/*
* Called via br_handle_frame_hook.
* Return 0 if *pskb should be processed furthur
* 1 if *pskb is handled
* note: already called with rcu_read_lock (preempt_disabled)
*/
int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
const unsigned char *dest = eth_hdr(skb)->h_dest;
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
goto err;
if (unlikely(is_link_local(dest))) {
skb->pkt_type = PACKET_HOST;
return NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
NULL, br_handle_local_finish) != 0;
}
if (p->state == BR_STATE_FORWARDING || p->state == BR_STATE_LEARNING) {
if (br_should_route_hook) {
if (br_should_route_hook(pskb))
return 0;
skb = *pskb;
dest = eth_hdr(skb)->h_dest;
}
if (!compare_ether_addr(p->br->dev->dev_addr, dest))
skb->pkt_type = PACKET_HOST;
NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
return 1;
}
err:
kfree_skb(skb);
return 1;
}
/*
* Called via br_handle_frame_hook.
* Return 0 if *pskb should be processed furthur
* 1 if *pskb is handled
* note: already called with rcu_read_lock (preempt_disabled)
*/
int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
const unsigned char *dest = eth_hdr(skb)->h_dest;
if (p->state == BR_STATE_DISABLED)
goto err;
if (eth_hdr(skb)->h_source[0] & 1)
goto err;
if (p->state == BR_STATE_LEARNING ||
p->state == BR_STATE_FORWARDING)
br_fdb_insert(p->br, p, eth_hdr(skb)->h_source, 0);
if (p->br->stp_enabled &&
!memcmp(dest, bridge_ula, 5) &&
!(dest[5] & 0xF0)) {
if (!dest[5]) {
NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
NULL, br_stp_handle_bpdu);
return 1;
}
}
else if (p->state == BR_STATE_FORWARDING) {
if (br_should_route_hook) {
if (br_should_route_hook(pskb))
return 0;
skb = *pskb;
dest = eth_hdr(skb)->h_dest;
}
if (!memcmp(p->br->dev->dev_addr, dest, ETH_ALEN))
skb->pkt_type = PACKET_HOST;
NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
return 1;
}
err:
kfree_skb(skb);
return 1;
}
/*
* Called via br_handle_frame_hook.
* Return 0 if *pskb should be processed furthur
* 1 if *pskb is handled
* note: already called with rcu_read_lock (preempt_disabled)
*/
int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
const unsigned char *dest = eth_hdr(skb)->h_dest;
if (p->state == BR_STATE_DISABLED)
goto err;
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
goto err;
if (p->state == BR_STATE_LEARNING)
br_fdb_update(p->br, p, eth_hdr(skb)->h_source);
if (p->br->stp_enabled &&
!memcmp(dest, bridge_ula, 5) &&
!(dest[5] & 0xF0)) {
if (!dest[5]) {
NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
NULL, br_stp_handle_bpdu);
return 1;
}
}
else if (p->state == BR_STATE_FORWARDING || skb->protocol == __constant_htons(ETH_P_EAPOL)) {
if (br_should_route_hook) {
if (br_should_route_hook(pskb))
return 0;
skb = *pskb;
dest = eth_hdr(skb)->h_dest;
}
if (!compare_ether_addr(p->br->dev->dev_addr, dest))
skb->pkt_type = PACKET_HOST;
NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
return 1;
}
err:
kfree_skb(skb);
return 1;
}
/*
* Called via br_handle_frame_hook.
* Return NULL if skb is handled
* note: already called with rcu_read_lock (preempt_disabled)
*/
struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
{
const unsigned char *dest = eth_hdr(skb)->h_dest;
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
goto drop;
if (unlikely(is_link_local(dest))) {
/* Pause frames shouldn't be passed up by driver anyway */
if (skb->protocol == htons(ETH_P_PAUSE))
goto drop;
/* Process STP BPDU's through normal netif_receive_skb() path */
if (p->br->stp_enabled != BR_NO_STP) {
if (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
NULL, br_handle_local_finish))
return NULL;
else
return skb;
}
}
switch (p->state) {
case BR_STATE_FORWARDING:
if (br_should_route_hook) {
if (br_should_route_hook(&skb))
return skb;
dest = eth_hdr(skb)->h_dest;
}
/* fall through */
case BR_STATE_LEARNING:
if (!compare_ether_addr(p->br->dev->dev_addr, dest))
skb->pkt_type = PACKET_HOST;
NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
break;
default:
drop:
kfree_skb(skb);
}
return NULL;
}
int br_handle_frame(struct sk_buff *skb)
{
struct net_bridge *br;
unsigned char *dest;
struct net_bridge_port *p;
dest = skb->mac.ethernet->h_dest;
p = skb->dev->br_port;
if (p == NULL)
goto err_nolock;
br = p->br;
read_lock(&br->lock);
if (skb->dev->br_port == NULL)
goto err;
if (!(br->dev.flags & IFF_UP) ||
p->state == BR_STATE_DISABLED)
goto err;
if (skb->mac.ethernet->h_source[0] & 1)
goto err;
if (p->state == BR_STATE_LEARNING ||
p->state == BR_STATE_FORWARDING)
br_fdb_insert(br, p, skb->mac.ethernet->h_source, 0);
if (br->stp_enabled &&
!memcmp(dest, bridge_ula, 5) &&
!(dest[5] & 0xF0))
goto handle_special_frame;
if (p->state == BR_STATE_FORWARDING) {
if (br_should_route_hook && br_should_route_hook(&skb)) {
read_unlock(&br->lock);
return -1;
}
NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
read_unlock(&br->lock);
return 0;
}
err:
read_unlock(&br->lock);
err_nolock:
kfree_skb(skb);
return 0;
handle_special_frame:
if (!dest[5]) {
br_stp_handle_bpdu(skb);
read_unlock(&br->lock);
return 0;
}
kfree_skb(skb);
read_unlock(&br->lock);
return 0;
}