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-rw-r--r--include/linux/fib_rules.h11
-rw-r--r--net/ipv6/fib6_rules.c34
2 files changed, 38 insertions, 7 deletions
diff --git a/include/linux/fib_rules.h b/include/linux/fib_rules.h
index f278ba781d09..87b606b63f1e 100644
--- a/include/linux/fib_rules.h
+++ b/include/linux/fib_rules.h
@@ -5,10 +5,13 @@
#include <linux/rtnetlink.h>
/* rule is permanent, and cannot be deleted */
-#define FIB_RULE_PERMANENT 1
-#define FIB_RULE_INVERT 2
-#define FIB_RULE_UNRESOLVED 4
-#define FIB_RULE_DEV_DETACHED 8
+#define FIB_RULE_PERMANENT 0x00000001
+#define FIB_RULE_INVERT 0x00000002
+#define FIB_RULE_UNRESOLVED 0x00000004
+#define FIB_RULE_DEV_DETACHED 0x00000008
+
+/* try to find source address in routing lookups */
+#define FIB_RULE_FIND_SADDR 0x00010000
struct fib_rule_hdr
{
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index dd9720e700ef..fc3882c90604 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -17,6 +17,7 @@
#include <net/fib_rules.h>
#include <net/ipv6.h>
+#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/netlink.h>
@@ -95,8 +96,27 @@ static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
if (table)
rt = lookup(table, flp, flags);
- if (rt != &ip6_null_entry)
+ if (rt != &ip6_null_entry) {
+ struct fib6_rule *r = (struct fib6_rule *)rule;
+
+ /*
+ * If we need to find a source address for this traffic,
+ * we check the result if it meets requirement of the rule.
+ */
+ if ((rule->flags & FIB_RULE_FIND_SADDR) &&
+ r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
+ struct in6_addr saddr;
+ if (ipv6_get_saddr(&rt->u.dst, &flp->fl6_dst,
+ &saddr))
+ goto again;
+ if (!ipv6_prefix_equal(&saddr, &r->src.addr,
+ r->src.plen))
+ goto again;
+ ipv6_addr_copy(&flp->fl6_src, &saddr);
+ }
goto out;
+ }
+again:
dst_release(&rt->u.dst);
rt = NULL;
goto out;
@@ -117,9 +137,17 @@ static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
return 0;
+ /*
+ * If FIB_RULE_FIND_SADDR is set and we do not have a
+ * source address for the traffic, we defer check for
+ * source address.
+ */
if (r->src.plen) {
- if (!(flags & RT6_LOOKUP_F_HAS_SADDR) ||
- !ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
+ if (flags & RT6_LOOKUP_F_HAS_SADDR) {
+ if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr,
+ r->src.plen))
+ return 0;
+ } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
return 0;
}