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linux-sg2042/net/tipc/group.c

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/*
* net/tipc/group.c: TIPC group messaging code
*
* Copyright (c) 2017, Ericsson AB
* 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 "addr.h"
#include "group.h"
#include "bcast.h"
#include "server.h"
#include "msg.h"
#include "socket.h"
#include "node.h"
#include "name_table.h"
#include "subscr.h"
#define ADV_UNIT (((MAX_MSG_SIZE + MAX_H_SIZE) / FLOWCTL_BLK_SZ) + 1)
#define ADV_IDLE ADV_UNIT
#define ADV_ACTIVE (ADV_UNIT * 12)
enum mbr_state {
MBR_QUARANTINED,
MBR_DISCOVERED,
MBR_JOINING,
MBR_PUBLISHED,
MBR_JOINED,
MBR_PENDING,
MBR_ACTIVE,
MBR_RECLAIMING,
MBR_REMITTED,
MBR_LEAVING
};
struct tipc_member {
struct rb_node tree_node;
struct list_head list;
struct list_head congested;
struct sk_buff *event_msg;
struct sk_buff_head deferredq;
struct tipc_group *group;
u32 node;
u32 port;
u32 instance;
enum mbr_state state;
u16 advertised;
u16 window;
u16 bc_rcv_nxt;
u16 bc_syncpt;
u16 bc_acked;
bool usr_pending;
};
struct tipc_group {
struct rb_root members;
struct list_head congested;
struct list_head pending;
struct list_head active;
struct list_head reclaiming;
struct tipc_nlist dests;
struct net *net;
int subid;
u32 type;
u32 instance;
u32 domain;
u32 scope;
u32 portid;
u16 member_cnt;
u16 active_cnt;
u16 max_active;
u16 bc_snd_nxt;
u16 bc_ackers;
bool loopback;
bool events;
};
static void tipc_group_proto_xmit(struct tipc_group *grp, struct tipc_member *m,
int mtyp, struct sk_buff_head *xmitq);
static void tipc_group_decr_active(struct tipc_group *grp,
struct tipc_member *m)
{
if (m->state == MBR_ACTIVE || m->state == MBR_RECLAIMING)
grp->active_cnt--;
}
static int tipc_group_rcvbuf_limit(struct tipc_group *grp)
{
int max_active, active_pool, idle_pool;
int mcnt = grp->member_cnt + 1;
/* Limit simultaneous reception from other members */
max_active = min(mcnt / 8, 64);
max_active = max(max_active, 16);
grp->max_active = max_active;
/* Reserve blocks for active and idle members */
active_pool = max_active * ADV_ACTIVE;
idle_pool = (mcnt - max_active) * ADV_IDLE;
/* Scale to bytes, considering worst-case truesize/msgsize ratio */
return (active_pool + idle_pool) * FLOWCTL_BLK_SZ * 4;
}
u16 tipc_group_bc_snd_nxt(struct tipc_group *grp)
{
return grp->bc_snd_nxt;
}
static bool tipc_group_is_enabled(struct tipc_member *m)
{
return m->state != MBR_QUARANTINED && m->state != MBR_LEAVING;
}
static bool tipc_group_is_receiver(struct tipc_member *m)
{
return m && m->state >= MBR_JOINED;
}
u32 tipc_group_exclude(struct tipc_group *grp)
{
if (!grp->loopback)
return grp->portid;
return 0;
}
int tipc_group_size(struct tipc_group *grp)
{
return grp->member_cnt;
}
struct tipc_group *tipc_group_create(struct net *net, u32 portid,
struct tipc_group_req *mreq)
{
struct tipc_group *grp;
u32 type = mreq->type;
grp = kzalloc(sizeof(*grp), GFP_ATOMIC);
if (!grp)
return NULL;
tipc_nlist_init(&grp->dests, tipc_own_addr(net));
INIT_LIST_HEAD(&grp->congested);
INIT_LIST_HEAD(&grp->active);
INIT_LIST_HEAD(&grp->pending);
INIT_LIST_HEAD(&grp->reclaiming);
grp->members = RB_ROOT;
grp->net = net;
grp->portid = portid;
grp->domain = addr_domain(net, mreq->scope);
grp->type = type;
grp->instance = mreq->instance;
grp->scope = mreq->scope;
grp->loopback = mreq->flags & TIPC_GROUP_LOOPBACK;
grp->events = mreq->flags & TIPC_GROUP_MEMBER_EVTS;
if (tipc_topsrv_kern_subscr(net, portid, type, 0, ~0, &grp->subid))
return grp;
kfree(grp);
return NULL;
}
void tipc_group_delete(struct net *net, struct tipc_group *grp)
{
struct rb_root *tree = &grp->members;
struct tipc_member *m, *tmp;
struct sk_buff_head xmitq;
__skb_queue_head_init(&xmitq);
rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) {
tipc_group_proto_xmit(grp, m, GRP_LEAVE_MSG, &xmitq);
list_del(&m->list);
kfree(m);
}
tipc_node_distr_xmit(net, &xmitq);
tipc_nlist_purge(&grp->dests);
tipc_topsrv_kern_unsubscr(net, grp->subid);
kfree(grp);
}
struct tipc_member *tipc_group_find_member(struct tipc_group *grp,
u32 node, u32 port)
{
struct rb_node *n = grp->members.rb_node;
u64 nkey, key = (u64)node << 32 | port;
struct tipc_member *m;
while (n) {
m = container_of(n, struct tipc_member, tree_node);
nkey = (u64)m->node << 32 | m->port;
if (key < nkey)
n = n->rb_left;
else if (key > nkey)
n = n->rb_right;
else
return m;
}
return NULL;
}
static struct tipc_member *tipc_group_find_dest(struct tipc_group *grp,
u32 node, u32 port)
{
struct tipc_member *m;
m = tipc_group_find_member(grp, node, port);
if (m && tipc_group_is_enabled(m))
return m;
return NULL;
}
static struct tipc_member *tipc_group_find_node(struct tipc_group *grp,
u32 node)
{
struct tipc_member *m;
struct rb_node *n;
for (n = rb_first(&grp->members); n; n = rb_next(n)) {
m = container_of(n, struct tipc_member, tree_node);
if (m->node == node)
return m;
}
return NULL;
}
static void tipc_group_add_to_tree(struct tipc_group *grp,
struct tipc_member *m)
{
u64 nkey, key = (u64)m->node << 32 | m->port;
struct rb_node **n, *parent = NULL;
struct tipc_member *tmp;
n = &grp->members.rb_node;
while (*n) {
tmp = container_of(*n, struct tipc_member, tree_node);
parent = *n;
tmp = container_of(parent, struct tipc_member, tree_node);
nkey = (u64)tmp->node << 32 | tmp->port;
if (key < nkey)
n = &(*n)->rb_left;
else if (key > nkey)
n = &(*n)->rb_right;
else
return;
}
rb_link_node(&m->tree_node, parent, n);
rb_insert_color(&m->tree_node, &grp->members);
}
static struct tipc_member *tipc_group_create_member(struct tipc_group *grp,
u32 node, u32 port,
int state)
{
struct tipc_member *m;
m = kzalloc(sizeof(*m), GFP_ATOMIC);
if (!m)
return NULL;
INIT_LIST_HEAD(&m->list);
INIT_LIST_HEAD(&m->congested);
__skb_queue_head_init(&m->deferredq);
m->group = grp;
m->node = node;
m->port = port;
m->bc_acked = grp->bc_snd_nxt - 1;
grp->member_cnt++;
tipc_group_add_to_tree(grp, m);
tipc_nlist_add(&grp->dests, m->node);
m->state = state;
return m;
}
void tipc_group_add_member(struct tipc_group *grp, u32 node, u32 port)
{
tipc_group_create_member(grp, node, port, MBR_DISCOVERED);
}
static void tipc_group_delete_member(struct tipc_group *grp,
struct tipc_member *m)
{
rb_erase(&m->tree_node, &grp->members);
grp->member_cnt--;
/* Check if we were waiting for replicast ack from this member */
if (grp->bc_ackers && less(m->bc_acked, grp->bc_snd_nxt - 1))
grp->bc_ackers--;
list_del_init(&m->list);
list_del_init(&m->congested);
tipc_group_decr_active(grp, m);
/* If last member on a node, remove node from dest list */
if (!tipc_group_find_node(grp, m->node))
tipc_nlist_del(&grp->dests, m->node);
kfree(m);
}
struct tipc_nlist *tipc_group_dests(struct tipc_group *grp)
{
return &grp->dests;
}
void tipc_group_self(struct tipc_group *grp, struct tipc_name_seq *seq,
int *scope)
{
seq->type = grp->type;
seq->lower = grp->instance;
seq->upper = grp->instance;
*scope = grp->scope;
}
void tipc_group_update_member(struct tipc_member *m, int len)
{
struct tipc_group *grp = m->group;
struct tipc_member *_m, *tmp;
if (!tipc_group_is_enabled(m))
return;
m->window -= len;
if (m->window >= ADV_IDLE)
return;
if (!list_empty(&m->congested))
return;
/* Sort member into congested members' list */
list_for_each_entry_safe(_m, tmp, &grp->congested, congested) {
if (m->window > _m->window)
continue;
list_add_tail(&m->congested, &_m->congested);
return;
}
list_add_tail(&m->congested, &grp->congested);
}
void tipc_group_update_bc_members(struct tipc_group *grp, int len, bool ack)
{
u16 prev = grp->bc_snd_nxt - 1;
struct tipc_member *m;
struct rb_node *n;
for (n = rb_first(&grp->members); n; n = rb_next(n)) {
m = container_of(n, struct tipc_member, tree_node);
if (tipc_group_is_enabled(m)) {
tipc_group_update_member(m, len);
m->bc_acked = prev;
}
}
/* Mark number of acknowledges to expect, if any */
if (ack)
grp->bc_ackers = grp->member_cnt;
grp->bc_snd_nxt++;
}
bool tipc_group_cong(struct tipc_group *grp, u32 dnode, u32 dport,
int len, struct tipc_member **mbr)
{
struct sk_buff_head xmitq;
struct tipc_member *m;
int adv, state;
m = tipc_group_find_dest(grp, dnode, dport);
*mbr = m;
if (!m)
return false;
if (m->usr_pending)
return true;
if (m->window >= len)
return false;
m->usr_pending = true;
/* If not fully advertised, do it now to prevent mutual blocking */
adv = m->advertised;
state = m->state;
if (state < MBR_JOINED)
return true;
if (state == MBR_JOINED && adv == ADV_IDLE)
return true;
if (state == MBR_ACTIVE && adv == ADV_ACTIVE)
return true;
if (state == MBR_PENDING && adv == ADV_IDLE)
return true;
skb_queue_head_init(&xmitq);
tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, &xmitq);
tipc_node_distr_xmit(grp->net, &xmitq);
return true;
}
bool tipc_group_bc_cong(struct tipc_group *grp, int len)
{
struct tipc_member *m = NULL;
/* If prev bcast was replicast, reject until all receivers have acked */
if (grp->bc_ackers)
return true;
if (list_empty(&grp->congested))
return false;
m = list_first_entry(&grp->congested, struct tipc_member, congested);
if (m->window >= len)
return false;
return tipc_group_cong(grp, m->node, m->port, len, &m);
}
/* tipc_group_sort_msg() - sort msg into queue by bcast sequence number
*/
static void tipc_group_sort_msg(struct sk_buff *skb, struct sk_buff_head *defq)
{
struct tipc_msg *_hdr, *hdr = buf_msg(skb);
u16 bc_seqno = msg_grp_bc_seqno(hdr);
struct sk_buff *_skb, *tmp;
int mtyp = msg_type(hdr);
/* Bcast/mcast may be bypassed by ucast or other bcast, - sort it in */
if (mtyp == TIPC_GRP_BCAST_MSG || mtyp == TIPC_GRP_MCAST_MSG) {
skb_queue_walk_safe(defq, _skb, tmp) {
_hdr = buf_msg(_skb);
if (!less(bc_seqno, msg_grp_bc_seqno(_hdr)))
continue;
__skb_queue_before(defq, _skb, skb);
return;
}
/* Bcast was not bypassed, - add to tail */
}
/* Unicasts are never bypassed, - always add to tail */
__skb_queue_tail(defq, skb);
}
/* tipc_group_filter_msg() - determine if we should accept arriving message
*/
void tipc_group_filter_msg(struct tipc_group *grp, struct sk_buff_head *inputq,
struct sk_buff_head *xmitq)
{
struct sk_buff *skb = __skb_dequeue(inputq);
bool ack, deliver, update, leave = false;
struct sk_buff_head *defq;
struct tipc_member *m;
struct tipc_msg *hdr;
u32 node, port;
int mtyp, blks;
if (!skb)
return;
hdr = buf_msg(skb);
node = msg_orignode(hdr);
port = msg_origport(hdr);
if (!msg_in_group(hdr))
goto drop;
m = tipc_group_find_member(grp, node, port);
if (!tipc_group_is_receiver(m))
goto drop;
if (less(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt))
goto drop;
TIPC_SKB_CB(skb)->orig_member = m->instance;
defq = &m->deferredq;
tipc_group_sort_msg(skb, defq);
while ((skb = skb_peek(defq))) {
hdr = buf_msg(skb);
mtyp = msg_type(hdr);
deliver = true;
ack = false;
update = false;
if (more(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt))
break;
/* Decide what to do with message */
switch (mtyp) {
case TIPC_GRP_MCAST_MSG:
if (msg_nameinst(hdr) != grp->instance) {
update = true;
deliver = false;
}
/* Fall thru */
case TIPC_GRP_BCAST_MSG:
m->bc_rcv_nxt++;
ack = msg_grp_bc_ack_req(hdr);
break;
case TIPC_GRP_UCAST_MSG:
break;
case TIPC_GRP_MEMBER_EVT:
if (m->state == MBR_LEAVING)
leave = true;
if (!grp->events)
deliver = false;
break;
default:
break;
}
/* Execute decisions */
__skb_dequeue(defq);
if (deliver)
__skb_queue_tail(inputq, skb);
else
kfree_skb(skb);
if (ack)
tipc_group_proto_xmit(grp, m, GRP_ACK_MSG, xmitq);
if (leave) {
__skb_queue_purge(defq);
tipc_group_delete_member(grp, m);
break;
}
if (!update)
continue;
blks = msg_blocks(hdr);
tipc_group_update_rcv_win(grp, blks, node, port, xmitq);
}
return;
drop:
kfree_skb(skb);
}
void tipc_group_update_rcv_win(struct tipc_group *grp, int blks, u32 node,
u32 port, struct sk_buff_head *xmitq)
{
struct list_head *active = &grp->active;
int max_active = grp->max_active;
int reclaim_limit = max_active * 3 / 4;
int active_cnt = grp->active_cnt;
struct tipc_member *m, *rm;
m = tipc_group_find_member(grp, node, port);
if (!m)
return;
m->advertised -= blks;
switch (m->state) {
case MBR_JOINED:
/* Reclaim advertised space from least active member */
if (!list_empty(active) && active_cnt >= reclaim_limit) {
rm = list_first_entry(active, struct tipc_member, list);
rm->state = MBR_RECLAIMING;
list_move_tail(&rm->list, &grp->reclaiming);
tipc_group_proto_xmit(grp, rm, GRP_RECLAIM_MSG, xmitq);
}
/* If max active, become pending and wait for reclaimed space */
if (active_cnt >= max_active) {
m->state = MBR_PENDING;
list_add_tail(&m->list, &grp->pending);
break;
}
/* Otherwise become active */
m->state = MBR_ACTIVE;
list_add_tail(&m->list, &grp->active);
grp->active_cnt++;
/* Fall through */
case MBR_ACTIVE:
if (!list_is_last(&m->list, &grp->active))
list_move_tail(&m->list, &grp->active);
if (m->advertised > (ADV_ACTIVE * 3 / 4))
break;
tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
break;
case MBR_REMITTED:
if (m->advertised > ADV_IDLE)
break;
m->state = MBR_JOINED;
if (m->advertised < ADV_IDLE) {
pr_warn_ratelimited("Rcv unexpected msg after REMIT\n");
tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
}
break;
case MBR_RECLAIMING:
case MBR_DISCOVERED:
case MBR_JOINING:
case MBR_LEAVING:
default:
break;
}
}
static void tipc_group_proto_xmit(struct tipc_group *grp, struct tipc_member *m,
int mtyp, struct sk_buff_head *xmitq)
{
struct tipc_msg *hdr;
struct sk_buff *skb;
int adv = 0;
skb = tipc_msg_create(GROUP_PROTOCOL, mtyp, INT_H_SIZE, 0,
m->node, tipc_own_addr(grp->net),
m->port, grp->portid, 0);
if (!skb)
return;
if (m->state == MBR_ACTIVE)
adv = ADV_ACTIVE - m->advertised;
else if (m->state == MBR_JOINED || m->state == MBR_PENDING)
adv = ADV_IDLE - m->advertised;
hdr = buf_msg(skb);
if (mtyp == GRP_JOIN_MSG) {
msg_set_grp_bc_syncpt(hdr, grp->bc_snd_nxt);
msg_set_adv_win(hdr, adv);
m->advertised += adv;
} else if (mtyp == GRP_LEAVE_MSG) {
msg_set_grp_bc_syncpt(hdr, grp->bc_snd_nxt);
} else if (mtyp == GRP_ADV_MSG) {
msg_set_adv_win(hdr, adv);
m->advertised += adv;
} else if (mtyp == GRP_ACK_MSG) {
msg_set_grp_bc_acked(hdr, m->bc_rcv_nxt);
} else if (mtyp == GRP_REMIT_MSG) {
msg_set_grp_remitted(hdr, m->window);
}
__skb_queue_tail(xmitq, skb);
}
void tipc_group_proto_rcv(struct tipc_group *grp, bool *usr_wakeup,
struct tipc_msg *hdr, struct sk_buff_head *inputq,
struct sk_buff_head *xmitq)
{
u32 node = msg_orignode(hdr);
u32 port = msg_origport(hdr);
struct tipc_member *m, *pm;
struct tipc_msg *ehdr;
u16 remitted, in_flight;
if (!grp)
return;
m = tipc_group_find_member(grp, node, port);
switch (msg_type(hdr)) {
case GRP_JOIN_MSG:
if (!m)
m = tipc_group_create_member(grp, node, port,
MBR_QUARANTINED);
if (!m)
return;
m->bc_syncpt = msg_grp_bc_syncpt(hdr);
m->bc_rcv_nxt = m->bc_syncpt;
m->window += msg_adv_win(hdr);
/* Wait until PUBLISH event is received */
if (m->state == MBR_DISCOVERED) {
m->state = MBR_JOINING;
} else if (m->state == MBR_PUBLISHED) {
m->state = MBR_JOINED;
*usr_wakeup = true;
m->usr_pending = false;
tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
ehdr = buf_msg(m->event_msg);
msg_set_grp_bc_seqno(ehdr, m->bc_syncpt);
__skb_queue_tail(inputq, m->event_msg);
}
if (m->window < ADV_IDLE)
tipc_group_update_member(m, 0);
else
list_del_init(&m->congested);
return;
case GRP_LEAVE_MSG:
if (!m)
return;
m->bc_syncpt = msg_grp_bc_syncpt(hdr);
/* Wait until WITHDRAW event is received */
if (m->state != MBR_LEAVING) {
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
return;
}
/* Otherwise deliver already received WITHDRAW event */
ehdr = buf_msg(m->event_msg);
msg_set_grp_bc_seqno(ehdr, m->bc_syncpt);
__skb_queue_tail(inputq, m->event_msg);
*usr_wakeup = true;
list_del_init(&m->congested);
return;
case GRP_ADV_MSG:
if (!m)
return;
m->window += msg_adv_win(hdr);
*usr_wakeup = m->usr_pending;
m->usr_pending = false;
list_del_init(&m->congested);
return;
case GRP_ACK_MSG:
if (!m)
return;
m->bc_acked = msg_grp_bc_acked(hdr);
if (--grp->bc_ackers)
break;
*usr_wakeup = true;
m->usr_pending = false;
return;
case GRP_RECLAIM_MSG:
if (!m)
return;
*usr_wakeup = m->usr_pending;
m->usr_pending = false;
tipc_group_proto_xmit(grp, m, GRP_REMIT_MSG, xmitq);
m->window = ADV_IDLE;
return;
case GRP_REMIT_MSG:
if (!m || m->state != MBR_RECLAIMING)
return;
list_del_init(&m->list);
grp->active_cnt--;
remitted = msg_grp_remitted(hdr);
/* Messages preceding the REMIT still in receive queue */
if (m->advertised > remitted) {
m->state = MBR_REMITTED;
in_flight = m->advertised - remitted;
}
/* All messages preceding the REMIT have been read */
if (m->advertised <= remitted) {
m->state = MBR_JOINED;
in_flight = 0;
}
/* ..and the REMIT overtaken by more messages => re-advertise */
if (m->advertised < remitted)
tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
m->advertised = ADV_IDLE + in_flight;
/* Set oldest pending member to active and advertise */
if (list_empty(&grp->pending))
return;
pm = list_first_entry(&grp->pending, struct tipc_member, list);
pm->state = MBR_ACTIVE;
list_move_tail(&pm->list, &grp->active);
grp->active_cnt++;
if (pm->advertised <= (ADV_ACTIVE * 3 / 4))
tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq);
return;
default:
pr_warn("Received unknown GROUP_PROTO message\n");
}
}
/* tipc_group_member_evt() - receive and handle a member up/down event
*/
void tipc_group_member_evt(struct tipc_group *grp,
bool *usr_wakeup,
int *sk_rcvbuf,
struct sk_buff *skb,
struct sk_buff_head *inputq,
struct sk_buff_head *xmitq)
{
struct tipc_msg *hdr = buf_msg(skb);
struct tipc_event *evt = (void *)msg_data(hdr);
u32 instance = evt->found_lower;
u32 node = evt->port.node;
u32 port = evt->port.ref;
int event = evt->event;
struct tipc_member *m;
struct net *net;
bool node_up;
u32 self;
if (!grp)
goto drop;
net = grp->net;
self = tipc_own_addr(net);
if (!grp->loopback && node == self && port == grp->portid)
goto drop;
/* Convert message before delivery to user */
msg_set_hdr_sz(hdr, GROUP_H_SIZE);
msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
msg_set_type(hdr, TIPC_GRP_MEMBER_EVT);
msg_set_origport(hdr, port);
msg_set_orignode(hdr, node);
msg_set_nametype(hdr, grp->type);
msg_set_grp_evt(hdr, event);
m = tipc_group_find_member(grp, node, port);
if (event == TIPC_PUBLISHED) {
if (!m)
m = tipc_group_create_member(grp, node, port,
MBR_DISCOVERED);
if (!m)
goto drop;
/* Hold back event if JOIN message not yet received */
if (m->state == MBR_DISCOVERED) {
m->event_msg = skb;
m->state = MBR_PUBLISHED;
} else {
msg_set_grp_bc_seqno(hdr, m->bc_syncpt);
__skb_queue_tail(inputq, skb);
m->state = MBR_JOINED;
*usr_wakeup = true;
m->usr_pending = false;
}
m->instance = instance;
TIPC_SKB_CB(skb)->orig_member = m->instance;
tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq);
if (m->window < ADV_IDLE)
tipc_group_update_member(m, 0);
else
list_del_init(&m->congested);
} else if (event == TIPC_WITHDRAWN) {
if (!m)
goto drop;
TIPC_SKB_CB(skb)->orig_member = m->instance;
*usr_wakeup = true;
m->usr_pending = false;
node_up = tipc_node_is_up(net, node);
/* Hold back event if more messages might be expected */
if (m->state != MBR_LEAVING && node_up) {
m->event_msg = skb;
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
} else {
if (node_up)
msg_set_grp_bc_seqno(hdr, m->bc_syncpt);
else
msg_set_grp_bc_seqno(hdr, m->bc_rcv_nxt);
__skb_queue_tail(inputq, skb);
}
list_del_init(&m->congested);
}
*sk_rcvbuf = tipc_group_rcvbuf_limit(grp);
return;
drop:
kfree_skb(skb);
}
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