5 * Manohar Castelino <manohar.r.castelino@intel.com>
6 * Kuo-Lang Tseng <kuo-lang.tseng@intel.com>
7 * Jan Engelhardt <jengelh@computergmbh.de>
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
16 #include <linux/ipv6.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>
31 ebt_ip6_mt(const struct sk_buff *skb, const struct xt_match_param *par)
33 const struct ebt_ip6_info *info = par->matchinfo;
34 const struct ipv6hdr *ih6;
36 const struct tcpudphdr *pptr;
37 struct tcpudphdr _ports;
38 struct in6_addr tmp_addr;
41 ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h);
44 if (info->bitmask & EBT_IP6_TCLASS &&
45 FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS))
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),
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))
60 if (info->bitmask & EBT_IP6_PROTO) {
61 uint8_t nexthdr = ih6->nexthdr;
64 offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr);
67 if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO))
69 if (!(info->bitmask & EBT_IP6_DPORT) &&
70 !(info->bitmask & EBT_IP6_SPORT))
72 pptr = skb_header_pointer(skb, offset_ph, sizeof(_ports),
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))
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))
94 ebt_ip6_mt_check(const char *table, const void *entry,
95 const struct xt_match *match, void *data,
96 unsigned int hook_mask)
98 const struct ebt_entry *e = entry;
99 struct ebt_ip6_info *info = data;
101 if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO)
103 if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK)
105 if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) {
106 if (info->invflags & EBT_IP6_PROTO)
108 if (info->protocol != IPPROTO_TCP &&
109 info->protocol != IPPROTO_UDP &&
110 info->protocol != IPPROTO_UDPLITE &&
111 info->protocol != IPPROTO_SCTP &&
112 info->protocol != IPPROTO_DCCP)
115 if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1])
117 if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1])
122 static struct xt_match ebt_ip6_mt_reg __read_mostly = {
125 .family = NFPROTO_BRIDGE,
127 .checkentry = ebt_ip6_mt_check,
128 .matchsize = XT_ALIGN(sizeof(struct ebt_ip6_info)),
132 static int __init ebt_ip6_init(void)
134 return xt_register_match(&ebt_ip6_mt_reg);
137 static void __exit ebt_ip6_fini(void)
139 xt_unregister_match(&ebt_ip6_mt_reg);
142 module_init(ebt_ip6_init);
143 module_exit(ebt_ip6_fini);
144 MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match");
145 MODULE_LICENSE("GPL");