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linux-next/net/tipc/link.c
Jon Maloy b7ffa045e7 tipc: don't send gap blocks in ACK messages 
In the commit referred to below we eliminated sending of the 'gap'
indicator in regular ACK messages, reserving this to explicit NACK
ditto.

Unfortunately we missed to also eliminate building of the 'gap block'
area in ACK messages. This area is meant to report gaps in the
received packet sequence following the initial gap, so that lost
packets can be retransmitted earlier and received out-of-sequence
packets can be released earlier. However, the interpretation of those
blocks is dependent on a complete and correct sequence of gaps and
acks. Hence, when the initial gap indicator is missing a single gap
block will be interpreted as an acknowledgment of all preceding
packets. This may lead to packets being released prematurely from the
sender's transmit queue, with easily predicatble consequences.

We now fix this by not building any gap block area if there is no
initial gap to report.

Fixes: commit 02288248b0 ("tipc: eliminate gap indicator from ACK messages")
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-12-17 14:16:56 -08:00

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/*
* 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 = l->ssthresh;
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;
}
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