ip, realms: also allow to pass in raw realms value
If get_rt_realms() fails, try to get a possible raw u32 realms
value for the u32 RTA_FLOW/FRA_FLOW attribute, as it might be
useful to directly configure the hex value itself. And only if
that fails, then bail out.
The source realm is provided in the upper u16 (mask: 0xffff0000)
and the destination realm through the lower u16 part (mask:
0x0000ffff). This can be useful for tc's bpf realm matcher, but
also a full hex/mask param can be provided already for matching
through iptables' --realm cmdline option, for example.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
diff --git a/include/rtm_map.h b/include/rtm_map.h
index 70bda7d..d6e5885 100644
--- a/include/rtm_map.h
+++ b/include/rtm_map.h
@@ -4,7 +4,6 @@
char *rtnl_rtntype_n2a(int id, char *buf, int len);
int rtnl_rtntype_a2n(int *id, char *arg);
-int get_rt_realms(__u32 *realms, char *arg);
-
+int get_rt_realms_or_raw(__u32 *realms, char *arg);
#endif /* __RTM_MAP_H__ */
diff --git a/ip/iproute.c b/ip/iproute.c
index b137f55..ae86cc0 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -749,7 +749,7 @@
} else if (matches(*argv, "realms") == 0) {
__u32 realm;
NEXT_ARG();
- if (get_rt_realms(&realm, *argv))
+ if (get_rt_realms_or_raw(&realm, *argv))
invarg("\"realm\" value is invalid\n", *argv);
rta_addattr32(rta, 4096, RTA_FLOW, realm);
rtnh->rtnh_len += sizeof(struct rtattr) + 4;
@@ -1050,7 +1050,7 @@
} else if (matches(*argv, "realms") == 0) {
__u32 realm;
NEXT_ARG();
- if (get_rt_realms(&realm, *argv))
+ if (get_rt_realms_or_raw(&realm, *argv))
invarg("\"realm\" value is invalid\n", *argv);
addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
} else if (strcmp(*argv, "onlink") == 0) {
@@ -1383,7 +1383,7 @@
} else if (matches(*argv, "realms") == 0) {
__u32 realm;
NEXT_ARG();
- if (get_rt_realms(&realm, *argv))
+ if (get_rt_realms_or_raw(&realm, *argv))
invarg("invalid realms\n", *argv);
filter.realm = realm;
filter.realmmask = ~0U;
diff --git a/ip/iprule.c b/ip/iprule.c
index cec2924..9923b8e 100644
--- a/ip/iprule.c
+++ b/ip/iprule.c
@@ -391,7 +391,7 @@
} else if (matches(*argv, "realms") == 0) {
__u32 realm;
NEXT_ARG();
- if (get_rt_realms(&realm, *argv))
+ if (get_rt_realms_or_raw(&realm, *argv))
invarg("invalid realms\n", *argv);
addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
} else if (matches(*argv, "table") == 0 ||
diff --git a/ip/rtm_map.c b/ip/rtm_map.c
index 21e818b..1d7d2c7 100644
--- a/ip/rtm_map.c
+++ b/ip/rtm_map.c
@@ -93,7 +93,7 @@
return 0;
}
-int get_rt_realms(__u32 *realms, char *arg)
+static int get_rt_realms(__u32 *realms, char *arg)
{
__u32 realm = 0;
char *p = strchr(arg, '/');
@@ -114,3 +114,11 @@
*realms |= realm;
return 0;
}
+
+int get_rt_realms_or_raw(__u32 *realms, char *arg)
+{
+ if (!get_rt_realms(realms, arg))
+ return 0;
+
+ return get_unsigned(realms, arg, 0);
+}