Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1 | /* NAT for netfilter; shared with compatibility layer. */ |
| 2 | |
| 3 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 4 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/timer.h> |
| 14 | #include <linux/skbuff.h> |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 15 | #include <net/checksum.h> |
| 16 | #include <net/icmp.h> |
| 17 | #include <net/ip.h> |
| 18 | #include <net/tcp.h> /* For tcp_prot in getorigdst */ |
| 19 | #include <linux/icmp.h> |
| 20 | #include <linux/udp.h> |
| 21 | #include <linux/jhash.h> |
| 22 | |
| 23 | #include <linux/netfilter_ipv4.h> |
| 24 | #include <net/netfilter/nf_conntrack.h> |
| 25 | #include <net/netfilter/nf_conntrack_core.h> |
| 26 | #include <net/netfilter/nf_nat.h> |
| 27 | #include <net/netfilter/nf_nat_protocol.h> |
| 28 | #include <net/netfilter/nf_nat_core.h> |
| 29 | #include <net/netfilter/nf_nat_helper.h> |
| 30 | #include <net/netfilter/nf_conntrack_helper.h> |
| 31 | #include <net/netfilter/nf_conntrack_l3proto.h> |
| 32 | #include <net/netfilter/nf_conntrack_l4proto.h> |
| 33 | |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 34 | static DEFINE_SPINLOCK(nf_nat_lock); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 35 | |
Patrick McHardy | ce4b1ce | 2007-12-17 22:37:52 -0800 | [diff] [blame] | 36 | static struct nf_conntrack_l3proto *l3proto __read_mostly; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 37 | |
| 38 | /* Calculated at init based on memory size */ |
Patrick McHardy | ce4b1ce | 2007-12-17 22:37:52 -0800 | [diff] [blame] | 39 | static unsigned int nf_nat_htable_size __read_mostly; |
Patrick McHardy | 53aba59 | 2007-07-07 22:30:27 -0700 | [diff] [blame] | 40 | static int nf_nat_vmalloced; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 41 | |
Patrick McHardy | ce4b1ce | 2007-12-17 22:37:52 -0800 | [diff] [blame] | 42 | static struct hlist_head *bysource __read_mostly; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 43 | |
| 44 | #define MAX_IP_NAT_PROTO 256 |
Patrick McHardy | ce4b1ce | 2007-12-17 22:37:52 -0800 | [diff] [blame] | 45 | static const struct nf_nat_protocol *nf_nat_protos[MAX_IP_NAT_PROTO] |
| 46 | __read_mostly; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 47 | |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 48 | static inline const struct nf_nat_protocol * |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 49 | __nf_nat_proto_find(u_int8_t protonum) |
| 50 | { |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 51 | return rcu_dereference(nf_nat_protos[protonum]); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 52 | } |
| 53 | |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 54 | const struct nf_nat_protocol * |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 55 | nf_nat_proto_find_get(u_int8_t protonum) |
| 56 | { |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 57 | const struct nf_nat_protocol *p; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 58 | |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 59 | rcu_read_lock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 60 | p = __nf_nat_proto_find(protonum); |
| 61 | if (!try_module_get(p->me)) |
| 62 | p = &nf_nat_unknown_protocol; |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 63 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 64 | |
| 65 | return p; |
| 66 | } |
| 67 | EXPORT_SYMBOL_GPL(nf_nat_proto_find_get); |
| 68 | |
| 69 | void |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 70 | nf_nat_proto_put(const struct nf_nat_protocol *p) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 71 | { |
| 72 | module_put(p->me); |
| 73 | } |
| 74 | EXPORT_SYMBOL_GPL(nf_nat_proto_put); |
| 75 | |
| 76 | /* We keep an extra hash for each conntrack, for fast searching. */ |
| 77 | static inline unsigned int |
| 78 | hash_by_src(const struct nf_conntrack_tuple *tuple) |
| 79 | { |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 80 | unsigned int hash; |
| 81 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 82 | /* Original src, to ensure we map it consistently if poss. */ |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 83 | hash = jhash_3words((__force u32)tuple->src.u3.ip, |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 84 | (__force u32)tuple->src.u.all, |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 85 | tuple->dst.protonum, 0); |
| 86 | return ((u64)hash * nf_nat_htable_size) >> 32; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 87 | } |
| 88 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 89 | /* Is this tuple already taken? (not by us) */ |
| 90 | int |
| 91 | nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple, |
| 92 | const struct nf_conn *ignored_conntrack) |
| 93 | { |
| 94 | /* Conntrack tracking doesn't keep track of outgoing tuples; only |
| 95 | incoming ones. NAT means they don't have a fixed mapping, |
| 96 | so we invert the tuple and look for the incoming reply. |
| 97 | |
| 98 | We could keep a separate hash if this proves too slow. */ |
| 99 | struct nf_conntrack_tuple reply; |
| 100 | |
| 101 | nf_ct_invert_tuplepr(&reply, tuple); |
| 102 | return nf_conntrack_tuple_taken(&reply, ignored_conntrack); |
| 103 | } |
| 104 | EXPORT_SYMBOL(nf_nat_used_tuple); |
| 105 | |
| 106 | /* If we source map this tuple so reply looks like reply_tuple, will |
| 107 | * that meet the constraints of range. */ |
| 108 | static int |
| 109 | in_range(const struct nf_conntrack_tuple *tuple, |
| 110 | const struct nf_nat_range *range) |
| 111 | { |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 112 | const struct nf_nat_protocol *proto; |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 113 | int ret = 0; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 114 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 115 | /* If we are supposed to map IPs, then we must be in the |
| 116 | range specified, otherwise let this drag us onto a new src IP. */ |
| 117 | if (range->flags & IP_NAT_RANGE_MAP_IPS) { |
| 118 | if (ntohl(tuple->src.u3.ip) < ntohl(range->min_ip) || |
| 119 | ntohl(tuple->src.u3.ip) > ntohl(range->max_ip)) |
| 120 | return 0; |
| 121 | } |
| 122 | |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 123 | rcu_read_lock(); |
| 124 | proto = __nf_nat_proto_find(tuple->dst.protonum); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 125 | if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED) || |
| 126 | proto->in_range(tuple, IP_NAT_MANIP_SRC, |
| 127 | &range->min, &range->max)) |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 128 | ret = 1; |
| 129 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 130 | |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 131 | return ret; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | static inline int |
| 135 | same_src(const struct nf_conn *ct, |
| 136 | const struct nf_conntrack_tuple *tuple) |
| 137 | { |
| 138 | const struct nf_conntrack_tuple *t; |
| 139 | |
| 140 | t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; |
| 141 | return (t->dst.protonum == tuple->dst.protonum && |
| 142 | t->src.u3.ip == tuple->src.u3.ip && |
| 143 | t->src.u.all == tuple->src.u.all); |
| 144 | } |
| 145 | |
| 146 | /* Only called for SRC manip */ |
| 147 | static int |
| 148 | find_appropriate_src(const struct nf_conntrack_tuple *tuple, |
| 149 | struct nf_conntrack_tuple *result, |
| 150 | const struct nf_nat_range *range) |
| 151 | { |
| 152 | unsigned int h = hash_by_src(tuple); |
Jan Engelhardt | 72b7294 | 2008-04-14 11:15:42 +0200 | [diff] [blame] | 153 | const struct nf_conn_nat *nat; |
| 154 | const struct nf_conn *ct; |
| 155 | const struct hlist_node *n; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 156 | |
Patrick McHardy | 4d354c5 | 2008-01-31 04:42:37 -0800 | [diff] [blame] | 157 | rcu_read_lock(); |
| 158 | hlist_for_each_entry_rcu(nat, n, &bysource[h], bysource) { |
Yasuyuki Kozakai | b6b84d4 | 2007-07-07 22:26:35 -0700 | [diff] [blame] | 159 | ct = nat->ct; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 160 | if (same_src(ct, tuple)) { |
| 161 | /* Copy source part from reply tuple. */ |
| 162 | nf_ct_invert_tuplepr(result, |
| 163 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 164 | result->dst = tuple->dst; |
| 165 | |
| 166 | if (in_range(result, range)) { |
Patrick McHardy | 4d354c5 | 2008-01-31 04:42:37 -0800 | [diff] [blame] | 167 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 168 | return 1; |
| 169 | } |
| 170 | } |
| 171 | } |
Patrick McHardy | 4d354c5 | 2008-01-31 04:42:37 -0800 | [diff] [blame] | 172 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | /* For [FUTURE] fragmentation handling, we want the least-used |
| 177 | src-ip/dst-ip/proto triple. Fairness doesn't come into it. Thus |
| 178 | if the range specifies 1.2.3.4 ports 10000-10005 and 1.2.3.5 ports |
| 179 | 1-65535, we don't do pro-rata allocation based on ports; we choose |
| 180 | the ip with the lowest src-ip/dst-ip/proto usage. |
| 181 | */ |
| 182 | static void |
| 183 | find_best_ips_proto(struct nf_conntrack_tuple *tuple, |
| 184 | const struct nf_nat_range *range, |
| 185 | const struct nf_conn *ct, |
| 186 | enum nf_nat_manip_type maniptype) |
| 187 | { |
| 188 | __be32 *var_ipp; |
| 189 | /* Host order */ |
| 190 | u_int32_t minip, maxip, j; |
| 191 | |
| 192 | /* No IP mapping? Do nothing. */ |
| 193 | if (!(range->flags & IP_NAT_RANGE_MAP_IPS)) |
| 194 | return; |
| 195 | |
| 196 | if (maniptype == IP_NAT_MANIP_SRC) |
| 197 | var_ipp = &tuple->src.u3.ip; |
| 198 | else |
| 199 | var_ipp = &tuple->dst.u3.ip; |
| 200 | |
| 201 | /* Fast path: only one choice. */ |
| 202 | if (range->min_ip == range->max_ip) { |
| 203 | *var_ipp = range->min_ip; |
| 204 | return; |
| 205 | } |
| 206 | |
| 207 | /* Hashing source and destination IPs gives a fairly even |
| 208 | * spread in practice (if there are a small number of IPs |
| 209 | * involved, there usually aren't that many connections |
| 210 | * anyway). The consistency means that servers see the same |
| 211 | * client coming from the same IP (some Internet Banking sites |
| 212 | * like this), even across reboots. */ |
| 213 | minip = ntohl(range->min_ip); |
| 214 | maxip = ntohl(range->max_ip); |
| 215 | j = jhash_2words((__force u32)tuple->src.u3.ip, |
| 216 | (__force u32)tuple->dst.u3.ip, 0); |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 217 | j = ((u64)j * (maxip - minip + 1)) >> 32; |
| 218 | *var_ipp = htonl(minip + j); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 219 | } |
| 220 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 221 | /* Manipulate the tuple into the range given. For NF_INET_POST_ROUTING, |
| 222 | * we change the source to map into the range. For NF_INET_PRE_ROUTING |
| 223 | * and NF_INET_LOCAL_OUT, we change the destination to map into the |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 224 | * range. It might not be possible to get a unique tuple, but we try. |
| 225 | * At worst (or if we race), we will end up with a final duplicate in |
| 226 | * __ip_conntrack_confirm and drop the packet. */ |
| 227 | static void |
| 228 | get_unique_tuple(struct nf_conntrack_tuple *tuple, |
| 229 | const struct nf_conntrack_tuple *orig_tuple, |
| 230 | const struct nf_nat_range *range, |
| 231 | struct nf_conn *ct, |
| 232 | enum nf_nat_manip_type maniptype) |
| 233 | { |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 234 | const struct nf_nat_protocol *proto; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 235 | |
| 236 | /* 1) If this srcip/proto/src-proto-part is currently mapped, |
| 237 | and that same mapping gives a unique tuple within the given |
| 238 | range, use that. |
| 239 | |
| 240 | This is only required for source (ie. NAT/masq) mappings. |
| 241 | So far, we don't do local source mappings, so multiple |
| 242 | manips not an issue. */ |
Changli Gao | 0dbff68 | 2008-07-21 10:00:51 -0700 | [diff] [blame] | 243 | if (maniptype == IP_NAT_MANIP_SRC && |
| 244 | !(range->flags & IP_NAT_RANGE_PROTO_RANDOM)) { |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 245 | if (find_appropriate_src(orig_tuple, tuple, range)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 246 | pr_debug("get_unique_tuple: Found current src map\n"); |
Changli Gao | 0dbff68 | 2008-07-21 10:00:51 -0700 | [diff] [blame] | 247 | if (!nf_nat_used_tuple(tuple, ct)) |
| 248 | return; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 249 | } |
| 250 | } |
| 251 | |
| 252 | /* 2) Select the least-used IP/proto combination in the given |
| 253 | range. */ |
| 254 | *tuple = *orig_tuple; |
| 255 | find_best_ips_proto(tuple, range, ct, maniptype); |
| 256 | |
| 257 | /* 3) The per-protocol part of the manip is made to map into |
| 258 | the range to make a unique tuple. */ |
| 259 | |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 260 | rcu_read_lock(); |
| 261 | proto = __nf_nat_proto_find(orig_tuple->dst.protonum); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 262 | |
Eric Leblond | 41f4689 | 2007-02-07 15:10:09 -0800 | [diff] [blame] | 263 | /* Change protocol info to have some randomization */ |
| 264 | if (range->flags & IP_NAT_RANGE_PROTO_RANDOM) { |
| 265 | proto->unique_tuple(tuple, range, maniptype, ct); |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 266 | goto out; |
Eric Leblond | 41f4689 | 2007-02-07 15:10:09 -0800 | [diff] [blame] | 267 | } |
| 268 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 269 | /* Only bother mapping if it's not already in range and unique */ |
| 270 | if ((!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED) || |
| 271 | proto->in_range(tuple, maniptype, &range->min, &range->max)) && |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 272 | !nf_nat_used_tuple(tuple, ct)) |
| 273 | goto out; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 274 | |
| 275 | /* Last change: get protocol to try to obtain unique tuple. */ |
| 276 | proto->unique_tuple(tuple, range, maniptype, ct); |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 277 | out: |
| 278 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | unsigned int |
| 282 | nf_nat_setup_info(struct nf_conn *ct, |
| 283 | const struct nf_nat_range *range, |
Patrick McHardy | cc01dcb | 2007-12-17 22:38:20 -0800 | [diff] [blame] | 284 | enum nf_nat_manip_type maniptype) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 285 | { |
| 286 | struct nf_conntrack_tuple curr_tuple, new_tuple; |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 287 | struct nf_conn_nat *nat; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 288 | int have_to_hash = !(ct->status & IPS_NAT_DONE_MASK); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 289 | |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 290 | /* nat helper or nfctnetlink also setup binding */ |
| 291 | nat = nfct_nat(ct); |
| 292 | if (!nat) { |
| 293 | nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC); |
| 294 | if (nat == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 295 | pr_debug("failed to add NAT extension\n"); |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 296 | return NF_ACCEPT; |
| 297 | } |
| 298 | } |
| 299 | |
Patrick McHardy | cc01dcb | 2007-12-17 22:38:20 -0800 | [diff] [blame] | 300 | NF_CT_ASSERT(maniptype == IP_NAT_MANIP_SRC || |
| 301 | maniptype == IP_NAT_MANIP_DST); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 302 | BUG_ON(nf_nat_initialized(ct, maniptype)); |
| 303 | |
| 304 | /* What we've got will look like inverse of reply. Normally |
| 305 | this is what is in the conntrack, except for prior |
| 306 | manipulations (future optimization: if num_manips == 0, |
| 307 | orig_tp = |
| 308 | conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple) */ |
| 309 | nf_ct_invert_tuplepr(&curr_tuple, |
| 310 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 311 | |
| 312 | get_unique_tuple(&new_tuple, &curr_tuple, range, ct, maniptype); |
| 313 | |
| 314 | if (!nf_ct_tuple_equal(&new_tuple, &curr_tuple)) { |
| 315 | struct nf_conntrack_tuple reply; |
| 316 | |
| 317 | /* Alter conntrack table so will recognize replies. */ |
| 318 | nf_ct_invert_tuplepr(&reply, &new_tuple); |
| 319 | nf_conntrack_alter_reply(ct, &reply); |
| 320 | |
| 321 | /* Non-atomic: we own this at the moment. */ |
| 322 | if (maniptype == IP_NAT_MANIP_SRC) |
| 323 | ct->status |= IPS_SRC_NAT; |
| 324 | else |
| 325 | ct->status |= IPS_DST_NAT; |
| 326 | } |
| 327 | |
| 328 | /* Place in source hash if this is the first time. */ |
| 329 | if (have_to_hash) { |
| 330 | unsigned int srchash; |
| 331 | |
| 332 | srchash = hash_by_src(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 333 | spin_lock_bh(&nf_nat_lock); |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 334 | /* nf_conntrack_alter_reply might re-allocate exntension aera */ |
Yasuyuki Kozakai | b6b84d4 | 2007-07-07 22:26:35 -0700 | [diff] [blame] | 335 | nat = nfct_nat(ct); |
| 336 | nat->ct = ct; |
Patrick McHardy | 4d354c5 | 2008-01-31 04:42:37 -0800 | [diff] [blame] | 337 | hlist_add_head_rcu(&nat->bysource, &bysource[srchash]); |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 338 | spin_unlock_bh(&nf_nat_lock); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | /* It's done. */ |
| 342 | if (maniptype == IP_NAT_MANIP_DST) |
| 343 | set_bit(IPS_DST_NAT_DONE_BIT, &ct->status); |
| 344 | else |
| 345 | set_bit(IPS_SRC_NAT_DONE_BIT, &ct->status); |
| 346 | |
| 347 | return NF_ACCEPT; |
| 348 | } |
| 349 | EXPORT_SYMBOL(nf_nat_setup_info); |
| 350 | |
| 351 | /* Returns true if succeeded. */ |
Jan Engelhardt | f2ea825 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 352 | static bool |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 353 | manip_pkt(u_int16_t proto, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 354 | struct sk_buff *skb, |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 355 | unsigned int iphdroff, |
| 356 | const struct nf_conntrack_tuple *target, |
| 357 | enum nf_nat_manip_type maniptype) |
| 358 | { |
| 359 | struct iphdr *iph; |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 360 | const struct nf_nat_protocol *p; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 361 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 362 | if (!skb_make_writable(skb, iphdroff + sizeof(*iph))) |
Jan Engelhardt | f2ea825 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 363 | return false; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 364 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 365 | iph = (void *)skb->data + iphdroff; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 366 | |
| 367 | /* Manipulate protcol part. */ |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 368 | |
| 369 | /* rcu_read_lock()ed by nf_hook_slow */ |
| 370 | p = __nf_nat_proto_find(proto); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 371 | if (!p->manip_pkt(skb, iphdroff, target, maniptype)) |
Jan Engelhardt | f2ea825 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 372 | return false; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 373 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 374 | iph = (void *)skb->data + iphdroff; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 375 | |
| 376 | if (maniptype == IP_NAT_MANIP_SRC) { |
Patrick McHardy | be0ea7d | 2007-11-30 01:17:11 +1100 | [diff] [blame] | 377 | csum_replace4(&iph->check, iph->saddr, target->src.u3.ip); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 378 | iph->saddr = target->src.u3.ip; |
| 379 | } else { |
Patrick McHardy | be0ea7d | 2007-11-30 01:17:11 +1100 | [diff] [blame] | 380 | csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 381 | iph->daddr = target->dst.u3.ip; |
| 382 | } |
Jan Engelhardt | f2ea825 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 383 | return true; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | /* Do packet manipulations according to nf_nat_setup_info. */ |
| 387 | unsigned int nf_nat_packet(struct nf_conn *ct, |
| 388 | enum ip_conntrack_info ctinfo, |
| 389 | unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 390 | struct sk_buff *skb) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 391 | { |
| 392 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
| 393 | unsigned long statusbit; |
| 394 | enum nf_nat_manip_type mtype = HOOK2MANIP(hooknum); |
| 395 | |
| 396 | if (mtype == IP_NAT_MANIP_SRC) |
| 397 | statusbit = IPS_SRC_NAT; |
| 398 | else |
| 399 | statusbit = IPS_DST_NAT; |
| 400 | |
| 401 | /* Invert if this is reply dir. */ |
| 402 | if (dir == IP_CT_DIR_REPLY) |
| 403 | statusbit ^= IPS_NAT_MASK; |
| 404 | |
| 405 | /* Non-atomic: these bits don't change. */ |
| 406 | if (ct->status & statusbit) { |
| 407 | struct nf_conntrack_tuple target; |
| 408 | |
| 409 | /* We are aiming to look like inverse of other direction. */ |
| 410 | nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple); |
| 411 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 412 | if (!manip_pkt(target.dst.protonum, skb, 0, &target, mtype)) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 413 | return NF_DROP; |
| 414 | } |
| 415 | return NF_ACCEPT; |
| 416 | } |
| 417 | EXPORT_SYMBOL_GPL(nf_nat_packet); |
| 418 | |
| 419 | /* Dir is direction ICMP is coming from (opposite to packet it contains) */ |
| 420 | int nf_nat_icmp_reply_translation(struct nf_conn *ct, |
| 421 | enum ip_conntrack_info ctinfo, |
| 422 | unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 423 | struct sk_buff *skb) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 424 | { |
| 425 | struct { |
| 426 | struct icmphdr icmp; |
| 427 | struct iphdr ip; |
| 428 | } *inside; |
Jan Engelhardt | 72b7294 | 2008-04-14 11:15:42 +0200 | [diff] [blame] | 429 | const struct nf_conntrack_l4proto *l4proto; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 430 | struct nf_conntrack_tuple inner, target; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 431 | int hdrlen = ip_hdrlen(skb); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 432 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
| 433 | unsigned long statusbit; |
| 434 | enum nf_nat_manip_type manip = HOOK2MANIP(hooknum); |
| 435 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 436 | if (!skb_make_writable(skb, hdrlen + sizeof(*inside))) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 437 | return 0; |
| 438 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 439 | inside = (void *)skb->data + ip_hdrlen(skb); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 440 | |
| 441 | /* We're actually going to mangle it beyond trivial checksum |
| 442 | adjustment, so make sure the current checksum is correct. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 443 | if (nf_ip_checksum(skb, hooknum, hdrlen, 0)) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 444 | return 0; |
| 445 | |
| 446 | /* Must be RELATED */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 447 | NF_CT_ASSERT(skb->nfctinfo == IP_CT_RELATED || |
| 448 | skb->nfctinfo == IP_CT_RELATED+IP_CT_IS_REPLY); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 449 | |
| 450 | /* Redirects on non-null nats must be dropped, else they'll |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 451 | start talking to each other without our translation, and be |
| 452 | confused... --RR */ |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 453 | if (inside->icmp.type == ICMP_REDIRECT) { |
| 454 | /* If NAT isn't finished, assume it and drop. */ |
| 455 | if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK) |
| 456 | return 0; |
| 457 | |
| 458 | if (ct->status & IPS_NAT_MASK) |
| 459 | return 0; |
| 460 | } |
| 461 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 462 | pr_debug("icmp_reply_translation: translating error %p manip %u " |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 463 | "dir %s\n", skb, manip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 464 | dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY"); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 465 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 466 | /* rcu_read_lock()ed by nf_hook_slow */ |
| 467 | l4proto = __nf_ct_l4proto_find(PF_INET, inside->ip.protocol); |
| 468 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 469 | if (!nf_ct_get_tuple(skb, |
| 470 | ip_hdrlen(skb) + sizeof(struct icmphdr), |
| 471 | (ip_hdrlen(skb) + |
Arnaldo Carvalho de Melo | c9bdd4b | 2007-03-12 20:09:15 -0300 | [diff] [blame] | 472 | sizeof(struct icmphdr) + inside->ip.ihl * 4), |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 473 | (u_int16_t)AF_INET, |
| 474 | inside->ip.protocol, |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 475 | &inner, l3proto, l4proto)) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 476 | return 0; |
| 477 | |
| 478 | /* Change inner back to look like incoming packet. We do the |
| 479 | opposite manip on this hook to normal, because it might not |
| 480 | pass all hooks (locally-generated ICMP). Consider incoming |
| 481 | packet: PREROUTING (DST manip), routing produces ICMP, goes |
| 482 | through POSTROUTING (which must correct the DST manip). */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 483 | if (!manip_pkt(inside->ip.protocol, skb, |
| 484 | ip_hdrlen(skb) + sizeof(inside->icmp), |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 485 | &ct->tuplehash[!dir].tuple, |
| 486 | !manip)) |
| 487 | return 0; |
| 488 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 489 | if (skb->ip_summed != CHECKSUM_PARTIAL) { |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 490 | /* Reloading "inside" here since manip_pkt inner. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 491 | inside = (void *)skb->data + ip_hdrlen(skb); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 492 | inside->icmp.checksum = 0; |
| 493 | inside->icmp.checksum = |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 494 | csum_fold(skb_checksum(skb, hdrlen, |
| 495 | skb->len - hdrlen, 0)); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | /* Change outer to look the reply to an incoming packet |
| 499 | * (proto 0 means don't invert per-proto part). */ |
| 500 | if (manip == IP_NAT_MANIP_SRC) |
| 501 | statusbit = IPS_SRC_NAT; |
| 502 | else |
| 503 | statusbit = IPS_DST_NAT; |
| 504 | |
| 505 | /* Invert if this is reply dir. */ |
| 506 | if (dir == IP_CT_DIR_REPLY) |
| 507 | statusbit ^= IPS_NAT_MASK; |
| 508 | |
| 509 | if (ct->status & statusbit) { |
| 510 | nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 511 | if (!manip_pkt(0, skb, 0, &target, manip)) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | return 1; |
| 516 | } |
| 517 | EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation); |
| 518 | |
| 519 | /* Protocol registration. */ |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 520 | int nf_nat_protocol_register(const struct nf_nat_protocol *proto) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 521 | { |
| 522 | int ret = 0; |
| 523 | |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 524 | spin_lock_bh(&nf_nat_lock); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 525 | if (nf_nat_protos[proto->protonum] != &nf_nat_unknown_protocol) { |
| 526 | ret = -EBUSY; |
| 527 | goto out; |
| 528 | } |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 529 | rcu_assign_pointer(nf_nat_protos[proto->protonum], proto); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 530 | out: |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 531 | spin_unlock_bh(&nf_nat_lock); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 532 | return ret; |
| 533 | } |
| 534 | EXPORT_SYMBOL(nf_nat_protocol_register); |
| 535 | |
| 536 | /* Noone stores the protocol anywhere; simply delete it. */ |
Patrick McHardy | 2b628a0 | 2007-12-17 22:37:36 -0800 | [diff] [blame] | 537 | void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 538 | { |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 539 | spin_lock_bh(&nf_nat_lock); |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 540 | rcu_assign_pointer(nf_nat_protos[proto->protonum], |
| 541 | &nf_nat_unknown_protocol); |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 542 | spin_unlock_bh(&nf_nat_lock); |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 543 | synchronize_rcu(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 544 | } |
| 545 | EXPORT_SYMBOL(nf_nat_protocol_unregister); |
| 546 | |
Yasuyuki Kozakai | d8a0509 | 2007-07-07 22:26:16 -0700 | [diff] [blame] | 547 | /* Noone using conntrack by the time this called. */ |
| 548 | static void nf_nat_cleanup_conntrack(struct nf_conn *ct) |
| 549 | { |
| 550 | struct nf_conn_nat *nat = nf_ct_ext_find(ct, NF_CT_EXT_NAT); |
| 551 | |
Yasuyuki Kozakai | b6b84d4 | 2007-07-07 22:26:35 -0700 | [diff] [blame] | 552 | if (nat == NULL || nat->ct == NULL) |
Yasuyuki Kozakai | d8a0509 | 2007-07-07 22:26:16 -0700 | [diff] [blame] | 553 | return; |
| 554 | |
Yasuyuki Kozakai | b6b84d4 | 2007-07-07 22:26:35 -0700 | [diff] [blame] | 555 | NF_CT_ASSERT(nat->ct->status & IPS_NAT_DONE_MASK); |
Yasuyuki Kozakai | d8a0509 | 2007-07-07 22:26:16 -0700 | [diff] [blame] | 556 | |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 557 | spin_lock_bh(&nf_nat_lock); |
Patrick McHardy | 4d354c5 | 2008-01-31 04:42:37 -0800 | [diff] [blame] | 558 | hlist_del_rcu(&nat->bysource); |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 559 | spin_unlock_bh(&nf_nat_lock); |
Yasuyuki Kozakai | d8a0509 | 2007-07-07 22:26:16 -0700 | [diff] [blame] | 560 | } |
| 561 | |
Patrick McHardy | 86577c6 | 2008-02-07 17:56:34 -0800 | [diff] [blame] | 562 | static void nf_nat_move_storage(void *new, void *old) |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 563 | { |
Patrick McHardy | 86577c6 | 2008-02-07 17:56:34 -0800 | [diff] [blame] | 564 | struct nf_conn_nat *new_nat = new; |
| 565 | struct nf_conn_nat *old_nat = old; |
Yasuyuki Kozakai | b6b84d4 | 2007-07-07 22:26:35 -0700 | [diff] [blame] | 566 | struct nf_conn *ct = old_nat->ct; |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 567 | |
Evgeniy Polyakov | 1f30532 | 2007-11-20 04:27:35 -0800 | [diff] [blame] | 568 | if (!ct || !(ct->status & IPS_NAT_DONE_MASK)) |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 569 | return; |
| 570 | |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 571 | spin_lock_bh(&nf_nat_lock); |
Yasuyuki Kozakai | b6b84d4 | 2007-07-07 22:26:35 -0700 | [diff] [blame] | 572 | new_nat->ct = ct; |
Patrick McHardy | 68b80f1 | 2008-06-17 15:51:47 -0700 | [diff] [blame] | 573 | hlist_replace_rcu(&old_nat->bysource, &new_nat->bysource); |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 574 | spin_unlock_bh(&nf_nat_lock); |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 575 | } |
| 576 | |
Patrick McHardy | 61eb310 | 2007-07-07 22:27:06 -0700 | [diff] [blame] | 577 | static struct nf_ct_ext_type nat_extend __read_mostly = { |
Yasuyuki Kozakai | d8a0509 | 2007-07-07 22:26:16 -0700 | [diff] [blame] | 578 | .len = sizeof(struct nf_conn_nat), |
| 579 | .align = __alignof__(struct nf_conn_nat), |
| 580 | .destroy = nf_nat_cleanup_conntrack, |
| 581 | .move = nf_nat_move_storage, |
| 582 | .id = NF_CT_EXT_NAT, |
| 583 | .flags = NF_CT_EXT_F_PREALLOC, |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 584 | }; |
| 585 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 586 | static int __init nf_nat_init(void) |
| 587 | { |
| 588 | size_t i; |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 589 | int ret; |
| 590 | |
Jan Engelhardt | 475959d | 2008-04-09 15:14:58 -0700 | [diff] [blame] | 591 | need_ipv4_conntrack(); |
| 592 | |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 593 | ret = nf_ct_extend_register(&nat_extend); |
| 594 | if (ret < 0) { |
| 595 | printk(KERN_ERR "nf_nat_core: Unable to register extension\n"); |
| 596 | return ret; |
| 597 | } |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 598 | |
| 599 | /* Leave them the same for the moment. */ |
| 600 | nf_nat_htable_size = nf_conntrack_htable_size; |
| 601 | |
Patrick McHardy | 53aba59 | 2007-07-07 22:30:27 -0700 | [diff] [blame] | 602 | bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size, |
| 603 | &nf_nat_vmalloced); |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 604 | if (!bysource) { |
| 605 | ret = -ENOMEM; |
| 606 | goto cleanup_extend; |
| 607 | } |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 608 | |
| 609 | /* Sew in builtin protocols. */ |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 610 | spin_lock_bh(&nf_nat_lock); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 611 | for (i = 0; i < MAX_IP_NAT_PROTO; i++) |
Patrick McHardy | e22a054 | 2007-02-12 11:12:26 -0800 | [diff] [blame] | 612 | rcu_assign_pointer(nf_nat_protos[i], &nf_nat_unknown_protocol); |
| 613 | rcu_assign_pointer(nf_nat_protos[IPPROTO_TCP], &nf_nat_protocol_tcp); |
| 614 | rcu_assign_pointer(nf_nat_protos[IPPROTO_UDP], &nf_nat_protocol_udp); |
| 615 | rcu_assign_pointer(nf_nat_protos[IPPROTO_ICMP], &nf_nat_protocol_icmp); |
Patrick McHardy | 02502f6 | 2008-01-31 04:43:06 -0800 | [diff] [blame] | 616 | spin_unlock_bh(&nf_nat_lock); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 617 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 618 | /* Initialize fake conntrack so that NAT will skip it */ |
| 619 | nf_conntrack_untracked.status |= IPS_NAT_DONE_MASK; |
| 620 | |
| 621 | l3proto = nf_ct_l3proto_find_get((u_int16_t)AF_INET); |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 622 | |
| 623 | BUG_ON(nf_nat_seq_adjust_hook != NULL); |
| 624 | rcu_assign_pointer(nf_nat_seq_adjust_hook, nf_nat_seq_adjust); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 625 | return 0; |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 626 | |
| 627 | cleanup_extend: |
| 628 | nf_ct_extend_unregister(&nat_extend); |
| 629 | return ret; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | /* Clear NAT section of all conntracks, in case we're loaded again. */ |
| 633 | static int clean_nat(struct nf_conn *i, void *data) |
| 634 | { |
| 635 | struct nf_conn_nat *nat = nfct_nat(i); |
| 636 | |
| 637 | if (!nat) |
| 638 | return 0; |
Li Zefan | e0bf9cf | 2007-11-13 02:57:16 -0800 | [diff] [blame] | 639 | memset(nat, 0, sizeof(*nat)); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 640 | i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST); |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | static void __exit nf_nat_cleanup(void) |
| 645 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 646 | nf_ct_iterate_cleanup(&init_net, &clean_nat, NULL); |
Patrick McHardy | 982d9a9 | 2007-02-12 11:14:11 -0800 | [diff] [blame] | 647 | synchronize_rcu(); |
Patrick McHardy | 53aba59 | 2007-07-07 22:30:27 -0700 | [diff] [blame] | 648 | nf_ct_free_hashtable(bysource, nf_nat_vmalloced, nf_nat_htable_size); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 649 | nf_ct_l3proto_put(l3proto); |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 650 | nf_ct_extend_unregister(&nat_extend); |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 651 | rcu_assign_pointer(nf_nat_seq_adjust_hook, NULL); |
| 652 | synchronize_net(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 653 | } |
| 654 | |
| 655 | MODULE_LICENSE("GPL"); |
| 656 | |
| 657 | module_init(nf_nat_init); |
| 658 | module_exit(nf_nat_cleanup); |