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 | |
| 38 | /*#define DEBUG_IP_FIREWALL*/ |
| 39 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ |
| 40 | /*#define DEBUG_IP_FIREWALL_USER*/ |
| 41 | |
| 42 | #ifdef DEBUG_IP_FIREWALL |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 43 | #define dprintf(format, args...) pr_info(format , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #else |
| 45 | #define dprintf(format, args...) |
| 46 | #endif |
| 47 | |
| 48 | #ifdef DEBUG_IP_FIREWALL_USER |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 49 | #define duprintf(format, args...) pr_info(format , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #else |
| 51 | #define duprintf(format, args...) |
| 52 | #endif |
| 53 | |
| 54 | #ifdef CONFIG_NETFILTER_DEBUG |
Stephen Hemminger | af56760 | 2010-05-13 15:00:20 +0200 | [diff] [blame] | 55 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #else |
| 57 | #define IP_NF_ASSERT(x) |
| 58 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #if 0 |
| 61 | /* All the better to debug you with... */ |
| 62 | #define static |
| 63 | #define inline |
| 64 | #endif |
| 65 | |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 66 | void *ipt_alloc_initial_table(const struct xt_table *info) |
| 67 | { |
| 68 | return xt_alloc_initial_table(ipt, IPT); |
| 69 | } |
| 70 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | /* Returns whether matches rule or not. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 73 | /* Performance critical - called for every packet */ |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 74 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | ip_packet_match(const struct iphdr *ip, |
| 76 | const char *indev, |
| 77 | const char *outdev, |
| 78 | const struct ipt_ip *ipinfo, |
| 79 | int isfrag) |
| 80 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | unsigned long ret; |
| 82 | |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 83 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 86 | IPT_INV_SRCIP) || |
| 87 | FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, |
| 88 | IPT_INV_DSTIP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | dprintf("Source or dest mismatch.\n"); |
| 90 | |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 91 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
| 92 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 94 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
| 95 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 97 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 100 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
| 102 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { |
| 103 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 104 | indev, ipinfo->iniface, |
Ian Morris | 27951a0 | 2015-10-14 23:17:05 +0100 | [diff] [blame] | 105 | ipinfo->invflags & IPT_INV_VIA_IN ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 106 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 109 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { |
| 112 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 113 | outdev, ipinfo->outiface, |
Ian Morris | 27951a0 | 2015-10-14 23:17:05 +0100 | [diff] [blame] | 114 | ipinfo->invflags & IPT_INV_VIA_OUT ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 115 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | /* Check specific protocol */ |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 119 | if (ipinfo->proto && |
| 120 | FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
| 122 | ip->protocol, ipinfo->proto, |
Ian Morris | 27951a0 | 2015-10-14 23:17:05 +0100 | [diff] [blame] | 123 | ipinfo->invflags & IPT_INV_PROTO ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 124 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | /* If we have a fragment rule but the packet is not a fragment |
| 128 | * then we return zero */ |
| 129 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { |
| 130 | dprintf("Fragment rule but not fragment.%s\n", |
| 131 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 132 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
| 134 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 135 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 138 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | ip_checkentry(const struct ipt_ip *ip) |
| 140 | { |
| 141 | if (ip->flags & ~IPT_F_MASK) { |
| 142 | duprintf("Unknown flag bits set: %08X\n", |
| 143 | ip->flags & ~IPT_F_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 144 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
| 146 | if (ip->invflags & ~IPT_INV_MASK) { |
| 147 | duprintf("Unknown invflag bits set: %08X\n", |
| 148 | ip->invflags & ~IPT_INV_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 149 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 151 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 155 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 157 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | return NF_DROP; |
| 160 | } |
| 161 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 162 | /* Performance critical */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | static inline struct ipt_entry * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 164 | get_entry(const void *base, unsigned int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
| 166 | return (struct ipt_entry *)(base + offset); |
| 167 | } |
| 168 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 169 | /* All zeroes == unconditional rule. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 170 | /* Mildly perf critical (only if packet tracing is on) */ |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 171 | static inline bool unconditional(const struct ipt_entry *e) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 172 | { |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 173 | static const struct ipt_ip uncond; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 174 | |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 175 | return e->target_offset == sizeof(struct ipt_entry) && |
| 176 | memcmp(&e->ip, &uncond, sizeof(uncond)) == 0; |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 177 | #undef FWINV |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 178 | } |
| 179 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 180 | /* for const-correctness */ |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 181 | static inline const struct xt_entry_target * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 182 | ipt_get_target_c(const struct ipt_entry *e) |
| 183 | { |
| 184 | return ipt_get_target((struct ipt_entry *)e); |
| 185 | } |
| 186 | |
Gao feng | f016588 | 2013-03-21 19:48:42 +0000 | [diff] [blame] | 187 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 188 | static const char *const hooknames[] = { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 189 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
| 190 | [NF_INET_LOCAL_IN] = "INPUT", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 191 | [NF_INET_FORWARD] = "FORWARD", |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 192 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
| 193 | [NF_INET_POST_ROUTING] = "POSTROUTING", |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 194 | }; |
| 195 | |
| 196 | enum nf_ip_trace_comments { |
| 197 | NF_IP_TRACE_COMMENT_RULE, |
| 198 | NF_IP_TRACE_COMMENT_RETURN, |
| 199 | NF_IP_TRACE_COMMENT_POLICY, |
| 200 | }; |
| 201 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 202 | static const char *const comments[] = { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 203 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
| 204 | [NF_IP_TRACE_COMMENT_RETURN] = "return", |
| 205 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", |
| 206 | }; |
| 207 | |
| 208 | static struct nf_loginfo trace_loginfo = { |
| 209 | .type = NF_LOG_TYPE_LOG, |
| 210 | .u = { |
| 211 | .log = { |
| 212 | .level = 4, |
| 213 | .logflags = NF_LOG_MASK, |
| 214 | }, |
| 215 | }, |
| 216 | }; |
| 217 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 218 | /* Mildly perf critical (only if packet tracing is on) */ |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 219 | static inline int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 220 | 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] | 221 | const char *hookname, const char **chainname, |
| 222 | const char **comment, unsigned int *rulenum) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 223 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 224 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 225 | |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 226 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 227 | /* Head of user chain: ERROR target with chainname */ |
| 228 | *chainname = t->target.data; |
| 229 | (*rulenum) = 0; |
| 230 | } else if (s == e) { |
| 231 | (*rulenum)++; |
| 232 | |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 233 | if (unconditional(s) && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 234 | strcmp(t->target.u.kernel.target->name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 235 | XT_STANDARD_TARGET) == 0 && |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 236 | t->verdict < 0) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 237 | /* Tail of chains: STANDARD target (return/policy) */ |
| 238 | *comment = *chainname == hookname |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 239 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
| 240 | : comments[NF_IP_TRACE_COMMENT_RETURN]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 241 | } |
| 242 | return 1; |
| 243 | } else |
| 244 | (*rulenum)++; |
| 245 | |
| 246 | return 0; |
| 247 | } |
| 248 | |
Eric W. Biederman | 9dff2c9 | 2015-09-15 20:04:17 -0500 | [diff] [blame] | 249 | static void trace_packet(struct net *net, |
| 250 | const struct sk_buff *skb, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 251 | unsigned int hook, |
| 252 | const struct net_device *in, |
| 253 | const struct net_device *out, |
Jan Engelhardt | ecb6f85 | 2008-01-31 03:54:47 -0800 | [diff] [blame] | 254 | const char *tablename, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 255 | const struct xt_table_info *private, |
| 256 | const struct ipt_entry *e) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 257 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 258 | const struct ipt_entry *root; |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 259 | const char *hookname, *chainname, *comment; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 260 | const struct ipt_entry *iter; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 261 | unsigned int rulenum = 0; |
| 262 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 263 | root = get_entry(private->entries, private->hook_entry[hook]); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 264 | |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 265 | hookname = chainname = hooknames[hook]; |
| 266 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 267 | |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 268 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
| 269 | if (get_chainname_rulenum(iter, e, hookname, |
| 270 | &chainname, &comment, &rulenum) != 0) |
| 271 | break; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 272 | |
Pablo Neira Ayuso | 4017a7e | 2015-03-02 01:10:28 +0100 | [diff] [blame] | 273 | nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
| 274 | "TRACE: %s:%s:%s:%u ", |
| 275 | tablename, chainname, comment, rulenum); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 276 | } |
| 277 | #endif |
| 278 | |
Florian Westphal | 6c7941d | 2015-07-14 17:51:10 +0200 | [diff] [blame] | 279 | static inline |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 280 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) |
| 281 | { |
| 282 | return (void *)entry + entry->next_offset; |
| 283 | } |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 286 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 287 | ipt_do_table(struct sk_buff *skb, |
David S. Miller | 1c491ba | 2015-04-03 20:56:08 -0400 | [diff] [blame] | 288 | const struct nf_hook_state *state, |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 289 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | { |
Eric W. Biederman | 6cb8ff3f1 | 2015-09-18 14:32:55 -0500 | [diff] [blame] | 291 | unsigned int hook = state->hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 293 | const struct iphdr *ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 295 | unsigned int verdict = NF_DROP; |
| 296 | const char *indev, *outdev; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 297 | const void *table_base; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 298 | struct ipt_entry *e, **jumpstack; |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 299 | unsigned int stackidx, cpu; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 300 | const struct xt_table_info *private; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 301 | struct xt_action_param acpar; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 302 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
| 304 | /* Initialization */ |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 305 | stackidx = 0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 306 | ip = ip_hdr(skb); |
David S. Miller | 1c491ba | 2015-04-03 20:56:08 -0400 | [diff] [blame] | 307 | indev = state->in ? state->in->name : nulldevname; |
| 308 | outdev = state->out ? state->out->name : nulldevname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | /* We handle fragments by dealing with the first fragment as |
| 310 | * if it was a normal packet. All other fragments are treated |
| 311 | * normally, except that they will NEVER match rules that ask |
| 312 | * things we don't know, ie. tcp syn flag or ports). If the |
| 313 | * rule is also a fragment-specific rule, non-fragments won't |
| 314 | * match it. */ |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 315 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
| 316 | acpar.thoff = ip_hdrlen(skb); |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 317 | acpar.hotdrop = false; |
Eric W. Biederman | 156c196 | 2015-09-18 14:32:58 -0500 | [diff] [blame] | 318 | acpar.net = state->net; |
David S. Miller | 1c491ba | 2015-04-03 20:56:08 -0400 | [diff] [blame] | 319 | acpar.in = state->in; |
| 320 | acpar.out = state->out; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 321 | acpar.family = NFPROTO_IPV4; |
| 322 | acpar.hooknum = hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 325 | local_bh_disable(); |
| 326 | addend = xt_write_recseq_begin(); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 327 | private = table->private; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 328 | cpu = smp_processor_id(); |
Will Deacon | b416c14 | 2013-10-21 13:14:53 +0100 | [diff] [blame] | 329 | /* |
| 330 | * Ensure we load private-> members after we've fetched the base |
| 331 | * pointer. |
| 332 | */ |
| 333 | smp_read_barrier_depends(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 334 | table_base = private->entries; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 335 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 336 | |
| 337 | /* Switch to alternate jumpstack if we're being invoked via TEE. |
| 338 | * TEE issues XT_CONTINUE verdict on original skb so we must not |
| 339 | * clobber the jumpstack. |
| 340 | * |
| 341 | * For recursion via REJECT or SYNPROXY the stack will be clobbered |
| 342 | * but it is no problem since absolute verdict is issued by these. |
| 343 | */ |
Florian Westphal | dcebd31 | 2015-07-14 17:51:09 +0200 | [diff] [blame] | 344 | if (static_key_false(&xt_tee_enabled)) |
| 345 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 346 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 347 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 349 | pr_debug("Entering %s(hook %u), UF %p\n", |
| 350 | table->name, hook, |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 351 | get_entry(table_base, private->underflow[hook])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
| 353 | do { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 354 | const struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 355 | const struct xt_entry_match *ematch; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 356 | struct xt_counters *counter; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | IP_NF_ASSERT(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 359 | if (!ip_packet_match(ip, indev, outdev, |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 360 | &e->ip, acpar.fragoff)) { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 361 | no_match: |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 362 | e = ipt_next_entry(e); |
| 363 | continue; |
| 364 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame] | 366 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 367 | acpar.match = ematch->u.kernel.match; |
| 368 | acpar.matchinfo = ematch->data; |
| 369 | if (!acpar.match->match(skb, &acpar)) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 370 | goto no_match; |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame] | 371 | } |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 372 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 373 | counter = xt_get_this_cpu_counter(&e->counters); |
| 374 | ADD_COUNTER(*counter, skb->len, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 376 | t = ipt_get_target(e); |
| 377 | IP_NF_ASSERT(t->u.kernel.target); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 378 | |
Gao feng | f016588 | 2013-03-21 19:48:42 +0000 | [diff] [blame] | 379 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 380 | /* The packet is traced: log it */ |
| 381 | if (unlikely(skb->nf_trace)) |
Eric W. Biederman | 9dff2c9 | 2015-09-15 20:04:17 -0500 | [diff] [blame] | 382 | trace_packet(state->net, skb, hook, state->in, |
| 383 | state->out, table->name, private, e); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 384 | #endif |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 385 | /* Standard target? */ |
| 386 | if (!t->u.kernel.target->target) { |
| 387 | int v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 389 | v = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 390 | if (v < 0) { |
| 391 | /* Pop from stack? */ |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 392 | if (v != XT_RETURN) { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 393 | verdict = (unsigned int)(-v) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | break; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 395 | } |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 396 | if (stackidx == 0) { |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 397 | e = get_entry(table_base, |
| 398 | private->underflow[hook]); |
Patrick McHardy | cecc74d | 2010-04-22 13:03:24 +0200 | [diff] [blame] | 399 | pr_debug("Underflow (this is normal) " |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 400 | "to %p\n", e); |
| 401 | } else { |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 402 | e = jumpstack[--stackidx]; |
Patrick McHardy | cecc74d | 2010-04-22 13:03:24 +0200 | [diff] [blame] | 403 | pr_debug("Pulled %p out from pos %u\n", |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 404 | e, stackidx); |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 405 | e = ipt_next_entry(e); |
| 406 | } |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 407 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | } |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 409 | if (table_base + v != ipt_next_entry(e) && |
| 410 | !(e->ip.flags & IPT_F_GOTO)) { |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 411 | jumpstack[stackidx++] = e; |
Patrick McHardy | cecc74d | 2010-04-22 13:03:24 +0200 | [diff] [blame] | 412 | pr_debug("Pushed %p into pos %u\n", |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 413 | e, stackidx - 1); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 414 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 416 | e = get_entry(table_base, v); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 417 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 419 | |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 420 | acpar.target = t->u.kernel.target; |
| 421 | acpar.targinfo = t->data; |
Jan Engelhardt | bb70dfa | 2009-04-15 21:40:13 +0200 | [diff] [blame] | 422 | |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 423 | verdict = t->u.kernel.target->target(skb, &acpar); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 424 | /* Target might have changed stuff. */ |
| 425 | ip = ip_hdr(skb); |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 426 | if (verdict == XT_CONTINUE) |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 427 | e = ipt_next_entry(e); |
| 428 | else |
| 429 | /* Verdict */ |
| 430 | break; |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 431 | } while (!acpar.hotdrop); |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 432 | pr_debug("Exiting %s; sp at %u\n", __func__, stackidx); |
| 433 | |
Ian Morris | 24cebe3 | 2015-10-14 23:17:07 +0100 | [diff] [blame] | 434 | xt_write_recseq_end(addend); |
| 435 | local_bh_enable(); |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | #ifdef DEBUG_ALLOW_ALL |
| 438 | return NF_ACCEPT; |
| 439 | #else |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 440 | if (acpar.hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | return NF_DROP; |
| 442 | else return verdict; |
| 443 | #endif |
| 444 | } |
| 445 | |
Florian Westphal | 3647234 | 2016-04-01 14:17:22 +0200 | [diff] [blame] | 446 | static bool find_jump_target(const struct xt_table_info *t, |
| 447 | const struct ipt_entry *target) |
| 448 | { |
| 449 | struct ipt_entry *iter; |
| 450 | |
| 451 | xt_entry_foreach(iter, t->entries, t->size) { |
| 452 | if (iter == target) |
| 453 | return true; |
| 454 | } |
| 455 | return false; |
| 456 | } |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | /* 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] | 459 | there are loops. Puts hook bitmask in comefrom. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | static int |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 461 | mark_source_chains(const struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 462 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | { |
| 464 | unsigned int hook; |
| 465 | |
| 466 | /* No recursion; use packet counter to save back ptrs (reset |
| 467 | to 0 as we leave), and comefrom to save source hook bitmask */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 468 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | unsigned int pos = newinfo->hook_entry[hook]; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 470 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | if (!(valid_hooks & (1 << hook))) |
| 473 | continue; |
| 474 | |
| 475 | /* Set initial back pointer. */ |
| 476 | e->counters.pcnt = pos; |
| 477 | |
| 478 | for (;;) { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 479 | const struct xt_standard_target *t |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 480 | = (void *)ipt_get_target_c(e); |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 481 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 483 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 484 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | hook, pos, e->comefrom); |
| 486 | return 0; |
| 487 | } |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 488 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /* Unconditional return/END. */ |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 491 | if ((unconditional(e) && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 492 | (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 493 | XT_STANDARD_TARGET) == 0) && |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 494 | t->verdict < 0) || visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | unsigned int oldpos, size; |
| 496 | |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 497 | if ((strcmp(t->target.u.user.name, |
Ian Morris | 24cebe3 | 2015-10-14 23:17:07 +0100 | [diff] [blame] | 498 | XT_STANDARD_TARGET) == 0) && |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 499 | t->verdict < -NF_MAX_VERDICT - 1) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 500 | duprintf("mark_source_chains: bad " |
| 501 | "negative verdict (%i)\n", |
| 502 | t->verdict); |
| 503 | return 0; |
| 504 | } |
| 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | /* Return: backtrack through the last |
| 507 | big jump. */ |
| 508 | do { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 509 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | #ifdef DEBUG_IP_FIREWALL_USER |
| 511 | if (e->comefrom |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 512 | & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | duprintf("Back unset " |
| 514 | "on hook %u " |
| 515 | "rule %u\n", |
| 516 | hook, pos); |
| 517 | } |
| 518 | #endif |
| 519 | oldpos = pos; |
| 520 | pos = e->counters.pcnt; |
| 521 | e->counters.pcnt = 0; |
| 522 | |
| 523 | /* We're at the start. */ |
| 524 | if (pos == oldpos) |
| 525 | goto next; |
| 526 | |
| 527 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 528 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | } while (oldpos == pos + e->next_offset); |
| 530 | |
| 531 | /* Move along one */ |
| 532 | size = e->next_offset; |
| 533 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 534 | (entry0 + pos + size); |
Florian Westphal | f24e230 | 2016-04-01 14:17:21 +0200 | [diff] [blame] | 535 | if (pos + size >= newinfo->size) |
| 536 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | e->counters.pcnt = pos; |
| 538 | pos += size; |
| 539 | } else { |
| 540 | int newpos = t->verdict; |
| 541 | |
| 542 | if (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 543 | XT_STANDARD_TARGET) == 0 && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 544 | newpos >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | /* This a jump; chase it. */ |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 546 | duprintf("Jump rule %u -> %u\n", |
| 547 | pos, newpos); |
Florian Westphal | 3647234 | 2016-04-01 14:17:22 +0200 | [diff] [blame] | 548 | e = (struct ipt_entry *) |
| 549 | (entry0 + newpos); |
| 550 | if (!find_jump_target(newinfo, e)) |
| 551 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | } else { |
| 553 | /* ... this is a fallthru */ |
| 554 | newpos = pos + e->next_offset; |
Florian Westphal | f24e230 | 2016-04-01 14:17:21 +0200 | [diff] [blame] | 555 | if (newpos >= newinfo->size) |
| 556 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
| 558 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 559 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | e->counters.pcnt = pos; |
| 561 | pos = newpos; |
| 562 | } |
| 563 | } |
Ian Morris | 19f0a60 | 2015-10-14 23:17:04 +0100 | [diff] [blame] | 564 | next: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | duprintf("Finished chain %u\n", hook); |
| 566 | } |
| 567 | return 1; |
| 568 | } |
| 569 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 570 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | { |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 572 | struct xt_mtdtor_param par; |
| 573 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 574 | par.net = net; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 575 | par.match = m->u.kernel.match; |
| 576 | par.matchinfo = m->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 577 | par.family = NFPROTO_IPV4; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 578 | if (par.match->destroy != NULL) |
| 579 | par.match->destroy(&par); |
| 580 | module_put(par.match->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | } |
| 582 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 583 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 584 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 585 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 586 | const struct ipt_ip *ip = par->entryinfo; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 587 | int ret; |
| 588 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 589 | par->match = m->u.kernel.match; |
| 590 | par->matchinfo = m->data; |
| 591 | |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 592 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 593 | ip->proto, ip->invflags & IPT_INV_PROTO); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 594 | if (ret < 0) { |
Jan Engelhardt | b5cad0d | 2010-05-02 13:55:21 +0200 | [diff] [blame] | 595 | duprintf("check failed for `%s'.\n", par->match->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 596 | return ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 597 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 598 | return 0; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 599 | } |
| 600 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 601 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 602 | 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] | 603 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 604 | struct xt_match *match; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 605 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 607 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
| 608 | m->u.user.revision); |
| 609 | if (IS_ERR(match)) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 610 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 611 | return PTR_ERR(match); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | } |
| 613 | m->u.kernel.match = match; |
| 614 | |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 615 | ret = check_match(m, par); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 616 | if (ret) |
| 617 | goto err; |
| 618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 620 | err: |
| 621 | module_put(m->u.kernel.match->me); |
| 622 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } |
| 624 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 625 | 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] | 626 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 627 | struct xt_entry_target *t = ipt_get_target(e); |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 628 | struct xt_tgchk_param par = { |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 629 | .net = net, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 630 | .table = name, |
| 631 | .entryinfo = e, |
| 632 | .target = t->u.kernel.target, |
| 633 | .targinfo = t->data, |
| 634 | .hook_mask = e->comefrom, |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 635 | .family = NFPROTO_IPV4, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 636 | }; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 637 | int ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 638 | |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 639 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 640 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 641 | if (ret < 0) { |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 642 | duprintf("check failed for `%s'.\n", |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 643 | t->u.kernel.target->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 644 | return ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 645 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 646 | return 0; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 647 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 649 | static int |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 650 | 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] | 651 | unsigned int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 653 | struct xt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 654 | struct xt_target *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | int ret; |
| 656 | unsigned int j; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 657 | struct xt_mtchk_param mtpar; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 658 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 660 | e->counters.pcnt = xt_percpu_counter_alloc(); |
| 661 | if (IS_ERR_VALUE(e->counters.pcnt)) |
| 662 | return -ENOMEM; |
| 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | j = 0; |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 665 | mtpar.net = net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 666 | mtpar.table = name; |
| 667 | mtpar.entryinfo = &e->ip; |
| 668 | mtpar.hook_mask = e->comefrom; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 669 | mtpar.family = NFPROTO_IPV4; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 670 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 671 | ret = find_check_match(ematch, &mtpar); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 672 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 673 | goto cleanup_matches; |
| 674 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
| 677 | t = ipt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 678 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
| 679 | t->u.user.revision); |
| 680 | if (IS_ERR(target)) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 681 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 682 | ret = PTR_ERR(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | goto cleanup_matches; |
| 684 | } |
| 685 | t->u.kernel.target = target; |
| 686 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 687 | ret = check_target(e, net, name); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 688 | if (ret) |
| 689 | goto err; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 690 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 692 | err: |
| 693 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | cleanup_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 695 | xt_ematch_foreach(ematch, e) { |
| 696 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 697 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 698 | cleanup_match(ematch, net); |
| 699 | } |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 700 | |
| 701 | xt_percpu_counter_free(e->counters.pcnt); |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | return ret; |
| 704 | } |
| 705 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 706 | static bool check_underflow(const struct ipt_entry *e) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 707 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 708 | const struct xt_entry_target *t; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 709 | unsigned int verdict; |
| 710 | |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 711 | if (!unconditional(e)) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 712 | return false; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 713 | t = ipt_get_target_c(e); |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 714 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
| 715 | return false; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 716 | verdict = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 717 | verdict = -verdict - 1; |
| 718 | return verdict == NF_DROP || verdict == NF_ACCEPT; |
| 719 | } |
| 720 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 721 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | check_entry_size_and_hooks(struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 723 | struct xt_table_info *newinfo, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 724 | const unsigned char *base, |
| 725 | const unsigned char *limit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | const unsigned int *hook_entries, |
| 727 | const unsigned int *underflows, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 728 | unsigned int valid_hooks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | { |
| 730 | unsigned int h; |
Florian Westphal | bdf533d | 2016-03-22 18:02:49 +0100 | [diff] [blame] | 731 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 733 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
Florian Westphal | 6e94e0c | 2016-03-22 18:02:50 +0100 | [diff] [blame] | 734 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
| 735 | (unsigned char *)e + e->next_offset > limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | duprintf("Bad offset %p\n", e); |
| 737 | return -EINVAL; |
| 738 | } |
| 739 | |
| 740 | if (e->next_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 741 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | duprintf("checking: element %p size %u\n", |
| 743 | e, e->next_offset); |
| 744 | return -EINVAL; |
| 745 | } |
| 746 | |
Florian Westphal | aa412ba | 2016-04-01 14:17:24 +0200 | [diff] [blame] | 747 | if (!ip_checkentry(&e->ip)) |
| 748 | return -EINVAL; |
| 749 | |
Florian Westphal | ce683e5 | 2016-04-01 14:17:28 +0200 | [diff] [blame] | 750 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
| 751 | e->next_offset); |
Florian Westphal | bdf533d | 2016-03-22 18:02:49 +0100 | [diff] [blame] | 752 | if (err) |
| 753 | return err; |
| 754 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 756 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Jan Engelhardt | a7d5173 | 2009-07-18 14:52:58 +0200 | [diff] [blame] | 757 | if (!(valid_hooks & (1 << h))) |
| 758 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | if ((unsigned char *)e - base == hook_entries[h]) |
| 760 | newinfo->hook_entry[h] = hook_entries[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 761 | if ((unsigned char *)e - base == underflows[h]) { |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 762 | if (!check_underflow(e)) { |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 763 | pr_debug("Underflows must be unconditional and " |
| 764 | "use the STANDARD target with " |
| 765 | "ACCEPT/DROP\n"); |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 766 | return -EINVAL; |
| 767 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | newinfo->underflow[h] = underflows[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 769 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } |
| 771 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 773 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | e->comefrom = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | return 0; |
| 776 | } |
| 777 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 778 | static void |
| 779 | cleanup_entry(struct ipt_entry *e, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 781 | struct xt_tgdtor_param par; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 782 | struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 783 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 786 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 787 | cleanup_match(ematch, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | t = ipt_get_target(e); |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 789 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 790 | par.net = net; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 791 | par.target = t->u.kernel.target; |
| 792 | par.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 793 | par.family = NFPROTO_IPV4; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 794 | if (par.target->destroy != NULL) |
| 795 | par.target->destroy(&par); |
| 796 | module_put(par.target->me); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 797 | xt_percpu_counter_free(e->counters.pcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | /* Checks and translates the user-supplied table segment (held in |
| 801 | newinfo) */ |
| 802 | static int |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 803 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 804 | const struct ipt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 806 | struct ipt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | unsigned int i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 808 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 810 | newinfo->size = repl->size; |
| 811 | newinfo->number = repl->num_entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
| 813 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 814 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 816 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 817 | } |
| 818 | |
| 819 | duprintf("translate_table: size %u\n", newinfo->size); |
| 820 | i = 0; |
| 821 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 822 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 823 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 824 | entry0 + repl->size, |
| 825 | repl->hook_entry, |
| 826 | repl->underflow, |
| 827 | repl->valid_hooks); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 828 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 829 | return ret; |
| 830 | ++i; |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 831 | if (strcmp(ipt_get_target(iter)->u.user.name, |
| 832 | XT_ERROR_TARGET) == 0) |
| 833 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 834 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 836 | if (i != repl->num_entries) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | duprintf("translate_table: %u not %u entries\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 838 | i, repl->num_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | return -EINVAL; |
| 840 | } |
| 841 | |
| 842 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 843 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | /* Only hooks which are valid */ |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 845 | if (!(repl->valid_hooks & (1 << i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | continue; |
| 847 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 848 | duprintf("Invalid hook entry %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 849 | i, repl->hook_entry[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | return -EINVAL; |
| 851 | } |
| 852 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 853 | duprintf("Invalid underflow %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 854 | i, repl->underflow[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | return -EINVAL; |
| 856 | } |
| 857 | } |
| 858 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 859 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 860 | return -ELOOP; |
| 861 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | /* Finally, each sanity check must pass */ |
| 863 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 864 | xt_entry_foreach(iter, entry0, newinfo->size) { |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 865 | ret = find_check_entry(iter, net, repl->name, repl->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 866 | if (ret != 0) |
| 867 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 868 | ++i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 869 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 871 | if (ret != 0) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 872 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 873 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 874 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 875 | cleanup_entry(iter, net); |
| 876 | } |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 877 | return ret; |
| 878 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | return ret; |
| 881 | } |
| 882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | static void |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 884 | get_counters(const struct xt_table_info *t, |
| 885 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 887 | struct ipt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | unsigned int cpu; |
| 889 | unsigned int i; |
| 890 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 891 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 892 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | i = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 895 | xt_entry_foreach(iter, t->entries, t->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 896 | struct xt_counters *tmp; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 897 | u64 bcnt, pcnt; |
| 898 | unsigned int start; |
| 899 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 900 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 901 | do { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 902 | start = read_seqcount_begin(s); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 903 | bcnt = tmp->bcnt; |
| 904 | pcnt = tmp->pcnt; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 905 | } while (read_seqcount_retry(s, start)); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 906 | |
| 907 | ADD_COUNTER(counters[i], bcnt, pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 908 | ++i; /* macro does multi eval of i */ |
| 909 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | } |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 911 | } |
| 912 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 913 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 915 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 916 | struct xt_counters *counters; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 917 | const struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
| 919 | /* We need atomic snapshot of counters: rest doesn't change |
| 920 | (other than comefrom, which userspace doesn't care |
| 921 | about). */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 922 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 923 | counters = vzalloc(countersize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | if (counters == NULL) |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 926 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 928 | get_counters(private, counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 930 | return counters; |
| 931 | } |
| 932 | |
| 933 | static int |
| 934 | copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 935 | const struct xt_table *table, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 936 | void __user *userptr) |
| 937 | { |
| 938 | unsigned int off, num; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 939 | const struct ipt_entry *e; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 940 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 941 | const struct xt_table_info *private = table->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 942 | int ret = 0; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 943 | const void *loc_cpu_entry; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 944 | |
| 945 | counters = alloc_counters(table); |
| 946 | if (IS_ERR(counters)) |
| 947 | return PTR_ERR(counters); |
| 948 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 949 | loc_cpu_entry = private->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 950 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | ret = -EFAULT; |
| 952 | goto free_counters; |
| 953 | } |
| 954 | |
| 955 | /* FIXME: use iterator macros --RR */ |
| 956 | /* ... then go back and fix counters and names */ |
| 957 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 958 | unsigned int i; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 959 | const struct xt_entry_match *m; |
| 960 | const struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 962 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | if (copy_to_user(userptr + off |
| 964 | + offsetof(struct ipt_entry, counters), |
| 965 | &counters[num], |
| 966 | sizeof(counters[num])) != 0) { |
| 967 | ret = -EFAULT; |
| 968 | goto free_counters; |
| 969 | } |
| 970 | |
| 971 | for (i = sizeof(struct ipt_entry); |
| 972 | i < e->target_offset; |
| 973 | i += m->u.match_size) { |
| 974 | m = (void *)e + i; |
| 975 | |
| 976 | if (copy_to_user(userptr + off + i |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 977 | + offsetof(struct xt_entry_match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | u.user.name), |
| 979 | m->u.kernel.match->name, |
| 980 | strlen(m->u.kernel.match->name)+1) |
| 981 | != 0) { |
| 982 | ret = -EFAULT; |
| 983 | goto free_counters; |
| 984 | } |
| 985 | } |
| 986 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 987 | t = ipt_get_target_c(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | if (copy_to_user(userptr + off + e->target_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 989 | + offsetof(struct xt_entry_target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | u.user.name), |
| 991 | t->u.kernel.target->name, |
| 992 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 993 | ret = -EFAULT; |
| 994 | goto free_counters; |
| 995 | } |
| 996 | } |
| 997 | |
| 998 | free_counters: |
| 999 | vfree(counters); |
| 1000 | return ret; |
| 1001 | } |
| 1002 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1003 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 1004 | static void compat_standard_from_user(void *dst, const void *src) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1005 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1006 | int v = *(compat_int_t *)src; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1007 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1008 | if (v > 0) |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1009 | v += xt_compat_calc_jump(AF_INET, v); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1010 | memcpy(dst, &v, sizeof(v)); |
| 1011 | } |
| 1012 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 1013 | static int compat_standard_to_user(void __user *dst, const void *src) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1014 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1015 | compat_int_t cv = *(int *)src; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1016 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1017 | if (cv > 0) |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1018 | cv -= xt_compat_calc_jump(AF_INET, cv); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1019 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1020 | } |
| 1021 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1022 | static int compat_calc_entry(const struct ipt_entry *e, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1023 | const struct xt_table_info *info, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1024 | const void *base, struct xt_table_info *newinfo) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1025 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1026 | const struct xt_entry_match *ematch; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1027 | const struct xt_entry_target *t; |
Dmitry Mishin | e5b5ef7 | 2007-01-04 12:14:41 -0800 | [diff] [blame] | 1028 | unsigned int entry_offset; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1029 | int off, i, ret; |
| 1030 | |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1031 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1032 | entry_offset = (void *)e - base; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1033 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1034 | off += xt_compat_match_offset(ematch->u.kernel.match); |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1035 | t = ipt_get_target_c(e); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1036 | off += xt_compat_target_offset(t->u.kernel.target); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1037 | newinfo->size -= off; |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1038 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1039 | if (ret) |
| 1040 | return ret; |
| 1041 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1042 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1043 | if (info->hook_entry[i] && |
| 1044 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1045 | newinfo->hook_entry[i] -= off; |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1046 | if (info->underflow[i] && |
| 1047 | (e < (struct ipt_entry *)(base + info->underflow[i]))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1048 | newinfo->underflow[i] -= off; |
| 1049 | } |
| 1050 | return 0; |
| 1051 | } |
| 1052 | |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1053 | static int compat_table_info(const struct xt_table_info *info, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1054 | struct xt_table_info *newinfo) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1055 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1056 | struct ipt_entry *iter; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 1057 | const void *loc_cpu_entry; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1058 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1059 | |
| 1060 | if (!newinfo || !info) |
| 1061 | return -EINVAL; |
| 1062 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1063 | /* we dont care about newinfo->entries */ |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1064 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
| 1065 | newinfo->initial_entries = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1066 | loc_cpu_entry = info->entries; |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 1067 | xt_compat_init_offsets(AF_INET, info->number); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1068 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
| 1069 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); |
| 1070 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1071 | return ret; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1072 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1073 | return 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1074 | } |
| 1075 | #endif |
| 1076 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1077 | static int get_info(struct net *net, void __user *user, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 1078 | const int *len, int compat) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1079 | { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1080 | char name[XT_TABLE_MAXNAMELEN]; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1081 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1082 | int ret; |
| 1083 | |
| 1084 | if (*len != sizeof(struct ipt_getinfo)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1085 | duprintf("length %u != %zu\n", *len, |
| 1086 | sizeof(struct ipt_getinfo)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1087 | return -EINVAL; |
| 1088 | } |
| 1089 | |
| 1090 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 1091 | return -EFAULT; |
| 1092 | |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1093 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1094 | #ifdef CONFIG_COMPAT |
| 1095 | if (compat) |
| 1096 | xt_compat_lock(AF_INET); |
| 1097 | #endif |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1098 | 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] | 1099 | "iptable_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1100 | if (!IS_ERR_OR_NULL(t)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1101 | struct ipt_getinfo info; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1102 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1103 | #ifdef CONFIG_COMPAT |
Alexey Dobriyan | 14c7dbe | 2010-02-08 11:17:43 -0800 | [diff] [blame] | 1104 | struct xt_table_info tmp; |
| 1105 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1106 | if (compat) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1107 | ret = compat_table_info(private, &tmp); |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1108 | xt_compat_flush_offsets(AF_INET); |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1109 | private = &tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1110 | } |
| 1111 | #endif |
Vasiliy Kulikov | b5f15ac | 2010-11-03 08:45:06 +0100 | [diff] [blame] | 1112 | memset(&info, 0, sizeof(info)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1113 | info.valid_hooks = t->valid_hooks; |
| 1114 | memcpy(info.hook_entry, private->hook_entry, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1115 | sizeof(info.hook_entry)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1116 | memcpy(info.underflow, private->underflow, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1117 | sizeof(info.underflow)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1118 | info.num_entries = private->number; |
| 1119 | info.size = private->size; |
| 1120 | strcpy(info.name, name); |
| 1121 | |
| 1122 | if (copy_to_user(user, &info, *len) != 0) |
| 1123 | ret = -EFAULT; |
| 1124 | else |
| 1125 | ret = 0; |
| 1126 | |
| 1127 | xt_table_unlock(t); |
| 1128 | module_put(t->me); |
| 1129 | } else |
| 1130 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1131 | #ifdef CONFIG_COMPAT |
| 1132 | if (compat) |
| 1133 | xt_compat_unlock(AF_INET); |
| 1134 | #endif |
| 1135 | return ret; |
| 1136 | } |
| 1137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1139 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
| 1140 | const int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | { |
| 1142 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1143 | struct ipt_get_entries get; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1144 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1146 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1147 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1148 | return -EINVAL; |
| 1149 | } |
| 1150 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1151 | return -EFAULT; |
| 1152 | if (*len != sizeof(struct ipt_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1153 | duprintf("get_entries: %u != %zu\n", |
| 1154 | *len, sizeof(get) + get.size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1155 | return -EINVAL; |
| 1156 | } |
Pablo Neira Ayuso | b301f25 | 2016-03-24 21:29:53 +0100 | [diff] [blame] | 1157 | get.name[sizeof(get.name) - 1] = '\0'; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1158 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1159 | 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] | 1160 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1161 | const struct xt_table_info *private = t->private; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1162 | duprintf("t->private->number = %u\n", private->number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1163 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1164 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | t, uptr->entrytable); |
| 1166 | else { |
| 1167 | duprintf("get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1168 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1169 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | } |
| 1171 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1172 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } else |
| 1174 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1175 | |
| 1176 | return ret; |
| 1177 | } |
| 1178 | |
| 1179 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1180 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1181 | struct xt_table_info *newinfo, unsigned int num_counters, |
| 1182 | void __user *counters_ptr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1183 | { |
| 1184 | int ret; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1185 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1186 | struct xt_table_info *oldinfo; |
| 1187 | struct xt_counters *counters; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1188 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1189 | |
| 1190 | ret = 0; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 1191 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1192 | if (!counters) { |
| 1193 | ret = -ENOMEM; |
| 1194 | goto out; |
| 1195 | } |
| 1196 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1197 | 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] | 1198 | "iptable_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1199 | if (IS_ERR_OR_NULL(t)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1200 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1201 | goto free_newinfo_counters_untrans; |
| 1202 | } |
| 1203 | |
| 1204 | /* You lied! */ |
| 1205 | if (valid_hooks != t->valid_hooks) { |
| 1206 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1207 | valid_hooks, t->valid_hooks); |
| 1208 | ret = -EINVAL; |
| 1209 | goto put_module; |
| 1210 | } |
| 1211 | |
| 1212 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 1213 | if (!oldinfo) |
| 1214 | goto put_module; |
| 1215 | |
| 1216 | /* Update module usage count based on number of rules */ |
| 1217 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1218 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
| 1219 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1220 | (newinfo->number <= oldinfo->initial_entries)) |
| 1221 | module_put(t->me); |
| 1222 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1223 | (newinfo->number <= oldinfo->initial_entries)) |
| 1224 | module_put(t->me); |
| 1225 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1226 | /* Get the old counters, and synchronize with replace */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1227 | get_counters(oldinfo, counters); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1228 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1229 | /* Decrease module usage counts and free resource */ |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1230 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1231 | cleanup_entry(iter, net); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1232 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1233 | xt_free_table_info(oldinfo); |
| 1234 | if (copy_to_user(counters_ptr, counters, |
Thomas Graf | c58dd2d | 2014-04-04 17:57:45 +0200 | [diff] [blame] | 1235 | sizeof(struct xt_counters) * num_counters) != 0) { |
| 1236 | /* Silent error, can't fail, new table is already in place */ |
| 1237 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); |
| 1238 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1239 | vfree(counters); |
| 1240 | xt_table_unlock(t); |
| 1241 | return ret; |
| 1242 | |
| 1243 | put_module: |
| 1244 | module_put(t->me); |
| 1245 | xt_table_unlock(t); |
| 1246 | free_newinfo_counters_untrans: |
| 1247 | vfree(counters); |
| 1248 | out: |
| 1249 | return ret; |
| 1250 | } |
| 1251 | |
| 1252 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1253 | do_replace(struct net *net, const void __user *user, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | { |
| 1255 | int ret; |
| 1256 | struct ipt_replace tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1257 | struct xt_table_info *newinfo; |
| 1258 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1259 | struct ipt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | |
| 1261 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1262 | return -EFAULT; |
| 1263 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1264 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1265 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1266 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1267 | if (tmp.num_counters == 0) |
| 1268 | return -EINVAL; |
| 1269 | |
Vasiliy Kulikov | 78b7987 | 2011-03-15 13:36:05 +0100 | [diff] [blame] | 1270 | tmp.name[sizeof(tmp.name)-1] = 0; |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1271 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1272 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | if (!newinfo) |
| 1274 | return -ENOMEM; |
| 1275 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1276 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1277 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | tmp.size) != 0) { |
| 1279 | ret = -EFAULT; |
| 1280 | goto free_newinfo; |
| 1281 | } |
| 1282 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 1283 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | if (ret != 0) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1285 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 1287 | duprintf("Translated table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1289 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1290 | tmp.num_counters, tmp.counters); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1291 | if (ret) |
| 1292 | goto free_newinfo_untrans; |
| 1293 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1295 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1296 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1297 | cleanup_entry(iter, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1299 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | return ret; |
| 1301 | } |
| 1302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1304 | do_add_counters(struct net *net, const void __user *user, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 1305 | unsigned int len, int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | { |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1307 | unsigned int i; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1308 | struct xt_counters_info tmp; |
| 1309 | struct xt_counters *paddc; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1310 | struct xt_table *t; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1311 | const struct xt_table_info *private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | int ret = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1313 | struct ipt_entry *iter; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1314 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame^] | 1316 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
| 1317 | if (IS_ERR(paddc)) |
| 1318 | return PTR_ERR(paddc); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1319 | |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame^] | 1320 | 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] | 1321 | if (IS_ERR_OR_NULL(t)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1323 | goto free; |
| 1324 | } |
| 1325 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1326 | local_bh_disable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1327 | private = t->private; |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame^] | 1328 | if (private->number != tmp.num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | ret = -EINVAL; |
| 1330 | goto unlock_up_free; |
| 1331 | } |
| 1332 | |
| 1333 | i = 0; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1334 | addend = xt_write_recseq_begin(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1335 | xt_entry_foreach(iter, private->entries, private->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1336 | struct xt_counters *tmp; |
| 1337 | |
| 1338 | tmp = xt_get_this_cpu_counter(&iter->counters); |
| 1339 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1340 | ++i; |
| 1341 | } |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1342 | xt_write_recseq_end(addend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | unlock_up_free: |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1344 | local_bh_enable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1345 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | module_put(t->me); |
| 1347 | free: |
| 1348 | vfree(paddc); |
| 1349 | |
| 1350 | return ret; |
| 1351 | } |
| 1352 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1353 | #ifdef CONFIG_COMPAT |
| 1354 | struct compat_ipt_replace { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1355 | char name[XT_TABLE_MAXNAMELEN]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1356 | u32 valid_hooks; |
| 1357 | u32 num_entries; |
| 1358 | u32 size; |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1359 | u32 hook_entry[NF_INET_NUMHOOKS]; |
| 1360 | u32 underflow[NF_INET_NUMHOOKS]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1361 | u32 num_counters; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1362 | compat_uptr_t counters; /* struct xt_counters * */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1363 | struct compat_ipt_entry entries[0]; |
| 1364 | }; |
| 1365 | |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1366 | static int |
| 1367 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1368 | unsigned int *size, struct xt_counters *counters, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1369 | unsigned int i) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1370 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1371 | struct xt_entry_target *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1372 | struct compat_ipt_entry __user *ce; |
| 1373 | u_int16_t target_offset, next_offset; |
| 1374 | compat_uint_t origsize; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1375 | const struct xt_entry_match *ematch; |
| 1376 | int ret = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1377 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1378 | origsize = *size; |
| 1379 | ce = (struct compat_ipt_entry __user *)*dstptr; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1380 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
| 1381 | copy_to_user(&ce->counters, &counters[i], |
| 1382 | sizeof(counters[i])) != 0) |
| 1383 | return -EFAULT; |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1384 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1385 | *dstptr += sizeof(struct compat_ipt_entry); |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1386 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
| 1387 | |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1388 | xt_ematch_foreach(ematch, e) { |
| 1389 | ret = xt_compat_match_to_user(ematch, dstptr, size); |
| 1390 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1391 | return ret; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1392 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1393 | target_offset = e->target_offset - (origsize - *size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1394 | t = ipt_get_target(e); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1395 | ret = xt_compat_target_to_user(t, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1396 | if (ret) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1397 | return ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1398 | next_offset = e->next_offset - (origsize - *size); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1399 | if (put_user(target_offset, &ce->target_offset) != 0 || |
| 1400 | put_user(next_offset, &ce->next_offset) != 0) |
| 1401 | return -EFAULT; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1402 | return 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1403 | } |
| 1404 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1405 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1406 | compat_find_calc_match(struct xt_entry_match *m, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1407 | const struct ipt_ip *ip, |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1408 | int *size) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1409 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1410 | struct xt_match *match; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1411 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1412 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
| 1413 | m->u.user.revision); |
| 1414 | if (IS_ERR(match)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1415 | duprintf("compat_check_calc_match: `%s' not found\n", |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1416 | m->u.user.name); |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1417 | return PTR_ERR(match); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1418 | } |
| 1419 | m->u.kernel.match = match; |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1420 | *size += xt_compat_match_offset(match); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1421 | return 0; |
| 1422 | } |
| 1423 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1424 | static void compat_release_entry(struct compat_ipt_entry *e) |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1425 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1426 | struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1427 | struct xt_entry_match *ematch; |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1428 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1429 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1430 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1431 | module_put(ematch->u.kernel.match->me); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1432 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1433 | module_put(t->u.kernel.target->me); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1434 | } |
| 1435 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1436 | static int |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1437 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1438 | struct xt_table_info *newinfo, |
| 1439 | unsigned int *size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1440 | const unsigned char *base, |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1441 | const unsigned char *limit) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1442 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1443 | struct xt_entry_match *ematch; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1444 | struct xt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1445 | struct xt_target *target; |
Dmitry Mishin | e5b5ef7 | 2007-01-04 12:14:41 -0800 | [diff] [blame] | 1446 | unsigned int entry_offset; |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1447 | unsigned int j; |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1448 | int ret, off; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1449 | |
| 1450 | duprintf("check_compat_entry_size_and_hooks %p\n", e); |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 1451 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
Florian Westphal | 6e94e0c | 2016-03-22 18:02:50 +0100 | [diff] [blame] | 1452 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
| 1453 | (unsigned char *)e + e->next_offset > limit) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1454 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
| 1455 | return -EINVAL; |
| 1456 | } |
| 1457 | |
| 1458 | if (e->next_offset < sizeof(struct compat_ipt_entry) + |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1459 | sizeof(struct compat_xt_entry_target)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1460 | duprintf("checking: element %p size %u\n", |
| 1461 | e, e->next_offset); |
| 1462 | return -EINVAL; |
| 1463 | } |
| 1464 | |
Florian Westphal | aa412ba | 2016-04-01 14:17:24 +0200 | [diff] [blame] | 1465 | if (!ip_checkentry(&e->ip)) |
| 1466 | return -EINVAL; |
| 1467 | |
Florian Westphal | ce683e5 | 2016-04-01 14:17:28 +0200 | [diff] [blame] | 1468 | ret = xt_compat_check_entry_offsets(e, e->elems, |
Florian Westphal | fc1221b | 2016-04-01 14:17:26 +0200 | [diff] [blame] | 1469 | e->target_offset, e->next_offset); |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 1470 | if (ret) |
| 1471 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 1472 | |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1473 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1474 | entry_offset = (void *)e - (void *)base; |
| 1475 | j = 0; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1476 | xt_ematch_foreach(ematch, e) { |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1477 | ret = compat_find_calc_match(ematch, &e->ip, &off); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1478 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1479 | goto release_matches; |
| 1480 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1481 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1482 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1483 | t = compat_ipt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1484 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
| 1485 | t->u.user.revision); |
| 1486 | if (IS_ERR(target)) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 1487 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1488 | t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1489 | ret = PTR_ERR(target); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1490 | goto release_matches; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1491 | } |
| 1492 | t->u.kernel.target = target; |
| 1493 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1494 | off += xt_compat_target_offset(target); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1495 | *size += off; |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1496 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1497 | if (ret) |
| 1498 | goto out; |
| 1499 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1500 | return 0; |
Patrick McHardy | bec71b1 | 2006-09-20 12:04:08 -0700 | [diff] [blame] | 1501 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1502 | out: |
Patrick McHardy | bec71b1 | 2006-09-20 12:04:08 -0700 | [diff] [blame] | 1503 | module_put(t->u.kernel.target->me); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1504 | release_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1505 | xt_ematch_foreach(ematch, e) { |
| 1506 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1507 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1508 | module_put(ematch->u.kernel.match->me); |
| 1509 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1510 | return ret; |
| 1511 | } |
| 1512 | |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1513 | static void |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1514 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1515 | unsigned int *size, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1516 | struct xt_table_info *newinfo, unsigned char *base) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1517 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1518 | struct xt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1519 | struct xt_target *target; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1520 | struct ipt_entry *de; |
| 1521 | unsigned int origsize; |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1522 | int h; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1523 | struct xt_entry_match *ematch; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1524 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1525 | origsize = *size; |
| 1526 | de = (struct ipt_entry *)*dstptr; |
| 1527 | memcpy(de, e, sizeof(struct ipt_entry)); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1528 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1529 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1530 | *dstptr += sizeof(struct ipt_entry); |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1531 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
| 1532 | |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1533 | xt_ematch_foreach(ematch, e) |
| 1534 | xt_compat_match_from_user(ematch, dstptr, size); |
| 1535 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1536 | de->target_offset = e->target_offset - (origsize - *size); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1537 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1538 | target = t->u.kernel.target; |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1539 | xt_compat_target_from_user(t, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1540 | |
| 1541 | de->next_offset = e->next_offset - (origsize - *size); |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1542 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1543 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1544 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1545 | newinfo->hook_entry[h] -= origsize - *size; |
| 1546 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1547 | newinfo->underflow[h] -= origsize - *size; |
| 1548 | } |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1549 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1550 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1551 | static int |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 1552 | translate_compat_table(struct net *net, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1553 | struct xt_table_info **pinfo, |
| 1554 | void **pentry0, |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1555 | const struct compat_ipt_replace *compatr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1556 | { |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1557 | unsigned int i, j; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1558 | struct xt_table_info *newinfo, *info; |
| 1559 | void *pos, *entry0, *entry1; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1560 | struct compat_ipt_entry *iter0; |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1561 | struct ipt_replace repl; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1562 | unsigned int size; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1563 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1564 | |
| 1565 | info = *pinfo; |
| 1566 | entry0 = *pentry0; |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1567 | size = compatr->size; |
| 1568 | info->number = compatr->num_entries; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1569 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1570 | duprintf("translate_compat_table: size %u\n", info->size); |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1571 | j = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1572 | xt_compat_lock(AF_INET); |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1573 | xt_compat_init_offsets(AF_INET, compatr->num_entries); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1574 | /* Walk through entries, checking offsets. */ |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1575 | xt_entry_foreach(iter0, entry0, compatr->size) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1576 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1577 | entry0, |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1578 | entry0 + compatr->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1579 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1580 | goto out_unlock; |
| 1581 | ++j; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1582 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1583 | |
| 1584 | ret = -EINVAL; |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1585 | if (j != compatr->num_entries) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1586 | duprintf("translate_compat_table: %u not %u entries\n", |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1587 | j, compatr->num_entries); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1588 | goto out_unlock; |
| 1589 | } |
| 1590 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1591 | ret = -ENOMEM; |
| 1592 | newinfo = xt_alloc_table_info(size); |
| 1593 | if (!newinfo) |
| 1594 | goto out_unlock; |
| 1595 | |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1596 | newinfo->number = compatr->num_entries; |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1597 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1598 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
| 1599 | newinfo->underflow[i] = compatr->underflow[i]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1600 | } |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1601 | entry1 = newinfo->entries; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1602 | pos = entry1; |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1603 | size = compatr->size; |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1604 | xt_entry_foreach(iter0, entry0, compatr->size) |
| 1605 | compat_copy_entry_from_user(iter0, &pos, &size, |
| 1606 | newinfo, entry1); |
| 1607 | |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1608 | /* all module references in entry0 are now gone. |
| 1609 | * entry1/newinfo contains a 64bit ruleset that looks exactly as |
| 1610 | * generated by 64bit userspace. |
| 1611 | * |
| 1612 | * Call standard translate_table() to validate all hook_entrys, |
| 1613 | * underflows, check for loops, etc. |
| 1614 | */ |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1615 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1616 | xt_compat_unlock(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1617 | |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1618 | memcpy(&repl, compatr, sizeof(*compatr)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1619 | |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1620 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1621 | repl.hook_entry[i] = newinfo->hook_entry[i]; |
| 1622 | repl.underflow[i] = newinfo->underflow[i]; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1623 | } |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1624 | |
| 1625 | repl.num_counters = 0; |
| 1626 | repl.counters = NULL; |
| 1627 | repl.size = newinfo->size; |
| 1628 | ret = translate_table(net, newinfo, entry1, &repl); |
| 1629 | if (ret) |
| 1630 | goto free_newinfo; |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1631 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1632 | *pinfo = newinfo; |
| 1633 | *pentry0 = entry1; |
| 1634 | xt_free_table_info(info); |
| 1635 | return 0; |
| 1636 | |
| 1637 | free_newinfo: |
| 1638 | xt_free_table_info(newinfo); |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1639 | return ret; |
| 1640 | out_unlock: |
| 1641 | xt_compat_flush_offsets(AF_INET); |
| 1642 | xt_compat_unlock(AF_INET); |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1643 | xt_entry_foreach(iter0, entry0, compatr->size) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1644 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1645 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1646 | compat_release_entry(iter0); |
| 1647 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1648 | return ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1649 | } |
| 1650 | |
| 1651 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1652 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1653 | { |
| 1654 | int ret; |
| 1655 | struct compat_ipt_replace tmp; |
| 1656 | struct xt_table_info *newinfo; |
| 1657 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1658 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1659 | |
| 1660 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1661 | return -EFAULT; |
| 1662 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1663 | /* overflow check */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1664 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1665 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1666 | if (tmp.num_counters == 0) |
| 1667 | return -EINVAL; |
| 1668 | |
Vasiliy Kulikov | 78b7987 | 2011-03-15 13:36:05 +0100 | [diff] [blame] | 1669 | tmp.name[sizeof(tmp.name)-1] = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1670 | |
| 1671 | newinfo = xt_alloc_table_info(tmp.size); |
| 1672 | if (!newinfo) |
| 1673 | return -ENOMEM; |
| 1674 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1675 | loc_cpu_entry = newinfo->entries; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1676 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
| 1677 | tmp.size) != 0) { |
| 1678 | ret = -EFAULT; |
| 1679 | goto free_newinfo; |
| 1680 | } |
| 1681 | |
Florian Westphal | 7d3f843 | 2016-04-01 14:17:30 +0200 | [diff] [blame] | 1682 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1683 | if (ret != 0) |
| 1684 | goto free_newinfo; |
| 1685 | |
| 1686 | duprintf("compat_do_replace: Translated table\n"); |
| 1687 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1688 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1689 | tmp.num_counters, compat_ptr(tmp.counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1690 | if (ret) |
| 1691 | goto free_newinfo_untrans; |
| 1692 | return 0; |
| 1693 | |
| 1694 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1695 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1696 | cleanup_entry(iter, net); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1697 | free_newinfo: |
| 1698 | xt_free_table_info(newinfo); |
| 1699 | return ret; |
| 1700 | } |
| 1701 | |
| 1702 | static int |
| 1703 | 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] | 1704 | unsigned int len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1705 | { |
| 1706 | int ret; |
| 1707 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1708 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1709 | return -EPERM; |
| 1710 | |
| 1711 | switch (cmd) { |
| 1712 | case IPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1713 | ret = compat_do_replace(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1714 | break; |
| 1715 | |
| 1716 | case IPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1717 | ret = do_add_counters(sock_net(sk), user, len, 1); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1718 | break; |
| 1719 | |
| 1720 | default: |
| 1721 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); |
| 1722 | ret = -EINVAL; |
| 1723 | } |
| 1724 | |
| 1725 | return ret; |
| 1726 | } |
| 1727 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1728 | struct compat_ipt_get_entries { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1729 | char name[XT_TABLE_MAXNAMELEN]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1730 | compat_uint_t size; |
| 1731 | struct compat_ipt_entry entrytable[0]; |
| 1732 | }; |
| 1733 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1734 | static int |
| 1735 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, |
| 1736 | void __user *userptr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1737 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1738 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1739 | const struct xt_table_info *private = table->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1740 | void __user *pos; |
| 1741 | unsigned int size; |
| 1742 | int ret = 0; |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1743 | unsigned int i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1744 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1745 | |
| 1746 | counters = alloc_counters(table); |
| 1747 | if (IS_ERR(counters)) |
| 1748 | return PTR_ERR(counters); |
| 1749 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1750 | pos = userptr; |
| 1751 | size = total_size; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1752 | xt_entry_foreach(iter, private->entries, total_size) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1753 | ret = compat_copy_entry_to_user(iter, &pos, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1754 | &size, counters, i++); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1755 | if (ret != 0) |
| 1756 | break; |
| 1757 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1758 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1759 | vfree(counters); |
| 1760 | return ret; |
| 1761 | } |
| 1762 | |
| 1763 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1764 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
| 1765 | int *len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1766 | { |
| 1767 | int ret; |
| 1768 | struct compat_ipt_get_entries get; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1769 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1770 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1771 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1772 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1773 | return -EINVAL; |
| 1774 | } |
| 1775 | |
| 1776 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1777 | return -EFAULT; |
| 1778 | |
| 1779 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1780 | duprintf("compat_get_entries: %u != %zu\n", |
| 1781 | *len, sizeof(get) + get.size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1782 | return -EINVAL; |
| 1783 | } |
Pablo Neira Ayuso | b301f25 | 2016-03-24 21:29:53 +0100 | [diff] [blame] | 1784 | get.name[sizeof(get.name) - 1] = '\0'; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1785 | |
| 1786 | xt_compat_lock(AF_INET); |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1787 | 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] | 1788 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1789 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1790 | struct xt_table_info info; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1791 | duprintf("t->private->number = %u\n", private->number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1792 | ret = compat_table_info(private, &info); |
| 1793 | if (!ret && get.size == info.size) { |
| 1794 | ret = compat_copy_entries_to_user(private->size, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1795 | t, uptr->entrytable); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1796 | } else if (!ret) { |
| 1797 | duprintf("compat_get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1798 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1799 | ret = -EAGAIN; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1800 | } |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1801 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1802 | module_put(t->me); |
| 1803 | xt_table_unlock(t); |
| 1804 | } else |
| 1805 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1806 | |
| 1807 | xt_compat_unlock(AF_INET); |
| 1808 | return ret; |
| 1809 | } |
| 1810 | |
Patrick McHardy | 79030ed | 2006-09-20 12:05:08 -0700 | [diff] [blame] | 1811 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
| 1812 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1813 | static int |
| 1814 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1815 | { |
| 1816 | int ret; |
| 1817 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1818 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Björn Steinbrink | 82fac05 | 2006-10-20 00:21:10 -0700 | [diff] [blame] | 1819 | return -EPERM; |
| 1820 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1821 | switch (cmd) { |
| 1822 | case IPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1823 | ret = get_info(sock_net(sk), user, len, 1); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1824 | break; |
| 1825 | case IPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1826 | ret = compat_get_entries(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1827 | break; |
| 1828 | default: |
Patrick McHardy | 79030ed | 2006-09-20 12:05:08 -0700 | [diff] [blame] | 1829 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1830 | } |
| 1831 | return ret; |
| 1832 | } |
| 1833 | #endif |
| 1834 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | static int |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1836 | 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] | 1837 | { |
| 1838 | int ret; |
| 1839 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1840 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | return -EPERM; |
| 1842 | |
| 1843 | switch (cmd) { |
| 1844 | case IPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1845 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | break; |
| 1847 | |
| 1848 | case IPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1849 | ret = do_add_counters(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | break; |
| 1851 | |
| 1852 | default: |
| 1853 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); |
| 1854 | ret = -EINVAL; |
| 1855 | } |
| 1856 | |
| 1857 | return ret; |
| 1858 | } |
| 1859 | |
| 1860 | static int |
| 1861 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1862 | { |
| 1863 | int ret; |
| 1864 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1865 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | return -EPERM; |
| 1867 | |
| 1868 | switch (cmd) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1869 | case IPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1870 | ret = get_info(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1871 | break; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1872 | |
| 1873 | case IPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1874 | ret = get_entries(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1875 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | |
| 1877 | case IPT_SO_GET_REVISION_MATCH: |
| 1878 | case IPT_SO_GET_REVISION_TARGET: { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1879 | struct xt_get_revision rev; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1880 | int target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | |
| 1882 | if (*len != sizeof(rev)) { |
| 1883 | ret = -EINVAL; |
| 1884 | break; |
| 1885 | } |
| 1886 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 1887 | ret = -EFAULT; |
| 1888 | break; |
| 1889 | } |
Vasiliy Kulikov | 78b7987 | 2011-03-15 13:36:05 +0100 | [diff] [blame] | 1890 | rev.name[sizeof(rev.name)-1] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | |
| 1892 | if (cmd == IPT_SO_GET_REVISION_TARGET) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1893 | target = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | else |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1895 | target = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1897 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
| 1898 | rev.revision, |
| 1899 | target, &ret), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | "ipt_%s", rev.name); |
| 1901 | break; |
| 1902 | } |
| 1903 | |
| 1904 | default: |
| 1905 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); |
| 1906 | ret = -EINVAL; |
| 1907 | } |
| 1908 | |
| 1909 | return ret; |
| 1910 | } |
| 1911 | |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1912 | static void __ipt_unregister_table(struct net *net, struct xt_table *table) |
| 1913 | { |
| 1914 | struct xt_table_info *private; |
| 1915 | void *loc_cpu_entry; |
| 1916 | struct module *table_owner = table->me; |
| 1917 | struct ipt_entry *iter; |
| 1918 | |
| 1919 | private = xt_unregister_table(table); |
| 1920 | |
| 1921 | /* Decrease module usage counts and free resources */ |
| 1922 | loc_cpu_entry = private->entries; |
| 1923 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
| 1924 | cleanup_entry(iter, net); |
| 1925 | if (private->number > private->initial_entries) |
| 1926 | module_put(table_owner); |
| 1927 | xt_free_table_info(private); |
| 1928 | } |
| 1929 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1930 | int ipt_register_table(struct net *net, const struct xt_table *table, |
| 1931 | const struct ipt_replace *repl, |
| 1932 | const struct nf_hook_ops *ops, struct xt_table **res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | { |
| 1934 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1935 | struct xt_table_info *newinfo; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 1936 | struct xt_table_info bootstrap = {0}; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1937 | void *loc_cpu_entry; |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 1938 | struct xt_table *new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1940 | newinfo = xt_alloc_table_info(repl->size); |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1941 | if (!newinfo) |
| 1942 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1944 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1945 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 1947 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1948 | if (ret != 0) |
| 1949 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1951 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 1952 | if (IS_ERR(new_table)) { |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1953 | ret = PTR_ERR(new_table); |
| 1954 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | } |
| 1956 | |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1957 | /* set res now, will see skbs right after nf_register_net_hooks */ |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1958 | WRITE_ONCE(*res, new_table); |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1959 | |
| 1960 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); |
| 1961 | if (ret != 0) { |
| 1962 | __ipt_unregister_table(net, new_table); |
| 1963 | *res = NULL; |
| 1964 | } |
| 1965 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1966 | return ret; |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1967 | |
| 1968 | out_free: |
| 1969 | xt_free_table_info(newinfo); |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1970 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | } |
| 1972 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1973 | void ipt_unregister_table(struct net *net, struct xt_table *table, |
| 1974 | const struct nf_hook_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | { |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1976 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
| 1977 | __ipt_unregister_table(net, table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | } |
| 1979 | |
| 1980 | /* 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] | 1981 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 1983 | u_int8_t type, u_int8_t code, |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1984 | bool invert) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | { |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1986 | return ((test_type == 0xFF) || |
| 1987 | (type == test_type && code >= min_code && code <= max_code)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | ^ invert; |
| 1989 | } |
| 1990 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1991 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 1992 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1994 | const struct icmphdr *ic; |
| 1995 | struct icmphdr _icmph; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1996 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | |
| 1998 | /* Must not be a fragment. */ |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1999 | if (par->fragoff != 0) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2000 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2002 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | if (ic == NULL) { |
| 2004 | /* We've been asked to examine this packet, and we |
| 2005 | * can't. Hence, no choice but to drop. |
| 2006 | */ |
| 2007 | duprintf("Dropping evil ICMP tinygram.\n"); |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 2008 | par->hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2009 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | } |
| 2011 | |
| 2012 | return icmp_type_code_match(icmpinfo->type, |
| 2013 | icmpinfo->code[0], |
| 2014 | icmpinfo->code[1], |
| 2015 | ic->type, ic->code, |
| 2016 | !!(icmpinfo->invflags&IPT_ICMP_INV)); |
| 2017 | } |
| 2018 | |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 2019 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2021 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2023 | /* Must specify no unknown invflags */ |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 2024 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | } |
| 2026 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2027 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
| 2028 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 2029 | .name = XT_STANDARD_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2030 | .targetsize = sizeof(int), |
| 2031 | .family = NFPROTO_IPV4, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2032 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2033 | .compatsize = sizeof(compat_int_t), |
| 2034 | .compat_from_user = compat_standard_from_user, |
| 2035 | .compat_to_user = compat_standard_to_user, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2036 | #endif |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2037 | }, |
| 2038 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 2039 | .name = XT_ERROR_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2040 | .target = ipt_error, |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 2041 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2042 | .family = NFPROTO_IPV4, |
| 2043 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | }; |
| 2045 | |
| 2046 | static struct nf_sockopt_ops ipt_sockopts = { |
| 2047 | .pf = PF_INET, |
| 2048 | .set_optmin = IPT_BASE_CTL, |
| 2049 | .set_optmax = IPT_SO_SET_MAX+1, |
| 2050 | .set = do_ipt_set_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2051 | #ifdef CONFIG_COMPAT |
| 2052 | .compat_set = compat_do_ipt_set_ctl, |
| 2053 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | .get_optmin = IPT_BASE_CTL, |
| 2055 | .get_optmax = IPT_SO_GET_MAX+1, |
| 2056 | .get = do_ipt_get_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2057 | #ifdef CONFIG_COMPAT |
| 2058 | .compat_get = compat_do_ipt_get_ctl, |
| 2059 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 2060 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | }; |
| 2062 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2063 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
| 2064 | { |
| 2065 | .name = "icmp", |
| 2066 | .match = icmp_match, |
| 2067 | .matchsize = sizeof(struct ipt_icmp), |
| 2068 | .checkentry = icmp_checkentry, |
| 2069 | .proto = IPPROTO_ICMP, |
| 2070 | .family = NFPROTO_IPV4, |
| 2071 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | }; |
| 2073 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2074 | static int __net_init ip_tables_net_init(struct net *net) |
| 2075 | { |
Jan Engelhardt | 383ca5b | 2009-04-14 14:24:21 +0200 | [diff] [blame] | 2076 | return xt_proto_init(net, NFPROTO_IPV4); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2077 | } |
| 2078 | |
| 2079 | static void __net_exit ip_tables_net_exit(struct net *net) |
| 2080 | { |
Jan Engelhardt | 383ca5b | 2009-04-14 14:24:21 +0200 | [diff] [blame] | 2081 | xt_proto_fini(net, NFPROTO_IPV4); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2082 | } |
| 2083 | |
| 2084 | static struct pernet_operations ip_tables_net_ops = { |
| 2085 | .init = ip_tables_net_init, |
| 2086 | .exit = ip_tables_net_exit, |
| 2087 | }; |
| 2088 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2089 | static int __init ip_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | { |
| 2091 | int ret; |
| 2092 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2093 | ret = register_pernet_subsys(&ip_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2094 | if (ret < 0) |
| 2095 | goto err1; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2096 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2097 | /* 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] | 2098 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2099 | if (ret < 0) |
| 2100 | goto err2; |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2101 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2102 | if (ret < 0) |
| 2103 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | |
| 2105 | /* Register setsockopt */ |
| 2106 | ret = nf_register_sockopt(&ipt_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2107 | if (ret < 0) |
| 2108 | goto err5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 2110 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2112 | |
| 2113 | err5: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2114 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2115 | err4: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2116 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2117 | err2: |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2118 | unregister_pernet_subsys(&ip_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2119 | err1: |
| 2120 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | } |
| 2122 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2123 | static void __exit ip_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | { |
| 2125 | nf_unregister_sockopt(&ipt_sockopts); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2126 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2127 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
| 2128 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2129 | unregister_pernet_subsys(&ip_tables_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | } |
| 2131 | |
| 2132 | EXPORT_SYMBOL(ipt_register_table); |
| 2133 | EXPORT_SYMBOL(ipt_unregister_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | EXPORT_SYMBOL(ipt_do_table); |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2135 | module_init(ip_tables_init); |
| 2136 | module_exit(ip_tables_fini); |