Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 7 | */ |
| 8 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 9 | #include <linux/types.h> |
| 10 | #include <linux/ip.h> |
| 11 | #include <linux/netfilter.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/skbuff.h> |
| 14 | #include <linux/icmp.h> |
| 15 | #include <linux/sysctl.h> |
Patrick McHardy | 0ae2cfe | 2006-01-05 12:21:52 -0800 | [diff] [blame] | 16 | #include <net/route.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 17 | #include <net/ip.h> |
| 18 | |
| 19 | #include <linux/netfilter_ipv4.h> |
| 20 | #include <net/netfilter/nf_conntrack.h> |
| 21 | #include <net/netfilter/nf_conntrack_helper.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 22 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 23 | #include <net/netfilter/nf_conntrack_l3proto.h> |
| 24 | #include <net/netfilter/nf_conntrack_core.h> |
| 25 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
| 26 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 27 | static int ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, |
| 28 | struct nf_conntrack_tuple *tuple) |
| 29 | { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 30 | __be32 _addrs[2], *ap; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 31 | ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), |
| 32 | sizeof(u_int32_t) * 2, _addrs); |
| 33 | if (ap == NULL) |
| 34 | return 0; |
| 35 | |
| 36 | tuple->src.u3.ip = ap[0]; |
| 37 | tuple->dst.u3.ip = ap[1]; |
| 38 | |
| 39 | return 1; |
| 40 | } |
| 41 | |
| 42 | static int ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, |
| 43 | const struct nf_conntrack_tuple *orig) |
| 44 | { |
| 45 | tuple->src.u3.ip = orig->dst.u3.ip; |
| 46 | tuple->dst.u3.ip = orig->src.u3.ip; |
| 47 | |
| 48 | return 1; |
| 49 | } |
| 50 | |
| 51 | static int ipv4_print_tuple(struct seq_file *s, |
| 52 | const struct nf_conntrack_tuple *tuple) |
| 53 | { |
| 54 | return seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ", |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 55 | NIPQUAD(tuple->src.u3.ip), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 56 | NIPQUAD(tuple->dst.u3.ip)); |
| 57 | } |
| 58 | |
| 59 | static int ipv4_print_conntrack(struct seq_file *s, |
| 60 | const struct nf_conn *conntrack) |
| 61 | { |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | /* Returns new sk_buff, or NULL */ |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 66 | static int nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 67 | { |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 68 | int err; |
| 69 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 70 | skb_orphan(skb); |
| 71 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 72 | local_bh_disable(); |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 73 | err = ip_defrag(skb, user); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 74 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 75 | |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 76 | if (!err) |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 77 | ip_send_check(ip_hdr(skb)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 78 | |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 79 | return err; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 80 | } |
| 81 | |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 82 | static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
| 83 | unsigned int *dataoff, u_int8_t *protonum) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 84 | { |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 85 | struct iphdr _iph, *iph; |
| 86 | |
| 87 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); |
| 88 | if (iph == NULL) |
| 89 | return -NF_DROP; |
| 90 | |
Patrick McHardy | 0fb9670 | 2007-09-11 11:27:01 +0200 | [diff] [blame] | 91 | /* Conntrack defragments packets, we might still see fragments |
| 92 | * inside ICMP packets though. */ |
| 93 | if (iph->frag_off & htons(IP_OFFSET)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 94 | return -NF_DROP; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 95 | |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 96 | *dataoff = nhoff + (iph->ihl << 2); |
| 97 | *protonum = iph->protocol; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 98 | |
| 99 | return NF_ACCEPT; |
| 100 | } |
| 101 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 102 | static unsigned int ipv4_confirm(unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 103 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 104 | const struct net_device *in, |
| 105 | const struct net_device *out, |
| 106 | int (*okfn)(struct sk_buff *)) |
| 107 | { |
| 108 | /* We've seen it coming out the other side: confirm it */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 109 | return nf_conntrack_confirm(skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | static unsigned int ipv4_conntrack_help(unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 113 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 114 | const struct net_device *in, |
| 115 | const struct net_device *out, |
| 116 | int (*okfn)(struct sk_buff *)) |
| 117 | { |
| 118 | struct nf_conn *ct; |
| 119 | enum ip_conntrack_info ctinfo; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 120 | struct nf_conn_help *help; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 121 | struct nf_conntrack_helper *helper; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 122 | |
| 123 | /* This is where we call the helper: as the packet goes out. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 124 | ct = nf_ct_get(skb, &ctinfo); |
Patrick McHardy | 6442f1c | 2006-05-29 18:21:53 -0700 | [diff] [blame] | 125 | if (!ct || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY) |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 126 | return NF_ACCEPT; |
| 127 | |
| 128 | help = nfct_help(ct); |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 129 | if (!help) |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 130 | return NF_ACCEPT; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 131 | /* rcu_read_lock()ed by nf_hook_slow */ |
| 132 | helper = rcu_dereference(help->helper); |
| 133 | if (!helper) |
| 134 | return NF_ACCEPT; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 135 | return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 136 | ct, ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | static unsigned int ipv4_conntrack_defrag(unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 140 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 141 | const struct net_device *in, |
| 142 | const struct net_device *out, |
| 143 | int (*okfn)(struct sk_buff *)) |
| 144 | { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 145 | /* Previously seen (loopback)? Ignore. Do this before |
| 146 | fragment check. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 147 | if (skb->nfct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 148 | return NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 149 | |
| 150 | /* Gather fragments. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 151 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
| 152 | if (nf_ct_ipv4_gather_frags(skb, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 153 | hooknum == NF_INET_PRE_ROUTING ? |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 154 | IP_DEFRAG_CONNTRACK_IN : |
| 155 | IP_DEFRAG_CONNTRACK_OUT)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 156 | return NF_STOLEN; |
| 157 | } |
| 158 | return NF_ACCEPT; |
| 159 | } |
| 160 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 161 | static unsigned int ipv4_conntrack_in(unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 162 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 163 | const struct net_device *in, |
| 164 | const struct net_device *out, |
| 165 | int (*okfn)(struct sk_buff *)) |
| 166 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 167 | return nf_conntrack_in(PF_INET, hooknum, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | static unsigned int ipv4_conntrack_local(unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 171 | struct sk_buff *skb, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 172 | const struct net_device *in, |
| 173 | const struct net_device *out, |
| 174 | int (*okfn)(struct sk_buff *)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 175 | { |
| 176 | /* root is playing with raw sockets. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 177 | if (skb->len < sizeof(struct iphdr) || |
| 178 | ip_hdrlen(skb) < sizeof(struct iphdr)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 179 | if (net_ratelimit()) |
| 180 | printk("ipt_hook: happy cracking.\n"); |
| 181 | return NF_ACCEPT; |
| 182 | } |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 183 | return nf_conntrack_in(PF_INET, hooknum, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | /* Connection tracking may drop packets, but never alters them, so |
| 187 | make it the first hook. */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame^] | 188 | static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = { |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 189 | { |
| 190 | .hook = ipv4_conntrack_defrag, |
| 191 | .owner = THIS_MODULE, |
| 192 | .pf = PF_INET, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 193 | .hooknum = NF_INET_PRE_ROUTING, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 194 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, |
| 195 | }, |
| 196 | { |
| 197 | .hook = ipv4_conntrack_in, |
| 198 | .owner = THIS_MODULE, |
| 199 | .pf = PF_INET, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 200 | .hooknum = NF_INET_PRE_ROUTING, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 201 | .priority = NF_IP_PRI_CONNTRACK, |
| 202 | }, |
| 203 | { |
| 204 | .hook = ipv4_conntrack_defrag, |
| 205 | .owner = THIS_MODULE, |
| 206 | .pf = PF_INET, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 207 | .hooknum = NF_INET_LOCAL_OUT, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 208 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, |
| 209 | }, |
| 210 | { |
| 211 | .hook = ipv4_conntrack_local, |
| 212 | .owner = THIS_MODULE, |
| 213 | .pf = PF_INET, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 214 | .hooknum = NF_INET_LOCAL_OUT, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 215 | .priority = NF_IP_PRI_CONNTRACK, |
| 216 | }, |
| 217 | { |
| 218 | .hook = ipv4_conntrack_help, |
| 219 | .owner = THIS_MODULE, |
| 220 | .pf = PF_INET, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 221 | .hooknum = NF_INET_POST_ROUTING, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 222 | .priority = NF_IP_PRI_CONNTRACK_HELPER, |
| 223 | }, |
| 224 | { |
| 225 | .hook = ipv4_conntrack_help, |
| 226 | .owner = THIS_MODULE, |
| 227 | .pf = PF_INET, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 228 | .hooknum = NF_INET_LOCAL_IN, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 229 | .priority = NF_IP_PRI_CONNTRACK_HELPER, |
| 230 | }, |
| 231 | { |
| 232 | .hook = ipv4_confirm, |
| 233 | .owner = THIS_MODULE, |
| 234 | .pf = PF_INET, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 235 | .hooknum = NF_INET_POST_ROUTING, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 236 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
| 237 | }, |
| 238 | { |
| 239 | .hook = ipv4_confirm, |
| 240 | .owner = THIS_MODULE, |
| 241 | .pf = PF_INET, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 242 | .hooknum = NF_INET_LOCAL_IN, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 243 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
| 244 | }, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 245 | }; |
| 246 | |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 247 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 248 | static int log_invalid_proto_min = 0; |
| 249 | static int log_invalid_proto_max = 255; |
| 250 | |
| 251 | static ctl_table ip_ct_sysctl_table[] = { |
| 252 | { |
| 253 | .ctl_name = NET_IPV4_NF_CONNTRACK_MAX, |
| 254 | .procname = "ip_conntrack_max", |
| 255 | .data = &nf_conntrack_max, |
| 256 | .maxlen = sizeof(int), |
| 257 | .mode = 0644, |
| 258 | .proc_handler = &proc_dointvec, |
| 259 | }, |
| 260 | { |
| 261 | .ctl_name = NET_IPV4_NF_CONNTRACK_COUNT, |
| 262 | .procname = "ip_conntrack_count", |
| 263 | .data = &nf_conntrack_count, |
| 264 | .maxlen = sizeof(int), |
| 265 | .mode = 0444, |
| 266 | .proc_handler = &proc_dointvec, |
| 267 | }, |
| 268 | { |
| 269 | .ctl_name = NET_IPV4_NF_CONNTRACK_BUCKETS, |
| 270 | .procname = "ip_conntrack_buckets", |
| 271 | .data = &nf_conntrack_htable_size, |
| 272 | .maxlen = sizeof(unsigned int), |
| 273 | .mode = 0444, |
| 274 | .proc_handler = &proc_dointvec, |
| 275 | }, |
| 276 | { |
| 277 | .ctl_name = NET_IPV4_NF_CONNTRACK_CHECKSUM, |
| 278 | .procname = "ip_conntrack_checksum", |
| 279 | .data = &nf_conntrack_checksum, |
| 280 | .maxlen = sizeof(int), |
| 281 | .mode = 0644, |
| 282 | .proc_handler = &proc_dointvec, |
| 283 | }, |
| 284 | { |
| 285 | .ctl_name = NET_IPV4_NF_CONNTRACK_LOG_INVALID, |
| 286 | .procname = "ip_conntrack_log_invalid", |
| 287 | .data = &nf_ct_log_invalid, |
| 288 | .maxlen = sizeof(unsigned int), |
| 289 | .mode = 0644, |
| 290 | .proc_handler = &proc_dointvec_minmax, |
| 291 | .strategy = &sysctl_intvec, |
| 292 | .extra1 = &log_invalid_proto_min, |
| 293 | .extra2 = &log_invalid_proto_max, |
| 294 | }, |
| 295 | { |
| 296 | .ctl_name = 0 |
| 297 | } |
| 298 | }; |
| 299 | #endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
| 300 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 301 | /* Fast function for those who don't want to parse /proc (and I don't |
| 302 | blame them). */ |
| 303 | /* Reversing the socket's dst/src point of view gives us the reply |
| 304 | mapping. */ |
| 305 | static int |
| 306 | getorigdst(struct sock *sk, int optval, void __user *user, int *len) |
| 307 | { |
| 308 | struct inet_sock *inet = inet_sk(sk); |
| 309 | struct nf_conntrack_tuple_hash *h; |
| 310 | struct nf_conntrack_tuple tuple; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 311 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 312 | NF_CT_TUPLE_U_BLANK(&tuple); |
| 313 | tuple.src.u3.ip = inet->rcv_saddr; |
| 314 | tuple.src.u.tcp.port = inet->sport; |
| 315 | tuple.dst.u3.ip = inet->daddr; |
| 316 | tuple.dst.u.tcp.port = inet->dport; |
| 317 | tuple.src.l3num = PF_INET; |
| 318 | tuple.dst.protonum = IPPROTO_TCP; |
| 319 | |
| 320 | /* We only do TCP at the moment: is there a better way? */ |
| 321 | if (strcmp(sk->sk_prot->name, "TCP")) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 322 | pr_debug("SO_ORIGINAL_DST: Not a TCP socket\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 323 | return -ENOPROTOOPT; |
| 324 | } |
| 325 | |
| 326 | if ((unsigned int) *len < sizeof(struct sockaddr_in)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 327 | pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n", |
| 328 | *len, sizeof(struct sockaddr_in)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 329 | return -EINVAL; |
| 330 | } |
| 331 | |
Patrick McHardy | 330f7db | 2007-07-07 22:28:42 -0700 | [diff] [blame] | 332 | h = nf_conntrack_find_get(&tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 333 | if (h) { |
| 334 | struct sockaddr_in sin; |
| 335 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 336 | |
| 337 | sin.sin_family = AF_INET; |
| 338 | sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] |
| 339 | .tuple.dst.u.tcp.port; |
| 340 | sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] |
| 341 | .tuple.dst.u3.ip; |
Marcel Holtmann | 6c813c3 | 2006-05-28 22:50:18 -0700 | [diff] [blame] | 342 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 343 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 344 | pr_debug("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n", |
| 345 | NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 346 | nf_ct_put(ct); |
| 347 | if (copy_to_user(user, &sin, sizeof(sin)) != 0) |
| 348 | return -EFAULT; |
| 349 | else |
| 350 | return 0; |
| 351 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 352 | pr_debug("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n", |
| 353 | NIPQUAD(tuple.src.u3.ip), ntohs(tuple.src.u.tcp.port), |
| 354 | NIPQUAD(tuple.dst.u3.ip), ntohs(tuple.dst.u.tcp.port)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 355 | return -ENOENT; |
| 356 | } |
| 357 | |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame] | 358 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 359 | |
| 360 | #include <linux/netfilter/nfnetlink.h> |
| 361 | #include <linux/netfilter/nfnetlink_conntrack.h> |
| 362 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 363 | static int ipv4_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 364 | const struct nf_conntrack_tuple *tuple) |
| 365 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 366 | NLA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t), |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 367 | &tuple->src.u3.ip); |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 368 | NLA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t), |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 369 | &tuple->dst.u3.ip); |
| 370 | return 0; |
| 371 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 372 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 373 | return -1; |
| 374 | } |
| 375 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 376 | static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = { |
| 377 | [CTA_IP_V4_SRC] = { .type = NLA_U32 }, |
| 378 | [CTA_IP_V4_DST] = { .type = NLA_U32 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 379 | }; |
| 380 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 381 | static int ipv4_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 382 | struct nf_conntrack_tuple *t) |
| 383 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 384 | if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 385 | return -EINVAL; |
| 386 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 387 | t->src.u3.ip = *(__be32 *)nla_data(tb[CTA_IP_V4_SRC]); |
| 388 | t->dst.u3.ip = *(__be32 *)nla_data(tb[CTA_IP_V4_DST]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 389 | |
| 390 | return 0; |
| 391 | } |
| 392 | #endif |
| 393 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 394 | static struct nf_sockopt_ops so_getorigdst = { |
| 395 | .pf = PF_INET, |
| 396 | .get_optmin = SO_ORIGINAL_DST, |
| 397 | .get_optmax = SO_ORIGINAL_DST+1, |
| 398 | .get = &getorigdst, |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 399 | .owner = THIS_MODULE, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 400 | }; |
| 401 | |
Patrick McHardy | 61075af | 2007-07-14 20:48:19 -0700 | [diff] [blame] | 402 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 403 | .l3proto = PF_INET, |
| 404 | .name = "ipv4", |
| 405 | .pkt_to_tuple = ipv4_pkt_to_tuple, |
| 406 | .invert_tuple = ipv4_invert_tuple, |
| 407 | .print_tuple = ipv4_print_tuple, |
| 408 | .print_conntrack = ipv4_print_conntrack, |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 409 | .get_l4proto = ipv4_get_l4proto, |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame] | 410 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 411 | .tuple_to_nlattr = ipv4_tuple_to_nlattr, |
| 412 | .nlattr_to_tuple = ipv4_nlattr_to_tuple, |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 413 | .nla_policy = ipv4_nla_policy, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 414 | #endif |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 415 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 416 | .ctl_table_path = nf_net_ipv4_netfilter_sysctl_path, |
| 417 | .ctl_table = ip_ct_sysctl_table, |
| 418 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 419 | .me = THIS_MODULE, |
| 420 | }; |
| 421 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 422 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
| 423 | &nf_conntrack_htable_size, 0600); |
| 424 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 425 | MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); |
Patrick McHardy | d2483dd | 2006-12-02 22:06:05 -0800 | [diff] [blame] | 426 | MODULE_ALIAS("ip_conntrack"); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 427 | MODULE_LICENSE("GPL"); |
| 428 | |
| 429 | static int __init nf_conntrack_l3proto_ipv4_init(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 430 | { |
| 431 | int ret = 0; |
| 432 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 433 | need_conntrack(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 434 | |
| 435 | ret = nf_register_sockopt(&so_getorigdst); |
| 436 | if (ret < 0) { |
| 437 | printk(KERN_ERR "Unable to register netfilter socket option\n"); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 438 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 439 | } |
| 440 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 441 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_tcp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 442 | if (ret < 0) { |
| 443 | printk("nf_conntrack_ipv4: can't register tcp.\n"); |
| 444 | goto cleanup_sockopt; |
| 445 | } |
| 446 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 447 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 448 | if (ret < 0) { |
| 449 | printk("nf_conntrack_ipv4: can't register udp.\n"); |
| 450 | goto cleanup_tcp; |
| 451 | } |
| 452 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 453 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_icmp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 454 | if (ret < 0) { |
| 455 | printk("nf_conntrack_ipv4: can't register icmp.\n"); |
| 456 | goto cleanup_udp; |
| 457 | } |
| 458 | |
| 459 | ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4); |
| 460 | if (ret < 0) { |
| 461 | printk("nf_conntrack_ipv4: can't register ipv4\n"); |
| 462 | goto cleanup_icmp; |
| 463 | } |
| 464 | |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 465 | ret = nf_register_hooks(ipv4_conntrack_ops, |
| 466 | ARRAY_SIZE(ipv4_conntrack_ops)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 467 | if (ret < 0) { |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 468 | printk("nf_conntrack_ipv4: can't register hooks.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 469 | goto cleanup_ipv4; |
| 470 | } |
Patrick McHardy | e4bd8bc | 2006-11-29 02:35:22 +0100 | [diff] [blame] | 471 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 472 | ret = nf_conntrack_ipv4_compat_init(); |
| 473 | if (ret < 0) |
| 474 | goto cleanup_hooks; |
| 475 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 476 | return ret; |
Patrick McHardy | e4bd8bc | 2006-11-29 02:35:22 +0100 | [diff] [blame] | 477 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 478 | cleanup_hooks: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 479 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
Patrick McHardy | e4bd8bc | 2006-11-29 02:35:22 +0100 | [diff] [blame] | 480 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 481 | cleanup_ipv4: |
| 482 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4); |
| 483 | cleanup_icmp: |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 484 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 485 | cleanup_udp: |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 486 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 487 | cleanup_tcp: |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 488 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 489 | cleanup_sockopt: |
| 490 | nf_unregister_sockopt(&so_getorigdst); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 491 | return ret; |
| 492 | } |
| 493 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 494 | static void __exit nf_conntrack_l3proto_ipv4_fini(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 495 | { |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 496 | synchronize_net(); |
Patrick McHardy | e4bd8bc | 2006-11-29 02:35:22 +0100 | [diff] [blame] | 497 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 498 | nf_conntrack_ipv4_compat_fini(); |
| 499 | #endif |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 500 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
| 501 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 502 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmp); |
| 503 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp4); |
| 504 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp4); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 505 | nf_unregister_sockopt(&so_getorigdst); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 506 | } |
| 507 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 508 | module_init(nf_conntrack_l3proto_ipv4_init); |
| 509 | module_exit(nf_conntrack_l3proto_ipv4_fini); |
Patrick McHardy | 591e620 | 2007-08-07 18:12:01 -0700 | [diff] [blame] | 510 | |
| 511 | void need_ipv4_conntrack(void) |
| 512 | { |
| 513 | return; |
| 514 | } |
| 515 | EXPORT_SYMBOL_GPL(need_ipv4_conntrack); |