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Diffstat (limited to 'net/ipv4/fib_semantics.c')
-rw-r--r--net/ipv4/fib_semantics.c125
1 files changed, 96 insertions, 29 deletions
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 12d3dc3df1b..562f34cd930 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -49,7 +49,7 @@
static DEFINE_SPINLOCK(fib_info_lock);
static struct hlist_head *fib_info_hash;
static struct hlist_head *fib_info_laddrhash;
-static unsigned int fib_hash_size;
+static unsigned int fib_info_hash_size;
static unsigned int fib_info_cnt;
#define DEVINDEX_HASHBITS 8
@@ -152,6 +152,8 @@ static void free_fib_info_rcu(struct rcu_head *head)
{
struct fib_info *fi = container_of(head, struct fib_info, rcu);
+ if (fi->fib_metrics != (u32 *) dst_default_metrics)
+ kfree(fi->fib_metrics);
kfree(fi);
}
@@ -200,7 +202,7 @@ static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
#ifdef CONFIG_IP_ROUTE_MULTIPATH
nh->nh_weight != onh->nh_weight ||
#endif
-#ifdef CONFIG_NET_CLS_ROUTE
+#ifdef CONFIG_IP_ROUTE_CLASSID
nh->nh_tclassid != onh->nh_tclassid ||
#endif
((nh->nh_flags ^ onh->nh_flags) & ~RTNH_F_DEAD))
@@ -221,7 +223,7 @@ static inline unsigned int fib_devindex_hashfn(unsigned int val)
static inline unsigned int fib_info_hashfn(const struct fib_info *fi)
{
- unsigned int mask = (fib_hash_size - 1);
+ unsigned int mask = (fib_info_hash_size - 1);
unsigned int val = fi->fib_nhs;
val ^= fi->fib_protocol;
@@ -422,7 +424,7 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
nla = nla_find(attrs, attrlen, RTA_GATEWAY);
nexthop_nh->nh_gw = nla ? nla_get_be32(nla) : 0;
-#ifdef CONFIG_NET_CLS_ROUTE
+#ifdef CONFIG_IP_ROUTE_CLASSID
nla = nla_find(attrs, attrlen, RTA_FLOW);
nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0;
#endif
@@ -476,7 +478,7 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
nla = nla_find(attrs, attrlen, RTA_GATEWAY);
if (nla && nla_get_be32(nla) != nh->nh_gw)
return 1;
-#ifdef CONFIG_NET_CLS_ROUTE
+#ifdef CONFIG_IP_ROUTE_CLASSID
nla = nla_find(attrs, attrlen, RTA_FLOW);
if (nla && nla_get_u32(nla) != nh->nh_tclassid)
return 1;
@@ -613,14 +615,14 @@ out:
static inline unsigned int fib_laddr_hashfn(__be32 val)
{
- unsigned int mask = (fib_hash_size - 1);
+ unsigned int mask = (fib_info_hash_size - 1);
return ((__force u32)val ^
((__force u32)val >> 7) ^
((__force u32)val >> 14)) & mask;
}
-static struct hlist_head *fib_hash_alloc(int bytes)
+static struct hlist_head *fib_info_hash_alloc(int bytes)
{
if (bytes <= PAGE_SIZE)
return kzalloc(bytes, GFP_KERNEL);
@@ -630,7 +632,7 @@ static struct hlist_head *fib_hash_alloc(int bytes)
get_order(bytes));
}
-static void fib_hash_free(struct hlist_head *hash, int bytes)
+static void fib_info_hash_free(struct hlist_head *hash, int bytes)
{
if (!hash)
return;
@@ -641,18 +643,18 @@ static void fib_hash_free(struct hlist_head *hash, int bytes)
free_pages((unsigned long) hash, get_order(bytes));
}
-static void fib_hash_move(struct hlist_head *new_info_hash,
- struct hlist_head *new_laddrhash,
- unsigned int new_size)
+static void fib_info_hash_move(struct hlist_head *new_info_hash,
+ struct hlist_head *new_laddrhash,
+ unsigned int new_size)
{
struct hlist_head *old_info_hash, *old_laddrhash;
- unsigned int old_size = fib_hash_size;
+ unsigned int old_size = fib_info_hash_size;
unsigned int i, bytes;
spin_lock_bh(&fib_info_lock);
old_info_hash = fib_info_hash;
old_laddrhash = fib_info_laddrhash;
- fib_hash_size = new_size;
+ fib_info_hash_size = new_size;
for (i = 0; i < old_size; i++) {
struct hlist_head *head = &fib_info_hash[i];
@@ -693,8 +695,8 @@ static void fib_hash_move(struct hlist_head *new_info_hash,
spin_unlock_bh(&fib_info_lock);
bytes = old_size * sizeof(struct hlist_head *);
- fib_hash_free(old_info_hash, bytes);
- fib_hash_free(old_laddrhash, bytes);
+ fib_info_hash_free(old_info_hash, bytes);
+ fib_info_hash_free(old_laddrhash, bytes);
}
struct fib_info *fib_create_info(struct fib_config *cfg)
@@ -718,8 +720,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
#endif
err = -ENOBUFS;
- if (fib_info_cnt >= fib_hash_size) {
- unsigned int new_size = fib_hash_size << 1;
+ if (fib_info_cnt >= fib_info_hash_size) {
+ unsigned int new_size = fib_info_hash_size << 1;
struct hlist_head *new_info_hash;
struct hlist_head *new_laddrhash;
unsigned int bytes;
@@ -727,21 +729,27 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
if (!new_size)
new_size = 1;
bytes = new_size * sizeof(struct hlist_head *);
- new_info_hash = fib_hash_alloc(bytes);
- new_laddrhash = fib_hash_alloc(bytes);
+ new_info_hash = fib_info_hash_alloc(bytes);
+ new_laddrhash = fib_info_hash_alloc(bytes);
if (!new_info_hash || !new_laddrhash) {
- fib_hash_free(new_info_hash, bytes);
- fib_hash_free(new_laddrhash, bytes);
+ fib_info_hash_free(new_info_hash, bytes);
+ fib_info_hash_free(new_laddrhash, bytes);
} else
- fib_hash_move(new_info_hash, new_laddrhash, new_size);
+ fib_info_hash_move(new_info_hash, new_laddrhash, new_size);
- if (!fib_hash_size)
+ if (!fib_info_hash_size)
goto failure;
}
fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL);
if (fi == NULL)
goto failure;
+ if (cfg->fc_mx) {
+ fi->fib_metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
+ if (!fi->fib_metrics)
+ goto failure;
+ } else
+ fi->fib_metrics = (u32 *) dst_default_metrics;
fib_info_cnt++;
fi->fib_net = hold_net(net);
@@ -779,7 +787,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
goto err_inval;
if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw)
goto err_inval;
-#ifdef CONFIG_NET_CLS_ROUTE
+#ifdef CONFIG_IP_ROUTE_CLASSID
if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow)
goto err_inval;
#endif
@@ -792,7 +800,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
nh->nh_oif = cfg->fc_oif;
nh->nh_gw = cfg->fc_gw;
nh->nh_flags = cfg->fc_flags;
-#ifdef CONFIG_NET_CLS_ROUTE
+#ifdef CONFIG_IP_ROUTE_CLASSID
nh->nh_tclassid = cfg->fc_flow;
#endif
#ifdef CONFIG_IP_ROUTE_MULTIPATH
@@ -881,8 +889,9 @@ 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, int fib_flags)
+int fib_semantic_match(struct fib_table *tb, struct list_head *head,
+ const struct flowi *flp, struct fib_result *res,
+ int prefixlen, int fib_flags)
{
struct fib_alias *fa;
int nh_sel = 0;
@@ -946,6 +955,8 @@ out_fill_res:
res->type = fa->fa_type;
res->scope = fa->fa_scope;
res->fi = fa->fa_info;
+ res->table = tb;
+ res->fa_head = head;
if (!(fib_flags & FIB_LOOKUP_NOREF))
atomic_inc(&res->fi->fib_clntref);
return 0;
@@ -1002,7 +1013,7 @@ int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
if (fi->fib_nh->nh_oif)
NLA_PUT_U32(skb, RTA_OIF, fi->fib_nh->nh_oif);
-#ifdef CONFIG_NET_CLS_ROUTE
+#ifdef CONFIG_IP_ROUTE_CLASSID
if (fi->fib_nh[0].nh_tclassid)
NLA_PUT_U32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid);
#endif
@@ -1027,7 +1038,7 @@ int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
if (nh->nh_gw)
NLA_PUT_BE32(skb, RTA_GATEWAY, nh->nh_gw);
-#ifdef CONFIG_NET_CLS_ROUTE
+#ifdef CONFIG_IP_ROUTE_CLASSID
if (nh->nh_tclassid)
NLA_PUT_U32(skb, RTA_FLOW, nh->nh_tclassid);
#endif
@@ -1125,6 +1136,62 @@ int fib_sync_down_dev(struct net_device *dev, int force)
return ret;
}
+/* Must be invoked inside of an RCU protected region. */
+void fib_select_default(struct fib_result *res)
+{
+ struct fib_info *fi = NULL, *last_resort = NULL;
+ struct list_head *fa_head = res->fa_head;
+ struct fib_table *tb = res->table;
+ int order = -1, last_idx = -1;
+ struct fib_alias *fa;
+
+ list_for_each_entry_rcu(fa, fa_head, fa_list) {
+ struct fib_info *next_fi = fa->fa_info;
+
+ if (fa->fa_scope != res->scope ||
+ fa->fa_type != RTN_UNICAST)
+ continue;
+
+ if (next_fi->fib_priority > res->fi->fib_priority)
+ break;
+ if (!next_fi->fib_nh[0].nh_gw ||
+ next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK)
+ continue;
+
+ fib_alias_accessed(fa);
+
+ if (fi == NULL) {
+ if (next_fi != res->fi)
+ break;
+ } else if (!fib_detect_death(fi, order, &last_resort,
+ &last_idx, tb->tb_default)) {
+ fib_result_assign(res, fi);
+ tb->tb_default = order;
+ goto out;
+ }
+ fi = next_fi;
+ order++;
+ }
+
+ if (order <= 0 || fi == NULL) {
+ tb->tb_default = -1;
+ goto out;
+ }
+
+ if (!fib_detect_death(fi, order, &last_resort, &last_idx,
+ tb->tb_default)) {
+ fib_result_assign(res, fi);
+ tb->tb_default = order;
+ goto out;
+ }
+
+ if (last_idx >= 0)
+ fib_result_assign(res, last_resort);
+ tb->tb_default = last_idx;
+out:
+ return;
+}
+
#ifdef CONFIG_IP_ROUTE_MULTIPATH
/*
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-02 15:52:37 +0000