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Diffstat (limited to 'net/tipc/bearer.c')
-rw-r--r--net/tipc/bearer.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index a809c0ec8d15..0214aa1c4427 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -389,6 +389,11 @@ int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
dev_put(dev);
return -EINVAL;
}
+ if (dev == net->loopback_dev) {
+ dev_put(dev);
+ pr_info("Enabling <%s> not permitted\n", b->name);
+ return -EINVAL;
+ }
/* Autoconfigure own node identity if needed */
if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
@@ -674,6 +679,65 @@ void tipc_bearer_stop(struct net *net)
}
}
+void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
+{
+ struct net_device *dev = net->loopback_dev;
+ struct sk_buff *skb, *_skb;
+ int exp;
+
+ skb_queue_walk(pkts, _skb) {
+ skb = pskb_copy(_skb, GFP_ATOMIC);
+ if (!skb)
+ continue;
+
+ exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
+ if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
+ kfree_skb(skb);
+ continue;
+ }
+
+ skb_reset_network_header(skb);
+ dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
+ dev->dev_addr, skb->len);
+ skb->dev = dev;
+ skb->pkt_type = PACKET_HOST;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ skb->protocol = eth_type_trans(skb, dev);
+ netif_rx_ni(skb);
+ }
+}
+
+static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *od)
+{
+ consume_skb(skb);
+ return NET_RX_SUCCESS;
+}
+
+int tipc_attach_loopback(struct net *net)
+{
+ struct net_device *dev = net->loopback_dev;
+ struct tipc_net *tn = tipc_net(net);
+
+ if (!dev)
+ return -ENODEV;
+
+ dev_hold(dev);
+ tn->loopback_pt.dev = dev;
+ tn->loopback_pt.type = htons(ETH_P_TIPC);
+ tn->loopback_pt.func = tipc_loopback_rcv_pkt;
+ dev_add_pack(&tn->loopback_pt);
+ return 0;
+}
+
+void tipc_detach_loopback(struct net *net)
+{
+ struct tipc_net *tn = tipc_net(net);
+
+ dev_remove_pack(&tn->loopback_pt);
+ dev_put(net->loopback_dev);
+}
+
/* Caller should hold rtnl_lock to protect the bearer */
static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
struct tipc_bearer *bearer, int nlflags)