KOVACS Krisztian | 73e4022 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 1 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 2 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 3 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 8 | */ |
| 9 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 10 | #include <linux/types.h> |
| 11 | #include <linux/ip.h> |
| 12 | #include <linux/netfilter.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/icmp.h> |
| 16 | #include <linux/sysctl.h> |
Patrick McHardy | 0ae2cfe | 2006-01-05 12:21:52 -0800 | [diff] [blame] | 17 | #include <net/route.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 18 | #include <net/ip.h> |
| 19 | |
| 20 | #include <linux/netfilter_ipv4.h> |
| 21 | #include <net/netfilter/nf_conntrack.h> |
| 22 | #include <net/netfilter/nf_conntrack_helper.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 23 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 24 | #include <net/netfilter/nf_conntrack_l3proto.h> |
| 25 | #include <net/netfilter/nf_conntrack_core.h> |
| 26 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 27 | #include <net/netfilter/nf_nat_helper.h> |
KOVACS Krisztian | 73e4022 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 28 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> |
Patrick McHardy | 74f7a65 | 2009-08-25 15:33:08 +0200 | [diff] [blame] | 29 | #include <net/netfilter/nf_log.h> |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 30 | |
| 31 | int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, |
| 32 | struct nf_conn *ct, |
| 33 | enum ip_conntrack_info ctinfo); |
| 34 | EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 35 | |
Jan Engelhardt | 8ce8439 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 36 | static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, |
| 37 | struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 38 | { |
Jan Engelhardt | 3294858 | 2008-01-31 04:53:24 -0800 | [diff] [blame] | 39 | const __be32 *ap; |
| 40 | __be32 _addrs[2]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 41 | ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), |
| 42 | sizeof(u_int32_t) * 2, _addrs); |
| 43 | if (ap == NULL) |
Jan Engelhardt | 8ce8439 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 44 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 45 | |
| 46 | tuple->src.u3.ip = ap[0]; |
| 47 | tuple->dst.u3.ip = ap[1]; |
| 48 | |
Jan Engelhardt | 8ce8439 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 49 | return true; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 50 | } |
| 51 | |
Jan Engelhardt | 8ce8439 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 52 | static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, |
| 53 | const struct nf_conntrack_tuple *orig) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 54 | { |
| 55 | tuple->src.u3.ip = orig->dst.u3.ip; |
| 56 | tuple->dst.u3.ip = orig->src.u3.ip; |
| 57 | |
Jan Engelhardt | 8ce8439 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 58 | return true; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | static int ipv4_print_tuple(struct seq_file *s, |
| 62 | const struct nf_conntrack_tuple *tuple) |
| 63 | { |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 64 | return seq_printf(s, "src=%pI4 dst=%pI4 ", |
| 65 | &tuple->src.u3.ip, &tuple->dst.u3.ip); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 66 | } |
| 67 | |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 68 | static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
| 69 | unsigned int *dataoff, u_int8_t *protonum) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 70 | { |
Jan Engelhardt | 3294858 | 2008-01-31 04:53:24 -0800 | [diff] [blame] | 71 | const struct iphdr *iph; |
| 72 | struct iphdr _iph; |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 73 | |
| 74 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); |
| 75 | if (iph == NULL) |
| 76 | return -NF_DROP; |
| 77 | |
Patrick McHardy | 0fb9670 | 2007-09-11 11:27:01 +0200 | [diff] [blame] | 78 | /* Conntrack defragments packets, we might still see fragments |
| 79 | * inside ICMP packets though. */ |
| 80 | if (iph->frag_off & htons(IP_OFFSET)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 81 | return -NF_DROP; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 82 | |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 83 | *dataoff = nhoff + (iph->ihl << 2); |
| 84 | *protonum = iph->protocol; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 85 | |
| 86 | return NF_ACCEPT; |
| 87 | } |
| 88 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 89 | static unsigned int ipv4_confirm(unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 90 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 91 | const struct net_device *in, |
| 92 | const struct net_device *out, |
| 93 | int (*okfn)(struct sk_buff *)) |
| 94 | { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 95 | struct nf_conn *ct; |
| 96 | enum ip_conntrack_info ctinfo; |
Jan Engelhardt | 3294858 | 2008-01-31 04:53:24 -0800 | [diff] [blame] | 97 | const struct nf_conn_help *help; |
| 98 | const struct nf_conntrack_helper *helper; |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 99 | unsigned int ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 100 | |
| 101 | /* This is where we call the helper: as the packet goes out. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 102 | ct = nf_ct_get(skb, &ctinfo); |
Patrick McHardy | 6442f1c | 2006-05-29 18:21:53 -0700 | [diff] [blame] | 103 | if (!ct || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY) |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 104 | goto out; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 105 | |
| 106 | help = nfct_help(ct); |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 107 | if (!help) |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 108 | goto out; |
| 109 | |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 110 | /* rcu_read_lock()ed by nf_hook_slow */ |
| 111 | helper = rcu_dereference(help->helper); |
| 112 | if (!helper) |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 113 | goto out; |
| 114 | |
| 115 | ret = helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), |
| 116 | ct, ctinfo); |
Patrick McHardy | 74f7a65 | 2009-08-25 15:33:08 +0200 | [diff] [blame] | 117 | if (ret != NF_ACCEPT) { |
| 118 | nf_log_packet(NFPROTO_IPV4, hooknum, skb, in, out, NULL, |
| 119 | "nf_ct_%s: dropping packet", helper->name); |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 120 | return ret; |
Patrick McHardy | 74f7a65 | 2009-08-25 15:33:08 +0200 | [diff] [blame] | 121 | } |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 122 | |
| 123 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) { |
| 124 | typeof(nf_nat_seq_adjust_hook) seq_adjust; |
| 125 | |
| 126 | seq_adjust = rcu_dereference(nf_nat_seq_adjust_hook); |
Pablo Neira Ayuso | 1db7a74 | 2009-03-16 15:18:50 +0100 | [diff] [blame] | 127 | if (!seq_adjust || !seq_adjust(skb, ct, ctinfo)) { |
| 128 | NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop); |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 129 | return NF_DROP; |
Pablo Neira Ayuso | 1db7a74 | 2009-03-16 15:18:50 +0100 | [diff] [blame] | 130 | } |
Patrick McHardy | dd13b01 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 131 | } |
| 132 | out: |
| 133 | /* We've seen it coming out the other side: confirm it */ |
| 134 | return nf_conntrack_confirm(skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 135 | } |
| 136 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 137 | static unsigned int ipv4_conntrack_in(unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 138 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 139 | const struct net_device *in, |
| 140 | const struct net_device *out, |
| 141 | int (*okfn)(struct sk_buff *)) |
| 142 | { |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 143 | return nf_conntrack_in(dev_net(in), PF_INET, hooknum, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | static unsigned int ipv4_conntrack_local(unsigned int hooknum, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 147 | struct sk_buff *skb, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 148 | const struct net_device *in, |
| 149 | const struct net_device *out, |
| 150 | int (*okfn)(struct sk_buff *)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 151 | { |
| 152 | /* root is playing with raw sockets. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 153 | if (skb->len < sizeof(struct iphdr) || |
Patrick McHardy | 8884310 | 2009-01-12 00:06:00 +0000 | [diff] [blame] | 154 | ip_hdrlen(skb) < sizeof(struct iphdr)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 155 | return NF_ACCEPT; |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 156 | return nf_conntrack_in(dev_net(out), PF_INET, hooknum, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /* Connection tracking may drop packets, but never alters them, so |
| 160 | make it the first hook. */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 161 | static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = { |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 162 | { |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 163 | .hook = ipv4_conntrack_in, |
| 164 | .owner = THIS_MODULE, |
Jan Engelhardt | 57750a2 | 2009-06-13 06:22:18 +0200 | [diff] [blame] | 165 | .pf = NFPROTO_IPV4, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 166 | .hooknum = NF_INET_PRE_ROUTING, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 167 | .priority = NF_IP_PRI_CONNTRACK, |
| 168 | }, |
| 169 | { |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 170 | .hook = ipv4_conntrack_local, |
| 171 | .owner = THIS_MODULE, |
Jan Engelhardt | 57750a2 | 2009-06-13 06:22:18 +0200 | [diff] [blame] | 172 | .pf = NFPROTO_IPV4, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 173 | .hooknum = NF_INET_LOCAL_OUT, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 174 | .priority = NF_IP_PRI_CONNTRACK, |
| 175 | }, |
| 176 | { |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 177 | .hook = ipv4_confirm, |
| 178 | .owner = THIS_MODULE, |
Jan Engelhardt | 57750a2 | 2009-06-13 06:22:18 +0200 | [diff] [blame] | 179 | .pf = NFPROTO_IPV4, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 180 | .hooknum = NF_INET_POST_ROUTING, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 181 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
| 182 | }, |
| 183 | { |
| 184 | .hook = ipv4_confirm, |
| 185 | .owner = THIS_MODULE, |
Jan Engelhardt | 57750a2 | 2009-06-13 06:22:18 +0200 | [diff] [blame] | 186 | .pf = NFPROTO_IPV4, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 187 | .hooknum = NF_INET_LOCAL_IN, |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 188 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
| 189 | }, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 190 | }; |
| 191 | |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 192 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 193 | static int log_invalid_proto_min = 0; |
| 194 | static int log_invalid_proto_max = 255; |
| 195 | |
| 196 | static ctl_table ip_ct_sysctl_table[] = { |
| 197 | { |
| 198 | .ctl_name = NET_IPV4_NF_CONNTRACK_MAX, |
| 199 | .procname = "ip_conntrack_max", |
| 200 | .data = &nf_conntrack_max, |
| 201 | .maxlen = sizeof(int), |
| 202 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 203 | .proc_handler = proc_dointvec, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 204 | }, |
| 205 | { |
| 206 | .ctl_name = NET_IPV4_NF_CONNTRACK_COUNT, |
| 207 | .procname = "ip_conntrack_count", |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 208 | .data = &init_net.ct.count, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 209 | .maxlen = sizeof(int), |
| 210 | .mode = 0444, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 211 | .proc_handler = proc_dointvec, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 212 | }, |
| 213 | { |
| 214 | .ctl_name = NET_IPV4_NF_CONNTRACK_BUCKETS, |
| 215 | .procname = "ip_conntrack_buckets", |
| 216 | .data = &nf_conntrack_htable_size, |
| 217 | .maxlen = sizeof(unsigned int), |
| 218 | .mode = 0444, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 219 | .proc_handler = proc_dointvec, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 220 | }, |
| 221 | { |
| 222 | .ctl_name = NET_IPV4_NF_CONNTRACK_CHECKSUM, |
| 223 | .procname = "ip_conntrack_checksum", |
Alexey Dobriyan | c04d055 | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 224 | .data = &init_net.ct.sysctl_checksum, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 225 | .maxlen = sizeof(int), |
| 226 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 227 | .proc_handler = proc_dointvec, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 228 | }, |
| 229 | { |
| 230 | .ctl_name = NET_IPV4_NF_CONNTRACK_LOG_INVALID, |
| 231 | .procname = "ip_conntrack_log_invalid", |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 232 | .data = &init_net.ct.sysctl_log_invalid, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 233 | .maxlen = sizeof(unsigned int), |
| 234 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 235 | .proc_handler = proc_dointvec_minmax, |
| 236 | .strategy = sysctl_intvec, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 237 | .extra1 = &log_invalid_proto_min, |
| 238 | .extra2 = &log_invalid_proto_max, |
| 239 | }, |
| 240 | { |
| 241 | .ctl_name = 0 |
| 242 | } |
| 243 | }; |
| 244 | #endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
| 245 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 246 | /* Fast function for those who don't want to parse /proc (and I don't |
| 247 | blame them). */ |
| 248 | /* Reversing the socket's dst/src point of view gives us the reply |
| 249 | mapping. */ |
| 250 | static int |
| 251 | getorigdst(struct sock *sk, int optval, void __user *user, int *len) |
| 252 | { |
Jan Engelhardt | 3294858 | 2008-01-31 04:53:24 -0800 | [diff] [blame] | 253 | const struct inet_sock *inet = inet_sk(sk); |
| 254 | const struct nf_conntrack_tuple_hash *h; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 255 | struct nf_conntrack_tuple tuple; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 256 | |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 257 | memset(&tuple, 0, sizeof(tuple)); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame^] | 258 | tuple.src.u3.ip = inet->inet_rcv_saddr; |
| 259 | tuple.src.u.tcp.port = inet->inet_sport; |
| 260 | tuple.dst.u3.ip = inet->inet_daddr; |
| 261 | tuple.dst.u.tcp.port = inet->inet_dport; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 262 | tuple.src.l3num = PF_INET; |
Rafael Laufer | 5498127 | 2009-08-10 10:08:27 +0200 | [diff] [blame] | 263 | tuple.dst.protonum = sk->sk_protocol; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 264 | |
Rafael Laufer | 5498127 | 2009-08-10 10:08:27 +0200 | [diff] [blame] | 265 | /* We only do TCP and SCTP at the moment: is there a better way? */ |
| 266 | if (sk->sk_protocol != IPPROTO_TCP && sk->sk_protocol != IPPROTO_SCTP) { |
| 267 | pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 268 | return -ENOPROTOOPT; |
| 269 | } |
| 270 | |
| 271 | if ((unsigned int) *len < sizeof(struct sockaddr_in)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 272 | pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n", |
| 273 | *len, sizeof(struct sockaddr_in)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 274 | return -EINVAL; |
| 275 | } |
| 276 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 277 | h = nf_conntrack_find_get(sock_net(sk), &tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 278 | if (h) { |
| 279 | struct sockaddr_in sin; |
| 280 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 281 | |
| 282 | sin.sin_family = AF_INET; |
| 283 | sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] |
| 284 | .tuple.dst.u.tcp.port; |
| 285 | sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] |
| 286 | .tuple.dst.u3.ip; |
Marcel Holtmann | 6c813c3 | 2006-05-28 22:50:18 -0700 | [diff] [blame] | 287 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 288 | |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 289 | pr_debug("SO_ORIGINAL_DST: %pI4 %u\n", |
| 290 | &sin.sin_addr.s_addr, ntohs(sin.sin_port)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 291 | nf_ct_put(ct); |
| 292 | if (copy_to_user(user, &sin, sizeof(sin)) != 0) |
| 293 | return -EFAULT; |
| 294 | else |
| 295 | return 0; |
| 296 | } |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 297 | pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n", |
| 298 | &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port), |
| 299 | &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 300 | return -ENOENT; |
| 301 | } |
| 302 | |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame] | 303 | #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] | 304 | |
| 305 | #include <linux/netfilter/nfnetlink.h> |
| 306 | #include <linux/netfilter/nfnetlink_conntrack.h> |
| 307 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 308 | static int ipv4_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 309 | const struct nf_conntrack_tuple *tuple) |
| 310 | { |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 311 | NLA_PUT_BE32(skb, CTA_IP_V4_SRC, tuple->src.u3.ip); |
| 312 | NLA_PUT_BE32(skb, CTA_IP_V4_DST, tuple->dst.u3.ip); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 313 | return 0; |
| 314 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 315 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 316 | return -1; |
| 317 | } |
| 318 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 319 | static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = { |
| 320 | [CTA_IP_V4_SRC] = { .type = NLA_U32 }, |
| 321 | [CTA_IP_V4_DST] = { .type = NLA_U32 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 322 | }; |
| 323 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 324 | static int ipv4_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 325 | struct nf_conntrack_tuple *t) |
| 326 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 327 | if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 328 | return -EINVAL; |
| 329 | |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 330 | t->src.u3.ip = nla_get_be32(tb[CTA_IP_V4_SRC]); |
| 331 | t->dst.u3.ip = nla_get_be32(tb[CTA_IP_V4_DST]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 332 | |
| 333 | return 0; |
| 334 | } |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 335 | |
| 336 | static int ipv4_nlattr_tuple_size(void) |
| 337 | { |
| 338 | return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1); |
| 339 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 340 | #endif |
| 341 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 342 | static struct nf_sockopt_ops so_getorigdst = { |
| 343 | .pf = PF_INET, |
| 344 | .get_optmin = SO_ORIGINAL_DST, |
| 345 | .get_optmax = SO_ORIGINAL_DST+1, |
| 346 | .get = &getorigdst, |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 347 | .owner = THIS_MODULE, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 348 | }; |
| 349 | |
Patrick McHardy | 61075af | 2007-07-14 20:48:19 -0700 | [diff] [blame] | 350 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 351 | .l3proto = PF_INET, |
| 352 | .name = "ipv4", |
| 353 | .pkt_to_tuple = ipv4_pkt_to_tuple, |
| 354 | .invert_tuple = ipv4_invert_tuple, |
| 355 | .print_tuple = ipv4_print_tuple, |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 356 | .get_l4proto = ipv4_get_l4proto, |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame] | 357 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 358 | .tuple_to_nlattr = ipv4_tuple_to_nlattr, |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 359 | .nlattr_tuple_size = ipv4_nlattr_tuple_size, |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 360 | .nlattr_to_tuple = ipv4_nlattr_to_tuple, |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 361 | .nla_policy = ipv4_nla_policy, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 362 | #endif |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 363 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 364 | .ctl_table_path = nf_net_ipv4_netfilter_sysctl_path, |
| 365 | .ctl_table = ip_ct_sysctl_table, |
| 366 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 367 | .me = THIS_MODULE, |
| 368 | }; |
| 369 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 370 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
| 371 | &nf_conntrack_htable_size, 0600); |
| 372 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 373 | MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); |
Patrick McHardy | d2483dd | 2006-12-02 22:06:05 -0800 | [diff] [blame] | 374 | MODULE_ALIAS("ip_conntrack"); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 375 | MODULE_LICENSE("GPL"); |
| 376 | |
| 377 | static int __init nf_conntrack_l3proto_ipv4_init(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 378 | { |
| 379 | int ret = 0; |
| 380 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 381 | need_conntrack(); |
KOVACS Krisztian | 73e4022 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 382 | nf_defrag_ipv4_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 383 | |
| 384 | ret = nf_register_sockopt(&so_getorigdst); |
| 385 | if (ret < 0) { |
| 386 | printk(KERN_ERR "Unable to register netfilter socket option\n"); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 387 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 388 | } |
| 389 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 390 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_tcp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 391 | if (ret < 0) { |
| 392 | printk("nf_conntrack_ipv4: can't register tcp.\n"); |
| 393 | goto cleanup_sockopt; |
| 394 | } |
| 395 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 396 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 397 | if (ret < 0) { |
| 398 | printk("nf_conntrack_ipv4: can't register udp.\n"); |
| 399 | goto cleanup_tcp; |
| 400 | } |
| 401 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 402 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_icmp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 403 | if (ret < 0) { |
| 404 | printk("nf_conntrack_ipv4: can't register icmp.\n"); |
| 405 | goto cleanup_udp; |
| 406 | } |
| 407 | |
| 408 | ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4); |
| 409 | if (ret < 0) { |
| 410 | printk("nf_conntrack_ipv4: can't register ipv4\n"); |
| 411 | goto cleanup_icmp; |
| 412 | } |
| 413 | |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 414 | ret = nf_register_hooks(ipv4_conntrack_ops, |
| 415 | ARRAY_SIZE(ipv4_conntrack_ops)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 416 | if (ret < 0) { |
Patrick McHardy | 964ddaa | 2006-04-06 14:09:49 -0700 | [diff] [blame] | 417 | printk("nf_conntrack_ipv4: can't register hooks.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 418 | goto cleanup_ipv4; |
| 419 | } |
Patrick McHardy | e4bd8bc | 2006-11-29 02:35:22 +0100 | [diff] [blame] | 420 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 421 | ret = nf_conntrack_ipv4_compat_init(); |
| 422 | if (ret < 0) |
| 423 | goto cleanup_hooks; |
| 424 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 425 | return ret; |
Patrick McHardy | e4bd8bc | 2006-11-29 02:35:22 +0100 | [diff] [blame] | 426 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 427 | cleanup_hooks: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 428 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
Patrick McHardy | e4bd8bc | 2006-11-29 02:35:22 +0100 | [diff] [blame] | 429 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 430 | cleanup_ipv4: |
| 431 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4); |
| 432 | cleanup_icmp: |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 433 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 434 | cleanup_udp: |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 435 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 436 | cleanup_tcp: |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 437 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 438 | cleanup_sockopt: |
| 439 | nf_unregister_sockopt(&so_getorigdst); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 440 | return ret; |
| 441 | } |
| 442 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 443 | static void __exit nf_conntrack_l3proto_ipv4_fini(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 444 | { |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 445 | synchronize_net(); |
Patrick McHardy | e4bd8bc | 2006-11-29 02:35:22 +0100 | [diff] [blame] | 446 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 447 | nf_conntrack_ipv4_compat_fini(); |
| 448 | #endif |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 449 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
| 450 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 451 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmp); |
| 452 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp4); |
| 453 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp4); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 454 | nf_unregister_sockopt(&so_getorigdst); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 455 | } |
| 456 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 457 | module_init(nf_conntrack_l3proto_ipv4_init); |
| 458 | module_exit(nf_conntrack_l3proto_ipv4_fini); |
Patrick McHardy | 591e620 | 2007-08-07 18:12:01 -0700 | [diff] [blame] | 459 | |
| 460 | void need_ipv4_conntrack(void) |
| 461 | { |
| 462 | return; |
| 463 | } |
| 464 | EXPORT_SYMBOL_GPL(need_ipv4_conntrack); |