Hello,
On Wed, 15 Feb 2017, Vadim Fedorenko wrote:
> IPVS tunnel mode works as simple tunnel (see RFC 3168) copying ECN field
> to outer header. That's result in packet drops on egress tunnels in case
> the egress tunnel operates as ECN-capable with Full-functionality option
> (like ip_tunnel and ip6_tunnel kernel modules), according to RFC 3168
> section 9.1.1 recommendation.
>
> This patch implements ECN full-functionality option into ipvs xmit code.
>
> Cc: netdev@xxxxxxxxxxxxxxx
> Cc: lvs-devel@xxxxxxxxxxxxxxx
> Signed-off-by: Vadim Fedorenko <vfedorenko@xxxxxxxxxxxxxx>
> Reviewed-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Looks good to me, thanks!
Acked-by: Julian Anastasov <ja@xxxxxx>
> ---
> net/netfilter/ipvs/ip_vs_xmit.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
> index 01d3d89..b3286f3 100644
> --- a/net/netfilter/ipvs/ip_vs_xmit.c
> +++ b/net/netfilter/ipvs/ip_vs_xmit.c
> @@ -879,6 +879,7 @@ static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb,
> {
> struct sk_buff *new_skb = NULL;
> struct iphdr *old_iph = NULL;
> + __u8 old_dsfield;
> #ifdef CONFIG_IP_VS_IPV6
> struct ipv6hdr *old_ipv6h = NULL;
> #endif
> @@ -903,7 +904,7 @@ static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb,
> *payload_len =
> ntohs(old_ipv6h->payload_len) +
> sizeof(*old_ipv6h);
> - *dsfield = ipv6_get_dsfield(old_ipv6h);
> + old_dsfield = ipv6_get_dsfield(old_ipv6h);
> *ttl = old_ipv6h->hop_limit;
> if (df)
> *df = 0;
> @@ -918,12 +919,15 @@ static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb,
>
> /* fix old IP header checksum */
> ip_send_check(old_iph);
> - *dsfield = ipv4_get_dsfield(old_iph);
> + old_dsfield = ipv4_get_dsfield(old_iph);
> *ttl = old_iph->ttl;
> if (payload_len)
> *payload_len = ntohs(old_iph->tot_len);
> }
>
> + /* Implement full-functionality option for ECN encapsulation */
> + *dsfield = INET_ECN_encapsulate(old_dsfield, old_dsfield);
> +
> return skb;
> error:
> kfree_skb(skb);
> --
> 1.9.1
Regards
--
Julian Anastasov <ja@xxxxxx>
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