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ip rule: add support for fwmark/fwmask for policy routing

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This adds support for fwmark/fwmask in ip rule which is needed, for example, in
OpenWrt's mwan3. Masks are supported since Linux 2.6.19.

Fixes: https://bugs.busybox.net/show_bug.cgi?id=11621

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Rui Salvaterra 2020-07-31 10:10:36 +01:00 committed by Denys Vlasenko
parent 16e82c61d4
commit eecd6f7a6c
2 changed files with 27 additions and 7 deletions
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2
networking/ip.c
View File

@ -252,7 +252,7 @@
//usage:#define iprule_trivial_usage
//usage: "[list] | add|del SELECTOR ACTION"
//usage:#define iprule_full_usage "\n\n"
//usage: " SELECTOR := [from PREFIX] [to PREFIX] [tos TOS] [fwmark FWMARK]\n"
//usage: " SELECTOR := [from PREFIX] [to PREFIX] [tos TOS] [fwmark FWMARK[/MASK]]\n"
//usage: " [dev IFACE] [pref NUMBER]\n"
//usage: " ACTION := [table TABLE_ID] [nat ADDR]\n"
//usage: " [prohibit|reject|unreachable]\n"

32
networking/libiproute/iprule.c
View File

@ -17,8 +17,10 @@
#include <arpa/inet.h>
/* from <linux/fib_rules.h>: */
#define FRA_SUPPRESS_IFGROUP 13
#define FRA_SUPPRESS_PREFIXLEN 14
#define FRA_FWMARK 10
#define FRA_SUPPRESS_IFGROUP 13
#define FRA_SUPPRESS_PREFIXLEN 14
#define FRA_FWMASK 16
#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
@ -117,8 +119,18 @@ static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
if (r->rtm_tos) {
printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos));
}
if (tb[RTA_PROTOINFO]) {
printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
if (tb[FRA_FWMARK] || tb[FRA_FWMASK]) {
uint32_t mark = 0, mask = 0;
if (tb[FRA_FWMARK])
mark = *(uint32_t*)RTA_DATA(tb[FRA_FWMARK]);
if (tb[FRA_FWMASK]
&& (mask = *(uint32_t*)RTA_DATA(tb[FRA_FWMASK])) != 0xFFFFFFFF
)
printf("fwmark %#x/%#x ", mark, mask);
else
printf("fwmark %#x ", mark);
}
if (tb[RTA_IIF]) {
@ -257,10 +269,18 @@ static int iprule_modify(int cmd, char **argv)
invarg_1_to_2(*argv, "TOS");
req.r.rtm_tos = tos;
} else if (key == ARG_fwmark) {
uint32_t fwmark;
char *slash;
uint32_t fwmark, fwmask;
NEXT_ARG();
slash = strchr(*argv, '/');
if (slash)
*slash = '\0';
fwmark = get_u32(*argv, keyword_fwmark);
addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
if (slash) {
fwmask = get_u32(slash + 1, "fwmask");
addattr32(&req.n, sizeof(req), FRA_FWMASK, fwmask);
}
} else if (key == ARG_realms) {
uint32_t realm;
NEXT_ARG();