diff options
Diffstat (limited to 'net/bridge/br_input.c')
| -rw-r--r-- | net/bridge/br_input.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 7985deaff52f..366c43649079 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -147,8 +147,8 @@ static int br_handle_local_finish(struct sk_buff *skb) struct net_bridge_port *p = br_port_get_rcu(skb->dev); u16 vid = 0; - br_vlan_get_tag(skb, &vid); - if (p->flags & BR_LEARNING) + /* check if vlan is allowed, to avoid spoofing */ + if (p->flags & BR_LEARNING && br_should_learn(p, skb, &vid)) br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid, false); return 0; /* process further */ } @@ -177,6 +177,8 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb) p = br_port_get_rcu(skb->dev); if (unlikely(is_link_local_ether_addr(dest))) { + u16 fwd_mask = p->br->group_fwd_mask_required; + /* * See IEEE 802.1D Table 7-10 Reserved addresses * @@ -194,7 +196,8 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb) case 0x00: /* Bridge Group Address */ /* If STP is turned off, then must forward to keep loop detection */ - if (p->br->stp_enabled == BR_NO_STP) + if (p->br->stp_enabled == BR_NO_STP || + fwd_mask & (1u << dest[5])) goto forward; break; @@ -203,7 +206,8 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb) default: /* Allow selective forwarding for most other protocols */ - if (p->br->group_fwd_mask & (1u << dest[5])) + fwd_mask |= p->br->group_fwd_mask; + if (fwd_mask & (1u << dest[5])) goto forward; } |