Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 1 | /* |
| 2 | * inet fragments management |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Pavel Emelyanov <xemul@openvz.org> |
| 10 | * Started as consolidation of ipv4/ip_fragment.c, |
| 11 | * ipv6/reassembly. and ipv6 nf conntrack reassembly |
| 12 | */ |
| 13 | |
| 14 | #include <linux/list.h> |
| 15 | #include <linux/spinlock.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/timer.h> |
| 18 | #include <linux/mm.h> |
| 19 | |
| 20 | #include <net/inet_frag.h> |
| 21 | |
| 22 | void inet_frags_init(struct inet_frags *f) |
| 23 | { |
| 24 | int i; |
| 25 | |
| 26 | for (i = 0; i < INETFRAGS_HASHSZ; i++) |
| 27 | INIT_HLIST_HEAD(&f->hash[i]); |
| 28 | |
| 29 | INIT_LIST_HEAD(&f->lru_list); |
| 30 | rwlock_init(&f->lock); |
| 31 | |
| 32 | f->rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^ |
| 33 | (jiffies ^ (jiffies >> 6))); |
| 34 | |
| 35 | f->nqueues = 0; |
| 36 | atomic_set(&f->mem, 0); |
| 37 | |
| 38 | } |
| 39 | EXPORT_SYMBOL(inet_frags_init); |
| 40 | |
| 41 | void inet_frags_fini(struct inet_frags *f) |
| 42 | { |
| 43 | } |
| 44 | EXPORT_SYMBOL(inet_frags_fini); |
Pavel Emelyanov | 277e650 | 2007-10-15 02:37:18 -0700 | [diff] [blame^] | 45 | |
| 46 | static inline void fq_unlink(struct inet_frag_queue *fq, struct inet_frags *f) |
| 47 | { |
| 48 | write_lock(&f->lock); |
| 49 | hlist_del(&fq->list); |
| 50 | list_del(&fq->lru_list); |
| 51 | f->nqueues--; |
| 52 | write_unlock(&f->lock); |
| 53 | } |
| 54 | |
| 55 | void inet_frag_kill(struct inet_frag_queue *fq, struct inet_frags *f) |
| 56 | { |
| 57 | if (del_timer(&fq->timer)) |
| 58 | atomic_dec(&fq->refcnt); |
| 59 | |
| 60 | if (!(fq->last_in & COMPLETE)) { |
| 61 | fq_unlink(fq, f); |
| 62 | atomic_dec(&fq->refcnt); |
| 63 | fq->last_in |= COMPLETE; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | EXPORT_SYMBOL(inet_frag_kill); |