projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * 802_3 | |
| 3 | * | |
| 4 | * Author: | |
| 5 | * Chris Vitale csv@bluetail.com | |
| 6 | * | |
| 7 | * May 2003 | |
| 9d6f229f | 8 | * |
| 1da177e4 | 9 | */ |
| 18219d3f JE |
10 | #include <linux/module.h> |
| 11 | #include <linux/netfilter/x_tables.h> | |
| 1da177e4 LT |
12 | #include <linux/netfilter_bridge/ebtables.h> |
| 13 | #include <linux/netfilter_bridge/ebt_802_3.h> | |
| 1da177e4 | 14 | |
| 2d06d4a5 | 15 | static bool |
| f7108a20 | 16 | ebt_802_3_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
| 1da177e4 | 17 | { |
| f7108a20 | 18 | const struct ebt_802_3_info *info = par->matchinfo; |
| abfdf1c4 | 19 | const struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb); |
| 47c183fa | 20 | __be16 type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type; |
| 1da177e4 LT |
21 | |
| 22 | if (info->bitmask & EBT_802_3_SAP) { | |
| 9d6f229f | 23 | if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP)) |
| 8cc784ee | 24 | return false; |
| 1da177e4 | 25 | if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP)) |
| 8cc784ee | 26 | return false; |
| 1da177e4 LT |
27 | } |
| 28 | ||
| 29 | if (info->bitmask & EBT_802_3_TYPE) { | |
| 30 | if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE)) | |
| 8cc784ee | 31 | return false; |
| 9d6f229f | 32 | if (FWINV(info->type != type, EBT_802_3_TYPE)) |
| 8cc784ee | 33 | return false; |
| 1da177e4 LT |
34 | } |
| 35 | ||
| 8cc784ee | 36 | return true; |
| 1da177e4 LT |
37 | } |
| 38 | ||
| 2d06d4a5 JE |
39 | static bool |
| 40 | ebt_802_3_mt_check(const char *table, const void *entry, | |
| 41 | const struct xt_match *match, void *data, | |
| 42 | unsigned int hook_mask) | |
| 1da177e4 | 43 | { |
| abfdf1c4 | 44 | const struct ebt_802_3_info *info = data; |
| 1da177e4 | 45 | |
| 1da177e4 | 46 | if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK) |
| 19eda879 | 47 | return false; |
| 1da177e4 | 48 | |
| 19eda879 | 49 | return true; |
| 1da177e4 LT |
50 | } |
| 51 | ||
| 043ef46c JE |
52 | static struct xt_match ebt_802_3_mt_reg __read_mostly = { |
| 53 | .name = "802_3", | |
| 001a18d3 JE |
54 | .revision = 0, |
| 55 | .family = NFPROTO_BRIDGE, | |
| 2d06d4a5 JE |
56 | .match = ebt_802_3_mt, |
| 57 | .checkentry = ebt_802_3_mt_check, | |
| 18219d3f | 58 | .matchsize = XT_ALIGN(sizeof(struct ebt_802_3_info)), |
| 1da177e4 LT |
59 | .me = THIS_MODULE, |
| 60 | }; | |
| 61 | ||
| 65b4b4e8 | 62 | static int __init ebt_802_3_init(void) |
| 1da177e4 | 63 | { |
| 043ef46c | 64 | return xt_register_match(&ebt_802_3_mt_reg); |
| 1da177e4 LT |
65 | } |
| 66 | ||
| 65b4b4e8 | 67 | static void __exit ebt_802_3_fini(void) |
| 1da177e4 | 68 | { |
| 043ef46c | 69 | xt_unregister_match(&ebt_802_3_mt_reg); |
| 1da177e4 LT |
70 | } |
| 71 | ||
| 65b4b4e8 AM |
72 | module_init(ebt_802_3_init); |
| 73 | module_exit(ebt_802_3_fini); | |
| f776c4cd | 74 | MODULE_DESCRIPTION("Ebtables: DSAP/SSAP field and SNAP type matching"); |
| 1da177e4 | 75 | MODULE_LICENSE("GPL"); |