projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 1da177e4 LT |
2 | /* |
| 3 | * 802_3 | |
| 4 | * | |
| 5 | * Author: | |
| 6 | * Chris Vitale csv@bluetail.com | |
| 7 | * | |
| 8 | * May 2003 | |
| 9d6f229f | 9 | * |
| 1da177e4 | 10 | */ |
| 18219d3f JE |
11 | #include <linux/module.h> |
| 12 | #include <linux/netfilter/x_tables.h> | |
| 1da177e4 LT |
13 | #include <linux/netfilter_bridge/ebtables.h> |
| 14 | #include <linux/netfilter_bridge/ebt_802_3.h> | |
| 1da177e4 | 15 | |
| 2d06d4a5 | 16 | static bool |
| 62fc8051 | 17 | ebt_802_3_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| 1da177e4 | 18 | { |
| f7108a20 | 19 | const struct ebt_802_3_info *info = par->matchinfo; |
| abfdf1c4 | 20 | const struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb); |
| 47c183fa | 21 | __be16 type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type; |
| 1da177e4 LT |
22 | |
| 23 | if (info->bitmask & EBT_802_3_SAP) { | |
| c37a2dfa | 24 | if (NF_INVF(info, EBT_802_3_SAP, info->sap != hdr->llc.ui.ssap)) |
| 8cc784ee | 25 | return false; |
| c37a2dfa | 26 | if (NF_INVF(info, EBT_802_3_SAP, info->sap != hdr->llc.ui.dsap)) |
| 8cc784ee | 27 | return false; |
| 1da177e4 LT |
28 | } |
| 29 | ||
| 30 | if (info->bitmask & EBT_802_3_TYPE) { | |
| 31 | if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE)) | |
| 8cc784ee | 32 | return false; |
| c37a2dfa | 33 | if (NF_INVF(info, EBT_802_3_TYPE, info->type != type)) |
| 8cc784ee | 34 | return false; |
| 1da177e4 LT |
35 | } |
| 36 | ||
| 8cc784ee | 37 | return true; |
| 1da177e4 LT |
38 | } |
| 39 | ||
| b0f38452 | 40 | static int ebt_802_3_mt_check(const struct xt_mtchk_param *par) |
| 1da177e4 | 41 | { |
| 9b4fce7a | 42 | const struct ebt_802_3_info *info = par->matchinfo; |
| 1da177e4 | 43 | |
| 1da177e4 | 44 | if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK) |
| bd414ee6 | 45 | return -EINVAL; |
| 1da177e4 | 46 | |
| bd414ee6 | 47 | return 0; |
| 1da177e4 LT |
48 | } |
| 49 | ||
| 043ef46c JE |
50 | static struct xt_match ebt_802_3_mt_reg __read_mostly = { |
| 51 | .name = "802_3", | |
| 001a18d3 JE |
52 | .revision = 0, |
| 53 | .family = NFPROTO_BRIDGE, | |
| 2d06d4a5 JE |
54 | .match = ebt_802_3_mt, |
| 55 | .checkentry = ebt_802_3_mt_check, | |
| fc0e3df4 | 56 | .matchsize = sizeof(struct ebt_802_3_info), |
| 1da177e4 LT |
57 | .me = THIS_MODULE, |
| 58 | }; | |
| 59 | ||
| 65b4b4e8 | 60 | static int __init ebt_802_3_init(void) |
| 1da177e4 | 61 | { |
| 043ef46c | 62 | return xt_register_match(&ebt_802_3_mt_reg); |
| 1da177e4 LT |
63 | } |
| 64 | ||
| 65b4b4e8 | 65 | static void __exit ebt_802_3_fini(void) |
| 1da177e4 | 66 | { |
| 043ef46c | 67 | xt_unregister_match(&ebt_802_3_mt_reg); |
| 1da177e4 LT |
68 | } |
| 69 | ||
| 65b4b4e8 AM |
70 | module_init(ebt_802_3_init); |
| 71 | module_exit(ebt_802_3_fini); | |
| f776c4cd | 72 | MODULE_DESCRIPTION("Ebtables: DSAP/SSAP field and SNAP type matching"); |
| 1da177e4 | 73 | MODULE_LICENSE("GPL"); |