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[NET]: Verify gso_type too in gso_segment

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We don't want nasty Xen guests to pass a TCPv6 packet in with gso_type set
to TCPv4 or even UDP (or a packet that's both TCP and UDP).

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2006-07-03 19:38:35 -07:00 committed by David S. Miller
parent 6ce1669fdb
commit bbcf467dab
3 changed files with 31 additions and 4 deletions
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14
net/ipv4/af_inet.c
View file

@ -1106,7 +1106,15 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
int ihl; int ihl;
int id; int id;
if (!pskb_may_pull(skb, sizeof(*iph))) if (unlikely(skb_shinfo(skb)->gso_type &
~(SKB_GSO_TCPV4 |
SKB_GSO_UDP |
SKB_GSO_DODGY |
SKB_GSO_TCP_ECN |
0)))
goto out;
if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
goto out; goto out;
iph = skb->nh.iph; iph = skb->nh.iph;
@ -1114,7 +1122,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
if (ihl < sizeof(*iph)) if (ihl < sizeof(*iph))
goto out; goto out;
if (!pskb_may_pull(skb, ihl)) if (unlikely(!pskb_may_pull(skb, ihl)))
goto out; goto out;
skb->h.raw = __skb_pull(skb, ihl); skb->h.raw = __skb_pull(skb, ihl);
@ -1125,7 +1133,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
rcu_read_lock(); rcu_read_lock();
ops = rcu_dereference(inet_protos[proto]); ops = rcu_dereference(inet_protos[proto]);
if (ops && ops->gso_segment) if (likely(ops && ops->gso_segment))
segs = ops->gso_segment(skb, features); segs = ops->gso_segment(skb, features);
rcu_read_unlock(); rcu_read_unlock();

13
net/ipv4/tcp.c
View file

@ -2170,8 +2170,19 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features)
if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
/* Packet is from an untrusted source, reset gso_segs. */ /* Packet is from an untrusted source, reset gso_segs. */
int mss = skb_shinfo(skb)->gso_size; int type = skb_shinfo(skb)->gso_type;
int mss;
if (unlikely(type &
~(SKB_GSO_TCPV4 |
SKB_GSO_DODGY |
SKB_GSO_TCP_ECN |
SKB_GSO_TCPV6 |
0) ||
!(type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))))
goto out;
mss = skb_shinfo(skb)->gso_size;
skb_shinfo(skb)->gso_segs = (skb->len + mss - 1) / mss; skb_shinfo(skb)->gso_segs = (skb->len + mss - 1) / mss;
segs = NULL; segs = NULL;

8
net/ipv6/ipv6_sockglue.c
View file

@ -64,6 +64,14 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
struct inet6_protocol *ops; struct inet6_protocol *ops;
int proto; int proto;
if (unlikely(skb_shinfo(skb)->gso_type &
~(SKB_GSO_UDP |
SKB_GSO_DODGY |
SKB_GSO_TCP_ECN |
SKB_GSO_TCPV6 |
0)))
goto out;
if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
goto out; goto out;