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> |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 6 | * Copyright (C) 2006-2010 Patrick McHardy <kaber@trash.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/cache.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 14 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/skbuff.h> |
| 16 | #include <linux/kmod.h> |
| 17 | #include <linux/vmalloc.h> |
| 18 | #include <linux/netdevice.h> |
| 19 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/icmp.h> |
| 21 | #include <net/ip.h> |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 22 | #include <net/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <asm/uaccess.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 24 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/proc_fs.h> |
| 26 | #include <linux/err.h> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 27 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 29 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/netfilter_ipv4/ip_tables.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 31 | #include <net/netfilter/nf_log.h> |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 32 | #include "../../netfilter/xt_repldata.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | MODULE_LICENSE("GPL"); |
| 35 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 36 | MODULE_DESCRIPTION("IPv4 packet filter"); |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #ifdef CONFIG_NETFILTER_DEBUG |
Stephen Hemminger | af56760 | 2010-05-13 15:00:20 +0200 | [diff] [blame] | 39 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #else |
| 41 | #define IP_NF_ASSERT(x) |
| 42 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 44 | void *ipt_alloc_initial_table(const struct xt_table *info) |
| 45 | { |
| 46 | return xt_alloc_initial_table(ipt, IPT); |
| 47 | } |
| 48 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | /* Returns whether matches rule or not. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 51 | /* Performance critical - called for every packet */ |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 52 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | ip_packet_match(const struct iphdr *ip, |
| 54 | const char *indev, |
| 55 | const char *outdev, |
| 56 | const struct ipt_ip *ipinfo, |
| 57 | int isfrag) |
| 58 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | unsigned long ret; |
| 60 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 61 | if (NF_INVF(ipinfo, IPT_INV_SRCIP, |
| 62 | (ip->saddr & ipinfo->smsk.s_addr) != ipinfo->src.s_addr) || |
| 63 | NF_INVF(ipinfo, IPT_INV_DSTIP, |
| 64 | (ip->daddr & ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr)) |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 65 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 67 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 69 | if (NF_INVF(ipinfo, IPT_INV_VIA_IN, ret != 0)) |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 70 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 72 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 74 | if (NF_INVF(ipinfo, IPT_INV_VIA_OUT, ret != 0)) |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 75 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | /* Check specific protocol */ |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 78 | if (ipinfo->proto && |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 79 | NF_INVF(ipinfo, IPT_INV_PROTO, ip->protocol != ipinfo->proto)) |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 80 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | /* If we have a fragment rule but the packet is not a fragment |
| 83 | * then we return zero */ |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 84 | if (NF_INVF(ipinfo, IPT_INV_FRAG, |
| 85 | (ipinfo->flags & IPT_F_FRAG) && !isfrag)) |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 86 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 88 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | } |
| 90 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 91 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | ip_checkentry(const struct ipt_ip *ip) |
| 93 | { |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 94 | if (ip->flags & ~IPT_F_MASK) |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 95 | return false; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 96 | if (ip->invflags & ~IPT_INV_MASK) |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 97 | return false; |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 98 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 102 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 104 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | return NF_DROP; |
| 107 | } |
| 108 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 109 | /* Performance critical */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | static inline struct ipt_entry * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 111 | get_entry(const void *base, unsigned int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
| 113 | return (struct ipt_entry *)(base + offset); |
| 114 | } |
| 115 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 116 | /* All zeroes == unconditional rule. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 117 | /* Mildly perf critical (only if packet tracing is on) */ |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 118 | static inline bool unconditional(const struct ipt_entry *e) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 119 | { |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 120 | static const struct ipt_ip uncond; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 121 | |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 122 | return e->target_offset == sizeof(struct ipt_entry) && |
| 123 | memcmp(&e->ip, &uncond, sizeof(uncond)) == 0; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 124 | } |
| 125 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 126 | /* for const-correctness */ |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 127 | static inline const struct xt_entry_target * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 128 | ipt_get_target_c(const struct ipt_entry *e) |
| 129 | { |
| 130 | return ipt_get_target((struct ipt_entry *)e); |
| 131 | } |
| 132 | |
Gao feng | f016588 | 2013-03-21 19:48:42 +0000 | [diff] [blame] | 133 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 134 | static const char *const hooknames[] = { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 135 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
| 136 | [NF_INET_LOCAL_IN] = "INPUT", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 137 | [NF_INET_FORWARD] = "FORWARD", |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 138 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
| 139 | [NF_INET_POST_ROUTING] = "POSTROUTING", |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 140 | }; |
| 141 | |
| 142 | enum nf_ip_trace_comments { |
| 143 | NF_IP_TRACE_COMMENT_RULE, |
| 144 | NF_IP_TRACE_COMMENT_RETURN, |
| 145 | NF_IP_TRACE_COMMENT_POLICY, |
| 146 | }; |
| 147 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 148 | static const char *const comments[] = { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 149 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
| 150 | [NF_IP_TRACE_COMMENT_RETURN] = "return", |
| 151 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", |
| 152 | }; |
| 153 | |
| 154 | static struct nf_loginfo trace_loginfo = { |
| 155 | .type = NF_LOG_TYPE_LOG, |
| 156 | .u = { |
| 157 | .log = { |
| 158 | .level = 4, |
| 159 | .logflags = NF_LOG_MASK, |
| 160 | }, |
| 161 | }, |
| 162 | }; |
| 163 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 164 | /* Mildly perf critical (only if packet tracing is on) */ |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 165 | static inline int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 166 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 167 | const char *hookname, const char **chainname, |
| 168 | const char **comment, unsigned int *rulenum) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 169 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 170 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 171 | |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 172 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 173 | /* Head of user chain: ERROR target with chainname */ |
| 174 | *chainname = t->target.data; |
| 175 | (*rulenum) = 0; |
| 176 | } else if (s == e) { |
| 177 | (*rulenum)++; |
| 178 | |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 179 | if (unconditional(s) && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 180 | strcmp(t->target.u.kernel.target->name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 181 | XT_STANDARD_TARGET) == 0 && |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 182 | t->verdict < 0) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 183 | /* Tail of chains: STANDARD target (return/policy) */ |
| 184 | *comment = *chainname == hookname |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 185 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
| 186 | : comments[NF_IP_TRACE_COMMENT_RETURN]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 187 | } |
| 188 | return 1; |
| 189 | } else |
| 190 | (*rulenum)++; |
| 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
Eric W. Biederman | 9dff2c9 | 2015-09-15 20:04:17 -0500 | [diff] [blame] | 195 | static void trace_packet(struct net *net, |
| 196 | const struct sk_buff *skb, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 197 | unsigned int hook, |
| 198 | const struct net_device *in, |
| 199 | const struct net_device *out, |
Jan Engelhardt | ecb6f85 | 2008-01-31 03:54:47 -0800 | [diff] [blame] | 200 | const char *tablename, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 201 | const struct xt_table_info *private, |
| 202 | const struct ipt_entry *e) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 203 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 204 | const struct ipt_entry *root; |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 205 | const char *hookname, *chainname, *comment; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 206 | const struct ipt_entry *iter; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 207 | unsigned int rulenum = 0; |
| 208 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 209 | root = get_entry(private->entries, private->hook_entry[hook]); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 210 | |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 211 | hookname = chainname = hooknames[hook]; |
| 212 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 213 | |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 214 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
| 215 | if (get_chainname_rulenum(iter, e, hookname, |
| 216 | &chainname, &comment, &rulenum) != 0) |
| 217 | break; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 218 | |
Pablo Neira Ayuso | 4017a7e | 2015-03-02 01:10:28 +0100 | [diff] [blame] | 219 | nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
| 220 | "TRACE: %s:%s:%s:%u ", |
| 221 | tablename, chainname, comment, rulenum); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 222 | } |
| 223 | #endif |
| 224 | |
Florian Westphal | 6c7941d | 2015-07-14 17:51:10 +0200 | [diff] [blame] | 225 | static inline |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 226 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) |
| 227 | { |
| 228 | return (void *)entry + entry->next_offset; |
| 229 | } |
| 230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 232 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 233 | ipt_do_table(struct sk_buff *skb, |
David S. Miller | 1c491ba | 2015-04-03 20:56:08 -0400 | [diff] [blame] | 234 | const struct nf_hook_state *state, |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 235 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | { |
Eric W. Biederman | 6cb8ff3f1 | 2015-09-18 14:32:55 -0500 | [diff] [blame] | 237 | unsigned int hook = state->hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 239 | const struct iphdr *ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 241 | unsigned int verdict = NF_DROP; |
| 242 | const char *indev, *outdev; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 243 | const void *table_base; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 244 | struct ipt_entry *e, **jumpstack; |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 245 | unsigned int stackidx, cpu; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 246 | const struct xt_table_info *private; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 247 | struct xt_action_param acpar; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 248 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | /* Initialization */ |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 251 | stackidx = 0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 252 | ip = ip_hdr(skb); |
David S. Miller | 1c491ba | 2015-04-03 20:56:08 -0400 | [diff] [blame] | 253 | indev = state->in ? state->in->name : nulldevname; |
| 254 | outdev = state->out ? state->out->name : nulldevname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | /* We handle fragments by dealing with the first fragment as |
| 256 | * if it was a normal packet. All other fragments are treated |
| 257 | * normally, except that they will NEVER match rules that ask |
| 258 | * things we don't know, ie. tcp syn flag or ports). If the |
| 259 | * rule is also a fragment-specific rule, non-fragments won't |
| 260 | * match it. */ |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 261 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
| 262 | acpar.thoff = ip_hdrlen(skb); |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 263 | acpar.hotdrop = false; |
Eric W. Biederman | 156c196 | 2015-09-18 14:32:58 -0500 | [diff] [blame] | 264 | acpar.net = state->net; |
David S. Miller | 1c491ba | 2015-04-03 20:56:08 -0400 | [diff] [blame] | 265 | acpar.in = state->in; |
| 266 | acpar.out = state->out; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 267 | acpar.family = NFPROTO_IPV4; |
| 268 | acpar.hooknum = hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 271 | local_bh_disable(); |
| 272 | addend = xt_write_recseq_begin(); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 273 | private = table->private; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 274 | cpu = smp_processor_id(); |
Will Deacon | b416c14 | 2013-10-21 13:14:53 +0100 | [diff] [blame] | 275 | /* |
| 276 | * Ensure we load private-> members after we've fetched the base |
| 277 | * pointer. |
| 278 | */ |
| 279 | smp_read_barrier_depends(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 280 | table_base = private->entries; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 281 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 282 | |
| 283 | /* Switch to alternate jumpstack if we're being invoked via TEE. |
| 284 | * TEE issues XT_CONTINUE verdict on original skb so we must not |
| 285 | * clobber the jumpstack. |
| 286 | * |
| 287 | * For recursion via REJECT or SYNPROXY the stack will be clobbered |
| 288 | * but it is no problem since absolute verdict is issued by these. |
| 289 | */ |
Florian Westphal | dcebd31 | 2015-07-14 17:51:09 +0200 | [diff] [blame] | 290 | if (static_key_false(&xt_tee_enabled)) |
| 291 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 292 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 293 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | do { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 296 | const struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 297 | const struct xt_entry_match *ematch; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 298 | struct xt_counters *counter; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | IP_NF_ASSERT(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 301 | if (!ip_packet_match(ip, indev, outdev, |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 302 | &e->ip, acpar.fragoff)) { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 303 | no_match: |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 304 | e = ipt_next_entry(e); |
| 305 | continue; |
| 306 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame] | 308 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 309 | acpar.match = ematch->u.kernel.match; |
| 310 | acpar.matchinfo = ematch->data; |
| 311 | if (!acpar.match->match(skb, &acpar)) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 312 | goto no_match; |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame] | 313 | } |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 314 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 315 | counter = xt_get_this_cpu_counter(&e->counters); |
| 316 | ADD_COUNTER(*counter, skb->len, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 318 | t = ipt_get_target(e); |
| 319 | IP_NF_ASSERT(t->u.kernel.target); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 320 | |
Gao feng | f016588 | 2013-03-21 19:48:42 +0000 | [diff] [blame] | 321 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 322 | /* The packet is traced: log it */ |
| 323 | if (unlikely(skb->nf_trace)) |
Eric W. Biederman | 9dff2c9 | 2015-09-15 20:04:17 -0500 | [diff] [blame] | 324 | trace_packet(state->net, skb, hook, state->in, |
| 325 | state->out, table->name, private, e); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 326 | #endif |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 327 | /* Standard target? */ |
| 328 | if (!t->u.kernel.target->target) { |
| 329 | int v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 331 | v = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 332 | if (v < 0) { |
| 333 | /* Pop from stack? */ |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 334 | if (v != XT_RETURN) { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 335 | verdict = (unsigned int)(-v) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | break; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 337 | } |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 338 | if (stackidx == 0) { |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 339 | e = get_entry(table_base, |
| 340 | private->underflow[hook]); |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 341 | } else { |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 342 | e = jumpstack[--stackidx]; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 343 | e = ipt_next_entry(e); |
| 344 | } |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 345 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 347 | if (table_base + v != ipt_next_entry(e) && |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 348 | !(e->ip.flags & IPT_F_GOTO)) |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 349 | jumpstack[stackidx++] = e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 351 | e = get_entry(table_base, v); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 352 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 354 | |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 355 | acpar.target = t->u.kernel.target; |
| 356 | acpar.targinfo = t->data; |
Jan Engelhardt | bb70dfa | 2009-04-15 21:40:13 +0200 | [diff] [blame] | 357 | |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 358 | verdict = t->u.kernel.target->target(skb, &acpar); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 359 | /* Target might have changed stuff. */ |
| 360 | ip = ip_hdr(skb); |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 361 | if (verdict == XT_CONTINUE) |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 362 | e = ipt_next_entry(e); |
| 363 | else |
| 364 | /* Verdict */ |
| 365 | break; |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 366 | } while (!acpar.hotdrop); |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 367 | |
Ian Morris | 24cebe3 | 2015-10-14 23:17:07 +0100 | [diff] [blame] | 368 | xt_write_recseq_end(addend); |
| 369 | local_bh_enable(); |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 370 | |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 371 | if (acpar.hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | return NF_DROP; |
| 373 | else return verdict; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | /* Figures out from what hook each rule can be called: returns 0 if |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 377 | there are loops. Puts hook bitmask in comefrom. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | static int |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 379 | mark_source_chains(const struct xt_table_info *newinfo, |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 380 | unsigned int valid_hooks, void *entry0, |
| 381 | unsigned int *offsets) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | { |
| 383 | unsigned int hook; |
| 384 | |
| 385 | /* No recursion; use packet counter to save back ptrs (reset |
| 386 | to 0 as we leave), and comefrom to save source hook bitmask */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 387 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | unsigned int pos = newinfo->hook_entry[hook]; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 389 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | if (!(valid_hooks & (1 << hook))) |
| 392 | continue; |
| 393 | |
| 394 | /* Set initial back pointer. */ |
| 395 | e->counters.pcnt = pos; |
| 396 | |
| 397 | for (;;) { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 398 | const struct xt_standard_target *t |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 399 | = (void *)ipt_get_target_c(e); |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 400 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 402 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | return 0; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 404 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 405 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
| 407 | /* Unconditional return/END. */ |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 408 | if ((unconditional(e) && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 409 | (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 410 | XT_STANDARD_TARGET) == 0) && |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 411 | t->verdict < 0) || visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | unsigned int oldpos, size; |
| 413 | |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 414 | if ((strcmp(t->target.u.user.name, |
Ian Morris | 24cebe3 | 2015-10-14 23:17:07 +0100 | [diff] [blame] | 415 | XT_STANDARD_TARGET) == 0) && |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 416 | t->verdict < -NF_MAX_VERDICT - 1) |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 417 | return 0; |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | /* Return: backtrack through the last |
| 420 | big jump. */ |
| 421 | do { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 422 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | oldpos = pos; |
| 424 | pos = e->counters.pcnt; |
| 425 | e->counters.pcnt = 0; |
| 426 | |
| 427 | /* We're at the start. */ |
| 428 | if (pos == oldpos) |
| 429 | goto next; |
| 430 | |
| 431 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 432 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } while (oldpos == pos + e->next_offset); |
| 434 | |
| 435 | /* Move along one */ |
| 436 | size = e->next_offset; |
| 437 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 438 | (entry0 + pos + size); |
Florian Westphal | f24e230 | 2016-04-01 14:17:21 +0200 | [diff] [blame] | 439 | if (pos + size >= newinfo->size) |
| 440 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | e->counters.pcnt = pos; |
| 442 | pos += size; |
| 443 | } else { |
| 444 | int newpos = t->verdict; |
| 445 | |
| 446 | if (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 447 | XT_STANDARD_TARGET) == 0 && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 448 | newpos >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | /* This a jump; chase it. */ |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 450 | if (!xt_find_jump_offset(offsets, newpos, |
| 451 | newinfo->number)) |
| 452 | return 0; |
Florian Westphal | 3647234 | 2016-04-01 14:17:22 +0200 | [diff] [blame] | 453 | e = (struct ipt_entry *) |
| 454 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } else { |
| 456 | /* ... this is a fallthru */ |
| 457 | newpos = pos + e->next_offset; |
Florian Westphal | f24e230 | 2016-04-01 14:17:21 +0200 | [diff] [blame] | 458 | if (newpos >= newinfo->size) |
| 459 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 462 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | e->counters.pcnt = pos; |
| 464 | pos = newpos; |
| 465 | } |
| 466 | } |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 467 | next: ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
| 469 | return 1; |
| 470 | } |
| 471 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 472 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | { |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 474 | struct xt_mtdtor_param par; |
| 475 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 476 | par.net = net; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 477 | par.match = m->u.kernel.match; |
| 478 | par.matchinfo = m->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 479 | par.family = NFPROTO_IPV4; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 480 | if (par.match->destroy != NULL) |
| 481 | par.match->destroy(&par); |
| 482 | module_put(par.match->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 485 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 486 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 487 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 488 | const struct ipt_ip *ip = par->entryinfo; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 489 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 490 | par->match = m->u.kernel.match; |
| 491 | par->matchinfo = m->data; |
| 492 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 493 | return xt_check_match(par, m->u.match_size - sizeof(*m), |
| 494 | ip->proto, ip->invflags & IPT_INV_PROTO); |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 495 | } |
| 496 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 497 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 498 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 500 | struct xt_match *match; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 501 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 503 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
| 504 | m->u.user.revision); |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 505 | if (IS_ERR(match)) |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 506 | return PTR_ERR(match); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | m->u.kernel.match = match; |
| 508 | |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 509 | ret = check_match(m, par); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 510 | if (ret) |
| 511 | goto err; |
| 512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 514 | err: |
| 515 | module_put(m->u.kernel.match->me); |
| 516 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | } |
| 518 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 519 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 520 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 521 | struct xt_entry_target *t = ipt_get_target(e); |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 522 | struct xt_tgchk_param par = { |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 523 | .net = net, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 524 | .table = name, |
| 525 | .entryinfo = e, |
| 526 | .target = t->u.kernel.target, |
| 527 | .targinfo = t->data, |
| 528 | .hook_mask = e->comefrom, |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 529 | .family = NFPROTO_IPV4, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 530 | }; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 531 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 532 | return xt_check_target(&par, t->u.target_size - sizeof(*t), |
| 533 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 534 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 536 | static int |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 537 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 538 | unsigned int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 540 | struct xt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 541 | struct xt_target *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | int ret; |
| 543 | unsigned int j; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 544 | struct xt_mtchk_param mtpar; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 545 | struct xt_entry_match *ematch; |
Pablo Neira Ayuso | 92b4423 | 2016-04-29 10:39:34 +0200 | [diff] [blame] | 546 | unsigned long pcnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
Pablo Neira Ayuso | 92b4423 | 2016-04-29 10:39:34 +0200 | [diff] [blame] | 548 | pcnt = xt_percpu_counter_alloc(); |
| 549 | if (IS_ERR_VALUE(pcnt)) |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 550 | return -ENOMEM; |
Pablo Neira Ayuso | 92b4423 | 2016-04-29 10:39:34 +0200 | [diff] [blame] | 551 | e->counters.pcnt = pcnt; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | j = 0; |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 554 | mtpar.net = net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 555 | mtpar.table = name; |
| 556 | mtpar.entryinfo = &e->ip; |
| 557 | mtpar.hook_mask = e->comefrom; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 558 | mtpar.family = NFPROTO_IPV4; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 559 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 560 | ret = find_check_match(ematch, &mtpar); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 561 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 562 | goto cleanup_matches; |
| 563 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 564 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
| 566 | t = ipt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 567 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
| 568 | t->u.user.revision); |
| 569 | if (IS_ERR(target)) { |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 570 | ret = PTR_ERR(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | goto cleanup_matches; |
| 572 | } |
| 573 | t->u.kernel.target = target; |
| 574 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 575 | ret = check_target(e, net, name); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 576 | if (ret) |
| 577 | goto err; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 578 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 580 | err: |
| 581 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | cleanup_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 583 | xt_ematch_foreach(ematch, e) { |
| 584 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 585 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 586 | cleanup_match(ematch, net); |
| 587 | } |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 588 | |
| 589 | xt_percpu_counter_free(e->counters.pcnt); |
| 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | return ret; |
| 592 | } |
| 593 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 594 | static bool check_underflow(const struct ipt_entry *e) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 595 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 596 | const struct xt_entry_target *t; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 597 | unsigned int verdict; |
| 598 | |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 599 | if (!unconditional(e)) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 600 | return false; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 601 | t = ipt_get_target_c(e); |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 602 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
| 603 | return false; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 604 | verdict = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 605 | verdict = -verdict - 1; |
| 606 | return verdict == NF_DROP || verdict == NF_ACCEPT; |
| 607 | } |
| 608 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 609 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | check_entry_size_and_hooks(struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 611 | struct xt_table_info *newinfo, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 612 | const unsigned char *base, |
| 613 | const unsigned char *limit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | const unsigned int *hook_entries, |
| 615 | const unsigned int *underflows, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 616 | unsigned int valid_hooks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | { |
| 618 | unsigned int h; |
Florian Westphal | bdf533d | 2016-03-22 18:02:49 +0100 | [diff] [blame] | 619 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 621 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
Florian Westphal | 6e94e0c | 2016-03-22 18:02:50 +0100 | [diff] [blame] | 622 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 623 | (unsigned char *)e + e->next_offset > limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
| 626 | if (e->next_offset |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 627 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Florian Westphal | aa412ba | 2016-04-01 14:17:24 +0200 | [diff] [blame] | 630 | if (!ip_checkentry(&e->ip)) |
| 631 | return -EINVAL; |
| 632 | |
Florian Westphal | ce683e5 | 2016-04-01 14:17:28 +0200 | [diff] [blame] | 633 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
| 634 | e->next_offset); |
Florian Westphal | bdf533d | 2016-03-22 18:02:49 +0100 | [diff] [blame] | 635 | if (err) |
| 636 | return err; |
| 637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 639 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Jan Engelhardt | a7d5173 | 2009-07-18 14:52:58 +0200 | [diff] [blame] | 640 | if (!(valid_hooks & (1 << h))) |
| 641 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | if ((unsigned char *)e - base == hook_entries[h]) |
| 643 | newinfo->hook_entry[h] = hook_entries[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 644 | if ((unsigned char *)e - base == underflows[h]) { |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 645 | if (!check_underflow(e)) |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 646 | return -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | newinfo->underflow[h] = underflows[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 649 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | } |
| 651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 653 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | e->comefrom = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | return 0; |
| 656 | } |
| 657 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 658 | static void |
| 659 | cleanup_entry(struct ipt_entry *e, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 661 | struct xt_tgdtor_param par; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 662 | struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 663 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 666 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 667 | cleanup_match(ematch, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | t = ipt_get_target(e); |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 669 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 670 | par.net = net; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 671 | par.target = t->u.kernel.target; |
| 672 | par.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 673 | par.family = NFPROTO_IPV4; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 674 | if (par.target->destroy != NULL) |
| 675 | par.target->destroy(&par); |
| 676 | module_put(par.target->me); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 677 | xt_percpu_counter_free(e->counters.pcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | /* Checks and translates the user-supplied table segment (held in |
| 681 | newinfo) */ |
| 682 | static int |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 683 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 684 | const struct ipt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 686 | struct ipt_entry *iter; |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 687 | unsigned int *offsets; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | unsigned int i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 689 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 691 | newinfo->size = repl->size; |
| 692 | newinfo->number = repl->num_entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
| 694 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 695 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 697 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 698 | } |
| 699 | |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 700 | offsets = xt_alloc_entry_offsets(newinfo->number); |
| 701 | if (!offsets) |
| 702 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | i = 0; |
| 704 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 705 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 706 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 707 | entry0 + repl->size, |
| 708 | repl->hook_entry, |
| 709 | repl->underflow, |
| 710 | repl->valid_hooks); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 711 | if (ret != 0) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 712 | goto out_free; |
| 713 | if (i < repl->num_entries) |
| 714 | offsets[i] = (void *)iter - entry0; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 715 | ++i; |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 716 | if (strcmp(ipt_get_target(iter)->u.user.name, |
| 717 | XT_ERROR_TARGET) == 0) |
| 718 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 719 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 721 | ret = -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 722 | if (i != repl->num_entries) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 723 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
| 725 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 726 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | /* Only hooks which are valid */ |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 728 | if (!(repl->valid_hooks & (1 << i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | continue; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 730 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 731 | goto out_free; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 732 | if (newinfo->underflow[i] == 0xFFFFFFFF) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 733 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 736 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
| 737 | ret = -ELOOP; |
| 738 | goto out_free; |
| 739 | } |
| 740 | kvfree(offsets); |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | /* Finally, each sanity check must pass */ |
| 743 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 744 | xt_entry_foreach(iter, entry0, newinfo->size) { |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 745 | ret = find_check_entry(iter, net, repl->name, repl->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 746 | if (ret != 0) |
| 747 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 748 | ++i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 749 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 751 | if (ret != 0) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 752 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 753 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 754 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 755 | cleanup_entry(iter, net); |
| 756 | } |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 757 | return ret; |
| 758 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | return ret; |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame^] | 761 | out_free: |
| 762 | kvfree(offsets); |
| 763 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
| 765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | static void |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 767 | get_counters(const struct xt_table_info *t, |
| 768 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 770 | struct ipt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | unsigned int cpu; |
| 772 | unsigned int i; |
| 773 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 774 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 775 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 776 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | i = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 778 | xt_entry_foreach(iter, t->entries, t->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 779 | struct xt_counters *tmp; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 780 | u64 bcnt, pcnt; |
| 781 | unsigned int start; |
| 782 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 783 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 784 | do { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 785 | start = read_seqcount_begin(s); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 786 | bcnt = tmp->bcnt; |
| 787 | pcnt = tmp->pcnt; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 788 | } while (read_seqcount_retry(s, start)); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 789 | |
| 790 | ADD_COUNTER(counters[i], bcnt, pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 791 | ++i; /* macro does multi eval of i */ |
| 792 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 794 | } |
| 795 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 796 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 798 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 799 | struct xt_counters *counters; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 800 | const struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
| 802 | /* We need atomic snapshot of counters: rest doesn't change |
| 803 | (other than comefrom, which userspace doesn't care |
| 804 | about). */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 805 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 806 | counters = vzalloc(countersize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
| 808 | if (counters == NULL) |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 809 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 811 | get_counters(private, counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 813 | return counters; |
| 814 | } |
| 815 | |
| 816 | static int |
| 817 | copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 818 | const struct xt_table *table, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 819 | void __user *userptr) |
| 820 | { |
| 821 | unsigned int off, num; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 822 | const struct ipt_entry *e; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 823 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 824 | const struct xt_table_info *private = table->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 825 | int ret = 0; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 826 | const void *loc_cpu_entry; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 827 | |
| 828 | counters = alloc_counters(table); |
| 829 | if (IS_ERR(counters)) |
| 830 | return PTR_ERR(counters); |
| 831 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 832 | loc_cpu_entry = private->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 833 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | ret = -EFAULT; |
| 835 | goto free_counters; |
| 836 | } |
| 837 | |
| 838 | /* FIXME: use iterator macros --RR */ |
| 839 | /* ... then go back and fix counters and names */ |
| 840 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 841 | unsigned int i; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 842 | const struct xt_entry_match *m; |
| 843 | const struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 845 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | if (copy_to_user(userptr + off |
| 847 | + offsetof(struct ipt_entry, counters), |
| 848 | &counters[num], |
| 849 | sizeof(counters[num])) != 0) { |
| 850 | ret = -EFAULT; |
| 851 | goto free_counters; |
| 852 | } |
| 853 | |
| 854 | for (i = sizeof(struct ipt_entry); |
| 855 | i < e->target_offset; |
| 856 | i += m->u.match_size) { |
| 857 | m = (void *)e + i; |
| 858 | |
| 859 | if (copy_to_user(userptr + off + i |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 860 | + offsetof(struct xt_entry_match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | u.user.name), |
| 862 | m->u.kernel.match->name, |
| 863 | strlen(m->u.kernel.match->name)+1) |
| 864 | != 0) { |
| 865 | ret = -EFAULT; |
| 866 | goto free_counters; |
| 867 | } |
| 868 | } |
| 869 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 870 | t = ipt_get_target_c(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | if (copy_to_user(userptr + off + e->target_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 872 | + offsetof(struct xt_entry_target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | u.user.name), |
| 874 | t->u.kernel.target->name, |
| 875 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 876 | ret = -EFAULT; |
| 877 | goto free_counters; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | free_counters: |
| 882 | vfree(counters); |
| 883 | return ret; |
| 884 | } |
| 885 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 886 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 887 | static void compat_standard_from_user(void *dst, const void *src) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 888 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 889 | int v = *(compat_int_t *)src; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 890 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 891 | if (v > 0) |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 892 | v += xt_compat_calc_jump(AF_INET, v); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 893 | memcpy(dst, &v, sizeof(v)); |
| 894 | } |
| 895 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 896 | static int compat_standard_to_user(void __user *dst, const void *src) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 897 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 898 | compat_int_t cv = *(int *)src; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 899 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 900 | if (cv > 0) |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 901 | cv -= xt_compat_calc_jump(AF_INET, cv); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 902 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 903 | } |
| 904 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 905 | static int compat_calc_entry(const struct ipt_entry *e, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 906 | const struct xt_table_info *info, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 907 | const void *base, struct xt_table_info *newinfo) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 908 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 909 | const struct xt_entry_match *ematch; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 910 | const struct xt_entry_target *t; |
Dmitry Mishin | e5b5ef7 | 2007-01-04 12:14:41 -0800 | [diff] [blame] | 911 | unsigned int entry_offset; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 912 | int off, i, ret; |
| 913 | |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 914 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 915 | entry_offset = (void *)e - base; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 916 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 917 | off += xt_compat_match_offset(ematch->u.kernel.match); |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 918 | t = ipt_get_target_c(e); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 919 | off += xt_compat_target_offset(t->u.kernel.target); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 920 | newinfo->size -= off; |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 921 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 922 | if (ret) |
| 923 | return ret; |
| 924 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 925 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 926 | if (info->hook_entry[i] && |
| 927 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 928 | newinfo->hook_entry[i] -= off; |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 929 | if (info->underflow[i] && |
| 930 | (e < (struct ipt_entry *)(base + info->underflow[i]))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 931 | newinfo->underflow[i] -= off; |
| 932 | } |
| 933 | return 0; |
| 934 | } |
| 935 | |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 936 | static int compat_table_info(const struct xt_table_info *info, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 937 | struct xt_table_info *newinfo) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 938 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 939 | struct ipt_entry *iter; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 940 | const void *loc_cpu_entry; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 941 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 942 | |
| 943 | if (!newinfo || !info) |
| 944 | return -EINVAL; |
| 945 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 946 | /* we dont care about newinfo->entries */ |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 947 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
| 948 | newinfo->initial_entries = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 949 | loc_cpu_entry = info->entries; |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 950 | xt_compat_init_offsets(AF_INET, info->number); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 951 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
| 952 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); |
| 953 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 954 | return ret; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 955 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 956 | return 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 957 | } |
| 958 | #endif |
| 959 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 960 | static int get_info(struct net *net, void __user *user, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 961 | const int *len, int compat) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 962 | { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 963 | char name[XT_TABLE_MAXNAMELEN]; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 964 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 965 | int ret; |
| 966 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 967 | if (*len != sizeof(struct ipt_getinfo)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 968 | return -EINVAL; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 969 | |
| 970 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 971 | return -EFAULT; |
| 972 | |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 973 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 974 | #ifdef CONFIG_COMPAT |
| 975 | if (compat) |
| 976 | xt_compat_lock(AF_INET); |
| 977 | #endif |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 978 | 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] | 979 | "iptable_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 980 | if (!IS_ERR_OR_NULL(t)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 981 | struct ipt_getinfo info; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 982 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 983 | #ifdef CONFIG_COMPAT |
Alexey Dobriyan | 14c7dbe | 2010-02-08 11:17:43 -0800 | [diff] [blame] | 984 | struct xt_table_info tmp; |
| 985 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 986 | if (compat) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 987 | ret = compat_table_info(private, &tmp); |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 988 | xt_compat_flush_offsets(AF_INET); |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 989 | private = &tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 990 | } |
| 991 | #endif |
Vasiliy Kulikov | b5f15ac | 2010-11-03 08:45:06 +0100 | [diff] [blame] | 992 | memset(&info, 0, sizeof(info)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 993 | info.valid_hooks = t->valid_hooks; |
| 994 | memcpy(info.hook_entry, private->hook_entry, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 995 | sizeof(info.hook_entry)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 996 | memcpy(info.underflow, private->underflow, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 997 | sizeof(info.underflow)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 998 | info.num_entries = private->number; |
| 999 | info.size = private->size; |
| 1000 | strcpy(info.name, name); |
| 1001 | |
| 1002 | if (copy_to_user(user, &info, *len) != 0) |
| 1003 | ret = -EFAULT; |
| 1004 | else |
| 1005 | ret = 0; |
| 1006 | |
| 1007 | xt_table_unlock(t); |
| 1008 | module_put(t->me); |
| 1009 | } else |
| 1010 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1011 | #ifdef CONFIG_COMPAT |
| 1012 | if (compat) |
| 1013 | xt_compat_unlock(AF_INET); |
| 1014 | #endif |
| 1015 | return ret; |
| 1016 | } |
| 1017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1019 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
| 1020 | const int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | { |
| 1022 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1023 | struct ipt_get_entries get; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1024 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1026 | if (*len < sizeof(get)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1027 | return -EINVAL; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1028 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1029 | return -EFAULT; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1030 | if (*len != sizeof(struct ipt_get_entries) + get.size) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1031 | return -EINVAL; |
Pablo Neira Ayuso | b301f25 | 2016-03-24 21:29:53 +0100 | [diff] [blame] | 1032 | get.name[sizeof(get.name) - 1] = '\0'; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1033 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1034 | t = xt_find_table_lock(net, AF_INET, get.name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1035 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1036 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1037 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1038 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | t, uptr->entrytable); |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1040 | else |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1041 | ret = -EAGAIN; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1044 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | } else |
| 1046 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1047 | |
| 1048 | return ret; |
| 1049 | } |
| 1050 | |
| 1051 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1052 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1053 | struct xt_table_info *newinfo, unsigned int num_counters, |
| 1054 | void __user *counters_ptr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1055 | { |
| 1056 | int ret; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1057 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1058 | struct xt_table_info *oldinfo; |
| 1059 | struct xt_counters *counters; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1060 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1061 | |
| 1062 | ret = 0; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 1063 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1064 | if (!counters) { |
| 1065 | ret = -ENOMEM; |
| 1066 | goto out; |
| 1067 | } |
| 1068 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1069 | 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] | 1070 | "iptable_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1071 | if (IS_ERR_OR_NULL(t)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1072 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1073 | goto free_newinfo_counters_untrans; |
| 1074 | } |
| 1075 | |
| 1076 | /* You lied! */ |
| 1077 | if (valid_hooks != t->valid_hooks) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1078 | ret = -EINVAL; |
| 1079 | goto put_module; |
| 1080 | } |
| 1081 | |
| 1082 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 1083 | if (!oldinfo) |
| 1084 | goto put_module; |
| 1085 | |
| 1086 | /* Update module usage count based on number of rules */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1087 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1088 | (newinfo->number <= oldinfo->initial_entries)) |
| 1089 | module_put(t->me); |
| 1090 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1091 | (newinfo->number <= oldinfo->initial_entries)) |
| 1092 | module_put(t->me); |
| 1093 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1094 | /* Get the old counters, and synchronize with replace */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1095 | get_counters(oldinfo, counters); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1096 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1097 | /* Decrease module usage counts and free resource */ |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1098 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1099 | cleanup_entry(iter, net); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1100 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1101 | xt_free_table_info(oldinfo); |
| 1102 | if (copy_to_user(counters_ptr, counters, |
Thomas Graf | c58dd2d | 2014-04-04 17:57:45 +0200 | [diff] [blame] | 1103 | sizeof(struct xt_counters) * num_counters) != 0) { |
| 1104 | /* Silent error, can't fail, new table is already in place */ |
| 1105 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); |
| 1106 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1107 | vfree(counters); |
| 1108 | xt_table_unlock(t); |
| 1109 | return ret; |
| 1110 | |
| 1111 | put_module: |
| 1112 | module_put(t->me); |
| 1113 | xt_table_unlock(t); |
| 1114 | free_newinfo_counters_untrans: |
| 1115 | vfree(counters); |
| 1116 | out: |
| 1117 | return ret; |
| 1118 | } |
| 1119 | |
| 1120 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1121 | do_replace(struct net *net, const void __user *user, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | { |
| 1123 | int ret; |
| 1124 | struct ipt_replace tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1125 | struct xt_table_info *newinfo; |
| 1126 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1127 | struct ipt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | |
| 1129 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1130 | return -EFAULT; |
| 1131 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1132 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1133 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1134 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1135 | if (tmp.num_counters == 0) |
| 1136 | return -EINVAL; |
| 1137 | |
Vasiliy Kulikov | 78b7987 | 2011-03-15 13:36:05 +0100 | [diff] [blame] | 1138 | tmp.name[sizeof(tmp.name)-1] = 0; |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1139 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1140 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | if (!newinfo) |
| 1142 | return -ENOMEM; |
| 1143 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1144 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1145 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | tmp.size) != 0) { |
| 1147 | ret = -EFAULT; |
| 1148 | goto free_newinfo; |
| 1149 | } |
| 1150 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 1151 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | if (ret != 0) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1153 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1155 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1156 | tmp.num_counters, tmp.counters); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1157 | if (ret) |
| 1158 | goto free_newinfo_untrans; |
| 1159 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1161 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1162 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1163 | cleanup_entry(iter, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1165 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | return ret; |
| 1167 | } |
| 1168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1170 | do_add_counters(struct net *net, const void __user *user, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 1171 | unsigned int len, int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | { |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1173 | unsigned int i; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1174 | struct xt_counters_info tmp; |
| 1175 | struct xt_counters *paddc; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1176 | struct xt_table *t; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1177 | const struct xt_table_info *private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | int ret = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1179 | struct ipt_entry *iter; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1180 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame] | 1182 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
| 1183 | if (IS_ERR(paddc)) |
| 1184 | return PTR_ERR(paddc); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1185 | |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame] | 1186 | t = xt_find_table_lock(net, AF_INET, tmp.name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1187 | if (IS_ERR_OR_NULL(t)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1189 | goto free; |
| 1190 | } |
| 1191 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1192 | local_bh_disable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1193 | private = t->private; |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame] | 1194 | if (private->number != tmp.num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | ret = -EINVAL; |
| 1196 | goto unlock_up_free; |
| 1197 | } |
| 1198 | |
| 1199 | i = 0; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1200 | addend = xt_write_recseq_begin(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1201 | xt_entry_foreach(iter, private->entries, private->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1202 | struct xt_counters *tmp; |
| 1203 | |
| 1204 | tmp = xt_get_this_cpu_counter(&iter->counters); |
| 1205 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1206 | ++i; |
| 1207 | } |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1208 | xt_write_recseq_end(addend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | unlock_up_free: |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1210 | local_bh_enable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1211 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | module_put(t->me); |
| 1213 | free: |
| 1214 | vfree(paddc); |
| 1215 | |
| 1216 | return ret; |
| 1217 | } |
| 1218 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1219 | #ifdef CONFIG_COMPAT |
| 1220 | struct compat_ipt_replace { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1221 | char name[XT_TABLE_MAXNAMELEN]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1222 | u32 valid_hooks; |
| 1223 | u32 num_entries; |
| 1224 | u32 size; |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1225 | u32 hook_entry[NF_INET_NUMHOOKS]; |
| 1226 | u32 underflow[NF_INET_NUMHOOKS]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1227 | u32 num_counters; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1228 | compat_uptr_t counters; /* struct xt_counters * */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1229 | struct compat_ipt_entry entries[0]; |
| 1230 | }; |
| 1231 | |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1232 | static int |
| 1233 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1234 | unsigned int *size, struct xt_counters *counters, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1235 | unsigned int i) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1236 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1237 | struct xt_entry_target *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1238 | struct compat_ipt_entry __user *ce; |
| 1239 | u_int16_t target_offset, next_offset; |
| 1240 | compat_uint_t origsize; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1241 | const struct xt_entry_match *ematch; |
| 1242 | int ret = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1243 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1244 | origsize = *size; |
| 1245 | ce = (struct compat_ipt_entry __user *)*dstptr; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1246 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
| 1247 | copy_to_user(&ce->counters, &counters[i], |
| 1248 | sizeof(counters[i])) != 0) |
| 1249 | return -EFAULT; |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1250 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1251 | *dstptr += sizeof(struct compat_ipt_entry); |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1252 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
| 1253 | |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1254 | xt_ematch_foreach(ematch, e) { |
| 1255 | ret = xt_compat_match_to_user(ematch, dstptr, size); |
| 1256 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1257 | return ret; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1258 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1259 | target_offset = e->target_offset - (origsize - *size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1260 | t = ipt_get_target(e); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1261 | ret = xt_compat_target_to_user(t, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1262 | if (ret) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1263 | return ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1264 | next_offset = e->next_offset - (origsize - *size); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1265 | if (put_user(target_offset, &ce->target_offset) != 0 || |
| 1266 | put_user(next_offset, &ce->next_offset) != 0) |
| 1267 | return -EFAULT; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1268 | return 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1269 | } |
| 1270 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1271 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1272 | compat_find_calc_match(struct xt_entry_match *m, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1273 | const struct ipt_ip *ip, |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1274 | int *size) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1275 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1276 | struct xt_match *match; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1277 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1278 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
| 1279 | m->u.user.revision); |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1280 | if (IS_ERR(match)) |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1281 | return PTR_ERR(match); |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1282 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1283 | m->u.kernel.match = match; |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1284 | *size += xt_compat_match_offset(match); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1285 | return 0; |
| 1286 | } |
| 1287 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1288 | static void compat_release_entry(struct compat_ipt_entry *e) |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1289 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1290 | struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1291 | struct xt_entry_match *ematch; |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1292 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1293 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1294 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1295 | module_put(ematch->u.kernel.match->me); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1296 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1297 | module_put(t->u.kernel.target->me); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1298 | } |
| 1299 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1300 | static int |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1301 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1302 | struct xt_table_info *newinfo, |
| 1303 | unsigned int *size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1304 | const unsigned char *base, |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1305 | const unsigned char *limit) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1306 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1307 | struct xt_entry_match *ematch; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1308 | struct xt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1309 | struct xt_target *target; |
Dmitry Mishin | e5b5ef7 | 2007-01-04 12:14:41 -0800 | [diff] [blame] | 1310 | unsigned int entry_offset; |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1311 | unsigned int j; |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1312 | int ret, off; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1313 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 1314 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
Florian Westphal | 6e94e0c | 2016-03-22 18:02:50 +0100 | [diff] [blame] | 1315 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1316 | (unsigned char *)e + e->next_offset > limit) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1317 | return -EINVAL; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1318 | |
| 1319 | if (e->next_offset < sizeof(struct compat_ipt_entry) + |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1320 | sizeof(struct compat_xt_entry_target)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1321 | return -EINVAL; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1322 | |
Florian Westphal | aa412ba | 2016-04-01 14:17:24 +0200 | [diff] [blame] | 1323 | if (!ip_checkentry(&e->ip)) |
| 1324 | return -EINVAL; |
| 1325 | |
Florian Westphal | ce683e5 | 2016-04-01 14:17:28 +0200 | [diff] [blame] | 1326 | ret = xt_compat_check_entry_offsets(e, e->elems, |
Florian Westphal | fc1221b | 2016-04-01 14:17:26 +0200 | [diff] [blame] | 1327 | e->target_offset, e->next_offset); |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 1328 | if (ret) |
| 1329 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 1330 | |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1331 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1332 | entry_offset = (void *)e - (void *)base; |
| 1333 | j = 0; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1334 | xt_ematch_foreach(ematch, e) { |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1335 | ret = compat_find_calc_match(ematch, &e->ip, &off); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1336 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1337 | goto release_matches; |
| 1338 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1339 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1340 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1341 | t = compat_ipt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1342 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
| 1343 | t->u.user.revision); |
| 1344 | if (IS_ERR(target)) { |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1345 | ret = PTR_ERR(target); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1346 | goto release_matches; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1347 | } |
| 1348 | t->u.kernel.target = target; |
| 1349 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1350 | off += xt_compat_target_offset(target); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1351 | *size += off; |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1352 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1353 | if (ret) |
| 1354 | goto out; |
| 1355 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1356 | return 0; |
Patrick McHardy | bec71b1 | 2006-09-20 12:04:08 -0700 | [diff] [blame] | 1357 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1358 | out: |
Patrick McHardy | bec71b1 | 2006-09-20 12:04:08 -0700 | [diff] [blame] | 1359 | module_put(t->u.kernel.target->me); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1360 | release_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1361 | xt_ematch_foreach(ematch, e) { |
| 1362 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1363 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1364 | module_put(ematch->u.kernel.match->me); |
| 1365 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1366 | return ret; |
| 1367 | } |
| 1368 | |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1369 | static void |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1370 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1371 | unsigned int *size, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1372 | struct xt_table_info *newinfo, unsigned char *base) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1373 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1374 | struct xt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1375 | struct xt_target *target; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1376 | struct ipt_entry *de; |
| 1377 | unsigned int origsize; |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1378 | int h; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1379 | struct xt_entry_match *ematch; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1380 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1381 | origsize = *size; |
| 1382 | de = (struct ipt_entry *)*dstptr; |
| 1383 | memcpy(de, e, sizeof(struct ipt_entry)); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1384 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1385 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1386 | *dstptr += sizeof(struct ipt_entry); |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1387 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
| 1388 | |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1389 | xt_ematch_foreach(ematch, e) |
| 1390 | xt_compat_match_from_user(ematch, dstptr, size); |
| 1391 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1392 | de->target_offset = e->target_offset - (origsize - *size); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1393 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1394 | target = t->u.kernel.target; |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1395 | xt_compat_target_from_user(t, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1396 | |
| 1397 | de->next_offset = e->next_offset - (origsize - *size); |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1398 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1399 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1400 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1401 | newinfo->hook_entry[h] -= origsize - *size; |
| 1402 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1403 | newinfo->underflow[h] -= origsize - *size; |
| 1404 | } |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1405 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1406 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1407 | static int |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 1408 | translate_compat_table(struct net *net, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1409 | struct xt_table_info **pinfo, |
| 1410 | void **pentry0, |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1411 | const struct compat_ipt_replace *compatr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1412 | { |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1413 | unsigned int i, j; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1414 | struct xt_table_info *newinfo, *info; |
| 1415 | void *pos, *entry0, *entry1; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1416 | struct compat_ipt_entry *iter0; |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1417 | struct ipt_replace repl; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1418 | unsigned int size; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1419 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1420 | |
| 1421 | info = *pinfo; |
| 1422 | entry0 = *pentry0; |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1423 | size = compatr->size; |
| 1424 | info->number = compatr->num_entries; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1425 | |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1426 | j = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1427 | xt_compat_lock(AF_INET); |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1428 | xt_compat_init_offsets(AF_INET, compatr->num_entries); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1429 | /* Walk through entries, checking offsets. */ |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1430 | xt_entry_foreach(iter0, entry0, compatr->size) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1431 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1432 | entry0, |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1433 | entry0 + compatr->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1434 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1435 | goto out_unlock; |
| 1436 | ++j; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1437 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1438 | |
| 1439 | ret = -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1440 | if (j != compatr->num_entries) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1441 | goto out_unlock; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1442 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1443 | ret = -ENOMEM; |
| 1444 | newinfo = xt_alloc_table_info(size); |
| 1445 | if (!newinfo) |
| 1446 | goto out_unlock; |
| 1447 | |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1448 | newinfo->number = compatr->num_entries; |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1449 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1450 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
| 1451 | newinfo->underflow[i] = compatr->underflow[i]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1452 | } |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1453 | entry1 = newinfo->entries; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1454 | pos = entry1; |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1455 | size = compatr->size; |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1456 | xt_entry_foreach(iter0, entry0, compatr->size) |
| 1457 | compat_copy_entry_from_user(iter0, &pos, &size, |
| 1458 | newinfo, entry1); |
| 1459 | |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1460 | /* all module references in entry0 are now gone. |
| 1461 | * entry1/newinfo contains a 64bit ruleset that looks exactly as |
| 1462 | * generated by 64bit userspace. |
| 1463 | * |
| 1464 | * Call standard translate_table() to validate all hook_entrys, |
| 1465 | * underflows, check for loops, etc. |
| 1466 | */ |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1467 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1468 | xt_compat_unlock(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1469 | |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1470 | memcpy(&repl, compatr, sizeof(*compatr)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1471 | |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1472 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1473 | repl.hook_entry[i] = newinfo->hook_entry[i]; |
| 1474 | repl.underflow[i] = newinfo->underflow[i]; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1475 | } |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1476 | |
| 1477 | repl.num_counters = 0; |
| 1478 | repl.counters = NULL; |
| 1479 | repl.size = newinfo->size; |
| 1480 | ret = translate_table(net, newinfo, entry1, &repl); |
| 1481 | if (ret) |
| 1482 | goto free_newinfo; |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1483 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1484 | *pinfo = newinfo; |
| 1485 | *pentry0 = entry1; |
| 1486 | xt_free_table_info(info); |
| 1487 | return 0; |
| 1488 | |
| 1489 | free_newinfo: |
| 1490 | xt_free_table_info(newinfo); |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1491 | return ret; |
| 1492 | out_unlock: |
| 1493 | xt_compat_flush_offsets(AF_INET); |
| 1494 | xt_compat_unlock(AF_INET); |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1495 | xt_entry_foreach(iter0, entry0, compatr->size) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1496 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1497 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1498 | compat_release_entry(iter0); |
| 1499 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1500 | return ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1501 | } |
| 1502 | |
| 1503 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1504 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1505 | { |
| 1506 | int ret; |
| 1507 | struct compat_ipt_replace tmp; |
| 1508 | struct xt_table_info *newinfo; |
| 1509 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1510 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1511 | |
| 1512 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1513 | return -EFAULT; |
| 1514 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1515 | /* overflow check */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1516 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1517 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1518 | if (tmp.num_counters == 0) |
| 1519 | return -EINVAL; |
| 1520 | |
Vasiliy Kulikov | 78b7987 | 2011-03-15 13:36:05 +0100 | [diff] [blame] | 1521 | tmp.name[sizeof(tmp.name)-1] = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1522 | |
| 1523 | newinfo = xt_alloc_table_info(tmp.size); |
| 1524 | if (!newinfo) |
| 1525 | return -ENOMEM; |
| 1526 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1527 | loc_cpu_entry = newinfo->entries; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1528 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
| 1529 | tmp.size) != 0) { |
| 1530 | ret = -EFAULT; |
| 1531 | goto free_newinfo; |
| 1532 | } |
| 1533 | |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1534 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1535 | if (ret != 0) |
| 1536 | goto free_newinfo; |
| 1537 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1538 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1539 | tmp.num_counters, compat_ptr(tmp.counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1540 | if (ret) |
| 1541 | goto free_newinfo_untrans; |
| 1542 | return 0; |
| 1543 | |
| 1544 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1545 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1546 | cleanup_entry(iter, net); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1547 | free_newinfo: |
| 1548 | xt_free_table_info(newinfo); |
| 1549 | return ret; |
| 1550 | } |
| 1551 | |
| 1552 | static int |
| 1553 | 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] | 1554 | unsigned int len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1555 | { |
| 1556 | int ret; |
| 1557 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1558 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1559 | return -EPERM; |
| 1560 | |
| 1561 | switch (cmd) { |
| 1562 | case IPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1563 | ret = compat_do_replace(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1564 | break; |
| 1565 | |
| 1566 | case IPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1567 | ret = do_add_counters(sock_net(sk), user, len, 1); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1568 | break; |
| 1569 | |
| 1570 | default: |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1571 | ret = -EINVAL; |
| 1572 | } |
| 1573 | |
| 1574 | return ret; |
| 1575 | } |
| 1576 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1577 | struct compat_ipt_get_entries { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1578 | char name[XT_TABLE_MAXNAMELEN]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1579 | compat_uint_t size; |
| 1580 | struct compat_ipt_entry entrytable[0]; |
| 1581 | }; |
| 1582 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1583 | static int |
| 1584 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, |
| 1585 | void __user *userptr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1586 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1587 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1588 | const struct xt_table_info *private = table->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1589 | void __user *pos; |
| 1590 | unsigned int size; |
| 1591 | int ret = 0; |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1592 | unsigned int i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1593 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1594 | |
| 1595 | counters = alloc_counters(table); |
| 1596 | if (IS_ERR(counters)) |
| 1597 | return PTR_ERR(counters); |
| 1598 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1599 | pos = userptr; |
| 1600 | size = total_size; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1601 | xt_entry_foreach(iter, private->entries, total_size) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1602 | ret = compat_copy_entry_to_user(iter, &pos, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1603 | &size, counters, i++); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1604 | if (ret != 0) |
| 1605 | break; |
| 1606 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1607 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1608 | vfree(counters); |
| 1609 | return ret; |
| 1610 | } |
| 1611 | |
| 1612 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1613 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
| 1614 | int *len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1615 | { |
| 1616 | int ret; |
| 1617 | struct compat_ipt_get_entries get; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1618 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1619 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1620 | if (*len < sizeof(get)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1621 | return -EINVAL; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1622 | |
| 1623 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1624 | return -EFAULT; |
| 1625 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1626 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1627 | return -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1628 | |
Pablo Neira Ayuso | b301f25 | 2016-03-24 21:29:53 +0100 | [diff] [blame] | 1629 | get.name[sizeof(get.name) - 1] = '\0'; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1630 | |
| 1631 | xt_compat_lock(AF_INET); |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1632 | t = xt_find_table_lock(net, AF_INET, get.name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1633 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1634 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1635 | struct xt_table_info info; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1636 | ret = compat_table_info(private, &info); |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1637 | if (!ret && get.size == info.size) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1638 | ret = compat_copy_entries_to_user(private->size, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1639 | t, uptr->entrytable); |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1640 | else if (!ret) |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1641 | ret = -EAGAIN; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1642 | |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1643 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1644 | module_put(t->me); |
| 1645 | xt_table_unlock(t); |
| 1646 | } else |
| 1647 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1648 | |
| 1649 | xt_compat_unlock(AF_INET); |
| 1650 | return ret; |
| 1651 | } |
| 1652 | |
Patrick McHardy | 79030ed | 2006-09-20 12:05:08 -0700 | [diff] [blame] | 1653 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
| 1654 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1655 | static int |
| 1656 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1657 | { |
| 1658 | int ret; |
| 1659 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1660 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Björn Steinbrink | 82fac05 | 2006-10-20 00:21:10 -0700 | [diff] [blame] | 1661 | return -EPERM; |
| 1662 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1663 | switch (cmd) { |
| 1664 | case IPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1665 | ret = get_info(sock_net(sk), user, len, 1); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1666 | break; |
| 1667 | case IPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1668 | ret = compat_get_entries(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1669 | break; |
| 1670 | default: |
Patrick McHardy | 79030ed | 2006-09-20 12:05:08 -0700 | [diff] [blame] | 1671 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1672 | } |
| 1673 | return ret; |
| 1674 | } |
| 1675 | #endif |
| 1676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | static int |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1678 | 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] | 1679 | { |
| 1680 | int ret; |
| 1681 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1682 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | return -EPERM; |
| 1684 | |
| 1685 | switch (cmd) { |
| 1686 | case IPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1687 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | break; |
| 1689 | |
| 1690 | case IPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1691 | ret = do_add_counters(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | break; |
| 1693 | |
| 1694 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | ret = -EINVAL; |
| 1696 | } |
| 1697 | |
| 1698 | return ret; |
| 1699 | } |
| 1700 | |
| 1701 | static int |
| 1702 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1703 | { |
| 1704 | int ret; |
| 1705 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1706 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | return -EPERM; |
| 1708 | |
| 1709 | switch (cmd) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1710 | case IPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1711 | ret = get_info(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | break; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1713 | |
| 1714 | case IPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1715 | ret = get_entries(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1716 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | |
| 1718 | case IPT_SO_GET_REVISION_MATCH: |
| 1719 | case IPT_SO_GET_REVISION_TARGET: { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1720 | struct xt_get_revision rev; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1721 | int target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | |
| 1723 | if (*len != sizeof(rev)) { |
| 1724 | ret = -EINVAL; |
| 1725 | break; |
| 1726 | } |
| 1727 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 1728 | ret = -EFAULT; |
| 1729 | break; |
| 1730 | } |
Vasiliy Kulikov | 78b7987 | 2011-03-15 13:36:05 +0100 | [diff] [blame] | 1731 | rev.name[sizeof(rev.name)-1] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | |
| 1733 | if (cmd == IPT_SO_GET_REVISION_TARGET) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1734 | target = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | else |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1736 | target = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1738 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
| 1739 | rev.revision, |
| 1740 | target, &ret), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | "ipt_%s", rev.name); |
| 1742 | break; |
| 1743 | } |
| 1744 | |
| 1745 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | ret = -EINVAL; |
| 1747 | } |
| 1748 | |
| 1749 | return ret; |
| 1750 | } |
| 1751 | |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1752 | static void __ipt_unregister_table(struct net *net, struct xt_table *table) |
| 1753 | { |
| 1754 | struct xt_table_info *private; |
| 1755 | void *loc_cpu_entry; |
| 1756 | struct module *table_owner = table->me; |
| 1757 | struct ipt_entry *iter; |
| 1758 | |
| 1759 | private = xt_unregister_table(table); |
| 1760 | |
| 1761 | /* Decrease module usage counts and free resources */ |
| 1762 | loc_cpu_entry = private->entries; |
| 1763 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
| 1764 | cleanup_entry(iter, net); |
| 1765 | if (private->number > private->initial_entries) |
| 1766 | module_put(table_owner); |
| 1767 | xt_free_table_info(private); |
| 1768 | } |
| 1769 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1770 | int ipt_register_table(struct net *net, const struct xt_table *table, |
| 1771 | const struct ipt_replace *repl, |
| 1772 | const struct nf_hook_ops *ops, struct xt_table **res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | { |
| 1774 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1775 | struct xt_table_info *newinfo; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 1776 | struct xt_table_info bootstrap = {0}; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1777 | void *loc_cpu_entry; |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 1778 | struct xt_table *new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1780 | newinfo = xt_alloc_table_info(repl->size); |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1781 | if (!newinfo) |
| 1782 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1784 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1785 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 1787 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1788 | if (ret != 0) |
| 1789 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1791 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 1792 | if (IS_ERR(new_table)) { |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1793 | ret = PTR_ERR(new_table); |
| 1794 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | } |
| 1796 | |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1797 | /* set res now, will see skbs right after nf_register_net_hooks */ |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1798 | WRITE_ONCE(*res, new_table); |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1799 | |
| 1800 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); |
| 1801 | if (ret != 0) { |
| 1802 | __ipt_unregister_table(net, new_table); |
| 1803 | *res = NULL; |
| 1804 | } |
| 1805 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1806 | return ret; |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1807 | |
| 1808 | out_free: |
| 1809 | xt_free_table_info(newinfo); |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1810 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | } |
| 1812 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1813 | void ipt_unregister_table(struct net *net, struct xt_table *table, |
| 1814 | const struct nf_hook_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | { |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1816 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
| 1817 | __ipt_unregister_table(net, table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | } |
| 1819 | |
| 1820 | /* 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] | 1821 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 1823 | u_int8_t type, u_int8_t code, |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1824 | bool invert) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | { |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1826 | return ((test_type == 0xFF) || |
| 1827 | (type == test_type && code >= min_code && code <= max_code)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | ^ invert; |
| 1829 | } |
| 1830 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1831 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 1832 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1834 | const struct icmphdr *ic; |
| 1835 | struct icmphdr _icmph; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1836 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | |
| 1838 | /* Must not be a fragment. */ |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1839 | if (par->fragoff != 0) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1840 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1842 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | if (ic == NULL) { |
| 1844 | /* We've been asked to examine this packet, and we |
| 1845 | * can't. Hence, no choice but to drop. |
| 1846 | */ |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 1847 | par->hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1848 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | } |
| 1850 | |
| 1851 | return icmp_type_code_match(icmpinfo->type, |
| 1852 | icmpinfo->code[0], |
| 1853 | icmpinfo->code[1], |
| 1854 | ic->type, ic->code, |
| 1855 | !!(icmpinfo->invflags&IPT_ICMP_INV)); |
| 1856 | } |
| 1857 | |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 1858 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1860 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 1862 | /* Must specify no unknown invflags */ |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 1863 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | } |
| 1865 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1866 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
| 1867 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 1868 | .name = XT_STANDARD_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1869 | .targetsize = sizeof(int), |
| 1870 | .family = NFPROTO_IPV4, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1871 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1872 | .compatsize = sizeof(compat_int_t), |
| 1873 | .compat_from_user = compat_standard_from_user, |
| 1874 | .compat_to_user = compat_standard_to_user, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1875 | #endif |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1876 | }, |
| 1877 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 1878 | .name = XT_ERROR_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1879 | .target = ipt_error, |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1880 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1881 | .family = NFPROTO_IPV4, |
| 1882 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | }; |
| 1884 | |
| 1885 | static struct nf_sockopt_ops ipt_sockopts = { |
| 1886 | .pf = PF_INET, |
| 1887 | .set_optmin = IPT_BASE_CTL, |
| 1888 | .set_optmax = IPT_SO_SET_MAX+1, |
| 1889 | .set = do_ipt_set_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1890 | #ifdef CONFIG_COMPAT |
| 1891 | .compat_set = compat_do_ipt_set_ctl, |
| 1892 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | .get_optmin = IPT_BASE_CTL, |
| 1894 | .get_optmax = IPT_SO_GET_MAX+1, |
| 1895 | .get = do_ipt_get_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1896 | #ifdef CONFIG_COMPAT |
| 1897 | .compat_get = compat_do_ipt_get_ctl, |
| 1898 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 1899 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | }; |
| 1901 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1902 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
| 1903 | { |
| 1904 | .name = "icmp", |
| 1905 | .match = icmp_match, |
| 1906 | .matchsize = sizeof(struct ipt_icmp), |
| 1907 | .checkentry = icmp_checkentry, |
| 1908 | .proto = IPPROTO_ICMP, |
| 1909 | .family = NFPROTO_IPV4, |
| 1910 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | }; |
| 1912 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1913 | static int __net_init ip_tables_net_init(struct net *net) |
| 1914 | { |
Jan Engelhardt | 383ca5b | 2009-04-14 14:24:21 +0200 | [diff] [blame] | 1915 | return xt_proto_init(net, NFPROTO_IPV4); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1916 | } |
| 1917 | |
| 1918 | static void __net_exit ip_tables_net_exit(struct net *net) |
| 1919 | { |
Jan Engelhardt | 383ca5b | 2009-04-14 14:24:21 +0200 | [diff] [blame] | 1920 | xt_proto_fini(net, NFPROTO_IPV4); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1921 | } |
| 1922 | |
| 1923 | static struct pernet_operations ip_tables_net_ops = { |
| 1924 | .init = ip_tables_net_init, |
| 1925 | .exit = ip_tables_net_exit, |
| 1926 | }; |
| 1927 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1928 | static int __init ip_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | { |
| 1930 | int ret; |
| 1931 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1932 | ret = register_pernet_subsys(&ip_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1933 | if (ret < 0) |
| 1934 | goto err1; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1935 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1936 | /* No one else will be downing sem now, so we won't sleep */ |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1937 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1938 | if (ret < 0) |
| 1939 | goto err2; |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1940 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1941 | if (ret < 0) |
| 1942 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | |
| 1944 | /* Register setsockopt */ |
| 1945 | ret = nf_register_sockopt(&ipt_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1946 | if (ret < 0) |
| 1947 | goto err5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 1949 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1951 | |
| 1952 | err5: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1953 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1954 | err4: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1955 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1956 | err2: |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1957 | unregister_pernet_subsys(&ip_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1958 | err1: |
| 1959 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | } |
| 1961 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1962 | static void __exit ip_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | { |
| 1964 | nf_unregister_sockopt(&ipt_sockopts); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1965 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1966 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
| 1967 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1968 | unregister_pernet_subsys(&ip_tables_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | } |
| 1970 | |
| 1971 | EXPORT_SYMBOL(ipt_register_table); |
| 1972 | EXPORT_SYMBOL(ipt_unregister_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | EXPORT_SYMBOL(ipt_do_table); |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1974 | module_init(ip_tables_init); |
| 1975 | module_exit(ip_tables_fini); |