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authorOr Gerlitz <ogerlitz@mellanox.com>2017-06-01 21:37:37 +0300
committerDavid S. Miller <davem@davemloft.net>2017-06-05 01:12:23 +0300
commit518d8a2e9bad83c6040eccebc3d1f7388fc034e7 (patch)
tree1f10a6e3e6da7803e931bf5c363ae7397d524ec0 /net/core/flow_dissector.c
parentf4d01666616adeebe72f84ee6e9385e309805ba5 (diff)
downloadlinux-518d8a2e9bad83c6040eccebc3d1f7388fc034e7.tar.xz
net/flow_dissector: add support for dissection of misc ip header fields
Add support for dissection of ip tos and ttl and ipv6 traffic-class and hoplimit. Both are dissected into the same struct. Uses similar call to ip dissection function as with tcp, arp and others. Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/flow_dissector.c')
-rw-r--r--net/core/flow_dissector.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 5a45943081f5..fc5fc4594c90 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -367,6 +367,40 @@ __skb_flow_dissect_tcp(const struct sk_buff *skb,
key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
}
+static void
+__skb_flow_dissect_ipv4(const struct sk_buff *skb,
+ struct flow_dissector *flow_dissector,
+ void *target_container, void *data, const struct iphdr *iph)
+{
+ struct flow_dissector_key_ip *key_ip;
+
+ if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
+ return;
+
+ key_ip = skb_flow_dissector_target(flow_dissector,
+ FLOW_DISSECTOR_KEY_IP,
+ target_container);
+ key_ip->tos = iph->tos;
+ key_ip->ttl = iph->ttl;
+}
+
+static void
+__skb_flow_dissect_ipv6(const struct sk_buff *skb,
+ struct flow_dissector *flow_dissector,
+ void *target_container, void *data, const struct ipv6hdr *iph)
+{
+ struct flow_dissector_key_ip *key_ip;
+
+ if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
+ return;
+
+ key_ip = skb_flow_dissector_target(flow_dissector,
+ FLOW_DISSECTOR_KEY_IP,
+ target_container);
+ key_ip->tos = ipv6_get_dsfield(iph);
+ key_ip->ttl = iph->hop_limit;
+}
+
/**
* __skb_flow_dissect - extract the flow_keys struct and return it
* @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
@@ -469,6 +503,9 @@ ip:
}
}
+ __skb_flow_dissect_ipv4(skb, flow_dissector,
+ target_container, data, iph);
+
if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
goto out_good;
@@ -514,6 +551,9 @@ ipv6:
goto out_good;
}
+ __skb_flow_dissect_ipv6(skb, flow_dissector,
+ target_container, data, iph);
+
if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
goto out_good;