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 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/list.h> |
| 14 | #include <linux/rculist.h> |
| 15 | #include <linux/skbuff.h> |
| 16 | #include <linux/netlink.h> |
| 17 | #include <linux/netfilter.h> |
| 18 | #include <linux/netfilter/nfnetlink.h> |
| 19 | #include <linux/netfilter/nf_tables.h> |
| 20 | #include <net/netfilter/nf_tables_core.h> |
| 21 | #include <net/netfilter/nf_tables.h> |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 22 | #include <net/netfilter/nf_log.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 23 | |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 24 | static void nft_cmp_fast_eval(const struct nft_expr *expr, |
| 25 | struct nft_data data[NFT_REG_MAX + 1]) |
| 26 | { |
| 27 | const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr); |
Patrick McHardy | b855d41 | 2014-04-12 13:17:57 +0200 | [diff] [blame] | 28 | u32 mask = nft_cmp_fast_mask(priv->len); |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 29 | |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 30 | if ((data[priv->sreg].data[0] & mask) == priv->data) |
| 31 | return; |
| 32 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; |
| 33 | } |
| 34 | |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 35 | static bool nft_payload_fast_eval(const struct nft_expr *expr, |
| 36 | struct nft_data data[NFT_REG_MAX + 1], |
| 37 | const struct nft_pktinfo *pkt) |
| 38 | { |
| 39 | const struct nft_payload *priv = nft_expr_priv(expr); |
| 40 | const struct sk_buff *skb = pkt->skb; |
| 41 | struct nft_data *dest = &data[priv->dreg]; |
| 42 | unsigned char *ptr; |
| 43 | |
| 44 | if (priv->base == NFT_PAYLOAD_NETWORK_HEADER) |
| 45 | ptr = skb_network_header(skb); |
| 46 | else |
Pablo Neira Ayuso | c54032e | 2013-10-11 10:00:22 +0200 | [diff] [blame] | 47 | ptr = skb_network_header(skb) + pkt->xt.thoff; |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 48 | |
| 49 | ptr += priv->offset; |
| 50 | |
| 51 | if (unlikely(ptr + priv->len >= skb_tail_pointer(skb))) |
| 52 | return false; |
| 53 | |
| 54 | if (priv->len == 2) |
| 55 | *(u16 *)dest->data = *(u16 *)ptr; |
| 56 | else if (priv->len == 4) |
| 57 | *(u32 *)dest->data = *(u32 *)ptr; |
| 58 | else |
| 59 | *(u8 *)dest->data = *(u8 *)ptr; |
| 60 | return true; |
| 61 | } |
| 62 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 63 | struct nft_jumpstack { |
| 64 | const struct nft_chain *chain; |
| 65 | const struct nft_rule *rule; |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 66 | int rulenum; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 67 | }; |
| 68 | |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 69 | enum nft_trace { |
| 70 | NFT_TRACE_RULE, |
| 71 | NFT_TRACE_RETURN, |
| 72 | NFT_TRACE_POLICY, |
| 73 | }; |
| 74 | |
| 75 | static const char *const comments[] = { |
| 76 | [NFT_TRACE_RULE] = "rule", |
| 77 | [NFT_TRACE_RETURN] = "return", |
| 78 | [NFT_TRACE_POLICY] = "policy", |
| 79 | }; |
| 80 | |
| 81 | static struct nf_loginfo trace_loginfo = { |
| 82 | .type = NF_LOG_TYPE_LOG, |
| 83 | .u = { |
| 84 | .log = { |
| 85 | .level = 4, |
| 86 | .logflags = NF_LOG_MASK, |
| 87 | }, |
| 88 | }, |
| 89 | }; |
| 90 | |
Patrick McHardy | 6d8c00d | 2014-01-09 18:42:42 +0000 | [diff] [blame] | 91 | static void nft_trace_packet(const struct nft_pktinfo *pkt, |
| 92 | const struct nft_chain *chain, |
| 93 | int rulenum, enum nft_trace type) |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 94 | { |
| 95 | struct net *net = dev_net(pkt->in ? pkt->in : pkt->out); |
| 96 | |
Patrick McHardy | c948487 | 2014-01-03 12:16:14 +0000 | [diff] [blame] | 97 | nf_log_packet(net, pkt->xt.family, pkt->ops->hooknum, pkt->skb, pkt->in, |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 98 | pkt->out, &trace_loginfo, "TRACE: %s:%s:%s:%u ", |
| 99 | chain->table->name, chain->name, comments[type], |
| 100 | rulenum); |
| 101 | } |
| 102 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 103 | unsigned int |
Patrick McHardy | 3876d22 | 2014-01-09 18:42:43 +0000 | [diff] [blame] | 104 | nft_do_chain(struct nft_pktinfo *pkt, const struct nf_hook_ops *ops) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 105 | { |
Pablo Neira Ayuso | 5467a51 | 2014-05-10 18:33:11 +0200 | [diff] [blame^] | 106 | const struct nft_chain *chain = ops->priv, *basechain = chain; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 107 | const struct nft_rule *rule; |
| 108 | const struct nft_expr *expr, *last; |
| 109 | struct nft_data data[NFT_REG_MAX + 1]; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 110 | unsigned int stackptr = 0; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 111 | struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE]; |
Pablo Neira Ayuso | 5467a51 | 2014-05-10 18:33:11 +0200 | [diff] [blame^] | 112 | struct nft_stats __percpu *stats; |
Pablo Neira Ayuso | d088be8 | 2014-05-10 13:39:21 +0200 | [diff] [blame] | 113 | int rulenum; |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 114 | /* |
| 115 | * Cache cursor to avoid problems in case that the cursor is updated |
| 116 | * while traversing the ruleset. |
| 117 | */ |
| 118 | unsigned int gencursor = ACCESS_ONCE(chain->net->nft.gencursor); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 119 | |
| 120 | do_chain: |
Pablo Neira Ayuso | d088be8 | 2014-05-10 13:39:21 +0200 | [diff] [blame] | 121 | rulenum = 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 122 | rule = list_entry(&chain->rules, struct nft_rule, list); |
| 123 | next_rule: |
| 124 | data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; |
| 125 | list_for_each_entry_continue_rcu(rule, &chain->rules, list) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 126 | |
| 127 | /* This rule is not active, skip. */ |
| 128 | if (unlikely(rule->genmask & (1 << gencursor))) |
| 129 | continue; |
| 130 | |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 131 | rulenum++; |
| 132 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 133 | nft_rule_for_each_expr(expr, last, rule) { |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 134 | if (expr->ops == &nft_cmp_fast_ops) |
| 135 | nft_cmp_fast_eval(expr, data); |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 136 | else if (expr->ops != &nft_payload_fast_ops || |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 137 | !nft_payload_fast_eval(expr, data, pkt)) |
| 138 | expr->ops->eval(expr, data, pkt); |
Patrick McHardy | cb7dbfd | 2013-10-10 23:35:40 +0200 | [diff] [blame] | 139 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 140 | if (data[NFT_REG_VERDICT].verdict != NFT_CONTINUE) |
| 141 | break; |
| 142 | } |
| 143 | |
| 144 | switch (data[NFT_REG_VERDICT].verdict) { |
| 145 | case NFT_BREAK: |
| 146 | data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; |
| 147 | /* fall through */ |
| 148 | case NFT_CONTINUE: |
| 149 | continue; |
| 150 | } |
| 151 | break; |
| 152 | } |
| 153 | |
Eric Leblond | e569bda | 2013-11-30 11:56:17 +0100 | [diff] [blame] | 154 | switch (data[NFT_REG_VERDICT].verdict & NF_VERDICT_MASK) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 155 | case NF_ACCEPT: |
| 156 | case NF_DROP: |
| 157 | case NF_QUEUE: |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 158 | if (unlikely(pkt->skb->nf_trace)) |
| 159 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE); |
| 160 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 161 | return data[NFT_REG_VERDICT].verdict; |
Eric Leblond | e569bda | 2013-11-30 11:56:17 +0100 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | switch (data[NFT_REG_VERDICT].verdict) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 165 | case NFT_JUMP: |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 166 | if (unlikely(pkt->skb->nf_trace)) |
| 167 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE); |
| 168 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 169 | BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE); |
| 170 | jumpstack[stackptr].chain = chain; |
| 171 | jumpstack[stackptr].rule = rule; |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 172 | jumpstack[stackptr].rulenum = rulenum; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 173 | stackptr++; |
| 174 | /* fall through */ |
| 175 | case NFT_GOTO: |
| 176 | chain = data[NFT_REG_VERDICT].chain; |
| 177 | goto do_chain; |
| 178 | case NFT_RETURN: |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 179 | if (unlikely(pkt->skb->nf_trace)) |
| 180 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RETURN); |
| 181 | |
| 182 | /* fall through */ |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 183 | case NFT_CONTINUE: |
| 184 | break; |
| 185 | default: |
| 186 | WARN_ON(1); |
| 187 | } |
| 188 | |
| 189 | if (stackptr > 0) { |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 190 | if (unlikely(pkt->skb->nf_trace)) |
| 191 | nft_trace_packet(pkt, chain, ++rulenum, NFT_TRACE_RETURN); |
| 192 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 193 | stackptr--; |
| 194 | chain = jumpstack[stackptr].chain; |
| 195 | rule = jumpstack[stackptr].rule; |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 196 | rulenum = jumpstack[stackptr].rulenum; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 197 | goto next_rule; |
| 198 | } |
| 199 | |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 200 | if (unlikely(pkt->skb->nf_trace)) |
Pablo Neira Ayuso | 5467a51 | 2014-05-10 18:33:11 +0200 | [diff] [blame^] | 201 | nft_trace_packet(pkt, basechain, ++rulenum, NFT_TRACE_POLICY); |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 202 | |
Pablo Neira Ayuso | 5467a51 | 2014-05-10 18:33:11 +0200 | [diff] [blame^] | 203 | rcu_read_lock_bh(); |
| 204 | stats = rcu_dereference(nft_base_chain(basechain)->stats); |
| 205 | __this_cpu_inc(stats->pkts); |
| 206 | __this_cpu_add(stats->bytes, pkt->skb->len); |
| 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 | |
| 241 | return 0; |
| 242 | |
| 243 | err6: |
| 244 | nft_byteorder_module_exit(); |
| 245 | err5: |
| 246 | nft_bitwise_module_exit(); |
| 247 | err4: |
| 248 | nft_lookup_module_exit(); |
| 249 | err3: |
| 250 | nft_cmp_module_exit(); |
| 251 | err2: |
| 252 | nft_immediate_module_exit(); |
| 253 | err1: |
| 254 | return err; |
| 255 | } |
| 256 | |
| 257 | void nf_tables_core_module_exit(void) |
| 258 | { |
| 259 | nft_payload_module_exit(); |
| 260 | nft_byteorder_module_exit(); |
| 261 | nft_bitwise_module_exit(); |
| 262 | nft_lookup_module_exit(); |
| 263 | nft_cmp_module_exit(); |
| 264 | nft_immediate_module_exit(); |
| 265 | } |