projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9ba16276 | 1 | /* IP tables module for matching the value of the IPv4/IPv6 DSCP field |
| 9ba16276 YK |
2 | * |
| 3 | * (C) 2002 by Harald Welte <laforge@netfilter.org> | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License version 2 as | |
| 7 | * published by the Free Software Foundation. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/module.h> | |
| 11 | #include <linux/skbuff.h> | |
| 12 | #include <linux/ip.h> | |
| 13 | #include <linux/ipv6.h> | |
| 14 | #include <net/dsfield.h> | |
| 15 | ||
| 16 | #include <linux/netfilter/xt_dscp.h> | |
| 17 | #include <linux/netfilter/x_tables.h> | |
| 18 | ||
| 19 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
| 20 | MODULE_DESCRIPTION("x_tables DSCP matching module"); | |
| 21 | MODULE_LICENSE("GPL"); | |
| 22 | MODULE_ALIAS("ipt_dscp"); | |
| 23 | MODULE_ALIAS("ip6t_dscp"); | |
| 24 | ||
| 25 | static int match(const struct sk_buff *skb, | |
| 26 | const struct net_device *in, | |
| 27 | const struct net_device *out, | |
| 28 | const struct xt_match *match, | |
| 29 | const void *matchinfo, | |
| 30 | int offset, | |
| 31 | unsigned int protoff, | |
| 32 | int *hotdrop) | |
| 33 | { | |
| 34 | const struct xt_dscp_info *info = matchinfo; | |
| eddc9ec5 | 35 | u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT; |
| 9ba16276 YK |
36 | |
| 37 | return (dscp == info->dscp) ^ !!info->invert; | |
| 38 | } | |
| 39 | ||
| 40 | static int match6(const struct sk_buff *skb, | |
| 41 | const struct net_device *in, | |
| 42 | const struct net_device *out, | |
| 43 | const struct xt_match *match, | |
| 44 | const void *matchinfo, | |
| 45 | int offset, | |
| 46 | unsigned int protoff, | |
| 47 | int *hotdrop) | |
| 48 | { | |
| 49 | const struct xt_dscp_info *info = matchinfo; | |
| 0660e03f | 50 | u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT; |
| 9ba16276 YK |
51 | |
| 52 | return (dscp == info->dscp) ^ !!info->invert; | |
| 53 | } | |
| 54 | ||
| 55 | static int checkentry(const char *tablename, | |
| 56 | const void *info, | |
| 57 | const struct xt_match *match, | |
| 58 | void *matchinfo, | |
| 9ba16276 YK |
59 | unsigned int hook_mask) |
| 60 | { | |
| 61 | const u_int8_t dscp = ((struct xt_dscp_info *)matchinfo)->dscp; | |
| 62 | ||
| 63 | if (dscp > XT_DSCP_MAX) { | |
| 64 | printk(KERN_ERR "xt_dscp: dscp %x out of range\n", dscp); | |
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| 68 | return 1; | |
| 69 | } | |
| 70 | ||
| 4470bbc7 PM |
71 | static struct xt_match xt_dscp_match[] = { |
| 72 | { | |
| 73 | .name = "dscp", | |
| 74 | .family = AF_INET, | |
| 75 | .checkentry = checkentry, | |
| 76 | .match = match, | |
| 77 | .matchsize = sizeof(struct xt_dscp_info), | |
| 78 | .me = THIS_MODULE, | |
| 79 | }, | |
| 80 | { | |
| 81 | .name = "dscp", | |
| 82 | .family = AF_INET6, | |
| 83 | .checkentry = checkentry, | |
| 84 | .match = match6, | |
| 85 | .matchsize = sizeof(struct xt_dscp_info), | |
| 86 | .me = THIS_MODULE, | |
| 87 | }, | |
| 9ba16276 YK |
88 | }; |
| 89 | ||
| 90 | static int __init xt_dscp_match_init(void) | |
| 91 | { | |
| 4470bbc7 | 92 | return xt_register_matches(xt_dscp_match, ARRAY_SIZE(xt_dscp_match)); |
| 9ba16276 YK |
93 | } |
| 94 | ||
| 95 | static void __exit xt_dscp_match_fini(void) | |
| 96 | { | |
| 4470bbc7 | 97 | xt_unregister_matches(xt_dscp_match, ARRAY_SIZE(xt_dscp_match)); |
| 9ba16276 YK |
98 | } |
| 99 | ||
| 100 | module_init(xt_dscp_match_init); | |
| 101 | module_exit(xt_dscp_match_fini); |