_set_dest_session(hdr, l->peer_session); |
| } |
| msg_set_max_pkt(hdr, l->advertised_mtu); |
| strcpy(data, l->if_name); |
| msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); |
| skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); |
| } |
| if (probe) |
| l->stats.sent_probes++; |
| if (rcvgap) |
| l->stats.sent_nacks++; |
| skb->priority = TC_PRIO_CONTROL; |
| __skb_queue_tail(xmitq, skb); |
| trace_tipc_proto_build(skb, false, l->name); |
| } |
| |
| void tipc_link_create_dummy_tnl_msg(struct tipc_link *l, |
| struct sk_buff_head *xmitq) |
| { |
| u32 onode = tipc_own_addr(l->net); |
| struct tipc_msg *hdr, *ihdr; |
| struct sk_buff_head tnlq; |
| struct sk_buff *skb; |
| u32 dnode = l->addr; |
| |
| skb_queue_head_init(&tnlq); |
| skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG, |
| INT_H_SIZE, BASIC_H_SIZE, |
| dnode, onode, 0, 0, 0); |
| if (!skb) { |
| pr_warn("%sunable to create tunnel packet\n", link_co_err); |
| return; |
| } |
| |
| hdr = buf_msg(skb); |
| msg_set_msgcnt(hdr, 1); |
| msg_set_bearer_id(hdr, l->peer_bearer_id); |
| |
| ihdr = (struct tipc_msg *)msg_data(hdr); |
| tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, |
| BASIC_H_SIZE, dnode); |
| msg_set_errcode(ihdr, TIPC_ERR_NO_PORT); |
| __skb_queue_tail(&tnlq, skb); |
| tipc_link_xmit(l, &tnlq, xmitq); |
| } |
| |
| /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
| * with contents of the link's transmit and backlog queues. |
| */ |
| void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
| int mtyp, struct sk_buff_head *xmitq) |
| { |
| struct sk_buff_head *fdefq = &tnl->failover_deferdq; |
| 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; |
| |
| if (!tnl) |
| return; |
| |
| skb_queue_head_init(&tnlq); |
| skb_queue_head_init(&tmpxq); |
| |
| /* 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, tipc_own_addr(l->net), |
| 0, 0, TIPC_ERR_NO_PORT); |
| if (!skb) { |
| pr_warn("%sunable to create tunnel packet\n", link_co_err); |
| return; |
| } |
| skb_queue_tail(&tnlq, skb); |
| tipc_link_xmit(l, &tnlq, &tmpxq); |
| __skb_queue_purge(&tmpxq); |
| |
| /* Initialize reusable tunnel packet header */ |
| tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
| mtyp, INT_H_SIZE, l->addr); |
| if (mtyp == SYNCH_MSG) |
| pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq)); |
| else |
| pktcnt = skb_queue_len(&l->transmq); |
| pktcnt += 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) { |
| 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, GFP_ATOMIC); |
| if (!tnlskb) { |
| pr_warn("%sunable to send packet\n", link_co_err); |
| 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 != &l->backlogq) { |
| queue = &l->backlogq; |
| goto tnl; |
| } |
| |
| tipc_link_xmit(tnl, &tnlq, xmitq); |
| |
| if (mtyp == FAILOVER_MSG) { |
| tnl->drop_point = l->rcv_nxt; |
| tnl->failover_reasm_skb = l->reasm_buf; |
| l->reasm_buf = NULL; |
| |
| /* Failover the link's deferdq */ |
| if (unlikely(!skb_queue_empty(fdefq))) { |
| pr_warn("Link failover deferdq not empty: %d!\n", |
| skb_queue_len(fdefq)); |
| __skb_queue_purge(fdefq); |
| } |
| skb_queue_splice_init(&l->deferdq, fdefq); |
| } |
| } |
| |
| /** |
| * tipc_link_failover_prepare() - prepare tnl for link failover |
| * |
| * This is a special version of the precursor - tipc_link_tnl_prepare(), |
| * see the tipc_node_link_failover() for details |
| * |
| * @l: failover link |
| * @tnl: tunnel link |
| * @xmitq: queue for messages to be xmited |
| */ |
| void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl, |
| struct sk_buff_head *xmitq) |
| { |
| struct sk_buff_head *fdefq = &tnl->failover_deferdq; |
| |
| tipc_link_create_dummy_tnl_msg(tnl, xmitq); |
| |
| /* This failover link enpoint was never established before, |
| * so it has not received anything from peer. |
| * Otherwise, it must be a normal failover situation or the |
| * node has entered SELF_DOWN_PEER_LEAVING and both peer nodes |
| * would have to start over from scratch instead. |
| */ |
| WARN_ON(l && tipc_link_is_up(l)); |
| tnl->drop_point = 1; |
| tnl->failover_reasm_skb = NULL; |
| |
| /* Initiate the link's failover deferdq */ |
| if (unlikely(!skb_queue_empty(fdefq))) { |
| pr_warn("Link failover deferdq not empty: %d!\n", |
| skb_queue_len(fdefq)); |
| __skb_queue_purge(fdefq); |
| } |
| } |
| |
| /* tipc_link_validate_msg(): validate message against current link state |
| * Returns true if message should be accepted, otherwise false |
| */ |
| bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr) |
| { |
| u16 curr_session = l->peer_session; |
| u16 session = msg_session(hdr); |
| int mtyp = msg_type(hdr); |
| |
| if (msg_user(hdr) != LINK_PROTOCOL) |
| return true; |
| |
| switch (mtyp) { |
| case RESET_MSG: |
| if (!l->in_session) |
| return true; |
| /* Accept only RESET with new session number */ |
| return more(session, curr_session); |
| case ACTIVATE_MSG: |
| if (!l->in_session) |
| return true; |
| /* Accept only ACTIVATE with new or current session number */ |
| return !less(session, curr_session); |
| case STATE_MSG: |
| /* Accept only STATE with current session number */ |
| if (!l->in_session) |
| return false; |
| if (session != curr_session) |
| return false; |
| /* Extra sanity check */ |
| if (!link_is_up(l) && msg_ack(hdr)) |
| return false; |
| if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO)) |
| return true; |
| /* Accept only STATE with new sequence number */ |
| return !less(msg_seqno(hdr), l->rcv_nxt_state); |
| default: |
| return false; |
| } |
| } |
| |
| /* 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); |
| struct tipc_gap_ack_blks *ga = NULL; |
| u16 rcvgap = 0; |
| u16 ack = msg_ack(hdr); |
| u16 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); |
| u16 rcv_nxt = l->rcv_nxt; |
| u16 dlen = msg_data_sz(hdr); |
| int mtyp = msg_type(hdr); |
| bool reply = msg_probe(hdr); |
| u16 glen = 0; |
| void *data; |
| char *if_name; |
| int rc = 0; |
| |
| trace_tipc_proto_rcv(skb, false, l->name); |
| if (tipc_link_is_blocked(l) || !xmitq) |
| goto exit; |
| |
| if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
| l->net_plane = msg_net_plane(hdr); |
| |
| skb_linearize(skb); |
| hdr = buf_msg(skb); |
| data = msg_data(hdr); |
| |
| if (!tipc_link_validate_msg(l, hdr)) { |
| trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!"); |
| trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!"); |
| goto exit; |
| } |
| |
| switch (mtyp) { |
| case RESET_MSG: |
| 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, data, 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; |
| l->bc_rcvlink->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; |
| |
| /* If peer is going down we want full re-establish cycle */ |
| if (msg_peer_stopping(hdr)) { |
| rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
| break; |
| } |
| |
| /* If this endpoint was re-created while peer was ESTABLISHING |
| * it doesn't know current session number. Force re-synch. |
| */ |
| if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) && |
| l->session != msg_dest_session(hdr)) { |
| if (less(l->session, msg_dest_session(hdr))) |
| l->session = msg_dest_session(hdr) + 1; |
| break; |
| } |
| |
| /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
| if (mtyp == RESET_MSG || !link_is_up(l)) |
| rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
| |
| /* ACTIVATE_MSG takes up link if it was already locally reset */ |
| if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING) |
| rc = TIPC_LINK_UP_EVT; |
| |
| l->peer_session = msg_session(hdr); |
| l->in_session = true; |
| l->peer_bearer_id = msg_bearer_id(hdr); |
| if (l->mtu > msg_max_pkt(hdr)) |
| l->mtu = msg_max_pkt(hdr); |
| break; |
| |
| case STATE_MSG: |
| l->rcv_nxt_state = msg_seqno(hdr) + 1; |
| |
| /* 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->bc_rcvlink->tolerance = peers_tol; |
| } |
| /* Update own prio if peer indicates a different value */ |
| if ((peers_prio != l->priority) && |
| in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { |
| l->priority = peers_prio; |
| rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
| } |
| |
| l->silent_intv_cnt = 0; |
| l->stats.recv_states++; |
| if (msg_probe(hdr)) |
| l->stats.recv_probes++; |
| |
| if (!link_is_up(l)) { |
| if (l->state == LINK_ESTABLISHING) |
| rc = TIPC_LINK_UP_EVT; |
| break; |
| } |
| |
| /* Receive Gap ACK blocks from peer if any */ |
| if (l->peer_caps & TIPC_GAP_ACK_BLOCK) { |
| ga = (struct tipc_gap_ack_blks *)data; |
| glen = ntohs(ga->len); |
| /* sanity check: if failed, ignore Gap ACK blocks */ |
| if (glen != tipc_gap_ack_blks_sz(ga->gack_cnt)) |
| ga = NULL; |
| } |
| |
| tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr, |
| &l->mon_state, l->bearer_id); |
| |
| /* 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 || reply) |
| tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, |
| rcvgap, 0, 0, xmitq); |
| |
| tipc_link_advance_transmq(l, ack, gap, ga, xmitq); |
| |
| /* If NACK, retransmit will now start at right position */ |
| if (gap) |
| 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; |
| } |
| |
| /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
| */ |
| static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, |
| u16 peers_snd_nxt, |
| struct sk_buff_head *xmitq) |
| { |
| struct sk_buff *skb; |
| struct tipc_msg *hdr; |
| struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); |
| u16 ack = l->rcv_nxt - 1; |
| u16 gap_to = peers_snd_nxt - 1; |
| |
| skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, |
| 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
| if (!skb) |
| return false; |
| hdr = buf_msg(skb); |
| msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
| msg_set_bcast_ack(hdr, ack); |
| msg_set_bcgap_after(hdr, ack); |
| if (dfrd_skb) |
| gap_to = buf_seqno(dfrd_skb) - 1; |
| msg_set_bcgap_to(hdr, gap_to); |
| msg_set_non_seq(hdr, bcast); |
| __skb_queue_tail(xmitq, skb); |
| return true; |
| } |
| |
| /* tipc_link_build_bc_init_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_bc_init_msg(struct tipc_link *l, |
| struct sk_buff_head *xmitq) |
| { |
| struct sk_buff_head list; |
| |
| __skb_queue_head_init(&list); |
| if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) |
| return; |
| msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); |
| tipc_link_xmit(l, &list, xmitq); |
| } |
| |
| /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer |
| */ |
| void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) |
| { |
| int mtyp = msg_type(hdr); |
| u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
| |
| if (link_is_up(l)) |
| return; |
| |
| if (msg_user(hdr) == BCAST_PROTOCOL) { |
| l->rcv_nxt = peers_snd_nxt; |
| l->state = LINK_ESTABLISHED; |
| return; |
| } |
| |
| if (l->peer_caps & TIPC_BCAST_SYNCH) |
| return; |
| |
| if (msg_peer_node_is_up(hdr)) |
| return; |
| |
| /* Compatibility: accept older, less safe initial synch data */ |
| if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) |
| l->rcv_nxt = peers_snd_nxt; |
| } |
| |
| /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state |
| */ |
| int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
| struct sk_buff_head *xmitq) |
| { |
| struct tipc_link *snd_l = l->bc_sndlink; |
| u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
| u16 from = msg_bcast_ack(hdr) + 1; |
| u16 to = from + msg_bc_gap(hdr) - 1; |
| int rc = 0; |
| |
| if (!link_is_up(l)) |
| return rc; |
| |
| if (!msg_peer_node_is_up(hdr)) |
| return rc; |
| |
| /* Open when peer ackowledges our bcast init msg (pkt #1) */ |
| if (msg_ack(hdr)) |
| l->bc_peer_is_up = true; |
| |
| if (!l->bc_peer_is_up) |
| return rc; |
| |
| l->stats.recv_nacks++; |
| |
| /* Ignore if peers_snd_nxt goes beyond receive window */ |
| if (more(peers_snd_nxt, l->rcv_nxt + l->window)) |
| return rc; |
| |
| rc = tipc_link_retrans(snd_l, l, from, to, xmitq); |
| |
| l->snd_nxt = peers_snd_nxt; |
| if (link_bc_rcv_gap(l)) |
| rc |= TIPC_LINK_SND_STATE; |
| |
| /* Return now if sender supports nack via STATE messages */ |
| if (l->peer_caps & TIPC_BCAST_STATE_NACK) |
| return rc; |
| |
| /* Otherwise, be backwards compatible */ |
| |
| if (!more(peers_snd_nxt, l->rcv_nxt)) { |
| l->nack_state = BC_NACK_SND_CONDITIONAL; |
| return 0; |
| } |
| |
| /* Don't NACK if one was recently sent or peeked */ |
| if (l->nack_state == BC_NACK_SND_SUPPRESS) { |
| l->nack_state = BC_NACK_SND_UNCONDITIONAL; |
| return 0; |
| } |
| |
| /* Conditionally delay NACK sending until next synch rcv */ |
| if (l->nack_state == BC_NACK_SND_CONDITIONAL) { |
| l->nack_state = BC_NACK_SND_UNCONDITIONAL; |
| if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) |
| return 0; |
| } |
| |
| /* Send NACK now but suppress next one */ |
| tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); |
| l->nack_state = BC_NACK_SND_SUPPRESS; |
| return 0; |
| } |
| |
| void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, |
| struct sk_buff_head *xmitq) |
| { |
| struct sk_buff *skb, *tmp; |
| struct tipc_link *snd_l = l->bc_sndlink; |
| |
| if (!link_is_up(l) || !l->bc_peer_is_up) |
| return; |
| |
| if (!more(acked, l->acked)) |
| return; |
| |
| trace_tipc_link_bc_ack(l, l->acked, acked, &snd_l->transmq); |
| /* Skip over packets peer has already acked */ |
| skb_queue_walk(&snd_l->transmq, skb) { |
| if (more(buf_seqno(skb), l->acked)) |
| break; |
| } |
| |
| /* Update/release the packets peer is acking now */ |
| skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { |
| if (more(buf_seqno(skb), acked)) |
| break; |
| if (!--TIPC_SKB_CB(skb)->ackers) { |
| __skb_unlink(skb, &snd_l->transmq); |
| kfree_skb(skb); |
| } |
| } |
| l->acked = acked; |
| tipc_link_advance_backlog(snd_l, xmitq); |
| if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) |
| link_prepare_wakeup(snd_l); |
| } |
| |
| /* tipc_link_bc_nack_rcv(): receive broadcast nack message |
| * This function is here for backwards compatibility, since |
| * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. |
| */ |
| int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, |
| struct sk_buff_head *xmitq) |
| { |
| struct tipc_msg *hdr = buf_msg(skb); |
| u32 dnode = msg_destnode(hdr); |
| int mtyp = msg_type(hdr); |
| u16 acked = msg_bcast_ack(hdr); |
| u16 from = acked + 1; |
| u16 to = msg_bcgap_to(hdr); |
| u16 peers_snd_nxt = to + 1; |
| int rc = 0; |
| |
| kfree_skb(skb); |
| |
| if (!tipc_link_is_up(l) || !l->bc_peer_is_up) |
| return 0; |
| |
| if (mtyp != STATE_MSG) |
| return 0; |
| |
| if (dnode == tipc_own_addr(l->net)) { |
| tipc_link_bc_ack_rcv(l, acked, xmitq); |
| rc = tipc_link_retrans(l->bc_sndlink, l, from, to, xmitq); |
| l->stats.recv_nacks++; |
| return rc; |
| } |
| |
| /* Msg for other node => suppress own NACK at next sync if applicable */ |
| if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) |
| l->nack_state = BC_NACK_SND_SUPPRESS; |
| |
| return 0; |
| } |
| |
| void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
| { |
| int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE); |
| |
| l->window = win; |
| l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win); |
| l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2); |
| l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3); |
| l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4); |
| l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
| } |
| |
| /** |
| * link_reset_stats - reset link statistics |
| * @l: pointer to link |
| */ |
| void tipc_link_reset_stats(struct tipc_link *l) |
| { |
| memset(&l->stats, 0, sizeof(l->stats)); |
| } |
| |
| static void link_print(struct tipc_link *l, const char *str) |
| { |
| struct sk_buff *hskb = skb_peek(&l->transmq); |
| u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
| u16 tail = l->snd_nxt - 1; |
| |
| 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); |
| } |
| |
| /* Parse and validate nested (link) properties valid for media, bearer and link |
| */ |
| int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) |
| { |
| int err; |
| |
| err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop, |
| tipc_nl_prop_policy, NULL); |
| if (err) |
| return err; |
| |
| if (props[TIPC_NLA_PROP_PRIO]) { |
| u32 prio; |
| |
| prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| if (prio > TIPC_MAX_LINK_PRI) |
| return -EINVAL; |
| } |
| |
| if (props[TIPC_NLA_PROP_TOL]) { |
| u32 tol; |
| |
| tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); |
| if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) |
| return -EINVAL; |
| } |
| |
| if (props[TIPC_NLA_PROP_WIN]) { |
| u32 win; |
| |
| win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
| { |
| int i; |
| struct nlattr *stats; |
| |
| struct nla_map { |
| u32 key; |
| u32 val; |
| }; |
| |
| struct nla_map map[] = { |
| {TIPC_NLA_STATS_RX_INFO, 0}, |
| {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
| {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, |
| {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, |
| {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, |
| {TIPC_NLA_STATS_TX_INFO, 0}, |
| {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
| {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, |
| {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, |
| {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, |
| {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? |
| s->msg_length_counts : 1}, |
| {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, |
| {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, |
| {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, |
| {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, |
| {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, |
| {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, |
| {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, |
| {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, |
| {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, |
| {TIPC_NLA_STATS_RX_STATES, s->recv_states}, |
| {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, |
| {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, |
| {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, |
| {TIPC_NLA_STATS_TX_STATES, s->sent_states}, |
| {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, |
| {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, |
| {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, |
| {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, |
| {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, |
| {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, |
| {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, |
| {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? |
| (s->accu_queue_sz / s->queue_sz_counts) : 0} |
| }; |
| |
| stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
| if (!stats) |
| return -EMSGSIZE; |
| |
| for (i = 0; i < ARRAY_SIZE(map); i++) |
| if (nla_put_u32(skb, map[i].key, map[i].val)) |
| goto msg_full; |
| |
| nla_nest_end(skb, stats); |
| |
| return 0; |
| msg_full: |
| nla_nest_cancel(skb, stats); |
| |
| return -EMSGSIZE; |
| } |
| |
| /* Caller should hold appropriate locks to protect the link */ |
| int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
| struct tipc_link *link, int nlflags) |
| { |
| u32 self = tipc_own_addr(net); |
| struct nlattr *attrs; |
| struct nlattr *prop; |
| void *hdr; |
| int err; |
| |
| hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| nlflags, TIPC_NL_LINK_GET); |
| if (!hdr) |
| return -EMSGSIZE; |
| |
| attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
| if (!attrs) |
| goto msg_full; |
| |
| if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) |
| goto attr_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self))) |
| goto attr_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
| goto attr_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) |
| goto attr_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) |
| goto attr_msg_full; |
| |
| if (tipc_link_is_up(link)) |
| if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) |
| goto attr_msg_full; |
| if (link->active) |
| if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
| goto attr_msg_full; |
| |
| prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
| if (!prop) |
| goto attr_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, |
| link->window)) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) |
| goto prop_msg_full; |
| nla_nest_end(msg->skb, prop); |
| |
| err = __tipc_nl_add_stats(msg->skb, &link->stats); |
| if (err) |
| goto attr_msg_full; |
| |
| nla_nest_end(msg->skb, attrs); |
| genlmsg_end(msg->skb, hdr); |
| |
| return 0; |
| |
| prop_msg_full: |
| nla_nest_cancel(msg->skb, prop); |
| attr_msg_full: |
| nla_nest_cancel(msg->skb, attrs); |
| msg_full: |
| genlmsg_cancel(msg->skb, hdr); |
| |
| return -EMSGSIZE; |
| } |
| |
| static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, |
| struct tipc_stats *stats) |
| { |
| int i; |
| struct nlattr *nest; |
| |
| struct nla_map { |
| __u32 key; |
| __u32 val; |
| }; |
| |
| struct nla_map map[] = { |
| {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, |
| {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
| {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, |
| {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, |
| {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, |
| {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, |
| {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
| {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, |
| {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, |
| {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, |
| {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, |
| {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, |
| {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, |
| {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, |
| {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, |
| {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, |
| {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, |
| {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, |
| {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? |
| (stats->accu_queue_sz / stats->queue_sz_counts) : 0} |
| }; |
| |
| nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
| if (!nest) |
| return -EMSGSIZE; |
| |
| for (i = 0; i < ARRAY_SIZE(map); i++) |
| if (nla_put_u32(skb, map[i].key, map[i].val)) |
| goto msg_full; |
| |
| nla_nest_end(skb, nest); |
| |
| return 0; |
| msg_full: |
| nla_nest_cancel(skb, nest); |
| |
| return -EMSGSIZE; |
| } |
| |
| int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) |
| { |
| int err; |
| void *hdr; |
| struct nlattr *attrs; |
| struct nlattr *prop; |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| u32 bc_mode = tipc_bcast_get_broadcast_mode(net); |
| u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net); |
| struct tipc_link *bcl = tn->bcl; |
| |
| if (!bcl) |
| return 0; |
| |
| tipc_bcast_lock(net); |
| |
| hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| NLM_F_MULTI, TIPC_NL_LINK_GET); |
| if (!hdr) { |
| tipc_bcast_unlock(net); |
| return -EMSGSIZE; |
| } |
| |
| attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
| if (!attrs) |
| goto msg_full; |
| |
| /* The broadcast link is always up */ |
| if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) |
| goto attr_msg_full; |
| |
| if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) |
| goto attr_msg_full; |
| if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) |
| goto attr_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) |
| goto attr_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) |
| goto attr_msg_full; |
| |
| prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
| if (!prop) |
| goto attr_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode)) |
| goto prop_msg_full; |
| if (bc_mode & BCLINK_MODE_SEL) |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO, |
| bc_ratio)) |
| goto prop_msg_full; |
| nla_nest_end(msg->skb, prop); |
| |
| err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); |
| if (err) |
| goto attr_msg_full; |
| |
| tipc_bcast_unlock(net); |
| nla_nest_end(msg->skb, attrs); |
| genlmsg_end(msg->skb, hdr); |
| |
| return 0; |
| |
| prop_msg_full: |
| nla_nest_cancel(msg->skb, prop); |
| attr_msg_full: |
| nla_nest_cancel(msg->skb, attrs); |
| msg_full: |
| tipc_bcast_unlock(net); |
| genlmsg_cancel(msg->skb, hdr); |
| |
| return -EMSGSIZE; |
| } |
| |
| void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
| struct sk_buff_head *xmitq) |
| { |
| l->tolerance = tol; |
| if (l->bc_rcvlink) |
| l->bc_rcvlink->tolerance = tol; |
| if (link_is_up(l)) |
| tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); |
| } |
| |
| void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
| struct sk_buff_head *xmitq) |
| { |
| l->priority = prio; |
| tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); |
| } |
| |
| void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) |
| { |
| l->abort_limit = limit; |
| } |
| |
| char *tipc_link_name_ext(struct tipc_link *l, char *buf) |
| { |
| if (!l) |
| scnprintf(buf, TIPC_MAX_LINK_NAME, "null"); |
| else if (link_is_bc_sndlink(l)) |
| scnprintf(buf, TIPC_MAX_LINK_NAME, "broadcast-sender"); |
| else if (link_is_bc_rcvlink(l)) |
| scnprintf(buf, TIPC_MAX_LINK_NAME, |
| "broadcast-receiver, peer %x", l->addr); |
| else |
| memcpy(buf, l->name, TIPC_MAX_LINK_NAME); |
| |
| return buf; |
| } |
| |
| /** |
| * tipc_link_dump - dump TIPC link data |
| * @l: tipc link to be dumped |
| * @dqueues: bitmask to decide if any link queue to be dumped? |
| * - TIPC_DUMP_NONE: don't dump link queues |
| * - TIPC_DUMP_TRANSMQ: dump link transmq queue |
| * - TIPC_DUMP_BACKLOGQ: dump link backlog queue |
| * - TIPC_DUMP_DEFERDQ: dump link deferd queue |
| * - TIPC_DUMP_INPUTQ: dump link input queue |
| * - TIPC_DUMP_WAKEUP: dump link wakeup queue |
| * - TIPC_DUMP_ALL: dump all the link queues above |
| * @buf: returned buffer of dump data in format |
| */ |
| int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf) |
| { |
| int i = 0; |
| size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN; |
| struct sk_buff_head *list; |
| struct sk_buff *hskb, *tskb; |
| u32 len; |
| |
| if (!l) { |
| i += scnprintf(buf, sz, "link data: (null)\n"); |
| return i; |
| } |
| |
| i += scnprintf(buf, sz, "link data: %x", l->addr); |
| i += scnprintf(buf + i, sz - i, " %x", l->state); |
| i += scnprintf(buf + i, sz - i, " %u", l->in_session); |
| i += scnprintf(buf + i, sz - i, " %u", l->session); |
| i += scnprintf(buf + i, sz - i, " %u", l->peer_session); |
| i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt); |
| i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt); |
| i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state); |
| i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state); |
| i += scnprintf(buf + i, sz - i, " %x", l->peer_caps); |
| i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt); |
| i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt); |
| i += scnprintf(buf + i, sz - i, " %u", l->prev_from); |
| i += scnprintf(buf + i, sz - i, " %u", l->stale_cnt); |
| i += scnprintf(buf + i, sz - i, " %u", l->acked); |
| |
| list = &l->transmq; |
| len = skb_queue_len(list); |
| hskb = skb_peek(list); |
| tskb = skb_peek_tail(list); |
| i += scnprintf(buf + i, sz - i, " | %u %u %u", len, |
| (hskb) ? msg_seqno(buf_msg(hskb)) : 0, |
| (tskb) ? msg_seqno(buf_msg(tskb)) : 0); |
| |
| list = &l->deferdq; |
| len = skb_queue_len(list); |
| hskb = skb_peek(list); |
| tskb = skb_peek_tail(list); |
| i += scnprintf(buf + i, sz - i, " | %u %u %u", len, |
| (hskb) ? msg_seqno(buf_msg(hskb)) : 0, |
| (tskb) ? msg_seqno(buf_msg(tskb)) : 0); |
| |
| list = &l->backlogq; |
| len = skb_queue_len(list); |
| hskb = skb_peek(list); |
| tskb = skb_peek_tail(list); |
| i += scnprintf(buf + i, sz - i, " | %u %u %u", len, |
| (hskb) ? msg_seqno(buf_msg(hskb)) : 0, |
| (tskb) ? msg_seqno(buf_msg(tskb)) : 0); |
| |
| list = l->inputq; |
| len = skb_queue_len(list); |
| hskb = skb_peek(list); |
| tskb = skb_peek_tail(list); |
| i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len, |
| (hskb) ? msg_seqno(buf_msg(hskb)) : 0, |
| (tskb) ? msg_seqno(buf_msg(tskb)) : 0); |
| |
| if (dqueues & TIPC_DUMP_TRANSMQ) { |
| i += scnprintf(buf + i, sz - i, "transmq: "); |
| i += tipc_list_dump(&l->transmq, false, buf + i); |
| } |
| if (dqueues & TIPC_DUMP_BACKLOGQ) { |
| i += scnprintf(buf + i, sz - i, |
| "backlogq: <%u %u %u %u %u>, ", |
| l->backlog[TIPC_LOW_IMPORTANCE].len, |
| l->backlog[TIPC_MEDIUM_IMPORTANCE].len, |
| l->backlog[TIPC_HIGH_IMPORTANCE].len, |
| l->backlog[TIPC_CRITICAL_IMPORTANCE].len, |
| l->backlog[TIPC_SYSTEM_IMPORTANCE].len); |
| i += tipc_list_dump(&l->backlogq, false, buf + i); |
| } |
| if (dqueues & TIPC_DUMP_DEFERDQ) { |
| i += scnprintf(buf + i, sz - i, "deferdq: "); |
| i += tipc_list_dump(&l->deferdq, false, buf + i); |
| } |
| if (dqueues & TIPC_DUMP_INPUTQ) { |
| i += scnprintf(buf + i, sz - i, "inputq: "); |
| i += tipc_list_dump(l->inputq, false, buf + i); |
| } |
| if (dqueues & TIPC_DUMP_WAKEUP) { |
| i += scnprintf(buf + i, sz - i, "wakeup: "); |
| i += tipc_list_dump(&l->wakeupq, false, buf + i); |
| } |
| |
| return i; |
| } |