tc/pedit: p_udp: introduce pedit udp support

For example, forward udp traffic destined to port 999 to veth0 and set
tcp port to 888:
$ tc filter add dev enp0s9 protocol ip parent ffff: \
    flower \
      ip_proto udp \
      dst_port 999 \
    action pedit ex munge \
      udp dport set 888 \
    action mirred egress \
      redirect dev veth0

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Amir Vadai <amir@vadai.me>

diff --git a/man/man8/tc-pedit.8 b/man/man8/tc-pedit.8
index ad1929592660b22675d09a4f655b48c7e7d63919..7f482eafc6c71a4fd0fd7389f4a5f4ef6cd4f258 100644 (file)
--- a/man/man8/tc-pedit.8
+++ b/man/man8/tc-pedit.8
@@ -34,6 +34,8 @@ pedit - generic packet editor action
 .BI ip " EX_IPHDR_FIELD"
 |
 .BI tcp " TCPHDR_FIELD"
+|
+.BI udp " UDPHDR_FIELD"
 .RI } " CMD_SPEC"
 
 .ti -8
@@ -57,6 +59,10 @@ pedit - generic packet editor action
 .IR TCPHDR_FIELD " := { "
 .BR sport " | " dport " | " flags " }"
 
+.ti -8
+.IR UDPHDR_FIELD " := { "
+.BR sport " | " dport " }"
+
 .ti -8
 .IR CMD_SPEC " := {"
 .BR clear " | " invert " | " set
@@ -219,6 +225,18 @@ Source or destination TCP port number, a 16-bit value.
 .B flags
 .RE
 .TP
+.BI udp " UDPHDR_FIELD"
+The supported keywords for
+.I UDPHDR_FIELD
+are:
+.RS
+.TP
+.B sport
+.TQ
+.B dport
+Source or destination TCP port number, a 16-bit value.
+.RE
+.TP
 .B clear
 Clear the addressed data (i.e., set it to zero).
 .TP

diff --git a/tc/p_udp.c b/tc/p_udp.c
index 3a86ba38239123fac16237bb753ed6a24ec0c120..a56a1b51925422f0e11f2b1d5f8f45470ca392af 100644 (file)
--- a/tc/p_udp.c
+++ b/tc/p_udp.c
@@ -28,6 +28,33 @@ parse_udp(int *argc_p, char ***argv_p,
          struct m_pedit_sel *sel, struct m_pedit_key *tkey)
 {
        int res = -1;
+       int argc = *argc_p;
+       char **argv = *argv_p;
+
+       if (argc < 2)
+               return -1;
+
+       tkey->htype = TCA_PEDIT_KEY_EX_HDR_TYPE_UDP;
+
+       if (strcmp(*argv, "sport") == 0) {
+               NEXT_ARG();
+               tkey->off = 0;
+               res = parse_cmd(&argc, &argv, 2, TU32, RU16, sel, tkey);
+               goto done;
+       }
+
+       if (strcmp(*argv, "dport") == 0) {
+               NEXT_ARG();
+               tkey->off = 2;
+               res = parse_cmd(&argc, &argv, 2, TU32, RU16, sel, tkey);
+               goto done;
+       }
+
+       return -1;
+
+done:
+       *argc_p = argc;
+       *argv_p = argv;
        return res;
 }