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path: root/net/bridge/br_forward.c
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Diffstat (limited to 'net/bridge/br_forward.c')
-rw-r--r--net/bridge/br_forward.c96
1 files changed, 55 insertions, 41 deletions
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 7a241c39698..056b67b0e27 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
+#include <linux/netpoll.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#include <linux/netfilter_bridge.h>
@@ -25,33 +26,25 @@ static int deliver_clone(const struct net_bridge_port *prev,
void (*__packet_hook)(const struct net_bridge_port *p,
struct sk_buff *skb));
-/* Don't forward packets to originating port or forwarding diasabled */
+/* Don't forward packets to originating port or forwarding disabled */
static inline int should_deliver(const struct net_bridge_port *p,
const struct sk_buff *skb)
{
- return (((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
- p->state == BR_STATE_FORWARDING);
-}
-
-static inline unsigned packet_length(const struct sk_buff *skb)
-{
- return skb->len - (skb->protocol == htons(ETH_P_8021Q) ? VLAN_HLEN : 0);
+ return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
+ br_allowed_egress(p->br, nbp_get_vlan_info(p), skb) &&
+ p->state == BR_STATE_FORWARDING;
}
int br_dev_queue_push_xmit(struct sk_buff *skb)
{
- /* drop mtu oversized packets except gso */
- if (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb))
+ /* ip_fragment doesn't copy the MAC header */
+ if (nf_bridge_maybe_copy_header(skb) ||
+ !is_skb_forwardable(skb->dev, skb)) {
kfree_skb(skb);
- else {
- /* ip_refrag calls ip_fragment, doesn't copy the MAC header. */
- if (nf_bridge_maybe_copy_header(skb))
- kfree_skb(skb);
- else {
- skb_push(skb, ETH_HLEN);
-
- dev_queue_xmit(skb);
- }
+ } else {
+ skb_push(skb, ETH_HLEN);
+ br_drop_fake_rtable(skb);
+ dev_queue_xmit(skb);
}
return 0;
@@ -59,16 +52,31 @@ int br_dev_queue_push_xmit(struct sk_buff *skb)
int br_forward_finish(struct sk_buff *skb)
{
- return NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
+ return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
br_dev_queue_push_xmit);
}
static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{
+ skb = br_handle_vlan(to->br, nbp_get_vlan_info(to), skb);
+ if (!skb)
+ return;
+
skb->dev = to->dev;
- NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
- br_forward_finish);
+
+ if (unlikely(netpoll_tx_running(to->br->dev))) {
+ if (!is_skb_forwardable(skb->dev, skb))
+ kfree_skb(skb);
+ else {
+ skb_push(skb, ETH_HLEN);
+ br_netpoll_send_skb(to, skb);
+ }
+ return;
+ }
+
+ NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
+ br_forward_finish);
}
static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
@@ -80,18 +88,22 @@ static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
return;
}
+ skb = br_handle_vlan(to->br, nbp_get_vlan_info(to), skb);
+ if (!skb)
+ return;
+
indev = skb->dev;
skb->dev = to->dev;
skb_forward_csum(skb);
- NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
- br_forward_finish);
+ NF_HOOK(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
+ br_forward_finish);
}
/* called with rcu_read_lock */
void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{
- if (should_deliver(to, skb)) {
+ if (to && should_deliver(to, skb)) {
__br_deliver(to, skb);
return;
}
@@ -119,10 +131,10 @@ static int deliver_clone(const struct net_bridge_port *prev,
void (*__packet_hook)(const struct net_bridge_port *p,
struct sk_buff *skb))
{
+ struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
+
skb = skb_clone(skb, GFP_ATOMIC);
if (!skb) {
- struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
-
dev->stats.tx_dropped++;
return -ENOMEM;
}
@@ -157,7 +169,8 @@ out:
static void br_flood(struct net_bridge *br, struct sk_buff *skb,
struct sk_buff *skb0,
void (*__packet_hook)(const struct net_bridge_port *p,
- struct sk_buff *skb))
+ struct sk_buff *skb),
+ bool unicast)
{
struct net_bridge_port *p;
struct net_bridge_port *prev;
@@ -165,6 +178,9 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
prev = NULL;
list_for_each_entry_rcu(p, &br->port_list, list) {
+ /* Do not flood unicast traffic to ports that turn it off */
+ if (unicast && !(p->flags & BR_FLOOD))
+ continue;
prev = maybe_deliver(prev, p, skb, __packet_hook);
if (IS_ERR(prev))
goto out;
@@ -186,16 +202,16 @@ out:
/* called with rcu_read_lock */
-void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb)
+void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast)
{
- br_flood(br, skb, NULL, __br_deliver);
+ br_flood(br, skb, NULL, __br_deliver, unicast);
}
/* called under bridge lock */
void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
- struct sk_buff *skb2)
+ struct sk_buff *skb2, bool unicast)
{
- br_flood(br, skb, skb2, __br_forward);
+ br_flood(br, skb, skb2, __br_forward, unicast);
}
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
@@ -208,17 +224,15 @@ static void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
{
struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
struct net_bridge *br = netdev_priv(dev);
- struct net_bridge_port *port;
- struct net_bridge_port *lport, *rport;
- struct net_bridge_port *prev;
+ struct net_bridge_port *prev = NULL;
struct net_bridge_port_group *p;
struct hlist_node *rp;
- prev = NULL;
-
- rp = br->router_list.first;
- p = mdst ? mdst->ports : NULL;
+ rp = rcu_dereference(hlist_first_rcu(&br->router_list));
+ p = mdst ? rcu_dereference(mdst->ports) : NULL;
while (p || rp) {
+ struct net_bridge_port *port, *lport, *rport;
+
lport = p ? p->port : NULL;
rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
NULL;
@@ -231,9 +245,9 @@ static void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
goto out;
if ((unsigned long)lport >= (unsigned long)port)
- p = p->next;
+ p = rcu_dereference(p->next);
if ((unsigned long)rport >= (unsigned long)port)
- rp = rp->next;
+ rp = rcu_dereference(hlist_next_rcu(rp));
}
if (!prev)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 03:59:38 +0000