Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Packet matching code for ARP packets. |
| 3 | * |
| 4 | * Based heavily, if not almost entirely, upon ip_tables.c framework. |
| 5 | * |
| 6 | * Some ARP specific bits are: |
| 7 | * |
| 8 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 9 | * Copyright (C) 2006-2009 Patrick McHardy <kaber@trash.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 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/kernel.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/netdevice.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 16 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/if_arp.h> |
| 18 | #include <linux/kmod.h> |
| 19 | #include <linux/vmalloc.h> |
| 20 | #include <linux/proc_fs.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/init.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 23 | #include <linux/mutex.h> |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 24 | #include <linux/err.h> |
| 25 | #include <net/compat.h> |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 26 | #include <net/sock.h> |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 27 | #include <asm/uaccess.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_arp/arp_tables.h> |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 31 | #include "../../netfilter/xt_repldata.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | MODULE_LICENSE("GPL"); |
| 34 | MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); |
| 35 | MODULE_DESCRIPTION("arptables core"); |
| 36 | |
| 37 | /*#define DEBUG_ARP_TABLES*/ |
| 38 | /*#define DEBUG_ARP_TABLES_USER*/ |
| 39 | |
| 40 | #ifdef DEBUG_ARP_TABLES |
| 41 | #define dprintf(format, args...) printk(format , ## args) |
| 42 | #else |
| 43 | #define dprintf(format, args...) |
| 44 | #endif |
| 45 | |
| 46 | #ifdef DEBUG_ARP_TABLES_USER |
| 47 | #define duprintf(format, args...) printk(format , ## args) |
| 48 | #else |
| 49 | #define duprintf(format, args...) |
| 50 | #endif |
| 51 | |
| 52 | #ifdef CONFIG_NETFILTER_DEBUG |
Stephen Hemminger | af56760 | 2010-05-13 15:00:20 +0200 | [diff] [blame] | 53 | #define ARP_NF_ASSERT(x) WARN_ON(!(x)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #else |
| 55 | #define ARP_NF_ASSERT(x) |
| 56 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 58 | void *arpt_alloc_initial_table(const struct xt_table *info) |
| 59 | { |
| 60 | return xt_alloc_initial_table(arpt, ARPT); |
| 61 | } |
| 62 | EXPORT_SYMBOL_GPL(arpt_alloc_initial_table); |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 65 | const char *hdr_addr, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
| 67 | int i, ret; |
| 68 | |
| 69 | if (len > ARPT_DEV_ADDR_LEN_MAX) |
| 70 | len = ARPT_DEV_ADDR_LEN_MAX; |
| 71 | |
| 72 | ret = 0; |
| 73 | for (i = 0; i < len; i++) |
| 74 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; |
| 75 | |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 76 | return ret != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 79 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 80 | * Unfortunately, _b and _mask are not aligned to an int (or long int) |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 81 | * Some arches dont care, unrolling the loop is a win on them. |
Eric Dumazet | 35c7f6d | 2009-03-24 14:15:22 -0700 | [diff] [blame] | 82 | * For other arches, we only have a 16bit alignement. |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 83 | */ |
| 84 | static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask) |
| 85 | { |
| 86 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 87 | unsigned long ret = ifname_compare_aligned(_a, _b, _mask); |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 88 | #else |
| 89 | unsigned long ret = 0; |
Eric Dumazet | 35c7f6d | 2009-03-24 14:15:22 -0700 | [diff] [blame] | 90 | const u16 *a = (const u16 *)_a; |
| 91 | const u16 *b = (const u16 *)_b; |
| 92 | const u16 *mask = (const u16 *)_mask; |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 93 | int i; |
| 94 | |
Eric Dumazet | 35c7f6d | 2009-03-24 14:15:22 -0700 | [diff] [blame] | 95 | for (i = 0; i < IFNAMSIZ/sizeof(u16); i++) |
| 96 | ret |= (a[i] ^ b[i]) & mask[i]; |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 97 | #endif |
| 98 | return ret; |
| 99 | } |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | /* Returns whether packet matches rule or not. */ |
| 102 | static inline int arp_packet_match(const struct arphdr *arphdr, |
| 103 | struct net_device *dev, |
| 104 | const char *indev, |
| 105 | const char *outdev, |
| 106 | const struct arpt_arp *arpinfo) |
| 107 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 108 | const char *arpptr = (char *)(arphdr + 1); |
| 109 | const char *src_devaddr, *tgt_devaddr; |
Al Viro | 59b8bfd | 2006-09-28 14:21:07 -0700 | [diff] [blame] | 110 | __be32 src_ipaddr, tgt_ipaddr; |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 111 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 113 | #define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
| 115 | if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop, |
| 116 | ARPT_INV_ARPOP)) { |
| 117 | dprintf("ARP operation field mismatch.\n"); |
| 118 | dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n", |
| 119 | arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd, |
| 124 | ARPT_INV_ARPHRD)) { |
| 125 | dprintf("ARP hardware address format mismatch.\n"); |
| 126 | dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n", |
| 127 | arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask); |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro, |
| 132 | ARPT_INV_ARPPRO)) { |
| 133 | dprintf("ARP protocol address format mismatch.\n"); |
| 134 | dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n", |
| 135 | arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask); |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln, |
| 140 | ARPT_INV_ARPHLN)) { |
| 141 | dprintf("ARP hardware address length mismatch.\n"); |
| 142 | dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n", |
| 143 | arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask); |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | src_devaddr = arpptr; |
| 148 | arpptr += dev->addr_len; |
| 149 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); |
| 150 | arpptr += sizeof(u32); |
| 151 | tgt_devaddr = arpptr; |
| 152 | arpptr += dev->addr_len; |
| 153 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); |
| 154 | |
| 155 | if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len), |
| 156 | ARPT_INV_SRCDEVADDR) || |
| 157 | FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len), |
| 158 | ARPT_INV_TGTDEVADDR)) { |
| 159 | dprintf("Source or target device address mismatch.\n"); |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr, |
| 165 | ARPT_INV_SRCIP) || |
| 166 | FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr), |
| 167 | ARPT_INV_TGTIP)) { |
| 168 | dprintf("Source or target IP address mismatch.\n"); |
| 169 | |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 170 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
| 171 | &src_ipaddr, |
| 172 | &arpinfo->smsk.s_addr, |
| 173 | &arpinfo->src.s_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : ""); |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 175 | dprintf("TGT: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
| 176 | &tgt_ipaddr, |
| 177 | &arpinfo->tmsk.s_addr, |
| 178 | &arpinfo->tgt.s_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : ""); |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | /* Look for ifname matches. */ |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 184 | ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | if (FWINV(ret != 0, ARPT_INV_VIA_IN)) { |
| 187 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 188 | indev, arpinfo->iniface, |
| 189 | arpinfo->invflags&ARPT_INV_VIA_IN ?" (INV)":""); |
| 190 | return 0; |
| 191 | } |
| 192 | |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 193 | ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) { |
| 196 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 197 | outdev, arpinfo->outiface, |
| 198 | arpinfo->invflags&ARPT_INV_VIA_OUT ?" (INV)":""); |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | return 1; |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 203 | #undef FWINV |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | static inline int arp_checkentry(const struct arpt_arp *arp) |
| 207 | { |
| 208 | if (arp->flags & ~ARPT_F_MASK) { |
| 209 | duprintf("Unknown flag bits set: %08X\n", |
| 210 | arp->flags & ~ARPT_F_MASK); |
| 211 | return 0; |
| 212 | } |
| 213 | if (arp->invflags & ~ARPT_INV_MASK) { |
| 214 | duprintf("Unknown invflag bits set: %08X\n", |
| 215 | arp->invflags & ~ARPT_INV_MASK); |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | return 1; |
| 220 | } |
| 221 | |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 222 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 223 | arpt_error(struct sk_buff *skb, const struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 225 | net_err_ratelimited("arp_tables: error: '%s'\n", |
| 226 | (const char *)par->targinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | return NF_DROP; |
| 229 | } |
| 230 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 231 | static inline const struct xt_entry_target * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 232 | arpt_get_target_c(const struct arpt_entry *e) |
| 233 | { |
| 234 | return arpt_get_target((struct arpt_entry *)e); |
| 235 | } |
| 236 | |
| 237 | static inline struct arpt_entry * |
| 238 | get_entry(const void *base, unsigned int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | { |
| 240 | return (struct arpt_entry *)(base + offset); |
| 241 | } |
| 242 | |
Florian Westphal | 6c7941d | 2015-07-14 17:51:10 +0200 | [diff] [blame] | 243 | static inline |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 244 | struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry) |
| 245 | { |
| 246 | return (void *)entry + entry->next_offset; |
| 247 | } |
| 248 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 249 | unsigned int arpt_do_table(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | unsigned int hook, |
David S. Miller | b85c3dc | 2015-04-03 21:18:46 -0400 | [diff] [blame] | 251 | const struct nf_hook_state *state, |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 252 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | { |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 254 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | unsigned int verdict = NF_DROP; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 256 | const struct arphdr *arp; |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 257 | struct arpt_entry *e, **jumpstack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | const char *indev, *outdev; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 259 | const void *table_base; |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 260 | unsigned int cpu, stackidx = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 261 | const struct xt_table_info *private; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 262 | struct xt_action_param acpar; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 263 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
Pavel Emelyanov | 988b705 | 2008-03-03 12:20:57 -0800 | [diff] [blame] | 265 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | return NF_DROP; |
| 267 | |
David S. Miller | b85c3dc | 2015-04-03 21:18:46 -0400 | [diff] [blame] | 268 | indev = state->in ? state->in->name : nulldevname; |
| 269 | outdev = state->out ? state->out->name : nulldevname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 271 | local_bh_disable(); |
| 272 | addend = xt_write_recseq_begin(); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 273 | private = table->private; |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 274 | cpu = smp_processor_id(); |
Will Deacon | b416c14 | 2013-10-21 13:14:53 +0100 | [diff] [blame] | 275 | /* |
| 276 | * Ensure we load private-> members after we've fetched the base |
| 277 | * pointer. |
| 278 | */ |
| 279 | smp_read_barrier_depends(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 280 | table_base = private->entries; |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 281 | jumpstack = (struct arpt_entry **)private->jumpstack[cpu]; |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 282 | |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 283 | /* No TEE support for arptables, so no need to switch to alternate |
| 284 | * stack. All targets that reenter must return absolute verdicts. |
| 285 | */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 286 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
David S. Miller | b85c3dc | 2015-04-03 21:18:46 -0400 | [diff] [blame] | 288 | acpar.in = state->in; |
| 289 | acpar.out = state->out; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 290 | acpar.hooknum = hook; |
| 291 | acpar.family = NFPROTO_ARP; |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 292 | acpar.hotdrop = false; |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 293 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 294 | arp = arp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | do { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 296 | const struct xt_entry_target *t; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 297 | struct xt_counters *counter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 299 | if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) { |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 300 | e = arpt_next_entry(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 301 | continue; |
| 302 | } |
| 303 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 304 | counter = xt_get_this_cpu_counter(&e->counters); |
| 305 | ADD_COUNTER(*counter, arp_hdr_len(skb->dev), 1); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 306 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 307 | t = arpt_get_target_c(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 308 | |
| 309 | /* Standard target? */ |
| 310 | if (!t->u.kernel.target->target) { |
| 311 | int v; |
| 312 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 313 | v = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 314 | if (v < 0) { |
| 315 | /* Pop from stack? */ |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 316 | if (v != XT_RETURN) { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 317 | verdict = (unsigned int)(-v) - 1; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 318 | break; |
| 319 | } |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 320 | if (stackidx == 0) { |
| 321 | e = get_entry(table_base, |
| 322 | private->underflow[hook]); |
| 323 | } else { |
| 324 | e = jumpstack[--stackidx]; |
| 325 | e = arpt_next_entry(e); |
| 326 | } |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 327 | continue; |
| 328 | } |
| 329 | if (table_base + v |
| 330 | != arpt_next_entry(e)) { |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 331 | jumpstack[stackidx++] = e; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | e = get_entry(table_base, v); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 335 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 337 | |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 338 | acpar.target = t->u.kernel.target; |
| 339 | acpar.targinfo = t->data; |
| 340 | verdict = t->u.kernel.target->target(skb, &acpar); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 341 | |
| 342 | /* Target might have changed stuff. */ |
| 343 | arp = arp_hdr(skb); |
| 344 | |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 345 | if (verdict == XT_CONTINUE) |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 346 | e = arpt_next_entry(e); |
| 347 | else |
| 348 | /* Verdict */ |
| 349 | break; |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 350 | } while (!acpar.hotdrop); |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 351 | xt_write_recseq_end(addend); |
| 352 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 354 | if (acpar.hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | return NF_DROP; |
| 356 | else |
| 357 | return verdict; |
| 358 | } |
| 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | /* All zeroes == unconditional rule. */ |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 361 | static inline bool unconditional(const struct arpt_arp *arp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 363 | static const struct arpt_arp uncond; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 365 | return memcmp(arp, &uncond, sizeof(uncond)) == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | /* Figures out from what hook each rule can be called: returns 0 if |
| 369 | * there are loops. Puts hook bitmask in comefrom. |
| 370 | */ |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 371 | static int mark_source_chains(const struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 372 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | { |
| 374 | unsigned int hook; |
| 375 | |
| 376 | /* No recursion; use packet counter to save back ptrs (reset |
| 377 | * to 0 as we leave), and comefrom to save source hook bitmask. |
| 378 | */ |
| 379 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { |
| 380 | unsigned int pos = newinfo->hook_entry[hook]; |
| 381 | struct arpt_entry *e |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 382 | = (struct arpt_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | if (!(valid_hooks & (1 << hook))) |
| 385 | continue; |
| 386 | |
| 387 | /* Set initial back pointer. */ |
| 388 | e->counters.pcnt = pos; |
| 389 | |
| 390 | for (;;) { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 391 | const struct xt_standard_target *t |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 392 | = (void *)arpt_get_target_c(e); |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 393 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) { |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 396 | pr_notice("arptables: loop hook %u pos %u %08X.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | hook, pos, e->comefrom); |
| 398 | return 0; |
| 399 | } |
| 400 | e->comefrom |
| 401 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); |
| 402 | |
| 403 | /* Unconditional return/END. */ |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 404 | if ((e->target_offset == sizeof(struct arpt_entry) && |
| 405 | (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 406 | XT_STANDARD_TARGET) == 0) && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 407 | t->verdict < 0 && unconditional(&e->arp)) || |
| 408 | visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | unsigned int oldpos, size; |
| 410 | |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 411 | if ((strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 412 | XT_STANDARD_TARGET) == 0) && |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 413 | t->verdict < -NF_MAX_VERDICT - 1) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 414 | duprintf("mark_source_chains: bad " |
| 415 | "negative verdict (%i)\n", |
| 416 | t->verdict); |
| 417 | return 0; |
| 418 | } |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | /* Return: backtrack through the last |
| 421 | * big jump. |
| 422 | */ |
| 423 | do { |
| 424 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); |
| 425 | oldpos = pos; |
| 426 | pos = e->counters.pcnt; |
| 427 | e->counters.pcnt = 0; |
| 428 | |
| 429 | /* We're at the start. */ |
| 430 | if (pos == oldpos) |
| 431 | goto next; |
| 432 | |
| 433 | e = (struct arpt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 434 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } while (oldpos == pos + e->next_offset); |
| 436 | |
| 437 | /* Move along one */ |
| 438 | size = e->next_offset; |
| 439 | e = (struct arpt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 440 | (entry0 + pos + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | e->counters.pcnt = pos; |
| 442 | pos += size; |
| 443 | } else { |
| 444 | int newpos = t->verdict; |
| 445 | |
| 446 | if (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 447 | XT_STANDARD_TARGET) == 0 && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 448 | newpos >= 0) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 449 | if (newpos > newinfo->size - |
| 450 | sizeof(struct arpt_entry)) { |
| 451 | duprintf("mark_source_chains: " |
| 452 | "bad verdict (%i)\n", |
| 453 | newpos); |
| 454 | return 0; |
| 455 | } |
| 456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | /* This a jump; chase it. */ |
| 458 | duprintf("Jump rule %u -> %u\n", |
| 459 | pos, newpos); |
| 460 | } else { |
| 461 | /* ... this is a fallthru */ |
| 462 | newpos = pos + e->next_offset; |
| 463 | } |
| 464 | e = (struct arpt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 465 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | e->counters.pcnt = pos; |
| 467 | pos = newpos; |
| 468 | } |
| 469 | } |
| 470 | next: |
| 471 | duprintf("Finished chain %u\n", hook); |
| 472 | } |
| 473 | return 1; |
| 474 | } |
| 475 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 476 | static inline int check_entry(const struct arpt_entry *e, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 478 | const struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | if (!arp_checkentry(&e->arp)) { |
| 481 | duprintf("arp_tables: arp check failed %p %s.\n", e, name); |
| 482 | return -EINVAL; |
| 483 | } |
| 484 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 485 | if (e->target_offset + sizeof(struct xt_entry_target) > e->next_offset) |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 486 | return -EINVAL; |
| 487 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 488 | t = arpt_get_target_c(e); |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 489 | if (e->target_offset + t->u.target_size > e->next_offset) |
| 490 | return -EINVAL; |
| 491 | |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 492 | return 0; |
| 493 | } |
| 494 | |
| 495 | static inline int check_target(struct arpt_entry *e, const char *name) |
| 496 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 497 | struct xt_entry_target *t = arpt_get_target(e); |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 498 | int ret; |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 499 | struct xt_tgchk_param par = { |
| 500 | .table = name, |
| 501 | .entryinfo = e, |
| 502 | .target = t->u.kernel.target, |
| 503 | .targinfo = t->data, |
| 504 | .hook_mask = e->comefrom, |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 505 | .family = NFPROTO_ARP, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 506 | }; |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 507 | |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 508 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 509 | if (ret < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | duprintf("arp_tables: check failed for `%s'.\n", |
| 511 | t->u.kernel.target->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 512 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 514 | return 0; |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | static inline int |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 518 | find_check_entry(struct arpt_entry *e, const char *name, unsigned int size) |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 519 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 520 | struct xt_entry_target *t; |
Jan Engelhardt | 95eea85 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 521 | struct xt_target *target; |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 522 | int ret; |
| 523 | |
| 524 | ret = check_entry(e, name); |
| 525 | if (ret) |
| 526 | return ret; |
| 527 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 528 | e->counters.pcnt = xt_percpu_counter_alloc(); |
| 529 | if (IS_ERR_VALUE(e->counters.pcnt)) |
| 530 | return -ENOMEM; |
| 531 | |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 532 | t = arpt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 533 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
| 534 | t->u.user.revision); |
| 535 | if (IS_ERR(target)) { |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 536 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 537 | ret = PTR_ERR(target); |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 538 | goto out; |
| 539 | } |
| 540 | t->u.kernel.target = target; |
| 541 | |
| 542 | ret = check_target(e, name); |
| 543 | if (ret) |
| 544 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 546 | err: |
| 547 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | out: |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 549 | xt_percpu_counter_free(e->counters.pcnt); |
| 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | return ret; |
| 552 | } |
| 553 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 554 | static bool check_underflow(const struct arpt_entry *e) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 555 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 556 | const struct xt_entry_target *t; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 557 | unsigned int verdict; |
| 558 | |
| 559 | if (!unconditional(&e->arp)) |
| 560 | return false; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 561 | t = arpt_get_target_c(e); |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 562 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
| 563 | return false; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 564 | verdict = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 565 | verdict = -verdict - 1; |
| 566 | return verdict == NF_DROP || verdict == NF_ACCEPT; |
| 567 | } |
| 568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 570 | struct xt_table_info *newinfo, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 571 | const unsigned char *base, |
| 572 | const unsigned char *limit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | const unsigned int *hook_entries, |
| 574 | const unsigned int *underflows, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 575 | unsigned int valid_hooks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | { |
| 577 | unsigned int h; |
| 578 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 579 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 || |
| 580 | (unsigned char *)e + sizeof(struct arpt_entry) >= limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | duprintf("Bad offset %p\n", e); |
| 582 | return -EINVAL; |
| 583 | } |
| 584 | |
| 585 | if (e->next_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 586 | < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | duprintf("checking: element %p size %u\n", |
| 588 | e, e->next_offset); |
| 589 | return -EINVAL; |
| 590 | } |
| 591 | |
| 592 | /* Check hooks & underflows */ |
| 593 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { |
Jan Engelhardt | a7d5173 | 2009-07-18 14:52:58 +0200 | [diff] [blame] | 594 | if (!(valid_hooks & (1 << h))) |
| 595 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | if ((unsigned char *)e - base == hook_entries[h]) |
| 597 | newinfo->hook_entry[h] = hook_entries[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 598 | if ((unsigned char *)e - base == underflows[h]) { |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 599 | if (!check_underflow(e)) { |
| 600 | pr_err("Underflows must be unconditional and " |
| 601 | "use the STANDARD target with " |
| 602 | "ACCEPT/DROP\n"); |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 603 | return -EINVAL; |
| 604 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | newinfo->underflow[h] = underflows[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 606 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 610 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | e->comefrom = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | return 0; |
| 613 | } |
| 614 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 615 | static inline void cleanup_entry(struct arpt_entry *e) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 617 | struct xt_tgdtor_param par; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 618 | struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | t = arpt_get_target(e); |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 621 | par.target = t->u.kernel.target; |
| 622 | par.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 623 | par.family = NFPROTO_ARP; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 624 | if (par.target->destroy != NULL) |
| 625 | par.target->destroy(&par); |
| 626 | module_put(par.target->me); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 627 | xt_percpu_counter_free(e->counters.pcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | /* Checks and translates the user-supplied table segment (held in |
| 631 | * newinfo). |
| 632 | */ |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 633 | static int translate_table(struct xt_table_info *newinfo, void *entry0, |
| 634 | const struct arpt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 636 | struct arpt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | unsigned int i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 638 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 640 | newinfo->size = repl->size; |
| 641 | newinfo->number = repl->num_entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
| 643 | /* Init all hooks to impossible value. */ |
| 644 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 645 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 646 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 647 | } |
| 648 | |
| 649 | duprintf("translate_table: size %u\n", newinfo->size); |
| 650 | i = 0; |
| 651 | |
| 652 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 653 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 654 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 655 | entry0 + repl->size, |
| 656 | repl->hook_entry, |
| 657 | repl->underflow, |
| 658 | repl->valid_hooks); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 659 | if (ret != 0) |
| 660 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 661 | ++i; |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 662 | if (strcmp(arpt_get_target(iter)->u.user.name, |
| 663 | XT_ERROR_TARGET) == 0) |
| 664 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 665 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret); |
| 667 | if (ret != 0) |
| 668 | return ret; |
| 669 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 670 | if (i != repl->num_entries) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | duprintf("translate_table: %u not %u entries\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 672 | i, repl->num_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | return -EINVAL; |
| 674 | } |
| 675 | |
| 676 | /* Check hooks all assigned */ |
| 677 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 678 | /* Only hooks which are valid */ |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 679 | if (!(repl->valid_hooks & (1 << i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | continue; |
| 681 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 682 | duprintf("Invalid hook entry %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 683 | i, repl->hook_entry[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | return -EINVAL; |
| 685 | } |
| 686 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 687 | duprintf("Invalid underflow %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 688 | i, repl->underflow[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | return -EINVAL; |
| 690 | } |
| 691 | } |
| 692 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 693 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 694 | duprintf("Looping hook\n"); |
| 695 | return -ELOOP; |
| 696 | } |
| 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | /* Finally, each sanity check must pass */ |
| 699 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 700 | xt_entry_foreach(iter, entry0, newinfo->size) { |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 701 | ret = find_check_entry(iter, repl->name, repl->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 702 | if (ret != 0) |
| 703 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 704 | ++i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 705 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 707 | if (ret != 0) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 708 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 709 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 710 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 711 | cleanup_entry(iter); |
| 712 | } |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 713 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | } |
| 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | return ret; |
| 717 | } |
| 718 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 719 | static void get_counters(const struct xt_table_info *t, |
| 720 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 722 | struct arpt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | unsigned int cpu; |
| 724 | unsigned int i; |
| 725 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 726 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 727 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | i = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 730 | xt_entry_foreach(iter, t->entries, t->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 731 | struct xt_counters *tmp; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 732 | u64 bcnt, pcnt; |
| 733 | unsigned int start; |
| 734 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 735 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 736 | do { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 737 | start = read_seqcount_begin(s); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 738 | bcnt = tmp->bcnt; |
| 739 | pcnt = tmp->pcnt; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 740 | } while (read_seqcount_retry(s, start)); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 741 | |
| 742 | ADD_COUNTER(counters[i], bcnt, pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 743 | ++i; |
| 744 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | } |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 746 | } |
| 747 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 748 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | { |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 750 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 751 | struct xt_counters *counters; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 752 | const struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
| 754 | /* We need atomic snapshot of counters: rest doesn't change |
| 755 | * (other than comefrom, which userspace doesn't care |
| 756 | * about). |
| 757 | */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 758 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 759 | counters = vzalloc(countersize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
| 761 | if (counters == NULL) |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 762 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 764 | get_counters(private, counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 766 | return counters; |
| 767 | } |
| 768 | |
| 769 | static int copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 770 | const struct xt_table *table, |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 771 | void __user *userptr) |
| 772 | { |
| 773 | unsigned int off, num; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 774 | const struct arpt_entry *e; |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 775 | struct xt_counters *counters; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 776 | struct xt_table_info *private = table->private; |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 777 | int ret = 0; |
| 778 | void *loc_cpu_entry; |
| 779 | |
| 780 | counters = alloc_counters(table); |
| 781 | if (IS_ERR(counters)) |
| 782 | return PTR_ERR(counters); |
| 783 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 784 | loc_cpu_entry = private->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 785 | /* ... then copy entire thing ... */ |
| 786 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | ret = -EFAULT; |
| 788 | goto free_counters; |
| 789 | } |
| 790 | |
| 791 | /* FIXME: use iterator macros --RR */ |
| 792 | /* ... then go back and fix counters and names */ |
| 793 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 794 | const struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 796 | e = (struct arpt_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | if (copy_to_user(userptr + off |
| 798 | + offsetof(struct arpt_entry, counters), |
| 799 | &counters[num], |
| 800 | sizeof(counters[num])) != 0) { |
| 801 | ret = -EFAULT; |
| 802 | goto free_counters; |
| 803 | } |
| 804 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 805 | t = arpt_get_target_c(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | if (copy_to_user(userptr + off + e->target_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 807 | + offsetof(struct xt_entry_target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | u.user.name), |
| 809 | t->u.kernel.target->name, |
| 810 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 811 | ret = -EFAULT; |
| 812 | goto free_counters; |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | free_counters: |
| 817 | vfree(counters); |
| 818 | return ret; |
| 819 | } |
| 820 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 821 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 822 | static void compat_standard_from_user(void *dst, const void *src) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 823 | { |
| 824 | int v = *(compat_int_t *)src; |
| 825 | |
| 826 | if (v > 0) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 827 | v += xt_compat_calc_jump(NFPROTO_ARP, v); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 828 | memcpy(dst, &v, sizeof(v)); |
| 829 | } |
| 830 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 831 | static int compat_standard_to_user(void __user *dst, const void *src) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 832 | { |
| 833 | compat_int_t cv = *(int *)src; |
| 834 | |
| 835 | if (cv > 0) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 836 | cv -= xt_compat_calc_jump(NFPROTO_ARP, cv); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 837 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
| 838 | } |
| 839 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 840 | static int compat_calc_entry(const struct arpt_entry *e, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 841 | const struct xt_table_info *info, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 842 | const void *base, struct xt_table_info *newinfo) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 843 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 844 | const struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 845 | unsigned int entry_offset; |
| 846 | int off, i, ret; |
| 847 | |
| 848 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); |
| 849 | entry_offset = (void *)e - base; |
| 850 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 851 | t = arpt_get_target_c(e); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 852 | off += xt_compat_target_offset(t->u.kernel.target); |
| 853 | newinfo->size -= off; |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 854 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 855 | if (ret) |
| 856 | return ret; |
| 857 | |
| 858 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 859 | if (info->hook_entry[i] && |
| 860 | (e < (struct arpt_entry *)(base + info->hook_entry[i]))) |
| 861 | newinfo->hook_entry[i] -= off; |
| 862 | if (info->underflow[i] && |
| 863 | (e < (struct arpt_entry *)(base + info->underflow[i]))) |
| 864 | newinfo->underflow[i] -= off; |
| 865 | } |
| 866 | return 0; |
| 867 | } |
| 868 | |
| 869 | static int compat_table_info(const struct xt_table_info *info, |
| 870 | struct xt_table_info *newinfo) |
| 871 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 872 | struct arpt_entry *iter; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 873 | const void *loc_cpu_entry; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 874 | int ret; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 875 | |
| 876 | if (!newinfo || !info) |
| 877 | return -EINVAL; |
| 878 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 879 | /* we dont care about newinfo->entries */ |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 880 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
| 881 | newinfo->initial_entries = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 882 | loc_cpu_entry = info->entries; |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 883 | xt_compat_init_offsets(NFPROTO_ARP, info->number); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 884 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
| 885 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); |
| 886 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 887 | return ret; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 888 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 889 | return 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 890 | } |
| 891 | #endif |
| 892 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 893 | static int get_info(struct net *net, void __user *user, |
| 894 | const int *len, int compat) |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 895 | { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 896 | char name[XT_TABLE_MAXNAMELEN]; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 897 | struct xt_table *t; |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 898 | int ret; |
| 899 | |
| 900 | if (*len != sizeof(struct arpt_getinfo)) { |
| 901 | duprintf("length %u != %Zu\n", *len, |
| 902 | sizeof(struct arpt_getinfo)); |
| 903 | return -EINVAL; |
| 904 | } |
| 905 | |
| 906 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 907 | return -EFAULT; |
| 908 | |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 909 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 910 | #ifdef CONFIG_COMPAT |
| 911 | if (compat) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 912 | xt_compat_lock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 913 | #endif |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 914 | t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name), |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 915 | "arptable_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 916 | if (!IS_ERR_OR_NULL(t)) { |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 917 | struct arpt_getinfo info; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 918 | const struct xt_table_info *private = t->private; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 919 | #ifdef CONFIG_COMPAT |
Alexey Dobriyan | 14c7dbe | 2010-02-08 11:17:43 -0800 | [diff] [blame] | 920 | struct xt_table_info tmp; |
| 921 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 922 | if (compat) { |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 923 | ret = compat_table_info(private, &tmp); |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 924 | xt_compat_flush_offsets(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 925 | private = &tmp; |
| 926 | } |
| 927 | #endif |
Vasiliy Kulikov | 1a8b7a6 | 2010-11-03 08:44:12 +0100 | [diff] [blame] | 928 | memset(&info, 0, sizeof(info)); |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 929 | info.valid_hooks = t->valid_hooks; |
| 930 | memcpy(info.hook_entry, private->hook_entry, |
| 931 | sizeof(info.hook_entry)); |
| 932 | memcpy(info.underflow, private->underflow, |
| 933 | sizeof(info.underflow)); |
| 934 | info.num_entries = private->number; |
| 935 | info.size = private->size; |
| 936 | strcpy(info.name, name); |
| 937 | |
| 938 | if (copy_to_user(user, &info, *len) != 0) |
| 939 | ret = -EFAULT; |
| 940 | else |
| 941 | ret = 0; |
| 942 | xt_table_unlock(t); |
| 943 | module_put(t->me); |
| 944 | } else |
| 945 | ret = t ? PTR_ERR(t) : -ENOENT; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 946 | #ifdef CONFIG_COMPAT |
| 947 | if (compat) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 948 | xt_compat_unlock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 949 | #endif |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 950 | return ret; |
| 951 | } |
| 952 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 953 | static int get_entries(struct net *net, struct arpt_get_entries __user *uptr, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 954 | const int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | { |
| 956 | int ret; |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 957 | struct arpt_get_entries get; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 958 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 960 | if (*len < sizeof(get)) { |
| 961 | duprintf("get_entries: %u < %Zu\n", *len, sizeof(get)); |
| 962 | return -EINVAL; |
| 963 | } |
| 964 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 965 | return -EFAULT; |
| 966 | if (*len != sizeof(struct arpt_get_entries) + get.size) { |
| 967 | duprintf("get_entries: %u != %Zu\n", *len, |
| 968 | sizeof(struct arpt_get_entries) + get.size); |
| 969 | return -EINVAL; |
| 970 | } |
| 971 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 972 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 973 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 974 | const struct xt_table_info *private = t->private; |
| 975 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | duprintf("t->private->number = %u\n", |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 977 | private->number); |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 978 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 979 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | t, uptr->entrytable); |
| 981 | else { |
| 982 | duprintf("get_entries: I've got %u not %u!\n", |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 983 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 984 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | } |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 986 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 987 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | } else |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 989 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | |
| 991 | return ret; |
| 992 | } |
| 993 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 994 | static int __do_replace(struct net *net, const char *name, |
| 995 | unsigned int valid_hooks, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 996 | struct xt_table_info *newinfo, |
| 997 | unsigned int num_counters, |
| 998 | void __user *counters_ptr) |
| 999 | { |
| 1000 | int ret; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1001 | struct xt_table *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1002 | struct xt_table_info *oldinfo; |
| 1003 | struct xt_counters *counters; |
| 1004 | void *loc_cpu_old_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1005 | struct arpt_entry *iter; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1006 | |
| 1007 | ret = 0; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 1008 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1009 | if (!counters) { |
| 1010 | ret = -ENOMEM; |
| 1011 | goto out; |
| 1012 | } |
| 1013 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1014 | t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name), |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1015 | "arptable_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1016 | if (IS_ERR_OR_NULL(t)) { |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1017 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1018 | goto free_newinfo_counters_untrans; |
| 1019 | } |
| 1020 | |
| 1021 | /* You lied! */ |
| 1022 | if (valid_hooks != t->valid_hooks) { |
| 1023 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1024 | valid_hooks, t->valid_hooks); |
| 1025 | ret = -EINVAL; |
| 1026 | goto put_module; |
| 1027 | } |
| 1028 | |
| 1029 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 1030 | if (!oldinfo) |
| 1031 | goto put_module; |
| 1032 | |
| 1033 | /* Update module usage count based on number of rules */ |
| 1034 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1035 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
| 1036 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1037 | (newinfo->number <= oldinfo->initial_entries)) |
| 1038 | module_put(t->me); |
| 1039 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1040 | (newinfo->number <= oldinfo->initial_entries)) |
| 1041 | module_put(t->me); |
| 1042 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1043 | /* Get the old counters, and synchronize with replace */ |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1044 | get_counters(oldinfo, counters); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1045 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1046 | /* Decrease module usage counts and free resource */ |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1047 | loc_cpu_old_entry = oldinfo->entries; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1048 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1049 | cleanup_entry(iter); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1050 | |
| 1051 | xt_free_table_info(oldinfo); |
| 1052 | if (copy_to_user(counters_ptr, counters, |
Thomas Graf | c58dd2d | 2014-04-04 17:57:45 +0200 | [diff] [blame] | 1053 | sizeof(struct xt_counters) * num_counters) != 0) { |
| 1054 | /* Silent error, can't fail, new table is already in place */ |
| 1055 | net_warn_ratelimited("arptables: counters copy to user failed while replacing table\n"); |
| 1056 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1057 | vfree(counters); |
| 1058 | xt_table_unlock(t); |
| 1059 | return ret; |
| 1060 | |
| 1061 | put_module: |
| 1062 | module_put(t->me); |
| 1063 | xt_table_unlock(t); |
| 1064 | free_newinfo_counters_untrans: |
| 1065 | vfree(counters); |
| 1066 | out: |
| 1067 | return ret; |
| 1068 | } |
| 1069 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1070 | static int do_replace(struct net *net, const void __user *user, |
| 1071 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | { |
| 1073 | int ret; |
| 1074 | struct arpt_replace tmp; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1075 | struct xt_table_info *newinfo; |
| 1076 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1077 | struct arpt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | |
| 1079 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1080 | return -EFAULT; |
| 1081 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1082 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1083 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1084 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1085 | if (tmp.num_counters == 0) |
| 1086 | return -EINVAL; |
| 1087 | |
Vasiliy Kulikov | 42eab94 | 2011-03-15 13:35:21 +0100 | [diff] [blame] | 1088 | tmp.name[sizeof(tmp.name)-1] = 0; |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1089 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1090 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | if (!newinfo) |
| 1092 | return -ENOMEM; |
| 1093 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1094 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1095 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | tmp.size) != 0) { |
| 1097 | ret = -EFAULT; |
| 1098 | goto free_newinfo; |
| 1099 | } |
| 1100 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 1101 | ret = translate_table(newinfo, loc_cpu_entry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | if (ret != 0) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1103 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | |
| 1105 | duprintf("arp_tables: Translated table\n"); |
| 1106 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1107 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1108 | tmp.num_counters, tmp.counters); |
| 1109 | if (ret) |
| 1110 | goto free_newinfo_untrans; |
| 1111 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1113 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1114 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1115 | cleanup_entry(iter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1117 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | return ret; |
| 1119 | } |
| 1120 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1121 | static int do_add_counters(struct net *net, const void __user *user, |
| 1122 | unsigned int len, int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | { |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1124 | unsigned int i; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1125 | struct xt_counters_info tmp; |
| 1126 | struct xt_counters *paddc; |
| 1127 | unsigned int num_counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1128 | const char *name; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1129 | int size; |
| 1130 | void *ptmp; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1131 | struct xt_table *t; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1132 | const struct xt_table_info *private; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1133 | int ret = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1134 | struct arpt_entry *iter; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1135 | unsigned int addend; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1136 | #ifdef CONFIG_COMPAT |
| 1137 | struct compat_xt_counters_info compat_tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1139 | if (compat) { |
| 1140 | ptmp = &compat_tmp; |
| 1141 | size = sizeof(struct compat_xt_counters_info); |
| 1142 | } else |
| 1143 | #endif |
| 1144 | { |
| 1145 | ptmp = &tmp; |
| 1146 | size = sizeof(struct xt_counters_info); |
| 1147 | } |
| 1148 | |
| 1149 | if (copy_from_user(ptmp, user, size) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | return -EFAULT; |
| 1151 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1152 | #ifdef CONFIG_COMPAT |
| 1153 | if (compat) { |
| 1154 | num_counters = compat_tmp.num_counters; |
| 1155 | name = compat_tmp.name; |
| 1156 | } else |
| 1157 | #endif |
| 1158 | { |
| 1159 | num_counters = tmp.num_counters; |
| 1160 | name = tmp.name; |
| 1161 | } |
| 1162 | |
| 1163 | if (len != size + num_counters * sizeof(struct xt_counters)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | return -EINVAL; |
| 1165 | |
Eric Dumazet | e12f8e2 | 2010-06-04 13:31:29 +0200 | [diff] [blame] | 1166 | paddc = vmalloc(len - size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | if (!paddc) |
| 1168 | return -ENOMEM; |
| 1169 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1170 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | ret = -EFAULT; |
| 1172 | goto free; |
| 1173 | } |
| 1174 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1175 | t = xt_find_table_lock(net, NFPROTO_ARP, name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1176 | if (IS_ERR_OR_NULL(t)) { |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1177 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | goto free; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1179 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1181 | local_bh_disable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1182 | private = t->private; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1183 | if (private->number != num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | ret = -EINVAL; |
| 1185 | goto unlock_up_free; |
| 1186 | } |
| 1187 | |
| 1188 | i = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1189 | |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1190 | addend = xt_write_recseq_begin(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1191 | xt_entry_foreach(iter, private->entries, private->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1192 | struct xt_counters *tmp; |
| 1193 | |
| 1194 | tmp = xt_get_this_cpu_counter(&iter->counters); |
| 1195 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1196 | ++i; |
| 1197 | } |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1198 | xt_write_recseq_end(addend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | unlock_up_free: |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1200 | local_bh_enable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1201 | xt_table_unlock(t); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1202 | module_put(t->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | free: |
| 1204 | vfree(paddc); |
| 1205 | |
| 1206 | return ret; |
| 1207 | } |
| 1208 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1209 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1210 | static inline void compat_release_entry(struct compat_arpt_entry *e) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1211 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1212 | struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1213 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1214 | t = compat_arpt_get_target(e); |
| 1215 | module_put(t->u.kernel.target->me); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1216 | } |
| 1217 | |
| 1218 | static inline int |
| 1219 | check_compat_entry_size_and_hooks(struct compat_arpt_entry *e, |
| 1220 | struct xt_table_info *newinfo, |
| 1221 | unsigned int *size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1222 | const unsigned char *base, |
| 1223 | const unsigned char *limit, |
| 1224 | const unsigned int *hook_entries, |
| 1225 | const unsigned int *underflows, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1226 | const char *name) |
| 1227 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1228 | struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1229 | struct xt_target *target; |
| 1230 | unsigned int entry_offset; |
| 1231 | int ret, off, h; |
| 1232 | |
| 1233 | duprintf("check_compat_entry_size_and_hooks %p\n", e); |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 1234 | if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 || |
| 1235 | (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit) { |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1236 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
| 1237 | return -EINVAL; |
| 1238 | } |
| 1239 | |
| 1240 | if (e->next_offset < sizeof(struct compat_arpt_entry) + |
| 1241 | sizeof(struct compat_xt_entry_target)) { |
| 1242 | duprintf("checking: element %p size %u\n", |
| 1243 | e, e->next_offset); |
| 1244 | return -EINVAL; |
| 1245 | } |
| 1246 | |
| 1247 | /* For purposes of check_entry casting the compat entry is fine */ |
| 1248 | ret = check_entry((struct arpt_entry *)e, name); |
| 1249 | if (ret) |
| 1250 | return ret; |
| 1251 | |
| 1252 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); |
| 1253 | entry_offset = (void *)e - (void *)base; |
| 1254 | |
| 1255 | t = compat_arpt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1256 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
| 1257 | t->u.user.revision); |
| 1258 | if (IS_ERR(target)) { |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1259 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
| 1260 | t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1261 | ret = PTR_ERR(target); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1262 | goto out; |
| 1263 | } |
| 1264 | t->u.kernel.target = target; |
| 1265 | |
| 1266 | off += xt_compat_target_offset(target); |
| 1267 | *size += off; |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1268 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1269 | if (ret) |
| 1270 | goto release_target; |
| 1271 | |
| 1272 | /* Check hooks & underflows */ |
| 1273 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { |
| 1274 | if ((unsigned char *)e - base == hook_entries[h]) |
| 1275 | newinfo->hook_entry[h] = hook_entries[h]; |
| 1276 | if ((unsigned char *)e - base == underflows[h]) |
| 1277 | newinfo->underflow[h] = underflows[h]; |
| 1278 | } |
| 1279 | |
| 1280 | /* Clear counters and comefrom */ |
| 1281 | memset(&e->counters, 0, sizeof(e->counters)); |
| 1282 | e->comefrom = 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1283 | return 0; |
| 1284 | |
| 1285 | release_target: |
| 1286 | module_put(t->u.kernel.target->me); |
| 1287 | out: |
| 1288 | return ret; |
| 1289 | } |
| 1290 | |
| 1291 | static int |
| 1292 | compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, |
| 1293 | unsigned int *size, const char *name, |
| 1294 | struct xt_table_info *newinfo, unsigned char *base) |
| 1295 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1296 | struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1297 | struct xt_target *target; |
| 1298 | struct arpt_entry *de; |
| 1299 | unsigned int origsize; |
| 1300 | int ret, h; |
| 1301 | |
| 1302 | ret = 0; |
| 1303 | origsize = *size; |
| 1304 | de = (struct arpt_entry *)*dstptr; |
| 1305 | memcpy(de, e, sizeof(struct arpt_entry)); |
| 1306 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
| 1307 | |
| 1308 | *dstptr += sizeof(struct arpt_entry); |
| 1309 | *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); |
| 1310 | |
| 1311 | de->target_offset = e->target_offset - (origsize - *size); |
| 1312 | t = compat_arpt_get_target(e); |
| 1313 | target = t->u.kernel.target; |
| 1314 | xt_compat_target_from_user(t, dstptr, size); |
| 1315 | |
| 1316 | de->next_offset = e->next_offset - (origsize - *size); |
| 1317 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { |
| 1318 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1319 | newinfo->hook_entry[h] -= origsize - *size; |
| 1320 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1321 | newinfo->underflow[h] -= origsize - *size; |
| 1322 | } |
| 1323 | return ret; |
| 1324 | } |
| 1325 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1326 | static int translate_compat_table(const char *name, |
| 1327 | unsigned int valid_hooks, |
| 1328 | struct xt_table_info **pinfo, |
| 1329 | void **pentry0, |
| 1330 | unsigned int total_size, |
| 1331 | unsigned int number, |
| 1332 | unsigned int *hook_entries, |
| 1333 | unsigned int *underflows) |
| 1334 | { |
| 1335 | unsigned int i, j; |
| 1336 | struct xt_table_info *newinfo, *info; |
| 1337 | void *pos, *entry0, *entry1; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1338 | struct compat_arpt_entry *iter0; |
| 1339 | struct arpt_entry *iter1; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1340 | unsigned int size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1341 | int ret = 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1342 | |
| 1343 | info = *pinfo; |
| 1344 | entry0 = *pentry0; |
| 1345 | size = total_size; |
| 1346 | info->number = number; |
| 1347 | |
| 1348 | /* Init all hooks to impossible value. */ |
| 1349 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 1350 | info->hook_entry[i] = 0xFFFFFFFF; |
| 1351 | info->underflow[i] = 0xFFFFFFFF; |
| 1352 | } |
| 1353 | |
| 1354 | duprintf("translate_compat_table: size %u\n", info->size); |
| 1355 | j = 0; |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1356 | xt_compat_lock(NFPROTO_ARP); |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 1357 | xt_compat_init_offsets(NFPROTO_ARP, number); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1358 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1359 | xt_entry_foreach(iter0, entry0, total_size) { |
| 1360 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1361 | entry0, |
| 1362 | entry0 + total_size, |
| 1363 | hook_entries, |
| 1364 | underflows, |
| 1365 | name); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1366 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1367 | goto out_unlock; |
| 1368 | ++j; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1369 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1370 | |
| 1371 | ret = -EINVAL; |
| 1372 | if (j != number) { |
| 1373 | duprintf("translate_compat_table: %u not %u entries\n", |
| 1374 | j, number); |
| 1375 | goto out_unlock; |
| 1376 | } |
| 1377 | |
| 1378 | /* Check hooks all assigned */ |
| 1379 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 1380 | /* Only hooks which are valid */ |
| 1381 | if (!(valid_hooks & (1 << i))) |
| 1382 | continue; |
| 1383 | if (info->hook_entry[i] == 0xFFFFFFFF) { |
| 1384 | duprintf("Invalid hook entry %u %u\n", |
| 1385 | i, hook_entries[i]); |
| 1386 | goto out_unlock; |
| 1387 | } |
| 1388 | if (info->underflow[i] == 0xFFFFFFFF) { |
| 1389 | duprintf("Invalid underflow %u %u\n", |
| 1390 | i, underflows[i]); |
| 1391 | goto out_unlock; |
| 1392 | } |
| 1393 | } |
| 1394 | |
| 1395 | ret = -ENOMEM; |
| 1396 | newinfo = xt_alloc_table_info(size); |
| 1397 | if (!newinfo) |
| 1398 | goto out_unlock; |
| 1399 | |
| 1400 | newinfo->number = number; |
| 1401 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 1402 | newinfo->hook_entry[i] = info->hook_entry[i]; |
| 1403 | newinfo->underflow[i] = info->underflow[i]; |
| 1404 | } |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1405 | entry1 = newinfo->entries; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1406 | pos = entry1; |
| 1407 | size = total_size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1408 | xt_entry_foreach(iter0, entry0, total_size) { |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1409 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
| 1410 | name, newinfo, entry1); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1411 | if (ret != 0) |
| 1412 | break; |
| 1413 | } |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1414 | xt_compat_flush_offsets(NFPROTO_ARP); |
| 1415 | xt_compat_unlock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1416 | if (ret) |
| 1417 | goto free_newinfo; |
| 1418 | |
| 1419 | ret = -ELOOP; |
| 1420 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) |
| 1421 | goto free_newinfo; |
| 1422 | |
| 1423 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1424 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1425 | iter1->counters.pcnt = xt_percpu_counter_alloc(); |
| 1426 | if (IS_ERR_VALUE(iter1->counters.pcnt)) { |
| 1427 | ret = -ENOMEM; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1428 | break; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1429 | } |
| 1430 | |
| 1431 | ret = check_target(iter1, name); |
| 1432 | if (ret != 0) { |
| 1433 | xt_percpu_counter_free(iter1->counters.pcnt); |
| 1434 | break; |
| 1435 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1436 | ++i; |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 1437 | if (strcmp(arpt_get_target(iter1)->u.user.name, |
| 1438 | XT_ERROR_TARGET) == 0) |
| 1439 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1440 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1441 | if (ret) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1442 | /* |
| 1443 | * The first i matches need cleanup_entry (calls ->destroy) |
| 1444 | * because they had called ->check already. The other j-i |
| 1445 | * entries need only release. |
| 1446 | */ |
| 1447 | int skip = i; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1448 | j -= i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1449 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
| 1450 | if (skip-- > 0) |
| 1451 | continue; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1452 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1453 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1454 | compat_release_entry(iter0); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1455 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1456 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
| 1457 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1458 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1459 | cleanup_entry(iter1); |
| 1460 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1461 | xt_free_table_info(newinfo); |
| 1462 | return ret; |
| 1463 | } |
| 1464 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1465 | *pinfo = newinfo; |
| 1466 | *pentry0 = entry1; |
| 1467 | xt_free_table_info(info); |
| 1468 | return 0; |
| 1469 | |
| 1470 | free_newinfo: |
| 1471 | xt_free_table_info(newinfo); |
| 1472 | out: |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1473 | xt_entry_foreach(iter0, entry0, total_size) { |
| 1474 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1475 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1476 | compat_release_entry(iter0); |
| 1477 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1478 | return ret; |
| 1479 | out_unlock: |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1480 | xt_compat_flush_offsets(NFPROTO_ARP); |
| 1481 | xt_compat_unlock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1482 | goto out; |
| 1483 | } |
| 1484 | |
| 1485 | struct compat_arpt_replace { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1486 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1487 | u32 valid_hooks; |
| 1488 | u32 num_entries; |
| 1489 | u32 size; |
| 1490 | u32 hook_entry[NF_ARP_NUMHOOKS]; |
| 1491 | u32 underflow[NF_ARP_NUMHOOKS]; |
| 1492 | u32 num_counters; |
| 1493 | compat_uptr_t counters; |
| 1494 | struct compat_arpt_entry entries[0]; |
| 1495 | }; |
| 1496 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1497 | static int compat_do_replace(struct net *net, void __user *user, |
| 1498 | unsigned int len) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1499 | { |
| 1500 | int ret; |
| 1501 | struct compat_arpt_replace tmp; |
| 1502 | struct xt_table_info *newinfo; |
| 1503 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1504 | struct arpt_entry *iter; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1505 | |
| 1506 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1507 | return -EFAULT; |
| 1508 | |
| 1509 | /* overflow check */ |
| 1510 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
| 1511 | return -ENOMEM; |
| 1512 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1513 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1514 | if (tmp.num_counters == 0) |
| 1515 | return -EINVAL; |
| 1516 | |
Vasiliy Kulikov | 42eab94 | 2011-03-15 13:35:21 +0100 | [diff] [blame] | 1517 | tmp.name[sizeof(tmp.name)-1] = 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1518 | |
| 1519 | newinfo = xt_alloc_table_info(tmp.size); |
| 1520 | if (!newinfo) |
| 1521 | return -ENOMEM; |
| 1522 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1523 | loc_cpu_entry = newinfo->entries; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1524 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) { |
| 1525 | ret = -EFAULT; |
| 1526 | goto free_newinfo; |
| 1527 | } |
| 1528 | |
| 1529 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
| 1530 | &newinfo, &loc_cpu_entry, tmp.size, |
| 1531 | tmp.num_entries, tmp.hook_entry, |
| 1532 | tmp.underflow); |
| 1533 | if (ret != 0) |
| 1534 | goto free_newinfo; |
| 1535 | |
| 1536 | duprintf("compat_do_replace: Translated table\n"); |
| 1537 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1538 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1539 | tmp.num_counters, compat_ptr(tmp.counters)); |
| 1540 | if (ret) |
| 1541 | goto free_newinfo_untrans; |
| 1542 | return 0; |
| 1543 | |
| 1544 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1545 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1546 | cleanup_entry(iter); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1547 | free_newinfo: |
| 1548 | xt_free_table_info(newinfo); |
| 1549 | return ret; |
| 1550 | } |
| 1551 | |
| 1552 | static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, |
| 1553 | unsigned int len) |
| 1554 | { |
| 1555 | int ret; |
| 1556 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1557 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1558 | return -EPERM; |
| 1559 | |
| 1560 | switch (cmd) { |
| 1561 | case ARPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1562 | ret = compat_do_replace(sock_net(sk), user, len); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1563 | break; |
| 1564 | |
| 1565 | case ARPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1566 | ret = do_add_counters(sock_net(sk), user, len, 1); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1567 | break; |
| 1568 | |
| 1569 | default: |
| 1570 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); |
| 1571 | ret = -EINVAL; |
| 1572 | } |
| 1573 | |
| 1574 | return ret; |
| 1575 | } |
| 1576 | |
| 1577 | static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr, |
| 1578 | compat_uint_t *size, |
| 1579 | struct xt_counters *counters, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1580 | unsigned int i) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1581 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1582 | struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1583 | struct compat_arpt_entry __user *ce; |
| 1584 | u_int16_t target_offset, next_offset; |
| 1585 | compat_uint_t origsize; |
| 1586 | int ret; |
| 1587 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1588 | origsize = *size; |
| 1589 | ce = (struct compat_arpt_entry __user *)*dstptr; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1590 | if (copy_to_user(ce, e, sizeof(struct arpt_entry)) != 0 || |
| 1591 | copy_to_user(&ce->counters, &counters[i], |
| 1592 | sizeof(counters[i])) != 0) |
| 1593 | return -EFAULT; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1594 | |
| 1595 | *dstptr += sizeof(struct compat_arpt_entry); |
| 1596 | *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); |
| 1597 | |
| 1598 | target_offset = e->target_offset - (origsize - *size); |
| 1599 | |
| 1600 | t = arpt_get_target(e); |
| 1601 | ret = xt_compat_target_to_user(t, dstptr, size); |
| 1602 | if (ret) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1603 | return ret; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1604 | next_offset = e->next_offset - (origsize - *size); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1605 | if (put_user(target_offset, &ce->target_offset) != 0 || |
| 1606 | put_user(next_offset, &ce->next_offset) != 0) |
| 1607 | return -EFAULT; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1608 | return 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1609 | } |
| 1610 | |
| 1611 | static int compat_copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1612 | struct xt_table *table, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1613 | void __user *userptr) |
| 1614 | { |
| 1615 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1616 | const struct xt_table_info *private = table->private; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1617 | void __user *pos; |
| 1618 | unsigned int size; |
| 1619 | int ret = 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1620 | unsigned int i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1621 | struct arpt_entry *iter; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1622 | |
| 1623 | counters = alloc_counters(table); |
| 1624 | if (IS_ERR(counters)) |
| 1625 | return PTR_ERR(counters); |
| 1626 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1627 | pos = userptr; |
| 1628 | size = total_size; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1629 | xt_entry_foreach(iter, private->entries, total_size) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1630 | ret = compat_copy_entry_to_user(iter, &pos, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1631 | &size, counters, i++); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1632 | if (ret != 0) |
| 1633 | break; |
| 1634 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1635 | vfree(counters); |
| 1636 | return ret; |
| 1637 | } |
| 1638 | |
| 1639 | struct compat_arpt_get_entries { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1640 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1641 | compat_uint_t size; |
| 1642 | struct compat_arpt_entry entrytable[0]; |
| 1643 | }; |
| 1644 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1645 | static int compat_get_entries(struct net *net, |
| 1646 | struct compat_arpt_get_entries __user *uptr, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1647 | int *len) |
| 1648 | { |
| 1649 | int ret; |
| 1650 | struct compat_arpt_get_entries get; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1651 | struct xt_table *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1652 | |
| 1653 | if (*len < sizeof(get)) { |
| 1654 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
| 1655 | return -EINVAL; |
| 1656 | } |
| 1657 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1658 | return -EFAULT; |
| 1659 | if (*len != sizeof(struct compat_arpt_get_entries) + get.size) { |
| 1660 | duprintf("compat_get_entries: %u != %zu\n", |
| 1661 | *len, sizeof(get) + get.size); |
| 1662 | return -EINVAL; |
| 1663 | } |
| 1664 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1665 | xt_compat_lock(NFPROTO_ARP); |
| 1666 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1667 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1668 | const struct xt_table_info *private = t->private; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1669 | struct xt_table_info info; |
| 1670 | |
| 1671 | duprintf("t->private->number = %u\n", private->number); |
| 1672 | ret = compat_table_info(private, &info); |
| 1673 | if (!ret && get.size == info.size) { |
| 1674 | ret = compat_copy_entries_to_user(private->size, |
| 1675 | t, uptr->entrytable); |
| 1676 | } else if (!ret) { |
| 1677 | duprintf("compat_get_entries: I've got %u not %u!\n", |
| 1678 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1679 | ret = -EAGAIN; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1680 | } |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1681 | xt_compat_flush_offsets(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1682 | module_put(t->me); |
| 1683 | xt_table_unlock(t); |
| 1684 | } else |
| 1685 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1686 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1687 | xt_compat_unlock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1688 | return ret; |
| 1689 | } |
| 1690 | |
| 1691 | static int do_arpt_get_ctl(struct sock *, int, void __user *, int *); |
| 1692 | |
| 1693 | static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, |
| 1694 | int *len) |
| 1695 | { |
| 1696 | int ret; |
| 1697 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1698 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1699 | return -EPERM; |
| 1700 | |
| 1701 | switch (cmd) { |
| 1702 | case ARPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1703 | ret = get_info(sock_net(sk), user, len, 1); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1704 | break; |
| 1705 | case ARPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1706 | ret = compat_get_entries(sock_net(sk), user, len); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1707 | break; |
| 1708 | default: |
| 1709 | ret = do_arpt_get_ctl(sk, cmd, user, len); |
| 1710 | } |
| 1711 | return ret; |
| 1712 | } |
| 1713 | #endif |
| 1714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
| 1716 | { |
| 1717 | int ret; |
| 1718 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1719 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | return -EPERM; |
| 1721 | |
| 1722 | switch (cmd) { |
| 1723 | case ARPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1724 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | break; |
| 1726 | |
| 1727 | case ARPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1728 | ret = do_add_counters(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | break; |
| 1730 | |
| 1731 | default: |
| 1732 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); |
| 1733 | ret = -EINVAL; |
| 1734 | } |
| 1735 | |
| 1736 | return ret; |
| 1737 | } |
| 1738 | |
| 1739 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1740 | { |
| 1741 | int ret; |
| 1742 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1743 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | return -EPERM; |
| 1745 | |
| 1746 | switch (cmd) { |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 1747 | case ARPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1748 | ret = get_info(sock_net(sk), user, len, 0); |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 1749 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 1751 | case ARPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1752 | ret = get_entries(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1755 | case ARPT_SO_GET_REVISION_TARGET: { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1756 | struct xt_get_revision rev; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1757 | |
| 1758 | if (*len != sizeof(rev)) { |
| 1759 | ret = -EINVAL; |
| 1760 | break; |
| 1761 | } |
| 1762 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 1763 | ret = -EFAULT; |
| 1764 | break; |
| 1765 | } |
Vasiliy Kulikov | 42eab94 | 2011-03-15 13:35:21 +0100 | [diff] [blame] | 1766 | rev.name[sizeof(rev.name)-1] = 0; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1767 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1768 | try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1769 | rev.revision, 1, &ret), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1770 | "arpt_%s", rev.name); |
| 1771 | break; |
| 1772 | } |
| 1773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | default: |
| 1775 | duprintf("do_arpt_get_ctl: unknown request %i\n", cmd); |
| 1776 | ret = -EINVAL; |
| 1777 | } |
| 1778 | |
| 1779 | return ret; |
| 1780 | } |
| 1781 | |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 1782 | struct xt_table *arpt_register_table(struct net *net, |
| 1783 | const struct xt_table *table, |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1784 | const struct arpt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | { |
| 1786 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1787 | struct xt_table_info *newinfo; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 1788 | struct xt_table_info bootstrap = {0}; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1789 | void *loc_cpu_entry; |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 1790 | struct xt_table *new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1792 | newinfo = xt_alloc_table_info(repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | if (!newinfo) { |
| 1794 | ret = -ENOMEM; |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1795 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | } |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1797 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1798 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1799 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 1801 | ret = translate_table(newinfo, loc_cpu_entry, repl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | duprintf("arpt_register_table: translate table gives %d\n", ret); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1803 | if (ret != 0) |
| 1804 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1806 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 1807 | if (IS_ERR(new_table)) { |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1808 | ret = PTR_ERR(new_table); |
| 1809 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | } |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1811 | return new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1813 | out_free: |
| 1814 | xt_free_table_info(newinfo); |
| 1815 | out: |
| 1816 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | } |
| 1818 | |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1819 | void arpt_unregister_table(struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1821 | struct xt_table_info *private; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1822 | void *loc_cpu_entry; |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 1823 | struct module *table_owner = table->me; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1824 | struct arpt_entry *iter; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1825 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1826 | private = xt_unregister_table(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
| 1828 | /* Decrease module usage counts and free resources */ |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1829 | loc_cpu_entry = private->entries; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1830 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1831 | cleanup_entry(iter); |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 1832 | if (private->number > private->initial_entries) |
| 1833 | module_put(table_owner); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1834 | xt_free_table_info(private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | } |
| 1836 | |
| 1837 | /* The built-in targets: standard (NULL) and error. */ |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1838 | static struct xt_target arpt_builtin_tg[] __read_mostly = { |
| 1839 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 1840 | .name = XT_STANDARD_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1841 | .targetsize = sizeof(int), |
| 1842 | .family = NFPROTO_ARP, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1843 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1844 | .compatsize = sizeof(compat_int_t), |
| 1845 | .compat_from_user = compat_standard_from_user, |
| 1846 | .compat_to_user = compat_standard_to_user, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1847 | #endif |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1848 | }, |
| 1849 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 1850 | .name = XT_ERROR_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1851 | .target = arpt_error, |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1852 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1853 | .family = NFPROTO_ARP, |
| 1854 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | }; |
| 1856 | |
| 1857 | static struct nf_sockopt_ops arpt_sockopts = { |
| 1858 | .pf = PF_INET, |
| 1859 | .set_optmin = ARPT_BASE_CTL, |
| 1860 | .set_optmax = ARPT_SO_SET_MAX+1, |
| 1861 | .set = do_arpt_set_ctl, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1862 | #ifdef CONFIG_COMPAT |
| 1863 | .compat_set = compat_do_arpt_set_ctl, |
| 1864 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | .get_optmin = ARPT_BASE_CTL, |
| 1866 | .get_optmax = ARPT_SO_GET_MAX+1, |
| 1867 | .get = do_arpt_get_ctl, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1868 | #ifdef CONFIG_COMPAT |
| 1869 | .compat_get = compat_do_arpt_get_ctl, |
| 1870 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 1871 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | }; |
| 1873 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1874 | static int __net_init arp_tables_net_init(struct net *net) |
| 1875 | { |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1876 | return xt_proto_init(net, NFPROTO_ARP); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1877 | } |
| 1878 | |
| 1879 | static void __net_exit arp_tables_net_exit(struct net *net) |
| 1880 | { |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1881 | xt_proto_fini(net, NFPROTO_ARP); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1882 | } |
| 1883 | |
| 1884 | static struct pernet_operations arp_tables_net_ops = { |
| 1885 | .init = arp_tables_net_init, |
| 1886 | .exit = arp_tables_net_exit, |
| 1887 | }; |
| 1888 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1889 | static int __init arp_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | { |
| 1891 | int ret; |
| 1892 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1893 | ret = register_pernet_subsys(&arp_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1894 | if (ret < 0) |
| 1895 | goto err1; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1896 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1897 | /* 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] | 1898 | ret = xt_register_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1899 | if (ret < 0) |
| 1900 | goto err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | |
| 1902 | /* Register setsockopt */ |
| 1903 | ret = nf_register_sockopt(&arpt_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1904 | if (ret < 0) |
| 1905 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | |
Patrick McHardy | a887c1c | 2007-07-14 20:46:15 -0700 | [diff] [blame] | 1907 | printk(KERN_INFO "arp_tables: (C) 2002 David S. Miller\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1909 | |
| 1910 | err4: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1911 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1912 | err2: |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1913 | unregister_pernet_subsys(&arp_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1914 | err1: |
| 1915 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | } |
| 1917 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1918 | static void __exit arp_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | { |
| 1920 | nf_unregister_sockopt(&arpt_sockopts); |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1921 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1922 | unregister_pernet_subsys(&arp_tables_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | } |
| 1924 | |
| 1925 | EXPORT_SYMBOL(arpt_register_table); |
| 1926 | EXPORT_SYMBOL(arpt_unregister_table); |
| 1927 | EXPORT_SYMBOL(arpt_do_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1928 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1929 | module_init(arp_tables_init); |
| 1930 | module_exit(arp_tables_fini); |