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tc/pedit: p_tcp: introduce pedit tcp support

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For example, forward tcp traffic destined to port 80 to veth0 and set
tcp port to 8080:
$ tc filter add dev enp0s9 protocol ip parent ffff: \
    flower \
      ip_proto tcp \
      dst_port 80 \
    action pedit ex munge \
      tcp dport set 8080 \
    action mirred egress \
      redirect dev veth0

Signed-off-by: Amir Vadai <amir@vadai.me>
This commit is contained in:
Amir Vadai 2017-04-23 15:53:55 +03:00 committed by Stephen Hemminger
parent 3cd5149ecd
commit 2c6eb12ab8
2 changed files with 60 additions and 0 deletions
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23
man/man8/tc-pedit.8
View File

@ -32,6 +32,8 @@ pedit - generic packet editor action
.BI ip " IPHDR_FIELD" .BI ip " IPHDR_FIELD"
| |
.BI ip " EX_IPHDR_FIELD" .BI ip " EX_IPHDR_FIELD"
|
.BI tcp " TCPHDR_FIELD"
.RI } " CMD_SPEC" .RI } " CMD_SPEC"
.ti -8 .ti -8
@ -51,6 +53,10 @@ pedit - generic packet editor action
.IR EX_IPHDR_FIELD " := { " .IR EX_IPHDR_FIELD " := { "
.BR ttl " }" .BR ttl " }"
.ti -8
.IR TCPHDR_FIELD " := { "
.BR sport " | " dport " | " flags " }"
.ti -8 .ti -8
.IR CMD_SPEC " := {" .IR CMD_SPEC " := {"
.BR clear " | " invert " | " set .BR clear " | " invert " | " set
@ -199,6 +205,20 @@ are:
.B ttl .B ttl
.RE .RE
.TP .TP
.BI tcp " TCPHDR_FIELD"
The supported keywords for
.I TCPHDR_FIELD
are:
.RS
.TP
.B sport
.TQ
.B dport
Source or destination TCP port number, a 16-bit value.
.TP
.B flags
.RE
.TP
.B clear .B clear
Clear the addressed data (i.e., set it to zero). Clear the addressed data (i.e., set it to zero).
.TP .TP
@ -293,6 +313,9 @@ tc filter add dev eth0 parent ffff: u32 \\
tc filter add dev eth0 parent ffff: u32 \\ tc filter add dev eth0 parent ffff: u32 \\
match ip sport 22 0xffff \\ match ip sport 22 0xffff \\
action pedit ex munge eth dst set 11:22:33:44:55:66 action pedit ex munge eth dst set 11:22:33:44:55:66
tc filter add dev eth0 parent ffff: u32 \\
match ip dport 23 0xffff \\
action pedit ex munge tcp dport set 22
.EE .EE
.RE .RE
.SH SEE ALSO .SH SEE ALSO

37
tc/p_tcp.c
View File

@ -28,6 +28,43 @@ parse_tcp(int *argc_p, char ***argv_p,
struct m_pedit_sel *sel, struct m_pedit_key *tkey) struct m_pedit_sel *sel, struct m_pedit_key *tkey)
{ {
int res = -1; int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
if (argc < 2)
return -1;
if (!sel->extended)
return -1;
tkey->htype = TCA_PEDIT_KEY_EX_HDR_TYPE_TCP;
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;
}
if (strcmp(*argv, "flags") == 0) {
NEXT_ARG();
tkey->off = 13;
res = parse_cmd(&argc, &argv, 1, TU32, RU8, sel, tkey);
goto done;
}
return -1;
done:
*argc_p = argc;
*argv_p = argv;
return res; return res;
} }
struct m_pedit_util p_pedit_tcp = { struct m_pedit_util p_pedit_tcp = {