5 * Manohar Castelino <manohar.r.castelino@intel.com>
6 * Kuo-Lang Tseng <kuo-lang.tseng@intel.com>
7 * Jan Engelhardt <jengelh@medozas.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>
37 ebt_ip6_mt(const struct sk_buff *skb, struct xt_action_param *par)
39 const struct ebt_ip6_info *info = par->matchinfo;
40 const struct ipv6hdr *ih6;
42 const union pkthdr *pptr;
45 ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h);
48 if (info->bitmask & EBT_IP6_TCLASS &&
49 FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS))
51 if (FWINV(ipv6_masked_addr_cmp(&ih6->saddr, &info->smsk,
52 &info->saddr), EBT_IP6_SOURCE) ||
53 FWINV(ipv6_masked_addr_cmp(&ih6->daddr, &info->dmsk,
54 &info->daddr), EBT_IP6_DEST))
56 if (info->bitmask & EBT_IP6_PROTO) {
57 uint8_t nexthdr = ih6->nexthdr;
61 offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr, &frag_off);
64 if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO))
66 if (!(info->bitmask & ( EBT_IP6_DPORT |
67 EBT_IP6_SPORT | EBT_IP6_ICMP6)))
70 /* min icmpv6 headersize is 4, so sizeof(_pkthdr) is ok. */
71 pptr = skb_header_pointer(skb, offset_ph, sizeof(_pkthdr),
75 if (info->bitmask & EBT_IP6_DPORT) {
76 u16 dst = ntohs(pptr->tcpudphdr.dst);
77 if (FWINV(dst < info->dport[0] ||
78 dst > info->dport[1], EBT_IP6_DPORT))
81 if (info->bitmask & EBT_IP6_SPORT) {
82 u16 src = ntohs(pptr->tcpudphdr.src);
83 if (FWINV(src < info->sport[0] ||
84 src > info->sport[1], EBT_IP6_SPORT))
87 if ((info->bitmask & EBT_IP6_ICMP6) &&
88 FWINV(pptr->icmphdr.type < info->icmpv6_type[0] ||
89 pptr->icmphdr.type > info->icmpv6_type[1] ||
90 pptr->icmphdr.code < info->icmpv6_code[0] ||
91 pptr->icmphdr.code > info->icmpv6_code[1],
98 static int ebt_ip6_mt_check(const struct xt_mtchk_param *par)
100 const struct ebt_entry *e = par->entryinfo;
101 struct ebt_ip6_info *info = par->matchinfo;
103 if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO)
105 if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK)
107 if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) {
108 if (info->invflags & EBT_IP6_PROTO)
110 if (info->protocol != IPPROTO_TCP &&
111 info->protocol != IPPROTO_UDP &&
112 info->protocol != IPPROTO_UDPLITE &&
113 info->protocol != IPPROTO_SCTP &&
114 info->protocol != IPPROTO_DCCP)
117 if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1])
119 if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1])
121 if (info->bitmask & EBT_IP6_ICMP6) {
122 if ((info->invflags & EBT_IP6_PROTO) ||
123 info->protocol != IPPROTO_ICMPV6)
125 if (info->icmpv6_type[0] > info->icmpv6_type[1] ||
126 info->icmpv6_code[0] > info->icmpv6_code[1])
132 static struct xt_match ebt_ip6_mt_reg __read_mostly = {
135 .family = NFPROTO_BRIDGE,
137 .checkentry = ebt_ip6_mt_check,
138 .matchsize = sizeof(struct ebt_ip6_info),
142 static int __init ebt_ip6_init(void)
144 return xt_register_match(&ebt_ip6_mt_reg);
147 static void __exit ebt_ip6_fini(void)
149 xt_unregister_match(&ebt_ip6_mt_reg);
152 module_init(ebt_ip6_init);
153 module_exit(ebt_ip6_fini);
154 MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match");
155 MODULE_AUTHOR("Kuo-Lang Tseng <kuo-lang.tseng@intel.com>");
156 MODULE_LICENSE("GPL");