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Diffstat (limited to 'net/ipv6/fib6_rules.c')
-rw-r--r--net/ipv6/fib6_rules.c81
1 files changed, 59 insertions, 22 deletions
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index d829874d894..b4d5e1d97c1 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -14,6 +14,7 @@
*/
#include <linux/netdevice.h>
+#include <linux/export.h>
#include <net/fib_rules.h>
#include <net/ipv6.h>
@@ -21,15 +22,14 @@
#include <net/ip6_route.h>
#include <net/netlink.h>
-struct fib6_rule
-{
+struct fib6_rule {
struct fib_rule common;
struct rt6key src;
struct rt6key dst;
u8 tclass;
};
-struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi *fl,
+struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
int flags, pol_lookup_t lookup)
{
struct fib_lookup_arg arg = {
@@ -37,7 +37,8 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi *fl,
.flags = FIB_LOOKUP_NOREF,
};
- fib_rules_lookup(net->ipv6.fib6_rules_ops, fl, flags, &arg);
+ fib_rules_lookup(net->ipv6.fib6_rules_ops,
+ flowi6_to_flowi(fl6), flags, &arg);
if (arg.result)
return arg.result;
@@ -49,30 +50,38 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi *fl,
static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
int flags, struct fib_lookup_arg *arg)
{
+ struct flowi6 *flp6 = &flp->u.ip6;
struct rt6_info *rt = NULL;
struct fib6_table *table;
struct net *net = rule->fr_net;
pol_lookup_t lookup = arg->lookup_ptr;
+ int err = 0;
switch (rule->action) {
case FR_ACT_TO_TBL:
break;
case FR_ACT_UNREACHABLE:
+ err = -ENETUNREACH;
rt = net->ipv6.ip6_null_entry;
goto discard_pkt;
default:
case FR_ACT_BLACKHOLE:
+ err = -EINVAL;
rt = net->ipv6.ip6_blk_hole_entry;
goto discard_pkt;
case FR_ACT_PROHIBIT:
+ err = -EACCES;
rt = net->ipv6.ip6_prohibit_entry;
goto discard_pkt;
}
table = fib6_get_table(net, rule->table);
- if (table)
- rt = lookup(net, table, flp, flags);
+ if (!table) {
+ err = -EAGAIN;
+ goto out;
+ }
+ rt = lookup(net, table, flp6, flags);
if (rt != net->ipv6.ip6_null_entry) {
struct fib6_rule *r = (struct fib6_rule *)rule;
@@ -86,19 +95,20 @@ static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
if (ipv6_dev_get_saddr(net,
ip6_dst_idev(&rt->dst)->dev,
- &flp->fl6_dst,
+ &flp6->daddr,
rt6_flags2srcprefs(flags),
&saddr))
goto again;
if (!ipv6_prefix_equal(&saddr, &r->src.addr,
r->src.plen))
goto again;
- ipv6_addr_copy(&flp->fl6_src, &saddr);
+ flp6->saddr = saddr;
}
goto out;
}
again:
- dst_release(&rt->dst);
+ ip6_rt_put(rt);
+ err = -EAGAIN;
rt = NULL;
goto out;
@@ -106,16 +116,43 @@ discard_pkt:
dst_hold(&rt->dst);
out:
arg->result = rt;
- return rt == NULL ? -EAGAIN : 0;
+ return err;
}
+static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
+{
+ struct rt6_info *rt = (struct rt6_info *) arg->result;
+ struct net_device *dev = NULL;
+
+ if (rt->rt6i_idev)
+ dev = rt->rt6i_idev->dev;
+
+ /* do not accept result if the route does
+ * not meet the required prefix length
+ */
+ if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
+ goto suppress_route;
+
+ /* do not accept result if the route uses a device
+ * belonging to a forbidden interface group
+ */
+ if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
+ goto suppress_route;
+
+ return false;
+
+suppress_route:
+ ip6_rt_put(rt);
+ return true;
+}
static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
struct fib6_rule *r = (struct fib6_rule *) rule;
+ struct flowi6 *fl6 = &fl->u.ip6;
if (r->dst.plen &&
- !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
+ !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
return 0;
/*
@@ -125,14 +162,14 @@ static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
*/
if (r->src.plen) {
if (flags & RT6_LOOKUP_F_HAS_SADDR) {
- if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr,
+ if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
r->src.plen))
return 0;
} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
return 0;
}
- if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
+ if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
return 0;
return 1;
@@ -211,14 +248,13 @@ static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
frh->src_len = rule6->src.plen;
frh->tos = rule6->tclass;
- if (rule6->dst.plen)
- NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
- &rule6->dst.addr);
-
- if (rule6->src.plen)
- NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
- &rule6->src.addr);
-
+ if ((rule6->dst.plen &&
+ nla_put(skb, FRA_DST, sizeof(struct in6_addr),
+ &rule6->dst.addr)) ||
+ (rule6->src.plen &&
+ nla_put(skb, FRA_SRC, sizeof(struct in6_addr),
+ &rule6->src.addr)))
+ goto nla_put_failure;
return 0;
nla_put_failure:
@@ -236,12 +272,13 @@ static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
+ nla_total_size(16); /* src */
}
-static const struct fib_rules_ops __net_initdata fib6_rules_ops_template = {
+static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
.family = AF_INET6,
.rule_size = sizeof(struct fib6_rule),
.addr_size = sizeof(struct in6_addr),
.action = fib6_rule_action,
.match = fib6_rule_match,
+ .suppress = fib6_rule_suppress,
.configure = fib6_rule_configure,
.compare = fib6_rule_compare,
.fill = fib6_rule_fill,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 11:50:24 +0000