tipc: make tipc broadcast link support net namespace

TIPC broadcast link is statically established and its relevant states
are maintained with the global variables: "bcbearer", "bclink" and
"bcl". Allowing different namespace to own different broadcast link
instances, these variables must be moved to tipc_net structure and
broadcast link instances would be allocated and initialized when
namespace is created.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Tested-by: Tero Aho <Tero.Aho@coriant.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 140 insertions, 157 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index e7c538304595..bc58097ebad2 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -35,77 +35,14 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "core.h"
-#include "link.h"
 #include "socket.h"
 #include "msg.h"
 #include "bcast.h"
 #include "name_distr.h"
+#include "core.h"
 
 #define MAX_PKT_DEFAULT_MCAST   1500    /* bcast link max packet size (fixed) */
 #define BCLINK_WIN_DEFAULT      20      /* bcast link window size (default) */
-#define BCBEARER                MAX_BEARERS
-
-/**
- * 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;
-};
-
-/**
- * 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 "bclink_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_bclink - link used for broadcast messages
- * @lock: spinlock governing access to structure
- * @link: (non-standard) broadcast link structure
- * @node: (non-standard) node structure representing b'cast link's peer node
- * @flags: represent bclink states
- * @bcast_nodes: map of broadcast-capable nodes
- * @retransmit_to: node that most recently requested a retransmit
- *
- * Handles sequence numbering, fragmentation, bundling, etc.
- */
-struct tipc_bclink {
-        spinlock_t lock;
-        struct tipc_link link;
-        struct tipc_node node;
-        unsigned int flags;
-        struct tipc_node_map bcast_nodes;
-        struct tipc_node *retransmit_to;
-};
-
-static struct tipc_bcbearer *bcbearer;
-static struct tipc_bclink *bclink;
-static struct tipc_link *bcl;
 
 const char tipc_bclink_name[] = "broadcast-link";
 
@@ -115,25 +52,28 @@ static void tipc_nmap_diff(struct tipc_node_map *nm_a,
 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(void)
+static void tipc_bclink_lock(struct net *net)
 {
-        spin_lock_bh(&bclink->lock);
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+        spin_lock_bh(&tn->bclink->lock);
 }
 
-static void tipc_bclink_unlock(void)
+static void tipc_bclink_unlock(struct net *net)
 {
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
         struct tipc_node *node = NULL;
 
-        if (likely(!bclink->flags)) {
-                spin_unlock_bh(&bclink->lock);
+        if (likely(!tn->bclink->flags)) {
+                spin_unlock_bh(&tn->bclink->lock);
                 return;
         }
 
-        if (bclink->flags & TIPC_BCLINK_RESET) {
-                bclink->flags &= ~TIPC_BCLINK_RESET;
-                node = tipc_bclink_retransmit_to();
+        if (tn->bclink->flags & TIPC_BCLINK_RESET) {
+                tn->bclink->flags &= ~TIPC_BCLINK_RESET;
+                node = tipc_bclink_retransmit_to(net);
         }
-        spin_unlock_bh(&bclink->lock);
+        spin_unlock_bh(&tn->bclink->lock);
 
         if (node)
                 tipc_link_reset_all(node);
@@ -144,9 +84,11 @@ uint  tipc_bclink_get_mtu(void)
         return MAX_PKT_DEFAULT_MCAST;
 }
 
-void tipc_bclink_set_flags(unsigned int flags)
+void tipc_bclink_set_flags(struct net *net, unsigned int flags)
 {
-        bclink->flags |= flags;
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+        tn->bclink->flags |= flags;
 }
 
 static u32 bcbuf_acks(struct sk_buff *buf)
@@ -164,31 +106,40 @@ static void bcbuf_decr_acks(struct sk_buff *buf)
         bcbuf_set_acks(buf, bcbuf_acks(buf) - 1);
 }
 
-void tipc_bclink_add_node(u32 addr)
+void tipc_bclink_add_node(struct net *net, u32 addr)
 {
-        tipc_bclink_lock();
-        tipc_nmap_add(&bclink->bcast_nodes, addr);
-        tipc_bclink_unlock();
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+        tipc_bclink_lock(net);
+        tipc_nmap_add(&tn->bclink->bcast_nodes, addr);
+        tipc_bclink_unlock(net);
 }
 
-void tipc_bclink_remove_node(u32 addr)
+void tipc_bclink_remove_node(struct net *net, u32 addr)
 {
-        tipc_bclink_lock();
-        tipc_nmap_remove(&bclink->bcast_nodes, addr);
-        tipc_bclink_unlock();
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+        tipc_bclink_lock(net);
+        tipc_nmap_remove(&tn->bclink->bcast_nodes, addr);
+        tipc_bclink_unlock(net);
 }
 
-static void bclink_set_last_sent(void)
+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;
+
         if (bcl->next_out)
                 bcl->fsm_msg_cnt = mod(buf_seqno(bcl->next_out) - 1);
         else
                 bcl->fsm_msg_cnt = mod(bcl->next_out_no - 1);
 }
 
-u32 tipc_bclink_get_last_sent(void)
+u32 tipc_bclink_get_last_sent(struct net *net)
 {
-        return bcl->fsm_msg_cnt;
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+        return tn->bcl->fsm_msg_cnt;
 }
 
 static void bclink_update_last_sent(struct tipc_node *node, u32 seqno)
@@ -203,9 +154,11 @@ static void bclink_update_last_sent(struct tipc_node *node, u32 seqno)
  *
  * Called with bclink_lock locked
  */
-struct tipc_node *tipc_bclink_retransmit_to(void)
+struct tipc_node *tipc_bclink_retransmit_to(struct net *net)
 {
-        return bclink->retransmit_to;
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+        return tn->bclink->retransmit_to;
 }
 
 /**
@@ -215,9 +168,10 @@ struct tipc_node *tipc_bclink_retransmit_to(void)
  *
  * Called with bclink_lock locked
  */
-static void bclink_retransmit_pkt(u32 after, u32 to)
+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->outqueue, skb) {
                 if (more(buf_seqno(skb), after)) {
@@ -234,9 +188,10 @@ static void bclink_retransmit_pkt(u32 after, u32 to)
  */
 void tipc_bclink_wakeup_users(struct net *net)
 {
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
         struct sk_buff *skb;
 
-        while ((skb = skb_dequeue(&bclink->link.waiting_sks)))
+        while ((skb = skb_dequeue(&tn->bclink->link.waiting_sks)))
                 tipc_sk_rcv(net, skb);
 }
 
@@ -252,10 +207,12 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
         struct sk_buff *skb, *tmp;
         struct sk_buff *next;
         unsigned int released = 0;
+        struct net *net = n_ptr->net;
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
 
-        tipc_bclink_lock();
+        tipc_bclink_lock(net);
         /* Bail out if tx queue is empty (no clean up is required) */
-        skb = skb_peek(&bcl->outqueue);
+        skb = skb_peek(&tn->bcl->outqueue);
         if (!skb)
                 goto exit;
 
@@ -266,43 +223,43 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
                  * acknowledge sent messages only (if other nodes still exist)
                  * or both sent and unsent messages (otherwise)
                  */
-                if (bclink->bcast_nodes.count)
-                        acked = bcl->fsm_msg_cnt;
+                if (tn->bclink->bcast_nodes.count)
+                        acked = tn->bcl->fsm_msg_cnt;
                 else
-                        acked = bcl->next_out_no;
+                        acked = tn->bcl->next_out_no;
         } 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(bcl->fsm_msg_cnt, acked) ||
+                    less(tn->bcl->fsm_msg_cnt, acked) ||
                     less_eq(acked, n_ptr->bclink.acked))
                         goto exit;
         }
 
         /* Skip over packets that node has previously acknowledged */
-        skb_queue_walk(&bcl->outqueue, skb) {
+        skb_queue_walk(&tn->bcl->outqueue, skb) {
                 if (more(buf_seqno(skb), n_ptr->bclink.acked))
                         break;
         }
 
         /* Update packets that node is now acknowledging */
-        skb_queue_walk_from_safe(&bcl->outqueue, skb, tmp) {
+        skb_queue_walk_from_safe(&tn->bcl->outqueue, skb, tmp) {
                 if (more(buf_seqno(skb), acked))
                         break;
 
-                next = tipc_skb_queue_next(&bcl->outqueue, skb);
-                if (skb != bcl->next_out) {
+                next = tipc_skb_queue_next(&tn->bcl->outqueue, skb);
+                if (skb != tn->bcl->next_out) {
                         bcbuf_decr_acks(skb);
                 } else {
                         bcbuf_set_acks(skb, 0);
-                        bcl->next_out = next;
-                        bclink_set_last_sent();
+                        tn->bcl->next_out = next;
+                        bclink_set_last_sent(net);
                 }
 
                 if (bcbuf_acks(skb) == 0) {
-                        __skb_unlink(skb, &bcl->outqueue);
+                        __skb_unlink(skb, &tn->bcl->outqueue);
                         kfree_skb(skb);
                         released = 1;
                 }
@@ -310,15 +267,15 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
         n_ptr->bclink.acked = acked;
 
         /* Try resolving broadcast link congestion, if necessary */
-        if (unlikely(bcl->next_out)) {
-                tipc_link_push_packets(bcl);
-                bclink_set_last_sent();
+        if (unlikely(tn->bcl->next_out)) {
+                tipc_link_push_packets(tn->bcl);
+                bclink_set_last_sent(net);
         }
-        if (unlikely(released && !skb_queue_empty(&bcl->waiting_sks)))
+        if (unlikely(released && !skb_queue_empty(&tn->bcl->waiting_sks)))
                 n_ptr->action_flags |= TIPC_WAKEUP_BCAST_USERS;
 
 exit:
-        tipc_bclink_unlock();
+        tipc_bclink_unlock(net);
 }
 
 /**
@@ -368,10 +325,10 @@ void tipc_bclink_update_link_state(struct net *net, struct tipc_node *n_ptr,
                 msg_set_bcgap_after(msg, n_ptr->bclink.last_in);
                 msg_set_bcgap_to(msg, to);
 
-                tipc_bclink_lock();
+                tipc_bclink_lock(net);
                 tipc_bearer_send(net, MAX_BEARERS, buf, NULL);
-                bcl->stats.sent_nacks++;
-                tipc_bclink_unlock();
+                tn->bcl->stats.sent_nacks++;
+                tipc_bclink_unlock(net);
                 kfree_skb(buf);
 
                 n_ptr->bclink.oos_state++;
@@ -410,6 +367,9 @@ static void bclink_peek_nack(struct net *net, struct tipc_msg *msg)
  */
 int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list)
 {
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
+        struct tipc_link *bcl = tn->bcl;
+        struct tipc_bclink *bclink = tn->bclink;
         int rc = 0;
         int bc = 0;
         struct sk_buff *skb;
@@ -423,19 +383,19 @@ int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list)
 
         /* Broadcast to all other nodes */
         if (likely(bclink)) {
-                tipc_bclink_lock();
+                tipc_bclink_lock(net);
                 if (likely(bclink->bcast_nodes.count)) {
                         rc = __tipc_link_xmit(net, bcl, list);
                         if (likely(!rc)) {
                                 u32 len = skb_queue_len(&bcl->outqueue);
 
-                                bclink_set_last_sent();
+                                bclink_set_last_sent(net);
                                 bcl->stats.queue_sz_counts++;
                                 bcl->stats.accu_queue_sz += len;
                         }
                         bc = 1;
                 }
-                tipc_bclink_unlock();
+                tipc_bclink_unlock(net);
         }
 
         if (unlikely(!bc))
@@ -457,10 +417,12 @@ int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list)
  */
 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;
-        bcl->stats.recv_info++;
+        tn->bcl->stats.recv_info++;
 
         /*
          * Unicast an ACK periodically, ensuring that
@@ -469,7 +431,7 @@ static void bclink_accept_pkt(struct tipc_node *node, u32 seqno)
         if (((seqno - tipc_own_addr) % TIPC_MIN_LINK_WIN) == 0) {
                 tipc_link_proto_xmit(node->active_links[node->addr & 1],
                                      STATE_MSG, 0, 0, 0, 0, 0);
-                bcl->stats.sent_acks++;
+                tn->bcl->stats.sent_acks++;
         }
 }
 
@@ -481,6 +443,7 @@ static void bclink_accept_pkt(struct tipc_node *node, u32 seqno)
 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;
@@ -506,12 +469,12 @@ void tipc_bclink_rcv(struct net *net, struct sk_buff *buf)
                 if (msg_destnode(msg) == tipc_own_addr) {
                         tipc_bclink_acknowledge(node, msg_bcast_ack(msg));
                         tipc_node_unlock(node);
-                        tipc_bclink_lock();
+                        tipc_bclink_lock(net);
                         bcl->stats.recv_nacks++;
-                        bclink->retransmit_to = node;
-                        bclink_retransmit_pkt(msg_bcgap_after(msg),
+                        tn->bclink->retransmit_to = node;
+                        bclink_retransmit_pkt(tn, msg_bcgap_after(msg),
                                               msg_bcgap_to(msg));
-                        tipc_bclink_unlock();
+                        tipc_bclink_unlock(net);
                 } else {
                         tipc_node_unlock(node);
                         bclink_peek_nack(net, msg);
@@ -527,47 +490,47 @@ void tipc_bclink_rcv(struct net *net, struct sk_buff *buf)
 receive:
                 /* Deliver message to destination */
                 if (likely(msg_isdata(msg))) {
-                        tipc_bclink_lock();
+                        tipc_bclink_lock(net);
                         bclink_accept_pkt(node, seqno);
-                        tipc_bclink_unlock();
+                        tipc_bclink_unlock(net);
                         tipc_node_unlock(node);
                         if (likely(msg_mcast(msg)))
                                 tipc_sk_mcast_rcv(net, buf);
                         else
                                 kfree_skb(buf);
                 } else if (msg_user(msg) == MSG_BUNDLER) {
-                        tipc_bclink_lock();
+                        tipc_bclink_lock(net);
                         bclink_accept_pkt(node, seqno);
                         bcl->stats.recv_bundles++;
                         bcl->stats.recv_bundled += msg_msgcnt(msg);
-                        tipc_bclink_unlock();
+                        tipc_bclink_unlock(net);
                         tipc_node_unlock(node);
                         tipc_link_bundle_rcv(net, buf);
                 } else if (msg_user(msg) == MSG_FRAGMENTER) {
                         tipc_buf_append(&node->bclink.reasm_buf, &buf);
                         if (unlikely(!buf && !node->bclink.reasm_buf))
                                 goto unlock;
-                        tipc_bclink_lock();
+                        tipc_bclink_lock(net);
                         bclink_accept_pkt(node, seqno);
                         bcl->stats.recv_fragments++;
                         if (buf) {
                                 bcl->stats.recv_fragmented++;
                                 msg = buf_msg(buf);
-                                tipc_bclink_unlock();
+                                tipc_bclink_unlock(net);
                                 goto receive;
                         }
-                        tipc_bclink_unlock();
+                        tipc_bclink_unlock(net);
                         tipc_node_unlock(node);
                 } else if (msg_user(msg) == NAME_DISTRIBUTOR) {
-                        tipc_bclink_lock();
+                        tipc_bclink_lock(net);
                         bclink_accept_pkt(node, seqno);
-                        tipc_bclink_unlock();
+                        tipc_bclink_unlock(net);
                         tipc_node_unlock(node);
                         tipc_named_rcv(net, buf);
                 } else {
-                        tipc_bclink_lock();
+                        tipc_bclink_lock(net);
                         bclink_accept_pkt(node, seqno);
-                        tipc_bclink_unlock();
+                        tipc_bclink_unlock(net);
                         tipc_node_unlock(node);
                         kfree_skb(buf);
                 }
@@ -605,14 +568,14 @@ receive:
                 buf = NULL;
         }
 
-        tipc_bclink_lock();
+        tipc_bclink_lock(net);
 
         if (deferred)
                 bcl->stats.deferred_recv++;
         else
                 bcl->stats.duplicates++;
 
-        tipc_bclink_unlock();
+        tipc_bclink_unlock(net);
 
 unlock:
         tipc_node_unlock(node);
@@ -623,7 +586,7 @@ exit:
 u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr)
 {
         return (n_ptr->bclink.recv_permitted &&
-                (tipc_bclink_get_last_sent() != n_ptr->bclink.acked));
+                (tipc_bclink_get_last_sent(n_ptr->net) != n_ptr->bclink.acked));
 }
 
 
@@ -636,13 +599,15 @@ u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr)
  * Returns 0 (packet sent successfully) under all circumstances,
  * since the broadcast link's pseudo-bearer never blocks
  */
-static int tipc_bcbearer_send(struct sk_buff *buf, struct tipc_bearer *unused1,
+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 net *net = sock_net(buf->sk);
         struct tipc_net *tn = net_generic(net, tipc_net_id);
+        struct tipc_bcbearer *bcbearer = tn->bcbearer;
+        struct tipc_bclink *bclink = tn->bclink;
 
         /* Prepare broadcast link message for reliable transmission,
          * if first time trying to send it;
@@ -653,7 +618,7 @@ static int tipc_bcbearer_send(struct sk_buff *buf, struct tipc_bearer *unused1,
                 bcbuf_set_acks(buf, bclink->bcast_nodes.count);
                 msg_set_non_seq(msg, 1);
                 msg_set_mc_netid(msg, tn->net_id);
-                bcl->stats.sent_info++;
+                tn->bcl->stats.sent_info++;
 
                 if (WARN_ON(!bclink->bcast_nodes.count)) {
                         dump_stack();
@@ -708,13 +673,14 @@ 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();
+        tipc_bclink_lock(net);
 
         if (action)
                 tipc_nmap_add(nm_ptr, node);
@@ -761,7 +727,7 @@ void tipc_bcbearer_sort(struct net *net, struct tipc_node_map *nm_ptr,
                 bp_curr++;
         }
 
-        tipc_bclink_unlock();
+        tipc_bclink_unlock(net);
 }
 
 static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb,
@@ -815,17 +781,19 @@ msg_full:
         return -EMSGSIZE;
 }
 
-int tipc_nl_add_bc_link(struct tipc_nl_msg *msg)
+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();
+        tipc_bclink_lock(net);
 
         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family,
                           NLM_F_MULTI, TIPC_NL_LINK_GET);
@@ -860,7 +828,7 @@ int tipc_nl_add_bc_link(struct tipc_nl_msg *msg)
         if (err)
                 goto attr_msg_full;
 
-        tipc_bclink_unlock();
+        tipc_bclink_unlock(net);
         nla_nest_end(msg->skb, attrs);
         genlmsg_end(msg->skb, hdr);
 
@@ -871,21 +839,23 @@ prop_msg_full:
 attr_msg_full:
         nla_nest_cancel(msg->skb, attrs);
 msg_full:
-        tipc_bclink_unlock();
+        tipc_bclink_unlock(net);
         genlmsg_cancel(msg->skb, hdr);
 
         return -EMSGSIZE;
 }
 
-int tipc_bclink_stats(char *buf, const u32 buf_size)
+int tipc_bclink_stats(struct net *net, char *buf, const u32 buf_size)
 {
         int ret;
         struct tipc_stats *s;
+        struct tipc_net *tn = net_generic(net, tipc_net_id);
+        struct tipc_link *bcl = tn->bcl;
 
         if (!bcl)
                 return 0;
 
-        tipc_bclink_lock();
+        tipc_bclink_lock(net);
 
         s = &bcl->stats;
 
@@ -914,37 +884,46 @@ int tipc_bclink_stats(char *buf, const u32 buf_size)
                              s->queue_sz_counts ?
                              (s->accu_queue_sz / s->queue_sz_counts) : 0);
 
-        tipc_bclink_unlock();
+        tipc_bclink_unlock(net);
         return ret;
 }
 
-int tipc_bclink_reset_stats(void)
+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();
+        tipc_bclink_lock(net);
         memset(&bcl->stats, 0, sizeof(bcl->stats));
-        tipc_bclink_unlock();
+        tipc_bclink_unlock(net);
         return 0;
 }
 
-int tipc_bclink_set_queue_limits(u32 limit)
+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 < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN))
                 return -EINVAL;
 
-        tipc_bclink_lock();
+        tipc_bclink_lock(net);
         tipc_link_set_queue_limits(bcl, limit);
-        tipc_bclink_unlock();
+        tipc_bclink_unlock(net);
         return 0;
 }
 
 int tipc_bclink_init(struct net *net)
 {
         struct tipc_net *tn = net_generic(net, tipc_net_id);
+        struct tipc_bcbearer *bcbearer;
+        struct tipc_bclink *bclink;
+        struct tipc_link *bcl;
 
         bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC);
         if (!bcbearer)
@@ -969,12 +948,16 @@ int tipc_bclink_init(struct net *net)
         spin_lock_init(&bclink->node.lock);
         __skb_queue_head_init(&bclink->node.waiting_sks);
         bcl->owner = &bclink->node;
+        bcl->owner->net = net;
         bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
         tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
         bcl->bearer_id = MAX_BEARERS;
         rcu_assign_pointer(tn->bearer_list[MAX_BEARERS], &bcbearer->bearer);
         bcl->state = WORKING_WORKING;
         strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);
+        tn->bcbearer = bcbearer;
+        tn->bclink = bclink;
+        tn->bcl = bcl;
         return 0;
 }
 
@@ -982,14 +965,14 @@ void tipc_bclink_stop(struct net *net)
 {
         struct tipc_net *tn = net_generic(net, tipc_net_id);
 
-        tipc_bclink_lock();
-        tipc_link_purge_queues(bcl);
-        tipc_bclink_unlock();
+        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(bcbearer);
-        kfree(bclink);
+        kfree(tn->bcbearer);
+        kfree(tn->bclink);
 }
 
 /**