3.2.80-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Eric Dumazet <eduma...@google.com>
[ Upstream commit 34ae6a1aa0540f0f781dd265366036355fdc8930 ]
When a tunnel decapsulates the outer header, it has to comply
with RFC 6080 and eventually propagate CE mark into inner header.
It turns out IP6_ECN_set_ce() does not correctly update skb->csum
for CHECKSUM_COMPLETE packets, triggering infamous "hw csum failure"
messages and stack traces.
Signed-off-by: Eric Dumazet <eduma...@google.com>
Acked-by: Herbert Xu <herb...@gondor.apana.org.au>
Signed-off-by: David S. Miller <da...@davemloft.net>
[bwh: Backported to 3.2:
- Adjust context
- Add skb argument to other callers of IP6_ECN_set_ce()]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
include/net/inet_ecn.h | 19 ++++++++++++++++---
net/ipv6/xfrm6_mode_tunnel.c | 2 +-
2 files changed, 17 insertions(+), 4 deletions(-)
--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -109,11 +109,24 @@ static inline void ipv4_copy_dscp(unsign
struct ipv6hdr;
-static inline int IP6_ECN_set_ce(struct ipv6hdr *iph)
+/* Note:
+ * IP_ECN_set_ce() has to tweak IPV4 checksum when setting CE,
+ * meaning both changes have no effect on skb->csum if/when CHECKSUM_COMPLETE
+ * In IPv6 case, no checksum compensates the change in IPv6 header,
+ * so we have to update skb->csum.
+ */
+static inline int IP6_ECN_set_ce(struct sk_buff *skb, struct ipv6hdr *iph)
{
+ __be32 from, to;
+
if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
return 0;
- *(__be32*)iph |= htonl(INET_ECN_CE << 20);
+
+ from = *(__be32 *)iph;
+ to = from | htonl(INET_ECN_CE << 20);
+ *(__be32 *)iph = to;
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ skb->csum = csum_add(csum_sub(skb->csum, from), to);
return 1;
}
@@ -138,7 +151,7 @@ static inline int INET_ECN_set_ce(struct
case cpu_to_be16(ETH_P_IPV6):
if (skb->network_header + sizeof(struct ipv6hdr) <= skb->tail)
- return IP6_ECN_set_ce(ipv6_hdr(skb));
+ return IP6_ECN_set_ce(skb, ipv6_hdr(skb));
break;
}
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -24,7 +24,7 @@ static inline void ipip6_ecn_decapsulate
struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
if (INET_ECN_is_ce(ipv6_get_dsfield(outer_iph)))
- IP6_ECN_set_ce(inner_iph);
+ IP6_ECN_set_ce(skb, inner_iph);
}
/* Add encapsulation header.
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -535,7 +535,7 @@ static inline void ipgre_ecn_decapsulate
if (skb->protocol == htons(ETH_P_IP)) {
IP_ECN_set_ce(ip_hdr(skb));
} else if (skb->protocol == htons(ETH_P_IPV6)) {
- IP6_ECN_set_ce(ipv6_hdr(skb));
+ IP6_ECN_set_ce(skb, ipv6_hdr(skb));
}
}
}
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -689,7 +689,7 @@ static void ip6ip6_dscp_ecn_decapsulate(
ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
- IP6_ECN_set_ce(ipv6_hdr(skb));
+ IP6_ECN_set_ce(skb, ipv6_hdr(skb));
}
/* called with rcu_read_lock() */
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -553,7 +553,7 @@ out:
static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct
sk_buff *skb)
{
if (INET_ECN_is_ce(iph->tos))
- IP6_ECN_set_ce(ipv6_hdr(skb));
+ IP6_ECN_set_ce(skb, ipv6_hdr(skb));
}
static int ipip6_rcv(struct sk_buff *skb)
