diff options
Diffstat (limited to 'net/ipv4/inet_fragment.c')
| -rw-r--r-- | net/ipv4/inet_fragment.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c index 534eaa8cdcf..ec10e05c666 100644 --- a/net/ipv4/inet_fragment.c +++ b/net/ipv4/inet_fragment.c @@ -16,9 +16,38 @@ #include <linux/module.h> #include <linux/timer.h> #include <linux/mm.h> +#include <linux/random.h> #include <net/inet_frag.h> +static void inet_frag_secret_rebuild(unsigned long dummy) +{ + struct inet_frags *f = (struct inet_frags *)dummy; + unsigned long now = jiffies; + int i; + + write_lock(&f->lock); + get_random_bytes(&f->rnd, sizeof(u32)); + for (i = 0; i < INETFRAGS_HASHSZ; i++) { + struct inet_frag_queue *q; + struct hlist_node *p, *n; + + hlist_for_each_entry_safe(q, p, n, &f->hash[i], list) { + unsigned int hval = f->hashfn(q); + + if (hval != i) { + hlist_del(&q->list); + + /* Relink to new hash chain. */ + hlist_add_head(&q->list, &f->hash[hval]); + } + } + } + write_unlock(&f->lock); + + mod_timer(&f->secret_timer, now + f->ctl->secret_interval); +} + void inet_frags_init(struct inet_frags *f) { int i; @@ -35,11 +64,17 @@ void inet_frags_init(struct inet_frags *f) f->nqueues = 0; atomic_set(&f->mem, 0); + init_timer(&f->secret_timer); + f->secret_timer.function = inet_frag_secret_rebuild; + f->secret_timer.data = (unsigned long)f; + f->secret_timer.expires = jiffies + f->ctl->secret_interval; + add_timer(&f->secret_timer); } EXPORT_SYMBOL(inet_frags_init); void inet_frags_fini(struct inet_frags *f) { + del_timer(&f->secret_timer); } EXPORT_SYMBOL(inet_frags_fini); |