Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 9 | */ |
| 10 | |
Joe Perches | a81b2ce | 2015-03-23 11:50:10 -0700 | [diff] [blame] | 11 | #include <linux/kernel.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/list.h> |
| 15 | #include <linux/rculist.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/netlink.h> |
| 18 | #include <linux/netfilter.h> |
| 19 | #include <linux/netfilter/nfnetlink.h> |
| 20 | #include <linux/netfilter/nf_tables.h> |
| 21 | #include <net/netfilter/nf_tables_core.h> |
| 22 | #include <net/netfilter/nf_tables.h> |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 23 | #include <net/netfilter/nf_log.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 24 | |
Patrick McHardy | 01ef16c | 2015-03-03 20:10:04 +0000 | [diff] [blame] | 25 | enum nft_trace { |
| 26 | NFT_TRACE_RULE, |
| 27 | NFT_TRACE_RETURN, |
| 28 | NFT_TRACE_POLICY, |
| 29 | }; |
| 30 | |
| 31 | static const char *const comments[] = { |
| 32 | [NFT_TRACE_RULE] = "rule", |
| 33 | [NFT_TRACE_RETURN] = "return", |
| 34 | [NFT_TRACE_POLICY] = "policy", |
| 35 | }; |
| 36 | |
| 37 | static struct nf_loginfo trace_loginfo = { |
| 38 | .type = NF_LOG_TYPE_LOG, |
| 39 | .u = { |
| 40 | .log = { |
Joe Perches | a81b2ce | 2015-03-23 11:50:10 -0700 | [diff] [blame] | 41 | .level = LOGLEVEL_WARNING, |
Patrick McHardy | 01ef16c | 2015-03-03 20:10:04 +0000 | [diff] [blame] | 42 | .logflags = NF_LOG_MASK, |
| 43 | }, |
| 44 | }, |
| 45 | }; |
| 46 | |
| 47 | static void __nft_trace_packet(const struct nft_pktinfo *pkt, |
| 48 | const struct nft_chain *chain, |
| 49 | int rulenum, enum nft_trace type) |
| 50 | { |
Eric W. Biederman | 88182a0 | 2015-09-18 14:33:01 -0500 | [diff] [blame] | 51 | nf_log_trace(pkt->net, pkt->pf, pkt->hook, pkt->skb, pkt->in, |
Pablo Neira Ayuso | fce1528 | 2015-03-24 10:55:38 +0100 | [diff] [blame] | 52 | pkt->out, &trace_loginfo, "TRACE: %s:%s:%s:%u ", |
| 53 | chain->table->name, chain->name, comments[type], |
| 54 | rulenum); |
Patrick McHardy | 01ef16c | 2015-03-03 20:10:04 +0000 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | static inline void nft_trace_packet(const struct nft_pktinfo *pkt, |
| 58 | const struct nft_chain *chain, |
| 59 | int rulenum, enum nft_trace type) |
| 60 | { |
| 61 | if (unlikely(pkt->skb->nf_trace)) |
| 62 | __nft_trace_packet(pkt, chain, rulenum, type); |
| 63 | } |
| 64 | |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 65 | static void nft_cmp_fast_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 66 | struct nft_regs *regs) |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 67 | { |
| 68 | const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr); |
Patrick McHardy | b855d41 | 2014-04-12 13:17:57 +0200 | [diff] [blame] | 69 | u32 mask = nft_cmp_fast_mask(priv->len); |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 70 | |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 71 | if ((regs->data[priv->sreg] & mask) == priv->data) |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 72 | return; |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 73 | regs->verdict.code = NFT_BREAK; |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 74 | } |
| 75 | |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 76 | static bool nft_payload_fast_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 77 | struct nft_regs *regs, |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 78 | const struct nft_pktinfo *pkt) |
| 79 | { |
| 80 | const struct nft_payload *priv = nft_expr_priv(expr); |
| 81 | const struct sk_buff *skb = pkt->skb; |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 82 | u32 *dest = ®s->data[priv->dreg]; |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 83 | unsigned char *ptr; |
| 84 | |
| 85 | if (priv->base == NFT_PAYLOAD_NETWORK_HEADER) |
| 86 | ptr = skb_network_header(skb); |
| 87 | else |
Pablo Neira Ayuso | c54032e | 2013-10-11 10:00:22 +0200 | [diff] [blame] | 88 | ptr = skb_network_header(skb) + pkt->xt.thoff; |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 89 | |
| 90 | ptr += priv->offset; |
| 91 | |
| 92 | if (unlikely(ptr + priv->len >= skb_tail_pointer(skb))) |
| 93 | return false; |
| 94 | |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 95 | *dest = 0; |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 96 | if (priv->len == 2) |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 97 | *(u16 *)dest = *(u16 *)ptr; |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 98 | else if (priv->len == 4) |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 99 | *(u32 *)dest = *(u32 *)ptr; |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 100 | else |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 101 | *(u8 *)dest = *(u8 *)ptr; |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 102 | return true; |
| 103 | } |
| 104 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 105 | struct nft_jumpstack { |
| 106 | const struct nft_chain *chain; |
| 107 | const struct nft_rule *rule; |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 108 | int rulenum; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 109 | }; |
| 110 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 111 | unsigned int |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 112 | nft_do_chain(struct nft_pktinfo *pkt, void *priv) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 113 | { |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 114 | const struct nft_chain *chain = priv, *basechain = chain; |
Eric W. Biederman | 88182a0 | 2015-09-18 14:33:01 -0500 | [diff] [blame] | 115 | const struct net *net = pkt->net; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 116 | const struct nft_rule *rule; |
| 117 | const struct nft_expr *expr, *last; |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 118 | struct nft_regs regs; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 119 | unsigned int stackptr = 0; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 120 | struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE]; |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 121 | struct nft_stats *stats; |
Pablo Neira Ayuso | d088be8 | 2014-05-10 13:39:21 +0200 | [diff] [blame] | 122 | int rulenum; |
Patrick McHardy | ea4bd99 | 2015-03-25 14:08:49 +0000 | [diff] [blame] | 123 | unsigned int gencursor = nft_genmask_cur(net); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 124 | |
| 125 | do_chain: |
Pablo Neira Ayuso | d088be8 | 2014-05-10 13:39:21 +0200 | [diff] [blame] | 126 | rulenum = 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 127 | rule = list_entry(&chain->rules, struct nft_rule, list); |
| 128 | next_rule: |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 129 | regs.verdict.code = NFT_CONTINUE; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 130 | list_for_each_entry_continue_rcu(rule, &chain->rules, list) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 131 | |
| 132 | /* This rule is not active, skip. */ |
| 133 | if (unlikely(rule->genmask & (1 << gencursor))) |
| 134 | continue; |
| 135 | |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 136 | rulenum++; |
| 137 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 138 | nft_rule_for_each_expr(expr, last, rule) { |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 139 | if (expr->ops == &nft_cmp_fast_ops) |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 140 | nft_cmp_fast_eval(expr, ®s); |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 141 | else if (expr->ops != &nft_payload_fast_ops || |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 142 | !nft_payload_fast_eval(expr, ®s, pkt)) |
| 143 | expr->ops->eval(expr, ®s, pkt); |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 144 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 145 | if (regs.verdict.code != NFT_CONTINUE) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 146 | break; |
| 147 | } |
| 148 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 149 | switch (regs.verdict.code) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 150 | case NFT_BREAK: |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 151 | regs.verdict.code = NFT_CONTINUE; |
Pablo Neira Ayuso | 3b084e9 | 2014-05-15 17:18:26 +0200 | [diff] [blame] | 152 | continue; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 153 | case NFT_CONTINUE: |
Patrick McHardy | 01ef16c | 2015-03-03 20:10:04 +0000 | [diff] [blame] | 154 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 155 | continue; |
| 156 | } |
| 157 | break; |
| 158 | } |
| 159 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 160 | switch (regs.verdict.code & NF_VERDICT_MASK) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 161 | case NF_ACCEPT: |
| 162 | case NF_DROP: |
| 163 | case NF_QUEUE: |
Patrick McHardy | 01ef16c | 2015-03-03 20:10:04 +0000 | [diff] [blame] | 164 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE); |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 165 | return regs.verdict.code; |
Eric Leblond | e569bda | 2013-11-30 11:56:17 +0100 | [diff] [blame] | 166 | } |
| 167 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 168 | switch (regs.verdict.code) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 169 | case NFT_JUMP: |
| 170 | BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE); |
| 171 | jumpstack[stackptr].chain = chain; |
| 172 | jumpstack[stackptr].rule = rule; |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 173 | jumpstack[stackptr].rulenum = rulenum; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 174 | stackptr++; |
Patrick McHardy | 354bf5a | 2015-03-03 20:10:05 +0000 | [diff] [blame] | 175 | /* fall through */ |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 176 | case NFT_GOTO: |
Patrick McHardy | 01ef16c | 2015-03-03 20:10:04 +0000 | [diff] [blame] | 177 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE); |
Pablo Neira Ayuso | 7b9d5ef | 2014-05-10 18:42:57 +0200 | [diff] [blame] | 178 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 179 | chain = regs.verdict.chain; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 180 | goto do_chain; |
Patrick McHardy | 354bf5a | 2015-03-03 20:10:05 +0000 | [diff] [blame] | 181 | case NFT_CONTINUE: |
| 182 | rulenum++; |
| 183 | /* fall through */ |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 184 | case NFT_RETURN: |
Patrick McHardy | 01ef16c | 2015-03-03 20:10:04 +0000 | [diff] [blame] | 185 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RETURN); |
Pablo Neira Ayuso | 7e9bc10 | 2014-05-11 17:14:49 +0200 | [diff] [blame] | 186 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 187 | default: |
| 188 | WARN_ON(1); |
| 189 | } |
| 190 | |
| 191 | if (stackptr > 0) { |
| 192 | stackptr--; |
| 193 | chain = jumpstack[stackptr].chain; |
| 194 | rule = jumpstack[stackptr].rule; |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 195 | rulenum = jumpstack[stackptr].rulenum; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 196 | goto next_rule; |
| 197 | } |
| 198 | |
Patrick McHardy | 01ef16c | 2015-03-03 20:10:04 +0000 | [diff] [blame] | 199 | nft_trace_packet(pkt, basechain, -1, NFT_TRACE_POLICY); |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 200 | |
Pablo Neira Ayuso | 5467a51 | 2014-05-10 18:33:11 +0200 | [diff] [blame] | 201 | rcu_read_lock_bh(); |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 202 | stats = this_cpu_ptr(rcu_dereference(nft_base_chain(basechain)->stats)); |
| 203 | u64_stats_update_begin(&stats->syncp); |
| 204 | stats->pkts++; |
| 205 | stats->bytes += pkt->skb->len; |
| 206 | u64_stats_update_end(&stats->syncp); |
Pablo Neira Ayuso | 5467a51 | 2014-05-10 18:33:11 +0200 | [diff] [blame] | 207 | rcu_read_unlock_bh(); |
| 208 | |
| 209 | return nft_base_chain(basechain)->policy; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 210 | } |
Patrick McHardy | 3876d22 | 2014-01-09 18:42:43 +0000 | [diff] [blame] | 211 | EXPORT_SYMBOL_GPL(nft_do_chain); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 212 | |
| 213 | int __init nf_tables_core_module_init(void) |
| 214 | { |
| 215 | int err; |
| 216 | |
| 217 | err = nft_immediate_module_init(); |
| 218 | if (err < 0) |
| 219 | goto err1; |
| 220 | |
| 221 | err = nft_cmp_module_init(); |
| 222 | if (err < 0) |
| 223 | goto err2; |
| 224 | |
| 225 | err = nft_lookup_module_init(); |
| 226 | if (err < 0) |
| 227 | goto err3; |
| 228 | |
| 229 | err = nft_bitwise_module_init(); |
| 230 | if (err < 0) |
| 231 | goto err4; |
| 232 | |
| 233 | err = nft_byteorder_module_init(); |
| 234 | if (err < 0) |
| 235 | goto err5; |
| 236 | |
| 237 | err = nft_payload_module_init(); |
| 238 | if (err < 0) |
| 239 | goto err6; |
| 240 | |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 241 | err = nft_dynset_module_init(); |
| 242 | if (err < 0) |
| 243 | goto err7; |
| 244 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 245 | return 0; |
| 246 | |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 247 | err7: |
| 248 | nft_payload_module_exit(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 249 | err6: |
| 250 | nft_byteorder_module_exit(); |
| 251 | err5: |
| 252 | nft_bitwise_module_exit(); |
| 253 | err4: |
| 254 | nft_lookup_module_exit(); |
| 255 | err3: |
| 256 | nft_cmp_module_exit(); |
| 257 | err2: |
| 258 | nft_immediate_module_exit(); |
| 259 | err1: |
| 260 | return err; |
| 261 | } |
| 262 | |
| 263 | void nf_tables_core_module_exit(void) |
| 264 | { |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 265 | nft_dynset_module_exit(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 266 | nft_payload_module_exit(); |
| 267 | nft_byteorder_module_exit(); |
| 268 | nft_bitwise_module_exit(); |
| 269 | nft_lookup_module_exit(); |
| 270 | nft_cmp_module_exit(); |
| 271 | nft_immediate_module_exit(); |
| 272 | } |