Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1 | /* Connection tracking via netlink socket. Allows for user space |
| 2 | * protocol helpers and general trouble making from userspace. |
| 3 | * |
| 4 | * (C) 2001 by Jay Schulist <jschlst@samba.org> |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 5 | * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org> |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 6 | * (C) 2003 by Patrick Mchardy <kaber@trash.net> |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 7 | * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net> |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 8 | * |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 9 | * I've reworked this stuff to use attributes instead of conntrack |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 10 | * structures. 5.44 am. I need more tea. --pablo 05/07/11. |
| 11 | * |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 12 | * Initial connection tracking via netlink development funded and |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 13 | * generally made possible by Network Robots, Inc. (www.networkrobots.com) |
| 14 | * |
| 15 | * Further development of this code funded by Astaro AG (http://www.astaro.com) |
| 16 | * |
| 17 | * This software may be used and distributed according to the terms |
| 18 | * of the GNU General Public License, incorporated herein by reference. |
| 19 | * |
| 20 | * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14) |
| 21 | */ |
| 22 | |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/timer.h> |
| 28 | #include <linux/skbuff.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/netlink.h> |
| 31 | #include <linux/spinlock.h> |
Yasuyuki Kozakai | 40a839f | 2006-06-27 03:00:35 -0700 | [diff] [blame] | 32 | #include <linux/interrupt.h> |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 33 | #include <linux/notifier.h> |
| 34 | |
| 35 | #include <linux/netfilter.h> |
| 36 | #include <net/netfilter/nf_conntrack.h> |
| 37 | #include <net/netfilter/nf_conntrack_core.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 38 | #include <net/netfilter/nf_conntrack_expect.h> |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 39 | #include <net/netfilter/nf_conntrack_helper.h> |
| 40 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 41 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 42 | #include <net/netfilter/nf_conntrack_tuple.h> |
| 43 | #ifdef CONFIG_NF_NAT_NEEDED |
| 44 | #include <net/netfilter/nf_nat_core.h> |
| 45 | #include <net/netfilter/nf_nat_protocol.h> |
| 46 | #endif |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 47 | |
| 48 | #include <linux/netfilter/nfnetlink.h> |
| 49 | #include <linux/netfilter/nfnetlink_conntrack.h> |
| 50 | |
| 51 | MODULE_LICENSE("GPL"); |
| 52 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 53 | static char __initdata version[] = "0.93"; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 54 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 55 | static inline int |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 56 | ctnetlink_dump_tuples_proto(struct sk_buff *skb, |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 57 | const struct nf_conntrack_tuple *tuple, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 58 | struct nf_conntrack_l4proto *l4proto) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 59 | { |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 60 | int ret = 0; |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 61 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 62 | |
| 63 | NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum); |
| 64 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 65 | if (likely(l4proto->tuple_to_nfattr)) |
| 66 | ret = l4proto->tuple_to_nfattr(skb, tuple); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 67 | |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 68 | NFA_NEST_END(skb, nest_parms); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 69 | |
| 70 | return ret; |
| 71 | |
| 72 | nfattr_failure: |
| 73 | return -1; |
| 74 | } |
| 75 | |
| 76 | static inline int |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 77 | ctnetlink_dump_tuples_ip(struct sk_buff *skb, |
| 78 | const struct nf_conntrack_tuple *tuple, |
| 79 | struct nf_conntrack_l3proto *l3proto) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 80 | { |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 81 | int ret = 0; |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 82 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP); |
| 83 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 84 | if (likely(l3proto->tuple_to_nfattr)) |
| 85 | ret = l3proto->tuple_to_nfattr(skb, tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 86 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 87 | NFA_NEST_END(skb, nest_parms); |
| 88 | |
| 89 | return ret; |
| 90 | |
| 91 | nfattr_failure: |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | static inline int |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 96 | ctnetlink_dump_tuples(struct sk_buff *skb, |
| 97 | const struct nf_conntrack_tuple *tuple) |
| 98 | { |
| 99 | int ret; |
| 100 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 101 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 102 | |
| 103 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| 104 | ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto); |
| 105 | nf_ct_l3proto_put(l3proto); |
| 106 | |
| 107 | if (unlikely(ret < 0)) |
| 108 | return ret; |
| 109 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 110 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| 111 | ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto); |
| 112 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 113 | |
| 114 | return ret; |
| 115 | } |
| 116 | |
| 117 | static inline int |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 118 | ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) |
| 119 | { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 120 | __be32 status = htonl((u_int32_t) ct->status); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 121 | NFA_PUT(skb, CTA_STATUS, sizeof(status), &status); |
| 122 | return 0; |
| 123 | |
| 124 | nfattr_failure: |
| 125 | return -1; |
| 126 | } |
| 127 | |
| 128 | static inline int |
| 129 | ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct) |
| 130 | { |
| 131 | long timeout_l = ct->timeout.expires - jiffies; |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 132 | __be32 timeout; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 133 | |
| 134 | if (timeout_l < 0) |
| 135 | timeout = 0; |
| 136 | else |
| 137 | timeout = htonl(timeout_l / HZ); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 138 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 139 | NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout); |
| 140 | return 0; |
| 141 | |
| 142 | nfattr_failure: |
| 143 | return -1; |
| 144 | } |
| 145 | |
| 146 | static inline int |
| 147 | ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct) |
| 148 | { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 149 | struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 150 | struct nfattr *nest_proto; |
| 151 | int ret; |
| 152 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 153 | if (!l4proto->to_nfattr) { |
| 154 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 155 | return 0; |
| 156 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 157 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 158 | nest_proto = NFA_NEST(skb, CTA_PROTOINFO); |
| 159 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 160 | ret = l4proto->to_nfattr(skb, nest_proto, ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 161 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 162 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 163 | |
| 164 | NFA_NEST_END(skb, nest_proto); |
| 165 | |
| 166 | return ret; |
| 167 | |
| 168 | nfattr_failure: |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 169 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 170 | return -1; |
| 171 | } |
| 172 | |
| 173 | static inline int |
| 174 | ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct) |
| 175 | { |
| 176 | struct nfattr *nest_helper; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 177 | const struct nf_conn_help *help = nfct_help(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 178 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 179 | if (!help || !help->helper) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 180 | return 0; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 181 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 182 | nest_helper = NFA_NEST(skb, CTA_HELP); |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 183 | NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 184 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 185 | if (help->helper->to_nfattr) |
| 186 | help->helper->to_nfattr(skb, ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 187 | |
| 188 | NFA_NEST_END(skb, nest_helper); |
| 189 | |
| 190 | return 0; |
| 191 | |
| 192 | nfattr_failure: |
| 193 | return -1; |
| 194 | } |
| 195 | |
| 196 | #ifdef CONFIG_NF_CT_ACCT |
| 197 | static inline int |
| 198 | ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct, |
| 199 | enum ip_conntrack_dir dir) |
| 200 | { |
| 201 | enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG; |
| 202 | struct nfattr *nest_count = NFA_NEST(skb, type); |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 203 | __be32 tmp; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 204 | |
| 205 | tmp = htonl(ct->counters[dir].packets); |
| 206 | NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp); |
| 207 | |
| 208 | tmp = htonl(ct->counters[dir].bytes); |
| 209 | NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp); |
| 210 | |
| 211 | NFA_NEST_END(skb, nest_count); |
| 212 | |
| 213 | return 0; |
| 214 | |
| 215 | nfattr_failure: |
| 216 | return -1; |
| 217 | } |
| 218 | #else |
| 219 | #define ctnetlink_dump_counters(a, b, c) (0) |
| 220 | #endif |
| 221 | |
| 222 | #ifdef CONFIG_NF_CONNTRACK_MARK |
| 223 | static inline int |
| 224 | ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) |
| 225 | { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 226 | __be32 mark = htonl(ct->mark); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 227 | |
| 228 | NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark); |
| 229 | return 0; |
| 230 | |
| 231 | nfattr_failure: |
| 232 | return -1; |
| 233 | } |
| 234 | #else |
| 235 | #define ctnetlink_dump_mark(a, b) (0) |
| 236 | #endif |
| 237 | |
| 238 | static inline int |
| 239 | ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct) |
| 240 | { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 241 | __be32 id = htonl(ct->id); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 242 | NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id); |
| 243 | return 0; |
| 244 | |
| 245 | nfattr_failure: |
| 246 | return -1; |
| 247 | } |
| 248 | |
| 249 | static inline int |
| 250 | ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct) |
| 251 | { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 252 | __be32 use = htonl(atomic_read(&ct->ct_general.use)); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 253 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 254 | NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use); |
| 255 | return 0; |
| 256 | |
| 257 | nfattr_failure: |
| 258 | return -1; |
| 259 | } |
| 260 | |
| 261 | #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) |
| 262 | |
| 263 | static int |
| 264 | ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 265 | int event, int nowait, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 266 | const struct nf_conn *ct) |
| 267 | { |
| 268 | struct nlmsghdr *nlh; |
| 269 | struct nfgenmsg *nfmsg; |
| 270 | struct nfattr *nest_parms; |
| 271 | unsigned char *b; |
| 272 | |
| 273 | b = skb->tail; |
| 274 | |
| 275 | event |= NFNL_SUBSYS_CTNETLINK << 8; |
| 276 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); |
| 277 | nfmsg = NLMSG_DATA(nlh); |
| 278 | |
| 279 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 280 | nfmsg->nfgen_family = |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 281 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 282 | nfmsg->version = NFNETLINK_V0; |
| 283 | nfmsg->res_id = 0; |
| 284 | |
| 285 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); |
| 286 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
| 287 | goto nfattr_failure; |
| 288 | NFA_NEST_END(skb, nest_parms); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 289 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 290 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); |
| 291 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) |
| 292 | goto nfattr_failure; |
| 293 | NFA_NEST_END(skb, nest_parms); |
| 294 | |
| 295 | if (ctnetlink_dump_status(skb, ct) < 0 || |
| 296 | ctnetlink_dump_timeout(skb, ct) < 0 || |
| 297 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| 298 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 || |
| 299 | ctnetlink_dump_protoinfo(skb, ct) < 0 || |
| 300 | ctnetlink_dump_helpinfo(skb, ct) < 0 || |
| 301 | ctnetlink_dump_mark(skb, ct) < 0 || |
| 302 | ctnetlink_dump_id(skb, ct) < 0 || |
| 303 | ctnetlink_dump_use(skb, ct) < 0) |
| 304 | goto nfattr_failure; |
| 305 | |
| 306 | nlh->nlmsg_len = skb->tail - b; |
| 307 | return skb->len; |
| 308 | |
| 309 | nlmsg_failure: |
| 310 | nfattr_failure: |
| 311 | skb_trim(skb, b - skb->data); |
| 312 | return -1; |
| 313 | } |
| 314 | |
| 315 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 316 | static int ctnetlink_conntrack_event(struct notifier_block *this, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 317 | unsigned long events, void *ptr) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 318 | { |
| 319 | struct nlmsghdr *nlh; |
| 320 | struct nfgenmsg *nfmsg; |
| 321 | struct nfattr *nest_parms; |
| 322 | struct nf_conn *ct = (struct nf_conn *)ptr; |
| 323 | struct sk_buff *skb; |
| 324 | unsigned int type; |
| 325 | unsigned char *b; |
| 326 | unsigned int flags = 0, group; |
| 327 | |
| 328 | /* ignore our fake conntrack entry */ |
| 329 | if (ct == &nf_conntrack_untracked) |
| 330 | return NOTIFY_DONE; |
| 331 | |
| 332 | if (events & IPCT_DESTROY) { |
| 333 | type = IPCTNL_MSG_CT_DELETE; |
| 334 | group = NFNLGRP_CONNTRACK_DESTROY; |
| 335 | } else if (events & (IPCT_NEW | IPCT_RELATED)) { |
| 336 | type = IPCTNL_MSG_CT_NEW; |
| 337 | flags = NLM_F_CREATE|NLM_F_EXCL; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 338 | group = NFNLGRP_CONNTRACK_NEW; |
Pablo Neira Ayuso | 1a31526 | 2006-08-22 00:32:23 -0700 | [diff] [blame] | 339 | } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) { |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 340 | type = IPCTNL_MSG_CT_NEW; |
| 341 | group = NFNLGRP_CONNTRACK_UPDATE; |
| 342 | } else |
| 343 | return NOTIFY_DONE; |
Patrick McHardy | a242769 | 2006-03-20 18:03:59 -0800 | [diff] [blame] | 344 | |
| 345 | if (!nfnetlink_has_listeners(group)) |
| 346 | return NOTIFY_DONE; |
| 347 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 348 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 349 | if (!skb) |
| 350 | return NOTIFY_DONE; |
| 351 | |
| 352 | b = skb->tail; |
| 353 | |
| 354 | type |= NFNL_SUBSYS_CTNETLINK << 8; |
| 355 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
| 356 | nfmsg = NLMSG_DATA(nlh); |
| 357 | |
| 358 | nlh->nlmsg_flags = flags; |
| 359 | nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 360 | nfmsg->version = NFNETLINK_V0; |
| 361 | nfmsg->res_id = 0; |
| 362 | |
| 363 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); |
| 364 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
| 365 | goto nfattr_failure; |
| 366 | NFA_NEST_END(skb, nest_parms); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 367 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 368 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); |
| 369 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) |
| 370 | goto nfattr_failure; |
| 371 | NFA_NEST_END(skb, nest_parms); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 372 | |
Pablo Neira Ayuso | 7b621c1 | 2006-11-29 02:35:32 +0100 | [diff] [blame] | 373 | if (events & IPCT_DESTROY) { |
| 374 | if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| 375 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0) |
| 376 | goto nfattr_failure; |
| 377 | } else { |
| 378 | if (ctnetlink_dump_status(skb, ct) < 0) |
| 379 | goto nfattr_failure; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 380 | |
Pablo Neira Ayuso | 7b621c1 | 2006-11-29 02:35:32 +0100 | [diff] [blame] | 381 | if (ctnetlink_dump_timeout(skb, ct) < 0) |
| 382 | goto nfattr_failure; |
| 383 | |
| 384 | if (events & IPCT_PROTOINFO |
| 385 | && ctnetlink_dump_protoinfo(skb, ct) < 0) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 386 | goto nfattr_failure; |
Pablo Neira Ayuso | 7b621c1 | 2006-11-29 02:35:32 +0100 | [diff] [blame] | 387 | |
| 388 | if ((events & IPCT_HELPER || nfct_help(ct)) |
| 389 | && ctnetlink_dump_helpinfo(skb, ct) < 0) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 390 | goto nfattr_failure; |
Pablo Neira Ayuso | 7b621c1 | 2006-11-29 02:35:32 +0100 | [diff] [blame] | 391 | |
Patrick McHardy | 40e0cb0 | 2007-02-02 19:33:11 -0800 | [diff] [blame] | 392 | #ifdef CONFIG_NF_CONNTRACK_MARK |
Pablo Neira Ayuso | 7b621c1 | 2006-11-29 02:35:32 +0100 | [diff] [blame] | 393 | if ((events & IPCT_MARK || ct->mark) |
| 394 | && ctnetlink_dump_mark(skb, ct) < 0) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 395 | goto nfattr_failure; |
Patrick McHardy | 40e0cb0 | 2007-02-02 19:33:11 -0800 | [diff] [blame] | 396 | #endif |
Pablo Neira Ayuso | 7b621c1 | 2006-11-29 02:35:32 +0100 | [diff] [blame] | 397 | |
| 398 | if (events & IPCT_COUNTER_FILLING && |
| 399 | (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| 400 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)) |
| 401 | goto nfattr_failure; |
| 402 | } |
Pablo Neira Ayuso | b9a37e0 | 2006-08-22 00:31:49 -0700 | [diff] [blame] | 403 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 404 | nlh->nlmsg_len = skb->tail - b; |
| 405 | nfnetlink_send(skb, 0, group, 0); |
| 406 | return NOTIFY_DONE; |
| 407 | |
| 408 | nlmsg_failure: |
| 409 | nfattr_failure: |
| 410 | kfree_skb(skb); |
| 411 | return NOTIFY_DONE; |
| 412 | } |
| 413 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ |
| 414 | |
| 415 | static int ctnetlink_done(struct netlink_callback *cb) |
| 416 | { |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 417 | if (cb->args[1]) |
| 418 | nf_ct_put((struct nf_conn *)cb->args[1]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 419 | return 0; |
| 420 | } |
| 421 | |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 422 | #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num |
| 423 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 424 | static int |
| 425 | ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
| 426 | { |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 427 | struct nf_conn *ct, *last; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 428 | struct nf_conntrack_tuple_hash *h; |
| 429 | struct list_head *i; |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 430 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| 431 | u_int8_t l3proto = nfmsg->nfgen_family; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 432 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 433 | read_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | d205dc4 | 2006-08-17 18:12:38 -0700 | [diff] [blame] | 434 | last = (struct nf_conn *)cb->args[1]; |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 435 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) { |
| 436 | restart: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 437 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { |
| 438 | h = (struct nf_conntrack_tuple_hash *) i; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 439 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 440 | continue; |
| 441 | ct = nf_ct_tuplehash_to_ctrack(h); |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 442 | /* Dump entries of a given L3 protocol number. |
| 443 | * If it is not specified, ie. l3proto == 0, |
| 444 | * then dump everything. */ |
| 445 | if (l3proto && L3PROTO(ct) != l3proto) |
| 446 | continue; |
Patrick McHardy | d205dc4 | 2006-08-17 18:12:38 -0700 | [diff] [blame] | 447 | if (cb->args[1]) { |
| 448 | if (ct != last) |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 449 | continue; |
Patrick McHardy | d205dc4 | 2006-08-17 18:12:38 -0700 | [diff] [blame] | 450 | cb->args[1] = 0; |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 451 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 452 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 453 | cb->nlh->nlmsg_seq, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 454 | IPCTNL_MSG_CT_NEW, |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 455 | 1, ct) < 0) { |
| 456 | nf_conntrack_get(&ct->ct_general); |
| 457 | cb->args[1] = (unsigned long)ct; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 458 | goto out; |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 459 | } |
Pablo Neira Ayuso | 01f3484 | 2006-09-20 12:00:45 -0700 | [diff] [blame] | 460 | #ifdef CONFIG_NF_CT_ACCT |
| 461 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == |
| 462 | IPCTNL_MSG_CT_GET_CTRZERO) |
| 463 | memset(&ct->counters, 0, sizeof(ct->counters)); |
| 464 | #endif |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 465 | } |
Patrick McHardy | d205dc4 | 2006-08-17 18:12:38 -0700 | [diff] [blame] | 466 | if (cb->args[1]) { |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 467 | cb->args[1] = 0; |
| 468 | goto restart; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 469 | } |
| 470 | } |
Patrick McHardy | 89f2e21 | 2006-05-29 18:24:58 -0700 | [diff] [blame] | 471 | out: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 472 | read_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | d205dc4 | 2006-08-17 18:12:38 -0700 | [diff] [blame] | 473 | if (last) |
| 474 | nf_ct_put(last); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 475 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 476 | return skb->len; |
| 477 | } |
| 478 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 479 | static inline int |
| 480 | ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple) |
| 481 | { |
| 482 | struct nfattr *tb[CTA_IP_MAX]; |
| 483 | struct nf_conntrack_l3proto *l3proto; |
| 484 | int ret = 0; |
| 485 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 486 | nfattr_parse_nested(tb, CTA_IP_MAX, attr); |
| 487 | |
| 488 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| 489 | |
| 490 | if (likely(l3proto->nfattr_to_tuple)) |
| 491 | ret = l3proto->nfattr_to_tuple(tb, tuple); |
| 492 | |
| 493 | nf_ct_l3proto_put(l3proto); |
| 494 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 495 | return ret; |
| 496 | } |
| 497 | |
| 498 | static const size_t cta_min_proto[CTA_PROTO_MAX] = { |
| 499 | [CTA_PROTO_NUM-1] = sizeof(u_int8_t), |
| 500 | }; |
| 501 | |
| 502 | static inline int |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 503 | ctnetlink_parse_tuple_proto(struct nfattr *attr, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 504 | struct nf_conntrack_tuple *tuple) |
| 505 | { |
| 506 | struct nfattr *tb[CTA_PROTO_MAX]; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 507 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 508 | int ret = 0; |
| 509 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 510 | nfattr_parse_nested(tb, CTA_PROTO_MAX, attr); |
| 511 | |
| 512 | if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto)) |
| 513 | return -EINVAL; |
| 514 | |
| 515 | if (!tb[CTA_PROTO_NUM-1]) |
| 516 | return -EINVAL; |
| 517 | tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]); |
| 518 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 519 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 520 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 521 | if (likely(l4proto->nfattr_to_tuple)) |
| 522 | ret = l4proto->nfattr_to_tuple(tb, tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 523 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 524 | nf_ct_l4proto_put(l4proto); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 525 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 526 | return ret; |
| 527 | } |
| 528 | |
| 529 | static inline int |
| 530 | ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple, |
| 531 | enum ctattr_tuple type, u_int8_t l3num) |
| 532 | { |
| 533 | struct nfattr *tb[CTA_TUPLE_MAX]; |
| 534 | int err; |
| 535 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 536 | memset(tuple, 0, sizeof(*tuple)); |
| 537 | |
| 538 | nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]); |
| 539 | |
| 540 | if (!tb[CTA_TUPLE_IP-1]) |
| 541 | return -EINVAL; |
| 542 | |
| 543 | tuple->src.l3num = l3num; |
| 544 | |
| 545 | err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple); |
| 546 | if (err < 0) |
| 547 | return err; |
| 548 | |
| 549 | if (!tb[CTA_TUPLE_PROTO-1]) |
| 550 | return -EINVAL; |
| 551 | |
| 552 | err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple); |
| 553 | if (err < 0) |
| 554 | return err; |
| 555 | |
| 556 | /* orig and expect tuples get DIR_ORIGINAL */ |
| 557 | if (type == CTA_TUPLE_REPLY) |
| 558 | tuple->dst.dir = IP_CT_DIR_REPLY; |
| 559 | else |
| 560 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 561 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 562 | return 0; |
| 563 | } |
| 564 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 565 | #ifdef CONFIG_NF_NAT_NEEDED |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 566 | static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = { |
| 567 | [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t), |
| 568 | [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t), |
| 569 | }; |
| 570 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 571 | static int nfnetlink_parse_nat_proto(struct nfattr *attr, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 572 | const struct nf_conn *ct, |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 573 | struct nf_nat_range *range) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 574 | { |
| 575 | struct nfattr *tb[CTA_PROTONAT_MAX]; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 576 | struct nf_nat_protocol *npt; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 577 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 578 | nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr); |
| 579 | |
| 580 | if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat)) |
| 581 | return -EINVAL; |
| 582 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 583 | npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 584 | |
| 585 | if (!npt->nfattr_to_range) { |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 586 | nf_nat_proto_put(npt); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */ |
| 591 | if (npt->nfattr_to_range(tb, range) > 0) |
| 592 | range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED; |
| 593 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 594 | nf_nat_proto_put(npt); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 595 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 596 | return 0; |
| 597 | } |
| 598 | |
| 599 | static const size_t cta_min_nat[CTA_NAT_MAX] = { |
| 600 | [CTA_NAT_MINIP-1] = sizeof(u_int32_t), |
| 601 | [CTA_NAT_MAXIP-1] = sizeof(u_int32_t), |
| 602 | }; |
| 603 | |
| 604 | static inline int |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 605 | nfnetlink_parse_nat(struct nfattr *nat, |
| 606 | const struct nf_conn *ct, struct nf_nat_range *range) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 607 | { |
| 608 | struct nfattr *tb[CTA_NAT_MAX]; |
| 609 | int err; |
| 610 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 611 | memset(range, 0, sizeof(*range)); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 612 | |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 613 | nfattr_parse_nested(tb, CTA_NAT_MAX, nat); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 614 | |
| 615 | if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat)) |
| 616 | return -EINVAL; |
| 617 | |
| 618 | if (tb[CTA_NAT_MINIP-1]) |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 619 | range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 620 | |
| 621 | if (!tb[CTA_NAT_MAXIP-1]) |
| 622 | range->max_ip = range->min_ip; |
| 623 | else |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 624 | range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 625 | |
| 626 | if (range->min_ip) |
| 627 | range->flags |= IP_NAT_RANGE_MAP_IPS; |
| 628 | |
| 629 | if (!tb[CTA_NAT_PROTO-1]) |
| 630 | return 0; |
| 631 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 632 | err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 633 | if (err < 0) |
| 634 | return err; |
| 635 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 636 | return 0; |
| 637 | } |
| 638 | #endif |
| 639 | |
| 640 | static inline int |
| 641 | ctnetlink_parse_help(struct nfattr *attr, char **helper_name) |
| 642 | { |
| 643 | struct nfattr *tb[CTA_HELP_MAX]; |
| 644 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 645 | nfattr_parse_nested(tb, CTA_HELP_MAX, attr); |
| 646 | |
| 647 | if (!tb[CTA_HELP_NAME-1]) |
| 648 | return -EINVAL; |
| 649 | |
| 650 | *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]); |
| 651 | |
| 652 | return 0; |
| 653 | } |
| 654 | |
| 655 | static const size_t cta_min[CTA_MAX] = { |
| 656 | [CTA_STATUS-1] = sizeof(u_int32_t), |
| 657 | [CTA_TIMEOUT-1] = sizeof(u_int32_t), |
| 658 | [CTA_MARK-1] = sizeof(u_int32_t), |
| 659 | [CTA_USE-1] = sizeof(u_int32_t), |
| 660 | [CTA_ID-1] = sizeof(u_int32_t) |
| 661 | }; |
| 662 | |
| 663 | static int |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 664 | ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 665 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 666 | { |
| 667 | struct nf_conntrack_tuple_hash *h; |
| 668 | struct nf_conntrack_tuple tuple; |
| 669 | struct nf_conn *ct; |
| 670 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 671 | u_int8_t u3 = nfmsg->nfgen_family; |
| 672 | int err = 0; |
| 673 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 674 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 675 | return -EINVAL; |
| 676 | |
| 677 | if (cda[CTA_TUPLE_ORIG-1]) |
| 678 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
| 679 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 680 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
| 681 | else { |
| 682 | /* Flush the whole table */ |
| 683 | nf_conntrack_flush(); |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | if (err < 0) |
| 688 | return err; |
| 689 | |
| 690 | h = nf_conntrack_find_get(&tuple, NULL); |
Pablo Neira Ayuso | 9ea8cfd | 2006-10-12 14:09:16 -0700 | [diff] [blame] | 691 | if (!h) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 692 | return -ENOENT; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 693 | |
| 694 | ct = nf_ct_tuplehash_to_ctrack(h); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 695 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 696 | if (cda[CTA_ID-1]) { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 697 | u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1])); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 698 | if (ct->id != id) { |
| 699 | nf_ct_put(ct); |
| 700 | return -ENOENT; |
| 701 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 702 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 703 | if (del_timer(&ct->timeout)) |
| 704 | ct->timeout.function((unsigned long)ct); |
| 705 | |
| 706 | nf_ct_put(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 707 | |
| 708 | return 0; |
| 709 | } |
| 710 | |
| 711 | static int |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 712 | ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 713 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 714 | { |
| 715 | struct nf_conntrack_tuple_hash *h; |
| 716 | struct nf_conntrack_tuple tuple; |
| 717 | struct nf_conn *ct; |
| 718 | struct sk_buff *skb2 = NULL; |
| 719 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 720 | u_int8_t u3 = nfmsg->nfgen_family; |
| 721 | int err = 0; |
| 722 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 723 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 724 | u32 rlen; |
| 725 | |
Pablo Neira Ayuso | 01f3484 | 2006-09-20 12:00:45 -0700 | [diff] [blame] | 726 | #ifndef CONFIG_NF_CT_ACCT |
| 727 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 728 | return -ENOTSUPP; |
| 729 | #endif |
Pablo Neira Ayuso | 01f3484 | 2006-09-20 12:00:45 -0700 | [diff] [blame] | 730 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
| 731 | ctnetlink_dump_table, |
| 732 | ctnetlink_done)) != 0) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 733 | return -EINVAL; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 734 | |
| 735 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| 736 | if (rlen > skb->len) |
| 737 | rlen = skb->len; |
| 738 | skb_pull(skb, rlen); |
| 739 | return 0; |
| 740 | } |
| 741 | |
| 742 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 743 | return -EINVAL; |
| 744 | |
| 745 | if (cda[CTA_TUPLE_ORIG-1]) |
| 746 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
| 747 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 748 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
| 749 | else |
| 750 | return -EINVAL; |
| 751 | |
| 752 | if (err < 0) |
| 753 | return err; |
| 754 | |
| 755 | h = nf_conntrack_find_get(&tuple, NULL); |
Pablo Neira Ayuso | 9ea8cfd | 2006-10-12 14:09:16 -0700 | [diff] [blame] | 756 | if (!h) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 757 | return -ENOENT; |
Pablo Neira Ayuso | 9ea8cfd | 2006-10-12 14:09:16 -0700 | [diff] [blame] | 758 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 759 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 760 | |
| 761 | err = -ENOMEM; |
| 762 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 763 | if (!skb2) { |
| 764 | nf_ct_put(ct); |
| 765 | return -ENOMEM; |
| 766 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 767 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 768 | err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 769 | IPCTNL_MSG_CT_NEW, 1, ct); |
| 770 | nf_ct_put(ct); |
| 771 | if (err <= 0) |
| 772 | goto free; |
| 773 | |
| 774 | err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 775 | if (err < 0) |
| 776 | goto out; |
| 777 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 778 | return 0; |
| 779 | |
| 780 | free: |
| 781 | kfree_skb(skb2); |
| 782 | out: |
| 783 | return err; |
| 784 | } |
| 785 | |
| 786 | static inline int |
| 787 | ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[]) |
| 788 | { |
| 789 | unsigned long d; |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 790 | unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1])); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 791 | d = ct->status ^ status; |
| 792 | |
| 793 | if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING)) |
| 794 | /* unchangeable */ |
| 795 | return -EINVAL; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 796 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 797 | if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY)) |
| 798 | /* SEEN_REPLY bit can only be set */ |
| 799 | return -EINVAL; |
| 800 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 801 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 802 | if (d & IPS_ASSURED && !(status & IPS_ASSURED)) |
| 803 | /* ASSURED bit can only be set */ |
| 804 | return -EINVAL; |
| 805 | |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 806 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 807 | #ifndef CONFIG_NF_NAT_NEEDED |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 808 | return -EINVAL; |
| 809 | #else |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 810 | struct nf_nat_range range; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 811 | |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 812 | if (cda[CTA_NAT_DST-1]) { |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 813 | if (nfnetlink_parse_nat(cda[CTA_NAT_DST-1], ct, |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 814 | &range) < 0) |
| 815 | return -EINVAL; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 816 | if (nf_nat_initialized(ct, |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 817 | HOOK2MANIP(NF_IP_PRE_ROUTING))) |
| 818 | return -EEXIST; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 819 | nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING); |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 820 | } |
| 821 | if (cda[CTA_NAT_SRC-1]) { |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 822 | if (nfnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct, |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 823 | &range) < 0) |
| 824 | return -EINVAL; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 825 | if (nf_nat_initialized(ct, |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 826 | HOOK2MANIP(NF_IP_POST_ROUTING))) |
| 827 | return -EEXIST; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 828 | nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING); |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 829 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 830 | #endif |
| 831 | } |
| 832 | |
| 833 | /* Be careful here, modifying NAT bits can screw up things, |
| 834 | * so don't let users modify them directly if they don't pass |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 835 | * nf_nat_range. */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 836 | ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK); |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | |
| 841 | static inline int |
| 842 | ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[]) |
| 843 | { |
| 844 | struct nf_conntrack_helper *helper; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 845 | struct nf_conn_help *help = nfct_help(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 846 | char *helpname; |
| 847 | int err; |
| 848 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 849 | if (!help) { |
| 850 | /* FIXME: we need to reallocate and rehash */ |
| 851 | return -EBUSY; |
| 852 | } |
| 853 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 854 | /* don't change helper of sibling connections */ |
| 855 | if (ct->master) |
| 856 | return -EINVAL; |
| 857 | |
| 858 | err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname); |
| 859 | if (err < 0) |
| 860 | return err; |
| 861 | |
| 862 | helper = __nf_conntrack_helper_find_byname(helpname); |
| 863 | if (!helper) { |
| 864 | if (!strcmp(helpname, "")) |
| 865 | helper = NULL; |
| 866 | else |
| 867 | return -EINVAL; |
| 868 | } |
| 869 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 870 | if (help->helper) { |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 871 | if (!helper) { |
| 872 | /* we had a helper before ... */ |
| 873 | nf_ct_remove_expectations(ct); |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 874 | help->helper = NULL; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 875 | } else { |
| 876 | /* need to zero data of old helper */ |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 877 | memset(&help->help, 0, sizeof(help->help)); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 878 | } |
| 879 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 880 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 881 | help->helper = helper; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 882 | |
| 883 | return 0; |
| 884 | } |
| 885 | |
| 886 | static inline int |
| 887 | ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[]) |
| 888 | { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 889 | u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 890 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 891 | if (!del_timer(&ct->timeout)) |
| 892 | return -ETIME; |
| 893 | |
| 894 | ct->timeout.expires = jiffies + timeout * HZ; |
| 895 | add_timer(&ct->timeout); |
| 896 | |
| 897 | return 0; |
| 898 | } |
| 899 | |
| 900 | static inline int |
| 901 | ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[]) |
| 902 | { |
| 903 | struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1]; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 904 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 905 | u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; |
| 906 | u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 907 | int err = 0; |
| 908 | |
| 909 | nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr); |
| 910 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 911 | l4proto = nf_ct_l4proto_find_get(l3num, npt); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 912 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 913 | if (l4proto->from_nfattr) |
| 914 | err = l4proto->from_nfattr(tb, ct); |
| 915 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 916 | |
| 917 | return err; |
| 918 | } |
| 919 | |
| 920 | static int |
| 921 | ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[]) |
| 922 | { |
| 923 | int err; |
| 924 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 925 | if (cda[CTA_HELP-1]) { |
| 926 | err = ctnetlink_change_helper(ct, cda); |
| 927 | if (err < 0) |
| 928 | return err; |
| 929 | } |
| 930 | |
| 931 | if (cda[CTA_TIMEOUT-1]) { |
| 932 | err = ctnetlink_change_timeout(ct, cda); |
| 933 | if (err < 0) |
| 934 | return err; |
| 935 | } |
| 936 | |
| 937 | if (cda[CTA_STATUS-1]) { |
| 938 | err = ctnetlink_change_status(ct, cda); |
| 939 | if (err < 0) |
| 940 | return err; |
| 941 | } |
| 942 | |
| 943 | if (cda[CTA_PROTOINFO-1]) { |
| 944 | err = ctnetlink_change_protoinfo(ct, cda); |
| 945 | if (err < 0) |
| 946 | return err; |
| 947 | } |
| 948 | |
Martin Josefsson | bcd1e83 | 2006-04-01 02:23:21 -0800 | [diff] [blame] | 949 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 950 | if (cda[CTA_MARK-1]) |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 951 | ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1])); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 952 | #endif |
| 953 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 954 | return 0; |
| 955 | } |
| 956 | |
| 957 | static int |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 958 | ctnetlink_create_conntrack(struct nfattr *cda[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 959 | struct nf_conntrack_tuple *otuple, |
| 960 | struct nf_conntrack_tuple *rtuple) |
| 961 | { |
| 962 | struct nf_conn *ct; |
| 963 | int err = -EINVAL; |
Yasuyuki Kozakai | dafc741 | 2006-11-27 10:25:32 -0800 | [diff] [blame] | 964 | struct nf_conn_help *help; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 965 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 966 | ct = nf_conntrack_alloc(otuple, rtuple); |
| 967 | if (ct == NULL || IS_ERR(ct)) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 968 | return -ENOMEM; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 969 | |
| 970 | if (!cda[CTA_TIMEOUT-1]) |
| 971 | goto err; |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 972 | ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 973 | |
| 974 | ct->timeout.expires = jiffies + ct->timeout.expires * HZ; |
| 975 | ct->status |= IPS_CONFIRMED; |
| 976 | |
Pablo Neira Ayuso | bbb3357 | 2006-11-29 02:35:31 +0100 | [diff] [blame] | 977 | if (cda[CTA_STATUS-1]) { |
| 978 | err = ctnetlink_change_status(ct, cda); |
| 979 | if (err < 0) |
| 980 | goto err; |
| 981 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 982 | |
| 983 | if (cda[CTA_PROTOINFO-1]) { |
| 984 | err = ctnetlink_change_protoinfo(ct, cda); |
| 985 | if (err < 0) |
Patrick McHardy | c54ea3b | 2007-01-15 17:16:03 -0800 | [diff] [blame] | 986 | goto err; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 987 | } |
| 988 | |
Martin Josefsson | bcd1e83 | 2006-04-01 02:23:21 -0800 | [diff] [blame] | 989 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 990 | if (cda[CTA_MARK-1]) |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 991 | ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1])); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 992 | #endif |
| 993 | |
Yasuyuki Kozakai | dafc741 | 2006-11-27 10:25:32 -0800 | [diff] [blame] | 994 | help = nfct_help(ct); |
| 995 | if (help) |
| 996 | help->helper = nf_ct_helper_find_get(rtuple); |
| 997 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 998 | add_timer(&ct->timeout); |
| 999 | nf_conntrack_hash_insert(ct); |
| 1000 | |
Yasuyuki Kozakai | dafc741 | 2006-11-27 10:25:32 -0800 | [diff] [blame] | 1001 | if (help && help->helper) |
| 1002 | nf_ct_helper_put(help->helper); |
| 1003 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1004 | return 0; |
| 1005 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1006 | err: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1007 | nf_conntrack_free(ct); |
| 1008 | return err; |
| 1009 | } |
| 1010 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1011 | static int |
| 1012 | ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1013 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1014 | { |
| 1015 | struct nf_conntrack_tuple otuple, rtuple; |
| 1016 | struct nf_conntrack_tuple_hash *h = NULL; |
| 1017 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1018 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1019 | int err = 0; |
| 1020 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1021 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 1022 | return -EINVAL; |
| 1023 | |
| 1024 | if (cda[CTA_TUPLE_ORIG-1]) { |
| 1025 | err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3); |
| 1026 | if (err < 0) |
| 1027 | return err; |
| 1028 | } |
| 1029 | |
| 1030 | if (cda[CTA_TUPLE_REPLY-1]) { |
| 1031 | err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3); |
| 1032 | if (err < 0) |
| 1033 | return err; |
| 1034 | } |
| 1035 | |
| 1036 | write_lock_bh(&nf_conntrack_lock); |
| 1037 | if (cda[CTA_TUPLE_ORIG-1]) |
| 1038 | h = __nf_conntrack_find(&otuple, NULL); |
| 1039 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 1040 | h = __nf_conntrack_find(&rtuple, NULL); |
| 1041 | |
| 1042 | if (h == NULL) { |
| 1043 | write_unlock_bh(&nf_conntrack_lock); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1044 | err = -ENOENT; |
| 1045 | if (nlh->nlmsg_flags & NLM_F_CREATE) |
| 1046 | err = ctnetlink_create_conntrack(cda, &otuple, &rtuple); |
| 1047 | return err; |
| 1048 | } |
| 1049 | /* implicit 'else' */ |
| 1050 | |
| 1051 | /* we only allow nat config for new conntracks */ |
Patrick McHardy | 3726add | 2006-05-29 18:24:39 -0700 | [diff] [blame] | 1052 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1053 | err = -EINVAL; |
| 1054 | goto out_unlock; |
| 1055 | } |
| 1056 | |
| 1057 | /* We manipulate the conntrack inside the global conntrack table lock, |
| 1058 | * so there's no need to increase the refcount */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1059 | err = -EEXIST; |
| 1060 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) |
| 1061 | err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda); |
| 1062 | |
| 1063 | out_unlock: |
| 1064 | write_unlock_bh(&nf_conntrack_lock); |
| 1065 | return err; |
| 1066 | } |
| 1067 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1068 | /*********************************************************************** |
| 1069 | * EXPECT |
| 1070 | ***********************************************************************/ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1071 | |
| 1072 | static inline int |
| 1073 | ctnetlink_exp_dump_tuple(struct sk_buff *skb, |
| 1074 | const struct nf_conntrack_tuple *tuple, |
| 1075 | enum ctattr_expect type) |
| 1076 | { |
| 1077 | struct nfattr *nest_parms = NFA_NEST(skb, type); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1078 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1079 | if (ctnetlink_dump_tuples(skb, tuple) < 0) |
| 1080 | goto nfattr_failure; |
| 1081 | |
| 1082 | NFA_NEST_END(skb, nest_parms); |
| 1083 | |
| 1084 | return 0; |
| 1085 | |
| 1086 | nfattr_failure: |
| 1087 | return -1; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1088 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1089 | |
| 1090 | static inline int |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 1091 | ctnetlink_exp_dump_mask(struct sk_buff *skb, |
| 1092 | const struct nf_conntrack_tuple *tuple, |
| 1093 | const struct nf_conntrack_tuple *mask) |
| 1094 | { |
| 1095 | int ret; |
| 1096 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1097 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 1098 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK); |
| 1099 | |
| 1100 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| 1101 | ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto); |
| 1102 | nf_ct_l3proto_put(l3proto); |
| 1103 | |
| 1104 | if (unlikely(ret < 0)) |
| 1105 | goto nfattr_failure; |
| 1106 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1107 | l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| 1108 | ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto); |
| 1109 | nf_ct_l4proto_put(l4proto); |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 1110 | if (unlikely(ret < 0)) |
| 1111 | goto nfattr_failure; |
| 1112 | |
| 1113 | NFA_NEST_END(skb, nest_parms); |
| 1114 | |
| 1115 | return 0; |
| 1116 | |
| 1117 | nfattr_failure: |
| 1118 | return -1; |
| 1119 | } |
| 1120 | |
| 1121 | static inline int |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1122 | ctnetlink_exp_dump_expect(struct sk_buff *skb, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1123 | const struct nf_conntrack_expect *exp) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1124 | { |
| 1125 | struct nf_conn *master = exp->master; |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 1126 | __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ); |
| 1127 | __be32 id = htonl(exp->id); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1128 | |
| 1129 | if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0) |
| 1130 | goto nfattr_failure; |
Pablo Neira Ayuso | 1cde643 | 2006-03-22 13:54:15 -0800 | [diff] [blame] | 1131 | if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1132 | goto nfattr_failure; |
| 1133 | if (ctnetlink_exp_dump_tuple(skb, |
| 1134 | &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 1135 | CTA_EXPECT_MASTER) < 0) |
| 1136 | goto nfattr_failure; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1137 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1138 | NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout); |
| 1139 | NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id); |
| 1140 | |
| 1141 | return 0; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1142 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1143 | nfattr_failure: |
| 1144 | return -1; |
| 1145 | } |
| 1146 | |
| 1147 | static int |
| 1148 | ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1149 | int event, |
| 1150 | int nowait, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1151 | const struct nf_conntrack_expect *exp) |
| 1152 | { |
| 1153 | struct nlmsghdr *nlh; |
| 1154 | struct nfgenmsg *nfmsg; |
| 1155 | unsigned char *b; |
| 1156 | |
| 1157 | b = skb->tail; |
| 1158 | |
| 1159 | event |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
| 1160 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); |
| 1161 | nfmsg = NLMSG_DATA(nlh); |
| 1162 | |
| 1163 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; |
| 1164 | nfmsg->nfgen_family = exp->tuple.src.l3num; |
| 1165 | nfmsg->version = NFNETLINK_V0; |
| 1166 | nfmsg->res_id = 0; |
| 1167 | |
| 1168 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
| 1169 | goto nfattr_failure; |
| 1170 | |
| 1171 | nlh->nlmsg_len = skb->tail - b; |
| 1172 | return skb->len; |
| 1173 | |
| 1174 | nlmsg_failure: |
| 1175 | nfattr_failure: |
| 1176 | skb_trim(skb, b - skb->data); |
| 1177 | return -1; |
| 1178 | } |
| 1179 | |
| 1180 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1181 | static int ctnetlink_expect_event(struct notifier_block *this, |
| 1182 | unsigned long events, void *ptr) |
| 1183 | { |
| 1184 | struct nlmsghdr *nlh; |
| 1185 | struct nfgenmsg *nfmsg; |
| 1186 | struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr; |
| 1187 | struct sk_buff *skb; |
| 1188 | unsigned int type; |
| 1189 | unsigned char *b; |
| 1190 | int flags = 0; |
| 1191 | |
| 1192 | if (events & IPEXP_NEW) { |
| 1193 | type = IPCTNL_MSG_EXP_NEW; |
| 1194 | flags = NLM_F_CREATE|NLM_F_EXCL; |
| 1195 | } else |
| 1196 | return NOTIFY_DONE; |
| 1197 | |
Pablo Neira Ayuso | b3a27bf | 2006-08-22 00:32:05 -0700 | [diff] [blame] | 1198 | if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW)) |
| 1199 | return NOTIFY_DONE; |
| 1200 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1201 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 1202 | if (!skb) |
| 1203 | return NOTIFY_DONE; |
| 1204 | |
| 1205 | b = skb->tail; |
| 1206 | |
Marcus Sundberg | b633ad5 | 2006-02-04 02:11:09 -0800 | [diff] [blame] | 1207 | type |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1208 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
| 1209 | nfmsg = NLMSG_DATA(nlh); |
| 1210 | |
| 1211 | nlh->nlmsg_flags = flags; |
| 1212 | nfmsg->nfgen_family = exp->tuple.src.l3num; |
| 1213 | nfmsg->version = NFNETLINK_V0; |
| 1214 | nfmsg->res_id = 0; |
| 1215 | |
| 1216 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
| 1217 | goto nfattr_failure; |
| 1218 | |
| 1219 | nlh->nlmsg_len = skb->tail - b; |
| 1220 | nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0); |
| 1221 | return NOTIFY_DONE; |
| 1222 | |
| 1223 | nlmsg_failure: |
| 1224 | nfattr_failure: |
| 1225 | kfree_skb(skb); |
| 1226 | return NOTIFY_DONE; |
| 1227 | } |
| 1228 | #endif |
| 1229 | |
| 1230 | static int |
| 1231 | ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
| 1232 | { |
| 1233 | struct nf_conntrack_expect *exp = NULL; |
| 1234 | struct list_head *i; |
| 1235 | u_int32_t *id = (u_int32_t *) &cb->args[0]; |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 1236 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| 1237 | u_int8_t l3proto = nfmsg->nfgen_family; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1238 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1239 | read_lock_bh(&nf_conntrack_lock); |
| 1240 | list_for_each_prev(i, &nf_conntrack_expect_list) { |
| 1241 | exp = (struct nf_conntrack_expect *) i; |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 1242 | if (l3proto && exp->tuple.src.l3num != l3proto) |
| 1243 | continue; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1244 | if (exp->id <= *id) |
| 1245 | continue; |
| 1246 | if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| 1247 | cb->nlh->nlmsg_seq, |
| 1248 | IPCTNL_MSG_EXP_NEW, |
| 1249 | 1, exp) < 0) |
| 1250 | goto out; |
| 1251 | *id = exp->id; |
| 1252 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1253 | out: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1254 | read_unlock_bh(&nf_conntrack_lock); |
| 1255 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1256 | return skb->len; |
| 1257 | } |
| 1258 | |
| 1259 | static const size_t cta_min_exp[CTA_EXPECT_MAX] = { |
| 1260 | [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t), |
| 1261 | [CTA_EXPECT_ID-1] = sizeof(u_int32_t) |
| 1262 | }; |
| 1263 | |
| 1264 | static int |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1265 | ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1266 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1267 | { |
| 1268 | struct nf_conntrack_tuple tuple; |
| 1269 | struct nf_conntrack_expect *exp; |
| 1270 | struct sk_buff *skb2; |
| 1271 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1272 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1273 | int err = 0; |
| 1274 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1275 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1276 | return -EINVAL; |
| 1277 | |
| 1278 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1279 | u32 rlen; |
| 1280 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1281 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1282 | ctnetlink_exp_dump_table, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1283 | ctnetlink_done)) != 0) |
| 1284 | return -EINVAL; |
| 1285 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| 1286 | if (rlen > skb->len) |
| 1287 | rlen = skb->len; |
| 1288 | skb_pull(skb, rlen); |
| 1289 | return 0; |
| 1290 | } |
| 1291 | |
| 1292 | if (cda[CTA_EXPECT_MASTER-1]) |
| 1293 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3); |
| 1294 | else |
| 1295 | return -EINVAL; |
| 1296 | |
| 1297 | if (err < 0) |
| 1298 | return err; |
| 1299 | |
Yasuyuki Kozakai | 468ec44 | 2006-11-29 02:35:23 +0100 | [diff] [blame] | 1300 | exp = nf_conntrack_expect_find_get(&tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1301 | if (!exp) |
| 1302 | return -ENOENT; |
| 1303 | |
| 1304 | if (cda[CTA_EXPECT_ID-1]) { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 1305 | __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1306 | if (exp->id != ntohl(id)) { |
| 1307 | nf_conntrack_expect_put(exp); |
| 1308 | return -ENOENT; |
| 1309 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1310 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1311 | |
| 1312 | err = -ENOMEM; |
| 1313 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1314 | if (!skb2) |
| 1315 | goto out; |
Thomas Graf | 4e9b826 | 2006-11-27 09:25:58 -0800 | [diff] [blame] | 1316 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1317 | err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1318 | nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, |
| 1319 | 1, exp); |
| 1320 | if (err <= 0) |
| 1321 | goto free; |
| 1322 | |
| 1323 | nf_conntrack_expect_put(exp); |
| 1324 | |
| 1325 | return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 1326 | |
| 1327 | free: |
| 1328 | kfree_skb(skb2); |
| 1329 | out: |
| 1330 | nf_conntrack_expect_put(exp); |
| 1331 | return err; |
| 1332 | } |
| 1333 | |
| 1334 | static int |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1335 | ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1336 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1337 | { |
| 1338 | struct nf_conntrack_expect *exp, *tmp; |
| 1339 | struct nf_conntrack_tuple tuple; |
| 1340 | struct nf_conntrack_helper *h; |
| 1341 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1342 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1343 | int err; |
| 1344 | |
| 1345 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1346 | return -EINVAL; |
| 1347 | |
| 1348 | if (cda[CTA_EXPECT_TUPLE-1]) { |
| 1349 | /* delete a single expect by tuple */ |
| 1350 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1351 | if (err < 0) |
| 1352 | return err; |
| 1353 | |
| 1354 | /* bump usage count to 2 */ |
Yasuyuki Kozakai | 468ec44 | 2006-11-29 02:35:23 +0100 | [diff] [blame] | 1355 | exp = nf_conntrack_expect_find_get(&tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1356 | if (!exp) |
| 1357 | return -ENOENT; |
| 1358 | |
| 1359 | if (cda[CTA_EXPECT_ID-1]) { |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 1360 | __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1361 | if (exp->id != ntohl(id)) { |
| 1362 | nf_conntrack_expect_put(exp); |
| 1363 | return -ENOENT; |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | /* after list removal, usage count == 1 */ |
| 1368 | nf_conntrack_unexpect_related(exp); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1369 | /* have to put what we 'get' above. |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1370 | * after this line usage count == 0 */ |
| 1371 | nf_conntrack_expect_put(exp); |
| 1372 | } else if (cda[CTA_EXPECT_HELP_NAME-1]) { |
| 1373 | char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]); |
| 1374 | |
| 1375 | /* delete all expectations for this helper */ |
| 1376 | write_lock_bh(&nf_conntrack_lock); |
| 1377 | h = __nf_conntrack_helper_find_byname(name); |
| 1378 | if (!h) { |
| 1379 | write_unlock_bh(&nf_conntrack_lock); |
| 1380 | return -EINVAL; |
| 1381 | } |
| 1382 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, |
| 1383 | list) { |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 1384 | struct nf_conn_help *m_help = nfct_help(exp->master); |
| 1385 | if (m_help->helper == h |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1386 | && del_timer(&exp->timeout)) { |
| 1387 | nf_ct_unlink_expect(exp); |
| 1388 | nf_conntrack_expect_put(exp); |
| 1389 | } |
| 1390 | } |
| 1391 | write_unlock_bh(&nf_conntrack_lock); |
| 1392 | } else { |
| 1393 | /* This basically means we have to flush everything*/ |
| 1394 | write_lock_bh(&nf_conntrack_lock); |
| 1395 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, |
| 1396 | list) { |
| 1397 | if (del_timer(&exp->timeout)) { |
| 1398 | nf_ct_unlink_expect(exp); |
| 1399 | nf_conntrack_expect_put(exp); |
| 1400 | } |
| 1401 | } |
| 1402 | write_unlock_bh(&nf_conntrack_lock); |
| 1403 | } |
| 1404 | |
| 1405 | return 0; |
| 1406 | } |
| 1407 | static int |
| 1408 | ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[]) |
| 1409 | { |
| 1410 | return -EOPNOTSUPP; |
| 1411 | } |
| 1412 | |
| 1413 | static int |
| 1414 | ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3) |
| 1415 | { |
| 1416 | struct nf_conntrack_tuple tuple, mask, master_tuple; |
| 1417 | struct nf_conntrack_tuple_hash *h = NULL; |
| 1418 | struct nf_conntrack_expect *exp; |
| 1419 | struct nf_conn *ct; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 1420 | struct nf_conn_help *help; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1421 | int err = 0; |
| 1422 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1423 | /* caller guarantees that those three CTA_EXPECT_* exist */ |
| 1424 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1425 | if (err < 0) |
| 1426 | return err; |
| 1427 | err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3); |
| 1428 | if (err < 0) |
| 1429 | return err; |
| 1430 | err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3); |
| 1431 | if (err < 0) |
| 1432 | return err; |
| 1433 | |
| 1434 | /* Look for master conntrack of this expectation */ |
| 1435 | h = nf_conntrack_find_get(&master_tuple, NULL); |
| 1436 | if (!h) |
| 1437 | return -ENOENT; |
| 1438 | ct = nf_ct_tuplehash_to_ctrack(h); |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 1439 | help = nfct_help(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1440 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 1441 | if (!help || !help->helper) { |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1442 | /* such conntrack hasn't got any helper, abort */ |
| 1443 | err = -EINVAL; |
| 1444 | goto out; |
| 1445 | } |
| 1446 | |
| 1447 | exp = nf_conntrack_expect_alloc(ct); |
| 1448 | if (!exp) { |
| 1449 | err = -ENOMEM; |
| 1450 | goto out; |
| 1451 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1452 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1453 | exp->expectfn = NULL; |
| 1454 | exp->flags = 0; |
| 1455 | exp->master = ct; |
Patrick McHardy | 9457d85 | 2006-12-02 22:05:25 -0800 | [diff] [blame] | 1456 | exp->helper = NULL; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1457 | memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple)); |
| 1458 | memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple)); |
| 1459 | |
| 1460 | err = nf_conntrack_expect_related(exp); |
| 1461 | nf_conntrack_expect_put(exp); |
| 1462 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1463 | out: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1464 | nf_ct_put(nf_ct_tuplehash_to_ctrack(h)); |
| 1465 | return err; |
| 1466 | } |
| 1467 | |
| 1468 | static int |
| 1469 | ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb, |
| 1470 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1471 | { |
| 1472 | struct nf_conntrack_tuple tuple; |
| 1473 | struct nf_conntrack_expect *exp; |
| 1474 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1475 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1476 | int err = 0; |
| 1477 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1478 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1479 | return -EINVAL; |
| 1480 | |
| 1481 | if (!cda[CTA_EXPECT_TUPLE-1] |
| 1482 | || !cda[CTA_EXPECT_MASK-1] |
| 1483 | || !cda[CTA_EXPECT_MASTER-1]) |
| 1484 | return -EINVAL; |
| 1485 | |
| 1486 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1487 | if (err < 0) |
| 1488 | return err; |
| 1489 | |
| 1490 | write_lock_bh(&nf_conntrack_lock); |
| 1491 | exp = __nf_conntrack_expect_find(&tuple); |
| 1492 | |
| 1493 | if (!exp) { |
| 1494 | write_unlock_bh(&nf_conntrack_lock); |
| 1495 | err = -ENOENT; |
| 1496 | if (nlh->nlmsg_flags & NLM_F_CREATE) |
| 1497 | err = ctnetlink_create_expect(cda, u3); |
| 1498 | return err; |
| 1499 | } |
| 1500 | |
| 1501 | err = -EEXIST; |
| 1502 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) |
| 1503 | err = ctnetlink_change_expect(exp, cda); |
| 1504 | write_unlock_bh(&nf_conntrack_lock); |
| 1505 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1506 | return err; |
| 1507 | } |
| 1508 | |
| 1509 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1510 | static struct notifier_block ctnl_notifier = { |
| 1511 | .notifier_call = ctnetlink_conntrack_event, |
| 1512 | }; |
| 1513 | |
| 1514 | static struct notifier_block ctnl_notifier_exp = { |
| 1515 | .notifier_call = ctnetlink_expect_event, |
| 1516 | }; |
| 1517 | #endif |
| 1518 | |
| 1519 | static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = { |
| 1520 | [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack, |
| 1521 | .attr_count = CTA_MAX, }, |
| 1522 | [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack, |
| 1523 | .attr_count = CTA_MAX, }, |
| 1524 | [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack, |
| 1525 | .attr_count = CTA_MAX, }, |
| 1526 | [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack, |
| 1527 | .attr_count = CTA_MAX, }, |
| 1528 | }; |
| 1529 | |
| 1530 | static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = { |
| 1531 | [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect, |
| 1532 | .attr_count = CTA_EXPECT_MAX, }, |
| 1533 | [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect, |
| 1534 | .attr_count = CTA_EXPECT_MAX, }, |
| 1535 | [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect, |
| 1536 | .attr_count = CTA_EXPECT_MAX, }, |
| 1537 | }; |
| 1538 | |
| 1539 | static struct nfnetlink_subsystem ctnl_subsys = { |
| 1540 | .name = "conntrack", |
| 1541 | .subsys_id = NFNL_SUBSYS_CTNETLINK, |
| 1542 | .cb_count = IPCTNL_MSG_MAX, |
| 1543 | .cb = ctnl_cb, |
| 1544 | }; |
| 1545 | |
| 1546 | static struct nfnetlink_subsystem ctnl_exp_subsys = { |
| 1547 | .name = "conntrack_expect", |
| 1548 | .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP, |
| 1549 | .cb_count = IPCTNL_MSG_EXP_MAX, |
| 1550 | .cb = ctnl_exp_cb, |
| 1551 | }; |
| 1552 | |
Patrick McHardy | d2483dd | 2006-12-02 22:06:05 -0800 | [diff] [blame] | 1553 | MODULE_ALIAS("ip_conntrack_netlink"); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1554 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK); |
Pablo Neira Ayuso | 34f9a2e | 2006-02-04 02:11:41 -0800 | [diff] [blame] | 1555 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1556 | |
| 1557 | static int __init ctnetlink_init(void) |
| 1558 | { |
| 1559 | int ret; |
| 1560 | |
| 1561 | printk("ctnetlink v%s: registering with nfnetlink.\n", version); |
| 1562 | ret = nfnetlink_subsys_register(&ctnl_subsys); |
| 1563 | if (ret < 0) { |
| 1564 | printk("ctnetlink_init: cannot register with nfnetlink.\n"); |
| 1565 | goto err_out; |
| 1566 | } |
| 1567 | |
| 1568 | ret = nfnetlink_subsys_register(&ctnl_exp_subsys); |
| 1569 | if (ret < 0) { |
| 1570 | printk("ctnetlink_init: cannot register exp with nfnetlink.\n"); |
| 1571 | goto err_unreg_subsys; |
| 1572 | } |
| 1573 | |
| 1574 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1575 | ret = nf_conntrack_register_notifier(&ctnl_notifier); |
| 1576 | if (ret < 0) { |
| 1577 | printk("ctnetlink_init: cannot register notifier.\n"); |
| 1578 | goto err_unreg_exp_subsys; |
| 1579 | } |
| 1580 | |
| 1581 | ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp); |
| 1582 | if (ret < 0) { |
| 1583 | printk("ctnetlink_init: cannot expect register notifier.\n"); |
| 1584 | goto err_unreg_notifier; |
| 1585 | } |
| 1586 | #endif |
| 1587 | |
| 1588 | return 0; |
| 1589 | |
| 1590 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1591 | err_unreg_notifier: |
| 1592 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
| 1593 | err_unreg_exp_subsys: |
| 1594 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
| 1595 | #endif |
| 1596 | err_unreg_subsys: |
| 1597 | nfnetlink_subsys_unregister(&ctnl_subsys); |
| 1598 | err_out: |
| 1599 | return ret; |
| 1600 | } |
| 1601 | |
| 1602 | static void __exit ctnetlink_exit(void) |
| 1603 | { |
| 1604 | printk("ctnetlink: unregistering from nfnetlink.\n"); |
| 1605 | |
| 1606 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
Martin Josefsson | e64a70b | 2006-04-01 02:24:48 -0800 | [diff] [blame] | 1607 | nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1608 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
| 1609 | #endif |
| 1610 | |
| 1611 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
| 1612 | nfnetlink_subsys_unregister(&ctnl_subsys); |
| 1613 | return; |
| 1614 | } |
| 1615 | |
| 1616 | module_init(ctnetlink_init); |
| 1617 | module_exit(ctnetlink_exit); |