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authorAmir Vadai <amir@vadai.me>2017-02-07 09:56:07 +0200
committerDavid S. Miller <davem@davemloft.net>2017-02-10 13:18:33 -0500
commit71d0ed7079dffbc5cd0941d77d9b84e04109c9bb (patch)
tree21d4b1b2384315a0824e30a40c6dac91064b4023 /include/net/tc_act
parentea6da4fd388a1eeab30d64da3eab3c5338714c74 (diff)
net/act_pedit: Support using offset relative to the conventional network headers
Extend pedit to enable the user setting offset relative to network headers. This change would enable to work with more complex header schemes (vs the simple IPv4 case) where setting a fixed offset relative to the network header is not enough. After this patch, the action has information about the exact header type and field inside this header. This information could be used later on for hardware offloading of pedit. Backward compatibility was being kept: 1. Old kernel <-> new userspace 2. New kernel <-> old userspace 3. add rule using new userspace <-> dump using old userspace 4. add rule using old userspace <-> dump using new userspace When using the extended api, new netlink attributes are being used. This way, operation will fail in (1) and (3) - and no malformed rule be added or dumped. Of course, new user space that doesn't need the new functionality can use the old netlink attributes and operation will succeed. Since action can support both api's, (2) should work, and it is easy to write the new user space to have (4) work. The action is having a strict check that only header types and commands it can handle are accepted. This way future additions will be much easier. Usage example: $ tc filter add dev enp0s9 protocol ip parent ffff: \ flower \ ip_proto tcp \ dst_port 80 \ action pedit munge tcp dport set 8080 pipe \ action mirred egress redirect dev veth0 Will forward tcp port whose original dest port is 80, while modifying the destination port to 8080. Signed-off-by: Amir Vadai <amir@vadai.me> Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tc_act')
-rw-r--r--include/net/tc_act/tc_pedit.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/tc_act/tc_pedit.h b/include/net/tc_act/tc_pedit.h
index 29e38d6823df..e076f22035a5 100644
--- a/include/net/tc_act/tc_pedit.h
+++ b/include/net/tc_act/tc_pedit.h
@@ -3,11 +3,16 @@
#include <net/act_api.h>
+struct tcf_pedit_key_ex {
+ enum pedit_header_type htype;
+};
+
struct tcf_pedit {
struct tc_action common;
unsigned char tcfp_nkeys;
unsigned char tcfp_flags;
struct tc_pedit_key *tcfp_keys;
+ struct tcf_pedit_key_ex *tcfp_keys_ex;
};
#define to_pedit(a) ((struct tcf_pedit *)a)