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-rw-r--r--include/net/fib_rules.h2
-rw-r--r--include/net/ip_fib.h17
-rw-r--r--net/core/fib_rules.c3
-rw-r--r--net/ipv4/fib_frontend.c27
-rw-r--r--net/ipv4/fib_hash.c5
-rw-r--r--net/ipv4/fib_lookup.h2
-rw-r--r--net/ipv4/fib_rules.c3
-rw-r--r--net/ipv4/fib_semantics.c21
-rw-r--r--net/ipv4/fib_trie.c10
-rw-r--r--net/ipv4/route.c59
10 files changed, 72 insertions, 77 deletions
diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
index ac2fd002812..106f3097d38 100644
--- a/include/net/fib_rules.h
+++ b/include/net/fib_rules.h
@@ -31,6 +31,8 @@ struct fib_lookup_arg {
void *lookup_ptr;
void *result;
struct fib_rule *rule;
+ int flags;
+#define FIB_LOOKUP_NOREF 1
};
struct fib_rules_ops {
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index c93f94edc61..ba3666d3176 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -86,6 +86,7 @@ struct fib_info {
#ifdef CONFIG_IP_ROUTE_MULTIPATH
int fib_power;
#endif
+ struct rcu_head rcu;
struct fib_nh fib_nh[0];
#define fib_dev fib_nh[0].nh_dev
};
@@ -148,7 +149,7 @@ struct fib_table {
};
extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
- struct fib_result *res);
+ struct fib_result *res, int fib_flags);
extern int fib_table_insert(struct fib_table *, struct fib_config *);
extern int fib_table_delete(struct fib_table *, struct fib_config *);
extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
@@ -185,11 +186,11 @@ static inline int fib_lookup(struct net *net, const struct flowi *flp,
struct fib_table *table;
table = fib_get_table(net, RT_TABLE_LOCAL);
- if (!fib_table_lookup(table, flp, res))
+ if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
return 0;
table = fib_get_table(net, RT_TABLE_MAIN);
- if (!fib_table_lookup(table, flp, res))
+ if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
return 0;
return -ENETUNREACH;
}
@@ -254,16 +255,6 @@ static inline void fib_info_put(struct fib_info *fi)
free_fib_info(fi);
}
-static inline void fib_res_put(struct fib_result *res)
-{
- if (res->fi)
- fib_info_put(res->fi);
-#ifdef CONFIG_IP_MULTIPLE_TABLES
- if (res->r)
- fib_rule_put(res->r);
-#endif
-}
-
#ifdef CONFIG_PROC_FS
extern int __net_init fib_proc_init(struct net *net);
extern void __net_exit fib_proc_exit(struct net *net);
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index cfb7d25c172..21698f8c49e 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -225,7 +225,8 @@ jumped:
err = ops->action(rule, fl, flags, arg);
if (err != -EAGAIN) {
- if (likely(atomic_inc_not_zero(&rule->refcnt))) {
+ if ((arg->flags & FIB_LOOKUP_NOREF) ||
+ likely(atomic_inc_not_zero(&rule->refcnt))) {
arg->rule = rule;
goto out;
}
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index b05c23b05a9..919f2ad19b4 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -168,8 +168,11 @@ struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
struct fib_result res = { 0 };
struct net_device *dev = NULL;
- if (fib_lookup(net, &fl, &res))
+ rcu_read_lock();
+ if (fib_lookup(net, &fl, &res)) {
+ rcu_read_unlock();
return NULL;
+ }
if (res.type != RTN_LOCAL)
goto out;
dev = FIB_RES_DEV(res);
@@ -177,7 +180,7 @@ struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
if (dev && devref)
dev_hold(dev);
out:
- fib_res_put(&res);
+ rcu_read_unlock();
return dev;
}
EXPORT_SYMBOL(__ip_dev_find);
@@ -207,11 +210,12 @@ static inline unsigned __inet_dev_addr_type(struct net *net,
local_table = fib_get_table(net, RT_TABLE_LOCAL);
if (local_table) {
ret = RTN_UNICAST;
- if (!fib_table_lookup(local_table, &fl, &res)) {
+ rcu_read_lock();
+ if (!fib_table_lookup(local_table, &fl, &res, FIB_LOOKUP_NOREF)) {
if (!dev || dev == res.fi->fib_dev)
ret = res.type;
- fib_res_put(&res);
}
+ rcu_read_unlock();
}
return ret;
}
@@ -235,6 +239,7 @@ EXPORT_SYMBOL(inet_dev_addr_type);
* - figure out what "logical" interface this packet arrived
* and calculate "specific destination" address.
* - check, that packet arrived from expected physical interface.
+ * called with rcu_read_lock()
*/
int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
struct net_device *dev, __be32 *spec_dst,
@@ -259,7 +264,6 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
struct net *net;
no_addr = rpf = accept_local = 0;
- rcu_read_lock();
in_dev = __in_dev_get_rcu(dev);
if (in_dev) {
no_addr = in_dev->ifa_list == NULL;
@@ -268,7 +272,6 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
if (mark && !IN_DEV_SRC_VMARK(in_dev))
fl.mark = 0;
}
- rcu_read_unlock();
if (in_dev == NULL)
goto e_inval;
@@ -278,7 +281,7 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
goto last_resort;
if (res.type != RTN_UNICAST) {
if (res.type != RTN_LOCAL || !accept_local)
- goto e_inval_res;
+ goto e_inval;
}
*spec_dst = FIB_RES_PREFSRC(res);
fib_combine_itag(itag, &res);
@@ -299,10 +302,8 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
#endif
if (dev_match) {
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
- fib_res_put(&res);
return ret;
}
- fib_res_put(&res);
if (no_addr)
goto last_resort;
if (rpf == 1)
@@ -315,7 +316,6 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
*spec_dst = FIB_RES_PREFSRC(res);
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
}
- fib_res_put(&res);
}
return ret;
@@ -326,8 +326,6 @@ last_resort:
*itag = 0;
return 0;
-e_inval_res:
- fib_res_put(&res);
e_inval:
return -EINVAL;
e_rpf:
@@ -873,15 +871,16 @@ static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
local_bh_disable();
frn->tb_id = tb->tb_id;
- frn->err = fib_table_lookup(tb, &fl, &res);
+ rcu_read_lock();
+ frn->err = fib_table_lookup(tb, &fl, &res, FIB_LOOKUP_NOREF);
if (!frn->err) {
frn->prefixlen = res.prefixlen;
frn->nh_sel = res.nh_sel;
frn->type = res.type;
frn->scope = res.scope;
- fib_res_put(&res);
}
+ rcu_read_unlock();
local_bh_enable();
}
}
diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index 4ed7e0dea1b..83cca68e259 100644
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -244,7 +244,8 @@ fn_new_zone(struct fn_hash *table, int z)
}
int fib_table_lookup(struct fib_table *tb,
- const struct flowi *flp, struct fib_result *res)
+ const struct flowi *flp, struct fib_result *res,
+ int fib_flags)
{
int err;
struct fn_zone *fz;
@@ -264,7 +265,7 @@ int fib_table_lookup(struct fib_table *tb,
err = fib_semantic_match(&f->fn_alias,
flp, res,
- fz->fz_order);
+ fz->fz_order, fib_flags);
if (err <= 0)
goto out;
}
diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h
index 637b133973b..b9c9a9f2aee 100644
--- a/net/ipv4/fib_lookup.h
+++ b/net/ipv4/fib_lookup.h
@@ -22,7 +22,7 @@ struct fib_alias {
/* Exported by fib_semantics.c */
extern int fib_semantic_match(struct list_head *head,
const struct flowi *flp,
- struct fib_result *res, int prefixlen);
+ struct fib_result *res, int prefixlen, int fib_flags);
extern void fib_release_info(struct fib_info *);
extern struct fib_info *fib_create_info(struct fib_config *cfg);
extern int fib_nh_match(struct fib_config *cfg, struct fib_info *fi);
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 32300521e32..7981a24f5c7 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -57,6 +57,7 @@ int fib_lookup(struct net *net, struct flowi *flp, struct fib_result *res)
{
struct fib_lookup_arg arg = {
.result = res,
+ .flags = FIB_LOOKUP_NOREF,
};
int err;
@@ -94,7 +95,7 @@ static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
if (!tbl)
goto errout;
- err = fib_table_lookup(tbl, flp, (struct fib_result *) arg->result);
+ err = fib_table_lookup(tbl, flp, (struct fib_result *) arg->result, arg->flags);
if (err > 0)
err = -EAGAIN;
errout:
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index ba52f399a89..0f80dfc2f7f 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -148,6 +148,13 @@ static const struct
/* Release a nexthop info record */
+static void free_fib_info_rcu(struct rcu_head *head)
+{
+ struct fib_info *fi = container_of(head, struct fib_info, rcu);
+
+ kfree(fi);
+}
+
void free_fib_info(struct fib_info *fi)
{
if (fi->fib_dead == 0) {
@@ -161,7 +168,7 @@ void free_fib_info(struct fib_info *fi)
} endfor_nexthops(fi);
fib_info_cnt--;
release_net(fi->fib_net);
- kfree(fi);
+ call_rcu(&fi->rcu, free_fib_info_rcu);
}
void fib_release_info(struct fib_info *fi)
@@ -553,6 +560,7 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
nh->nh_scope = RT_SCOPE_LINK;
return 0;
}
+ rcu_read_lock();
{
struct flowi fl = {
.nl_u = {
@@ -568,8 +576,10 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
if (fl.fl4_scope < RT_SCOPE_LINK)
fl.fl4_scope = RT_SCOPE_LINK;
err = fib_lookup(net, &fl, &res);
- if (err)
+ if (err) {
+ rcu_read_unlock();
return err;
+ }
}
err = -EINVAL;
if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
@@ -585,7 +595,7 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
goto out;
err = 0;
out:
- fib_res_put(&res);
+ rcu_read_unlock();
return err;
} else {
struct in_device *in_dev;
@@ -879,7 +889,7 @@ failure:
/* Note! fib_semantic_match intentionally uses RCU list functions. */
int fib_semantic_match(struct list_head *head, const struct flowi *flp,
- struct fib_result *res, int prefixlen)
+ struct fib_result *res, int prefixlen, int fib_flags)
{
struct fib_alias *fa;
int nh_sel = 0;
@@ -943,7 +953,8 @@ out_fill_res:
res->type = fa->fa_type;
res->scope = fa->fa_scope;
res->fi = fa->fa_info;
- atomic_inc(&res->fi->fib_clntref);
+ if (!(fib_flags & FIB_LOOKUP_NOREF))
+ atomic_inc(&res->fi->fib_clntref);
return 0;
}
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index a96e5ec211a..271c89bdf04 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1342,7 +1342,7 @@ err:
/* should be called with rcu_read_lock */
static int check_leaf(struct trie *t, struct leaf *l,
t_key key, const struct flowi *flp,
- struct fib_result *res)
+ struct fib_result *res, int fib_flags)
{
struct leaf_info *li;
struct hlist_head *hhead = &l->list;
@@ -1356,7 +1356,7 @@ static int check_leaf(struct trie *t, struct leaf *l,
if (l->key != (key & ntohl(mask)))
continue;
- err = fib_semantic_match(&li->falh, flp, res, plen);
+ err = fib_semantic_match(&li->falh, flp, res, plen, fib_flags);
#ifdef CONFIG_IP_FIB_TRIE_STATS
if (err <= 0)
@@ -1372,7 +1372,7 @@ static int check_leaf(struct trie *t, struct leaf *l,
}
int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
- struct fib_result *res)
+ struct fib_result *res, int fib_flags)
{
struct trie *t = (struct trie *) tb->tb_data;
int ret;
@@ -1399,7 +1399,7 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
/* Just a leaf? */
if (IS_LEAF(n)) {
- ret = check_leaf(t, (struct leaf *)n, key, flp, res);
+ ret = check_leaf(t, (struct leaf *)n, key, flp, res, fib_flags);
goto found;
}
@@ -1424,7 +1424,7 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
}
if (IS_LEAF(n)) {
- ret = check_leaf(t, (struct leaf *)n, key, flp, res);
+ ret = check_leaf(t, (struct leaf *)n, key, flp, res, fib_flags);
if (ret > 0)
goto backtrace;
goto found;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 04e0df82b88..7864d0c4896 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1773,12 +1773,15 @@ void ip_rt_get_source(u8 *addr, struct rtable *rt)
if (rt->fl.iif == 0)
src = rt->rt_src;
- else if (fib_lookup(dev_net(rt->dst.dev), &rt->fl, &res) == 0) {
- src = FIB_RES_PREFSRC(res);
- fib_res_put(&res);
- } else
- src = inet_select_addr(rt->dst.dev, rt->rt_gateway,
+ else {
+ rcu_read_lock();
+ if (fib_lookup(dev_net(rt->dst.dev), &rt->fl, &res) == 0)
+ src = FIB_RES_PREFSRC(res);
+ else
+ src = inet_select_addr(rt->dst.dev, rt->rt_gateway,
RT_SCOPE_UNIVERSE);
+ rcu_read_unlock();
+ }
memcpy(addr, &src, 4);
}
@@ -2081,6 +2084,7 @@ static int ip_mkroute_input(struct sk_buff *skb,
* Such approach solves two big problems:
* 1. Not simplex devices are handled properly.
* 2. IP spoofing attempts are filtered with 100% of guarantee.
+ * called with rcu_read_lock()
*/
static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
@@ -2102,7 +2106,6 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
unsigned hash;
__be32 spec_dst;
int err = -EINVAL;
- int free_res = 0;
struct net * net = dev_net(dev);
/* IP on this device is disabled. */
@@ -2134,12 +2137,12 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
/*
* Now we are ready to route packet.
*/
- if ((err = fib_lookup(net, &fl, &res)) != 0) {
+ err = fib_lookup(net, &fl, &res);
+ if (err != 0) {
if (!IN_DEV_FORWARD(in_dev))
goto e_hostunreach;
goto no_route;
}
- free_res = 1;
RT_CACHE_STAT_INC(in_slow_tot);
@@ -2148,8 +2151,8 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
if (res.type == RTN_LOCAL) {
err = fib_validate_source(saddr, daddr, tos,
- net->loopback_dev->ifindex,
- dev, &spec_dst, &itag, skb->mark);
+ net->loopback_dev->ifindex,
+ dev, &spec_dst, &itag, skb->mark);
if (err < 0)
goto martian_source_keep_err;
if (err)
@@ -2164,9 +2167,6 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
goto martian_destination;
err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
-done:
- if (free_res)
- fib_res_put(&res);
out: return err;
brd_input:
@@ -2226,7 +2226,7 @@ local_input:
rth->rt_type = res.type;
hash = rt_hash(daddr, saddr, fl.iif, rt_genid(net));
err = rt_intern_hash(hash, rth, NULL, skb, fl.iif);
- goto done;
+ goto out;
no_route:
RT_CACHE_STAT_INC(in_no_route);
@@ -2249,21 +2249,21 @@ martian_destination:
e_hostunreach:
err = -EHOSTUNREACH;
- goto done;
+ goto out;
e_inval:
err = -EINVAL;
- goto done;
+ goto out;
e_nobufs:
err = -ENOBUFS;
- goto done;
+ goto out;
martian_source:
err = -EINVAL;
martian_source_keep_err:
ip_handle_martian_source(dev, in_dev, skb, daddr, saddr);
- goto done;
+ goto out;
}
int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr,
@@ -2349,6 +2349,7 @@ skip_cache:
}
EXPORT_SYMBOL(ip_route_input_common);
+/* called with rcu_read_lock() */
static int __mkroute_output(struct rtable **result,
struct fib_result *res,
const struct flowi *fl,
@@ -2373,18 +2374,13 @@ static int __mkroute_output(struct rtable **result,
if (dev_out->flags & IFF_LOOPBACK)
flags |= RTCF_LOCAL;
- rcu_read_lock();
in_dev = __in_dev_get_rcu(dev_out);
- if (!in_dev) {
- rcu_read_unlock();
+ if (!in_dev)
return -EINVAL;
- }
+
if (res->type == RTN_BROADCAST) {
flags |= RTCF_BROADCAST | RTCF_LOCAL;
- if (res->fi) {
- fib_info_put(res->fi);
- res->fi = NULL;
- }
+ res->fi = NULL;
} else if (res->type == RTN_MULTICAST) {
flags |= RTCF_MULTICAST | RTCF_LOCAL;
if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src,
@@ -2394,10 +2390,8 @@ static int __mkroute_output(struct rtable **result,
* default one, but do not gateway in this case.
* Yes, it is hack.
*/
- if (res->fi && res->prefixlen < 4) {
- fib_info_put(res->fi);
+ if (res->fi && res->prefixlen < 4)
res->fi = NULL;
- }
}
@@ -2467,6 +2461,7 @@ static int __mkroute_output(struct rtable **result,
return 0;
}
+/* called with rcu_read_lock() */
static int ip_mkroute_output(struct rtable **rp,
struct fib_result *res,
const struct flowi *fl,
@@ -2509,7 +2504,6 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
struct fib_result res;
unsigned int flags = 0;
struct net_device *dev_out = NULL;
- int free_res = 0;
int err;
@@ -2636,15 +2630,12 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
err = -ENETUNREACH;
goto out;
}
- free_res = 1;
if (res.type == RTN_LOCAL) {
if (!fl.fl4_src)
fl.fl4_src = fl.fl4_dst;
dev_out = net->loopback_dev;
fl.oif = dev_out->ifindex;
- if (res.fi)
- fib_info_put(res.fi);
res.fi = NULL;
flags |= RTCF_LOCAL;
goto make_route;
@@ -2668,8 +2659,6 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
make_route:
err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags);
- if (free_res)
- fib_res_put(&res);
out: return err;
}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 14:16:32 +0000