Commit | Line | Data |
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96518518 | 1 | /* |
ef1f7df9 | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
09d27b88 | 3 | * Copyright (c) 2012-2014 Pablo Neira Ayuso <pablo@netfilter.org> |
96518518 PM |
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; | |
96518518 PM |
27 | }; |
28 | ||
29 | static void nft_log_eval(const struct nft_expr *expr, | |
a55e22e9 | 30 | struct nft_regs *regs, |
96518518 PM |
31 | const struct nft_pktinfo *pkt) |
32 | { | |
33 | const struct nft_log *priv = nft_expr_priv(expr); | |
96518518 | 34 | |
88182a0e | 35 | nf_log_packet(pkt->net, pkt->pf, pkt->hook, pkt->skb, pkt->in, |
96518518 PM |
36 | pkt->out, &priv->loginfo, "%s", priv->prefix); |
37 | } | |
38 | ||
39 | static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = { | |
40 | [NFTA_LOG_GROUP] = { .type = NLA_U16 }, | |
41 | [NFTA_LOG_PREFIX] = { .type = NLA_STRING }, | |
42 | [NFTA_LOG_SNAPLEN] = { .type = NLA_U32 }, | |
43 | [NFTA_LOG_QTHRESHOLD] = { .type = NLA_U16 }, | |
09d27b88 PNA |
44 | [NFTA_LOG_LEVEL] = { .type = NLA_U32 }, |
45 | [NFTA_LOG_FLAGS] = { .type = NLA_U32 }, | |
96518518 PM |
46 | }; |
47 | ||
48 | static int nft_log_init(const struct nft_ctx *ctx, | |
49 | const struct nft_expr *expr, | |
50 | const struct nlattr * const tb[]) | |
51 | { | |
52 | struct nft_log *priv = nft_expr_priv(expr); | |
53 | struct nf_loginfo *li = &priv->loginfo; | |
54 | const struct nlattr *nla; | |
85d30e24 | 55 | int ret; |
96518518 | 56 | |
96518518 PM |
57 | nla = tb[NFTA_LOG_PREFIX]; |
58 | if (nla != NULL) { | |
59 | priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL); | |
60 | if (priv->prefix == NULL) | |
61 | return -ENOMEM; | |
62 | nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1); | |
09d27b88 | 63 | } else { |
96518518 | 64 | priv->prefix = (char *)nft_log_null_prefix; |
09d27b88 | 65 | } |
96518518 | 66 | |
09d27b88 PNA |
67 | li->type = NF_LOG_TYPE_LOG; |
68 | if (tb[NFTA_LOG_LEVEL] != NULL && | |
69 | tb[NFTA_LOG_GROUP] != NULL) | |
70 | return -EINVAL; | |
96518518 | 71 | if (tb[NFTA_LOG_GROUP] != NULL) |
09d27b88 PNA |
72 | li->type = NF_LOG_TYPE_ULOG; |
73 | ||
74 | switch (li->type) { | |
75 | case NF_LOG_TYPE_LOG: | |
76 | if (tb[NFTA_LOG_LEVEL] != NULL) { | |
77 | li->u.log.level = | |
5cbfda20 | 78 | ntohl(nla_get_be32(tb[NFTA_LOG_LEVEL])); |
09d27b88 | 79 | } else { |
a81b2ce8 | 80 | li->u.log.level = LOGLEVEL_WARNING; |
09d27b88 PNA |
81 | } |
82 | if (tb[NFTA_LOG_FLAGS] != NULL) { | |
83 | li->u.log.logflags = | |
84 | ntohl(nla_get_be32(tb[NFTA_LOG_FLAGS])); | |
85 | } | |
86 | break; | |
87 | case NF_LOG_TYPE_ULOG: | |
96518518 | 88 | li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP])); |
09d27b88 PNA |
89 | if (tb[NFTA_LOG_SNAPLEN] != NULL) { |
90 | li->u.ulog.copy_len = | |
91 | ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN])); | |
92 | } | |
93 | if (tb[NFTA_LOG_QTHRESHOLD] != NULL) { | |
94 | li->u.ulog.qthreshold = | |
95 | ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD])); | |
96 | } | |
97 | break; | |
96518518 PM |
98 | } |
99 | ||
85d30e24 PNA |
100 | if (ctx->afi->family == NFPROTO_INET) { |
101 | ret = nf_logger_find_get(NFPROTO_IPV4, li->type); | |
102 | if (ret < 0) | |
103 | return ret; | |
104 | ||
105 | ret = nf_logger_find_get(NFPROTO_IPV6, li->type); | |
106 | if (ret < 0) { | |
107 | nf_logger_put(NFPROTO_IPV4, li->type); | |
108 | return ret; | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | ||
113 | return nf_logger_find_get(ctx->afi->family, li->type); | |
96518518 PM |
114 | } |
115 | ||
62472bce PM |
116 | static void nft_log_destroy(const struct nft_ctx *ctx, |
117 | const struct nft_expr *expr) | |
96518518 PM |
118 | { |
119 | struct nft_log *priv = nft_expr_priv(expr); | |
85d30e24 | 120 | struct nf_loginfo *li = &priv->loginfo; |
96518518 PM |
121 | |
122 | if (priv->prefix != nft_log_null_prefix) | |
123 | kfree(priv->prefix); | |
85d30e24 PNA |
124 | |
125 | if (ctx->afi->family == NFPROTO_INET) { | |
126 | nf_logger_put(NFPROTO_IPV4, li->type); | |
127 | nf_logger_put(NFPROTO_IPV6, li->type); | |
128 | } else { | |
129 | nf_logger_put(ctx->afi->family, li->type); | |
130 | } | |
96518518 PM |
131 | } |
132 | ||
133 | static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
134 | { | |
135 | const struct nft_log *priv = nft_expr_priv(expr); | |
136 | const struct nf_loginfo *li = &priv->loginfo; | |
137 | ||
138 | if (priv->prefix != nft_log_null_prefix) | |
139 | if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix)) | |
140 | goto nla_put_failure; | |
09d27b88 PNA |
141 | switch (li->type) { |
142 | case NF_LOG_TYPE_LOG: | |
143 | if (nla_put_be32(skb, NFTA_LOG_LEVEL, htonl(li->u.log.level))) | |
96518518 | 144 | goto nla_put_failure; |
09d27b88 PNA |
145 | |
146 | if (li->u.log.logflags) { | |
147 | if (nla_put_be32(skb, NFTA_LOG_FLAGS, | |
148 | htonl(li->u.log.logflags))) | |
149 | goto nla_put_failure; | |
150 | } | |
151 | break; | |
152 | case NF_LOG_TYPE_ULOG: | |
153 | if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group))) | |
96518518 | 154 | goto nla_put_failure; |
09d27b88 PNA |
155 | |
156 | if (li->u.ulog.copy_len) { | |
157 | if (nla_put_be32(skb, NFTA_LOG_SNAPLEN, | |
158 | htonl(li->u.ulog.copy_len))) | |
159 | goto nla_put_failure; | |
160 | } | |
161 | if (li->u.ulog.qthreshold) { | |
162 | if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD, | |
163 | htons(li->u.ulog.qthreshold))) | |
164 | goto nla_put_failure; | |
165 | } | |
166 | break; | |
167 | } | |
96518518 PM |
168 | return 0; |
169 | ||
170 | nla_put_failure: | |
171 | return -1; | |
172 | } | |
173 | ||
ef1f7df9 PM |
174 | static struct nft_expr_type nft_log_type; |
175 | static const struct nft_expr_ops nft_log_ops = { | |
176 | .type = &nft_log_type, | |
96518518 | 177 | .size = NFT_EXPR_SIZE(sizeof(struct nft_log)), |
96518518 PM |
178 | .eval = nft_log_eval, |
179 | .init = nft_log_init, | |
180 | .destroy = nft_log_destroy, | |
181 | .dump = nft_log_dump, | |
ef1f7df9 PM |
182 | }; |
183 | ||
184 | static struct nft_expr_type nft_log_type __read_mostly = { | |
185 | .name = "log", | |
186 | .ops = &nft_log_ops, | |
96518518 PM |
187 | .policy = nft_log_policy, |
188 | .maxattr = NFTA_LOG_MAX, | |
ef1f7df9 | 189 | .owner = THIS_MODULE, |
96518518 PM |
190 | }; |
191 | ||
192 | static int __init nft_log_module_init(void) | |
193 | { | |
ef1f7df9 | 194 | return nft_register_expr(&nft_log_type); |
96518518 PM |
195 | } |
196 | ||
197 | static void __exit nft_log_module_exit(void) | |
198 | { | |
ef1f7df9 | 199 | nft_unregister_expr(&nft_log_type); |
96518518 PM |
200 | } |
201 | ||
202 | module_init(nft_log_module_init); | |
203 | module_exit(nft_log_module_exit); | |
204 | ||
205 | MODULE_LICENSE("GPL"); | |
206 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
207 | MODULE_ALIAS_NFT_EXPR("log"); |