diff options
| -rw-r--r-- | net/ipv4/arp.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index ca6e1e6c1496..c22103cec823 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -641,12 +641,12 @@ void arp_xmit(struct sk_buff *skb) } EXPORT_SYMBOL(arp_xmit); -static bool arp_is_garp(struct net_device *dev, int addr_type, - __be16 ar_op, +static bool arp_is_garp(struct net *net, struct net_device *dev, + int *addr_type, __be16 ar_op, __be32 sip, __be32 tip, unsigned char *sha, unsigned char *tha) { - bool is_garp = tip == sip && addr_type == RTN_UNICAST; + bool is_garp = tip == sip; /* Gratuitous ARP _replies_ also require target hwaddr to be * the same as source. @@ -659,6 +659,11 @@ static bool arp_is_garp(struct net_device *dev, int addr_type, tha && !memcmp(tha, sha, dev->addr_len); + if (is_garp) { + *addr_type = inet_addr_type_dev_table(net, dev, sip); + if (*addr_type != RTN_UNICAST) + is_garp = false; + } return is_garp; } @@ -859,18 +864,23 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb) n = __neigh_lookup(&arp_tbl, &sip, dev, 0); if (IN_DEV_ARP_ACCEPT(in_dev)) { - unsigned int addr_type = inet_addr_type_dev_table(net, dev, sip); + addr_type = -1; /* Unsolicited ARP is not accepted by default. It is possible, that this option should be enabled for some devices (strip is candidate) */ - is_garp = arp_is_garp(dev, addr_type, arp->ar_op, + is_garp = arp_is_garp(net, dev, &addr_type, arp->ar_op, sip, tip, sha, tha); if (!n && - ((arp->ar_op == htons(ARPOP_REPLY) && - addr_type == RTN_UNICAST) || is_garp)) + (is_garp || + (arp->ar_op == htons(ARPOP_REPLY) && + (addr_type == RTN_UNICAST || + (addr_type < 0 && + /* postpone calculation to as late as possible */ + inet_addr_type_dev_table(net, dev, sip) == + RTN_UNICAST))))) n = __neigh_lookup(&arp_tbl, &sip, dev, 1); } |