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 | |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 37 | void *arpt_alloc_initial_table(const struct xt_table *info) |
| 38 | { |
| 39 | return xt_alloc_initial_table(arpt, ARPT); |
| 40 | } |
| 41 | EXPORT_SYMBOL_GPL(arpt_alloc_initial_table); |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 44 | const char *hdr_addr, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | { |
| 46 | int i, ret; |
| 47 | |
| 48 | if (len > ARPT_DEV_ADDR_LEN_MAX) |
| 49 | len = ARPT_DEV_ADDR_LEN_MAX; |
| 50 | |
| 51 | ret = 0; |
| 52 | for (i = 0; i < len; i++) |
| 53 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; |
| 54 | |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 55 | return ret != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | } |
| 57 | |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 58 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 59 | * 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] | 60 | * Some arches dont care, unrolling the loop is a win on them. |
Eric Dumazet | 35c7f6d | 2009-03-24 14:15:22 -0700 | [diff] [blame] | 61 | * For other arches, we only have a 16bit alignement. |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 62 | */ |
| 63 | static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask) |
| 64 | { |
| 65 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 66 | unsigned long ret = ifname_compare_aligned(_a, _b, _mask); |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 67 | #else |
| 68 | unsigned long ret = 0; |
Eric Dumazet | 35c7f6d | 2009-03-24 14:15:22 -0700 | [diff] [blame] | 69 | const u16 *a = (const u16 *)_a; |
| 70 | const u16 *b = (const u16 *)_b; |
| 71 | const u16 *mask = (const u16 *)_mask; |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 72 | int i; |
| 73 | |
Eric Dumazet | 35c7f6d | 2009-03-24 14:15:22 -0700 | [diff] [blame] | 74 | for (i = 0; i < IFNAMSIZ/sizeof(u16); i++) |
| 75 | ret |= (a[i] ^ b[i]) & mask[i]; |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 76 | #endif |
| 77 | return ret; |
| 78 | } |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | /* Returns whether packet matches rule or not. */ |
| 81 | static inline int arp_packet_match(const struct arphdr *arphdr, |
| 82 | struct net_device *dev, |
| 83 | const char *indev, |
| 84 | const char *outdev, |
| 85 | const struct arpt_arp *arpinfo) |
| 86 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 87 | const char *arpptr = (char *)(arphdr + 1); |
| 88 | const char *src_devaddr, *tgt_devaddr; |
Al Viro | 59b8bfd | 2006-09-28 14:21:07 -0700 | [diff] [blame] | 89 | __be32 src_ipaddr, tgt_ipaddr; |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 90 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 92 | if (NF_INVF(arpinfo, ARPT_INV_ARPOP, |
| 93 | (arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 96 | if (NF_INVF(arpinfo, ARPT_INV_ARPHRD, |
| 97 | (arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 100 | if (NF_INVF(arpinfo, ARPT_INV_ARPPRO, |
| 101 | (arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 104 | if (NF_INVF(arpinfo, ARPT_INV_ARPHLN, |
| 105 | (arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
| 108 | src_devaddr = arpptr; |
| 109 | arpptr += dev->addr_len; |
| 110 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); |
| 111 | arpptr += sizeof(u32); |
| 112 | tgt_devaddr = arpptr; |
| 113 | arpptr += dev->addr_len; |
| 114 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); |
| 115 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 116 | if (NF_INVF(arpinfo, ARPT_INV_SRCDEVADDR, |
| 117 | arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, |
| 118 | dev->addr_len)) || |
| 119 | NF_INVF(arpinfo, ARPT_INV_TGTDEVADDR, |
| 120 | arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, |
| 121 | dev->addr_len))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 124 | if (NF_INVF(arpinfo, ARPT_INV_SRCIP, |
| 125 | (src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr) || |
| 126 | NF_INVF(arpinfo, ARPT_INV_TGTIP, |
| 127 | (tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | /* Look for ifname matches. */ |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 131 | ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 133 | if (NF_INVF(arpinfo, ARPT_INV_VIA_IN, ret != 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 136 | ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Joe Perches | c37a2df | 2016-06-24 13:25:22 -0700 | [diff] [blame] | 138 | if (NF_INVF(arpinfo, ARPT_INV_VIA_OUT, ret != 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | return 1; |
| 142 | } |
| 143 | |
| 144 | static inline int arp_checkentry(const struct arpt_arp *arp) |
| 145 | { |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 146 | if (arp->flags & ~ARPT_F_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | return 0; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 148 | if (arp->invflags & ~ARPT_INV_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | return 1; |
| 152 | } |
| 153 | |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 154 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 155 | arpt_error(struct sk_buff *skb, const struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 157 | net_err_ratelimited("arp_tables: error: '%s'\n", |
| 158 | (const char *)par->targinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | return NF_DROP; |
| 161 | } |
| 162 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 163 | static inline const struct xt_entry_target * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 164 | arpt_get_target_c(const struct arpt_entry *e) |
| 165 | { |
| 166 | return arpt_get_target((struct arpt_entry *)e); |
| 167 | } |
| 168 | |
| 169 | static inline struct arpt_entry * |
| 170 | get_entry(const void *base, unsigned int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
| 172 | return (struct arpt_entry *)(base + offset); |
| 173 | } |
| 174 | |
Florian Westphal | 6c7941d | 2015-07-14 17:51:10 +0200 | [diff] [blame] | 175 | static inline |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 176 | struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry) |
| 177 | { |
| 178 | return (void *)entry + entry->next_offset; |
| 179 | } |
| 180 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 181 | unsigned int arpt_do_table(struct sk_buff *skb, |
David S. Miller | b85c3dc | 2015-04-03 21:18:46 -0400 | [diff] [blame] | 182 | const struct nf_hook_state *state, |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 183 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
Eric W. Biederman | 6cb8ff3f1 | 2015-09-18 14:32:55 -0500 | [diff] [blame] | 185 | unsigned int hook = state->hook; |
Eric Dumazet | ddc214c | 2009-02-18 17:47:50 +0100 | [diff] [blame] | 186 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | unsigned int verdict = NF_DROP; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 188 | const struct arphdr *arp; |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 189 | struct arpt_entry *e, **jumpstack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | const char *indev, *outdev; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 191 | const void *table_base; |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 192 | unsigned int cpu, stackidx = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 193 | const struct xt_table_info *private; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 194 | struct xt_action_param acpar; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 195 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Pavel Emelyanov | 988b705 | 2008-03-03 12:20:57 -0800 | [diff] [blame] | 197 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | return NF_DROP; |
| 199 | |
David S. Miller | b85c3dc | 2015-04-03 21:18:46 -0400 | [diff] [blame] | 200 | indev = state->in ? state->in->name : nulldevname; |
| 201 | outdev = state->out ? state->out->name : nulldevname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 203 | local_bh_disable(); |
| 204 | addend = xt_write_recseq_begin(); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 205 | private = table->private; |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 206 | cpu = smp_processor_id(); |
Will Deacon | b416c14 | 2013-10-21 13:14:53 +0100 | [diff] [blame] | 207 | /* |
| 208 | * Ensure we load private-> members after we've fetched the base |
| 209 | * pointer. |
| 210 | */ |
| 211 | smp_read_barrier_depends(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 212 | table_base = private->entries; |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 213 | jumpstack = (struct arpt_entry **)private->jumpstack[cpu]; |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 214 | |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 215 | /* No TEE support for arptables, so no need to switch to alternate |
| 216 | * stack. All targets that reenter must return absolute verdicts. |
| 217 | */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 218 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
Eric W. Biederman | 156c196 | 2015-09-18 14:32:58 -0500 | [diff] [blame] | 220 | acpar.net = state->net; |
David S. Miller | b85c3dc | 2015-04-03 21:18:46 -0400 | [diff] [blame] | 221 | acpar.in = state->in; |
| 222 | acpar.out = state->out; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 223 | acpar.hooknum = hook; |
| 224 | acpar.family = NFPROTO_ARP; |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 225 | acpar.hotdrop = false; |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 226 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 227 | arp = arp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | do { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 229 | const struct xt_entry_target *t; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 230 | struct xt_counters *counter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 232 | if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) { |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 233 | e = arpt_next_entry(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 234 | continue; |
| 235 | } |
| 236 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 237 | counter = xt_get_this_cpu_counter(&e->counters); |
| 238 | ADD_COUNTER(*counter, arp_hdr_len(skb->dev), 1); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 239 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 240 | t = arpt_get_target_c(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 241 | |
| 242 | /* Standard target? */ |
| 243 | if (!t->u.kernel.target->target) { |
| 244 | int v; |
| 245 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 246 | v = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 247 | if (v < 0) { |
| 248 | /* Pop from stack? */ |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 249 | if (v != XT_RETURN) { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 250 | verdict = (unsigned int)(-v) - 1; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 251 | break; |
| 252 | } |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 253 | if (stackidx == 0) { |
| 254 | e = get_entry(table_base, |
| 255 | private->underflow[hook]); |
| 256 | } else { |
| 257 | e = jumpstack[--stackidx]; |
| 258 | e = arpt_next_entry(e); |
| 259 | } |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 260 | continue; |
| 261 | } |
| 262 | if (table_base + v |
| 263 | != arpt_next_entry(e)) { |
Florian Westphal | f506da5 | 2018-02-07 13:46:25 +0100 | [diff] [blame] | 264 | if (unlikely(stackidx >= private->stacksize)) { |
| 265 | verdict = NF_DROP; |
| 266 | break; |
| 267 | } |
Florian Westphal | 3bd2299 | 2015-06-30 22:21:00 +0200 | [diff] [blame] | 268 | jumpstack[stackidx++] = e; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | e = get_entry(table_base, v); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 272 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 274 | |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 275 | acpar.target = t->u.kernel.target; |
| 276 | acpar.targinfo = t->data; |
| 277 | verdict = t->u.kernel.target->target(skb, &acpar); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 278 | |
| 279 | /* Target might have changed stuff. */ |
| 280 | arp = arp_hdr(skb); |
| 281 | |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 282 | if (verdict == XT_CONTINUE) |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 283 | e = arpt_next_entry(e); |
| 284 | else |
| 285 | /* Verdict */ |
| 286 | break; |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 287 | } while (!acpar.hotdrop); |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 288 | xt_write_recseq_end(addend); |
| 289 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 291 | if (acpar.hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | return NF_DROP; |
| 293 | else |
| 294 | return verdict; |
| 295 | } |
| 296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | /* All zeroes == unconditional rule. */ |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 298 | static inline bool unconditional(const struct arpt_entry *e) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 300 | static const struct arpt_arp uncond; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 302 | return e->target_offset == sizeof(struct arpt_entry) && |
| 303 | memcmp(&e->arp, &uncond, sizeof(uncond)) == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | /* Figures out from what hook each rule can be called: returns 0 if |
| 307 | * there are loops. Puts hook bitmask in comefrom. |
| 308 | */ |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 309 | static int mark_source_chains(const struct xt_table_info *newinfo, |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 310 | unsigned int valid_hooks, void *entry0, |
| 311 | unsigned int *offsets) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | { |
| 313 | unsigned int hook; |
| 314 | |
| 315 | /* No recursion; use packet counter to save back ptrs (reset |
| 316 | * to 0 as we leave), and comefrom to save source hook bitmask. |
| 317 | */ |
| 318 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { |
| 319 | unsigned int pos = newinfo->hook_entry[hook]; |
| 320 | struct arpt_entry *e |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 321 | = (struct arpt_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | if (!(valid_hooks & (1 << hook))) |
| 324 | continue; |
| 325 | |
| 326 | /* Set initial back pointer. */ |
| 327 | e->counters.pcnt = pos; |
| 328 | |
| 329 | for (;;) { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 330 | const struct xt_standard_target *t |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 331 | = (void *)arpt_get_target_c(e); |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 332 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 334 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | return 0; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | e->comefrom |
| 338 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); |
| 339 | |
| 340 | /* Unconditional return/END. */ |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 341 | if ((unconditional(e) && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 342 | (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 343 | XT_STANDARD_TARGET) == 0) && |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 344 | t->verdict < 0) || visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | unsigned int oldpos, size; |
| 346 | |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 347 | if ((strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 348 | XT_STANDARD_TARGET) == 0) && |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 349 | t->verdict < -NF_MAX_VERDICT - 1) |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 350 | return 0; |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | /* Return: backtrack through the last |
| 353 | * big jump. |
| 354 | */ |
| 355 | do { |
| 356 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); |
| 357 | oldpos = pos; |
| 358 | pos = e->counters.pcnt; |
| 359 | e->counters.pcnt = 0; |
| 360 | |
| 361 | /* We're at the start. */ |
| 362 | if (pos == oldpos) |
| 363 | goto next; |
| 364 | |
| 365 | e = (struct arpt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 366 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } while (oldpos == pos + e->next_offset); |
| 368 | |
| 369 | /* Move along one */ |
| 370 | size = e->next_offset; |
| 371 | e = (struct arpt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 372 | (entry0 + pos + size); |
Florian Westphal | f24e230 | 2016-04-01 14:17:21 +0200 | [diff] [blame] | 373 | if (pos + size >= newinfo->size) |
| 374 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | e->counters.pcnt = pos; |
| 376 | pos += size; |
| 377 | } else { |
| 378 | int newpos = t->verdict; |
| 379 | |
| 380 | if (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 381 | XT_STANDARD_TARGET) == 0 && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 382 | newpos >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | /* This a jump; chase it. */ |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 384 | if (!xt_find_jump_offset(offsets, newpos, |
| 385 | newinfo->number)) |
| 386 | return 0; |
Florian Westphal | 3647234 | 2016-04-01 14:17:22 +0200 | [diff] [blame] | 387 | e = (struct arpt_entry *) |
| 388 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } else { |
| 390 | /* ... this is a fallthru */ |
| 391 | newpos = pos + e->next_offset; |
Florian Westphal | f24e230 | 2016-04-01 14:17:21 +0200 | [diff] [blame] | 392 | if (newpos >= newinfo->size) |
| 393 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
| 395 | e = (struct arpt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 396 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | e->counters.pcnt = pos; |
| 398 | pos = newpos; |
| 399 | } |
| 400 | } |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 401 | next: ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } |
| 403 | return 1; |
| 404 | } |
| 405 | |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 406 | static int check_target(struct arpt_entry *e, struct net *net, const char *name) |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 407 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 408 | struct xt_entry_target *t = arpt_get_target(e); |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 409 | struct xt_tgchk_param par = { |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 410 | .net = net, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 411 | .table = name, |
| 412 | .entryinfo = e, |
| 413 | .target = t->u.kernel.target, |
| 414 | .targinfo = t->data, |
| 415 | .hook_mask = e->comefrom, |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 416 | .family = NFPROTO_ARP, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 417 | }; |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 418 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 419 | return xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 420 | } |
| 421 | |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 422 | static int |
| 423 | find_check_entry(struct arpt_entry *e, struct net *net, const char *name, |
| 424 | unsigned int size, |
Florian Westphal | db6a0cb | 2016-11-22 14:44:19 +0100 | [diff] [blame] | 425 | struct xt_percpu_counter_alloc_state *alloc_state) |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 426 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 427 | struct xt_entry_target *t; |
Jan Engelhardt | 95eea85 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 428 | struct xt_target *target; |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 429 | int ret; |
| 430 | |
Florian Westphal | db6a0cb | 2016-11-22 14:44:19 +0100 | [diff] [blame] | 431 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 432 | return -ENOMEM; |
| 433 | |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 434 | t = arpt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 435 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
| 436 | t->u.user.revision); |
| 437 | if (IS_ERR(target)) { |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 438 | ret = PTR_ERR(target); |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 439 | goto out; |
| 440 | } |
| 441 | t->u.kernel.target = target; |
| 442 | |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 443 | ret = check_target(e, net, name); |
Patrick McHardy | fb5b609 | 2007-12-17 21:56:33 -0800 | [diff] [blame] | 444 | if (ret) |
| 445 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 447 | err: |
| 448 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | out: |
Florian Westphal | 61346e2 | 2016-11-22 14:44:17 +0100 | [diff] [blame] | 450 | xt_percpu_counter_free(&e->counters); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | return ret; |
| 453 | } |
| 454 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 455 | static bool check_underflow(const struct arpt_entry *e) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 456 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 457 | const struct xt_entry_target *t; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 458 | unsigned int verdict; |
| 459 | |
Florian Westphal | 54d83fc | 2016-03-22 18:02:52 +0100 | [diff] [blame] | 460 | if (!unconditional(e)) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 461 | return false; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 462 | t = arpt_get_target_c(e); |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 463 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
| 464 | return false; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 465 | verdict = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 466 | verdict = -verdict - 1; |
| 467 | return verdict == NF_DROP || verdict == NF_ACCEPT; |
| 468 | } |
| 469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 471 | struct xt_table_info *newinfo, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 472 | const unsigned char *base, |
| 473 | const unsigned char *limit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | const unsigned int *hook_entries, |
| 475 | const unsigned int *underflows, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 476 | unsigned int valid_hooks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
| 478 | unsigned int h; |
Florian Westphal | bdf533d | 2016-03-22 18:02:49 +0100 | [diff] [blame] | 479 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 481 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 || |
Florian Westphal | 6e94e0c | 2016-03-22 18:02:50 +0100 | [diff] [blame] | 482 | (unsigned char *)e + sizeof(struct arpt_entry) >= limit || |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 483 | (unsigned char *)e + e->next_offset > limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
| 486 | if (e->next_offset |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 487 | < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
Florian Westphal | aa412ba | 2016-04-01 14:17:24 +0200 | [diff] [blame] | 490 | if (!arp_checkentry(&e->arp)) |
| 491 | return -EINVAL; |
| 492 | |
Florian Westphal | ce683e5 | 2016-04-01 14:17:28 +0200 | [diff] [blame] | 493 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
| 494 | e->next_offset); |
Florian Westphal | bdf533d | 2016-03-22 18:02:49 +0100 | [diff] [blame] | 495 | if (err) |
| 496 | return err; |
| 497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | /* Check hooks & underflows */ |
| 499 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { |
Jan Engelhardt | a7d5173 | 2009-07-18 14:52:58 +0200 | [diff] [blame] | 500 | if (!(valid_hooks & (1 << h))) |
| 501 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | if ((unsigned char *)e - base == hook_entries[h]) |
| 503 | newinfo->hook_entry[h] = hook_entries[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 504 | if ((unsigned char *)e - base == underflows[h]) { |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 505 | if (!check_underflow(e)) |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 506 | return -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 507 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | newinfo->underflow[h] = underflows[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 509 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 513 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | e->comefrom = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | return 0; |
| 516 | } |
| 517 | |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 518 | static void cleanup_entry(struct arpt_entry *e, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 520 | struct xt_tgdtor_param par; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 521 | struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | t = arpt_get_target(e); |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 524 | par.net = net; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 525 | par.target = t->u.kernel.target; |
| 526 | par.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 527 | par.family = NFPROTO_ARP; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 528 | if (par.target->destroy != NULL) |
| 529 | par.target->destroy(&par); |
| 530 | module_put(par.target->me); |
Florian Westphal | 61346e2 | 2016-11-22 14:44:17 +0100 | [diff] [blame] | 531 | xt_percpu_counter_free(&e->counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | /* Checks and translates the user-supplied table segment (held in |
| 535 | * newinfo). |
| 536 | */ |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 537 | static int translate_table(struct net *net, |
| 538 | struct xt_table_info *newinfo, |
| 539 | void *entry0, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 540 | const struct arpt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
Florian Westphal | db6a0cb | 2016-11-22 14:44:19 +0100 | [diff] [blame] | 542 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 543 | struct arpt_entry *iter; |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 544 | unsigned int *offsets; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | unsigned int i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 546 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 548 | newinfo->size = repl->size; |
| 549 | newinfo->number = repl->num_entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
| 551 | /* Init all hooks to impossible value. */ |
| 552 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 553 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 554 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 555 | } |
| 556 | |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 557 | offsets = xt_alloc_entry_offsets(newinfo->number); |
| 558 | if (!offsets) |
| 559 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | i = 0; |
| 561 | |
| 562 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 563 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 564 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 565 | entry0 + repl->size, |
| 566 | repl->hook_entry, |
| 567 | repl->underflow, |
| 568 | repl->valid_hooks); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 569 | if (ret != 0) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 570 | goto out_free; |
| 571 | if (i < repl->num_entries) |
| 572 | offsets[i] = (void *)iter - entry0; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 573 | ++i; |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 574 | if (strcmp(arpt_get_target(iter)->u.user.name, |
| 575 | XT_ERROR_TARGET) == 0) |
| 576 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 577 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | if (ret != 0) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 579 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 581 | ret = -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 582 | if (i != repl->num_entries) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 583 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
| 585 | /* Check hooks all assigned */ |
| 586 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 587 | /* Only hooks which are valid */ |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 588 | if (!(repl->valid_hooks & (1 << i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | continue; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 590 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 591 | goto out_free; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 592 | if (newinfo->underflow[i] == 0xFFFFFFFF) |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 593 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | } |
| 595 | |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 596 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
| 597 | ret = -ELOOP; |
| 598 | goto out_free; |
| 599 | } |
| 600 | kvfree(offsets); |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | /* Finally, each sanity check must pass */ |
| 603 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 604 | xt_entry_foreach(iter, entry0, newinfo->size) { |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 605 | ret = find_check_entry(iter, net, repl->name, repl->size, |
Florian Westphal | db6a0cb | 2016-11-22 14:44:19 +0100 | [diff] [blame] | 606 | &alloc_state); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 607 | if (ret != 0) |
| 608 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 609 | ++i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 610 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 612 | if (ret != 0) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 613 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 614 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 615 | break; |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 616 | cleanup_entry(iter, net); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 617 | } |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 618 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | return ret; |
Florian Westphal | f4dc777 | 2016-07-14 17:51:26 +0200 | [diff] [blame] | 622 | out_free: |
| 623 | kvfree(offsets); |
| 624 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 627 | static void get_counters(const struct xt_table_info *t, |
| 628 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 630 | struct arpt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | unsigned int cpu; |
| 632 | unsigned int i; |
| 633 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 634 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 635 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 636 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | i = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 638 | xt_entry_foreach(iter, t->entries, t->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 639 | struct xt_counters *tmp; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 640 | u64 bcnt, pcnt; |
| 641 | unsigned int start; |
| 642 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 643 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 644 | do { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 645 | start = read_seqcount_begin(s); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 646 | bcnt = tmp->bcnt; |
| 647 | pcnt = tmp->pcnt; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 648 | } while (read_seqcount_retry(s, start)); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 649 | |
| 650 | ADD_COUNTER(counters[i], bcnt, pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 651 | ++i; |
| 652 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 654 | } |
| 655 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 656 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | { |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 658 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 659 | struct xt_counters *counters; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 660 | const struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
| 662 | /* We need atomic snapshot of counters: rest doesn't change |
| 663 | * (other than comefrom, which userspace doesn't care |
| 664 | * about). |
| 665 | */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 666 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 667 | counters = vzalloc(countersize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
| 669 | if (counters == NULL) |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 670 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 672 | get_counters(private, counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 674 | return counters; |
| 675 | } |
| 676 | |
| 677 | static int copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 678 | const struct xt_table *table, |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 679 | void __user *userptr) |
| 680 | { |
| 681 | unsigned int off, num; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 682 | const struct arpt_entry *e; |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 683 | struct xt_counters *counters; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 684 | struct xt_table_info *private = table->private; |
Patrick McHardy | 27e2c26 | 2007-12-17 21:56:48 -0800 | [diff] [blame] | 685 | int ret = 0; |
| 686 | void *loc_cpu_entry; |
| 687 | |
| 688 | counters = alloc_counters(table); |
| 689 | if (IS_ERR(counters)) |
| 690 | return PTR_ERR(counters); |
| 691 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 692 | loc_cpu_entry = private->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 693 | /* ... then copy entire thing ... */ |
| 694 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | ret = -EFAULT; |
| 696 | goto free_counters; |
| 697 | } |
| 698 | |
| 699 | /* FIXME: use iterator macros --RR */ |
| 700 | /* ... then go back and fix counters and names */ |
| 701 | 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] | 702 | const struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 704 | e = (struct arpt_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (copy_to_user(userptr + off |
| 706 | + offsetof(struct arpt_entry, counters), |
| 707 | &counters[num], |
| 708 | sizeof(counters[num])) != 0) { |
| 709 | ret = -EFAULT; |
| 710 | goto free_counters; |
| 711 | } |
| 712 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 713 | t = arpt_get_target_c(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | if (copy_to_user(userptr + off + e->target_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 715 | + offsetof(struct xt_entry_target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | u.user.name), |
| 717 | t->u.kernel.target->name, |
| 718 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 719 | ret = -EFAULT; |
| 720 | goto free_counters; |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | free_counters: |
| 725 | vfree(counters); |
| 726 | return ret; |
| 727 | } |
| 728 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 729 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 730 | static void compat_standard_from_user(void *dst, const void *src) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 731 | { |
| 732 | int v = *(compat_int_t *)src; |
| 733 | |
| 734 | if (v > 0) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 735 | v += xt_compat_calc_jump(NFPROTO_ARP, v); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 736 | memcpy(dst, &v, sizeof(v)); |
| 737 | } |
| 738 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 739 | static int compat_standard_to_user(void __user *dst, const void *src) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 740 | { |
| 741 | compat_int_t cv = *(int *)src; |
| 742 | |
| 743 | if (cv > 0) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 744 | cv -= xt_compat_calc_jump(NFPROTO_ARP, cv); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 745 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
| 746 | } |
| 747 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 748 | static int compat_calc_entry(const struct arpt_entry *e, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 749 | const struct xt_table_info *info, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 750 | const void *base, struct xt_table_info *newinfo) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 751 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 752 | const struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 753 | unsigned int entry_offset; |
| 754 | int off, i, ret; |
| 755 | |
| 756 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); |
| 757 | entry_offset = (void *)e - base; |
| 758 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 759 | t = arpt_get_target_c(e); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 760 | off += xt_compat_target_offset(t->u.kernel.target); |
| 761 | newinfo->size -= off; |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 762 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 763 | if (ret) |
| 764 | return ret; |
| 765 | |
| 766 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 767 | if (info->hook_entry[i] && |
| 768 | (e < (struct arpt_entry *)(base + info->hook_entry[i]))) |
| 769 | newinfo->hook_entry[i] -= off; |
| 770 | if (info->underflow[i] && |
| 771 | (e < (struct arpt_entry *)(base + info->underflow[i]))) |
| 772 | newinfo->underflow[i] -= off; |
| 773 | } |
| 774 | return 0; |
| 775 | } |
| 776 | |
| 777 | static int compat_table_info(const struct xt_table_info *info, |
| 778 | struct xt_table_info *newinfo) |
| 779 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 780 | struct arpt_entry *iter; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 781 | const void *loc_cpu_entry; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 782 | int ret; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 783 | |
| 784 | if (!newinfo || !info) |
| 785 | return -EINVAL; |
| 786 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 787 | /* we dont care about newinfo->entries */ |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 788 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
| 789 | newinfo->initial_entries = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 790 | loc_cpu_entry = info->entries; |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 791 | xt_compat_init_offsets(NFPROTO_ARP, info->number); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 792 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
| 793 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); |
| 794 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 795 | return ret; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 796 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 797 | return 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 798 | } |
| 799 | #endif |
| 800 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 801 | static int get_info(struct net *net, void __user *user, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 802 | const int *len, int compat) |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 803 | { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 804 | char name[XT_TABLE_MAXNAMELEN]; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 805 | struct xt_table *t; |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 806 | int ret; |
| 807 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 808 | if (*len != sizeof(struct arpt_getinfo)) |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 809 | return -EINVAL; |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 810 | |
| 811 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 812 | return -EFAULT; |
| 813 | |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 814 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 815 | #ifdef CONFIG_COMPAT |
| 816 | if (compat) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 817 | xt_compat_lock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 818 | #endif |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 819 | 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] | 820 | "arptable_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 821 | if (!IS_ERR_OR_NULL(t)) { |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 822 | struct arpt_getinfo info; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 823 | const struct xt_table_info *private = t->private; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 824 | #ifdef CONFIG_COMPAT |
Alexey Dobriyan | 14c7dbe | 2010-02-08 11:17:43 -0800 | [diff] [blame] | 825 | struct xt_table_info tmp; |
| 826 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 827 | if (compat) { |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 828 | ret = compat_table_info(private, &tmp); |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 829 | xt_compat_flush_offsets(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 830 | private = &tmp; |
| 831 | } |
| 832 | #endif |
Vasiliy Kulikov | 1a8b7a6 | 2010-11-03 08:44:12 +0100 | [diff] [blame] | 833 | memset(&info, 0, sizeof(info)); |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 834 | info.valid_hooks = t->valid_hooks; |
| 835 | memcpy(info.hook_entry, private->hook_entry, |
| 836 | sizeof(info.hook_entry)); |
| 837 | memcpy(info.underflow, private->underflow, |
| 838 | sizeof(info.underflow)); |
| 839 | info.num_entries = private->number; |
| 840 | info.size = private->size; |
| 841 | strcpy(info.name, name); |
| 842 | |
| 843 | if (copy_to_user(user, &info, *len) != 0) |
| 844 | ret = -EFAULT; |
| 845 | else |
| 846 | ret = 0; |
| 847 | xt_table_unlock(t); |
| 848 | module_put(t->me); |
| 849 | } else |
| 850 | ret = t ? PTR_ERR(t) : -ENOENT; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 851 | #ifdef CONFIG_COMPAT |
| 852 | if (compat) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 853 | xt_compat_unlock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 854 | #endif |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 855 | return ret; |
| 856 | } |
| 857 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 858 | 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] | 859 | const int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | { |
| 861 | int ret; |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 862 | struct arpt_get_entries get; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 863 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 865 | if (*len < sizeof(get)) |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 866 | return -EINVAL; |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 867 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 868 | return -EFAULT; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 869 | if (*len != sizeof(struct arpt_get_entries) + get.size) |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 870 | return -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 871 | |
Pablo Neira Ayuso | b301f25 | 2016-03-24 21:29:53 +0100 | [diff] [blame] | 872 | get.name[sizeof(get.name) - 1] = '\0'; |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 873 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 874 | 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] | 875 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 876 | const struct xt_table_info *private = t->private; |
| 877 | |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 878 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 879 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | t, uptr->entrytable); |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 881 | else |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 882 | ret = -EAGAIN; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 883 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 884 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 885 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | } else |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 887 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
| 889 | return ret; |
| 890 | } |
| 891 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 892 | static int __do_replace(struct net *net, const char *name, |
| 893 | unsigned int valid_hooks, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 894 | struct xt_table_info *newinfo, |
| 895 | unsigned int num_counters, |
| 896 | void __user *counters_ptr) |
| 897 | { |
| 898 | int ret; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 899 | struct xt_table *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 900 | struct xt_table_info *oldinfo; |
| 901 | struct xt_counters *counters; |
| 902 | void *loc_cpu_old_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 903 | struct arpt_entry *iter; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 904 | |
| 905 | ret = 0; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 906 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 907 | if (!counters) { |
| 908 | ret = -ENOMEM; |
| 909 | goto out; |
| 910 | } |
| 911 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 912 | 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] | 913 | "arptable_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 914 | if (IS_ERR_OR_NULL(t)) { |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 915 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 916 | goto free_newinfo_counters_untrans; |
| 917 | } |
| 918 | |
| 919 | /* You lied! */ |
| 920 | if (valid_hooks != t->valid_hooks) { |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 921 | ret = -EINVAL; |
| 922 | goto put_module; |
| 923 | } |
| 924 | |
| 925 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 926 | if (!oldinfo) |
| 927 | goto put_module; |
| 928 | |
| 929 | /* Update module usage count based on number of rules */ |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 930 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 931 | (newinfo->number <= oldinfo->initial_entries)) |
| 932 | module_put(t->me); |
| 933 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 934 | (newinfo->number <= oldinfo->initial_entries)) |
| 935 | module_put(t->me); |
| 936 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 937 | /* Get the old counters, and synchronize with replace */ |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 938 | get_counters(oldinfo, counters); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 939 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 940 | /* Decrease module usage counts and free resource */ |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 941 | loc_cpu_old_entry = oldinfo->entries; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 942 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 943 | cleanup_entry(iter, net); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 944 | |
| 945 | xt_free_table_info(oldinfo); |
| 946 | if (copy_to_user(counters_ptr, counters, |
Thomas Graf | c58dd2d | 2014-04-04 17:57:45 +0200 | [diff] [blame] | 947 | sizeof(struct xt_counters) * num_counters) != 0) { |
| 948 | /* Silent error, can't fail, new table is already in place */ |
| 949 | net_warn_ratelimited("arptables: counters copy to user failed while replacing table\n"); |
| 950 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 951 | vfree(counters); |
| 952 | xt_table_unlock(t); |
| 953 | return ret; |
| 954 | |
| 955 | put_module: |
| 956 | module_put(t->me); |
| 957 | xt_table_unlock(t); |
| 958 | free_newinfo_counters_untrans: |
| 959 | vfree(counters); |
| 960 | out: |
| 961 | return ret; |
| 962 | } |
| 963 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 964 | static int do_replace(struct net *net, const void __user *user, |
Ian Morris | 6c28255 | 2015-10-14 23:17:06 +0100 | [diff] [blame] | 965 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | { |
| 967 | int ret; |
| 968 | struct arpt_replace tmp; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 969 | struct xt_table_info *newinfo; |
| 970 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 971 | struct arpt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
| 973 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 974 | return -EFAULT; |
| 975 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 976 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 977 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 978 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 979 | if (tmp.num_counters == 0) |
| 980 | return -EINVAL; |
| 981 | |
Vasiliy Kulikov | 42eab94 | 2011-03-15 13:35:21 +0100 | [diff] [blame] | 982 | tmp.name[sizeof(tmp.name)-1] = 0; |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 983 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 984 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | if (!newinfo) |
| 986 | return -ENOMEM; |
| 987 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 988 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 989 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | tmp.size) != 0) { |
| 991 | ret = -EFAULT; |
| 992 | goto free_newinfo; |
| 993 | } |
| 994 | |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 995 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | if (ret != 0) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 997 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 999 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1000 | tmp.num_counters, tmp.counters); |
| 1001 | if (ret) |
| 1002 | goto free_newinfo_untrans; |
| 1003 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1005 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1006 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 1007 | cleanup_entry(iter, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1009 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | return ret; |
| 1011 | } |
| 1012 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1013 | static int do_add_counters(struct net *net, const void __user *user, |
| 1014 | unsigned int len, int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | { |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1016 | unsigned int i; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1017 | struct xt_counters_info tmp; |
| 1018 | struct xt_counters *paddc; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1019 | struct xt_table *t; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1020 | const struct xt_table_info *private; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1021 | int ret = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1022 | struct arpt_entry *iter; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1023 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame] | 1025 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
| 1026 | if (IS_ERR(paddc)) |
| 1027 | return PTR_ERR(paddc); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1028 | |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame] | 1029 | t = xt_find_table_lock(net, NFPROTO_ARP, tmp.name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1030 | if (IS_ERR_OR_NULL(t)) { |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1031 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | goto free; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1033 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1035 | local_bh_disable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1036 | private = t->private; |
Florian Westphal | d7591f0 | 2016-04-01 15:37:59 +0200 | [diff] [blame] | 1037 | if (private->number != tmp.num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | ret = -EINVAL; |
| 1039 | goto unlock_up_free; |
| 1040 | } |
| 1041 | |
| 1042 | i = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1043 | |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1044 | addend = xt_write_recseq_begin(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1045 | xt_entry_foreach(iter, private->entries, private->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1046 | struct xt_counters *tmp; |
| 1047 | |
| 1048 | tmp = xt_get_this_cpu_counter(&iter->counters); |
| 1049 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1050 | ++i; |
| 1051 | } |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1052 | xt_write_recseq_end(addend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | unlock_up_free: |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1054 | local_bh_enable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1055 | xt_table_unlock(t); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1056 | module_put(t->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | free: |
| 1058 | vfree(paddc); |
| 1059 | |
| 1060 | return ret; |
| 1061 | } |
| 1062 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1063 | #ifdef CONFIG_COMPAT |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1064 | struct compat_arpt_replace { |
| 1065 | char name[XT_TABLE_MAXNAMELEN]; |
| 1066 | u32 valid_hooks; |
| 1067 | u32 num_entries; |
| 1068 | u32 size; |
| 1069 | u32 hook_entry[NF_ARP_NUMHOOKS]; |
| 1070 | u32 underflow[NF_ARP_NUMHOOKS]; |
| 1071 | u32 num_counters; |
| 1072 | compat_uptr_t counters; |
| 1073 | struct compat_arpt_entry entries[0]; |
| 1074 | }; |
| 1075 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1076 | static inline void compat_release_entry(struct compat_arpt_entry *e) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1077 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1078 | struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1079 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1080 | t = compat_arpt_get_target(e); |
| 1081 | module_put(t->u.kernel.target->me); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1082 | } |
| 1083 | |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1084 | static int |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1085 | check_compat_entry_size_and_hooks(struct compat_arpt_entry *e, |
| 1086 | struct xt_table_info *newinfo, |
| 1087 | unsigned int *size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1088 | const unsigned char *base, |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1089 | const unsigned char *limit) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1090 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1091 | struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1092 | struct xt_target *target; |
| 1093 | unsigned int entry_offset; |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1094 | int ret, off; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1095 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 1096 | if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 || |
Florian Westphal | 6e94e0c | 2016-03-22 18:02:50 +0100 | [diff] [blame] | 1097 | (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit || |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1098 | (unsigned char *)e + e->next_offset > limit) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1099 | return -EINVAL; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1100 | |
| 1101 | if (e->next_offset < sizeof(struct compat_arpt_entry) + |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1102 | sizeof(struct compat_xt_entry_target)) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1103 | return -EINVAL; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1104 | |
Florian Westphal | aa412ba | 2016-04-01 14:17:24 +0200 | [diff] [blame] | 1105 | if (!arp_checkentry(&e->arp)) |
| 1106 | return -EINVAL; |
| 1107 | |
Florian Westphal | ce683e5 | 2016-04-01 14:17:28 +0200 | [diff] [blame] | 1108 | ret = xt_compat_check_entry_offsets(e, e->elems, e->target_offset, |
Florian Westphal | fc1221b | 2016-04-01 14:17:26 +0200 | [diff] [blame] | 1109 | e->next_offset); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1110 | if (ret) |
| 1111 | return ret; |
| 1112 | |
| 1113 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); |
| 1114 | entry_offset = (void *)e - (void *)base; |
| 1115 | |
| 1116 | t = compat_arpt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1117 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
| 1118 | t->u.user.revision); |
| 1119 | if (IS_ERR(target)) { |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1120 | ret = PTR_ERR(target); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1121 | goto out; |
| 1122 | } |
| 1123 | t->u.kernel.target = target; |
| 1124 | |
| 1125 | off += xt_compat_target_offset(target); |
| 1126 | *size += off; |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1127 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1128 | if (ret) |
| 1129 | goto release_target; |
| 1130 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1131 | return 0; |
| 1132 | |
| 1133 | release_target: |
| 1134 | module_put(t->u.kernel.target->me); |
| 1135 | out: |
| 1136 | return ret; |
| 1137 | } |
| 1138 | |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1139 | static void |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1140 | compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1141 | unsigned int *size, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1142 | struct xt_table_info *newinfo, unsigned char *base) |
| 1143 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1144 | struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1145 | struct xt_target *target; |
| 1146 | struct arpt_entry *de; |
| 1147 | unsigned int origsize; |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1148 | int h; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1149 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1150 | origsize = *size; |
| 1151 | de = (struct arpt_entry *)*dstptr; |
| 1152 | memcpy(de, e, sizeof(struct arpt_entry)); |
| 1153 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
| 1154 | |
| 1155 | *dstptr += sizeof(struct arpt_entry); |
| 1156 | *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); |
| 1157 | |
| 1158 | de->target_offset = e->target_offset - (origsize - *size); |
| 1159 | t = compat_arpt_get_target(e); |
| 1160 | target = t->u.kernel.target; |
| 1161 | xt_compat_target_from_user(t, dstptr, size); |
| 1162 | |
| 1163 | de->next_offset = e->next_offset - (origsize - *size); |
| 1164 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { |
| 1165 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1166 | newinfo->hook_entry[h] -= origsize - *size; |
| 1167 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1168 | newinfo->underflow[h] -= origsize - *size; |
| 1169 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1170 | } |
| 1171 | |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 1172 | static int translate_compat_table(struct net *net, |
| 1173 | struct xt_table_info **pinfo, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1174 | void **pentry0, |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1175 | const struct compat_arpt_replace *compatr) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1176 | { |
| 1177 | unsigned int i, j; |
| 1178 | struct xt_table_info *newinfo, *info; |
| 1179 | void *pos, *entry0, *entry1; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1180 | struct compat_arpt_entry *iter0; |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1181 | struct arpt_replace repl; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1182 | unsigned int size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1183 | int ret = 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1184 | |
| 1185 | info = *pinfo; |
| 1186 | entry0 = *pentry0; |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1187 | size = compatr->size; |
| 1188 | info->number = compatr->num_entries; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1189 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1190 | j = 0; |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1191 | xt_compat_lock(NFPROTO_ARP); |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1192 | xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1193 | /* Walk through entries, checking offsets. */ |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1194 | xt_entry_foreach(iter0, entry0, compatr->size) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1195 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1196 | entry0, |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1197 | entry0 + compatr->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1198 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1199 | goto out_unlock; |
| 1200 | ++j; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1201 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1202 | |
| 1203 | ret = -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1204 | if (j != compatr->num_entries) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1205 | goto out_unlock; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1206 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1207 | ret = -ENOMEM; |
| 1208 | newinfo = xt_alloc_table_info(size); |
| 1209 | if (!newinfo) |
| 1210 | goto out_unlock; |
| 1211 | |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1212 | newinfo->number = compatr->num_entries; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1213 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
Hongxu Jia | 17a49cd | 2016-11-29 21:56:26 -0500 | [diff] [blame] | 1214 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
| 1215 | newinfo->underflow[i] = compatr->underflow[i]; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1216 | } |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1217 | entry1 = newinfo->entries; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1218 | pos = entry1; |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1219 | size = compatr->size; |
Florian Westphal | 0188346 | 2016-04-01 14:17:33 +0200 | [diff] [blame] | 1220 | xt_entry_foreach(iter0, entry0, compatr->size) |
| 1221 | compat_copy_entry_from_user(iter0, &pos, &size, |
| 1222 | newinfo, entry1); |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1223 | |
| 1224 | /* all module references in entry0 are now gone */ |
| 1225 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1226 | xt_compat_flush_offsets(NFPROTO_ARP); |
| 1227 | xt_compat_unlock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1228 | |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1229 | memcpy(&repl, compatr, sizeof(*compatr)); |
| 1230 | |
| 1231 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
| 1232 | repl.hook_entry[i] = newinfo->hook_entry[i]; |
| 1233 | repl.underflow[i] = newinfo->underflow[i]; |
| 1234 | } |
| 1235 | |
| 1236 | repl.num_counters = 0; |
| 1237 | repl.counters = NULL; |
| 1238 | repl.size = newinfo->size; |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 1239 | ret = translate_table(net, newinfo, entry1, &repl); |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1240 | if (ret) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1241 | goto free_newinfo; |
| 1242 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1243 | *pinfo = newinfo; |
| 1244 | *pentry0 = entry1; |
| 1245 | xt_free_table_info(info); |
| 1246 | return 0; |
| 1247 | |
| 1248 | free_newinfo: |
| 1249 | xt_free_table_info(newinfo); |
Florian Westphal | 09d9686 | 2016-04-01 14:17:34 +0200 | [diff] [blame] | 1250 | return ret; |
| 1251 | out_unlock: |
| 1252 | xt_compat_flush_offsets(NFPROTO_ARP); |
| 1253 | xt_compat_unlock(NFPROTO_ARP); |
Florian Westphal | 8dddd32 | 2016-04-01 14:17:32 +0200 | [diff] [blame] | 1254 | xt_entry_foreach(iter0, entry0, compatr->size) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1255 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1256 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1257 | compat_release_entry(iter0); |
| 1258 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1259 | return ret; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1260 | } |
| 1261 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1262 | static int compat_do_replace(struct net *net, void __user *user, |
| 1263 | unsigned int len) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1264 | { |
| 1265 | int ret; |
| 1266 | struct compat_arpt_replace tmp; |
| 1267 | struct xt_table_info *newinfo; |
| 1268 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1269 | struct arpt_entry *iter; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1270 | |
| 1271 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1272 | return -EFAULT; |
| 1273 | |
| 1274 | /* overflow check */ |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1275 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1276 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1277 | if (tmp.num_counters == 0) |
| 1278 | return -EINVAL; |
| 1279 | |
Vasiliy Kulikov | 42eab94 | 2011-03-15 13:35:21 +0100 | [diff] [blame] | 1280 | tmp.name[sizeof(tmp.name)-1] = 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1281 | |
| 1282 | newinfo = xt_alloc_table_info(tmp.size); |
| 1283 | if (!newinfo) |
| 1284 | return -ENOMEM; |
| 1285 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1286 | loc_cpu_entry = newinfo->entries; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1287 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) { |
| 1288 | ret = -EFAULT; |
| 1289 | goto free_newinfo; |
| 1290 | } |
| 1291 | |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 1292 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1293 | if (ret != 0) |
| 1294 | goto free_newinfo; |
| 1295 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1296 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1297 | tmp.num_counters, compat_ptr(tmp.counters)); |
| 1298 | if (ret) |
| 1299 | goto free_newinfo_untrans; |
| 1300 | return 0; |
| 1301 | |
| 1302 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1303 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 1304 | cleanup_entry(iter, net); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1305 | free_newinfo: |
| 1306 | xt_free_table_info(newinfo); |
| 1307 | return ret; |
| 1308 | } |
| 1309 | |
| 1310 | static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, |
| 1311 | unsigned int len) |
| 1312 | { |
| 1313 | int ret; |
| 1314 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1315 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1316 | return -EPERM; |
| 1317 | |
| 1318 | switch (cmd) { |
| 1319 | case ARPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1320 | ret = compat_do_replace(sock_net(sk), user, len); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1321 | break; |
| 1322 | |
| 1323 | case ARPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1324 | ret = do_add_counters(sock_net(sk), user, len, 1); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1325 | break; |
| 1326 | |
| 1327 | default: |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1328 | ret = -EINVAL; |
| 1329 | } |
| 1330 | |
| 1331 | return ret; |
| 1332 | } |
| 1333 | |
| 1334 | static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr, |
| 1335 | compat_uint_t *size, |
| 1336 | struct xt_counters *counters, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1337 | unsigned int i) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1338 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1339 | struct xt_entry_target *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1340 | struct compat_arpt_entry __user *ce; |
| 1341 | u_int16_t target_offset, next_offset; |
| 1342 | compat_uint_t origsize; |
| 1343 | int ret; |
| 1344 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1345 | origsize = *size; |
| 1346 | ce = (struct compat_arpt_entry __user *)*dstptr; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1347 | if (copy_to_user(ce, e, sizeof(struct arpt_entry)) != 0 || |
| 1348 | copy_to_user(&ce->counters, &counters[i], |
| 1349 | sizeof(counters[i])) != 0) |
| 1350 | return -EFAULT; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1351 | |
| 1352 | *dstptr += sizeof(struct compat_arpt_entry); |
| 1353 | *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); |
| 1354 | |
| 1355 | target_offset = e->target_offset - (origsize - *size); |
| 1356 | |
| 1357 | t = arpt_get_target(e); |
| 1358 | ret = xt_compat_target_to_user(t, dstptr, size); |
| 1359 | if (ret) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1360 | return ret; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1361 | next_offset = e->next_offset - (origsize - *size); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1362 | if (put_user(target_offset, &ce->target_offset) != 0 || |
| 1363 | put_user(next_offset, &ce->next_offset) != 0) |
| 1364 | return -EFAULT; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1365 | return 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1366 | } |
| 1367 | |
| 1368 | static int compat_copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1369 | struct xt_table *table, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1370 | void __user *userptr) |
| 1371 | { |
| 1372 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1373 | const struct xt_table_info *private = table->private; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1374 | void __user *pos; |
| 1375 | unsigned int size; |
| 1376 | int ret = 0; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1377 | unsigned int i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1378 | struct arpt_entry *iter; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1379 | |
| 1380 | counters = alloc_counters(table); |
| 1381 | if (IS_ERR(counters)) |
| 1382 | return PTR_ERR(counters); |
| 1383 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1384 | pos = userptr; |
| 1385 | size = total_size; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1386 | xt_entry_foreach(iter, private->entries, total_size) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1387 | ret = compat_copy_entry_to_user(iter, &pos, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1388 | &size, counters, i++); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1389 | if (ret != 0) |
| 1390 | break; |
| 1391 | } |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1392 | vfree(counters); |
| 1393 | return ret; |
| 1394 | } |
| 1395 | |
| 1396 | struct compat_arpt_get_entries { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1397 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1398 | compat_uint_t size; |
| 1399 | struct compat_arpt_entry entrytable[0]; |
| 1400 | }; |
| 1401 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1402 | static int compat_get_entries(struct net *net, |
| 1403 | struct compat_arpt_get_entries __user *uptr, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1404 | int *len) |
| 1405 | { |
| 1406 | int ret; |
| 1407 | struct compat_arpt_get_entries get; |
Jan Engelhardt | 4abff07 | 2008-04-14 11:15:43 +0200 | [diff] [blame] | 1408 | struct xt_table *t; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1409 | |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1410 | if (*len < sizeof(get)) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1411 | return -EINVAL; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1412 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1413 | return -EFAULT; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1414 | if (*len != sizeof(struct compat_arpt_get_entries) + get.size) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1415 | return -EINVAL; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1416 | |
Pablo Neira Ayuso | b301f25 | 2016-03-24 21:29:53 +0100 | [diff] [blame] | 1417 | get.name[sizeof(get.name) - 1] = '\0'; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1418 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1419 | xt_compat_lock(NFPROTO_ARP); |
| 1420 | 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] | 1421 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1422 | const struct xt_table_info *private = t->private; |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1423 | struct xt_table_info info; |
| 1424 | |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1425 | ret = compat_table_info(private, &info); |
| 1426 | if (!ret && get.size == info.size) { |
| 1427 | ret = compat_copy_entries_to_user(private->size, |
| 1428 | t, uptr->entrytable); |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1429 | } else if (!ret) |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1430 | ret = -EAGAIN; |
Pablo Neira Ayuso | d7cdf81 | 2016-05-03 13:54:23 +0200 | [diff] [blame] | 1431 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1432 | xt_compat_flush_offsets(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1433 | module_put(t->me); |
| 1434 | xt_table_unlock(t); |
| 1435 | } else |
| 1436 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1437 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1438 | xt_compat_unlock(NFPROTO_ARP); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1439 | return ret; |
| 1440 | } |
| 1441 | |
| 1442 | static int do_arpt_get_ctl(struct sock *, int, void __user *, int *); |
| 1443 | |
| 1444 | static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, |
| 1445 | int *len) |
| 1446 | { |
| 1447 | int ret; |
| 1448 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1449 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1450 | return -EPERM; |
| 1451 | |
| 1452 | switch (cmd) { |
| 1453 | case ARPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1454 | ret = get_info(sock_net(sk), user, len, 1); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1455 | break; |
| 1456 | case ARPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1457 | ret = compat_get_entries(sock_net(sk), user, len); |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1458 | break; |
| 1459 | default: |
| 1460 | ret = do_arpt_get_ctl(sk, cmd, user, len); |
| 1461 | } |
| 1462 | return ret; |
| 1463 | } |
| 1464 | #endif |
| 1465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
| 1467 | { |
| 1468 | int ret; |
| 1469 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1470 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | return -EPERM; |
| 1472 | |
| 1473 | switch (cmd) { |
| 1474 | case ARPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1475 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | break; |
| 1477 | |
| 1478 | case ARPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1479 | ret = do_add_counters(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | break; |
| 1481 | |
| 1482 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | ret = -EINVAL; |
| 1484 | } |
| 1485 | |
| 1486 | return ret; |
| 1487 | } |
| 1488 | |
| 1489 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1490 | { |
| 1491 | int ret; |
| 1492 | |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 1493 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | return -EPERM; |
| 1495 | |
| 1496 | switch (cmd) { |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 1497 | case ARPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1498 | ret = get_info(sock_net(sk), user, len, 0); |
Patrick McHardy | 41acd97 | 2007-12-17 22:26:24 -0800 | [diff] [blame] | 1499 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | |
Patrick McHardy | 11f6dff | 2007-12-17 22:26:38 -0800 | [diff] [blame] | 1501 | case ARPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1502 | ret = get_entries(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1505 | case ARPT_SO_GET_REVISION_TARGET: { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1506 | struct xt_get_revision rev; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1507 | |
| 1508 | if (*len != sizeof(rev)) { |
| 1509 | ret = -EINVAL; |
| 1510 | break; |
| 1511 | } |
| 1512 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 1513 | ret = -EFAULT; |
| 1514 | break; |
| 1515 | } |
Vasiliy Kulikov | 42eab94 | 2011-03-15 13:35:21 +0100 | [diff] [blame] | 1516 | rev.name[sizeof(rev.name)-1] = 0; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1517 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1518 | try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1519 | rev.revision, 1, &ret), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1520 | "arpt_%s", rev.name); |
| 1521 | break; |
| 1522 | } |
| 1523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | ret = -EINVAL; |
| 1526 | } |
| 1527 | |
| 1528 | return ret; |
| 1529 | } |
| 1530 | |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 1531 | static void __arpt_unregister_table(struct net *net, struct xt_table *table) |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1532 | { |
| 1533 | struct xt_table_info *private; |
| 1534 | void *loc_cpu_entry; |
| 1535 | struct module *table_owner = table->me; |
| 1536 | struct arpt_entry *iter; |
| 1537 | |
| 1538 | private = xt_unregister_table(table); |
| 1539 | |
| 1540 | /* Decrease module usage counts and free resources */ |
| 1541 | loc_cpu_entry = private->entries; |
| 1542 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 1543 | cleanup_entry(iter, net); |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1544 | if (private->number > private->initial_entries) |
| 1545 | module_put(table_owner); |
| 1546 | xt_free_table_info(private); |
| 1547 | } |
| 1548 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1549 | int arpt_register_table(struct net *net, |
| 1550 | const struct xt_table *table, |
| 1551 | const struct arpt_replace *repl, |
| 1552 | const struct nf_hook_ops *ops, |
| 1553 | struct xt_table **res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | { |
| 1555 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1556 | struct xt_table_info *newinfo; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 1557 | struct xt_table_info bootstrap = {0}; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1558 | void *loc_cpu_entry; |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 1559 | struct xt_table *new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1561 | newinfo = xt_alloc_table_info(repl->size); |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1562 | if (!newinfo) |
| 1563 | return -ENOMEM; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1564 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1565 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1566 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | |
Florian Westphal | 76c146c | 2019-12-27 01:33:10 +0100 | [diff] [blame] | 1568 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1569 | if (ret != 0) |
| 1570 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | |
Alexey Dobriyan | 79df341 | 2008-01-31 04:04:32 -0800 | [diff] [blame] | 1572 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 1573 | if (IS_ERR(new_table)) { |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1574 | ret = PTR_ERR(new_table); |
| 1575 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | } |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1577 | |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1578 | /* set res now, will see skbs right after nf_register_net_hooks */ |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1579 | WRITE_ONCE(*res, new_table); |
| 1580 | |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1581 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); |
| 1582 | if (ret != 0) { |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 1583 | __arpt_unregister_table(net, new_table); |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1584 | *res = NULL; |
| 1585 | } |
| 1586 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1587 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 1589 | out_free: |
| 1590 | xt_free_table_info(newinfo); |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1591 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | } |
| 1593 | |
Florian Westphal | a67dd26 | 2016-02-25 10:08:35 +0100 | [diff] [blame] | 1594 | void arpt_unregister_table(struct net *net, struct xt_table *table, |
| 1595 | const struct nf_hook_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | { |
Florian Westphal | b9e69e1 | 2016-02-25 10:08:36 +0100 | [diff] [blame] | 1597 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
Florian Westphal | 2564ab9 | 2020-01-11 23:19:53 +0100 | [diff] [blame] | 1598 | __arpt_unregister_table(net, table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | } |
| 1600 | |
| 1601 | /* The built-in targets: standard (NULL) and error. */ |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1602 | static struct xt_target arpt_builtin_tg[] __read_mostly = { |
| 1603 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 1604 | .name = XT_STANDARD_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1605 | .targetsize = sizeof(int), |
| 1606 | .family = NFPROTO_ARP, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1607 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1608 | .compatsize = sizeof(compat_int_t), |
| 1609 | .compat_from_user = compat_standard_from_user, |
| 1610 | .compat_to_user = compat_standard_to_user, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1611 | #endif |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1612 | }, |
| 1613 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 1614 | .name = XT_ERROR_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1615 | .target = arpt_error, |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1616 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1617 | .family = NFPROTO_ARP, |
| 1618 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | }; |
| 1620 | |
| 1621 | static struct nf_sockopt_ops arpt_sockopts = { |
| 1622 | .pf = PF_INET, |
| 1623 | .set_optmin = ARPT_BASE_CTL, |
| 1624 | .set_optmax = ARPT_SO_SET_MAX+1, |
| 1625 | .set = do_arpt_set_ctl, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1626 | #ifdef CONFIG_COMPAT |
| 1627 | .compat_set = compat_do_arpt_set_ctl, |
| 1628 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | .get_optmin = ARPT_BASE_CTL, |
| 1630 | .get_optmax = ARPT_SO_GET_MAX+1, |
| 1631 | .get = do_arpt_get_ctl, |
Patrick McHardy | d6a2ba0 | 2007-12-17 22:26:54 -0800 | [diff] [blame] | 1632 | #ifdef CONFIG_COMPAT |
| 1633 | .compat_get = compat_do_arpt_get_ctl, |
| 1634 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 1635 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | }; |
| 1637 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1638 | static int __net_init arp_tables_net_init(struct net *net) |
| 1639 | { |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1640 | return xt_proto_init(net, NFPROTO_ARP); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1641 | } |
| 1642 | |
| 1643 | static void __net_exit arp_tables_net_exit(struct net *net) |
| 1644 | { |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 1645 | xt_proto_fini(net, NFPROTO_ARP); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1646 | } |
| 1647 | |
| 1648 | static struct pernet_operations arp_tables_net_ops = { |
| 1649 | .init = arp_tables_net_init, |
| 1650 | .exit = arp_tables_net_exit, |
| 1651 | }; |
| 1652 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1653 | static int __init arp_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | { |
| 1655 | int ret; |
| 1656 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1657 | ret = register_pernet_subsys(&arp_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1658 | if (ret < 0) |
| 1659 | goto err1; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1660 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1661 | /* 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] | 1662 | ret = xt_register_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1663 | if (ret < 0) |
| 1664 | goto err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | |
| 1666 | /* Register setsockopt */ |
| 1667 | ret = nf_register_sockopt(&arpt_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1668 | if (ret < 0) |
| 1669 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | |
Bastian Stender | 09605cc | 2015-11-13 11:40:34 +0100 | [diff] [blame] | 1671 | pr_info("arp_tables: (C) 2002 David S. Miller\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1673 | |
| 1674 | err4: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1675 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1676 | err2: |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1677 | unregister_pernet_subsys(&arp_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1678 | err1: |
| 1679 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | } |
| 1681 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1682 | static void __exit arp_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | { |
| 1684 | nf_unregister_sockopt(&arpt_sockopts); |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 1685 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 1686 | unregister_pernet_subsys(&arp_tables_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | } |
| 1688 | |
| 1689 | EXPORT_SYMBOL(arpt_register_table); |
| 1690 | EXPORT_SYMBOL(arpt_unregister_table); |
| 1691 | EXPORT_SYMBOL(arpt_do_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1693 | module_init(arp_tables_init); |
| 1694 | module_exit(arp_tables_fini); |