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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 " EX_IPHDR_FIELD"
|
.BI tcp " TCPHDR_FIELD"
.RI } " CMD_SPEC"
.ti -8
@ -51,6 +53,10 @@ pedit - generic packet editor action
.IR EX_IPHDR_FIELD " := { "
.BR ttl " }"
.ti -8
.IR TCPHDR_FIELD " := { "
.BR sport " | " dport " | " flags " }"
.ti -8
.IR CMD_SPEC " := {"
.BR clear " | " invert " | " set
@ -199,6 +205,20 @@ are:
.B ttl
.RE
.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
Clear the addressed data (i.e., set it to zero).
.TP
@ -293,6 +313,9 @@ tc filter add dev eth0 parent ffff: u32 \\
tc filter add dev eth0 parent ffff: u32 \\
match ip sport 22 0xffff \\
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
.RE
.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)
{
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;
}
struct m_pedit_util p_pedit_tcp = {