175 lines
4.1 KiB
C
175 lines
4.1 KiB
C
/*
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* INETPEER - A storage for permanent information about peers
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*
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* Authors: Andrey V. Savochkin <saw@msu.ru>
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*/
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#ifndef _NET_INETPEER_H
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#define _NET_INETPEER_H
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/spinlock.h>
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#include <linux/rtnetlink.h>
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#include <net/ipv6.h>
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#include <linux/atomic.h>
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struct inetpeer_addr_base {
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union {
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__be32 a4;
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__be32 a6[4];
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};
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};
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struct inetpeer_addr {
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struct inetpeer_addr_base addr;
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__u16 family;
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};
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struct inet_peer {
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/* group together avl_left,avl_right,v4daddr to speedup lookups */
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struct inet_peer __rcu *avl_left, *avl_right;
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struct inetpeer_addr daddr;
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__u32 avl_height;
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u32 metrics[RTAX_MAX];
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u32 rate_tokens; /* rate limiting for ICMP */
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unsigned long rate_last;
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union {
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struct list_head gc_list;
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struct rcu_head gc_rcu;
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};
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/*
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* Once inet_peer is queued for deletion (refcnt == -1), following field
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* is not available: rid
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* We can share memory with rcu_head to help keep inet_peer small.
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*/
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union {
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struct {
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atomic_t rid; /* Frag reception counter */
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};
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struct rcu_head rcu;
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struct inet_peer *gc_next;
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};
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/* following fields might be frequently dirtied */
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__u32 dtime; /* the time of last use of not referenced entries */
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atomic_t refcnt;
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};
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struct inet_peer_base {
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struct inet_peer __rcu *root;
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seqlock_t lock;
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u32 flush_seq;
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int total;
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};
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#define INETPEER_BASE_BIT 0x1UL
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static inline struct inet_peer *inetpeer_ptr(unsigned long val)
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{
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BUG_ON(val & INETPEER_BASE_BIT);
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return (struct inet_peer *) val;
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}
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static inline struct inet_peer_base *inetpeer_base_ptr(unsigned long val)
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{
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if (!(val & INETPEER_BASE_BIT))
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return NULL;
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val &= ~INETPEER_BASE_BIT;
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return (struct inet_peer_base *) val;
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}
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static inline bool inetpeer_ptr_is_peer(unsigned long val)
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{
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return !(val & INETPEER_BASE_BIT);
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}
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static inline void __inetpeer_ptr_set_peer(unsigned long *val, struct inet_peer *peer)
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{
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/* This implicitly clears INETPEER_BASE_BIT */
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*val = (unsigned long) peer;
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}
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static inline bool inetpeer_ptr_set_peer(unsigned long *ptr, struct inet_peer *peer)
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{
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unsigned long val = (unsigned long) peer;
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unsigned long orig = *ptr;
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if (!(orig & INETPEER_BASE_BIT) ||
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cmpxchg(ptr, orig, val) != orig)
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return false;
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return true;
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}
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static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base)
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{
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*ptr = (unsigned long) base | INETPEER_BASE_BIT;
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}
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static inline void inetpeer_transfer_peer(unsigned long *to, unsigned long *from)
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{
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unsigned long val = *from;
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*to = val;
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if (inetpeer_ptr_is_peer(val)) {
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struct inet_peer *peer = inetpeer_ptr(val);
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atomic_inc(&peer->refcnt);
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}
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}
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void inet_peer_base_init(struct inet_peer_base *);
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void inet_initpeers(void) __init;
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#define INETPEER_METRICS_NEW (~(u32) 0)
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static inline bool inet_metrics_new(const struct inet_peer *p)
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{
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return p->metrics[RTAX_LOCK-1] == INETPEER_METRICS_NEW;
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}
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/* can be called with or without local BH being disabled */
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struct inet_peer *inet_getpeer(struct inet_peer_base *base,
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const struct inetpeer_addr *daddr,
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int create);
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static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
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__be32 v4daddr,
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int create)
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{
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struct inetpeer_addr daddr;
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daddr.addr.a4 = v4daddr;
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daddr.family = AF_INET;
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return inet_getpeer(base, &daddr, create);
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}
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static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
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const struct in6_addr *v6daddr,
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int create)
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{
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struct inetpeer_addr daddr;
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*(struct in6_addr *)daddr.addr.a6 = *v6daddr;
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daddr.family = AF_INET6;
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return inet_getpeer(base, &daddr, create);
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}
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/* can be called from BH context or outside */
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void inet_putpeer(struct inet_peer *p);
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bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
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void inetpeer_invalidate_tree(struct inet_peer_base *);
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/*
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* temporary check to make sure we dont access rid, tcp_ts,
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* tcp_ts_stamp if no refcount is taken on inet_peer
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*/
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static inline void inet_peer_refcheck(const struct inet_peer *p)
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{
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WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0);
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}
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#endif /* _NET_INETPEER_H */
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