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Diffstat (limited to 'net/ipv4/arp.c')
-rw-r--r--net/ipv4/arp.c41
1 files changed, 27 insertions, 14 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 59b3e0e8fd51..c34c7544d1db 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -665,7 +665,7 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
*/
if (!in_dev)
- goto out;
+ goto out_free_skb;
arp = arp_hdr(skb);
@@ -673,7 +673,7 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
default:
if (arp->ar_pro != htons(ETH_P_IP) ||
htons(dev_type) != arp->ar_hrd)
- goto out;
+ goto out_free_skb;
break;
case ARPHRD_ETHER:
case ARPHRD_FDDI:
@@ -690,17 +690,17 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
arp->ar_pro != htons(ETH_P_IP))
- goto out;
+ goto out_free_skb;
break;
case ARPHRD_AX25:
if (arp->ar_pro != htons(AX25_P_IP) ||
arp->ar_hrd != htons(ARPHRD_AX25))
- goto out;
+ goto out_free_skb;
break;
case ARPHRD_NETROM:
if (arp->ar_pro != htons(AX25_P_IP) ||
arp->ar_hrd != htons(ARPHRD_NETROM))
- goto out;
+ goto out_free_skb;
break;
}
@@ -708,7 +708,7 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
if (arp->ar_op != htons(ARPOP_REPLY) &&
arp->ar_op != htons(ARPOP_REQUEST))
- goto out;
+ goto out_free_skb;
/*
* Extract fields
@@ -733,7 +733,15 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
*/
if (ipv4_is_multicast(tip) ||
(!IN_DEV_ROUTE_LOCALNET(in_dev) && ipv4_is_loopback(tip)))
- goto out;
+ goto out_free_skb;
+
+ /*
+ * For some 802.11 wireless deployments (and possibly other networks),
+ * there will be an ARP proxy and gratuitous ARP frames are attacks
+ * and thus should not be accepted.
+ */
+ if (sip == tip && IN_DEV_ORCONF(in_dev, DROP_GRATUITOUS_ARP))
+ goto out_free_skb;
/*
* Special case: We must set Frame Relay source Q.922 address
@@ -770,7 +778,7 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
!arp_ignore(in_dev, sip, tip))
arp_send_dst(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip,
sha, dev->dev_addr, sha, reply_dst);
- goto out;
+ goto out_consume_skb;
}
if (arp->ar_op == htons(ARPOP_REQUEST) &&
@@ -795,7 +803,7 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
neigh_release(n);
}
}
- goto out;
+ goto out_consume_skb;
} else if (IN_DEV_FORWARD(in_dev)) {
if (addr_type == RTN_UNICAST &&
(arp_fwd_proxy(in_dev, dev, rt) ||
@@ -818,7 +826,7 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
in_dev->arp_parms, skb);
goto out_free_dst;
}
- goto out;
+ goto out_consume_skb;
}
}
}
@@ -868,11 +876,16 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
neigh_release(n);
}
-out:
+out_consume_skb:
consume_skb(skb);
+
out_free_dst:
dst_release(reply_dst);
- return 0;
+ return NET_RX_SUCCESS;
+
+out_free_skb:
+ kfree_skb(skb);
+ return NET_RX_DROP;
}
static void parp_redo(struct sk_buff *skb)
@@ -916,11 +929,11 @@ static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
consumeskb:
consume_skb(skb);
- return 0;
+ return NET_RX_SUCCESS;
freeskb:
kfree_skb(skb);
out_of_mem:
- return 0;
+ return NET_RX_DROP;
}
/*