| | 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@medozas.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 | */ |
| | 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> |
| | 21 | #include <linux/netfilter/x_tables.h> |
| | 22 | #include <linux/netfilter_bridge/ebtables.h> |
| | 23 | #include <linux/netfilter_bridge/ebt_ip6.h> |
| | 24 | |
| | 25 | struct tcpudphdr { |
| | 26 | __be16 src; |
| | 27 | __be16 dst; |
| | 28 | }; |
| | 29 | |
| | 30 | static bool |
| | 31 | ebt_ip6_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
| | 32 | { |
| | 33 | const struct ebt_ip6_info *info = par->matchinfo; |
| | 34 | const struct ipv6hdr *ih6; |
| | 35 | struct ipv6hdr _ip6h; |
| | 36 | const struct tcpudphdr *pptr; |
| | 37 | struct tcpudphdr _ports; |
| | 38 | |
| | 39 | ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h); |
| | 40 | if (ih6 == NULL) |
| | 41 | return false; |
| | 42 | if (info->bitmask & EBT_IP6_TCLASS && |
| | 43 | FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS)) |
| | 44 | return false; |
| | 45 | if (FWINV(ipv6_masked_addr_cmp(&ih6->saddr, &info->smsk, |
| | 46 | &info->saddr), EBT_IP6_SOURCE) || |
| | 47 | FWINV(ipv6_masked_addr_cmp(&ih6->daddr, &info->dmsk, |
| | 48 | &info->daddr), EBT_IP6_DEST)) |
| | 49 | return false; |
| | 50 | if (info->bitmask & EBT_IP6_PROTO) { |
| | 51 | uint8_t nexthdr = ih6->nexthdr; |
| | 52 | int offset_ph; |
| | 53 | |
| | 54 | offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr); |
| | 55 | if (offset_ph == -1) |
| | 56 | return false; |
| | 57 | if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO)) |
| | 58 | return false; |
| | 59 | if (!(info->bitmask & EBT_IP6_DPORT) && |
| | 60 | !(info->bitmask & EBT_IP6_SPORT)) |
| | 61 | return true; |
| | 62 | pptr = skb_header_pointer(skb, offset_ph, sizeof(_ports), |
| | 63 | &_ports); |
| | 64 | if (pptr == NULL) |
| | 65 | return false; |
| | 66 | if (info->bitmask & EBT_IP6_DPORT) { |
| | 67 | u32 dst = ntohs(pptr->dst); |
| | 68 | if (FWINV(dst < info->dport[0] || |
| | 69 | dst > info->dport[1], EBT_IP6_DPORT)) |
| | 70 | return false; |
| | 71 | } |
| | 72 | if (info->bitmask & EBT_IP6_SPORT) { |
| | 73 | u32 src = ntohs(pptr->src); |
| | 74 | if (FWINV(src < info->sport[0] || |
| | 75 | src > info->sport[1], EBT_IP6_SPORT)) |
| | 76 | return false; |
| | 77 | } |
| | 78 | return true; |
| | 79 | } |
| | 80 | return true; |
| | 81 | } |
| | 82 | |
| | 83 | static int ebt_ip6_mt_check(const struct xt_mtchk_param *par) |
| | 84 | { |
| | 85 | const struct ebt_entry *e = par->entryinfo; |
| | 86 | struct ebt_ip6_info *info = par->matchinfo; |
| | 87 | |
| | 88 | if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO) |
| | 89 | return -EINVAL; |
| | 90 | if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK) |
| | 91 | return -EINVAL; |
| | 92 | if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) { |
| | 93 | if (info->invflags & EBT_IP6_PROTO) |
| | 94 | return -EINVAL; |
| | 95 | if (info->protocol != IPPROTO_TCP && |
| | 96 | info->protocol != IPPROTO_UDP && |
| | 97 | info->protocol != IPPROTO_UDPLITE && |
| | 98 | info->protocol != IPPROTO_SCTP && |
| | 99 | info->protocol != IPPROTO_DCCP) |
| | 100 | return -EINVAL; |
| | 101 | } |
| | 102 | if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1]) |
| | 103 | return -EINVAL; |
| | 104 | if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1]) |
| | 105 | return -EINVAL; |
| | 106 | return 0; |
| | 107 | } |
| | 108 | |
| | 109 | static struct xt_match ebt_ip6_mt_reg __read_mostly = { |
| | 110 | .name = "ip6", |
| | 111 | .revision = 0, |
| | 112 | .family = NFPROTO_BRIDGE, |
| | 113 | .match = ebt_ip6_mt, |
| | 114 | .checkentry = ebt_ip6_mt_check, |
| | 115 | .matchsize = sizeof(struct ebt_ip6_info), |
| | 116 | .me = THIS_MODULE, |
| | 117 | }; |
| | 118 | |
| | 119 | static int __init ebt_ip6_init(void) |
| | 120 | { |
| | 121 | return xt_register_match(&ebt_ip6_mt_reg); |
| | 122 | } |
| | 123 | |
| | 124 | static void __exit ebt_ip6_fini(void) |
| | 125 | { |
| | 126 | xt_unregister_match(&ebt_ip6_mt_reg); |
| | 127 | } |
| | 128 | |
| | 129 | module_init(ebt_ip6_init); |
| | 130 | module_exit(ebt_ip6_fini); |
| | 131 | MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match"); |
| | 132 | MODULE_AUTHOR("Kuo-Lang Tseng <kuo-lang.tseng@intel.com>"); |
| | 133 | MODULE_LICENSE("GPL"); |
git://bbs.cooldavid.org / net-next-2.6.git / blame_incremental