projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a468701d YK |
1 | /* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8 |
| 2 | * | |
| 3 | * (C) 2002 by Harald Welte <laforge@netfilter.org> | |
| 4 | * based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * See RFC2474 for a description of the DSCP field within the IP Header. | |
| 11 | * | |
| 12 | * xt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/module.h> | |
| 16 | #include <linux/skbuff.h> | |
| 17 | #include <linux/ip.h> | |
| 18 | #include <linux/ipv6.h> | |
| 19 | #include <net/dsfield.h> | |
| 20 | ||
| 21 | #include <linux/netfilter/x_tables.h> | |
| 22 | #include <linux/netfilter/xt_DSCP.h> | |
| 23 | ||
| 24 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
| 25 | MODULE_DESCRIPTION("x_tables DSCP modification module"); | |
| 26 | MODULE_LICENSE("GPL"); | |
| 27 | MODULE_ALIAS("ipt_DSCP"); | |
| 28 | MODULE_ALIAS("ip6t_DSCP"); | |
| 29 | ||
| 30 | static unsigned int target(struct sk_buff **pskb, | |
| 31 | const struct net_device *in, | |
| 32 | const struct net_device *out, | |
| 33 | unsigned int hooknum, | |
| 34 | const struct xt_target *target, | |
| 35 | const void *targinfo, | |
| 36 | void *userinfo) | |
| 37 | { | |
| 38 | const struct xt_DSCP_info *dinfo = targinfo; | |
| 39 | u_int8_t dscp = ipv4_get_dsfield((*pskb)->nh.iph) >> XT_DSCP_SHIFT; | |
| 40 | ||
| 41 | if (dscp != dinfo->dscp) { | |
| 42 | if (!skb_make_writable(pskb, sizeof(struct iphdr))) | |
| 43 | return NF_DROP; | |
| 44 | ||
| 45 | ipv4_change_dsfield((*pskb)->nh.iph, (__u8)(~XT_DSCP_MASK), | |
| 46 | dinfo->dscp << XT_DSCP_SHIFT); | |
| 47 | ||
| 48 | } | |
| 49 | return XT_CONTINUE; | |
| 50 | } | |
| 51 | ||
| 52 | static unsigned int target6(struct sk_buff **pskb, | |
| 53 | const struct net_device *in, | |
| 54 | const struct net_device *out, | |
| 55 | unsigned int hooknum, | |
| 56 | const struct xt_target *target, | |
| 57 | const void *targinfo, | |
| 58 | void *userinfo) | |
| 59 | { | |
| 60 | const struct xt_DSCP_info *dinfo = targinfo; | |
| 61 | u_int8_t dscp = ipv6_get_dsfield((*pskb)->nh.ipv6h) >> XT_DSCP_SHIFT; | |
| 62 | ||
| 63 | if (dscp != dinfo->dscp) { | |
| 64 | if (!skb_make_writable(pskb, sizeof(struct ipv6hdr))) | |
| 65 | return NF_DROP; | |
| 66 | ||
| 67 | ipv6_change_dsfield((*pskb)->nh.ipv6h, (__u8)(~XT_DSCP_MASK), | |
| 68 | dinfo->dscp << XT_DSCP_SHIFT); | |
| 69 | } | |
| 70 | return XT_CONTINUE; | |
| 71 | } | |
| 72 | ||
| 73 | static int checkentry(const char *tablename, | |
| 74 | const void *e_void, | |
| 75 | const struct xt_target *target, | |
| 76 | void *targinfo, | |
| 77 | unsigned int targinfosize, | |
| 78 | unsigned int hook_mask) | |
| 79 | { | |
| 80 | const u_int8_t dscp = ((struct xt_DSCP_info *)targinfo)->dscp; | |
| 81 | ||
| 82 | if ((dscp > XT_DSCP_MAX)) { | |
| 83 | printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp); | |
| 84 | return 0; | |
| 85 | } | |
| 86 | return 1; | |
| 87 | } | |
| 88 | ||
| 89 | static struct xt_target xt_dscp_reg = { | |
| 90 | .name = "DSCP", | |
| 91 | .target = target, | |
| 92 | .targetsize = sizeof(struct xt_DSCP_info), | |
| 93 | .table = "mangle", | |
| 94 | .checkentry = checkentry, | |
| 95 | .family = AF_INET, | |
| 96 | .me = THIS_MODULE, | |
| 97 | }; | |
| 98 | ||
| 99 | static struct xt_target xt_dscp6_reg = { | |
| 100 | .name = "DSCP", | |
| 101 | .target = target6, | |
| 102 | .targetsize = sizeof(struct xt_DSCP_info), | |
| 103 | .table = "mangle", | |
| 104 | .checkentry = checkentry, | |
| 105 | .family = AF_INET6, | |
| 106 | .me = THIS_MODULE, | |
| 107 | }; | |
| 108 | ||
| 109 | static int __init xt_dscp_target_init(void) | |
| 110 | { | |
| 111 | int ret; | |
| 112 | ret = xt_register_target(&xt_dscp_reg); | |
| 113 | if (ret) | |
| 114 | return ret; | |
| 115 | ||
| 116 | ret = xt_register_target(&xt_dscp6_reg); | |
| 117 | if (ret) | |
| 118 | xt_unregister_target(&xt_dscp_reg); | |
| 119 | ||
| 120 | return ret; | |
| 121 | } | |
| 122 | ||
| 123 | static void __exit xt_dscp_target_fini(void) | |
| 124 | { | |
| 125 | xt_unregister_target(&xt_dscp_reg); | |
| 126 | xt_unregister_target(&xt_dscp6_reg); | |
| 127 | } | |
| 128 | ||
| 129 | module_init(xt_dscp_target_init); | |
| 130 | module_exit(xt_dscp_target_fini); |