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authorAhmed Abdelsalam <amsalam20@gmail.com>2018-04-28 13:18:35 +0300
committerDavid S. Miller <davem@davemloft.net>2018-04-30 19:13:43 +0300
commit6df93462c2e3ed9656829078aa68214c64619042 (patch)
treed44120381f593a54bbc71876d883953f96dc719c /net
parenta6a188e48959829fc6d64a1b52762314bcaf6417 (diff)
downloadlinux-6df93462c2e3ed9656829078aa68214c64619042.tar.xz
ipv6: sr: extract the right key values for "seg6_make_flowlabel"
The seg6_make_flowlabel() is used by seg6_do_srh_encap() to compute the flowlabel from a given skb. It relies on skb_get_hash() which eventually calls __skb_flow_dissect() to extract the flow_keys struct values from the skb. In case of IPv4 traffic, calling seg6_make_flowlabel() after skb_push(), skb_reset_network_header(), and skb_mac_header_rebuild() will results in flow_keys struct of all key values set to zero. This patch calls seg6_make_flowlabel() before resetting the headers of skb to get the right key values. Extracted Key values are based on the type inner packet as follows: 1) IPv6 traffic: src_IP, dst_IP, L4 proto, and flowlabel of inner packet. 2) IPv4 traffic: src_IP, dst_IP, L4 proto, src_port, and dst_port 3) L2 traffic: depends on what kind of traffic carried into the L2 frame. IPv6 and IPv4 traffic works as discussed 1) and 2) Here a hex_dump of struct flow_keys for IPv4 and IPv6 traffic 10.100.1.100: 47302 > 30.0.0.2: 5001 00000000: 14 00 02 00 00 00 00 00 08 00 11 00 00 00 00 00 00000010: 00 00 00 00 00 00 00 00 13 89 b8 c6 1e 00 00 02 00000020: 0a 64 01 64 fc00:a1:a > b2::2 00000000: 28 00 03 00 00 00 00 00 86 dd 11 00 99 f9 02 00 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 b2 00 00 00000020: 00 00 00 00 00 00 00 00 00 00 00 02 fc 00 00 a1 00000030: 00 00 00 00 00 00 00 00 00 00 00 0a Signed-off-by: Ahmed Abdelsalam <amsalam20@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/seg6_iptunnel.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index 9898926ce30d..eab39bd91548 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -127,6 +127,7 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
return err;
inner_hdr = ipv6_hdr(skb);
+ flowlabel = seg6_make_flowlabel(net, skb, inner_hdr);
skb_push(skb, tot_len);
skb_reset_network_header(skb);
@@ -138,7 +139,6 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
* decapsulation will overwrite inner hlim with outer hlim
*/
- flowlabel = seg6_make_flowlabel(net, skb, inner_hdr);
if (skb->protocol == htons(ETH_P_IPV6)) {
ip6_flow_hdr(hdr, ip6_tclass(ip6_flowinfo(inner_hdr)),
flowlabel);