/net/tipc/link.c
C | 2855 lines | 2148 code | 312 blank | 395 comment | 376 complexity | 8e20a8e3c1b08ee70c2acc96714a19f1 MD5 | raw file
Possible License(s): AGPL-1.0, GPL-2.0, LGPL-2.0
- /*
- * 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 "crypto.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
- * @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;
- struct sk_buff *target_bskb;
- } backlog[5];
- u16 snd_nxt;
- /* 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;
- u16 window;
- u16 min_win;
- u16 ssthresh;
- u16 max_win;
- u16 cong_acks;
- u16 checkpoint;
- /* Fragmentation/reassembly */
- struct sk_buff *reasm_buf;
- struct sk_buff *reasm_tnlmsg;
- /* 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 (jiffies + msecs_to_jiffies(10))
- #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 int tipc_link_release_pkts(struct tipc_link *l, u16 to);
- static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data, u16 gap);
- static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
- struct tipc_gap_ack_blks *ga,
- struct sk_buff_head *xmitq);
- static void tipc_link_update_cwin(struct tipc_link *l, int released,
- bool retransmitted);
- /*
- * 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_min_win(struct tipc_link *l)
- {
- return l->min_win;
- }
- int tipc_link_max_win(struct tipc_link *l)
- {
- return l->max_win;
- }
- 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;
- }
- int tipc_link_mss(struct tipc_link *l)
- {
- #ifdef CONFIG_TIPC_CRYPTO
- return l->mtu - INT_H_SIZE - EMSG_OVERHEAD;
- #else
- return l->mtu - INT_H_SIZE;
- #endif
- }
- 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
- * @min_win: minimal send window to be used by link
- * @max_win: maximal 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,
- u32 min_win, u32 max_win, 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, min_win, max_win);
- 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, u32 min_win, u32 max_win, 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, min_win,
- max_win, 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_toggle_rcast(net, false);
- 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_inner_hdr(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);
- }
- static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r,
- u16 from, u16 to, struct sk_buff_head *xmitq);
- /* 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++;
- if (l->snd_nxt == l->checkpoint) {
- tipc_link_update_cwin(l, 0, 0);
- probe = true;
- }
- l->checkpoint = l->snd_nxt;
- 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_head *wakeupq = &l->wakeupq;
- struct sk_buff_head *inputq = l->inputq;
- struct sk_buff *skb, *tmp;
- struct sk_buff_head tmpq;
- int avail[5] = {0,};
- int imp = 0;
- __skb_queue_head_init(&tmpq);
- for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++)
- avail[imp] = l->backlog[imp].limit - l->backlog[imp].len;
- skb_queue_walk_safe(wakeupq, skb, tmp) {
- imp = TIPC_SKB_CB(skb)->chain_imp;
- if (avail[imp] <= 0)
- continue;
- avail[imp]--;
- __skb_unlink(skb, wakeupq);
- __skb_queue_tail(&tmpq, skb);
- }
- spin_lock_bh(&inputq->lock);
- skb_queue_splice_tail(&tmpq, inputq);
- spin_unlock_bh(&inputq->lock);
- }
- void tipc_link_reset(struct tipc_link *l)
- {
- struct sk_buff_head list;
- u32 imp;
- __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);
- for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) {
- l->backlog[imp].len = 0;
- l->backlog[imp].target_bskb = NULL;
- }
- kfree_skb(l->reasm_buf);
- kfree_skb(l->reasm_tnlmsg);
- kfree_skb(l->failover_reasm_skb);
- l->reasm_buf = NULL;
- l->reasm_tnlmsg = 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->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));
- struct sk_buff_head *backlogq = &l->backlogq;
- struct sk_buff_head *transmq = &l->transmq;
- struct sk_buff *skb, *_skb;
- u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
- u16 ack = l->rcv_nxt - 1;
- u16 seqno = l->snd_nxt;
- int pkt_cnt = skb_queue_len(list);
- int imp = msg_importance(hdr);
- unsigned int mss = tipc_link_mss(l);
- unsigned int cwin = l->window;
- unsigned int mtu = l->mtu;
- bool new_bundle;
- int rc = 0;
- if (unlikely(msg_size(hdr) > mtu)) {
- pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n",
- skb_queue_len(list), msg_user(hdr),
- msg_type(hdr), 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 = __skb_dequeue(list))) {
- if (likely(skb_queue_len(transmq) < cwin)) {
- hdr = buf_msg(skb);
- msg_set_seqno(hdr, seqno);
- msg_set_ack(hdr, ack);
- msg_set_bcast_ack(hdr, bc_ack);
- _skb = skb_clone(skb, GFP_ATOMIC);
- if (!_skb) {
- kfree_skb(skb);
- __skb_queue_purge(list);
- return -ENOBUFS;
- }
- __skb_queue_tail(transmq, skb);
- /* next retransmit attempt */
- if (link_is_bc_sndlink(l))
- TIPC_SKB_CB(skb)->nxt_retr = 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_try_bundle(l->backlog[imp].target_bskb, &skb,
- mss, l->addr, &new_bundle)) {
- if (skb) {
- /* Keep a ref. to the skb for next try */
- l->backlog[imp].target_bskb = skb;
- l->backlog[imp].len++;
- __skb_queue_tail(backlogq, skb);
- } else {
- if (new_bundle) {
- l->stats.sent_bundles++;
- l->stats.sent_bundled++;
- }
- l->stats.sent_bundled++;
- }
- continue;
- }
- l->backlog[imp].target_bskb = NULL;
- l->backlog[imp].len += (1 + skb_queue_len(list));
- __skb_queue_tail(backlogq, skb);
- skb_queue_splice_tail_init(list, backlogq);
- }
- l->snd_nxt = seqno;
- return rc;
- }
- static void tipc_link_update_cwin(struct tipc_link *l, int released,
- bool retransmitted)
- {
- int bklog_len = skb_queue_len(&l->backlogq);
- struct sk_buff_head *txq = &l->transmq;
- int txq_len = skb_queue_len(txq);
- u16 cwin = l->window;
- /* Enter fast recovery */
- if (unlikely(retransmitted)) {
- l->ssthresh = max_t(u16, l->window / 2, 300);
- l->window = min_t(u16, l->ssthresh, l->window);
- return;
- }
- /* Enter slow start */
- if (unlikely(!released)) {
- l->ssthresh = max_t(u16, l->window / 2, 300);
- l->window = l->min_win;
- return;
- }
- /* Don't increase window if no pressure on the transmit queue */
- if (txq_len + bklog_len < cwin)
- return;
- /* Don't increase window if there are holes the transmit queue */
- if (txq_len && l->snd_nxt - buf_seqno(skb_peek(txq)) != txq_len)
- return;
- l->cong_acks += released;
- /* Slow start */
- if (cwin <= l->ssthresh) {
- l->window = min_t(u16, cwin + released, l->max_win);
- return;
- }
- /* Congestion avoidance */
- if (l->cong_acks < cwin)
- return;
- l->window = min_t(u16, ++cwin, l->max_win);
- l->cong_acks = 0;
- }
- static void tipc_link_advance_backlog(struct tipc_link *l,
- struct sk_buff_head *xmitq)
- {
- u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
- struct sk_buff_head *txq = &l->transmq;
- struct sk_buff *skb, *_skb;
- u16 ack = l->rcv_nxt - 1;
- u16 seqno = l->snd_nxt;
- struct tipc_msg *hdr;
- u16 cwin = l->window;
- u32 imp;
- while (skb_queue_len(txq) < cwin) {
- 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);
- imp = msg_importance(hdr);
- l->backlog[imp].len--;
- if (unlikely(skb == l->backlog[imp].target_bskb))
- l->backlog[imp].target_bskb = NULL;
- __skb_queue_tail(&l->transmq, skb);
- /* next retransmit attempt */
- if (link_is_bc_sndlink(l))
- TIPC_SKB_CB(skb)->nxt_retr = 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;
- }
- /**
- * link_retransmit_failure() - Detect repeated retransmit failures
- * @l: tipc link sender
- * @r: tipc link receiver (= l in case of unicast)
- * @rc: returned code
- *
- * Return: true if the repeated retransmit failures happens, otherwise
- * false
- */
- static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r,
- int *rc)
- {
- struct sk_buff *skb = skb_peek(&l->transmq);
- struct tipc_msg *hdr;
- if (!skb)
- return false;
- if (!TIPC_SKB_CB(skb)->retr_cnt)
- return false;
- if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp +
- msecs_to_jiffies(r->tolerance * 10)))
- return false;
- hdr = buf_msg(skb);
- if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr)))
- return false;
- 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, dest: %x\n",
- msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr));
- pr_info("retr_stamp %d, retr_cnt %d\n",
- jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp),
- TIPC_SKB_CB(skb)->retr_cnt);
- 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)) {
- r->state = LINK_RESET;
- *rc = TIPC_LINK_DOWN_EVT;
- } else {
- *rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
- }
- return true;
- }
- /* tipc_link_bc_retrans() - retransmit zero 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_bc_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;
- int retransmitted = 0;
- struct tipc_msg *hdr;
- int rc = 0;
- if (!skb)
- return 0;
- if (less(to, from))
- return 0;
- trace_tipc_link_retrans(r, from, to, &l->transmq);
- if (link_retransmit_failure(l, r, &rc))
- return rc;
- 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 (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
- continue;
- TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
- _skb = pskb_copy(skb, 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++;
- retransmitted++;
- /* Increase actual retrans counter & mark first time */
- if (!TIPC_SKB_CB(skb)->retr_cnt++)
- TIPC_SKB_CB(skb)->retr_stamp = jiffies;
- }
- tipc_link_update_cwin(l, 0, 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 **reasm_tnlmsg = &l->reasm_tnlmsg;
- 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;
- if (msg_type(hdr) == SYNCH_MSG) {
- kfree_skb(skb);
- return 0;
- }
- /* Not a fragment? */
- if (likely(!msg_nof_fragms(hdr))) {
- if (unlikely(!tipc_msg_extract(skb, &iskb, &ipos))) {
- pr_warn_ratelimited("Unable to extract msg, defq: %d\n",
- skb_queue_len(fdefq));
- return 0;
- }
- kfree_skb(skb);
- } else {
- /* Set fragment type for buf_append */
- if (msg_fragm_no(hdr) == 1)
- msg_set_type(hdr, FIRST_FRAGMENT);
- else if (msg_fragm_no(hdr) < msg_nof_fragms(hdr))
- msg_set_type(hdr, FRAGMENT);
- else
- msg_set_type(hdr, LAST_FRAGMENT);
- if (!tipc_buf_append(reasm_tnlmsg, &skb)) {
- /* Successful but non-complete reassembly? */
- if (*reasm_tnlmsg || link_is_bc_rcvlink(l))
- return 0;
- pr_warn_ratelimited("Unable to reassemble tunnel msg\n");
- return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
- }
- iskb = skb;
- }
- 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)));
- return rc;
- }
- static int tipc_link_release_pkts(struct tipc_link *l, u16 acked)
- {
- int released = 0;
- 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++;
- }
- 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, u16 gap)
- {
- 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 || !gap)
- 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
- *
- * In case of a repeated retransmit failures, the call will return shortly
- * with a returned code (e.g. TIPC_LINK_DOWN_EVT)
- */
- static int 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;
- bool retransmitted = false;
- u16 ack = l->rcv_nxt - 1;
- bool passed = false;
- u16 released = 0;
- u16 seqno, n = 0;
- int rc = 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);
- released++;
- } else if (less_eq(seqno, acked + gap)) {
- /* First, check if repeated retrans failures occurs? */
- if (!passed && link_retransmit_failure(l, l, &rc))
- return rc;
- passed = true;
- /* retransmit skb if unrestricted*/
- 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, 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++;
- retransmitted = true;
- /* Increase actual retrans counter & mark first time */
- if (!TIPC_SKB_CB(skb)->retr_cnt++)
- TIPC_SKB_CB(skb)->retr_stamp = jiffies;
- } 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;
- }
- }
- if (released || retransmitted)
- tipc_link_update_cwin(l, released, retransmitted);
- if (released)
- tipc_link_advance_backlog(l, xmitq);
- return 0;
- }
- /* 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;
- struct sk_buff_head *dfq = &l->deferdq;
- u32 defq_len = skb_queue_len(dfq);
- 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)) {
- u16 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt;
- tipc_link_build_proto_msg(l, STATE_MSG, 0, 0,
- rcvgap, 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 released = 0;
- 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;
- kfree_skb(skb);
- break;
- }
- /* Drop if outside receive window */
- if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
- l->stats.duplicates++;
- kfree_skb(skb);
- break;
- }
- released += tipc_link_release_pkts(l, msg_ack(hdr));
- /* 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)));
- /* Forward queues and wake up waiting users */
- if (released) {
- tipc_link_update_cwin(l, released, 0);
- tipc_link_advance_backlog(l, xmitq);
- if (unlikely(!skb_queue_empty(&l->wakeupq)))
- link_prepare_wakeup(l);
- }
- 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 ((probe || probe_reply) && !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, rcvgap);
- 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, frags;
- u16 pktlen, pktcnt, seqno = l->snd_nxt;
- bool pktcnt_need_update = false;
- u16 syncpt;
- int rc;
- if (!tnl)
- return;
- __skb_queue_head_init(&tnlq);
- /* Link Synching:
- * From now on, send only one single ("dummy") SYNCH message
- * to peer. The SYNCH message does not contain any data, just
- * a header conveying the synch point to the peer.
- */
- if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) {
- tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG,
- INT_H_SIZE, 0, l->addr,
- tipc_own_addr(l->net),
- 0, 0, 0);
- if (!tnlskb) {
- pr_warn("%sunable to create dummy SYNCH_MSG\n",
- link_co_err);
- return;
- }
- hdr = buf_msg(tnlskb);
- syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1;
- msg_set_syncpt(hdr, syncpt);
- msg_set_bearer_id(hdr, l->peer_bearer_id);
- __skb_queue_tail(&tnlq, tnlskb);
- tipc_link_xmit(tnl, &tnlq, xmitq);
- return;
- }
- __skb_queue_head_init(&tmpxq);
- __skb_queue_head_init(&frags);
- /* 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);
- /* Tunnel link MTU is not large enough? This could be
- * due to:
- * 1) Link MTU has just changed or set differently;
- * 2) Or FAILOVER on the top of a SYNCH message
- *
- * The 2nd case should not happen if peer supports
- * TIPC_TUNNEL_ENHANCED
- */
- if (pktlen > tnl->mtu - INT_H_SIZE) {
- if (mtyp == FAILOVER_MSG &&
- (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) {
- rc = tipc_msg_fragment(skb, &tnlhdr, tnl->mtu,
- &frags);
- if (rc) {
- pr_warn("%sunable to frag msg: rc %d\n",
- link_co_err, rc);
- return;
- }
- pktcnt += skb_queue_len(&frags) - 1;
- pktcnt_need_update = true;
- skb_queue_splice_tail_init(&frags, &tnlq);
- continue;
- }
- /* Unluckily, peer doesn't have TIPC_TUNNEL_ENHANCED
- * => Just warn it and return!
- */
- pr_warn_ratelimited("%stoo large msg <%d, %d>: %d!\n",
- link_co_err, msg_user(hdr),
- msg_type(hdr), msg_size(hdr));
- return;
- }
- 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;
- }
- if (pktcnt_need_update)
- skb_queue_walk(&tnlq, skb) {
- hdr = buf_msg(skb);
- msg_set_msgcnt(hdr, pktcnt);
- }
- 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 endpoint 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.
- */
- 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 ((reply || msg_is_keepalive(hdr)) &&
- more(peers_snd_nxt, rcv_nxt) &&
- !tipc_link_is_synching(l) &&
- skb_queue_empty(&l->deferdq))
- rcvgap = peers_snd_nxt - l->rcv_nxt;
- if (rcvgap || reply)
- tipc_link_build_proto_msg(l, STATE_MSG, 0, reply,
- rcvgap, 0, 0, xmitq);
- rc |= tipc_link_advance_transmq(l, ack, gap, ga, xmitq);
- if (gap)
- l->stats.recv_nacks++;
- 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_bc_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_bc_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 min_win, u32 max_win)
- {
- int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE);
- l->min_win = min_win;
- l->ssthresh = max_win;
- l->max_win = max_win;
- l->window = min_win;
- l->backlog[TIPC_LOW_IMPORTANCE].limit = min_win * 2;
- l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = min_win * 4;
- l->backlog[TIPC_HIGH_IMPORTANCE].limit = min_win * 6;
- l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = min_win * 8;
- 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 max_win;
- max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
- if (max_win < TIPC_DEF_LINK_WIN || max_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->max_win))
- 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", 0);
- i += scnprintf(buf + i, sz - i, " %u", 0);
- 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;
- }