Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Packet matching code. |
| 3 | * |
| 4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/cache.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 12 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/skbuff.h> |
| 14 | #include <linux/kmod.h> |
| 15 | #include <linux/vmalloc.h> |
| 16 | #include <linux/netdevice.h> |
| 17 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/icmp.h> |
| 19 | #include <net/ip.h> |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 20 | #include <net/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <asm/uaccess.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 22 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/proc_fs.h> |
| 24 | #include <linux/err.h> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 25 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 27 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/netfilter_ipv4/ip_tables.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 29 | #include <net/netfilter/nf_log.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | MODULE_LICENSE("GPL"); |
| 32 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 33 | MODULE_DESCRIPTION("IPv4 packet filter"); |
| 34 | |
| 35 | /*#define DEBUG_IP_FIREWALL*/ |
| 36 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ |
| 37 | /*#define DEBUG_IP_FIREWALL_USER*/ |
| 38 | |
| 39 | #ifdef DEBUG_IP_FIREWALL |
| 40 | #define dprintf(format, args...) printk(format , ## args) |
| 41 | #else |
| 42 | #define dprintf(format, args...) |
| 43 | #endif |
| 44 | |
| 45 | #ifdef DEBUG_IP_FIREWALL_USER |
| 46 | #define duprintf(format, args...) printk(format , ## args) |
| 47 | #else |
| 48 | #define duprintf(format, args...) |
| 49 | #endif |
| 50 | |
| 51 | #ifdef CONFIG_NETFILTER_DEBUG |
| 52 | #define IP_NF_ASSERT(x) \ |
| 53 | do { \ |
| 54 | if (!(x)) \ |
| 55 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 56 | __func__, __FILE__, __LINE__); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | } while(0) |
| 58 | #else |
| 59 | #define IP_NF_ASSERT(x) |
| 60 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | #if 0 |
| 63 | /* All the better to debug you with... */ |
| 64 | #define static |
| 65 | #define inline |
| 66 | #endif |
| 67 | |
| 68 | /* |
| 69 | We keep a set of rules for each CPU, so we can avoid write-locking |
| 70 | them in the softirq when updating the counters and therefore |
| 71 | only need to read-lock in the softirq; doing a write_lock_bh() in user |
| 72 | context stops packets coming through and allows user context to read |
| 73 | the counters or update the rules. |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | Hence the start of any table is given by get_table() below. */ |
| 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | /* Returns whether matches rule or not. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 78 | /* Performance critical - called for every packet */ |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 79 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | ip_packet_match(const struct iphdr *ip, |
| 81 | const char *indev, |
| 82 | const char *outdev, |
| 83 | const struct ipt_ip *ipinfo, |
| 84 | int isfrag) |
| 85 | { |
| 86 | size_t i; |
| 87 | unsigned long ret; |
| 88 | |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 89 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, |
| 92 | IPT_INV_SRCIP) |
| 93 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, |
| 94 | IPT_INV_DSTIP)) { |
| 95 | dprintf("Source or dest mismatch.\n"); |
| 96 | |
| 97 | dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n", |
| 98 | NIPQUAD(ip->saddr), |
| 99 | NIPQUAD(ipinfo->smsk.s_addr), |
| 100 | NIPQUAD(ipinfo->src.s_addr), |
| 101 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
| 102 | dprintf("DST: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n", |
| 103 | NIPQUAD(ip->daddr), |
| 104 | NIPQUAD(ipinfo->dmsk.s_addr), |
| 105 | NIPQUAD(ipinfo->dst.s_addr), |
| 106 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 107 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | /* Look for ifname matches; this should unroll nicely. */ |
| 111 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { |
| 112 | ret |= (((const unsigned long *)indev)[i] |
| 113 | ^ ((const unsigned long *)ipinfo->iniface)[i]) |
| 114 | & ((const unsigned long *)ipinfo->iniface_mask)[i]; |
| 115 | } |
| 116 | |
| 117 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { |
| 118 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 119 | indev, ipinfo->iniface, |
| 120 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 121 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { |
| 125 | ret |= (((const unsigned long *)outdev)[i] |
| 126 | ^ ((const unsigned long *)ipinfo->outiface)[i]) |
| 127 | & ((const unsigned long *)ipinfo->outiface_mask)[i]; |
| 128 | } |
| 129 | |
| 130 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { |
| 131 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 132 | outdev, ipinfo->outiface, |
| 133 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 134 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | /* Check specific protocol */ |
| 138 | if (ipinfo->proto |
| 139 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { |
| 140 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
| 141 | ip->protocol, ipinfo->proto, |
| 142 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 143 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | /* If we have a fragment rule but the packet is not a fragment |
| 147 | * then we return zero */ |
| 148 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { |
| 149 | dprintf("Fragment rule but not fragment.%s\n", |
| 150 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 151 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 154 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | } |
| 156 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 157 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | ip_checkentry(const struct ipt_ip *ip) |
| 159 | { |
| 160 | if (ip->flags & ~IPT_F_MASK) { |
| 161 | duprintf("Unknown flag bits set: %08X\n", |
| 162 | ip->flags & ~IPT_F_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 163 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | if (ip->invflags & ~IPT_INV_MASK) { |
| 166 | duprintf("Unknown invflag bits set: %08X\n", |
| 167 | ip->invflags & ~IPT_INV_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 168 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 170 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 174 | ipt_error(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | const struct net_device *in, |
| 176 | const struct net_device *out, |
| 177 | unsigned int hooknum, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 178 | const struct xt_target *target, |
Patrick McHardy | fe1cb10 | 2006-08-22 00:35:47 -0700 | [diff] [blame] | 179 | const void *targinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
| 181 | if (net_ratelimit()) |
| 182 | printk("ip_tables: error: `%s'\n", (char *)targinfo); |
| 183 | |
| 184 | return NF_DROP; |
| 185 | } |
| 186 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 187 | /* Performance critical - called for every packet */ |
| 188 | static inline bool |
| 189 | do_match(struct ipt_entry_match *m, |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 190 | const struct sk_buff *skb, |
| 191 | const struct net_device *in, |
| 192 | const struct net_device *out, |
| 193 | int offset, |
| 194 | bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | { |
| 196 | /* Stop iteration if it doesn't match */ |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 197 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
Arnaldo Carvalho de Melo | c9bdd4b | 2007-03-12 20:09:15 -0300 | [diff] [blame] | 198 | offset, ip_hdrlen(skb), hotdrop)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 199 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | else |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 201 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | } |
| 203 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 204 | /* Performance critical */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | static inline struct ipt_entry * |
| 206 | get_entry(void *base, unsigned int offset) |
| 207 | { |
| 208 | return (struct ipt_entry *)(base + offset); |
| 209 | } |
| 210 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 211 | /* All zeroes == unconditional rule. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 212 | /* Mildly perf critical (only if packet tracing is on) */ |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 213 | static inline int |
| 214 | unconditional(const struct ipt_ip *ip) |
| 215 | { |
| 216 | unsigned int i; |
| 217 | |
| 218 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) |
| 219 | if (((__u32 *)ip)[i]) |
| 220 | return 0; |
| 221 | |
| 222 | return 1; |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 223 | #undef FWINV |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 227 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 228 | static const char *const hooknames[] = { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 229 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
| 230 | [NF_INET_LOCAL_IN] = "INPUT", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 231 | [NF_INET_FORWARD] = "FORWARD", |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 232 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
| 233 | [NF_INET_POST_ROUTING] = "POSTROUTING", |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 234 | }; |
| 235 | |
| 236 | enum nf_ip_trace_comments { |
| 237 | NF_IP_TRACE_COMMENT_RULE, |
| 238 | NF_IP_TRACE_COMMENT_RETURN, |
| 239 | NF_IP_TRACE_COMMENT_POLICY, |
| 240 | }; |
| 241 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 242 | static const char *const comments[] = { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 243 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
| 244 | [NF_IP_TRACE_COMMENT_RETURN] = "return", |
| 245 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", |
| 246 | }; |
| 247 | |
| 248 | static struct nf_loginfo trace_loginfo = { |
| 249 | .type = NF_LOG_TYPE_LOG, |
| 250 | .u = { |
| 251 | .log = { |
| 252 | .level = 4, |
| 253 | .logflags = NF_LOG_MASK, |
| 254 | }, |
| 255 | }, |
| 256 | }; |
| 257 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 258 | /* Mildly perf critical (only if packet tracing is on) */ |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 259 | static inline int |
| 260 | get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e, |
| 261 | char *hookname, char **chainname, |
| 262 | char **comment, unsigned int *rulenum) |
| 263 | { |
| 264 | struct ipt_standard_target *t = (void *)ipt_get_target(s); |
| 265 | |
| 266 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { |
| 267 | /* Head of user chain: ERROR target with chainname */ |
| 268 | *chainname = t->target.data; |
| 269 | (*rulenum) = 0; |
| 270 | } else if (s == e) { |
| 271 | (*rulenum)++; |
| 272 | |
| 273 | if (s->target_offset == sizeof(struct ipt_entry) |
| 274 | && strcmp(t->target.u.kernel.target->name, |
| 275 | IPT_STANDARD_TARGET) == 0 |
| 276 | && t->verdict < 0 |
| 277 | && unconditional(&s->ip)) { |
| 278 | /* Tail of chains: STANDARD target (return/policy) */ |
| 279 | *comment = *chainname == hookname |
| 280 | ? (char *)comments[NF_IP_TRACE_COMMENT_POLICY] |
| 281 | : (char *)comments[NF_IP_TRACE_COMMENT_RETURN]; |
| 282 | } |
| 283 | return 1; |
| 284 | } else |
| 285 | (*rulenum)++; |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static void trace_packet(struct sk_buff *skb, |
| 291 | unsigned int hook, |
| 292 | const struct net_device *in, |
| 293 | const struct net_device *out, |
Jan Engelhardt | ecb6f85 | 2008-01-31 03:54:47 -0800 | [diff] [blame] | 294 | const char *tablename, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 295 | struct xt_table_info *private, |
| 296 | struct ipt_entry *e) |
| 297 | { |
| 298 | void *table_base; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 299 | const struct ipt_entry *root; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 300 | char *hookname, *chainname, *comment; |
| 301 | unsigned int rulenum = 0; |
| 302 | |
| 303 | table_base = (void *)private->entries[smp_processor_id()]; |
| 304 | root = get_entry(table_base, private->hook_entry[hook]); |
| 305 | |
| 306 | hookname = chainname = (char *)hooknames[hook]; |
| 307 | comment = (char *)comments[NF_IP_TRACE_COMMENT_RULE]; |
| 308 | |
| 309 | IPT_ENTRY_ITERATE(root, |
| 310 | private->size - private->hook_entry[hook], |
| 311 | get_chainname_rulenum, |
| 312 | e, hookname, &chainname, &comment, &rulenum); |
| 313 | |
| 314 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, |
| 315 | "TRACE: %s:%s:%s:%u ", |
| 316 | tablename, chainname, comment, rulenum); |
| 317 | } |
| 318 | #endif |
| 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 321 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 322 | ipt_do_table(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | unsigned int hook, |
| 324 | const struct net_device *in, |
| 325 | const struct net_device *out, |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 326 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
| 328 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
| 329 | u_int16_t offset; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 330 | const struct iphdr *ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | u_int16_t datalen; |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 332 | bool hotdrop = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 334 | unsigned int verdict = NF_DROP; |
| 335 | const char *indev, *outdev; |
| 336 | void *table_base; |
| 337 | struct ipt_entry *e, *back; |
Patrick McHardy | 8311731 | 2006-08-17 18:13:53 -0700 | [diff] [blame] | 338 | struct xt_table_info *private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
| 340 | /* Initialization */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 341 | ip = ip_hdr(skb); |
| 342 | datalen = skb->len - ip->ihl * 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | indev = in ? in->name : nulldevname; |
| 344 | outdev = out ? out->name : nulldevname; |
| 345 | /* We handle fragments by dealing with the first fragment as |
| 346 | * if it was a normal packet. All other fragments are treated |
| 347 | * normally, except that they will NEVER match rules that ask |
| 348 | * things we don't know, ie. tcp syn flag or ports). If the |
| 349 | * rule is also a fragment-specific rule, non-fragments won't |
| 350 | * match it. */ |
| 351 | offset = ntohs(ip->frag_off) & IP_OFFSET; |
| 352 | |
| 353 | read_lock_bh(&table->lock); |
| 354 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Patrick McHardy | 8311731 | 2006-08-17 18:13:53 -0700 | [diff] [blame] | 355 | private = table->private; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 356 | table_base = (void *)private->entries[smp_processor_id()]; |
| 357 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | /* For return from builtin chain */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 360 | back = get_entry(table_base, private->underflow[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | do { |
| 363 | IP_NF_ASSERT(e); |
| 364 | IP_NF_ASSERT(back); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) { |
| 366 | struct ipt_entry_target *t; |
| 367 | |
| 368 | if (IPT_MATCH_ITERATE(e, do_match, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 369 | skb, in, out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | offset, &hotdrop) != 0) |
| 371 | goto no_match; |
| 372 | |
| 373 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); |
| 374 | |
| 375 | t = ipt_get_target(e); |
| 376 | IP_NF_ASSERT(t->u.kernel.target); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 377 | |
| 378 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 379 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
| 380 | /* The packet is traced: log it */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 381 | if (unlikely(skb->nf_trace)) |
| 382 | trace_packet(skb, hook, in, out, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 383 | table->name, private, e); |
| 384 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | /* Standard target? */ |
| 386 | if (!t->u.kernel.target->target) { |
| 387 | int v; |
| 388 | |
| 389 | v = ((struct ipt_standard_target *)t)->verdict; |
| 390 | if (v < 0) { |
| 391 | /* Pop from stack? */ |
| 392 | if (v != IPT_RETURN) { |
| 393 | verdict = (unsigned)(-v) - 1; |
| 394 | break; |
| 395 | } |
| 396 | e = back; |
| 397 | back = get_entry(table_base, |
| 398 | back->comefrom); |
| 399 | continue; |
| 400 | } |
Patrick McHardy | 0546534 | 2005-08-21 23:31:43 -0700 | [diff] [blame] | 401 | if (table_base + v != (void *)e + e->next_offset |
| 402 | && !(e->ip.flags & IPT_F_GOTO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | /* Save old back ptr in next entry */ |
| 404 | struct ipt_entry *next |
| 405 | = (void *)e + e->next_offset; |
| 406 | next->comefrom |
| 407 | = (void *)back - table_base; |
| 408 | /* set back pointer to next entry */ |
| 409 | back = next; |
| 410 | } |
| 411 | |
| 412 | e = get_entry(table_base, v); |
| 413 | } else { |
| 414 | /* Targets which reenter must return |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 415 | abs. verdicts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | #ifdef CONFIG_NETFILTER_DEBUG |
| 417 | ((struct ipt_entry *)table_base)->comefrom |
| 418 | = 0xeeeeeeec; |
| 419 | #endif |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 420 | verdict = t->u.kernel.target->target(skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | in, out, |
| 422 | hook, |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 423 | t->u.kernel.target, |
Patrick McHardy | fe1cb10 | 2006-08-22 00:35:47 -0700 | [diff] [blame] | 424 | t->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | |
| 426 | #ifdef CONFIG_NETFILTER_DEBUG |
| 427 | if (((struct ipt_entry *)table_base)->comefrom |
| 428 | != 0xeeeeeeec |
| 429 | && verdict == IPT_CONTINUE) { |
| 430 | printk("Target %s reentered!\n", |
| 431 | t->u.kernel.target->name); |
| 432 | verdict = NF_DROP; |
| 433 | } |
| 434 | ((struct ipt_entry *)table_base)->comefrom |
| 435 | = 0x57acc001; |
| 436 | #endif |
| 437 | /* Target might have changed stuff. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 438 | ip = ip_hdr(skb); |
| 439 | datalen = skb->len - ip->ihl * 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
| 441 | if (verdict == IPT_CONTINUE) |
| 442 | e = (void *)e + e->next_offset; |
| 443 | else |
| 444 | /* Verdict */ |
| 445 | break; |
| 446 | } |
| 447 | } else { |
| 448 | |
| 449 | no_match: |
| 450 | e = (void *)e + e->next_offset; |
| 451 | } |
| 452 | } while (!hotdrop); |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | read_unlock_bh(&table->lock); |
| 455 | |
| 456 | #ifdef DEBUG_ALLOW_ALL |
| 457 | return NF_ACCEPT; |
| 458 | #else |
| 459 | if (hotdrop) |
| 460 | return NF_DROP; |
| 461 | else return verdict; |
| 462 | #endif |
| 463 | } |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | /* Figures out from what hook each rule can be called: returns 0 if |
| 466 | there are loops. Puts hook bitmask in comefrom. */ |
| 467 | static int |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 468 | mark_source_chains(struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 469 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
| 471 | unsigned int hook; |
| 472 | |
| 473 | /* No recursion; use packet counter to save back ptrs (reset |
| 474 | to 0 as we leave), and comefrom to save source hook bitmask */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 475 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | unsigned int pos = newinfo->hook_entry[hook]; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 477 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | if (!(valid_hooks & (1 << hook))) |
| 480 | continue; |
| 481 | |
| 482 | /* Set initial back pointer. */ |
| 483 | e->counters.pcnt = pos; |
| 484 | |
| 485 | for (;;) { |
| 486 | struct ipt_standard_target *t |
| 487 | = (void *)ipt_get_target(e); |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 488 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 490 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | printk("iptables: loop hook %u pos %u %08X.\n", |
| 492 | hook, pos, e->comefrom); |
| 493 | return 0; |
| 494 | } |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 495 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
| 497 | /* Unconditional return/END. */ |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 498 | if ((e->target_offset == sizeof(struct ipt_entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | && (strcmp(t->target.u.user.name, |
| 500 | IPT_STANDARD_TARGET) == 0) |
| 501 | && t->verdict < 0 |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 502 | && unconditional(&e->ip)) || visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | unsigned int oldpos, size; |
| 504 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 505 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
| 506 | duprintf("mark_source_chains: bad " |
| 507 | "negative verdict (%i)\n", |
| 508 | t->verdict); |
| 509 | return 0; |
| 510 | } |
| 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | /* Return: backtrack through the last |
| 513 | big jump. */ |
| 514 | do { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 515 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | #ifdef DEBUG_IP_FIREWALL_USER |
| 517 | if (e->comefrom |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 518 | & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | duprintf("Back unset " |
| 520 | "on hook %u " |
| 521 | "rule %u\n", |
| 522 | hook, pos); |
| 523 | } |
| 524 | #endif |
| 525 | oldpos = pos; |
| 526 | pos = e->counters.pcnt; |
| 527 | e->counters.pcnt = 0; |
| 528 | |
| 529 | /* We're at the start. */ |
| 530 | if (pos == oldpos) |
| 531 | goto next; |
| 532 | |
| 533 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 534 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } while (oldpos == pos + e->next_offset); |
| 536 | |
| 537 | /* Move along one */ |
| 538 | size = e->next_offset; |
| 539 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 540 | (entry0 + pos + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | e->counters.pcnt = pos; |
| 542 | pos += size; |
| 543 | } else { |
| 544 | int newpos = t->verdict; |
| 545 | |
| 546 | if (strcmp(t->target.u.user.name, |
| 547 | IPT_STANDARD_TARGET) == 0 |
| 548 | && newpos >= 0) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 549 | if (newpos > newinfo->size - |
| 550 | sizeof(struct ipt_entry)) { |
| 551 | duprintf("mark_source_chains: " |
| 552 | "bad verdict (%i)\n", |
| 553 | newpos); |
| 554 | return 0; |
| 555 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | /* This a jump; chase it. */ |
| 557 | duprintf("Jump rule %u -> %u\n", |
| 558 | pos, newpos); |
| 559 | } else { |
| 560 | /* ... this is a fallthru */ |
| 561 | newpos = pos + e->next_offset; |
| 562 | } |
| 563 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 564 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | e->counters.pcnt = pos; |
| 566 | pos = newpos; |
| 567 | } |
| 568 | } |
| 569 | next: |
| 570 | duprintf("Finished chain %u\n", hook); |
| 571 | } |
| 572 | return 1; |
| 573 | } |
| 574 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 575 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
| 577 | { |
| 578 | if (i && (*i)-- == 0) |
| 579 | return 1; |
| 580 | |
| 581 | if (m->u.kernel.match->destroy) |
Patrick McHardy | efa7416 | 2006-08-22 00:36:37 -0700 | [diff] [blame] | 582 | m->u.kernel.match->destroy(m->u.kernel.match, m->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | module_put(m->u.kernel.match->me); |
| 584 | return 0; |
| 585 | } |
| 586 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 587 | static int |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 588 | check_entry(struct ipt_entry *e, const char *name) |
| 589 | { |
| 590 | struct ipt_entry_target *t; |
| 591 | |
| 592 | if (!ip_checkentry(&e->ip)) { |
| 593 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); |
| 594 | return -EINVAL; |
| 595 | } |
| 596 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 597 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
| 598 | e->next_offset) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 599 | return -EINVAL; |
| 600 | |
| 601 | t = ipt_get_target(e); |
| 602 | if (e->target_offset + t->u.target_size > e->next_offset) |
| 603 | return -EINVAL; |
| 604 | |
| 605 | return 0; |
| 606 | } |
| 607 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 608 | static int |
| 609 | check_match(struct ipt_entry_match *m, const char *name, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 610 | const struct ipt_ip *ip, |
| 611 | unsigned int hookmask, unsigned int *i) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 612 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 613 | struct xt_match *match; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 614 | int ret; |
| 615 | |
| 616 | match = m->u.kernel.match; |
| 617 | ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m), |
| 618 | name, hookmask, ip->proto, |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame^] | 619 | ip->invflags & IPT_INV_PROTO, ip, m->data); |
| 620 | if (ret < 0) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 621 | duprintf("ip_tables: check failed for `%s'.\n", |
| 622 | m->u.kernel.match->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame^] | 623 | return ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 624 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame^] | 625 | ++*i; |
| 626 | return 0; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 627 | } |
| 628 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 629 | static int |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 630 | find_check_match(struct ipt_entry_match *m, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 631 | const char *name, |
| 632 | const struct ipt_ip *ip, |
| 633 | unsigned int hookmask, |
| 634 | unsigned int *i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 636 | struct xt_match *match; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 637 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 639 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 640 | m->u.user.revision), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | "ipt_%s", m->u.user.name); |
| 642 | if (IS_ERR(match) || !match) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 643 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | return match ? PTR_ERR(match) : -ENOENT; |
| 645 | } |
| 646 | m->u.kernel.match = match; |
| 647 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 648 | ret = check_match(m, name, ip, hookmask, i); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 649 | if (ret) |
| 650 | goto err; |
| 651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 653 | err: |
| 654 | module_put(m->u.kernel.match->me); |
| 655 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | } |
| 657 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 658 | static int check_target(struct ipt_entry *e, const char *name) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 659 | { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 660 | struct ipt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 661 | struct xt_target *target; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 662 | int ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 663 | |
| 664 | t = ipt_get_target(e); |
| 665 | target = t->u.kernel.target; |
| 666 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), |
| 667 | name, e->comefrom, e->ip.proto, |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame^] | 668 | e->ip.invflags & IPT_INV_PROTO, e, t->data); |
| 669 | if (ret < 0) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 670 | duprintf("ip_tables: check failed for `%s'.\n", |
| 671 | t->u.kernel.target->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame^] | 672 | return ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 673 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame^] | 674 | return 0; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 677 | static int |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 678 | find_check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 679 | unsigned int *i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | { |
| 681 | struct ipt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 682 | struct xt_target *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | int ret; |
| 684 | unsigned int j; |
| 685 | |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 686 | ret = check_entry(e, name); |
| 687 | if (ret) |
| 688 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | j = 0; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 691 | ret = IPT_MATCH_ITERATE(e, find_check_match, name, &e->ip, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 692 | e->comefrom, &j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | if (ret != 0) |
| 694 | goto cleanup_matches; |
| 695 | |
| 696 | t = ipt_get_target(e); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 697 | target = try_then_request_module(xt_find_target(AF_INET, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 698 | t->u.user.name, |
| 699 | t->u.user.revision), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | "ipt_%s", t->u.user.name); |
| 701 | if (IS_ERR(target) || !target) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 702 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | ret = target ? PTR_ERR(target) : -ENOENT; |
| 704 | goto cleanup_matches; |
| 705 | } |
| 706 | t->u.kernel.target = target; |
| 707 | |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 708 | ret = check_target(e, name); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 709 | if (ret) |
| 710 | goto err; |
| 711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | (*i)++; |
| 713 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 714 | err: |
| 715 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | cleanup_matches: |
| 717 | IPT_MATCH_ITERATE(e, cleanup_match, &j); |
| 718 | return ret; |
| 719 | } |
| 720 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 721 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | check_entry_size_and_hooks(struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 723 | struct xt_table_info *newinfo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | unsigned char *base, |
| 725 | unsigned char *limit, |
| 726 | const unsigned int *hook_entries, |
| 727 | const unsigned int *underflows, |
| 728 | unsigned int *i) |
| 729 | { |
| 730 | unsigned int h; |
| 731 | |
| 732 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 |
| 733 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { |
| 734 | duprintf("Bad offset %p\n", e); |
| 735 | return -EINVAL; |
| 736 | } |
| 737 | |
| 738 | if (e->next_offset |
| 739 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { |
| 740 | duprintf("checking: element %p size %u\n", |
| 741 | e, e->next_offset); |
| 742 | return -EINVAL; |
| 743 | } |
| 744 | |
| 745 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 746 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | if ((unsigned char *)e - base == hook_entries[h]) |
| 748 | newinfo->hook_entry[h] = hook_entries[h]; |
| 749 | if ((unsigned char *)e - base == underflows[h]) |
| 750 | newinfo->underflow[h] = underflows[h]; |
| 751 | } |
| 752 | |
| 753 | /* FIXME: underflows must be unconditional, standard verdicts |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 754 | < 0 (not IPT_RETURN). --RR */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
| 756 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 757 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | e->comefrom = 0; |
| 759 | |
| 760 | (*i)++; |
| 761 | return 0; |
| 762 | } |
| 763 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 764 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
| 766 | { |
| 767 | struct ipt_entry_target *t; |
| 768 | |
| 769 | if (i && (*i)-- == 0) |
| 770 | return 1; |
| 771 | |
| 772 | /* Cleanup all matches */ |
| 773 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); |
| 774 | t = ipt_get_target(e); |
| 775 | if (t->u.kernel.target->destroy) |
Patrick McHardy | efa7416 | 2006-08-22 00:36:37 -0700 | [diff] [blame] | 776 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | module_put(t->u.kernel.target->me); |
| 778 | return 0; |
| 779 | } |
| 780 | |
| 781 | /* Checks and translates the user-supplied table segment (held in |
| 782 | newinfo) */ |
| 783 | static int |
| 784 | translate_table(const char *name, |
| 785 | unsigned int valid_hooks, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 786 | struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 787 | void *entry0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | unsigned int size, |
| 789 | unsigned int number, |
| 790 | const unsigned int *hook_entries, |
| 791 | const unsigned int *underflows) |
| 792 | { |
| 793 | unsigned int i; |
| 794 | int ret; |
| 795 | |
| 796 | newinfo->size = size; |
| 797 | newinfo->number = number; |
| 798 | |
| 799 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 800 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 802 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 803 | } |
| 804 | |
| 805 | duprintf("translate_table: size %u\n", newinfo->size); |
| 806 | i = 0; |
| 807 | /* Walk through entries, checking offsets. */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 808 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | check_entry_size_and_hooks, |
| 810 | newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 811 | entry0, |
| 812 | entry0 + size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | hook_entries, underflows, &i); |
| 814 | if (ret != 0) |
| 815 | return ret; |
| 816 | |
| 817 | if (i != number) { |
| 818 | duprintf("translate_table: %u not %u entries\n", |
| 819 | i, number); |
| 820 | return -EINVAL; |
| 821 | } |
| 822 | |
| 823 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 824 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | /* Only hooks which are valid */ |
| 826 | if (!(valid_hooks & (1 << i))) |
| 827 | continue; |
| 828 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 829 | duprintf("Invalid hook entry %u %u\n", |
| 830 | i, hook_entries[i]); |
| 831 | return -EINVAL; |
| 832 | } |
| 833 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 834 | duprintf("Invalid underflow %u %u\n", |
| 835 | i, underflows[i]); |
| 836 | return -EINVAL; |
| 837 | } |
| 838 | } |
| 839 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 840 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
| 841 | return -ELOOP; |
| 842 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | /* Finally, each sanity check must pass */ |
| 844 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 845 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 846 | find_check_entry, name, size, &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 848 | if (ret != 0) { |
| 849 | IPT_ENTRY_ITERATE(entry0, newinfo->size, |
| 850 | cleanup_entry, &i); |
| 851 | return ret; |
| 852 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
| 854 | /* And one copy for every other CPU */ |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 855 | for_each_possible_cpu(i) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 856 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
| 857 | memcpy(newinfo->entries[i], entry0, newinfo->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | } |
| 859 | |
| 860 | return ret; |
| 861 | } |
| 862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | /* Gets counters. */ |
| 864 | static inline int |
| 865 | add_entry_to_counter(const struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 866 | struct xt_counters total[], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | unsigned int *i) |
| 868 | { |
| 869 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); |
| 870 | |
| 871 | (*i)++; |
| 872 | return 0; |
| 873 | } |
| 874 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 875 | static inline int |
| 876 | set_entry_to_counter(const struct ipt_entry *e, |
| 877 | struct ipt_counters total[], |
| 878 | unsigned int *i) |
| 879 | { |
| 880 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); |
| 881 | |
| 882 | (*i)++; |
| 883 | return 0; |
| 884 | } |
| 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | static void |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 887 | get_counters(const struct xt_table_info *t, |
| 888 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | { |
| 890 | unsigned int cpu; |
| 891 | unsigned int i; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 892 | unsigned int curcpu; |
| 893 | |
| 894 | /* Instead of clearing (by a previous call to memset()) |
| 895 | * the counters and using adds, we set the counters |
| 896 | * with data used by 'current' CPU |
| 897 | * We dont care about preemption here. |
| 898 | */ |
| 899 | curcpu = raw_smp_processor_id(); |
| 900 | |
| 901 | i = 0; |
| 902 | IPT_ENTRY_ITERATE(t->entries[curcpu], |
| 903 | t->size, |
| 904 | set_entry_to_counter, |
| 905 | counters, |
| 906 | &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 908 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 909 | if (cpu == curcpu) |
| 910 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 912 | IPT_ENTRY_ITERATE(t->entries[cpu], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | t->size, |
| 914 | add_entry_to_counter, |
| 915 | counters, |
| 916 | &i); |
| 917 | } |
| 918 | } |
| 919 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 920 | static struct xt_counters * alloc_counters(struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 922 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 923 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 924 | const struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
| 926 | /* We need atomic snapshot of counters: rest doesn't change |
| 927 | (other than comefrom, which userspace doesn't care |
| 928 | about). */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 929 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 930 | counters = vmalloc_node(countersize, numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | |
| 932 | if (counters == NULL) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 933 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
| 935 | /* First, sum counters... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | write_lock_bh(&table->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 937 | get_counters(private, counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | write_unlock_bh(&table->lock); |
| 939 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 940 | return counters; |
| 941 | } |
| 942 | |
| 943 | static int |
| 944 | copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 945 | struct xt_table *table, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 946 | void __user *userptr) |
| 947 | { |
| 948 | unsigned int off, num; |
| 949 | struct ipt_entry *e; |
| 950 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 951 | const struct xt_table_info *private = table->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 952 | int ret = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 953 | const void *loc_cpu_entry; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 954 | |
| 955 | counters = alloc_counters(table); |
| 956 | if (IS_ERR(counters)) |
| 957 | return PTR_ERR(counters); |
| 958 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 959 | /* choose the copy that is on our node/cpu, ... |
| 960 | * This choice is lazy (because current thread is |
| 961 | * allowed to migrate to another cpu) |
| 962 | */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 963 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 964 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | ret = -EFAULT; |
| 966 | goto free_counters; |
| 967 | } |
| 968 | |
| 969 | /* FIXME: use iterator macros --RR */ |
| 970 | /* ... then go back and fix counters and names */ |
| 971 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 972 | unsigned int i; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 973 | const struct ipt_entry_match *m; |
| 974 | const struct ipt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 976 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | if (copy_to_user(userptr + off |
| 978 | + offsetof(struct ipt_entry, counters), |
| 979 | &counters[num], |
| 980 | sizeof(counters[num])) != 0) { |
| 981 | ret = -EFAULT; |
| 982 | goto free_counters; |
| 983 | } |
| 984 | |
| 985 | for (i = sizeof(struct ipt_entry); |
| 986 | i < e->target_offset; |
| 987 | i += m->u.match_size) { |
| 988 | m = (void *)e + i; |
| 989 | |
| 990 | if (copy_to_user(userptr + off + i |
| 991 | + offsetof(struct ipt_entry_match, |
| 992 | u.user.name), |
| 993 | m->u.kernel.match->name, |
| 994 | strlen(m->u.kernel.match->name)+1) |
| 995 | != 0) { |
| 996 | ret = -EFAULT; |
| 997 | goto free_counters; |
| 998 | } |
| 999 | } |
| 1000 | |
| 1001 | t = ipt_get_target(e); |
| 1002 | if (copy_to_user(userptr + off + e->target_offset |
| 1003 | + offsetof(struct ipt_entry_target, |
| 1004 | u.user.name), |
| 1005 | t->u.kernel.target->name, |
| 1006 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 1007 | ret = -EFAULT; |
| 1008 | goto free_counters; |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | free_counters: |
| 1013 | vfree(counters); |
| 1014 | return ret; |
| 1015 | } |
| 1016 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1017 | #ifdef CONFIG_COMPAT |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1018 | static void compat_standard_from_user(void *dst, void *src) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1019 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1020 | int v = *(compat_int_t *)src; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1021 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1022 | if (v > 0) |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1023 | v += xt_compat_calc_jump(AF_INET, v); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1024 | memcpy(dst, &v, sizeof(v)); |
| 1025 | } |
| 1026 | |
| 1027 | static int compat_standard_to_user(void __user *dst, void *src) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1028 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1029 | compat_int_t cv = *(int *)src; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1030 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1031 | if (cv > 0) |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1032 | cv -= xt_compat_calc_jump(AF_INET, cv); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1033 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1034 | } |
| 1035 | |
| 1036 | static inline int |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1037 | compat_calc_match(struct ipt_entry_match *m, int *size) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1038 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1039 | *size += xt_compat_match_offset(m->u.kernel.match); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1040 | return 0; |
| 1041 | } |
| 1042 | |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1043 | static int compat_calc_entry(struct ipt_entry *e, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1044 | const struct xt_table_info *info, |
| 1045 | void *base, struct xt_table_info *newinfo) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1046 | { |
| 1047 | struct ipt_entry_target *t; |
Dmitry Mishin | e5b5ef7 | 2007-01-04 12:14:41 -0800 | [diff] [blame] | 1048 | unsigned int entry_offset; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1049 | int off, i, ret; |
| 1050 | |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1051 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1052 | entry_offset = (void *)e - base; |
| 1053 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); |
| 1054 | t = ipt_get_target(e); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1055 | off += xt_compat_target_offset(t->u.kernel.target); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1056 | newinfo->size -= off; |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1057 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1058 | if (ret) |
| 1059 | return ret; |
| 1060 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1061 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1062 | if (info->hook_entry[i] && |
| 1063 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1064 | newinfo->hook_entry[i] -= off; |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1065 | if (info->underflow[i] && |
| 1066 | (e < (struct ipt_entry *)(base + info->underflow[i]))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1067 | newinfo->underflow[i] -= off; |
| 1068 | } |
| 1069 | return 0; |
| 1070 | } |
| 1071 | |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1072 | static int compat_table_info(const struct xt_table_info *info, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1073 | struct xt_table_info *newinfo) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1074 | { |
| 1075 | void *loc_cpu_entry; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1076 | |
| 1077 | if (!newinfo || !info) |
| 1078 | return -EINVAL; |
| 1079 | |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1080 | /* we dont care about newinfo->entries[] */ |
| 1081 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
| 1082 | newinfo->initial_entries = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1083 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
| 1084 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1085 | compat_calc_entry, info, loc_cpu_entry, |
| 1086 | newinfo); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1087 | } |
| 1088 | #endif |
| 1089 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1090 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1091 | { |
| 1092 | char name[IPT_TABLE_MAXNAMELEN]; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1093 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1094 | int ret; |
| 1095 | |
| 1096 | if (*len != sizeof(struct ipt_getinfo)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1097 | duprintf("length %u != %zu\n", *len, |
| 1098 | sizeof(struct ipt_getinfo)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1099 | return -EINVAL; |
| 1100 | } |
| 1101 | |
| 1102 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 1103 | return -EFAULT; |
| 1104 | |
| 1105 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; |
| 1106 | #ifdef CONFIG_COMPAT |
| 1107 | if (compat) |
| 1108 | xt_compat_lock(AF_INET); |
| 1109 | #endif |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1110 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1111 | "iptable_%s", name); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1112 | if (t && !IS_ERR(t)) { |
| 1113 | struct ipt_getinfo info; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1114 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1115 | |
| 1116 | #ifdef CONFIG_COMPAT |
| 1117 | if (compat) { |
| 1118 | struct xt_table_info tmp; |
| 1119 | ret = compat_table_info(private, &tmp); |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1120 | xt_compat_flush_offsets(AF_INET); |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1121 | private = &tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1122 | } |
| 1123 | #endif |
| 1124 | info.valid_hooks = t->valid_hooks; |
| 1125 | memcpy(info.hook_entry, private->hook_entry, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1126 | sizeof(info.hook_entry)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1127 | memcpy(info.underflow, private->underflow, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1128 | sizeof(info.underflow)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1129 | info.num_entries = private->number; |
| 1130 | info.size = private->size; |
| 1131 | strcpy(info.name, name); |
| 1132 | |
| 1133 | if (copy_to_user(user, &info, *len) != 0) |
| 1134 | ret = -EFAULT; |
| 1135 | else |
| 1136 | ret = 0; |
| 1137 | |
| 1138 | xt_table_unlock(t); |
| 1139 | module_put(t->me); |
| 1140 | } else |
| 1141 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1142 | #ifdef CONFIG_COMPAT |
| 1143 | if (compat) |
| 1144 | xt_compat_unlock(AF_INET); |
| 1145 | #endif |
| 1146 | return ret; |
| 1147 | } |
| 1148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1150 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | { |
| 1152 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1153 | struct ipt_get_entries get; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1154 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1156 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1157 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1158 | return -EINVAL; |
| 1159 | } |
| 1160 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1161 | return -EFAULT; |
| 1162 | if (*len != sizeof(struct ipt_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1163 | duprintf("get_entries: %u != %zu\n", |
| 1164 | *len, sizeof(get) + get.size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1165 | return -EINVAL; |
| 1166 | } |
| 1167 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1168 | t = xt_find_table_lock(net, AF_INET, get.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | if (t && !IS_ERR(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1170 | const struct xt_table_info *private = t->private; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1171 | duprintf("t->private->number = %u\n", private->number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1172 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1173 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | t, uptr->entrytable); |
| 1175 | else { |
| 1176 | duprintf("get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1177 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1178 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | } |
| 1180 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1181 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | } else |
| 1183 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1184 | |
| 1185 | return ret; |
| 1186 | } |
| 1187 | |
| 1188 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1189 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1190 | struct xt_table_info *newinfo, unsigned int num_counters, |
| 1191 | void __user *counters_ptr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1192 | { |
| 1193 | int ret; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1194 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1195 | struct xt_table_info *oldinfo; |
| 1196 | struct xt_counters *counters; |
| 1197 | void *loc_cpu_old_entry; |
| 1198 | |
| 1199 | ret = 0; |
| 1200 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); |
| 1201 | if (!counters) { |
| 1202 | ret = -ENOMEM; |
| 1203 | goto out; |
| 1204 | } |
| 1205 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1206 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1207 | "iptable_%s", name); |
| 1208 | if (!t || IS_ERR(t)) { |
| 1209 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1210 | goto free_newinfo_counters_untrans; |
| 1211 | } |
| 1212 | |
| 1213 | /* You lied! */ |
| 1214 | if (valid_hooks != t->valid_hooks) { |
| 1215 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1216 | valid_hooks, t->valid_hooks); |
| 1217 | ret = -EINVAL; |
| 1218 | goto put_module; |
| 1219 | } |
| 1220 | |
| 1221 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 1222 | if (!oldinfo) |
| 1223 | goto put_module; |
| 1224 | |
| 1225 | /* Update module usage count based on number of rules */ |
| 1226 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1227 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
| 1228 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1229 | (newinfo->number <= oldinfo->initial_entries)) |
| 1230 | module_put(t->me); |
| 1231 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1232 | (newinfo->number <= oldinfo->initial_entries)) |
| 1233 | module_put(t->me); |
| 1234 | |
| 1235 | /* Get the old counters. */ |
| 1236 | get_counters(oldinfo, counters); |
| 1237 | /* Decrease module usage counts and free resource */ |
| 1238 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1239 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
| 1240 | NULL); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1241 | xt_free_table_info(oldinfo); |
| 1242 | if (copy_to_user(counters_ptr, counters, |
| 1243 | sizeof(struct xt_counters) * num_counters) != 0) |
| 1244 | ret = -EFAULT; |
| 1245 | vfree(counters); |
| 1246 | xt_table_unlock(t); |
| 1247 | return ret; |
| 1248 | |
| 1249 | put_module: |
| 1250 | module_put(t->me); |
| 1251 | xt_table_unlock(t); |
| 1252 | free_newinfo_counters_untrans: |
| 1253 | vfree(counters); |
| 1254 | out: |
| 1255 | return ret; |
| 1256 | } |
| 1257 | |
| 1258 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1259 | do_replace(struct net *net, void __user *user, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | { |
| 1261 | int ret; |
| 1262 | struct ipt_replace tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1263 | struct xt_table_info *newinfo; |
| 1264 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
| 1266 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1267 | return -EFAULT; |
| 1268 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1269 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1270 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1271 | return -ENOMEM; |
| 1272 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1273 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | if (!newinfo) |
| 1275 | return -ENOMEM; |
| 1276 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1277 | /* choose the copy that is on our node/cpu */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1278 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1279 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | tmp.size) != 0) { |
| 1281 | ret = -EFAULT; |
| 1282 | goto free_newinfo; |
| 1283 | } |
| 1284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | ret = translate_table(tmp.name, tmp.valid_hooks, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1286 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | tmp.hook_entry, tmp.underflow); |
| 1288 | if (ret != 0) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1289 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | |
| 1291 | duprintf("ip_tables: Translated table\n"); |
| 1292 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1293 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1294 | tmp.num_counters, tmp.counters); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1295 | if (ret) |
| 1296 | goto free_newinfo_untrans; |
| 1297 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1299 | free_newinfo_untrans: |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1300 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1302 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | return ret; |
| 1304 | } |
| 1305 | |
| 1306 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
| 1307 | * and everything is OK. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1308 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | add_counter_to_entry(struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1310 | const struct xt_counters addme[], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | unsigned int *i) |
| 1312 | { |
| 1313 | #if 0 |
| 1314 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", |
| 1315 | *i, |
| 1316 | (long unsigned int)e->counters.pcnt, |
| 1317 | (long unsigned int)e->counters.bcnt, |
| 1318 | (long unsigned int)addme[*i].pcnt, |
| 1319 | (long unsigned int)addme[*i].bcnt); |
| 1320 | #endif |
| 1321 | |
| 1322 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); |
| 1323 | |
| 1324 | (*i)++; |
| 1325 | return 0; |
| 1326 | } |
| 1327 | |
| 1328 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1329 | do_add_counters(struct net *net, void __user *user, unsigned int len, int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | { |
| 1331 | unsigned int i; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1332 | struct xt_counters_info tmp; |
| 1333 | struct xt_counters *paddc; |
| 1334 | unsigned int num_counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1335 | const char *name; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1336 | int size; |
| 1337 | void *ptmp; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1338 | struct xt_table *t; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1339 | const struct xt_table_info *private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | int ret = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1341 | void *loc_cpu_entry; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1342 | #ifdef CONFIG_COMPAT |
| 1343 | struct compat_xt_counters_info compat_tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1345 | if (compat) { |
| 1346 | ptmp = &compat_tmp; |
| 1347 | size = sizeof(struct compat_xt_counters_info); |
| 1348 | } else |
| 1349 | #endif |
| 1350 | { |
| 1351 | ptmp = &tmp; |
| 1352 | size = sizeof(struct xt_counters_info); |
| 1353 | } |
| 1354 | |
| 1355 | if (copy_from_user(ptmp, user, size) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | return -EFAULT; |
| 1357 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1358 | #ifdef CONFIG_COMPAT |
| 1359 | if (compat) { |
| 1360 | num_counters = compat_tmp.num_counters; |
| 1361 | name = compat_tmp.name; |
| 1362 | } else |
| 1363 | #endif |
| 1364 | { |
| 1365 | num_counters = tmp.num_counters; |
| 1366 | name = tmp.name; |
| 1367 | } |
| 1368 | |
| 1369 | if (len != size + num_counters * sizeof(struct xt_counters)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | return -EINVAL; |
| 1371 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1372 | paddc = vmalloc_node(len - size, numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | if (!paddc) |
| 1374 | return -ENOMEM; |
| 1375 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1376 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | ret = -EFAULT; |
| 1378 | goto free; |
| 1379 | } |
| 1380 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1381 | t = xt_find_table_lock(net, AF_INET, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | if (!t || IS_ERR(t)) { |
| 1383 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1384 | goto free; |
| 1385 | } |
| 1386 | |
| 1387 | write_lock_bh(&t->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1388 | private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1389 | if (private->number != num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | ret = -EINVAL; |
| 1391 | goto unlock_up_free; |
| 1392 | } |
| 1393 | |
| 1394 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1395 | /* Choose the copy that is on our node */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1396 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1397 | IPT_ENTRY_ITERATE(loc_cpu_entry, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1398 | private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | add_counter_to_entry, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1400 | paddc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | &i); |
| 1402 | unlock_up_free: |
| 1403 | write_unlock_bh(&t->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1404 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | module_put(t->me); |
| 1406 | free: |
| 1407 | vfree(paddc); |
| 1408 | |
| 1409 | return ret; |
| 1410 | } |
| 1411 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1412 | #ifdef CONFIG_COMPAT |
| 1413 | struct compat_ipt_replace { |
| 1414 | char name[IPT_TABLE_MAXNAMELEN]; |
| 1415 | u32 valid_hooks; |
| 1416 | u32 num_entries; |
| 1417 | u32 size; |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1418 | u32 hook_entry[NF_INET_NUMHOOKS]; |
| 1419 | u32 underflow[NF_INET_NUMHOOKS]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1420 | u32 num_counters; |
| 1421 | compat_uptr_t counters; /* struct ipt_counters * */ |
| 1422 | struct compat_ipt_entry entries[0]; |
| 1423 | }; |
| 1424 | |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1425 | static int |
| 1426 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1427 | unsigned int *size, struct xt_counters *counters, |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1428 | unsigned int *i) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1429 | { |
Al Viro | 3e597c6 | 2006-09-24 23:42:20 +0100 | [diff] [blame] | 1430 | struct ipt_entry_target *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1431 | struct compat_ipt_entry __user *ce; |
| 1432 | u_int16_t target_offset, next_offset; |
| 1433 | compat_uint_t origsize; |
| 1434 | int ret; |
| 1435 | |
| 1436 | ret = -EFAULT; |
| 1437 | origsize = *size; |
| 1438 | ce = (struct compat_ipt_entry __user *)*dstptr; |
Patrick McHardy | 7800007 | 2006-05-03 23:20:27 -0700 | [diff] [blame] | 1439 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1440 | goto out; |
| 1441 | |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1442 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) |
| 1443 | goto out; |
| 1444 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1445 | *dstptr += sizeof(struct compat_ipt_entry); |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1446 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
| 1447 | |
Patrick McHardy | ac8e27f | 2007-12-17 21:45:52 -0800 | [diff] [blame] | 1448 | ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1449 | target_offset = e->target_offset - (origsize - *size); |
| 1450 | if (ret) |
| 1451 | goto out; |
| 1452 | t = ipt_get_target(e); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1453 | ret = xt_compat_target_to_user(t, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1454 | if (ret) |
| 1455 | goto out; |
| 1456 | ret = -EFAULT; |
| 1457 | next_offset = e->next_offset - (origsize - *size); |
Patrick McHardy | 7800007 | 2006-05-03 23:20:27 -0700 | [diff] [blame] | 1458 | if (put_user(target_offset, &ce->target_offset)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1459 | goto out; |
Patrick McHardy | 7800007 | 2006-05-03 23:20:27 -0700 | [diff] [blame] | 1460 | if (put_user(next_offset, &ce->next_offset)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1461 | goto out; |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1462 | |
| 1463 | (*i)++; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1464 | return 0; |
| 1465 | out: |
| 1466 | return ret; |
| 1467 | } |
| 1468 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1469 | static int |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1470 | compat_find_calc_match(struct ipt_entry_match *m, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1471 | const char *name, |
| 1472 | const struct ipt_ip *ip, |
| 1473 | unsigned int hookmask, |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1474 | int *size, unsigned int *i) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1475 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1476 | struct xt_match *match; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1477 | |
| 1478 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1479 | m->u.user.revision), |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1480 | "ipt_%s", m->u.user.name); |
| 1481 | if (IS_ERR(match) || !match) { |
| 1482 | duprintf("compat_check_calc_match: `%s' not found\n", |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1483 | m->u.user.name); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1484 | return match ? PTR_ERR(match) : -ENOENT; |
| 1485 | } |
| 1486 | m->u.kernel.match = match; |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1487 | *size += xt_compat_match_offset(match); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1488 | |
| 1489 | (*i)++; |
| 1490 | return 0; |
| 1491 | } |
| 1492 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1493 | static int |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1494 | compat_release_match(struct ipt_entry_match *m, unsigned int *i) |
| 1495 | { |
| 1496 | if (i && (*i)-- == 0) |
| 1497 | return 1; |
| 1498 | |
| 1499 | module_put(m->u.kernel.match->me); |
| 1500 | return 0; |
| 1501 | } |
| 1502 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1503 | static int |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1504 | compat_release_entry(struct compat_ipt_entry *e, unsigned int *i) |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1505 | { |
| 1506 | struct ipt_entry_target *t; |
| 1507 | |
| 1508 | if (i && (*i)-- == 0) |
| 1509 | return 1; |
| 1510 | |
| 1511 | /* Cleanup all matches */ |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1512 | COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL); |
| 1513 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1514 | module_put(t->u.kernel.target->me); |
| 1515 | return 0; |
| 1516 | } |
| 1517 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1518 | static int |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1519 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1520 | struct xt_table_info *newinfo, |
| 1521 | unsigned int *size, |
| 1522 | unsigned char *base, |
| 1523 | unsigned char *limit, |
| 1524 | unsigned int *hook_entries, |
| 1525 | unsigned int *underflows, |
| 1526 | unsigned int *i, |
| 1527 | const char *name) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1528 | { |
| 1529 | struct ipt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1530 | struct xt_target *target; |
Dmitry Mishin | e5b5ef7 | 2007-01-04 12:14:41 -0800 | [diff] [blame] | 1531 | unsigned int entry_offset; |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1532 | unsigned int j; |
| 1533 | int ret, off, h; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1534 | |
| 1535 | duprintf("check_compat_entry_size_and_hooks %p\n", e); |
| 1536 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 |
| 1537 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { |
| 1538 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
| 1539 | return -EINVAL; |
| 1540 | } |
| 1541 | |
| 1542 | if (e->next_offset < sizeof(struct compat_ipt_entry) + |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1543 | sizeof(struct compat_xt_entry_target)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1544 | duprintf("checking: element %p size %u\n", |
| 1545 | e, e->next_offset); |
| 1546 | return -EINVAL; |
| 1547 | } |
| 1548 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1549 | /* For purposes of check_entry casting the compat entry is fine */ |
| 1550 | ret = check_entry((struct ipt_entry *)e, name); |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 1551 | if (ret) |
| 1552 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 1553 | |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1554 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1555 | entry_offset = (void *)e - (void *)base; |
| 1556 | j = 0; |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1557 | ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name, |
| 1558 | &e->ip, e->comefrom, &off, &j); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1559 | if (ret != 0) |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1560 | goto release_matches; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1561 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1562 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1563 | target = try_then_request_module(xt_find_target(AF_INET, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1564 | t->u.user.name, |
| 1565 | t->u.user.revision), |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1566 | "ipt_%s", t->u.user.name); |
| 1567 | if (IS_ERR(target) || !target) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 1568 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1569 | t->u.user.name); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1570 | ret = target ? PTR_ERR(target) : -ENOENT; |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1571 | goto release_matches; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1572 | } |
| 1573 | t->u.kernel.target = target; |
| 1574 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1575 | off += xt_compat_target_offset(target); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1576 | *size += off; |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1577 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1578 | if (ret) |
| 1579 | goto out; |
| 1580 | |
| 1581 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1582 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1583 | if ((unsigned char *)e - base == hook_entries[h]) |
| 1584 | newinfo->hook_entry[h] = hook_entries[h]; |
| 1585 | if ((unsigned char *)e - base == underflows[h]) |
| 1586 | newinfo->underflow[h] = underflows[h]; |
| 1587 | } |
| 1588 | |
| 1589 | /* Clear counters and comefrom */ |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1590 | memset(&e->counters, 0, sizeof(e->counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1591 | e->comefrom = 0; |
| 1592 | |
| 1593 | (*i)++; |
| 1594 | return 0; |
Patrick McHardy | bec71b1 | 2006-09-20 12:04:08 -0700 | [diff] [blame] | 1595 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1596 | out: |
Patrick McHardy | bec71b1 | 2006-09-20 12:04:08 -0700 | [diff] [blame] | 1597 | module_put(t->u.kernel.target->me); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1598 | release_matches: |
| 1599 | IPT_MATCH_ITERATE(e, compat_release_match, &j); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1600 | return ret; |
| 1601 | } |
| 1602 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1603 | static int |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1604 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1605 | unsigned int *size, const char *name, |
| 1606 | struct xt_table_info *newinfo, unsigned char *base) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1607 | { |
| 1608 | struct ipt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1609 | struct xt_target *target; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1610 | struct ipt_entry *de; |
| 1611 | unsigned int origsize; |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1612 | int ret, h; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1613 | |
| 1614 | ret = 0; |
| 1615 | origsize = *size; |
| 1616 | de = (struct ipt_entry *)*dstptr; |
| 1617 | memcpy(de, e, sizeof(struct ipt_entry)); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1618 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1619 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1620 | *dstptr += sizeof(struct ipt_entry); |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1621 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
| 1622 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1623 | ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user, |
| 1624 | dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1625 | if (ret) |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1626 | return ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1627 | de->target_offset = e->target_offset - (origsize - *size); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1628 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1629 | target = t->u.kernel.target; |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1630 | xt_compat_target_from_user(t, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1631 | |
| 1632 | de->next_offset = e->next_offset - (origsize - *size); |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1633 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1634 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1635 | newinfo->hook_entry[h] -= origsize - *size; |
| 1636 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1637 | newinfo->underflow[h] -= origsize - *size; |
| 1638 | } |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1639 | return ret; |
| 1640 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1641 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1642 | static int |
| 1643 | compat_check_entry(struct ipt_entry *e, const char *name, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1644 | unsigned int *i) |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1645 | { |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1646 | unsigned int j; |
| 1647 | int ret; |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1648 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1649 | j = 0; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1650 | ret = IPT_MATCH_ITERATE(e, check_match, name, &e->ip, |
| 1651 | e->comefrom, &j); |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1652 | if (ret) |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1653 | goto cleanup_matches; |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1654 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1655 | ret = check_target(e, name); |
| 1656 | if (ret) |
| 1657 | goto cleanup_matches; |
| 1658 | |
| 1659 | (*i)++; |
| 1660 | return 0; |
| 1661 | |
| 1662 | cleanup_matches: |
| 1663 | IPT_MATCH_ITERATE(e, cleanup_match, &j); |
| 1664 | return ret; |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1665 | } |
| 1666 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1667 | static int |
| 1668 | translate_compat_table(const char *name, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1669 | unsigned int valid_hooks, |
| 1670 | struct xt_table_info **pinfo, |
| 1671 | void **pentry0, |
| 1672 | unsigned int total_size, |
| 1673 | unsigned int number, |
| 1674 | unsigned int *hook_entries, |
| 1675 | unsigned int *underflows) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1676 | { |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1677 | unsigned int i, j; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1678 | struct xt_table_info *newinfo, *info; |
| 1679 | void *pos, *entry0, *entry1; |
| 1680 | unsigned int size; |
| 1681 | int ret; |
| 1682 | |
| 1683 | info = *pinfo; |
| 1684 | entry0 = *pentry0; |
| 1685 | size = total_size; |
| 1686 | info->number = number; |
| 1687 | |
| 1688 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1689 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1690 | info->hook_entry[i] = 0xFFFFFFFF; |
| 1691 | info->underflow[i] = 0xFFFFFFFF; |
| 1692 | } |
| 1693 | |
| 1694 | duprintf("translate_compat_table: size %u\n", info->size); |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1695 | j = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1696 | xt_compat_lock(AF_INET); |
| 1697 | /* Walk through entries, checking offsets. */ |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1698 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
| 1699 | check_compat_entry_size_and_hooks, |
| 1700 | info, &size, entry0, |
| 1701 | entry0 + total_size, |
| 1702 | hook_entries, underflows, &j, name); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1703 | if (ret != 0) |
| 1704 | goto out_unlock; |
| 1705 | |
| 1706 | ret = -EINVAL; |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1707 | if (j != number) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1708 | duprintf("translate_compat_table: %u not %u entries\n", |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1709 | j, number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1710 | goto out_unlock; |
| 1711 | } |
| 1712 | |
| 1713 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1714 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1715 | /* Only hooks which are valid */ |
| 1716 | if (!(valid_hooks & (1 << i))) |
| 1717 | continue; |
| 1718 | if (info->hook_entry[i] == 0xFFFFFFFF) { |
| 1719 | duprintf("Invalid hook entry %u %u\n", |
| 1720 | i, hook_entries[i]); |
| 1721 | goto out_unlock; |
| 1722 | } |
| 1723 | if (info->underflow[i] == 0xFFFFFFFF) { |
| 1724 | duprintf("Invalid underflow %u %u\n", |
| 1725 | i, underflows[i]); |
| 1726 | goto out_unlock; |
| 1727 | } |
| 1728 | } |
| 1729 | |
| 1730 | ret = -ENOMEM; |
| 1731 | newinfo = xt_alloc_table_info(size); |
| 1732 | if (!newinfo) |
| 1733 | goto out_unlock; |
| 1734 | |
| 1735 | newinfo->number = number; |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1736 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1737 | newinfo->hook_entry[i] = info->hook_entry[i]; |
| 1738 | newinfo->underflow[i] = info->underflow[i]; |
| 1739 | } |
| 1740 | entry1 = newinfo->entries[raw_smp_processor_id()]; |
| 1741 | pos = entry1; |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1742 | size = total_size; |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1743 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1744 | compat_copy_entry_from_user, |
| 1745 | &pos, &size, name, newinfo, entry1); |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1746 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1747 | xt_compat_unlock(AF_INET); |
| 1748 | if (ret) |
| 1749 | goto free_newinfo; |
| 1750 | |
| 1751 | ret = -ELOOP; |
| 1752 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) |
| 1753 | goto free_newinfo; |
| 1754 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1755 | i = 0; |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1756 | ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1757 | name, &i); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1758 | if (ret) { |
| 1759 | j -= i; |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1760 | COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, |
| 1761 | compat_release_entry, &j); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1762 | IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); |
| 1763 | xt_free_table_info(newinfo); |
| 1764 | return ret; |
| 1765 | } |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1766 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1767 | /* And one copy for every other CPU */ |
Andrew Morton | fb1bb34 | 2006-06-25 05:46:43 -0700 | [diff] [blame] | 1768 | for_each_possible_cpu(i) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1769 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
| 1770 | memcpy(newinfo->entries[i], entry1, newinfo->size); |
| 1771 | |
| 1772 | *pinfo = newinfo; |
| 1773 | *pentry0 = entry1; |
| 1774 | xt_free_table_info(info); |
| 1775 | return 0; |
| 1776 | |
| 1777 | free_newinfo: |
| 1778 | xt_free_table_info(newinfo); |
| 1779 | out: |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1780 | COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1781 | return ret; |
| 1782 | out_unlock: |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1783 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1784 | xt_compat_unlock(AF_INET); |
| 1785 | goto out; |
| 1786 | } |
| 1787 | |
| 1788 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1789 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1790 | { |
| 1791 | int ret; |
| 1792 | struct compat_ipt_replace tmp; |
| 1793 | struct xt_table_info *newinfo; |
| 1794 | void *loc_cpu_entry; |
| 1795 | |
| 1796 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1797 | return -EFAULT; |
| 1798 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1799 | /* overflow check */ |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1800 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1801 | return -ENOMEM; |
| 1802 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1803 | return -ENOMEM; |
| 1804 | |
| 1805 | newinfo = xt_alloc_table_info(tmp.size); |
| 1806 | if (!newinfo) |
| 1807 | return -ENOMEM; |
| 1808 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1809 | /* choose the copy that is on our node/cpu */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1810 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1811 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
| 1812 | tmp.size) != 0) { |
| 1813 | ret = -EFAULT; |
| 1814 | goto free_newinfo; |
| 1815 | } |
| 1816 | |
| 1817 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1818 | &newinfo, &loc_cpu_entry, tmp.size, |
| 1819 | tmp.num_entries, tmp.hook_entry, |
| 1820 | tmp.underflow); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1821 | if (ret != 0) |
| 1822 | goto free_newinfo; |
| 1823 | |
| 1824 | duprintf("compat_do_replace: Translated table\n"); |
| 1825 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1826 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1827 | tmp.num_counters, compat_ptr(tmp.counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1828 | if (ret) |
| 1829 | goto free_newinfo_untrans; |
| 1830 | return 0; |
| 1831 | |
| 1832 | free_newinfo_untrans: |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1833 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1834 | free_newinfo: |
| 1835 | xt_free_table_info(newinfo); |
| 1836 | return ret; |
| 1837 | } |
| 1838 | |
| 1839 | static int |
| 1840 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1841 | unsigned int len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1842 | { |
| 1843 | int ret; |
| 1844 | |
| 1845 | if (!capable(CAP_NET_ADMIN)) |
| 1846 | return -EPERM; |
| 1847 | |
| 1848 | switch (cmd) { |
| 1849 | case IPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1850 | ret = compat_do_replace(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1851 | break; |
| 1852 | |
| 1853 | case IPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1854 | ret = do_add_counters(sock_net(sk), user, len, 1); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1855 | break; |
| 1856 | |
| 1857 | default: |
| 1858 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); |
| 1859 | ret = -EINVAL; |
| 1860 | } |
| 1861 | |
| 1862 | return ret; |
| 1863 | } |
| 1864 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1865 | struct compat_ipt_get_entries { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1866 | char name[IPT_TABLE_MAXNAMELEN]; |
| 1867 | compat_uint_t size; |
| 1868 | struct compat_ipt_entry entrytable[0]; |
| 1869 | }; |
| 1870 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1871 | static int |
| 1872 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, |
| 1873 | void __user *userptr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1874 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1875 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1876 | const struct xt_table_info *private = table->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1877 | void __user *pos; |
| 1878 | unsigned int size; |
| 1879 | int ret = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1880 | const void *loc_cpu_entry; |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1881 | unsigned int i = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1882 | |
| 1883 | counters = alloc_counters(table); |
| 1884 | if (IS_ERR(counters)) |
| 1885 | return PTR_ERR(counters); |
| 1886 | |
| 1887 | /* choose the copy that is on our node/cpu, ... |
| 1888 | * This choice is lazy (because current thread is |
| 1889 | * allowed to migrate to another cpu) |
| 1890 | */ |
| 1891 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
| 1892 | pos = userptr; |
| 1893 | size = total_size; |
| 1894 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1895 | compat_copy_entry_to_user, |
| 1896 | &pos, &size, counters, &i); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1897 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1898 | vfree(counters); |
| 1899 | return ret; |
| 1900 | } |
| 1901 | |
| 1902 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1903 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
| 1904 | int *len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1905 | { |
| 1906 | int ret; |
| 1907 | struct compat_ipt_get_entries get; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1908 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1909 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1910 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1911 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1912 | return -EINVAL; |
| 1913 | } |
| 1914 | |
| 1915 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1916 | return -EFAULT; |
| 1917 | |
| 1918 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1919 | duprintf("compat_get_entries: %u != %zu\n", |
| 1920 | *len, sizeof(get) + get.size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1921 | return -EINVAL; |
| 1922 | } |
| 1923 | |
| 1924 | xt_compat_lock(AF_INET); |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1925 | t = xt_find_table_lock(net, AF_INET, get.name); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1926 | if (t && !IS_ERR(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1927 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1928 | struct xt_table_info info; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1929 | duprintf("t->private->number = %u\n", private->number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1930 | ret = compat_table_info(private, &info); |
| 1931 | if (!ret && get.size == info.size) { |
| 1932 | ret = compat_copy_entries_to_user(private->size, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1933 | t, uptr->entrytable); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1934 | } else if (!ret) { |
| 1935 | duprintf("compat_get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1936 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1937 | ret = -EAGAIN; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1938 | } |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1939 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1940 | module_put(t->me); |
| 1941 | xt_table_unlock(t); |
| 1942 | } else |
| 1943 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1944 | |
| 1945 | xt_compat_unlock(AF_INET); |
| 1946 | return ret; |
| 1947 | } |
| 1948 | |
Patrick McHardy | 79030ed | 2006-09-20 12:05:08 -0700 | [diff] [blame] | 1949 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
| 1950 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1951 | static int |
| 1952 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1953 | { |
| 1954 | int ret; |
| 1955 | |
Björn Steinbrink | 82fac05 | 2006-10-20 00:21:10 -0700 | [diff] [blame] | 1956 | if (!capable(CAP_NET_ADMIN)) |
| 1957 | return -EPERM; |
| 1958 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1959 | switch (cmd) { |
| 1960 | case IPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1961 | ret = get_info(sock_net(sk), user, len, 1); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1962 | break; |
| 1963 | case IPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1964 | ret = compat_get_entries(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1965 | break; |
| 1966 | default: |
Patrick McHardy | 79030ed | 2006-09-20 12:05:08 -0700 | [diff] [blame] | 1967 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1968 | } |
| 1969 | return ret; |
| 1970 | } |
| 1971 | #endif |
| 1972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | static int |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1974 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | { |
| 1976 | int ret; |
| 1977 | |
| 1978 | if (!capable(CAP_NET_ADMIN)) |
| 1979 | return -EPERM; |
| 1980 | |
| 1981 | switch (cmd) { |
| 1982 | case IPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1983 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1984 | break; |
| 1985 | |
| 1986 | case IPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1987 | ret = do_add_counters(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | break; |
| 1989 | |
| 1990 | default: |
| 1991 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); |
| 1992 | ret = -EINVAL; |
| 1993 | } |
| 1994 | |
| 1995 | return ret; |
| 1996 | } |
| 1997 | |
| 1998 | static int |
| 1999 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 2000 | { |
| 2001 | int ret; |
| 2002 | |
| 2003 | if (!capable(CAP_NET_ADMIN)) |
| 2004 | return -EPERM; |
| 2005 | |
| 2006 | switch (cmd) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2007 | case IPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2008 | ret = get_info(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | break; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2010 | |
| 2011 | case IPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2012 | ret = get_entries(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2013 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | |
| 2015 | case IPT_SO_GET_REVISION_MATCH: |
| 2016 | case IPT_SO_GET_REVISION_TARGET: { |
| 2017 | struct ipt_get_revision rev; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2018 | int target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | |
| 2020 | if (*len != sizeof(rev)) { |
| 2021 | ret = -EINVAL; |
| 2022 | break; |
| 2023 | } |
| 2024 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 2025 | ret = -EFAULT; |
| 2026 | break; |
| 2027 | } |
| 2028 | |
| 2029 | if (cmd == IPT_SO_GET_REVISION_TARGET) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2030 | target = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | else |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2032 | target = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2034 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
| 2035 | rev.revision, |
| 2036 | target, &ret), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | "ipt_%s", rev.name); |
| 2038 | break; |
| 2039 | } |
| 2040 | |
| 2041 | default: |
| 2042 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); |
| 2043 | ret = -EINVAL; |
| 2044 | } |
| 2045 | |
| 2046 | return ret; |
| 2047 | } |
| 2048 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2049 | struct xt_table *ipt_register_table(struct net *net, struct xt_table *table, |
| 2050 | const struct ipt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | { |
| 2052 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2053 | struct xt_table_info *newinfo; |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 2054 | struct xt_table_info bootstrap |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2056 | void *loc_cpu_entry; |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 2057 | struct xt_table *new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2059 | newinfo = xt_alloc_table_info(repl->size); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2060 | if (!newinfo) { |
| 2061 | ret = -ENOMEM; |
| 2062 | goto out; |
| 2063 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2065 | /* choose the copy on our node/cpu, but dont care about preemption */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2066 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 2067 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | |
| 2069 | ret = translate_table(table->name, table->valid_hooks, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2070 | newinfo, loc_cpu_entry, repl->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | repl->num_entries, |
| 2072 | repl->hook_entry, |
| 2073 | repl->underflow); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2074 | if (ret != 0) |
| 2075 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2077 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 2078 | if (IS_ERR(new_table)) { |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2079 | ret = PTR_ERR(new_table); |
| 2080 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | } |
| 2082 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2083 | return new_table; |
| 2084 | |
| 2085 | out_free: |
| 2086 | xt_free_table_info(newinfo); |
| 2087 | out: |
| 2088 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | } |
| 2090 | |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 2091 | void ipt_unregister_table(struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2093 | struct xt_table_info *private; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2094 | void *loc_cpu_entry; |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 2095 | struct module *table_owner = table->me; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2096 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2097 | private = xt_unregister_table(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | |
| 2099 | /* Decrease module usage counts and free resources */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2100 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
| 2101 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 2102 | if (private->number > private->initial_entries) |
| 2103 | module_put(table_owner); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2104 | xt_free_table_info(private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | } |
| 2106 | |
| 2107 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2108 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 2110 | u_int8_t type, u_int8_t code, |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2111 | bool invert) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | { |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2113 | return ((test_type == 0xFF) || |
| 2114 | (type == test_type && code >= min_code && code <= max_code)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | ^ invert; |
| 2116 | } |
| 2117 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2118 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | icmp_match(const struct sk_buff *skb, |
| 2120 | const struct net_device *in, |
| 2121 | const struct net_device *out, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 2122 | const struct xt_match *match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | const void *matchinfo, |
| 2124 | int offset, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2125 | unsigned int protoff, |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 2126 | bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 2128 | const struct icmphdr *ic; |
| 2129 | struct icmphdr _icmph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | const struct ipt_icmp *icmpinfo = matchinfo; |
| 2131 | |
| 2132 | /* Must not be a fragment. */ |
| 2133 | if (offset) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2134 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2136 | ic = skb_header_pointer(skb, protoff, sizeof(_icmph), &_icmph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | if (ic == NULL) { |
| 2138 | /* We've been asked to examine this packet, and we |
| 2139 | * can't. Hence, no choice but to drop. |
| 2140 | */ |
| 2141 | duprintf("Dropping evil ICMP tinygram.\n"); |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 2142 | *hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2143 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | } |
| 2145 | |
| 2146 | return icmp_type_code_match(icmpinfo->type, |
| 2147 | icmpinfo->code[0], |
| 2148 | icmpinfo->code[1], |
| 2149 | ic->type, ic->code, |
| 2150 | !!(icmpinfo->invflags&IPT_ICMP_INV)); |
| 2151 | } |
| 2152 | |
| 2153 | /* Called when user tries to insert an entry of this type. */ |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 2154 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | icmp_checkentry(const char *tablename, |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2156 | const void *entry, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 2157 | const struct xt_match *match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | void *matchinfo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | unsigned int hook_mask) |
| 2160 | { |
| 2161 | const struct ipt_icmp *icmpinfo = matchinfo; |
| 2162 | |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2163 | /* Must specify no unknown invflags */ |
| 2164 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | } |
| 2166 | |
| 2167 | /* The built-in targets: standard (NULL) and error. */ |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 2168 | static struct xt_target ipt_standard_target __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2169 | .name = IPT_STANDARD_TARGET, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2170 | .targetsize = sizeof(int), |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2171 | .family = AF_INET, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2172 | #ifdef CONFIG_COMPAT |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 2173 | .compatsize = sizeof(compat_int_t), |
| 2174 | .compat_from_user = compat_standard_from_user, |
| 2175 | .compat_to_user = compat_standard_to_user, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2176 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | }; |
| 2178 | |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 2179 | static struct xt_target ipt_error_target __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | .name = IPT_ERROR_TARGET, |
| 2181 | .target = ipt_error, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2182 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2183 | .family = AF_INET, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | }; |
| 2185 | |
| 2186 | static struct nf_sockopt_ops ipt_sockopts = { |
| 2187 | .pf = PF_INET, |
| 2188 | .set_optmin = IPT_BASE_CTL, |
| 2189 | .set_optmax = IPT_SO_SET_MAX+1, |
| 2190 | .set = do_ipt_set_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2191 | #ifdef CONFIG_COMPAT |
| 2192 | .compat_set = compat_do_ipt_set_ctl, |
| 2193 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | .get_optmin = IPT_BASE_CTL, |
| 2195 | .get_optmax = IPT_SO_GET_MAX+1, |
| 2196 | .get = do_ipt_get_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2197 | #ifdef CONFIG_COMPAT |
| 2198 | .compat_get = compat_do_ipt_get_ctl, |
| 2199 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 2200 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | }; |
| 2202 | |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 2203 | static struct xt_match icmp_matchstruct __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | .name = "icmp", |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2205 | .match = icmp_match, |
| 2206 | .matchsize = sizeof(struct ipt_icmp), |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2207 | .checkentry = icmp_checkentry, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2208 | .proto = IPPROTO_ICMP, |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2209 | .family = AF_INET, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | }; |
| 2211 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2212 | static int __net_init ip_tables_net_init(struct net *net) |
| 2213 | { |
| 2214 | return xt_proto_init(net, AF_INET); |
| 2215 | } |
| 2216 | |
| 2217 | static void __net_exit ip_tables_net_exit(struct net *net) |
| 2218 | { |
| 2219 | xt_proto_fini(net, AF_INET); |
| 2220 | } |
| 2221 | |
| 2222 | static struct pernet_operations ip_tables_net_ops = { |
| 2223 | .init = ip_tables_net_init, |
| 2224 | .exit = ip_tables_net_exit, |
| 2225 | }; |
| 2226 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2227 | static int __init ip_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | { |
| 2229 | int ret; |
| 2230 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2231 | ret = register_pernet_subsys(&ip_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2232 | if (ret < 0) |
| 2233 | goto err1; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2235 | /* Noone else will be downing sem now, so we won't sleep */ |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2236 | ret = xt_register_target(&ipt_standard_target); |
| 2237 | if (ret < 0) |
| 2238 | goto err2; |
| 2239 | ret = xt_register_target(&ipt_error_target); |
| 2240 | if (ret < 0) |
| 2241 | goto err3; |
| 2242 | ret = xt_register_match(&icmp_matchstruct); |
| 2243 | if (ret < 0) |
| 2244 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | |
| 2246 | /* Register setsockopt */ |
| 2247 | ret = nf_register_sockopt(&ipt_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2248 | if (ret < 0) |
| 2249 | goto err5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | |
Dan Aloni | 0236e66 | 2007-07-09 13:20:12 -0700 | [diff] [blame] | 2251 | printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2253 | |
| 2254 | err5: |
| 2255 | xt_unregister_match(&icmp_matchstruct); |
| 2256 | err4: |
| 2257 | xt_unregister_target(&ipt_error_target); |
| 2258 | err3: |
| 2259 | xt_unregister_target(&ipt_standard_target); |
| 2260 | err2: |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2261 | unregister_pernet_subsys(&ip_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2262 | err1: |
| 2263 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | } |
| 2265 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2266 | static void __exit ip_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | { |
| 2268 | nf_unregister_sockopt(&ipt_sockopts); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2269 | |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2270 | xt_unregister_match(&icmp_matchstruct); |
| 2271 | xt_unregister_target(&ipt_error_target); |
| 2272 | xt_unregister_target(&ipt_standard_target); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2273 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2274 | unregister_pernet_subsys(&ip_tables_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | } |
| 2276 | |
| 2277 | EXPORT_SYMBOL(ipt_register_table); |
| 2278 | EXPORT_SYMBOL(ipt_unregister_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | EXPORT_SYMBOL(ipt_do_table); |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2280 | module_init(ip_tables_init); |
| 2281 | module_exit(ip_tables_fini); |