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OpenCloudOS-Kernel/net/tipc/bcast.c

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/*
* net/tipc/bcast.c: TIPC broadcast code
*
* Copyright (c) 2004-2006, 2014-2015, Ericsson AB
* Copyright (c) 2004, Intel Corporation.
* Copyright (c) 2005, 2010-2011, 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 <linux/tipc_config.h>
#include "socket.h"
#include "msg.h"
#include "bcast.h"
#include "name_distr.h"
#include "link.h"
#include "node.h"
#define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */
#define BCLINK_WIN_DEFAULT 50 /* bcast link window size (default) */
#define BCLINK_WIN_MIN 32 /* bcast minimum link window size */
const char tipc_bclink_name[] = "broadcast-link";
/**
* struct tipc_bcbearer_pair - a pair of bearers used by broadcast link
* @primary: pointer to primary bearer
* @secondary: pointer to secondary bearer
*
* Bearers must have same priority and same set of reachable destinations
* to be paired.
*/
struct tipc_bcbearer_pair {
struct tipc_bearer *primary;
struct tipc_bearer *secondary;
};
#define BCBEARER MAX_BEARERS
/**
* struct tipc_bcbearer - bearer used by broadcast link
* @bearer: (non-standard) broadcast bearer structure
* @media: (non-standard) broadcast media structure
* @bpairs: array of bearer pairs
* @bpairs_temp: temporary array of bearer pairs used by tipc_bcbearer_sort()
* @remains: temporary node map used by tipc_bcbearer_send()
* @remains_new: temporary node map used tipc_bcbearer_send()
*
* Note: The fields labelled "temporary" are incorporated into the bearer
* to avoid consuming potentially limited stack space through the use of
* large local variables within multicast routines. Concurrent access is
* prevented through use of the spinlock "bcast_lock".
*/
struct tipc_bcbearer {
struct tipc_bearer bearer;
struct tipc_media media;
struct tipc_bcbearer_pair bpairs[MAX_BEARERS];
struct tipc_bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1];
struct tipc_node_map remains;
struct tipc_node_map remains_new;
};
/**
* struct tipc_bc_base - link used for broadcast messages
* @link: broadcast send link structure
* @node: (non-standard) node structure representing b'cast link's peer node
* @bcast_nodes: map of broadcast-capable nodes
* @retransmit_to: node that most recently requested a retransmit
* @dest_nnt: array indicating number of reachable destinations per bearer
* @bearers: array of bearers, sorted by number of reachable destinations
*
* Handles sequence numbering, fragmentation, bundling, etc.
*/
struct tipc_bc_base {
struct tipc_link *link;
struct tipc_node node;
struct sk_buff_head arrvq;
struct sk_buff_head inputq;
struct sk_buff_head namedq;
int dests[MAX_BEARERS];
int primary_bearer;
struct tipc_node_map bcast_nodes;
struct tipc_node *retransmit_to;
};
static struct tipc_bc_base *tipc_bc_base(struct net *net)
{
return tipc_net(net)->bcbase;
}
/**
* tipc_nmap_equal - test for equality of node maps
*/
static int tipc_nmap_equal(struct tipc_node_map *nm_a,
struct tipc_node_map *nm_b)
{
return !memcmp(nm_a, nm_b, sizeof(*nm_a));
}
static void tipc_bcbearer_xmit(struct net *net, struct sk_buff_head *xmitq);
static void tipc_nmap_diff(struct tipc_node_map *nm_a,
struct tipc_node_map *nm_b,
struct tipc_node_map *nm_diff);
static void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node);
static void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node);
static void tipc_bclink_lock(struct net *net)
{
tipc_bcast_lock(net);
}
static void tipc_bclink_unlock(struct net *net)
{
tipc_bcast_unlock(net);
}
void tipc_bclink_input(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
tipc_sk_mcast_rcv(net, &tn->bcbase->arrvq, &tn->bcbase->inputq);
}
uint tipc_bcast_get_mtu(void)
{
return MAX_PKT_DEFAULT_MCAST;
}
static u16 bcbuf_acks(struct sk_buff *skb)
{
return TIPC_SKB_CB(skb)->ackers;
}
static void bcbuf_set_acks(struct sk_buff *buf, u16 ackers)
{
TIPC_SKB_CB(buf)->ackers = ackers;
}
static void bcbuf_decr_acks(struct sk_buff *buf)
{
bcbuf_set_acks(buf, bcbuf_acks(buf) - 1);
}
/* tipc_bcbase_select_primary(): find a bearer with links to all destinations,
* if any, and make it primary bearer
*/
static void tipc_bcbase_select_primary(struct net *net)
{
struct tipc_bc_base *bb = tipc_bc_base(net);
int all_dests = tipc_link_bc_peers(bb->link);
int i;
bb->primary_bearer = INVALID_BEARER_ID;
if (!all_dests)
return;
for (i = 0; i < MAX_BEARERS; i++) {
if (bb->dests[i] < all_dests)
continue;
bb->primary_bearer = i;
/* Reduce risk that all nodes select same primary */
if ((i ^ tipc_own_addr(net)) & 1)
break;
}
}
void tipc_bcast_inc_bearer_dst_cnt(struct net *net, int bearer_id)
{
struct tipc_bc_base *bb = tipc_bc_base(net);
tipc_bcast_lock(net);
bb->dests[bearer_id]++;
tipc_bcbase_select_primary(net);
tipc_bcast_unlock(net);
}
void tipc_bcast_dec_bearer_dst_cnt(struct net *net, int bearer_id)
{
struct tipc_bc_base *bb = tipc_bc_base(net);
tipc_bcast_lock(net);
bb->dests[bearer_id]--;
tipc_bcbase_select_primary(net);
tipc_bcast_unlock(net);
}
static void bclink_set_last_sent(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_link *bcl = tn->bcl;
bcl->silent_intv_cnt = mod(bcl->snd_nxt - 1);
}
u32 tipc_bclink_get_last_sent(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
return tn->bcl->silent_intv_cnt;
}
static void bclink_update_last_sent(struct tipc_node *node, u32 seqno)
{
node->bclink.last_sent = less_eq(node->bclink.last_sent, seqno) ?
seqno : node->bclink.last_sent;
}
/**
* tipc_bclink_retransmit_to - get most recent node to request retransmission
*
* Called with bclink_lock locked
*/
struct tipc_node *tipc_bclink_retransmit_to(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
return tn->bcbase->retransmit_to;
}
/**
* bclink_retransmit_pkt - retransmit broadcast packets
* @after: sequence number of last packet to *not* retransmit
* @to: sequence number of last packet to retransmit
*
* Called with bclink_lock locked
*/
static void bclink_retransmit_pkt(struct tipc_net *tn, u32 after, u32 to)
{
struct sk_buff *skb;
struct tipc_link *bcl = tn->bcl;
skb_queue_walk(&bcl->transmq, skb) {
if (more(buf_seqno(skb), after)) {
tipc_link_retransmit(bcl, skb, mod(to - after));
break;
}
}
}
/**
* bclink_prepare_wakeup - prepare users for wakeup after congestion
* @bcl: broadcast link
* @resultq: queue for users which can be woken up
* Move a number of waiting users, as permitted by available space in
* the send queue, from link wait queue to specified queue for wakeup
*/
static void bclink_prepare_wakeup(struct tipc_link *bcl, struct sk_buff_head *resultq)
{
int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,};
int imp, lim;
struct sk_buff *skb, *tmp;
skb_queue_walk_safe(&bcl->wakeupq, skb, tmp) {
imp = TIPC_SKB_CB(skb)->chain_imp;
lim = bcl->window + bcl->backlog[imp].limit;
pnd[imp] += TIPC_SKB_CB(skb)->chain_sz;
if ((pnd[imp] + bcl->backlog[imp].len) >= lim)
continue;
skb_unlink(skb, &bcl->wakeupq);
skb_queue_tail(resultq, skb);
}
}
/**
* tipc_bclink_wakeup_users - wake up pending users
*
* Called with no locks taken
*/
void tipc_bclink_wakeup_users(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_link *bcl = tn->bcl;
struct sk_buff_head resultq;
skb_queue_head_init(&resultq);
bclink_prepare_wakeup(bcl, &resultq);
tipc_sk_rcv(net, &resultq);
}
/**
* tipc_bclink_acknowledge - handle acknowledgement of broadcast packets
* @n_ptr: node that sent acknowledgement info
* @acked: broadcast sequence # that has been acknowledged
*
* Node is locked, bclink_lock unlocked.
*/
void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
{
struct sk_buff *skb, *tmp;
unsigned int released = 0;
struct net *net = n_ptr->net;
struct tipc_net *tn = net_generic(net, tipc_net_id);
if (unlikely(!n_ptr->bclink.recv_permitted))
return;
tipc_bclink_lock(net);
/* Bail out if tx queue is empty (no clean up is required) */
skb = skb_peek(&tn->bcl->transmq);
if (!skb)
goto exit;
/* Determine which messages need to be acknowledged */
if (acked == INVALID_LINK_SEQ) {
/*
* Contact with specified node has been lost, so need to
* acknowledge sent messages only (if other nodes still exist)
* or both sent and unsent messages (otherwise)
*/
if (tn->bcbase->bcast_nodes.count)
acked = tn->bcl->silent_intv_cnt;
else
acked = tn->bcl->snd_nxt;
} else {
/*
* Bail out if specified sequence number does not correspond
* to a message that has been sent and not yet acknowledged
*/
if (less(acked, buf_seqno(skb)) ||
less(tn->bcl->silent_intv_cnt, acked) ||
less_eq(acked, n_ptr->bclink.acked))
goto exit;
}
/* Skip over packets that node has previously acknowledged */
skb_queue_walk(&tn->bcl->transmq, skb) {
if (more(buf_seqno(skb), n_ptr->bclink.acked))
break;
}
/* Update packets that node is now acknowledging */
skb_queue_walk_from_safe(&tn->bcl->transmq, skb, tmp) {
if (more(buf_seqno(skb), acked))
break;
bcbuf_decr_acks(skb);
bclink_set_last_sent(net);
if (bcbuf_acks(skb) == 0) {
__skb_unlink(skb, &tn->bcl->transmq);
kfree_skb(skb);
released = 1;
}
}
n_ptr->bclink.acked = acked;
/* Try resolving broadcast link congestion, if necessary */
if (unlikely(skb_peek(&tn->bcl->backlogq))) {
tipc_link_push_packets(tn->bcl);
bclink_set_last_sent(net);
}
if (unlikely(released && !skb_queue_empty(&tn->bcl->wakeupq)))
n_ptr->action_flags |= TIPC_WAKEUP_BCAST_USERS;
exit:
tipc_bclink_unlock(net);
}
/**
* tipc_bclink_update_link_state - update broadcast link state
*
* RCU and node lock set
*/
void tipc_bclink_update_link_state(struct tipc_node *n_ptr,
u32 last_sent)
{
struct sk_buff *buf;
struct net *net = n_ptr->net;
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_link *bcl = tn->bcl;
/* Ignore "stale" link state info */
if (less_eq(last_sent, n_ptr->bclink.last_in))
return;
/* Update link synchronization state; quit if in sync */
bclink_update_last_sent(n_ptr, last_sent);
/* This is a good location for statistical profiling */
bcl->stats.queue_sz_counts++;
bcl->stats.accu_queue_sz += skb_queue_len(&bcl->transmq);
if (n_ptr->bclink.last_sent == n_ptr->bclink.last_in)
return;
/* Update out-of-sync state; quit if loss is still unconfirmed */
if ((++n_ptr->bclink.oos_state) == 1) {
if (n_ptr->bclink.deferred_size < (TIPC_MIN_LINK_WIN / 2))
return;
n_ptr->bclink.oos_state++;
}
/* Don't NACK if one has been recently sent (or seen) */
if (n_ptr->bclink.oos_state & 0x1)
return;
/* Send NACK */
buf = tipc_buf_acquire(INT_H_SIZE);
if (buf) {
struct tipc_msg *msg = buf_msg(buf);
struct sk_buff *skb = skb_peek(&n_ptr->bclink.deferdq);
u32 to = skb ? buf_seqno(skb) - 1 : n_ptr->bclink.last_sent;
tipc_msg_init(tn->own_addr, msg, BCAST_PROTOCOL, STATE_MSG,
INT_H_SIZE, n_ptr->addr);
msg_set_non_seq(msg, 1);
msg_set_mc_netid(msg, tn->net_id);
msg_set_bcast_ack(msg, n_ptr->bclink.last_in);
msg_set_bcgap_after(msg, n_ptr->bclink.last_in);
msg_set_bcgap_to(msg, to);
tipc_bclink_lock(net);
tipc_bearer_send(net, MAX_BEARERS, buf, NULL);
tn->bcl->stats.sent_nacks++;
tipc_bclink_unlock(net);
kfree_skb(buf);
n_ptr->bclink.oos_state++;
}
}
void tipc_bclink_sync_state(struct tipc_node *n, struct tipc_msg *hdr)
{
u16 last = msg_last_bcast(hdr);
int mtyp = msg_type(hdr);
if (unlikely(msg_user(hdr) != LINK_PROTOCOL))
return;
if (mtyp == STATE_MSG) {
tipc_bclink_update_link_state(n, last);
return;
}
/* Compatibility: older nodes don't know BCAST_PROTOCOL synchronization,
* and transfer synch info in LINK_PROTOCOL messages.
*/
if (tipc_node_is_up(n))
return;
if ((mtyp != RESET_MSG) && (mtyp != ACTIVATE_MSG))
return;
n->bclink.last_sent = last;
n->bclink.last_in = last;
n->bclink.oos_state = 0;
}
/**
* bclink_peek_nack - monitor retransmission requests sent by other nodes
*
* Delay any upcoming NACK by this node if another node has already
* requested the first message this node is going to ask for.
*/
static void bclink_peek_nack(struct net *net, struct tipc_msg *msg)
{
struct tipc_node *n_ptr = tipc_node_find(net, msg_destnode(msg));
if (unlikely(!n_ptr))
return;
tipc_node_lock(n_ptr);
if (n_ptr->bclink.recv_permitted &&
(n_ptr->bclink.last_in != n_ptr->bclink.last_sent) &&
(n_ptr->bclink.last_in == msg_bcgap_after(msg)))
n_ptr->bclink.oos_state = 2;
tipc_node_unlock(n_ptr);
tipc_node_put(n_ptr);
}
/* tipc_bcbase_xmit - broadcast a packet queue across one or more bearers
*
* Note that number of reachable destinations, as indicated in the dests[]
* array, may transitionally differ from the number of destinations indicated
* in each sent buffer. We can sustain this. Excess destination nodes will
* drop and never acknowledge the unexpected packets, and missing destinations
* will either require retransmission (if they are just about to be added to
* the bearer), or be removed from the buffer's 'ackers' counter (if they
* just went down)
*/
static void tipc_bcbase_xmit(struct net *net, struct sk_buff_head *xmitq)
{
int bearer_id;
struct tipc_bc_base *bb = tipc_bc_base(net);
struct sk_buff *skb, *_skb;
struct sk_buff_head _xmitq;
if (skb_queue_empty(xmitq))
return;
/* The typical case: at least one bearer has links to all nodes */
bearer_id = bb->primary_bearer;
if (bearer_id >= 0) {
tipc_bearer_bc_xmit(net, bearer_id, xmitq);
return;
}
/* We have to transmit across all bearers */
skb_queue_head_init(&_xmitq);
for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
if (!bb->dests[bearer_id])
continue;
skb_queue_walk(xmitq, skb) {
_skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
if (!_skb)
break;
__skb_queue_tail(&_xmitq, _skb);
}
tipc_bearer_bc_xmit(net, bearer_id, &_xmitq);
}
__skb_queue_purge(xmitq);
__skb_queue_purge(&_xmitq);
}
/* tipc_bcast_xmit - deliver buffer chain to all nodes in cluster
* and to identified node local sockets
* @net: the applicable net namespace
* @list: chain of buffers containing message
* Consumes the buffer chain, except when returning -ELINKCONG
* Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
*/
int tipc_bcast_xmit(struct net *net, struct sk_buff_head *list)
{
struct tipc_link *l = tipc_bc_sndlink(net);
struct sk_buff_head xmitq, inputq, rcvq;
int rc = 0;
__skb_queue_head_init(&rcvq);
__skb_queue_head_init(&xmitq);
skb_queue_head_init(&inputq);
/* Prepare message clone for local node */
if (unlikely(!tipc_msg_reassemble(list, &rcvq)))
return -EHOSTUNREACH;
tipc_bcast_lock(net);
if (tipc_link_bc_peers(l))
rc = tipc_link_xmit(l, list, &xmitq);
tipc_bcast_unlock(net);
/* Don't send to local node if adding to link failed */
if (unlikely(rc)) {
__skb_queue_purge(&rcvq);
return rc;
}
/* Broadcast to all nodes, inluding local node */
tipc_bcbase_xmit(net, &xmitq);
tipc_sk_mcast_rcv(net, &rcvq, &inputq);
__skb_queue_purge(list);
return 0;
}
/* tipc_bcast_rcv - receive a broadcast packet, and deliver to rcv link
*
* RCU is locked, no other locks set
*/
int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb)
{
struct tipc_msg *hdr = buf_msg(skb);
struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
struct sk_buff_head xmitq;
int rc;
__skb_queue_head_init(&xmitq);
if (msg_mc_netid(hdr) != tipc_netid(net) || !tipc_link_is_up(l)) {
kfree_skb(skb);
return 0;
}
tipc_bcast_lock(net);
if (msg_user(hdr) == BCAST_PROTOCOL)
rc = tipc_link_bc_nack_rcv(l, skb, &xmitq);
else
rc = tipc_link_rcv(l, skb, NULL);
tipc_bcast_unlock(net);
tipc_bcbase_xmit(net, &xmitq);
/* Any socket wakeup messages ? */
if (!skb_queue_empty(inputq))
tipc_sk_rcv(net, inputq);
return rc;
}
/* tipc_bcast_ack_rcv - receive and handle a broadcast acknowledge
*
* RCU is locked, no other locks set
*/
void tipc_bcast_ack_rcv(struct net *net, struct tipc_link *l, u32 acked)
{
struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
struct sk_buff_head xmitq;
__skb_queue_head_init(&xmitq);
tipc_bcast_lock(net);
tipc_link_bc_ack_rcv(l, acked, &xmitq);
tipc_bcast_unlock(net);
tipc_bcbase_xmit(net, &xmitq);
/* Any socket wakeup messages ? */
if (!skb_queue_empty(inputq))
tipc_sk_rcv(net, inputq);
}
/* tipc_bcast_synch_rcv - check and update rcv link with peer's send state
*
* RCU is locked, no other locks set
*/
void tipc_bcast_sync_rcv(struct net *net, struct tipc_link *l,
struct tipc_msg *hdr)
{
struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
struct sk_buff_head xmitq;
__skb_queue_head_init(&xmitq);
tipc_bcast_lock(net);
if (msg_type(hdr) == STATE_MSG) {
tipc_link_bc_ack_rcv(l, msg_bcast_ack(hdr), &xmitq);
tipc_link_bc_sync_rcv(l, hdr, &xmitq);
} else {
tipc_link_bc_init_rcv(l, hdr);
}
tipc_bcast_unlock(net);
tipc_bcbase_xmit(net, &xmitq);
/* Any socket wakeup messages ? */
if (!skb_queue_empty(inputq))
tipc_sk_rcv(net, inputq);
}
/* tipc_bcast_add_peer - add a peer node to broadcast link and bearer
*
* RCU is locked, node lock is set
*/
void tipc_bcast_add_peer(struct net *net, struct tipc_link *uc_l,
struct sk_buff_head *xmitq)
{
struct tipc_link *snd_l = tipc_bc_sndlink(net);
tipc_bcast_lock(net);
tipc_link_add_bc_peer(snd_l, uc_l, xmitq);
tipc_bcbase_select_primary(net);
tipc_bcast_unlock(net);
}
/* tipc_bcast_remove_peer - remove a peer node from broadcast link and bearer
*
* RCU is locked, node lock is set
*/
void tipc_bcast_remove_peer(struct net *net, struct tipc_link *rcv_l)
{
struct tipc_link *snd_l = tipc_bc_sndlink(net);
struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
struct sk_buff_head xmitq;
__skb_queue_head_init(&xmitq);
tipc_bcast_lock(net);
tipc_link_remove_bc_peer(snd_l, rcv_l, &xmitq);
tipc_bcbase_select_primary(net);
tipc_bcast_unlock(net);
tipc_bcbase_xmit(net, &xmitq);
/* Any socket wakeup messages ? */
if (!skb_queue_empty(inputq))
tipc_sk_rcv(net, inputq);
}
/**
* bclink_accept_pkt - accept an incoming, in-sequence broadcast packet
*
* Called with both sending node's lock and bclink_lock taken.
*/
static void bclink_accept_pkt(struct tipc_node *node, u32 seqno)
{
struct tipc_net *tn = net_generic(node->net, tipc_net_id);
bclink_update_last_sent(node, seqno);
node->bclink.last_in = seqno;
node->bclink.oos_state = 0;
tn->bcl->stats.recv_info++;
/*
* Unicast an ACK periodically, ensuring that
* all nodes in the cluster don't ACK at the same time
*/
if (((seqno - tn->own_addr) % TIPC_MIN_LINK_WIN) == 0) {
tipc_link_proto_xmit(node_active_link(node, node->addr),
STATE_MSG, 0, 0, 0, 0);
tn->bcl->stats.sent_acks++;
}
}
/**
* tipc_bclink_rcv - receive a broadcast packet, and deliver upwards
*
* RCU is locked, no other locks set
*/
void tipc_bclink_rcv(struct net *net, struct sk_buff *buf)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_link *bcl = tn->bcl;
struct tipc_msg *msg = buf_msg(buf);
struct tipc_node *node;
u32 next_in;
u32 seqno;
int deferred = 0;
int pos = 0;
struct sk_buff *iskb;
struct sk_buff_head *arrvq, *inputq;
/* Screen out unwanted broadcast messages */
if (msg_mc_netid(msg) != tn->net_id)
goto exit;
node = tipc_node_find(net, msg_prevnode(msg));
if (unlikely(!node))
goto exit;
tipc_node_lock(node);
if (unlikely(!node->bclink.recv_permitted))
goto unlock;
/* Handle broadcast protocol message */
if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) {
if (msg_type(msg) != STATE_MSG)
goto unlock;
if (msg_destnode(msg) == tn->own_addr) {
tipc_bclink_acknowledge(node, msg_bcast_ack(msg));
tipc_bclink_lock(net);
bcl->stats.recv_nacks++;
tn->bcbase->retransmit_to = node;
bclink_retransmit_pkt(tn, msg_bcgap_after(msg),
msg_bcgap_to(msg));
tipc_bclink_unlock(net);
tipc_node_unlock(node);
} else {
tipc_node_unlock(node);
bclink_peek_nack(net, msg);
}
tipc_node_put(node);
goto exit;
}
/* Handle in-sequence broadcast message */
seqno = msg_seqno(msg);
next_in = mod(node->bclink.last_in + 1);
arrvq = &tn->bcbase->arrvq;
inputq = &tn->bcbase->inputq;
if (likely(seqno == next_in)) {
receive:
/* Deliver message to destination */
if (likely(msg_isdata(msg))) {
tipc_bclink_lock(net);
bclink_accept_pkt(node, seqno);
spin_lock_bh(&inputq->lock);
__skb_queue_tail(arrvq, buf);
spin_unlock_bh(&inputq->lock);
node->action_flags |= TIPC_BCAST_MSG_EVT;
tipc_bclink_unlock(net);
tipc_node_unlock(node);
} else if (msg_user(msg) == MSG_BUNDLER) {
tipc_bclink_lock(net);
bclink_accept_pkt(node, seqno);
bcl->stats.recv_bundles++;
bcl->stats.recv_bundled += msg_msgcnt(msg);
pos = 0;
while (tipc_msg_extract(buf, &iskb, &pos)) {
spin_lock_bh(&inputq->lock);
__skb_queue_tail(arrvq, iskb);
spin_unlock_bh(&inputq->lock);
}
node->action_flags |= TIPC_BCAST_MSG_EVT;
tipc_bclink_unlock(net);
tipc_node_unlock(node);
} else if (msg_user(msg) == MSG_FRAGMENTER) {
tipc_bclink_lock(net);
bclink_accept_pkt(node, seqno);
tipc_buf_append(&node->bclink.reasm_buf, &buf);
if (unlikely(!buf && !node->bclink.reasm_buf)) {
tipc_bclink_unlock(net);
goto unlock;
}
bcl->stats.recv_fragments++;
if (buf) {
bcl->stats.recv_fragmented++;
msg = buf_msg(buf);
tipc_bclink_unlock(net);
goto receive;
}
tipc_bclink_unlock(net);
tipc_node_unlock(node);
} else {
tipc_bclink_lock(net);
bclink_accept_pkt(node, seqno);
tipc_bclink_unlock(net);
tipc_node_unlock(node);
kfree_skb(buf);
}
buf = NULL;
/* Determine new synchronization state */
tipc_node_lock(node);
if (unlikely(!tipc_node_is_up(node)))
goto unlock;
if (node->bclink.last_in == node->bclink.last_sent)
goto unlock;
if (skb_queue_empty(&node->bclink.deferdq)) {
node->bclink.oos_state = 1;
goto unlock;
}
msg = buf_msg(skb_peek(&node->bclink.deferdq));
seqno = msg_seqno(msg);
next_in = mod(next_in + 1);
if (seqno != next_in)
goto unlock;
/* Take in-sequence message from deferred queue & deliver it */
buf = __skb_dequeue(&node->bclink.deferdq);
goto receive;
}
/* Handle out-of-sequence broadcast message */
if (less(next_in, seqno)) {
deferred = tipc_link_defer_pkt(&node->bclink.deferdq,
buf);
bclink_update_last_sent(node, seqno);
buf = NULL;
}
tipc_bclink_lock(net);
if (deferred)
bcl->stats.deferred_recv++;
else
bcl->stats.duplicates++;
tipc_bclink_unlock(net);
unlock:
tipc_node_unlock(node);
tipc_node_put(node);
exit:
kfree_skb(buf);
}
u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr)
{
return (n_ptr->bclink.recv_permitted &&
(tipc_bclink_get_last_sent(n_ptr->net) != n_ptr->bclink.acked));
}
/**
* tipc_bcbearer_send - send a packet through the broadcast pseudo-bearer
*
* Send packet over as many bearers as necessary to reach all nodes
* that have joined the broadcast link.
*
* Returns 0 (packet sent successfully) under all circumstances,
* since the broadcast link's pseudo-bearer never blocks
*/
static int tipc_bcbearer_send(struct net *net, struct sk_buff *buf,
struct tipc_bearer *unused1,
struct tipc_media_addr *unused2)
{
int bp_index;
struct tipc_msg *msg = buf_msg(buf);
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bcbearer *bcbearer = tn->bcbearer;
struct tipc_bc_base *bclink = tn->bcbase;
/* Prepare broadcast link message for reliable transmission,
* if first time trying to send it;
* preparation is skipped for broadcast link protocol messages
* since they are sent in an unreliable manner and don't need it
*/
if (likely(!msg_non_seq(buf_msg(buf)))) {
bcbuf_set_acks(buf, bclink->bcast_nodes.count);
msg_set_non_seq(msg, 1);
msg_set_mc_netid(msg, tn->net_id);
tn->bcl->stats.sent_info++;
if (WARN_ON(!bclink->bcast_nodes.count)) {
dump_stack();
return 0;
}
}
msg_set_mc_netid(msg, tn->net_id);
/* Send buffer over bearers until all targets reached */
bcbearer->remains = bclink->bcast_nodes;
for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) {
struct tipc_bearer *p = bcbearer->bpairs[bp_index].primary;
struct tipc_bearer *s = bcbearer->bpairs[bp_index].secondary;
struct tipc_bearer *bp[2] = {p, s};
struct tipc_bearer *b = bp[msg_link_selector(msg)];
struct sk_buff *tbuf;
if (!p)
break; /* No more bearers to try */
if (!b)
b = p;
tipc_nmap_diff(&bcbearer->remains, &b->nodes,
&bcbearer->remains_new);
if (bcbearer->remains_new.count == bcbearer->remains.count)
continue; /* Nothing added by bearer pair */
if (bp_index == 0) {
/* Use original buffer for first bearer */
tipc_bearer_send(net, b->identity, buf, &b->bcast_addr);
} else {
/* Avoid concurrent buffer access */
tbuf = pskb_copy_for_clone(buf, GFP_ATOMIC);
if (!tbuf)
break;
tipc_bearer_send(net, b->identity, tbuf,
&b->bcast_addr);
kfree_skb(tbuf); /* Bearer keeps a clone */
}
if (bcbearer->remains_new.count == 0)
break; /* All targets reached */
bcbearer->remains = bcbearer->remains_new;
}
return 0;
}
/**
* tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer
*/
void tipc_bcbearer_sort(struct net *net, struct tipc_node_map *nm_ptr,
u32 node, bool action)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bcbearer *bcbearer = tn->bcbearer;
struct tipc_bcbearer_pair *bp_temp = bcbearer->bpairs_temp;
struct tipc_bcbearer_pair *bp_curr;
struct tipc_bearer *b;
int b_index;
int pri;
tipc_bclink_lock(net);
if (action)
tipc_nmap_add(nm_ptr, node);
else
tipc_nmap_remove(nm_ptr, node);
/* Group bearers by priority (can assume max of two per priority) */
memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp));
rcu_read_lock();
for (b_index = 0; b_index < MAX_BEARERS; b_index++) {
b = rcu_dereference_rtnl(tn->bearer_list[b_index]);
if (!b || !b->nodes.count)
continue;
if (!bp_temp[b->priority].primary)
bp_temp[b->priority].primary = b;
else
bp_temp[b->priority].secondary = b;
}
rcu_read_unlock();
/* Create array of bearer pairs for broadcasting */
bp_curr = bcbearer->bpairs;
memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs));
for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) {
if (!bp_temp[pri].primary)
continue;
bp_curr->primary = bp_temp[pri].primary;
if (bp_temp[pri].secondary) {
if (tipc_nmap_equal(&bp_temp[pri].primary->nodes,
&bp_temp[pri].secondary->nodes)) {
bp_curr->secondary = bp_temp[pri].secondary;
} else {
bp_curr++;
bp_curr->primary = bp_temp[pri].secondary;
}
}
bp_curr++;
}
tipc_bclink_unlock(net);
}
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_info},
{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_info},
{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(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);
struct tipc_link *bcl = tn->bcl;
if (!bcl)
return 0;
tipc_bclink_lock(net);
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
NLM_F_MULTI, TIPC_NL_LINK_GET);
if (!hdr)
return -EMSGSIZE;
attrs = nla_nest_start(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, bcl->rcv_nxt))
goto attr_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt))
goto attr_msg_full;
prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
if (!prop)
goto attr_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window))
goto prop_msg_full;
nla_nest_end(msg->skb, prop);
err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
if (err)
goto attr_msg_full;
tipc_bclink_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_bclink_unlock(net);
genlmsg_cancel(msg->skb, hdr);
return -EMSGSIZE;
}
int tipc_bclink_reset_stats(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_link *bcl = tn->bcl;
if (!bcl)
return -ENOPROTOOPT;
tipc_bclink_lock(net);
memset(&bcl->stats, 0, sizeof(bcl->stats));
tipc_bclink_unlock(net);
return 0;
}
int tipc_bclink_set_queue_limits(struct net *net, u32 limit)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_link *bcl = tn->bcl;
if (!bcl)
return -ENOPROTOOPT;
if (limit < BCLINK_WIN_MIN)
limit = BCLINK_WIN_MIN;
if (limit > TIPC_MAX_LINK_WIN)
return -EINVAL;
tipc_bclink_lock(net);
tipc_link_set_queue_limits(bcl, limit);
tipc_bclink_unlock(net);
return 0;
}
int tipc_nl_bc_link_set(struct net *net, struct nlattr *attrs[])
{
int err;
u32 win;
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
if (!attrs[TIPC_NLA_LINK_PROP])
return -EINVAL;
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
if (err)
return err;
if (!props[TIPC_NLA_PROP_WIN])
return -EOPNOTSUPP;
win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
return tipc_bclink_set_queue_limits(net, win);
}
int tipc_bcast_init(struct net *net)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_bcbearer *bcb = NULL;
struct tipc_bc_base *bb = NULL;
struct tipc_link *l = NULL;
bcb = kzalloc(sizeof(*bcb), GFP_ATOMIC);
if (!bcb)
goto enomem;
tn->bcbearer = bcb;
bcb->bearer.window = BCLINK_WIN_DEFAULT;
bcb->bearer.mtu = MAX_PKT_DEFAULT_MCAST;
bcb->bearer.identity = MAX_BEARERS;
bcb->bearer.media = &bcb->media;
bcb->media.send_msg = tipc_bcbearer_send;
sprintf(bcb->media.name, "tipc-broadcast");
strcpy(bcb->bearer.name, bcb->media.name);
bb = kzalloc(sizeof(*bb), GFP_ATOMIC);
if (!bb)
goto enomem;
tn->bcbase = bb;
__skb_queue_head_init(&bb->arrvq);
spin_lock_init(&tipc_net(net)->bclock);
bb->node.net = net;
if (!tipc_link_bc_create(&bb->node, 0, 0,
MAX_PKT_DEFAULT_MCAST,
BCLINK_WIN_DEFAULT,
0,
&bb->inputq,
&bb->namedq,
NULL,
&l))
goto enomem;
bb->link = l;
tn->bcl = l;
rcu_assign_pointer(tn->bearer_list[MAX_BEARERS], &bcb->bearer);
return 0;
enomem:
kfree(bcb);
kfree(bb);
kfree(l);
return -ENOMEM;
}
void tipc_bcast_reinit(struct net *net)
{
struct tipc_bc_base *b = tipc_bc_base(net);
msg_set_prevnode(b->link->pmsg, tipc_own_addr(net));
}
void tipc_bcast_stop(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
tipc_bclink_lock(net);
tipc_link_purge_queues(tn->bcl);
tipc_bclink_unlock(net);
RCU_INIT_POINTER(tn->bearer_list[BCBEARER], NULL);
synchronize_net();
kfree(tn->bcbearer);
kfree(tn->bcbase);
kfree(tn->bcl);
}
/**
* tipc_nmap_add - add a node to a node map
*/
static void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node)
{
int n = tipc_node(node);
int w = n / WSIZE;
u32 mask = (1 << (n % WSIZE));
if ((nm_ptr->map[w] & mask) == 0) {
nm_ptr->count++;
nm_ptr->map[w] |= mask;
}
}
/**
* tipc_nmap_remove - remove a node from a node map
*/
static void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node)
{
int n = tipc_node(node);
int w = n / WSIZE;
u32 mask = (1 << (n % WSIZE));
if ((nm_ptr->map[w] & mask) != 0) {
nm_ptr->map[w] &= ~mask;
nm_ptr->count--;
}
}
/**
* tipc_nmap_diff - find differences between node maps
* @nm_a: input node map A
* @nm_b: input node map B
* @nm_diff: output node map A-B (i.e. nodes of A that are not in B)
*/
static void tipc_nmap_diff(struct tipc_node_map *nm_a,
struct tipc_node_map *nm_b,
struct tipc_node_map *nm_diff)
{
int stop = ARRAY_SIZE(nm_a->map);
int w;
int b;
u32 map;
memset(nm_diff, 0, sizeof(*nm_diff));
for (w = 0; w < stop; w++) {
map = nm_a->map[w] ^ (nm_a->map[w] & nm_b->map[w]);
nm_diff->map[w] = map;
if (map != 0) {
for (b = 0 ; b < WSIZE; b++) {
if (map & (1 << b))
nm_diff->count++;
}
}
}
}
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