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openwrtv3/package/utils/busybox/patches/302-ip-rule-add-suppress-prefixlength.patch
Stefan Tomanek de6ff15129 busybox: backport 'ip rule suppress_{prefixlength, ifgroup}' 
This is a backport from the busybox repository
(192dce4b84fb32346ebc5194de7daa5da3b8d1b4); it enables the use of the
suppress_{prefixlength,ifgroup} flags for policy routing rules.

Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
2017-06-24 13:11:19 +02:00

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From dbac30c3784c267bbe44a2a3ebed4e827c8fe82a Mon Sep 17 00:00:00 2001
From: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
Date: Tue, 13 Jun 2017 19:06:09 +0200
Subject: [PATCH] ip rule: add suppress_{prefixlength,ifgroup} options
(cherry-picked from 192dce4b84fb32346ebc5194de7daa5da3b8d1b4)
function old new delta
iprule_modify 816 887 +71
print_rule 610 680 +70
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 141/0) Total: 141 bytes
Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
networking/libiproute/iprule.c | 73 ++++++++++++++++++++++++++----------------
1 file changed, 46 insertions(+), 27 deletions(-)
--- a/networking/libiproute/iprule.c
+++ b/networking/libiproute/iprule.c
@@ -17,25 +17,32 @@
#include <netinet/ip.h>
#include <arpa/inet.h>
+/* from <linux/fib_rules.h>: */
+#define FRA_SUPPRESS_IFGROUP 13
+#define FRA_SUPPRESS_PREFIXLEN 14
+
#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
-/*
-static void usage(void) __attribute__((noreturn));
-
-static void usage(void)
-{
- fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
- fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
- fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
- fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
- fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
- fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
- fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
- exit(-1);
-}
-*/
+/* If you add stuff here, update iprule_full_usage */
+static const char keywords[] ALIGN1 =
+ "from\0""to\0""preference\0""order\0""priority\0"
+ "tos\0""fwmark\0""realms\0""table\0""lookup\0"
+ "suppress_prefixlength\0""suppress_ifgroup\0"
+ "dev\0""iif\0""nat\0""map-to\0""type\0""help\0"
+ ;
+#define keyword_preference (keywords + sizeof("from") + sizeof("to"))
+#define keyword_fwmark (keyword_preference + sizeof("preference") + sizeof("order") + sizeof("priority") + sizeof("tos"))
+#define keyword_realms (keyword_fwmark + sizeof("fwmark"))
+#define keyword_suppress_prefixlength (keyword_realms + sizeof("realms") + sizeof("table") + sizeof("lookup"))
+#define keyword_suppress_ifgroup (keyword_suppress_prefixlength + sizeof("suppress_prefixlength"))
+enum {
+ ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
+ ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup,
+ ARG_suppress_prefixlength, ARG_suppress_ifgroup,
+ ARG_dev, ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help,
+};
static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
struct nlmsghdr *n, void *arg UNUSED_PARAM)
@@ -119,6 +126,17 @@ static int FAST_FUNC print_rule(const st
else if (r->rtm_table)
printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table));
+ if (tb[FRA_SUPPRESS_PREFIXLEN]) {
+ int pl = *(uint32_t*)RTA_DATA(tb[FRA_SUPPRESS_PREFIXLEN]);
+ if (pl != -1)
+ printf("%s %d ", keyword_suppress_prefixlength, pl);
+ }
+ if (tb[FRA_SUPPRESS_IFGROUP]) {
+ int grp = *(uint32_t*)RTA_DATA(tb[FRA_SUPPRESS_IFGROUP]);
+ if (grp != -1)
+ printf("%s %d ", keyword_suppress_ifgroup, grp);
+ }
+
if (tb[RTA_FLOW]) {
uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
uint32_t from = to>>16;
@@ -174,15 +192,6 @@ static int iprule_list(char **argv)
/* Return value becomes exitcode. It's okay to not return at all */
static int iprule_modify(int cmd, char **argv)
{
- static const char keywords[] ALIGN1 =
- "from\0""to\0""preference\0""order\0""priority\0"
- "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
- "iif\0""nat\0""map-to\0""type\0""help\0";
- enum {
- ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
- ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
- ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
- };
bool table_ok = 0;
struct rtnl_handle rth;
struct {
@@ -232,7 +241,7 @@ static int iprule_modify(int cmd, char *
) {
uint32_t pref;
NEXT_ARG();
- pref = get_u32(*argv, "preference");
+ pref = get_u32(*argv, keyword_preference);
addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
} else if (key == ARG_tos) {
uint32_t tos;
@@ -243,13 +252,13 @@ static int iprule_modify(int cmd, char *
} else if (key == ARG_fwmark) {
uint32_t fwmark;
NEXT_ARG();
- fwmark = get_u32(*argv, "fwmark");
+ fwmark = get_u32(*argv, keyword_fwmark);
addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
} else if (key == ARG_realms) {
uint32_t realm;
NEXT_ARG();
if (get_rt_realms(&realm, *argv))
- invarg_1_to_2(*argv, "realms");
+ invarg_1_to_2(*argv, keyword_realms);
addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
} else if (key == ARG_table ||
key == ARG_lookup
@@ -265,6 +274,16 @@ static int iprule_modify(int cmd, char *
addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
}
table_ok = 1;
+ } else if (key == ARG_suppress_prefixlength) {
+ int prefix_length;
+ NEXT_ARG();
+ prefix_length = get_u32(*argv, keyword_suppress_prefixlength);
+ addattr32(&req.n, sizeof(req), FRA_SUPPRESS_PREFIXLEN, prefix_length);
+ } else if (key == ARG_suppress_ifgroup) {
+ int grp;
+ NEXT_ARG();
+ grp = get_u32(*argv, keyword_suppress_ifgroup);
+ addattr32(&req.n, sizeof(req), FRA_SUPPRESS_IFGROUP, grp);
} else if (key == ARG_dev ||
key == ARG_iif
) {
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