projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * net/sched/em_u32.c U32 Ematch | |
| 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: Thomas Graf <[email protected]> | |
| 10 | * Alexey Kuznetsov, <[email protected]> | |
| 11 | * | |
| 12 | * Based on net/sched/cls_u32.c | |
| 13 | */ | |
| 14 | ||
| 1da177e4 LT |
15 | #include <linux/module.h> |
| 16 | #include <linux/types.h> | |
| 17 | #include <linux/kernel.h> | |
| 18 | #include <linux/skbuff.h> | |
| 19 | #include <net/pkt_cls.h> | |
| 20 | ||
| 21 | static int em_u32_match(struct sk_buff *skb, struct tcf_ematch *em, | |
| 22 | struct tcf_pkt_info *info) | |
| 23 | { | |
| 24 | struct tc_u32_key *key = (struct tc_u32_key *) em->data; | |
| 25 | unsigned char *ptr = skb->nh.raw; | |
| 26 | ||
| 27 | if (info) { | |
| 28 | if (info->ptr) | |
| 29 | ptr = info->ptr; | |
| 30 | ptr += (info->nexthdr & key->offmask); | |
| 31 | } | |
| 32 | ||
| 33 | ptr += key->off; | |
| 34 | ||
| 35 | if (!tcf_valid_offset(skb, ptr, sizeof(u32))) | |
| 36 | return 0; | |
| 37 | ||
| 38 | return !(((*(u32*) ptr) ^ key->val) & key->mask); | |
| 39 | } | |
| 40 | ||
| 41 | static struct tcf_ematch_ops em_u32_ops = { | |
| 42 | .kind = TCF_EM_U32, | |
| 43 | .datalen = sizeof(struct tc_u32_key), | |
| 44 | .match = em_u32_match, | |
| 45 | .owner = THIS_MODULE, | |
| 46 | .link = LIST_HEAD_INIT(em_u32_ops.link) | |
| 47 | }; | |
| 48 | ||
| 49 | static int __init init_em_u32(void) | |
| 50 | { | |
| 51 | return tcf_em_register(&em_u32_ops); | |
| 52 | } | |
| 53 | ||
| 54 | static void __exit exit_em_u32(void) | |
| 55 | { | |
| 56 | tcf_em_unregister(&em_u32_ops); | |
| 57 | } | |
| 58 | ||
| 59 | MODULE_LICENSE("GPL"); | |
| 60 | ||
| 61 | module_init(init_em_u32); | |
| 62 | module_exit(exit_em_u32); |