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gso: validate gso_type on ipip style tunnels 

Commit 121d57af30 ("gso: validate gso_type in GSO handlers") added
gso_type validation to existing gso_segment callback functions, to
filter out illegal and potentially dangerous SKB_GSO_DODGY packets.

Convert tunnels that now call inet_gso_segment and ipv6_gso_segment
directly to have their own callbacks and extend validation to these.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2019-02-20 10:52:12 -05:00 committed by David S. Miller
parent 203ef5f1ff
commit 418e897e07
2 changed files with 40 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
net/ipv4/af_inet.c
View File

@ -1385,6 +1385,15 @@ struct sk_buff *inet_gso_segment(struct sk_buff *skb,
}
EXPORT_SYMBOL(inet_gso_segment);
static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
return ERR_PTR(-EINVAL);
return inet_gso_segment(skb, features);
}
INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *,
struct sk_buff *));
INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
@ -1861,7 +1870,7 @@ static struct packet_offload ip_packet_offload __read_mostly = {
static const struct net_offload ipip_offload = {
.callbacks = {
.gso_segment = inet_gso_segment,
.gso_segment = ipip_gso_segment,
.gro_receive = ipip_gro_receive,
.gro_complete = ipip_gro_complete,
},

33
net/ipv6/ip6_offload.c
View File

@ -383,9 +383,36 @@ static struct packet_offload ipv6_packet_offload __read_mostly = {
},
};
static struct sk_buff *sit_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
return ERR_PTR(-EINVAL);
return ipv6_gso_segment(skb, features);
}
static struct sk_buff *ip4ip6_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP6))
return ERR_PTR(-EINVAL);
return inet_gso_segment(skb, features);
}
static struct sk_buff *ip6ip6_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP6))
return ERR_PTR(-EINVAL);
return ipv6_gso_segment(skb, features);
}
static const struct net_offload sit_offload = {
.callbacks = {
.gso_segment = ipv6_gso_segment,
.gso_segment = sit_gso_segment,
.gro_receive = sit_ip6ip6_gro_receive,
.gro_complete = sit_gro_complete,
},
@ -393,7 +420,7 @@ static const struct net_offload sit_offload = {
static const struct net_offload ip4ip6_offload = {
.callbacks = {
.gso_segment = inet_gso_segment,
.gso_segment = ip4ip6_gso_segment,
.gro_receive = ip4ip6_gro_receive,
.gro_complete = ip4ip6_gro_complete,
},
@ -401,7 +428,7 @@ static const struct net_offload ip4ip6_offload = {
static const struct net_offload ip6ip6_offload = {
.callbacks = {
.gso_segment = ipv6_gso_segment,
.gso_segment = ip6ip6_gso_segment,
.gro_receive = sit_ip6ip6_gro_receive,
.gro_complete = ip6ip6_gro_complete,
},