Commit bc416d97 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarBen Greear <greearb@candelatech.com>
Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f7ba35da
......@@ -169,6 +169,9 @@ static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
port = macvlan_port_get_rcu(skb->dev);
if (is_multicast_ether_addr(eth->h_dest)) {
skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
if (!skb)
return RX_HANDLER_CONSUMED;
src = macvlan_hash_lookup(port, eth->h_source);
if (!src)
/* frame comes from an external address */
......
......@@ -406,9 +406,18 @@ enum ip_defrag_users {
IP_DEFRAG_VS_OUT,
IP_DEFRAG_VS_FWD,
IP_DEFRAG_AF_PACKET,
IP_DEFRAG_MACVLAN,
};
int ip_defrag(struct sk_buff *skb, u32 user);
#ifdef CONFIG_INET
struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
#else
static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
{
return skb;
}
#endif
int ip_frag_mem(struct net *net);
int ip_frag_nqueues(struct net *net);
......
......@@ -682,6 +682,42 @@ int ip_defrag(struct sk_buff *skb, u32 user)
}
EXPORT_SYMBOL(ip_defrag);
struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
{
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, user))
return NULL;
skb->rxhash = 0;
}
}
return skb;
}
EXPORT_SYMBOL(ip_check_defrag);
#ifdef CONFIG_SYSCTL
static int zero;
......
......@@ -1213,43 +1213,6 @@ static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *sk
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 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
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;
}
......
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