projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * 802_3 | |
| 3 | * | |
| 4 | * Author: | |
| 5 | * Chris Vitale csv@bluetail.com | |
| 6 | * | |
| 7 | * May 2003 | |
| 8 | * | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/netfilter_bridge/ebtables.h> | |
| 12 | #include <linux/netfilter_bridge/ebt_802_3.h> | |
| 13 | #include <linux/module.h> | |
| 14 | ||
| 15 | static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *in, | |
| 16 | const struct net_device *out, const void *data, unsigned int datalen) | |
| 17 | { | |
| 18 | struct ebt_802_3_info *info = (struct ebt_802_3_info *)data; | |
| 19 | struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb); | |
| 20 | uint16_t type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type; | |
| 21 | ||
| 22 | if (info->bitmask & EBT_802_3_SAP) { | |
| 23 | if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP)) | |
| 24 | return EBT_NOMATCH; | |
| 25 | if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP)) | |
| 26 | return EBT_NOMATCH; | |
| 27 | } | |
| 28 | ||
| 29 | if (info->bitmask & EBT_802_3_TYPE) { | |
| 30 | if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE)) | |
| 31 | return EBT_NOMATCH; | |
| 32 | if (FWINV(info->type != type, EBT_802_3_TYPE)) | |
| 33 | return EBT_NOMATCH; | |
| 34 | } | |
| 35 | ||
| 36 | return EBT_MATCH; | |
| 37 | } | |
| 38 | ||
| 39 | static struct ebt_match filter_802_3; | |
| 40 | static int ebt_802_3_check(const char *tablename, unsigned int hookmask, | |
| 41 | const struct ebt_entry *e, void *data, unsigned int datalen) | |
| 42 | { | |
| 43 | struct ebt_802_3_info *info = (struct ebt_802_3_info *)data; | |
| 44 | ||
| 45 | if (datalen < sizeof(struct ebt_802_3_info)) | |
| 46 | return -EINVAL; | |
| 47 | if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK) | |
| 48 | return -EINVAL; | |
| 49 | ||
| 50 | return 0; | |
| 51 | } | |
| 52 | ||
| 53 | static struct ebt_match filter_802_3 = | |
| 54 | { | |
| 55 | .name = EBT_802_3_MATCH, | |
| 56 | .match = ebt_filter_802_3, | |
| 57 | .check = ebt_802_3_check, | |
| 58 | .me = THIS_MODULE, | |
| 59 | }; | |
| 60 | ||
| 61 | static int __init init(void) | |
| 62 | { | |
| 63 | return ebt_register_match(&filter_802_3); | |
| 64 | } | |
| 65 | ||
| 66 | static void __exit fini(void) | |
| 67 | { | |
| 68 | ebt_unregister_match(&filter_802_3); | |
| 69 | } | |
| 70 | ||
| 71 | module_init(init); | |
| 72 | module_exit(fini); | |
| 73 | MODULE_LICENSE("GPL"); |