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Message-Id: <1424019439-21042-1-git-send-email-jhs@emojatatu.com>
Date: Sun, 15 Feb 2015 11:57:19 -0500
From: Jamal Hadi Salim <jhs@...atatu.com>
To: stephen@...workplumber.org
Cc: nbd@...nwrt.org, netdev@...r.kernel.org,
Jamal Hadi Salim <jhs@...atatu.com>
Subject: [PATCH 1/1] iproute2: Add support for connmark action
From: Felix Fietkau <nbd@...nwrt.org>
Add ability to add the netfilter connmark support.
Typical usage:
...lets tag outgoing icmp with mark 0x10..
iptables -tmangle -A PREROUTING -p icmp -j CONNMARK --set-mark 0x10
..add on ingress of $ETH an extractor for connmark...
tc filter add dev $ETH parent ffff: prio 4 protocol ip \
u32 match ip protocol 1 0xff \
flowid 1:1 \
action connmark continue
...if the connmark was 0x11, we police to a ridic rate of 10Kbps
tc filter add dev $ETH parent ffff: prio 5 protocol ip \
handle 0x11 fw flowid 1:1 \
action police rate 10kbit burst 10k
Other ways to use the connmark is to supply the zone, index and
branching choice. Refer to help.
Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
---
tc/Makefile | 1 +
tc/m_connmark.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 168 insertions(+)
create mode 100644 tc/m_connmark.c
diff --git a/tc/Makefile b/tc/Makefile
index d831a15..6210b4b 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -46,6 +46,7 @@ TCMODULES += m_skbedit.o
TCMODULES += m_csum.o
TCMODULES += m_simple.o
TCMODULES += m_vlan.o
+TCMODULES += m_connmark.o
TCMODULES += m_bpf.o
TCMODULES += p_ip.o
TCMODULES += p_icmp.o
diff --git a/tc/m_connmark.c b/tc/m_connmark.c
new file mode 100644
index 0000000..51938dc
--- /dev/null
+++ b/tc/m_connmark.c
@@ -0,0 +1,167 @@
+/*
+ * m_connmark.c Connection tracking marking import
+ *
+ * Copyright (c) 2011 Felix Fietkau <nbd@...nwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "utils.h"
+#include "tc_util.h"
+#include <linux/tc_act/tc_connmark.h>
+
+static void
+explain(void)
+{
+ fprintf(stderr, "Usage: ... connmark [ZONE] [BRANCH] [index <INDEX>]\n");
+ fprintf(stderr, "where :\n"
+ "\tZONE is the conntrack zone\n"
+ "\tBRANCH := reclassify|pipe|drop|continue|ok\n");
+}
+
+static void
+usage(void)
+{
+ explain();
+ exit(-1);
+}
+
+static int
+parse_connmark(struct action_util *a, int *argc_p, char ***argv_p, int tca_id,
+ struct nlmsghdr *n)
+{
+ struct tc_connmark sel = {};
+ char **argv = *argv_p;
+ int argc = *argc_p;
+ int ok = 0;
+ struct rtattr *tail;
+
+ while (argc > 0) {
+ if (matches(*argv, "connmark") == 0) {
+ ok = 1;
+ argc--;
+ argv++;
+ } else if (matches(*argv, "help") == 0) {
+ usage();
+ } else {
+ break;
+ }
+
+ }
+
+ if (!ok) {
+ explain();
+ return -1;
+ }
+
+ if (argc) {
+ if (matches(*argv, "zone") == 0) {
+ NEXT_ARG();
+ if (get_u16(&sel.zone, *argv, 10)) {
+ fprintf(stderr, "simple: Illegal \"index\"\n");
+ return -1;
+ }
+ argc--;
+ argv++;
+ }
+ }
+
+ sel.action = TC_ACT_PIPE;
+ if (argc) {
+ if (matches(*argv, "reclassify") == 0) {
+ sel.action = TC_ACT_RECLASSIFY;
+ argc--;
+ argv++;
+ } else if (matches(*argv, "pipe") == 0) {
+ sel.action = TC_ACT_PIPE;
+ argc--;
+ argv++;
+ } else if (matches(*argv, "drop") == 0 ||
+ matches(*argv, "shot") == 0) {
+ sel.action = TC_ACT_SHOT;
+ argc--;
+ argv++;
+ } else if (matches(*argv, "continue") == 0) {
+ sel.action = TC_ACT_UNSPEC;
+ argc--;
+ argv++;
+ } else if (matches(*argv, "pass") == 0) {
+ sel.action = TC_ACT_OK;
+ argc--;
+ argv++;
+ }
+ }
+
+ if (argc) {
+ if (matches(*argv, "index") == 0) {
+ NEXT_ARG();
+ if (get_u32(&sel.index, *argv, 10)) {
+ fprintf(stderr, "simple: Illegal \"index\"\n");
+ return -1;
+ }
+ argc--;
+ argv++;
+ }
+ }
+
+ tail = NLMSG_TAIL(n);
+ addattr_l(n, MAX_MSG, tca_id, NULL, 0);
+ addattr_l(n, MAX_MSG, TCA_CONNMARK_PARMS, &sel, sizeof(sel));
+ tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail;
+
+ *argc_p = argc;
+ *argv_p = argv;
+ return 0;
+}
+
+static int print_connmark(struct action_util *au, FILE *f, struct rtattr *arg)
+{
+ struct rtattr *tb[TCA_CONNMARK_MAX + 1];
+ struct tc_connmark *ci;
+
+ if (arg == NULL)
+ return -1;
+
+ parse_rtattr_nested(tb, TCA_CONNMARK_MAX, arg);
+ if (tb[TCA_CONNMARK_PARMS] == NULL) {
+ fprintf(f, "[NULL connmark parameters]");
+ return -1;
+ }
+
+ ci = RTA_DATA(tb[TCA_CONNMARK_PARMS]);
+
+ fprintf(f, " connmark zone %d\n", ci->zone);
+ fprintf(f, "\t index %d ref %d bind %d", ci->index,
+ ci->refcnt, ci->bindcnt);
+
+ if (show_stats) {
+ if (tb[TCA_CONNMARK_TM]) {
+ struct tcf_t *tm = RTA_DATA(tb[TCA_CONNMARK_TM]);
+ print_tm(f, tm);
+ }
+ }
+ fprintf(f, "\n");
+
+ return 0;
+}
+
+struct action_util connmark_action_util = {
+ .id = "connmark",
+ .parse_aopt = parse_connmark,
+ .print_aopt = print_connmark,
+};
--
1.7.9.5
--
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