KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Transparent proxy support for Linux/iptables |
| 3 | * |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 4 | * Copyright (c) 2006-2010 BalaBit IT Ltd. |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 5 | * Author: Balazs Scheidler, Krisztian Kovacs |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | */ |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/ip.h> |
| 16 | #include <net/checksum.h> |
| 17 | #include <net/udp.h> |
| 18 | #include <net/inet_sock.h> |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 19 | #include <linux/inetdevice.h> |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 20 | #include <linux/netfilter/x_tables.h> |
| 21 | #include <linux/netfilter_ipv4/ip_tables.h> |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 22 | |
| 23 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 24 | |
| 25 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
| 26 | #define XT_TPROXY_HAVE_IPV6 1 |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 27 | #include <net/if_inet6.h> |
| 28 | #include <net/addrconf.h> |
| 29 | #include <linux/netfilter_ipv6/ip6_tables.h> |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 30 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 31 | #endif |
| 32 | |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 33 | #include <net/netfilter/nf_tproxy_core.h> |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 34 | #include <linux/netfilter/xt_TPROXY.h> |
| 35 | |
Florian Westphal | d503b30 | 2011-02-17 11:32:38 +0100 | [diff] [blame] | 36 | static bool tproxy_sk_is_transparent(struct sock *sk) |
| 37 | { |
| 38 | if (sk->sk_state != TCP_TIME_WAIT) { |
| 39 | if (inet_sk(sk)->transparent) |
| 40 | return true; |
| 41 | sock_put(sk); |
| 42 | } else { |
| 43 | if (inet_twsk(sk)->tw_transparent) |
| 44 | return true; |
| 45 | inet_twsk_put(inet_twsk(sk)); |
| 46 | } |
| 47 | return false; |
| 48 | } |
| 49 | |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 50 | static inline __be32 |
| 51 | tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr) |
| 52 | { |
| 53 | struct in_device *indev; |
| 54 | __be32 laddr; |
| 55 | |
| 56 | if (user_laddr) |
| 57 | return user_laddr; |
| 58 | |
| 59 | laddr = 0; |
| 60 | rcu_read_lock(); |
| 61 | indev = __in_dev_get_rcu(skb->dev); |
| 62 | for_primary_ifa(indev) { |
| 63 | laddr = ifa->ifa_local; |
| 64 | break; |
| 65 | } endfor_ifa(indev); |
| 66 | rcu_read_unlock(); |
| 67 | |
| 68 | return laddr ? laddr : daddr; |
| 69 | } |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 70 | |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 71 | /** |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 72 | * tproxy_handle_time_wait4() - handle IPv4 TCP TIME_WAIT reopen redirections |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 73 | * @skb: The skb being processed. |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 74 | * @laddr: IPv4 address to redirect to or zero. |
| 75 | * @lport: TCP port to redirect to or zero. |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 76 | * @sk: The TIME_WAIT TCP socket found by the lookup. |
| 77 | * |
| 78 | * We have to handle SYN packets arriving to TIME_WAIT sockets |
| 79 | * differently: instead of reopening the connection we should rather |
| 80 | * redirect the new connection to the proxy if there's a listener |
| 81 | * socket present. |
| 82 | * |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 83 | * tproxy_handle_time_wait4() consumes the socket reference passed in. |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 84 | * |
| 85 | * Returns the listener socket if there's one, the TIME_WAIT socket if |
| 86 | * no such listener is found, or NULL if the TCP header is incomplete. |
| 87 | */ |
| 88 | static struct sock * |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 89 | tproxy_handle_time_wait4(struct sk_buff *skb, __be32 laddr, __be16 lport, |
| 90 | struct sock *sk) |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 91 | { |
| 92 | const struct iphdr *iph = ip_hdr(skb); |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 93 | struct tcphdr _hdr, *hp; |
| 94 | |
| 95 | hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr); |
| 96 | if (hp == NULL) { |
| 97 | inet_twsk_put(inet_twsk(sk)); |
| 98 | return NULL; |
| 99 | } |
| 100 | |
| 101 | if (hp->syn && !hp->rst && !hp->ack && !hp->fin) { |
| 102 | /* SYN to a TIME_WAIT socket, we'd rather redirect it |
| 103 | * to a listener socket if there's one */ |
| 104 | struct sock *sk2; |
| 105 | |
| 106 | sk2 = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol, |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 107 | iph->saddr, laddr ? laddr : iph->daddr, |
| 108 | hp->source, lport ? lport : hp->dest, |
| 109 | skb->dev, NFT_LOOKUP_LISTENER); |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 110 | if (sk2) { |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 111 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
| 112 | inet_twsk_put(inet_twsk(sk)); |
| 113 | sk = sk2; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | return sk; |
| 118 | } |
| 119 | |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 120 | static unsigned int |
| 121 | tproxy_tg4(struct sk_buff *skb, __be32 laddr, __be16 lport, |
| 122 | u_int32_t mark_mask, u_int32_t mark_value) |
| 123 | { |
| 124 | const struct iphdr *iph = ip_hdr(skb); |
| 125 | struct udphdr _hdr, *hp; |
| 126 | struct sock *sk; |
| 127 | |
| 128 | hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr); |
| 129 | if (hp == NULL) |
| 130 | return NF_DROP; |
| 131 | |
| 132 | /* check if there's an ongoing connection on the packet |
| 133 | * addresses, this happens if the redirect already happened |
| 134 | * and the current packet belongs to an already established |
| 135 | * connection */ |
| 136 | sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol, |
| 137 | iph->saddr, iph->daddr, |
| 138 | hp->source, hp->dest, |
| 139 | skb->dev, NFT_LOOKUP_ESTABLISHED); |
| 140 | |
| 141 | laddr = tproxy_laddr4(skb, laddr, iph->daddr); |
| 142 | if (!lport) |
| 143 | lport = hp->dest; |
| 144 | |
| 145 | /* UDP has no TCP_TIME_WAIT state, so we never enter here */ |
| 146 | if (sk && sk->sk_state == TCP_TIME_WAIT) |
| 147 | /* reopening a TIME_WAIT connection needs special handling */ |
| 148 | sk = tproxy_handle_time_wait4(skb, laddr, lport, sk); |
| 149 | else if (!sk) |
| 150 | /* no, there's no established connection, check if |
| 151 | * there's a listener on the redirected addr/port */ |
| 152 | sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol, |
| 153 | iph->saddr, laddr, |
| 154 | hp->source, lport, |
| 155 | skb->dev, NFT_LOOKUP_LISTENER); |
| 156 | |
| 157 | /* NOTE: assign_sock consumes our sk reference */ |
Florian Westphal | d503b30 | 2011-02-17 11:32:38 +0100 | [diff] [blame] | 158 | if (sk && tproxy_sk_is_transparent(sk)) { |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 159 | /* This should be in a separate target, but we don't do multiple |
| 160 | targets on the same rule yet */ |
| 161 | skb->mark = (skb->mark & ~mark_mask) ^ mark_value; |
| 162 | |
| 163 | pr_debug("redirecting: proto %hhu %pI4:%hu -> %pI4:%hu, mark: %x\n", |
| 164 | iph->protocol, &iph->daddr, ntohs(hp->dest), |
| 165 | &laddr, ntohs(lport), skb->mark); |
Florian Westphal | d503b30 | 2011-02-17 11:32:38 +0100 | [diff] [blame] | 166 | |
| 167 | nf_tproxy_assign_sock(skb, sk); |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 168 | return NF_ACCEPT; |
| 169 | } |
| 170 | |
| 171 | pr_debug("no socket, dropping: proto %hhu %pI4:%hu -> %pI4:%hu, mark: %x\n", |
| 172 | iph->protocol, &iph->saddr, ntohs(hp->source), |
| 173 | &iph->daddr, ntohs(hp->dest), skb->mark); |
| 174 | return NF_DROP; |
| 175 | } |
| 176 | |
| 177 | static unsigned int |
| 178 | tproxy_tg4_v0(struct sk_buff *skb, const struct xt_action_param *par) |
| 179 | { |
| 180 | const struct xt_tproxy_target_info *tgi = par->targinfo; |
| 181 | |
| 182 | return tproxy_tg4(skb, tgi->laddr, tgi->lport, tgi->mark_mask, tgi->mark_value); |
| 183 | } |
| 184 | |
| 185 | static unsigned int |
| 186 | tproxy_tg4_v1(struct sk_buff *skb, const struct xt_action_param *par) |
| 187 | { |
| 188 | const struct xt_tproxy_target_info_v1 *tgi = par->targinfo; |
| 189 | |
| 190 | return tproxy_tg4(skb, tgi->laddr.ip, tgi->lport, tgi->mark_mask, tgi->mark_value); |
| 191 | } |
| 192 | |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 193 | #ifdef XT_TPROXY_HAVE_IPV6 |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 194 | |
| 195 | static inline const struct in6_addr * |
| 196 | tproxy_laddr6(struct sk_buff *skb, const struct in6_addr *user_laddr, |
| 197 | const struct in6_addr *daddr) |
| 198 | { |
| 199 | struct inet6_dev *indev; |
| 200 | struct inet6_ifaddr *ifa; |
| 201 | struct in6_addr *laddr; |
| 202 | |
| 203 | if (!ipv6_addr_any(user_laddr)) |
| 204 | return user_laddr; |
| 205 | laddr = NULL; |
| 206 | |
| 207 | rcu_read_lock(); |
| 208 | indev = __in6_dev_get(skb->dev); |
| 209 | if (indev) |
| 210 | list_for_each_entry(ifa, &indev->addr_list, if_list) { |
| 211 | if (ifa->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED)) |
| 212 | continue; |
| 213 | |
| 214 | laddr = &ifa->addr; |
| 215 | break; |
| 216 | } |
| 217 | rcu_read_unlock(); |
| 218 | |
| 219 | return laddr ? laddr : daddr; |
| 220 | } |
| 221 | |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 222 | /** |
| 223 | * tproxy_handle_time_wait6() - handle IPv6 TCP TIME_WAIT reopen redirections |
| 224 | * @skb: The skb being processed. |
| 225 | * @tproto: Transport protocol. |
| 226 | * @thoff: Transport protocol header offset. |
| 227 | * @par: Iptables target parameters. |
| 228 | * @sk: The TIME_WAIT TCP socket found by the lookup. |
| 229 | * |
| 230 | * We have to handle SYN packets arriving to TIME_WAIT sockets |
| 231 | * differently: instead of reopening the connection we should rather |
| 232 | * redirect the new connection to the proxy if there's a listener |
| 233 | * socket present. |
| 234 | * |
| 235 | * tproxy_handle_time_wait6() consumes the socket reference passed in. |
| 236 | * |
| 237 | * Returns the listener socket if there's one, the TIME_WAIT socket if |
| 238 | * no such listener is found, or NULL if the TCP header is incomplete. |
| 239 | */ |
| 240 | static struct sock * |
| 241 | tproxy_handle_time_wait6(struct sk_buff *skb, int tproto, int thoff, |
| 242 | const struct xt_action_param *par, |
| 243 | struct sock *sk) |
| 244 | { |
| 245 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
| 246 | struct tcphdr _hdr, *hp; |
| 247 | const struct xt_tproxy_target_info_v1 *tgi = par->targinfo; |
| 248 | |
| 249 | hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr); |
| 250 | if (hp == NULL) { |
| 251 | inet_twsk_put(inet_twsk(sk)); |
| 252 | return NULL; |
| 253 | } |
| 254 | |
| 255 | if (hp->syn && !hp->rst && !hp->ack && !hp->fin) { |
| 256 | /* SYN to a TIME_WAIT socket, we'd rather redirect it |
| 257 | * to a listener socket if there's one */ |
| 258 | struct sock *sk2; |
| 259 | |
| 260 | sk2 = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto, |
| 261 | &iph->saddr, |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 262 | tproxy_laddr6(skb, &tgi->laddr.in6, &iph->daddr), |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 263 | hp->source, |
| 264 | tgi->lport ? tgi->lport : hp->dest, |
| 265 | skb->dev, NFT_LOOKUP_LISTENER); |
| 266 | if (sk2) { |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 267 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
| 268 | inet_twsk_put(inet_twsk(sk)); |
| 269 | sk = sk2; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | return sk; |
| 274 | } |
| 275 | |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 276 | static unsigned int |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 277 | tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par) |
| 278 | { |
| 279 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
| 280 | const struct xt_tproxy_target_info_v1 *tgi = par->targinfo; |
| 281 | struct udphdr _hdr, *hp; |
| 282 | struct sock *sk; |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 283 | const struct in6_addr *laddr; |
| 284 | __be16 lport; |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 285 | int thoff; |
| 286 | int tproto; |
| 287 | |
| 288 | tproto = ipv6_find_hdr(skb, &thoff, -1, NULL); |
| 289 | if (tproto < 0) { |
| 290 | pr_debug("unable to find transport header in IPv6 packet, dropping\n"); |
| 291 | return NF_DROP; |
| 292 | } |
| 293 | |
| 294 | hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr); |
| 295 | if (hp == NULL) { |
| 296 | pr_debug("unable to grab transport header contents in IPv6 packet, dropping\n"); |
| 297 | return NF_DROP; |
| 298 | } |
| 299 | |
| 300 | /* check if there's an ongoing connection on the packet |
| 301 | * addresses, this happens if the redirect already happened |
| 302 | * and the current packet belongs to an already established |
| 303 | * connection */ |
| 304 | sk = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto, |
| 305 | &iph->saddr, &iph->daddr, |
| 306 | hp->source, hp->dest, |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 307 | par->in, NFT_LOOKUP_ESTABLISHED); |
| 308 | |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 309 | laddr = tproxy_laddr6(skb, &tgi->laddr.in6, &iph->daddr); |
| 310 | lport = tgi->lport ? tgi->lport : hp->dest; |
| 311 | |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 312 | /* UDP has no TCP_TIME_WAIT state, so we never enter here */ |
| 313 | if (sk && sk->sk_state == TCP_TIME_WAIT) |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 314 | /* reopening a TIME_WAIT connection needs special handling */ |
| 315 | sk = tproxy_handle_time_wait6(skb, tproto, thoff, par, sk); |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 316 | else if (!sk) |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 317 | /* no there's no established connection, check if |
| 318 | * there's a listener on the redirected addr/port */ |
| 319 | sk = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto, |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 320 | &iph->saddr, laddr, |
| 321 | hp->source, lport, |
Balazs Scheidler | 106e4c2 | 2010-10-21 12:45:14 +0200 | [diff] [blame] | 322 | par->in, NFT_LOOKUP_LISTENER); |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 323 | |
| 324 | /* NOTE: assign_sock consumes our sk reference */ |
Florian Westphal | d503b30 | 2011-02-17 11:32:38 +0100 | [diff] [blame] | 325 | if (sk && tproxy_sk_is_transparent(sk)) { |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 326 | /* This should be in a separate target, but we don't do multiple |
| 327 | targets on the same rule yet */ |
| 328 | skb->mark = (skb->mark & ~tgi->mark_mask) ^ tgi->mark_value; |
| 329 | |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 330 | pr_debug("redirecting: proto %hhu %pI6:%hu -> %pI6:%hu, mark: %x\n", |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 331 | tproto, &iph->saddr, ntohs(hp->source), |
| 332 | laddr, ntohs(lport), skb->mark); |
Florian Westphal | d503b30 | 2011-02-17 11:32:38 +0100 | [diff] [blame] | 333 | |
| 334 | nf_tproxy_assign_sock(skb, sk); |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 335 | return NF_ACCEPT; |
| 336 | } |
| 337 | |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 338 | pr_debug("no socket, dropping: proto %hhu %pI6:%hu -> %pI6:%hu, mark: %x\n", |
Balazs Scheidler | cc6eb43 | 2010-10-21 16:21:10 +0200 | [diff] [blame] | 339 | tproto, &iph->saddr, ntohs(hp->source), |
| 340 | &iph->daddr, ntohs(hp->dest), skb->mark); |
| 341 | |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 342 | return NF_DROP; |
| 343 | } |
| 344 | |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 345 | static int tproxy_tg6_check(const struct xt_tgchk_param *par) |
| 346 | { |
| 347 | const struct ip6t_ip6 *i = par->entryinfo; |
| 348 | |
| 349 | if ((i->proto == IPPROTO_TCP || i->proto == IPPROTO_UDP) |
| 350 | && !(i->flags & IP6T_INV_PROTO)) |
| 351 | return 0; |
| 352 | |
| 353 | pr_info("Can be used only in combination with " |
| 354 | "either -p tcp or -p udp\n"); |
| 355 | return -EINVAL; |
| 356 | } |
| 357 | #endif |
| 358 | |
| 359 | static int tproxy_tg4_check(const struct xt_tgchk_param *par) |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 360 | { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 361 | const struct ipt_ip *i = par->entryinfo; |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 362 | |
| 363 | if ((i->proto == IPPROTO_TCP || i->proto == IPPROTO_UDP) |
| 364 | && !(i->invflags & IPT_INV_PROTO)) |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 365 | return 0; |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 366 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 367 | pr_info("Can be used only in combination with " |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 368 | "either -p tcp or -p udp\n"); |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 369 | return -EINVAL; |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 370 | } |
| 371 | |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 372 | static struct xt_target tproxy_tg_reg[] __read_mostly = { |
| 373 | { |
| 374 | .name = "TPROXY", |
| 375 | .family = NFPROTO_IPV4, |
| 376 | .table = "mangle", |
| 377 | .target = tproxy_tg4_v0, |
| 378 | .revision = 0, |
| 379 | .targetsize = sizeof(struct xt_tproxy_target_info), |
| 380 | .checkentry = tproxy_tg4_check, |
| 381 | .hooks = 1 << NF_INET_PRE_ROUTING, |
| 382 | .me = THIS_MODULE, |
| 383 | }, |
| 384 | { |
| 385 | .name = "TPROXY", |
| 386 | .family = NFPROTO_IPV4, |
| 387 | .table = "mangle", |
| 388 | .target = tproxy_tg4_v1, |
| 389 | .revision = 1, |
| 390 | .targetsize = sizeof(struct xt_tproxy_target_info_v1), |
| 391 | .checkentry = tproxy_tg4_check, |
| 392 | .hooks = 1 << NF_INET_PRE_ROUTING, |
| 393 | .me = THIS_MODULE, |
| 394 | }, |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 395 | #ifdef XT_TPROXY_HAVE_IPV6 |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 396 | { |
| 397 | .name = "TPROXY", |
| 398 | .family = NFPROTO_IPV6, |
| 399 | .table = "mangle", |
| 400 | .target = tproxy_tg6_v1, |
| 401 | .revision = 1, |
| 402 | .targetsize = sizeof(struct xt_tproxy_target_info_v1), |
| 403 | .checkentry = tproxy_tg6_check, |
| 404 | .hooks = 1 << NF_INET_PRE_ROUTING, |
| 405 | .me = THIS_MODULE, |
| 406 | }, |
| 407 | #endif |
| 408 | |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 409 | }; |
| 410 | |
| 411 | static int __init tproxy_tg_init(void) |
| 412 | { |
| 413 | nf_defrag_ipv4_enable(); |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 414 | #ifdef XT_TPROXY_HAVE_IPV6 |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 415 | nf_defrag_ipv6_enable(); |
| 416 | #endif |
| 417 | |
| 418 | return xt_register_targets(tproxy_tg_reg, ARRAY_SIZE(tproxy_tg_reg)); |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | static void __exit tproxy_tg_exit(void) |
| 422 | { |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 423 | xt_unregister_targets(tproxy_tg_reg, ARRAY_SIZE(tproxy_tg_reg)); |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | module_init(tproxy_tg_init); |
| 427 | module_exit(tproxy_tg_exit); |
| 428 | MODULE_LICENSE("GPL"); |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 429 | MODULE_AUTHOR("Balazs Scheidler, Krisztian Kovacs"); |
KOVACS Krisztian | e843927 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 430 | MODULE_DESCRIPTION("Netfilter transparent proxy (TPROXY) target module."); |
| 431 | MODULE_ALIAS("ipt_TPROXY"); |
Balazs Scheidler | 6ad7889 | 2010-10-21 16:17:26 +0200 | [diff] [blame] | 432 | MODULE_ALIAS("ip6t_TPROXY"); |