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-rw-r--r--include/net/nexthop.h144
1 files changed, 128 insertions, 16 deletions
diff --git a/include/net/nexthop.h b/include/net/nexthop.h
index c440ccc861fc..e4b55b43e907 100644
--- a/include/net/nexthop.h
+++ b/include/net/nexthop.h
@@ -10,6 +10,7 @@
#define __LINUX_NEXTHOP_H
#include <linux/netdevice.h>
+#include <linux/notifier.h>
#include <linux/route.h>
#include <linux/types.h>
#include <net/ip_fib.h>
@@ -26,6 +27,7 @@ struct nh_config {
u8 nh_family;
u8 nh_protocol;
u8 nh_blackhole;
+ u8 nh_fdb;
u32 nh_flags;
int nh_ifindex;
@@ -52,6 +54,7 @@ struct nh_info {
u8 family;
bool reject_nh;
+ bool fdb_nh;
union {
struct fib_nh_common fib_nhc;
@@ -70,6 +73,7 @@ struct nh_grp_entry {
};
struct nh_group {
+ struct nh_group *spare; /* spare group for removals */
u16 num_nh;
bool mpath;
bool has_v4;
@@ -80,6 +84,7 @@ struct nexthop {
struct rb_node rb_node; /* entry on netns rbtree */
struct list_head fi_list; /* v4 entries using nh */
struct list_head f6i_list; /* v6 entries using nh */
+ struct list_head fdb_list; /* fdb entries using this nh */
struct list_head grp_list; /* nh group entries using this nh */
struct net *net;
@@ -88,6 +93,7 @@ struct nexthop {
u8 protocol; /* app managing this nh */
u8 nh_flags;
bool is_group;
+ bool is_fdb_nh;
refcount_t refcnt;
struct rcu_head rcu;
@@ -98,6 +104,17 @@ struct nexthop {
};
};
+enum nexthop_event_type {
+ NEXTHOP_EVENT_ADD,
+ NEXTHOP_EVENT_DEL
+};
+
+int call_nexthop_notifier(struct notifier_block *nb, struct net *net,
+ enum nexthop_event_type event_type,
+ struct nexthop *nh);
+int register_nexthop_notifier(struct net *net, struct notifier_block *nb);
+int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb);
+
/* caller is holding rcu or rtnl; no reference taken to nexthop */
struct nexthop *nexthop_find_by_id(struct net *net, u32 id);
void nexthop_free_rcu(struct rcu_head *head);
@@ -136,21 +153,20 @@ static inline unsigned int nexthop_num_path(const struct nexthop *nh)
{
unsigned int rc = 1;
- if (nexthop_is_multipath(nh)) {
+ if (nh->is_group) {
struct nh_group *nh_grp;
nh_grp = rcu_dereference_rtnl(nh->nh_grp);
- rc = nh_grp->num_nh;
+ if (nh_grp->mpath)
+ rc = nh_grp->num_nh;
}
return rc;
}
static inline
-struct nexthop *nexthop_mpath_select(const struct nexthop *nh, int nhsel)
+struct nexthop *nexthop_mpath_select(const struct nh_group *nhg, int nhsel)
{
- const struct nh_group *nhg = rcu_dereference_rtnl(nh->nh_grp);
-
/* for_nexthops macros in fib_semantics.c grabs a pointer to
* the nexthop before checking nhsel
*/
@@ -185,12 +201,14 @@ static inline bool nexthop_is_blackhole(const struct nexthop *nh)
{
const struct nh_info *nhi;
- if (nexthop_is_multipath(nh)) {
- if (nexthop_num_path(nh) > 1)
- return false;
- nh = nexthop_mpath_select(nh, 0);
- if (!nh)
+ if (nh->is_group) {
+ struct nh_group *nh_grp;
+
+ nh_grp = rcu_dereference_rtnl(nh->nh_grp);
+ if (nh_grp->num_nh > 1)
return false;
+
+ nh = nh_grp->nh_entries[0].nh;
}
nhi = rcu_dereference_rtnl(nh->nh_info);
@@ -216,16 +234,79 @@ struct fib_nh_common *nexthop_fib_nhc(struct nexthop *nh, int nhsel)
BUILD_BUG_ON(offsetof(struct fib_nh, nh_common) != 0);
BUILD_BUG_ON(offsetof(struct fib6_nh, nh_common) != 0);
- if (nexthop_is_multipath(nh)) {
- nh = nexthop_mpath_select(nh, nhsel);
- if (!nh)
- return NULL;
+ if (nh->is_group) {
+ struct nh_group *nh_grp;
+
+ nh_grp = rcu_dereference_rtnl(nh->nh_grp);
+ if (nh_grp->mpath) {
+ nh = nexthop_mpath_select(nh_grp, nhsel);
+ if (!nh)
+ return NULL;
+ }
}
nhi = rcu_dereference_rtnl(nh->nh_info);
return &nhi->fib_nhc;
}
+/* called from fib_table_lookup with rcu_lock */
+static inline
+struct fib_nh_common *nexthop_get_nhc_lookup(const struct nexthop *nh,
+ int fib_flags,
+ const struct flowi4 *flp,
+ int *nhsel)
+{
+ struct nh_info *nhi;
+
+ if (nh->is_group) {
+ struct nh_group *nhg = rcu_dereference(nh->nh_grp);
+ int i;
+
+ for (i = 0; i < nhg->num_nh; i++) {
+ struct nexthop *nhe = nhg->nh_entries[i].nh;
+
+ nhi = rcu_dereference(nhe->nh_info);
+ if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) {
+ *nhsel = i;
+ return &nhi->fib_nhc;
+ }
+ }
+ } else {
+ nhi = rcu_dereference(nh->nh_info);
+ if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) {
+ *nhsel = 0;
+ return &nhi->fib_nhc;
+ }
+ }
+
+ return NULL;
+}
+
+static inline bool nexthop_uses_dev(const struct nexthop *nh,
+ const struct net_device *dev)
+{
+ struct nh_info *nhi;
+
+ if (nh->is_group) {
+ struct nh_group *nhg = rcu_dereference(nh->nh_grp);
+ int i;
+
+ for (i = 0; i < nhg->num_nh; i++) {
+ struct nexthop *nhe = nhg->nh_entries[i].nh;
+
+ nhi = rcu_dereference(nhe->nh_info);
+ if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev))
+ return true;
+ }
+ } else {
+ nhi = rcu_dereference(nh->nh_info);
+ if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev))
+ return true;
+ }
+
+ return false;
+}
+
static inline unsigned int fib_info_num_path(const struct fib_info *fi)
{
if (unlikely(fi->nh))
@@ -263,8 +344,11 @@ static inline struct fib6_nh *nexthop_fib6_nh(struct nexthop *nh)
{
struct nh_info *nhi;
- if (nexthop_is_multipath(nh)) {
- nh = nexthop_mpath_select(nh, 0);
+ if (nh->is_group) {
+ struct nh_group *nh_grp;
+
+ nh_grp = rcu_dereference_rtnl(nh->nh_grp);
+ nh = nexthop_mpath_select(nh_grp, 0);
if (!nh)
return NULL;
}
@@ -304,4 +388,32 @@ static inline void nexthop_path_fib6_result(struct fib6_result *res, int hash)
int nexthop_for_each_fib6_nh(struct nexthop *nh,
int (*cb)(struct fib6_nh *nh, void *arg),
void *arg);
+
+static inline int nexthop_get_family(struct nexthop *nh)
+{
+ struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info);
+
+ return nhi->family;
+}
+
+static inline
+struct fib_nh_common *nexthop_fdb_nhc(struct nexthop *nh)
+{
+ struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info);
+
+ return &nhi->fib_nhc;
+}
+
+static inline struct fib_nh_common *nexthop_path_fdb_result(struct nexthop *nh,
+ int hash)
+{
+ struct nh_info *nhi;
+ struct nexthop *nhp;
+
+ nhp = nexthop_select_path(nh, hash);
+ if (unlikely(!nhp))
+ return NULL;
+ nhi = rcu_dereference(nhp->nh_info);
+ return &nhi->fib_nhc;
+}
#endif