macvlan: handle fragmented multicast frames
Fragmented multicast frames are delivered to a single macvlan port,
because ip defrag logic considers other samples are redundant.
Implement a defrag step before trying to send the multicast frame.
Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 7b5f032..03bb45a 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1213,43 +1213,6 @@
return f->arr[cpu % num];
}
-static struct sk_buff *fanout_check_defrag(struct sk_buff *skb)
-{
-#ifdef CONFIG_INET
- const struct iphdr *iph;
- u32 len;
-
- if (skb->protocol != htons(ETH_P_IP))
- return skb;
-
- if (!pskb_may_pull(skb, sizeof(struct iphdr)))
- return skb;
-
- iph = ip_hdr(skb);
- if (iph->ihl < 5 || iph->version != 4)
- return skb;
- if (!pskb_may_pull(skb, iph->ihl*4))
- return skb;
- iph = ip_hdr(skb);
- len = ntohs(iph->tot_len);
- if (skb->len < len || len < (iph->ihl * 4))
- return skb;
-
- if (ip_is_fragment(ip_hdr(skb))) {
- skb = skb_share_check(skb, GFP_ATOMIC);
- if (skb) {
- if (pskb_trim_rcsum(skb, len))
- return skb;
- memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
- if (ip_defrag(skb, IP_DEFRAG_AF_PACKET))
- return NULL;
- skb->rxhash = 0;
- }
- }
-#endif
- return skb;
-}
-
static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
@@ -1268,7 +1231,7 @@
case PACKET_FANOUT_HASH:
default:
if (f->defrag) {
- skb = fanout_check_defrag(skb);
+ skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET);
if (!skb)
return 0;
}