File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
new file mode 100644
index 0000000..235c781
--- /dev/null
+++ b/include/net/inetpeer.h
@@ -0,0 +1,157 @@
+/*
+ * INETPEER - A storage for permanent information about peers
+ *
+ * Authors: Andrey V. Savochkin <saw@msu.ru>
+ */
+
+#ifndef _NET_INETPEER_H
+#define _NET_INETPEER_H
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/spinlock.h>
+#include <linux/rtnetlink.h>
+#include <net/ipv6.h>
+#include <linux/atomic.h>
+
+/* IPv4 address key for cache lookups */
+struct ipv4_addr_key {
+ __be32 addr;
+ int vif;
+};
+
+#define INETPEER_MAXKEYSZ (sizeof(struct in6_addr) / sizeof(u32))
+
+struct inetpeer_addr {
+ union {
+ struct ipv4_addr_key a4;
+ struct in6_addr a6;
+ u32 key[INETPEER_MAXKEYSZ];
+ };
+ __u16 family;
+};
+
+struct inet_peer {
+ /* group together avl_left,avl_right,v4daddr to speedup lookups */
+ struct inet_peer __rcu *avl_left, *avl_right;
+ struct inetpeer_addr daddr;
+ __u32 avl_height;
+
+ u32 metrics[RTAX_MAX];
+ u32 rate_tokens; /* rate limiting for ICMP */
+ unsigned long rate_last;
+ union {
+ struct list_head gc_list;
+ struct rcu_head gc_rcu;
+ };
+ /*
+ * Once inet_peer is queued for deletion (refcnt == -1), following field
+ * is not available: rid
+ * We can share memory with rcu_head to help keep inet_peer small.
+ */
+ union {
+ struct {
+ atomic_t rid; /* Frag reception counter */
+ };
+ struct rcu_head rcu;
+ struct inet_peer *gc_next;
+ };
+
+ /* following fields might be frequently dirtied */
+ __u32 dtime; /* the time of last use of not referenced entries */
+ atomic_t refcnt;
+};
+
+struct inet_peer_base {
+ struct inet_peer __rcu *root;
+ seqlock_t lock;
+ int total;
+};
+
+void inet_peer_base_init(struct inet_peer_base *);
+
+void inet_initpeers(void) __init;
+
+#define INETPEER_METRICS_NEW (~(u32) 0)
+
+static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip)
+{
+ iaddr->a4.addr = ip;
+ iaddr->a4.vif = 0;
+ iaddr->family = AF_INET;
+}
+
+static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr)
+{
+ return iaddr->a4.addr;
+}
+
+static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr,
+ struct in6_addr *in6)
+{
+ iaddr->a6 = *in6;
+ iaddr->family = AF_INET6;
+}
+
+static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr)
+{
+ return &iaddr->a6;
+}
+
+/* can be called with or without local BH being disabled */
+struct inet_peer *inet_getpeer(struct inet_peer_base *base,
+ const struct inetpeer_addr *daddr,
+ int create);
+
+static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
+ __be32 v4daddr,
+ int vif, int create)
+{
+ struct inetpeer_addr daddr;
+
+ daddr.a4.addr = v4daddr;
+ daddr.a4.vif = vif;
+ daddr.family = AF_INET;
+ return inet_getpeer(base, &daddr, create);
+}
+
+static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
+ const struct in6_addr *v6daddr,
+ int create)
+{
+ struct inetpeer_addr daddr;
+
+ daddr.a6 = *v6daddr;
+ daddr.family = AF_INET6;
+ return inet_getpeer(base, &daddr, create);
+}
+
+static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a,
+ const struct inetpeer_addr *b)
+{
+ int i, n;
+
+ if (a->family == AF_INET)
+ n = sizeof(a->a4) / sizeof(u32);
+ else
+ n = sizeof(a->a6) / sizeof(u32);
+
+ for (i = 0; i < n; i++) {
+ if (a->key[i] == b->key[i])
+ continue;
+ if (a->key[i] < b->key[i])
+ return -1;
+ return 1;
+ }
+
+ return 0;
+}
+
+/* can be called from BH context or outside */
+void inet_putpeer(struct inet_peer *p);
+bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
+
+void inetpeer_invalidate_tree(struct inet_peer_base *);
+
+#endif /* _NET_INETPEER_H */