Commit | Line | Data |
---|---|---|
93f65158 KT |
1 | /* |
2 | * ebt_ip6 | |
3 | * | |
4 | * Authors: | |
5 | * Manohar Castelino <manohar.r.castelino@intel.com> | |
6 | * Kuo-Lang Tseng <kuo-lang.tseng@intel.com> | |
408ffaa4 | 7 | * Jan Engelhardt <jengelh@medozas.de> |
93f65158 KT |
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 | */ | |
93f65158 KT |
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> | |
18219d3f JE |
21 | #include <linux/netfilter/x_tables.h> |
22 | #include <linux/netfilter_bridge/ebtables.h> | |
23 | #include <linux/netfilter_bridge/ebt_ip6.h> | |
93f65158 | 24 | |
6faee60a FW |
25 | union pkthdr { |
26 | struct { | |
27 | __be16 src; | |
28 | __be16 dst; | |
29 | } tcpudphdr; | |
30 | struct { | |
31 | u8 type; | |
32 | u8 code; | |
33 | } icmphdr; | |
93f65158 KT |
34 | }; |
35 | ||
2d06d4a5 | 36 | static bool |
62fc8051 | 37 | ebt_ip6_mt(const struct sk_buff *skb, struct xt_action_param *par) |
93f65158 | 38 | { |
f7108a20 | 39 | const struct ebt_ip6_info *info = par->matchinfo; |
93f65158 KT |
40 | const struct ipv6hdr *ih6; |
41 | struct ipv6hdr _ip6h; | |
6faee60a FW |
42 | const union pkthdr *pptr; |
43 | union pkthdr _pkthdr; | |
93f65158 KT |
44 | |
45 | ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h); | |
46 | if (ih6 == NULL) | |
8cc784ee | 47 | return false; |
93f65158 KT |
48 | if (info->bitmask & EBT_IP6_TCLASS && |
49 | FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS)) | |
8cc784ee | 50 | return false; |
0898f99a YH |
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)) | |
8cc784ee | 55 | return false; |
93f65158 KT |
56 | if (info->bitmask & EBT_IP6_PROTO) { |
57 | uint8_t nexthdr = ih6->nexthdr; | |
58 | int offset_ph; | |
59 | ||
60 | offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr); | |
61 | if (offset_ph == -1) | |
8cc784ee | 62 | return false; |
93f65158 | 63 | if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO)) |
8cc784ee | 64 | return false; |
6faee60a FW |
65 | if (!(info->bitmask & ( EBT_IP6_DPORT | |
66 | EBT_IP6_SPORT | EBT_IP6_ICMP6))) | |
8cc784ee | 67 | return true; |
6faee60a FW |
68 | |
69 | /* min icmpv6 headersize is 4, so sizeof(_pkthdr) is ok. */ | |
70 | pptr = skb_header_pointer(skb, offset_ph, sizeof(_pkthdr), | |
71 | &_pkthdr); | |
93f65158 | 72 | if (pptr == NULL) |
8cc784ee | 73 | return false; |
93f65158 | 74 | if (info->bitmask & EBT_IP6_DPORT) { |
6faee60a | 75 | u16 dst = ntohs(pptr->tcpudphdr.dst); |
93f65158 KT |
76 | if (FWINV(dst < info->dport[0] || |
77 | dst > info->dport[1], EBT_IP6_DPORT)) | |
8cc784ee | 78 | return false; |
93f65158 KT |
79 | } |
80 | if (info->bitmask & EBT_IP6_SPORT) { | |
6faee60a | 81 | u16 src = ntohs(pptr->tcpudphdr.src); |
93f65158 KT |
82 | if (FWINV(src < info->sport[0] || |
83 | src > info->sport[1], EBT_IP6_SPORT)) | |
8cc784ee | 84 | return false; |
93f65158 | 85 | } |
6faee60a FW |
86 | if ((info->bitmask & EBT_IP6_ICMP6) && |
87 | FWINV(pptr->icmphdr.type < info->icmpv6_type[0] || | |
88 | pptr->icmphdr.type > info->icmpv6_type[1] || | |
89 | pptr->icmphdr.code < info->icmpv6_code[0] || | |
90 | pptr->icmphdr.code > info->icmpv6_code[1], | |
91 | EBT_IP6_ICMP6)) | |
92 | return false; | |
93f65158 | 93 | } |
8cc784ee | 94 | return true; |
93f65158 KT |
95 | } |
96 | ||
b0f38452 | 97 | static int ebt_ip6_mt_check(const struct xt_mtchk_param *par) |
93f65158 | 98 | { |
9b4fce7a JE |
99 | const struct ebt_entry *e = par->entryinfo; |
100 | struct ebt_ip6_info *info = par->matchinfo; | |
93f65158 | 101 | |
93f65158 | 102 | if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO) |
bd414ee6 | 103 | return -EINVAL; |
93f65158 | 104 | if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK) |
bd414ee6 | 105 | return -EINVAL; |
93f65158 KT |
106 | if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) { |
107 | if (info->invflags & EBT_IP6_PROTO) | |
bd414ee6 | 108 | return -EINVAL; |
93f65158 KT |
109 | if (info->protocol != IPPROTO_TCP && |
110 | info->protocol != IPPROTO_UDP && | |
111 | info->protocol != IPPROTO_UDPLITE && | |
112 | info->protocol != IPPROTO_SCTP && | |
113 | info->protocol != IPPROTO_DCCP) | |
bd414ee6 | 114 | return -EINVAL; |
93f65158 KT |
115 | } |
116 | if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1]) | |
bd414ee6 | 117 | return -EINVAL; |
93f65158 | 118 | if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1]) |
bd414ee6 | 119 | return -EINVAL; |
6faee60a FW |
120 | if (info->bitmask & EBT_IP6_ICMP6) { |
121 | if ((info->invflags & EBT_IP6_PROTO) || | |
122 | info->protocol != IPPROTO_ICMPV6) | |
123 | return -EINVAL; | |
124 | if (info->icmpv6_type[0] > info->icmpv6_type[1] || | |
125 | info->icmpv6_code[0] > info->icmpv6_code[1]) | |
126 | return -EINVAL; | |
127 | } | |
bd414ee6 | 128 | return 0; |
93f65158 KT |
129 | } |
130 | ||
043ef46c JE |
131 | static struct xt_match ebt_ip6_mt_reg __read_mostly = { |
132 | .name = "ip6", | |
001a18d3 JE |
133 | .revision = 0, |
134 | .family = NFPROTO_BRIDGE, | |
2d06d4a5 JE |
135 | .match = ebt_ip6_mt, |
136 | .checkentry = ebt_ip6_mt_check, | |
fc0e3df4 | 137 | .matchsize = sizeof(struct ebt_ip6_info), |
93f65158 KT |
138 | .me = THIS_MODULE, |
139 | }; | |
140 | ||
141 | static int __init ebt_ip6_init(void) | |
142 | { | |
043ef46c | 143 | return xt_register_match(&ebt_ip6_mt_reg); |
93f65158 KT |
144 | } |
145 | ||
146 | static void __exit ebt_ip6_fini(void) | |
147 | { | |
043ef46c | 148 | xt_unregister_match(&ebt_ip6_mt_reg); |
93f65158 KT |
149 | } |
150 | ||
151 | module_init(ebt_ip6_init); | |
152 | module_exit(ebt_ip6_fini); | |
153 | MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match"); | |
8244f4ba | 154 | MODULE_AUTHOR("Kuo-Lang Tseng <kuo-lang.tseng@intel.com>"); |
93f65158 | 155 | MODULE_LICENSE("GPL"); |