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-rw-r--r--kernel/include/net/inetpeer.h174
1 files changed, 174 insertions, 0 deletions
diff --git a/kernel/include/net/inetpeer.h b/kernel/include/net/inetpeer.h
new file mode 100644
index 000000000..d5332ddce
--- /dev/null
+++ b/kernel/include/net/inetpeer.h
@@ -0,0 +1,174 @@
+/*
+ * 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>
+
+struct inetpeer_addr_base {
+ union {
+ __be32 a4;
+ __be32 a6[4];
+ struct in6_addr in6;
+ };
+};
+
+struct inetpeer_addr {
+ struct inetpeer_addr_base addr;
+ __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;
+};
+
+#define INETPEER_BASE_BIT 0x1UL
+
+static inline struct inet_peer *inetpeer_ptr(unsigned long val)
+{
+ BUG_ON(val & INETPEER_BASE_BIT);
+ return (struct inet_peer *) val;
+}
+
+static inline struct inet_peer_base *inetpeer_base_ptr(unsigned long val)
+{
+ if (!(val & INETPEER_BASE_BIT))
+ return NULL;
+ val &= ~INETPEER_BASE_BIT;
+ return (struct inet_peer_base *) val;
+}
+
+static inline bool inetpeer_ptr_is_peer(unsigned long val)
+{
+ return !(val & INETPEER_BASE_BIT);
+}
+
+static inline void __inetpeer_ptr_set_peer(unsigned long *val, struct inet_peer *peer)
+{
+ /* This implicitly clears INETPEER_BASE_BIT */
+ *val = (unsigned long) peer;
+}
+
+static inline bool inetpeer_ptr_set_peer(unsigned long *ptr, struct inet_peer *peer)
+{
+ unsigned long val = (unsigned long) peer;
+ unsigned long orig = *ptr;
+
+ if (!(orig & INETPEER_BASE_BIT) ||
+ cmpxchg(ptr, orig, val) != orig)
+ return false;
+ return true;
+}
+
+static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base)
+{
+ *ptr = (unsigned long) base | INETPEER_BASE_BIT;
+}
+
+static inline void inetpeer_transfer_peer(unsigned long *to, unsigned long *from)
+{
+ unsigned long val = *from;
+
+ *to = val;
+ if (inetpeer_ptr_is_peer(val)) {
+ struct inet_peer *peer = inetpeer_ptr(val);
+ atomic_inc(&peer->refcnt);
+ }
+}
+
+void inet_peer_base_init(struct inet_peer_base *);
+
+void inet_initpeers(void) __init;
+
+#define INETPEER_METRICS_NEW (~(u32) 0)
+
+static inline bool inet_metrics_new(const struct inet_peer *p)
+{
+ return p->metrics[RTAX_LOCK-1] == INETPEER_METRICS_NEW;
+}
+
+/* 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 create)
+{
+ struct inetpeer_addr daddr;
+
+ daddr.addr.a4 = v4daddr;
+ 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.addr.in6 = *v6daddr;
+ daddr.family = AF_INET6;
+ return inet_getpeer(base, &daddr, create);
+}
+
+/* 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 *);
+
+/*
+ * temporary check to make sure we dont access rid, tcp_ts,
+ * tcp_ts_stamp if no refcount is taken on inet_peer
+ */
+static inline void inet_peer_refcheck(const struct inet_peer *p)
+{
+ WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0);
+}
+#endif /* _NET_INETPEER_H */