Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
93f65158 KT |
2 | /* |
3 | * ebt_ip6 | |
4 | * | |
5 | * Authors: | |
6 | * Manohar Castelino <manohar.r.castelino@intel.com> | |
7 | * Kuo-Lang Tseng <kuo-lang.tseng@intel.com> | |
408ffaa4 | 8 | * Jan Engelhardt <jengelh@medozas.de> |
93f65158 KT |
9 | * |
10 | * Summary: | |
11 | * This is just a modification of the IPv4 code written by | |
12 | * Bart De Schuymer <bdschuym@pandora.be> | |
13 | * with the changes required to support IPv6 | |
14 | * | |
15 | * Jan, 2008 | |
16 | */ | |
93f65158 KT |
17 | #include <linux/ipv6.h> |
18 | #include <net/ipv6.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/module.h> | |
21 | #include <net/dsfield.h> | |
18219d3f JE |
22 | #include <linux/netfilter/x_tables.h> |
23 | #include <linux/netfilter_bridge/ebtables.h> | |
24 | #include <linux/netfilter_bridge/ebt_ip6.h> | |
93f65158 | 25 | |
6faee60a FW |
26 | union pkthdr { |
27 | struct { | |
28 | __be16 src; | |
29 | __be16 dst; | |
30 | } tcpudphdr; | |
31 | struct { | |
32 | u8 type; | |
33 | u8 code; | |
34 | } icmphdr; | |
93f65158 KT |
35 | }; |
36 | ||
2d06d4a5 | 37 | static bool |
62fc8051 | 38 | ebt_ip6_mt(const struct sk_buff *skb, struct xt_action_param *par) |
93f65158 | 39 | { |
f7108a20 | 40 | const struct ebt_ip6_info *info = par->matchinfo; |
93f65158 KT |
41 | const struct ipv6hdr *ih6; |
42 | struct ipv6hdr _ip6h; | |
6faee60a FW |
43 | const union pkthdr *pptr; |
44 | union pkthdr _pkthdr; | |
93f65158 KT |
45 | |
46 | ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h); | |
47 | if (ih6 == NULL) | |
8cc784ee | 48 | return false; |
c37a2dfa JP |
49 | if ((info->bitmask & EBT_IP6_TCLASS) && |
50 | NF_INVF(info, EBT_IP6_TCLASS, | |
51 | info->tclass != ipv6_get_dsfield(ih6))) | |
8cc784ee | 52 | return false; |
c37a2dfa JP |
53 | if (((info->bitmask & EBT_IP6_SOURCE) && |
54 | NF_INVF(info, EBT_IP6_SOURCE, | |
55 | ipv6_masked_addr_cmp(&ih6->saddr, &info->smsk, | |
56 | &info->saddr))) || | |
57 | ((info->bitmask & EBT_IP6_DEST) && | |
58 | NF_INVF(info, EBT_IP6_DEST, | |
59 | ipv6_masked_addr_cmp(&ih6->daddr, &info->dmsk, | |
60 | &info->daddr)))) | |
8cc784ee | 61 | return false; |
93f65158 KT |
62 | if (info->bitmask & EBT_IP6_PROTO) { |
63 | uint8_t nexthdr = ih6->nexthdr; | |
75f2811c | 64 | __be16 frag_off; |
93f65158 KT |
65 | int offset_ph; |
66 | ||
75f2811c | 67 | offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr, &frag_off); |
93f65158 | 68 | if (offset_ph == -1) |
8cc784ee | 69 | return false; |
c37a2dfa | 70 | if (NF_INVF(info, EBT_IP6_PROTO, info->protocol != nexthdr)) |
8cc784ee | 71 | return false; |
c1bc1d25 IM |
72 | if (!(info->bitmask & (EBT_IP6_DPORT | |
73 | EBT_IP6_SPORT | EBT_IP6_ICMP6))) | |
8cc784ee | 74 | return true; |
6faee60a FW |
75 | |
76 | /* min icmpv6 headersize is 4, so sizeof(_pkthdr) is ok. */ | |
77 | pptr = skb_header_pointer(skb, offset_ph, sizeof(_pkthdr), | |
78 | &_pkthdr); | |
93f65158 | 79 | if (pptr == NULL) |
8cc784ee | 80 | return false; |
93f65158 | 81 | if (info->bitmask & EBT_IP6_DPORT) { |
6faee60a | 82 | u16 dst = ntohs(pptr->tcpudphdr.dst); |
c37a2dfa JP |
83 | if (NF_INVF(info, EBT_IP6_DPORT, |
84 | dst < info->dport[0] || | |
85 | dst > info->dport[1])) | |
8cc784ee | 86 | return false; |
93f65158 KT |
87 | } |
88 | if (info->bitmask & EBT_IP6_SPORT) { | |
6faee60a | 89 | u16 src = ntohs(pptr->tcpudphdr.src); |
c37a2dfa JP |
90 | if (NF_INVF(info, EBT_IP6_SPORT, |
91 | src < info->sport[0] || | |
92 | src > info->sport[1])) | |
c816c255 | 93 | return false; |
93f65158 | 94 | } |
6faee60a | 95 | if ((info->bitmask & EBT_IP6_ICMP6) && |
c37a2dfa JP |
96 | NF_INVF(info, EBT_IP6_ICMP6, |
97 | pptr->icmphdr.type < info->icmpv6_type[0] || | |
98 | pptr->icmphdr.type > info->icmpv6_type[1] || | |
99 | pptr->icmphdr.code < info->icmpv6_code[0] || | |
100 | pptr->icmphdr.code > info->icmpv6_code[1])) | |
6faee60a | 101 | return false; |
93f65158 | 102 | } |
8cc784ee | 103 | return true; |
93f65158 KT |
104 | } |
105 | ||
b0f38452 | 106 | static int ebt_ip6_mt_check(const struct xt_mtchk_param *par) |
93f65158 | 107 | { |
9b4fce7a JE |
108 | const struct ebt_entry *e = par->entryinfo; |
109 | struct ebt_ip6_info *info = par->matchinfo; | |
93f65158 | 110 | |
93f65158 | 111 | if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO) |
bd414ee6 | 112 | return -EINVAL; |
93f65158 | 113 | if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK) |
bd414ee6 | 114 | return -EINVAL; |
93f65158 KT |
115 | if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) { |
116 | if (info->invflags & EBT_IP6_PROTO) | |
bd414ee6 | 117 | return -EINVAL; |
93f65158 KT |
118 | if (info->protocol != IPPROTO_TCP && |
119 | info->protocol != IPPROTO_UDP && | |
120 | info->protocol != IPPROTO_UDPLITE && | |
121 | info->protocol != IPPROTO_SCTP && | |
122 | info->protocol != IPPROTO_DCCP) | |
bd414ee6 | 123 | return -EINVAL; |
93f65158 KT |
124 | } |
125 | if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1]) | |
bd414ee6 | 126 | return -EINVAL; |
93f65158 | 127 | if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1]) |
bd414ee6 | 128 | return -EINVAL; |
6faee60a FW |
129 | if (info->bitmask & EBT_IP6_ICMP6) { |
130 | if ((info->invflags & EBT_IP6_PROTO) || | |
131 | info->protocol != IPPROTO_ICMPV6) | |
132 | return -EINVAL; | |
133 | if (info->icmpv6_type[0] > info->icmpv6_type[1] || | |
134 | info->icmpv6_code[0] > info->icmpv6_code[1]) | |
135 | return -EINVAL; | |
136 | } | |
bd414ee6 | 137 | return 0; |
93f65158 KT |
138 | } |
139 | ||
043ef46c JE |
140 | static struct xt_match ebt_ip6_mt_reg __read_mostly = { |
141 | .name = "ip6", | |
001a18d3 JE |
142 | .revision = 0, |
143 | .family = NFPROTO_BRIDGE, | |
2d06d4a5 JE |
144 | .match = ebt_ip6_mt, |
145 | .checkentry = ebt_ip6_mt_check, | |
fc0e3df4 | 146 | .matchsize = sizeof(struct ebt_ip6_info), |
93f65158 KT |
147 | .me = THIS_MODULE, |
148 | }; | |
149 | ||
150 | static int __init ebt_ip6_init(void) | |
151 | { | |
043ef46c | 152 | return xt_register_match(&ebt_ip6_mt_reg); |
93f65158 KT |
153 | } |
154 | ||
155 | static void __exit ebt_ip6_fini(void) | |
156 | { | |
043ef46c | 157 | xt_unregister_match(&ebt_ip6_mt_reg); |
93f65158 KT |
158 | } |
159 | ||
160 | module_init(ebt_ip6_init); | |
161 | module_exit(ebt_ip6_fini); | |
162 | MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match"); | |
8244f4ba | 163 | MODULE_AUTHOR("Kuo-Lang Tseng <kuo-lang.tseng@intel.com>"); |
93f65158 | 164 | MODULE_LICENSE("GPL"); |