diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 299ec4b314123e31bf014153ab28a328ea050f26..2220b9e2dab095b6c2c0bea11fe1e0f4417145b4 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1702,6 +1702,20 @@ static inline int skb_is_gso_v6(const struct sk_buff *skb) return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6; } +extern void __skb_warn_lro_forwarding(const struct sk_buff *skb); + +static inline bool skb_warn_if_lro(const struct sk_buff *skb) +{ + /* LRO sets gso_size but not gso_type, whereas if GSO is really + * wanted then gso_type will be set. */ + struct skb_shared_info *shinfo = skb_shinfo(skb); + if (shinfo->gso_size != 0 && unlikely(shinfo->gso_type == 0)) { + __skb_warn_lro_forwarding(skb); + return true; + } + return false; +} + static inline void skb_forward_csum(struct sk_buff *skb) { /* Unfortunately we don't support this one. Any brave souls? */ diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c index 512645727f51765e6ce3958b6da4e0c4a2f63ffc..bdd9ccea17ceb992a956453f8c9611c5ed92c244 100644 --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -89,7 +89,7 @@ void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb) /* called with rcu_read_lock */ void br_forward(const struct net_bridge_port *to, struct sk_buff *skb) { - if (should_deliver(to, skb)) { + if (!skb_warn_if_lro(skb) && should_deliver(to, skb)) { __br_forward(to, skb); return; } diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 3e18f8525e82706e37f0cfcc8c30fb3c3e3db43c..2df012be973d4f580f2f6733c297e6cc6f5ad9cb 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2583,6 +2583,13 @@ bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off) return true; } +void __skb_warn_lro_forwarding(const struct sk_buff *skb) +{ + if (net_ratelimit()) + pr_warning("%s: received packets cannot be forwarded" + " while LRO is enabled\n", skb->dev->name); +} + EXPORT_SYMBOL(___pskb_trim); EXPORT_SYMBOL(__kfree_skb); EXPORT_SYMBOL(kfree_skb); @@ -2616,6 +2623,7 @@ EXPORT_SYMBOL(skb_seq_read); EXPORT_SYMBOL(skb_abort_seq_read); EXPORT_SYMBOL(skb_find_text); EXPORT_SYMBOL(skb_append_datato_frags); +EXPORT_SYMBOL(__skb_warn_lro_forwarding); EXPORT_SYMBOL_GPL(skb_to_sgvec); EXPORT_SYMBOL_GPL(skb_cow_data); diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c index 37d36a3f33cde63eb1caced6e7d43b92a6e1c739..da14725916d3437b66ba9c53ecc82a68e82d0a36 100644 --- a/net/ipv4/ip_forward.c +++ b/net/ipv4/ip_forward.c @@ -56,6 +56,9 @@ int ip_forward(struct sk_buff *skb) struct rtable *rt; /* Route we use */ struct ip_options * opt = &(IPCB(skb)->opt); + if (skb_warn_if_lro(skb)) + goto drop; + if (!xfrm4_policy_check(NULL, XFRM_POLICY_FWD, skb)) goto drop; diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 40a2813a63d17ca6987980c3ac31fb0301cb0d11..fd7cd1bfe1510e4e71fcd000b02087a8c4280d97 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -407,6 +407,9 @@ int ip6_forward(struct sk_buff *skb) if (ipv6_devconf.forwarding == 0) goto error; + if (skb_warn_if_lro(skb)) + goto drop; + if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); goto drop;