projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9ba16276 YK |
1 | /* IP tables module for matching the value of the IPv4/IPv6 DSCP field |
| 2 | * | |
| 3 | * xt_dscp.c,v 1.3 2002/08/05 19:00:21 laforge Exp | |
| 4 | * | |
| 5 | * (C) 2002 by Harald Welte <laforge@netfilter.org> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/skbuff.h> | |
| 14 | #include <linux/ip.h> | |
| 15 | #include <linux/ipv6.h> | |
| 16 | #include <net/dsfield.h> | |
| 17 | ||
| 18 | #include <linux/netfilter/xt_dscp.h> | |
| 19 | #include <linux/netfilter/x_tables.h> | |
| 20 | ||
| 21 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
| 22 | MODULE_DESCRIPTION("x_tables DSCP matching module"); | |
| 23 | MODULE_LICENSE("GPL"); | |
| 24 | MODULE_ALIAS("ipt_dscp"); | |
| 25 | MODULE_ALIAS("ip6t_dscp"); | |
| 26 | ||
| 27 | static int match(const struct sk_buff *skb, | |
| 28 | const struct net_device *in, | |
| 29 | const struct net_device *out, | |
| 30 | const struct xt_match *match, | |
| 31 | const void *matchinfo, | |
| 32 | int offset, | |
| 33 | unsigned int protoff, | |
| 34 | int *hotdrop) | |
| 35 | { | |
| 36 | const struct xt_dscp_info *info = matchinfo; | |
| 37 | u_int8_t dscp = ipv4_get_dsfield(skb->nh.iph) >> XT_DSCP_SHIFT; | |
| 38 | ||
| 39 | return (dscp == info->dscp) ^ !!info->invert; | |
| 40 | } | |
| 41 | ||
| 42 | static int match6(const struct sk_buff *skb, | |
| 43 | const struct net_device *in, | |
| 44 | const struct net_device *out, | |
| 45 | const struct xt_match *match, | |
| 46 | const void *matchinfo, | |
| 47 | int offset, | |
| 48 | unsigned int protoff, | |
| 49 | int *hotdrop) | |
| 50 | { | |
| 51 | const struct xt_dscp_info *info = matchinfo; | |
| 52 | u_int8_t dscp = ipv6_get_dsfield(skb->nh.ipv6h) >> XT_DSCP_SHIFT; | |
| 53 | ||
| 54 | return (dscp == info->dscp) ^ !!info->invert; | |
| 55 | } | |
| 56 | ||
| 57 | static int checkentry(const char *tablename, | |
| 58 | const void *info, | |
| 59 | const struct xt_match *match, | |
| 60 | void *matchinfo, | |
| 61 | unsigned int matchsize, | |
| 62 | unsigned int hook_mask) | |
| 63 | { | |
| 64 | const u_int8_t dscp = ((struct xt_dscp_info *)matchinfo)->dscp; | |
| 65 | ||
| 66 | if (dscp > XT_DSCP_MAX) { | |
| 67 | printk(KERN_ERR "xt_dscp: dscp %x out of range\n", dscp); | |
| 68 | return 0; | |
| 69 | } | |
| 70 | ||
| 71 | return 1; | |
| 72 | } | |
| 73 | ||
| 74 | static struct xt_match dscp_match = { | |
| 75 | .name = "dscp", | |
| 76 | .match = match, | |
| 77 | .checkentry = checkentry, | |
| 78 | .matchsize = sizeof(struct xt_dscp_info), | |
| 79 | .family = AF_INET, | |
| 80 | .me = THIS_MODULE, | |
| 81 | }; | |
| 82 | ||
| 83 | static struct xt_match dscp6_match = { | |
| 84 | .name = "dscp", | |
| 85 | .match = match6, | |
| 86 | .checkentry = checkentry, | |
| 87 | .matchsize = sizeof(struct xt_dscp_info), | |
| 88 | .family = AF_INET6, | |
| 89 | .me = THIS_MODULE, | |
| 90 | }; | |
| 91 | ||
| 92 | static int __init xt_dscp_match_init(void) | |
| 93 | { | |
| 94 | int ret; | |
| 95 | ret = xt_register_match(&dscp_match); | |
| 96 | if (ret) | |
| 97 | return ret; | |
| 98 | ||
| 99 | ret = xt_register_match(&dscp6_match); | |
| 100 | if (ret) | |
| 101 | xt_unregister_match(&dscp_match); | |
| 102 | ||
| 103 | return ret; | |
| 104 | } | |
| 105 | ||
| 106 | static void __exit xt_dscp_match_fini(void) | |
| 107 | { | |
| 108 | xt_unregister_match(&dscp_match); | |
| 109 | xt_unregister_match(&dscp6_match); | |
| 110 | } | |
| 111 | ||
| 112 | module_init(xt_dscp_match_init); | |
| 113 | module_exit(xt_dscp_match_fini); |