@@ -28,6 +28,8 @@ pedit - generic packet editor action
.ti -8
.IR EXTENDED_LAYERED_OP " := { "
.BI ip " IPHDR_FIELD"
+|
+.BI ip " EX_IPHDR_FIELD"
.RI } " CMD_SPEC"
.ti -8
@@ -40,6 +42,10 @@ pedit - generic packet editor action
.BR dport " | " sport " | " icmp_type " | " icmp_code " }"
.ti -8
+.IR EX_IPHDR_FIELD " := { "
+.BR ttl " }"
+
+.ti -8
.IR CMD_SPEC " := {"
.BR clear " | " invert " | " set
.IR VAL " | "
@@ -161,6 +167,17 @@ If it is not or the latter is bigger than the minimum of 20 bytes, this will do
unexpected things. These fields are eight-bit values.
.RE
.TP
+.BI ip " EX_IPHDR_FIELD"
+Supported only when
+.I ex
+is used. The supported keywords for
+.I EX_IPHDR_FIELD
+are:
+.RS
+.TP
+.B ttl
+.RE
+.TP
.B clear
Clear the addressed data (i.e., set it to zero).
.TP
@@ -66,6 +66,12 @@ parse_ip(int *argc_p, char ***argv_p,
res = parse_cmd(&argc, &argv, 1, TU32, 0x0f, sel, tkey);
goto done;
}
+ if (strcmp(*argv, "ttl") == 0) {
+ NEXT_ARG();
+ tkey->off = 8;
+ res = parse_cmd(&argc, &argv, 1, TU32, RU8, sel, tkey);
+ goto done;
+ }
if (strcmp(*argv, "protocol") == 0) {
NEXT_ARG();
tkey->off = 9;
Enable user to edit IP header ttl field. For example, to forward any TCP packet and decrease its TTL by one: $ tc filter add dev enp0s9 protocol ip parent ffff: \ flower \ ip_proto tcp \ action pedit ex munge \ ip ttl add 0xff pipe \ action mirred egress \ redirect dev veth0 Signed-off-by: Amir Vadai <amir@vadai.me> --- man/man8/tc-pedit.8 | 17 +++++++++++++++++ tc/p_ip.c | 6 ++++++ 2 files changed, 23 insertions(+)