Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ebt_ip6 |
| 3 | * |
| 4 | * Authors: |
| 5 | * Manohar Castelino <manohar.r.castelino@intel.com> |
| 6 | * Kuo-Lang Tseng <kuo-lang.tseng@intel.com> |
| 7 | * Jan Engelhardt <jengelh@computergmbh.de> |
| 8 | * |
| 9 | * Summary: |
| 10 | * This is just a modification of the IPv4 code written by |
| 11 | * Bart De Schuymer <bdschuym@pandora.be> |
| 12 | * with the changes required to support IPv6 |
| 13 | * |
| 14 | * Jan, 2008 |
| 15 | */ |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 16 | #include <linux/ipv6.h> |
| 17 | #include <net/ipv6.h> |
| 18 | #include <linux/in.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <net/dsfield.h> |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 21 | #include <linux/netfilter/x_tables.h> |
| 22 | #include <linux/netfilter_bridge/ebtables.h> |
| 23 | #include <linux/netfilter_bridge/ebt_ip6.h> |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 24 | |
| 25 | struct tcpudphdr { |
| 26 | __be16 src; |
| 27 | __be16 dst; |
| 28 | }; |
| 29 | |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 30 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 31 | ebt_ip6_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 32 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 33 | const struct ebt_ip6_info *info = par->matchinfo; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 34 | const struct ipv6hdr *ih6; |
| 35 | struct ipv6hdr _ip6h; |
| 36 | const struct tcpudphdr *pptr; |
| 37 | struct tcpudphdr _ports; |
| 38 | struct in6_addr tmp_addr; |
| 39 | int i; |
| 40 | |
| 41 | ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h); |
| 42 | if (ih6 == NULL) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 43 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 44 | if (info->bitmask & EBT_IP6_TCLASS && |
| 45 | FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS)) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 46 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 47 | for (i = 0; i < 4; i++) |
| 48 | tmp_addr.in6_u.u6_addr32[i] = ih6->saddr.in6_u.u6_addr32[i] & |
| 49 | info->smsk.in6_u.u6_addr32[i]; |
| 50 | if (info->bitmask & EBT_IP6_SOURCE && |
| 51 | FWINV((ipv6_addr_cmp(&tmp_addr, &info->saddr) != 0), |
| 52 | EBT_IP6_SOURCE)) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 53 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 54 | for (i = 0; i < 4; i++) |
| 55 | tmp_addr.in6_u.u6_addr32[i] = ih6->daddr.in6_u.u6_addr32[i] & |
| 56 | info->dmsk.in6_u.u6_addr32[i]; |
| 57 | if (info->bitmask & EBT_IP6_DEST && |
| 58 | FWINV((ipv6_addr_cmp(&tmp_addr, &info->daddr) != 0), EBT_IP6_DEST)) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 59 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 60 | if (info->bitmask & EBT_IP6_PROTO) { |
| 61 | uint8_t nexthdr = ih6->nexthdr; |
| 62 | int offset_ph; |
| 63 | |
| 64 | offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr); |
| 65 | if (offset_ph == -1) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 66 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 67 | if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO)) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 68 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 69 | if (!(info->bitmask & EBT_IP6_DPORT) && |
| 70 | !(info->bitmask & EBT_IP6_SPORT)) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 71 | return true; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 72 | pptr = skb_header_pointer(skb, offset_ph, sizeof(_ports), |
| 73 | &_ports); |
| 74 | if (pptr == NULL) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 75 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 76 | if (info->bitmask & EBT_IP6_DPORT) { |
| 77 | u32 dst = ntohs(pptr->dst); |
| 78 | if (FWINV(dst < info->dport[0] || |
| 79 | dst > info->dport[1], EBT_IP6_DPORT)) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 80 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 81 | } |
| 82 | if (info->bitmask & EBT_IP6_SPORT) { |
| 83 | u32 src = ntohs(pptr->src); |
| 84 | if (FWINV(src < info->sport[0] || |
| 85 | src > info->sport[1], EBT_IP6_SPORT)) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 86 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 87 | } |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 88 | return true; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 89 | } |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 90 | return true; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 91 | } |
| 92 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 93 | static bool ebt_ip6_mt_check(const struct xt_mtchk_param *par) |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 94 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 95 | const struct ebt_entry *e = par->entryinfo; |
| 96 | struct ebt_ip6_info *info = par->matchinfo; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 97 | |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 98 | if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 99 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 100 | if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 101 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 102 | if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) { |
| 103 | if (info->invflags & EBT_IP6_PROTO) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 104 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 105 | if (info->protocol != IPPROTO_TCP && |
| 106 | info->protocol != IPPROTO_UDP && |
| 107 | info->protocol != IPPROTO_UDPLITE && |
| 108 | info->protocol != IPPROTO_SCTP && |
| 109 | info->protocol != IPPROTO_DCCP) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 110 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 111 | } |
| 112 | if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1]) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 113 | return false; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 114 | if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1]) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 115 | return false; |
| 116 | return true; |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 117 | } |
| 118 | |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 119 | static struct xt_match ebt_ip6_mt_reg __read_mostly = { |
| 120 | .name = "ip6", |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame] | 121 | .revision = 0, |
| 122 | .family = NFPROTO_BRIDGE, |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 123 | .match = ebt_ip6_mt, |
| 124 | .checkentry = ebt_ip6_mt_check, |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 125 | .matchsize = XT_ALIGN(sizeof(struct ebt_ip6_info)), |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 126 | .me = THIS_MODULE, |
| 127 | }; |
| 128 | |
| 129 | static int __init ebt_ip6_init(void) |
| 130 | { |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 131 | return xt_register_match(&ebt_ip6_mt_reg); |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | static void __exit ebt_ip6_fini(void) |
| 135 | { |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 136 | xt_unregister_match(&ebt_ip6_mt_reg); |
Kuo-lang Tseng | 93f6515 | 2008-06-09 15:55:45 -0700 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | module_init(ebt_ip6_init); |
| 140 | module_exit(ebt_ip6_fini); |
| 141 | MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match"); |
| 142 | MODULE_LICENSE("GPL"); |