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kernel-ark/net/tipc/group.c
Michal Kubecek ae0be8de9a netlink: make nla_nest_start() add NLA_F_NESTED flag 
Even if the NLA_F_NESTED flag was introduced more than 11 years ago, most
netlink based interfaces (including recently added ones) are still not
setting it in kernel generated messages. Without the flag, message parsers
not aware of attribute semantics (e.g. wireshark dissector or libmnl's
mnl_nlmsg_fprintf()) cannot recognize nested attributes and won't display
the structure of their contents.

Unfortunately we cannot just add the flag everywhere as there may be
userspace applications which check nlattr::nla_type directly rather than
through a helper masking out the flags. Therefore the patch renames
nla_nest_start() to nla_nest_start_noflag() and introduces nla_nest_start()
as a wrapper adding NLA_F_NESTED. The calls which add NLA_F_NESTED manually
are rewritten to use nla_nest_start().

Except for changes in include/net/netlink.h, the patch was generated using
this semantic patch:

@@ expression E1, E2; @@
-nla_nest_start(E1, E2)
+nla_nest_start_noflag(E1, E2)

@@ expression E1, E2; @@
-nla_nest_start_noflag(E1, E2 | NLA_F_NESTED)
+nla_nest_start(E1, E2)

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-27 17:03:44 -04:00

952 lines
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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 "topsrv.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_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 small_win;
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;
};
struct tipc_group {
struct rb_root members;
struct list_head small_win;
struct list_head pending;
struct list_head active;
struct tipc_nlist dests;
struct net *net;
int subid;
u32 type;
u32 instance;
u32 scope;
u32 portid;
u16 member_cnt;
u16 active_cnt;
u16 max_active;
u16 bc_snd_nxt;
u16 bc_ackers;
bool *open;
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_open(struct tipc_member *m, bool *wakeup)
{
*wakeup = false;
if (list_empty(&m->small_win))
return;
list_del_init(&m->small_win);
*m->group->open = true;
*wakeup = true;
}
static void tipc_group_decr_active(struct tipc_group *grp,
struct tipc_member *m)
{
if (m->state == MBR_ACTIVE || m->state == MBR_RECLAIMING ||
m->state == MBR_REMITTED)
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_receiver(struct tipc_member *m)
{
return m && m->state != MBR_JOINING && m->state != MBR_LEAVING;
}
static bool tipc_group_is_sender(struct tipc_member *m)
{
return m && m->state != MBR_JOINING && m->state != MBR_PUBLISHED;
}
u32 tipc_group_exclude(struct tipc_group *grp)
{
if (!grp->loopback)
return grp->portid;
return 0;
}
struct tipc_group *tipc_group_create(struct net *net, u32 portid,
struct tipc_group_req *mreq,
bool *group_is_open)
{
u32 filter = TIPC_SUB_PORTS | TIPC_SUB_NO_STATUS;
bool global = mreq->scope != TIPC_NODE_SCOPE;
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->small_win);
INIT_LIST_HEAD(&grp->active);
INIT_LIST_HEAD(&grp->pending);
grp->members = RB_ROOT;
grp->net = net;
grp->portid = portid;
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;
grp->open = group_is_open;
*grp->open = false;
filter |= global ? TIPC_SUB_CLUSTER_SCOPE : TIPC_SUB_NODE_SCOPE;
if (tipc_topsrv_kern_subscr(net, portid, type, 0, ~0,
filter, &grp->subid))
return grp;
kfree(grp);
return NULL;
}
void tipc_group_join(struct net *net, struct tipc_group *grp, int *sk_rcvbuf)
{
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_JOIN_MSG, &xmitq);
tipc_group_update_member(m, 0);
}
tipc_node_distr_xmit(net, &xmitq);
*sk_rcvbuf = tipc_group_rcvbuf_limit(grp);
}
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);
}
static 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_receiver(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,
u32 instance, 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->small_win);
__skb_queue_head_init(&m->deferredq);
m->group = grp;
m->node = node;
m->port = port;
m->instance = instance;
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, u32 instance)
{
tipc_group_create_member(grp, node, port, instance, MBR_PUBLISHED);
}
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->small_win);
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_receiver(m))
return;
m->window -= len;
if (m->window >= ADV_IDLE)
return;
list_del_init(&m->small_win);
/* Sort member into small_window members' list */
list_for_each_entry_safe(_m, tmp, &grp->small_win, small_win) {
if (_m->window > m->window)
break;
}
list_add_tail(&m->small_win, &_m->small_win);
}
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;
u16 ackers = 0;
for (n = rb_first(&grp->members); n; n = rb_next(n)) {
m = container_of(n, struct tipc_member, tree_node);
if (tipc_group_is_receiver(m)) {
tipc_group_update_member(m, len);
m->bc_acked = prev;
ackers++;
}
}
/* Mark number of acknowledges to expect, if any */
if (ack)
grp->bc_ackers = ackers;
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);
if (!tipc_group_is_receiver(m)) {
*mbr = NULL;
return false;
}
*mbr = m;
if (m->window >= len)
return false;
*grp->open = false;
/* If not fully advertised, do it now to prevent mutual blocking */
adv = m->advertised;
state = m->state;
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) {
*grp->open = false;
return true;
}
if (list_empty(&grp->small_win))
return false;
m = list_first_entry(&grp->small_win, struct tipc_member, small_win);
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_sender(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);
blks = msg_blocks(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;
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, *pm;
m = tipc_group_find_member(grp, node, port);
if (!m)
return;
m->advertised -= blks;
switch (m->state) {
case MBR_JOINED:
/* First, decide if member can go active */
if (active_cnt <= max_active) {
m->state = MBR_ACTIVE;
list_add_tail(&m->list, active);
grp->active_cnt++;
tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
} else {
m->state = MBR_PENDING;
list_add_tail(&m->list, &grp->pending);
}
if (active_cnt < reclaim_limit)
break;
/* Reclaim from oldest active member, if possible */
if (!list_empty(active)) {
rm = list_first_entry(active, struct tipc_member, list);
rm->state = MBR_RECLAIMING;
list_del_init(&rm->list);
tipc_group_proto_xmit(grp, rm, GRP_RECLAIM_MSG, xmitq);
break;
}
/* Nobody to reclaim from; - revert oldest pending to JOINED */
pm = list_first_entry(&grp->pending, struct tipc_member, list);
list_del_init(&pm->list);
pm->state = MBR_JOINED;
tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq);
break;
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;
grp->active_cnt--;
if (m->advertised < ADV_IDLE) {
pr_warn_ratelimited("Rcv unexpected msg after REMIT\n");
tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
}
if (list_empty(&grp->pending))
return;
/* Set oldest pending member to active and advertise */
pm = list_first_entry(&grp->pending, struct tipc_member, list);
pm->state = MBR_ACTIVE;
list_move_tail(&pm->list, &grp->active);
grp->active_cnt++;
tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq);
break;
case MBR_RECLAIMING:
case MBR_JOINING:
case MBR_LEAVING:
default:
break;
}
}
static void tipc_group_create_event(struct tipc_group *grp,
struct tipc_member *m,
u32 event, u16 seqno,
struct sk_buff_head *inputq)
{ u32 dnode = tipc_own_addr(grp->net);
struct tipc_event evt;
struct sk_buff *skb;
struct tipc_msg *hdr;
memset(&evt, 0, sizeof(evt));
evt.event = event;
evt.found_lower = m->instance;
evt.found_upper = m->instance;
evt.port.ref = m->port;
evt.port.node = m->node;
evt.s.seq.type = grp->type;
evt.s.seq.lower = m->instance;
evt.s.seq.upper = m->instance;
skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_GRP_MEMBER_EVT,
GROUP_H_SIZE, sizeof(evt), dnode, m->node,
grp->portid, m->port, 0);
if (!skb)
return;
hdr = buf_msg(skb);
msg_set_nametype(hdr, grp->type);
msg_set_grp_evt(hdr, event);
msg_set_dest_droppable(hdr, true);
msg_set_grp_bc_seqno(hdr, seqno);
memcpy(msg_data(hdr), &evt, sizeof(evt));
TIPC_SKB_CB(skb)->orig_member = m->instance;
__skb_queue_tail(inputq, skb);
}
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);
}
msg_set_dest_droppable(hdr, true);
__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;
u16 remitted, in_flight;
if (!grp)
return;
if (grp->scope == TIPC_NODE_SCOPE && node != tipc_own_addr(grp->net))
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,
0, MBR_JOINING);
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 necessary */
if (m->state != MBR_PUBLISHED)
return;
/* Member can be taken into service */
m->state = MBR_JOINED;
tipc_group_open(m, usr_wakeup);
tipc_group_update_member(m, 0);
tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
tipc_group_create_event(grp, m, TIPC_PUBLISHED,
m->bc_syncpt, inputq);
return;
case GRP_LEAVE_MSG:
if (!m)
return;
m->bc_syncpt = msg_grp_bc_syncpt(hdr);
list_del_init(&m->list);
tipc_group_open(m, usr_wakeup);
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
tipc_group_create_event(grp, m, TIPC_WITHDRAWN,
m->bc_syncpt, inputq);
return;
case GRP_ADV_MSG:
if (!m)
return;
m->window += msg_adv_win(hdr);
tipc_group_open(m, usr_wakeup);
return;
case GRP_ACK_MSG:
if (!m)
return;
m->bc_acked = msg_grp_bc_acked(hdr);
if (--grp->bc_ackers)
return;
list_del_init(&m->small_win);
*m->group->open = true;
*usr_wakeup = true;
tipc_group_update_member(m, 0);
return;
case GRP_RECLAIM_MSG:
if (!m)
return;
tipc_group_proto_xmit(grp, m, GRP_REMIT_MSG, xmitq);
m->window = ADV_IDLE;
tipc_group_open(m, usr_wakeup);
return;
case GRP_REMIT_MSG:
if (!m || m->state != MBR_RECLAIMING)
return;
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;
m->advertised = ADV_IDLE + in_flight;
return;
}
/* This should never happen */
if (m->advertised < remitted)
pr_warn_ratelimited("Unexpected REMIT msg\n");
/* All messages preceding the REMIT have been read */
m->state = MBR_JOINED;
grp->active_cnt--;
m->advertised = ADV_IDLE;
/* 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 tipc_msg *hdr,
struct sk_buff_head *inputq,
struct sk_buff_head *xmitq)
{
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;
u32 self;
if (!grp)
return;
net = grp->net;
self = tipc_own_addr(net);
if (!grp->loopback && node == self && port == grp->portid)
return;
m = tipc_group_find_member(grp, node, port);
switch (event) {
case TIPC_PUBLISHED:
/* Send and wait for arrival of JOIN message if necessary */
if (!m) {
m = tipc_group_create_member(grp, node, port, instance,
MBR_PUBLISHED);
if (!m)
break;
tipc_group_update_member(m, 0);
tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq);
break;
}
if (m->state != MBR_JOINING)
break;
/* Member can be taken into service */
m->instance = instance;
m->state = MBR_JOINED;
tipc_group_open(m, usr_wakeup);
tipc_group_update_member(m, 0);
tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq);
tipc_group_create_event(grp, m, TIPC_PUBLISHED,
m->bc_syncpt, inputq);
break;
case TIPC_WITHDRAWN:
if (!m)
break;
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
list_del_init(&m->list);
tipc_group_open(m, usr_wakeup);
/* Only send event if no LEAVE message can be expected */
if (!tipc_node_is_up(net, node))
tipc_group_create_event(grp, m, TIPC_WITHDRAWN,
m->bc_rcv_nxt, inputq);
break;
default:
break;
}
*sk_rcvbuf = tipc_group_rcvbuf_limit(grp);
}
int tipc_group_fill_sock_diag(struct tipc_group *grp, struct sk_buff *skb)
{
struct nlattr *group = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_GROUP);
if (!group)
return -EMSGSIZE;
if (nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_ID,
grp->type) ||
nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_INSTANCE,
grp->instance) ||
nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_BC_SEND_NEXT,
grp->bc_snd_nxt))
goto group_msg_cancel;
if (grp->scope == TIPC_NODE_SCOPE)
if (nla_put_flag(skb, TIPC_NLA_SOCK_GROUP_NODE_SCOPE))
goto group_msg_cancel;
if (grp->scope == TIPC_CLUSTER_SCOPE)
if (nla_put_flag(skb, TIPC_NLA_SOCK_GROUP_CLUSTER_SCOPE))
goto group_msg_cancel;
if (*grp->open)
if (nla_put_flag(skb, TIPC_NLA_SOCK_GROUP_OPEN))
goto group_msg_cancel;
nla_nest_end(skb, group);
return 0;
group_msg_cancel:
nla_nest_cancel(skb, group);
return -1;
}
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