Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
| 3 | * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org> |
| 4 | * Copyright (c) 2012 Intel Corporation |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/ip.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/netlink.h> |
| 18 | #include <linux/netfilter.h> |
| 19 | #include <linux/netfilter_ipv4.h> |
| 20 | #include <linux/netfilter/nfnetlink.h> |
| 21 | #include <linux/netfilter/nf_tables.h> |
| 22 | #include <net/netfilter/nf_conntrack.h> |
| 23 | #include <net/netfilter/nf_nat.h> |
| 24 | #include <net/netfilter/nf_nat_core.h> |
| 25 | #include <net/netfilter/nf_tables.h> |
| 26 | #include <net/netfilter/nf_nat_l3proto.h> |
| 27 | #include <net/ip.h> |
| 28 | |
| 29 | struct nft_nat { |
| 30 | enum nft_registers sreg_addr_min:8; |
| 31 | enum nft_registers sreg_addr_max:8; |
| 32 | enum nft_registers sreg_proto_min:8; |
| 33 | enum nft_registers sreg_proto_max:8; |
Patrick McHardy | a4c2e8b | 2014-03-07 19:08:33 +0100 | [diff] [blame] | 34 | enum nf_nat_manip_type type:8; |
| 35 | u8 family; |
Arturo Borrero | e42eff8 | 2014-09-04 14:06:14 +0200 | [diff] [blame^] | 36 | u16 flags; |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 37 | }; |
| 38 | |
| 39 | static void nft_nat_eval(const struct nft_expr *expr, |
| 40 | struct nft_data data[NFT_REG_MAX + 1], |
| 41 | const struct nft_pktinfo *pkt) |
| 42 | { |
| 43 | const struct nft_nat *priv = nft_expr_priv(expr); |
| 44 | enum ip_conntrack_info ctinfo; |
| 45 | struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo); |
| 46 | struct nf_nat_range range; |
| 47 | |
| 48 | memset(&range, 0, sizeof(range)); |
| 49 | if (priv->sreg_addr_min) { |
| 50 | if (priv->family == AF_INET) { |
Tomasz Bursztyka | 98c37b6 | 2013-10-28 12:19:45 +0200 | [diff] [blame] | 51 | range.min_addr.ip = (__force __be32) |
| 52 | data[priv->sreg_addr_min].data[0]; |
| 53 | range.max_addr.ip = (__force __be32) |
| 54 | data[priv->sreg_addr_max].data[0]; |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 55 | |
| 56 | } else { |
| 57 | memcpy(range.min_addr.ip6, |
| 58 | data[priv->sreg_addr_min].data, |
| 59 | sizeof(struct nft_data)); |
| 60 | memcpy(range.max_addr.ip6, |
| 61 | data[priv->sreg_addr_max].data, |
| 62 | sizeof(struct nft_data)); |
| 63 | } |
| 64 | range.flags |= NF_NAT_RANGE_MAP_IPS; |
| 65 | } |
| 66 | |
| 67 | if (priv->sreg_proto_min) { |
Tomasz Bursztyka | 98c37b6 | 2013-10-28 12:19:45 +0200 | [diff] [blame] | 68 | range.min_proto.all = (__force __be16) |
| 69 | data[priv->sreg_proto_min].data[0]; |
| 70 | range.max_proto.all = (__force __be16) |
| 71 | data[priv->sreg_proto_max].data[0]; |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 72 | range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
| 73 | } |
| 74 | |
Arturo Borrero | e42eff8 | 2014-09-04 14:06:14 +0200 | [diff] [blame^] | 75 | range.flags |= priv->flags; |
| 76 | |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 77 | data[NFT_REG_VERDICT].verdict = |
| 78 | nf_nat_setup_info(ct, &range, priv->type); |
| 79 | } |
| 80 | |
| 81 | static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = { |
| 82 | [NFTA_NAT_TYPE] = { .type = NLA_U32 }, |
| 83 | [NFTA_NAT_FAMILY] = { .type = NLA_U32 }, |
| 84 | [NFTA_NAT_REG_ADDR_MIN] = { .type = NLA_U32 }, |
| 85 | [NFTA_NAT_REG_ADDR_MAX] = { .type = NLA_U32 }, |
| 86 | [NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 }, |
| 87 | [NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 }, |
Arturo Borrero | e42eff8 | 2014-09-04 14:06:14 +0200 | [diff] [blame^] | 88 | [NFTA_NAT_FLAGS] = { .type = NLA_U32 }, |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 89 | }; |
| 90 | |
| 91 | static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr, |
| 92 | const struct nlattr * const tb[]) |
| 93 | { |
| 94 | struct nft_nat *priv = nft_expr_priv(expr); |
Patrick McHardy | a4c2e8b | 2014-03-07 19:08:33 +0100 | [diff] [blame] | 95 | u32 family; |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 96 | int err; |
| 97 | |
| 98 | if (tb[NFTA_NAT_TYPE] == NULL) |
| 99 | return -EINVAL; |
| 100 | |
| 101 | switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) { |
| 102 | case NFT_NAT_SNAT: |
| 103 | priv->type = NF_NAT_MANIP_SRC; |
| 104 | break; |
| 105 | case NFT_NAT_DNAT: |
| 106 | priv->type = NF_NAT_MANIP_DST; |
| 107 | break; |
| 108 | default: |
| 109 | return -EINVAL; |
| 110 | } |
| 111 | |
| 112 | if (tb[NFTA_NAT_FAMILY] == NULL) |
| 113 | return -EINVAL; |
| 114 | |
Patrick McHardy | a4c2e8b | 2014-03-07 19:08:33 +0100 | [diff] [blame] | 115 | family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY])); |
| 116 | if (family != AF_INET && family != AF_INET6) |
| 117 | return -EAFNOSUPPORT; |
| 118 | if (family != ctx->afi->family) |
| 119 | return -EOPNOTSUPP; |
| 120 | priv->family = family; |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 121 | |
| 122 | if (tb[NFTA_NAT_REG_ADDR_MIN]) { |
| 123 | priv->sreg_addr_min = ntohl(nla_get_be32( |
| 124 | tb[NFTA_NAT_REG_ADDR_MIN])); |
| 125 | err = nft_validate_input_register(priv->sreg_addr_min); |
| 126 | if (err < 0) |
| 127 | return err; |
| 128 | } |
| 129 | |
| 130 | if (tb[NFTA_NAT_REG_ADDR_MAX]) { |
| 131 | priv->sreg_addr_max = ntohl(nla_get_be32( |
| 132 | tb[NFTA_NAT_REG_ADDR_MAX])); |
| 133 | err = nft_validate_input_register(priv->sreg_addr_max); |
| 134 | if (err < 0) |
| 135 | return err; |
| 136 | } else |
| 137 | priv->sreg_addr_max = priv->sreg_addr_min; |
| 138 | |
| 139 | if (tb[NFTA_NAT_REG_PROTO_MIN]) { |
| 140 | priv->sreg_proto_min = ntohl(nla_get_be32( |
| 141 | tb[NFTA_NAT_REG_PROTO_MIN])); |
| 142 | err = nft_validate_input_register(priv->sreg_proto_min); |
| 143 | if (err < 0) |
| 144 | return err; |
| 145 | } |
| 146 | |
| 147 | if (tb[NFTA_NAT_REG_PROTO_MAX]) { |
| 148 | priv->sreg_proto_max = ntohl(nla_get_be32( |
| 149 | tb[NFTA_NAT_REG_PROTO_MAX])); |
| 150 | err = nft_validate_input_register(priv->sreg_proto_max); |
| 151 | if (err < 0) |
| 152 | return err; |
| 153 | } else |
| 154 | priv->sreg_proto_max = priv->sreg_proto_min; |
| 155 | |
Arturo Borrero | e42eff8 | 2014-09-04 14:06:14 +0200 | [diff] [blame^] | 156 | if (tb[NFTA_NAT_FLAGS]) { |
| 157 | priv->flags = ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS])); |
| 158 | if (priv->flags & ~NF_NAT_RANGE_MASK) |
| 159 | return -EINVAL; |
| 160 | } |
| 161 | |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 166 | { |
| 167 | const struct nft_nat *priv = nft_expr_priv(expr); |
| 168 | |
| 169 | switch (priv->type) { |
| 170 | case NF_NAT_MANIP_SRC: |
| 171 | if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT))) |
| 172 | goto nla_put_failure; |
| 173 | break; |
| 174 | case NF_NAT_MANIP_DST: |
| 175 | if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT))) |
| 176 | goto nla_put_failure; |
| 177 | break; |
| 178 | } |
| 179 | |
| 180 | if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family))) |
| 181 | goto nla_put_failure; |
| 182 | if (nla_put_be32(skb, |
| 183 | NFTA_NAT_REG_ADDR_MIN, htonl(priv->sreg_addr_min))) |
| 184 | goto nla_put_failure; |
| 185 | if (nla_put_be32(skb, |
| 186 | NFTA_NAT_REG_ADDR_MAX, htonl(priv->sreg_addr_max))) |
| 187 | goto nla_put_failure; |
Pablo Neira Ayuso | 9151360 | 2014-06-13 13:45:38 +0200 | [diff] [blame] | 188 | if (priv->sreg_proto_min) { |
| 189 | if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MIN, |
| 190 | htonl(priv->sreg_proto_min))) |
| 191 | goto nla_put_failure; |
| 192 | if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MAX, |
| 193 | htonl(priv->sreg_proto_max))) |
| 194 | goto nla_put_failure; |
| 195 | } |
Arturo Borrero | e42eff8 | 2014-09-04 14:06:14 +0200 | [diff] [blame^] | 196 | |
| 197 | if (priv->flags != 0) { |
| 198 | if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags))) |
| 199 | goto nla_put_failure; |
| 200 | } |
| 201 | |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 202 | return 0; |
| 203 | |
| 204 | nla_put_failure: |
| 205 | return -1; |
| 206 | } |
| 207 | |
| 208 | static struct nft_expr_type nft_nat_type; |
| 209 | static const struct nft_expr_ops nft_nat_ops = { |
| 210 | .type = &nft_nat_type, |
| 211 | .size = NFT_EXPR_SIZE(sizeof(struct nft_nat)), |
| 212 | .eval = nft_nat_eval, |
| 213 | .init = nft_nat_init, |
| 214 | .dump = nft_nat_dump, |
| 215 | }; |
| 216 | |
| 217 | static struct nft_expr_type nft_nat_type __read_mostly = { |
| 218 | .name = "nat", |
| 219 | .ops = &nft_nat_ops, |
| 220 | .policy = nft_nat_policy, |
| 221 | .maxattr = NFTA_NAT_MAX, |
| 222 | .owner = THIS_MODULE, |
| 223 | }; |
| 224 | |
| 225 | static int __init nft_nat_module_init(void) |
| 226 | { |
Patrick McHardy | a4c2e8b | 2014-03-07 19:08:33 +0100 | [diff] [blame] | 227 | return nft_register_expr(&nft_nat_type); |
Tomasz Bursztyka | eb31628 | 2013-10-10 13:39:19 +0200 | [diff] [blame] | 228 | } |
| 229 | |
| 230 | static void __exit nft_nat_module_exit(void) |
| 231 | { |
| 232 | nft_unregister_expr(&nft_nat_type); |
| 233 | } |
| 234 | |
| 235 | module_init(nft_nat_module_init); |
| 236 | module_exit(nft_nat_module_exit); |
| 237 | |
| 238 | MODULE_LICENSE("GPL"); |
| 239 | MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>"); |
| 240 | MODULE_ALIAS_NFT_EXPR("nat"); |