d6bebca92c
add fast path for in-order fragments As the fragments are sent in order in most of OSes, such as Windows, Darwin and FreeBSD, it is likely the new fragments are at the end of the inet_frag_queue. In the fast path, we check if the skb at the end of the inet_frag_queue is the prev we expect. Signed-off-by: Changli Gao <xiaosuo@gmail.com> ---- include/net/inet_frag.h | 1 + net/ipv4/ip_fragment.c | 12 ++++++++++++ net/ipv6/reassembly.c | 11 +++++++++++ 3 files changed, 24 insertions(+) Signed-off-by: David S. Miller <davem@davemloft.net>
75 lines
2 KiB
C
75 lines
2 KiB
C
#ifndef __NET_FRAG_H__
|
|
#define __NET_FRAG_H__
|
|
|
|
struct netns_frags {
|
|
int nqueues;
|
|
atomic_t mem;
|
|
struct list_head lru_list;
|
|
|
|
/* sysctls */
|
|
int timeout;
|
|
int high_thresh;
|
|
int low_thresh;
|
|
};
|
|
|
|
struct inet_frag_queue {
|
|
struct hlist_node list;
|
|
struct netns_frags *net;
|
|
struct list_head lru_list; /* lru list member */
|
|
spinlock_t lock;
|
|
atomic_t refcnt;
|
|
struct timer_list timer; /* when will this queue expire? */
|
|
struct sk_buff *fragments; /* list of received fragments */
|
|
struct sk_buff *fragments_tail;
|
|
ktime_t stamp;
|
|
int len; /* total length of orig datagram */
|
|
int meat;
|
|
__u8 last_in; /* first/last segment arrived? */
|
|
|
|
#define INET_FRAG_COMPLETE 4
|
|
#define INET_FRAG_FIRST_IN 2
|
|
#define INET_FRAG_LAST_IN 1
|
|
};
|
|
|
|
#define INETFRAGS_HASHSZ 64
|
|
|
|
struct inet_frags {
|
|
struct hlist_head hash[INETFRAGS_HASHSZ];
|
|
rwlock_t lock;
|
|
u32 rnd;
|
|
int qsize;
|
|
int secret_interval;
|
|
struct timer_list secret_timer;
|
|
|
|
unsigned int (*hashfn)(struct inet_frag_queue *);
|
|
void (*constructor)(struct inet_frag_queue *q,
|
|
void *arg);
|
|
void (*destructor)(struct inet_frag_queue *);
|
|
void (*skb_free)(struct sk_buff *);
|
|
int (*match)(struct inet_frag_queue *q,
|
|
void *arg);
|
|
void (*frag_expire)(unsigned long data);
|
|
};
|
|
|
|
void inet_frags_init(struct inet_frags *);
|
|
void inet_frags_fini(struct inet_frags *);
|
|
|
|
void inet_frags_init_net(struct netns_frags *nf);
|
|
void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
|
|
|
|
void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
|
|
void inet_frag_destroy(struct inet_frag_queue *q,
|
|
struct inet_frags *f, int *work);
|
|
int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
|
|
struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
|
|
struct inet_frags *f, void *key, unsigned int hash)
|
|
__releases(&f->lock);
|
|
|
|
static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
|
|
{
|
|
if (atomic_dec_and_test(&q->refcnt))
|
|
inet_frag_destroy(q, f, NULL);
|
|
}
|
|
|
|
#endif
|