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tc/pedit: Introduce 'add' operation

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This command could be useful to increase/decrease fields value.

Signed-off-by: Amir Vadai <amir@vadai.me>
This commit is contained in:
Amir Vadai 2017-04-23 15:53:51 +03:00 committed by Stephen Hemminger
parent 7c71a40cbd
commit c05ddaf9e0
2 changed files with 27 additions and 4 deletions
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13
man/man8/tc-pedit.8
View File

@ -43,6 +43,8 @@ pedit - generic packet editor action
.IR CMD_SPEC " := {"
.BR clear " | " invert " | " set
.IR VAL " | "
.BR add
.IR VAL " | "
.BR preserve " } [ " retain
.IR RVAL " ]"
@ -63,7 +65,9 @@ only for IPv4 headers.
.B ex
Use extended pedit.
.I EXTENDED_LAYERED_OP
is allowed only in this mode.
and the add
.I CMD_SPEC
are allowed only in this mode.
.TP
.BI offset " OFFSET " "\fR{ \fBu32 \fR| \fBu16 \fR| \fBu8 \fR}"
Specify the offset at which to change data.
@ -173,6 +177,13 @@ keywords in
or the size of the addressed header field in
.IR LAYERED_OP .
.TP
.BI add " VAL"
Add the addressed data by a specific value. The size of
.I VAL
is defined by the size of the addressed header field in
.IR EXTENDED_LAYERED_OP .
This operation is supported only for extended layered op.
.TP
.B preserve
Keep the addressed data as is.
.TP

18
tc/m_pedit.c
View File

@ -41,7 +41,7 @@ static void explain(void)
"\t\tATC:= at <atval> offmask <maskval> shift <shiftval>\n"
"\t\tNOTE: offval is byte offset, must be multiple of 4\n"
"\t\tNOTE: maskval is a 32 bit hex number\n \t\tNOTE: shiftval is a shift value\n"
"\t\tCMD:= clear | invert | set <setval>| retain\n"
"\t\tCMD:= clear | invert | set <setval>| add <addval> | retain\n"
"\t<LAYERED>:= ip <ipdata> | ip6 <ip6data>\n"
" \t\t| udp <udpdata> | tcp <tcpdata> | icmp <icmpdata>\n"
"\tCONTROL:= reclassify | pipe | drop | continue | pass\n"
@ -276,7 +276,16 @@ int parse_cmd(int *argc_p, char ***argv_p, __u32 len, int type, __u32 retain,
if (matches(*argv, "invert") == 0) {
val = mask = o;
} else if (matches(*argv, "set") == 0) {
} else if (matches(*argv, "set") == 0 ||
matches(*argv, "add") == 0) {
if (matches(*argv, "add") == 0)
tkey->cmd = TCA_PEDIT_KEY_EX_CMD_ADD;
if (!sel->extended && tkey->cmd) {
fprintf(stderr, "Non extended mode. only 'set' command is supported\n");
return -1;
}
NEXT_ARG();
if (parse_val(&argc, &argv, &val, type))
return -1;
@ -690,9 +699,11 @@ int print_pedit(struct action_util *au, FILE *f, struct rtattr *arg)
for (i = 0; i < sel->nkeys; i++, key++) {
enum pedit_header_type htype =
TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
if (keys_ex) {
htype = key_ex->htype;
cmd = key_ex->cmd;
key_ex++;
}
@ -703,7 +714,8 @@ int print_pedit(struct action_util *au, FILE *f, struct rtattr *arg)
print_pedit_location(f, htype, key->off);
fprintf(f, ": val %08x mask %08x",
fprintf(f, ": %s %08x mask %08x",
cmd ? "add" : "val",
(unsigned int)ntohl(key->val),
(unsigned int)ntohl(key->mask));
}