Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 3 | * Copyright (c) 2012-2014 Pablo Neira Ayuso <pablo@netfilter.org> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/netlink.h> |
| 16 | #include <linux/netfilter.h> |
| 17 | #include <linux/netfilter/nf_tables.h> |
| 18 | #include <net/netfilter/nf_tables.h> |
| 19 | #include <net/netfilter/nf_log.h> |
| 20 | #include <linux/netdevice.h> |
| 21 | |
| 22 | static const char *nft_log_null_prefix = ""; |
| 23 | |
| 24 | struct nft_log { |
| 25 | struct nf_loginfo loginfo; |
| 26 | char *prefix; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 27 | }; |
| 28 | |
| 29 | static void nft_log_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 30 | struct nft_regs *regs, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 31 | const struct nft_pktinfo *pkt) |
| 32 | { |
| 33 | const struct nft_log *priv = nft_expr_priv(expr); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 34 | |
Pablo Neira Ayuso | 0e5a1c7 | 2016-11-03 10:56:26 +0100 | [diff] [blame] | 35 | nf_log_packet(nft_net(pkt), nft_pf(pkt), nft_hook(pkt), pkt->skb, |
| 36 | nft_in(pkt), nft_out(pkt), &priv->loginfo, "%s", |
| 37 | priv->prefix); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = { |
| 41 | [NFTA_LOG_GROUP] = { .type = NLA_U16 }, |
Liping Zhang | 5ce6b04 | 2017-01-22 22:10:32 +0800 | [diff] [blame] | 42 | [NFTA_LOG_PREFIX] = { .type = NLA_STRING, |
| 43 | .len = NF_LOG_PREFIXLEN - 1 }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 44 | [NFTA_LOG_SNAPLEN] = { .type = NLA_U32 }, |
| 45 | [NFTA_LOG_QTHRESHOLD] = { .type = NLA_U16 }, |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 46 | [NFTA_LOG_LEVEL] = { .type = NLA_U32 }, |
| 47 | [NFTA_LOG_FLAGS] = { .type = NLA_U32 }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 48 | }; |
| 49 | |
| 50 | static int nft_log_init(const struct nft_ctx *ctx, |
| 51 | const struct nft_expr *expr, |
| 52 | const struct nlattr * const tb[]) |
| 53 | { |
| 54 | struct nft_log *priv = nft_expr_priv(expr); |
| 55 | struct nf_loginfo *li = &priv->loginfo; |
| 56 | const struct nlattr *nla; |
Liping Zhang | c2d9a42 | 2016-07-18 20:44:15 +0800 | [diff] [blame] | 57 | int err; |
| 58 | |
| 59 | li->type = NF_LOG_TYPE_LOG; |
| 60 | if (tb[NFTA_LOG_LEVEL] != NULL && |
| 61 | tb[NFTA_LOG_GROUP] != NULL) |
| 62 | return -EINVAL; |
Liping Zhang | ff107d2 | 2016-09-25 16:35:56 +0800 | [diff] [blame] | 63 | if (tb[NFTA_LOG_GROUP] != NULL) { |
Liping Zhang | c2d9a42 | 2016-07-18 20:44:15 +0800 | [diff] [blame] | 64 | li->type = NF_LOG_TYPE_ULOG; |
Liping Zhang | ff107d2 | 2016-09-25 16:35:56 +0800 | [diff] [blame] | 65 | if (tb[NFTA_LOG_FLAGS] != NULL) |
| 66 | return -EINVAL; |
| 67 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 68 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 69 | nla = tb[NFTA_LOG_PREFIX]; |
| 70 | if (nla != NULL) { |
| 71 | priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL); |
| 72 | if (priv->prefix == NULL) |
| 73 | return -ENOMEM; |
| 74 | nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1); |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 75 | } else { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 76 | priv->prefix = (char *)nft_log_null_prefix; |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 77 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 78 | |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 79 | switch (li->type) { |
| 80 | case NF_LOG_TYPE_LOG: |
| 81 | if (tb[NFTA_LOG_LEVEL] != NULL) { |
| 82 | li->u.log.level = |
Fengguang Wu | 5cbfda2 | 2014-06-29 13:55:08 +0200 | [diff] [blame] | 83 | ntohl(nla_get_be32(tb[NFTA_LOG_LEVEL])); |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 84 | } else { |
Joe Perches | a81b2ce | 2015-03-23 11:50:10 -0700 | [diff] [blame] | 85 | li->u.log.level = LOGLEVEL_WARNING; |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 86 | } |
Liping Zhang | 1bc4e01 | 2016-07-18 20:44:16 +0800 | [diff] [blame] | 87 | if (li->u.log.level > LOGLEVEL_DEBUG) { |
| 88 | err = -EINVAL; |
| 89 | goto err1; |
| 90 | } |
| 91 | |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 92 | if (tb[NFTA_LOG_FLAGS] != NULL) { |
| 93 | li->u.log.logflags = |
| 94 | ntohl(nla_get_be32(tb[NFTA_LOG_FLAGS])); |
Liping Zhang | ff107d2 | 2016-09-25 16:35:56 +0800 | [diff] [blame] | 95 | if (li->u.log.logflags & ~NF_LOG_MASK) { |
| 96 | err = -EINVAL; |
| 97 | goto err1; |
| 98 | } |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 99 | } |
| 100 | break; |
| 101 | case NF_LOG_TYPE_ULOG: |
| 102 | li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP])); |
| 103 | if (tb[NFTA_LOG_SNAPLEN] != NULL) { |
Liping Zhang | cc37c1a | 2016-07-18 20:44:17 +0800 | [diff] [blame] | 104 | li->u.ulog.flags |= NF_LOG_F_COPY_LEN; |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 105 | li->u.ulog.copy_len = |
| 106 | ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN])); |
| 107 | } |
| 108 | if (tb[NFTA_LOG_QTHRESHOLD] != NULL) { |
| 109 | li->u.ulog.qthreshold = |
| 110 | ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD])); |
| 111 | } |
| 112 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 113 | } |
| 114 | |
Liping Zhang | c2d9a42 | 2016-07-18 20:44:15 +0800 | [diff] [blame] | 115 | err = nf_logger_find_get(ctx->afi->family, li->type); |
| 116 | if (err < 0) |
| 117 | goto err1; |
| 118 | |
| 119 | return 0; |
| 120 | |
| 121 | err1: |
| 122 | if (priv->prefix != nft_log_null_prefix) |
| 123 | kfree(priv->prefix); |
| 124 | return err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 125 | } |
| 126 | |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 127 | static void nft_log_destroy(const struct nft_ctx *ctx, |
| 128 | const struct nft_expr *expr) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 129 | { |
| 130 | struct nft_log *priv = nft_expr_priv(expr); |
Pablo Neira Ayuso | 85d30e2 | 2014-06-25 13:29:15 +0200 | [diff] [blame] | 131 | struct nf_loginfo *li = &priv->loginfo; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 132 | |
| 133 | if (priv->prefix != nft_log_null_prefix) |
| 134 | kfree(priv->prefix); |
Pablo Neira Ayuso | 85d30e2 | 2014-06-25 13:29:15 +0200 | [diff] [blame] | 135 | |
Liping Zhang | f3bb533 | 2016-06-08 20:43:17 +0800 | [diff] [blame] | 136 | nf_logger_put(ctx->afi->family, li->type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 140 | { |
| 141 | const struct nft_log *priv = nft_expr_priv(expr); |
| 142 | const struct nf_loginfo *li = &priv->loginfo; |
| 143 | |
| 144 | if (priv->prefix != nft_log_null_prefix) |
| 145 | if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix)) |
| 146 | goto nla_put_failure; |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 147 | switch (li->type) { |
| 148 | case NF_LOG_TYPE_LOG: |
| 149 | if (nla_put_be32(skb, NFTA_LOG_LEVEL, htonl(li->u.log.level))) |
| 150 | goto nla_put_failure; |
| 151 | |
| 152 | if (li->u.log.logflags) { |
| 153 | if (nla_put_be32(skb, NFTA_LOG_FLAGS, |
| 154 | htonl(li->u.log.logflags))) |
| 155 | goto nla_put_failure; |
| 156 | } |
| 157 | break; |
| 158 | case NF_LOG_TYPE_ULOG: |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 159 | if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group))) |
| 160 | goto nla_put_failure; |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 161 | |
Liping Zhang | cc37c1a | 2016-07-18 20:44:17 +0800 | [diff] [blame] | 162 | if (li->u.ulog.flags & NF_LOG_F_COPY_LEN) { |
Pablo Neira Ayuso | 09d27b8 | 2014-06-25 13:37:13 +0200 | [diff] [blame] | 163 | if (nla_put_be32(skb, NFTA_LOG_SNAPLEN, |
| 164 | htonl(li->u.ulog.copy_len))) |
| 165 | goto nla_put_failure; |
| 166 | } |
| 167 | if (li->u.ulog.qthreshold) { |
| 168 | if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD, |
| 169 | htons(li->u.ulog.qthreshold))) |
| 170 | goto nla_put_failure; |
| 171 | } |
| 172 | break; |
| 173 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 174 | return 0; |
| 175 | |
| 176 | nla_put_failure: |
| 177 | return -1; |
| 178 | } |
| 179 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 180 | static struct nft_expr_type nft_log_type; |
| 181 | static const struct nft_expr_ops nft_log_ops = { |
| 182 | .type = &nft_log_type, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 183 | .size = NFT_EXPR_SIZE(sizeof(struct nft_log)), |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 184 | .eval = nft_log_eval, |
| 185 | .init = nft_log_init, |
| 186 | .destroy = nft_log_destroy, |
| 187 | .dump = nft_log_dump, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 188 | }; |
| 189 | |
| 190 | static struct nft_expr_type nft_log_type __read_mostly = { |
| 191 | .name = "log", |
| 192 | .ops = &nft_log_ops, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 193 | .policy = nft_log_policy, |
| 194 | .maxattr = NFTA_LOG_MAX, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 195 | .owner = THIS_MODULE, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 196 | }; |
| 197 | |
| 198 | static int __init nft_log_module_init(void) |
| 199 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 200 | return nft_register_expr(&nft_log_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 201 | } |
| 202 | |
| 203 | static void __exit nft_log_module_exit(void) |
| 204 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 205 | nft_unregister_expr(&nft_log_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | module_init(nft_log_module_init); |
| 209 | module_exit(nft_log_module_exit); |
| 210 | |
| 211 | MODULE_LICENSE("GPL"); |
| 212 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 213 | MODULE_ALIAS_NFT_EXPR("log"); |