Commit | Line | Data |
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96518518 | 1 | /* |
ef1f7df9 | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
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/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/netlink.h> | |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/netfilter/nf_tables.h> | |
17 | #include <net/netfilter/nf_tables.h> | |
18 | #include <net/netfilter/nf_log.h> | |
19 | #include <linux/netdevice.h> | |
20 | ||
21 | static const char *nft_log_null_prefix = ""; | |
22 | ||
23 | struct nft_log { | |
24 | struct nf_loginfo loginfo; | |
25 | char *prefix; | |
96518518 PM |
26 | }; |
27 | ||
28 | static void nft_log_eval(const struct nft_expr *expr, | |
29 | struct nft_data data[NFT_REG_MAX + 1], | |
30 | const struct nft_pktinfo *pkt) | |
31 | { | |
32 | const struct nft_log *priv = nft_expr_priv(expr); | |
33 | struct net *net = dev_net(pkt->in ? pkt->in : pkt->out); | |
34 | ||
b8ecbee6 | 35 | nf_log_packet(net, pkt->ops->pf, pkt->ops->hooknum, 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 }, | |
44 | }; | |
45 | ||
46 | static int nft_log_init(const struct nft_ctx *ctx, | |
47 | const struct nft_expr *expr, | |
48 | const struct nlattr * const tb[]) | |
49 | { | |
50 | struct nft_log *priv = nft_expr_priv(expr); | |
51 | struct nf_loginfo *li = &priv->loginfo; | |
52 | const struct nlattr *nla; | |
53 | ||
96518518 PM |
54 | nla = tb[NFTA_LOG_PREFIX]; |
55 | if (nla != NULL) { | |
56 | priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL); | |
57 | if (priv->prefix == NULL) | |
58 | return -ENOMEM; | |
59 | nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1); | |
60 | } else | |
61 | priv->prefix = (char *)nft_log_null_prefix; | |
62 | ||
63 | li->type = NF_LOG_TYPE_ULOG; | |
64 | if (tb[NFTA_LOG_GROUP] != NULL) | |
65 | li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP])); | |
66 | ||
67 | if (tb[NFTA_LOG_SNAPLEN] != NULL) | |
68 | li->u.ulog.copy_len = ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN])); | |
69 | if (tb[NFTA_LOG_QTHRESHOLD] != NULL) { | |
70 | li->u.ulog.qthreshold = | |
71 | ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD])); | |
72 | } | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
62472bce PM |
77 | static void nft_log_destroy(const struct nft_ctx *ctx, |
78 | const struct nft_expr *expr) | |
96518518 PM |
79 | { |
80 | struct nft_log *priv = nft_expr_priv(expr); | |
81 | ||
82 | if (priv->prefix != nft_log_null_prefix) | |
83 | kfree(priv->prefix); | |
84 | } | |
85 | ||
86 | static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
87 | { | |
88 | const struct nft_log *priv = nft_expr_priv(expr); | |
89 | const struct nf_loginfo *li = &priv->loginfo; | |
90 | ||
91 | if (priv->prefix != nft_log_null_prefix) | |
92 | if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix)) | |
93 | goto nla_put_failure; | |
94 | if (li->u.ulog.group) | |
95 | if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group))) | |
96 | goto nla_put_failure; | |
97 | if (li->u.ulog.copy_len) | |
98 | if (nla_put_be32(skb, NFTA_LOG_SNAPLEN, | |
99 | htonl(li->u.ulog.copy_len))) | |
100 | goto nla_put_failure; | |
101 | if (li->u.ulog.qthreshold) | |
102 | if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD, | |
103 | htons(li->u.ulog.qthreshold))) | |
104 | goto nla_put_failure; | |
105 | return 0; | |
106 | ||
107 | nla_put_failure: | |
108 | return -1; | |
109 | } | |
110 | ||
ef1f7df9 PM |
111 | static struct nft_expr_type nft_log_type; |
112 | static const struct nft_expr_ops nft_log_ops = { | |
113 | .type = &nft_log_type, | |
96518518 | 114 | .size = NFT_EXPR_SIZE(sizeof(struct nft_log)), |
96518518 PM |
115 | .eval = nft_log_eval, |
116 | .init = nft_log_init, | |
117 | .destroy = nft_log_destroy, | |
118 | .dump = nft_log_dump, | |
ef1f7df9 PM |
119 | }; |
120 | ||
121 | static struct nft_expr_type nft_log_type __read_mostly = { | |
122 | .name = "log", | |
123 | .ops = &nft_log_ops, | |
96518518 PM |
124 | .policy = nft_log_policy, |
125 | .maxattr = NFTA_LOG_MAX, | |
ef1f7df9 | 126 | .owner = THIS_MODULE, |
96518518 PM |
127 | }; |
128 | ||
129 | static int __init nft_log_module_init(void) | |
130 | { | |
ef1f7df9 | 131 | return nft_register_expr(&nft_log_type); |
96518518 PM |
132 | } |
133 | ||
134 | static void __exit nft_log_module_exit(void) | |
135 | { | |
ef1f7df9 | 136 | nft_unregister_expr(&nft_log_type); |
96518518 PM |
137 | } |
138 | ||
139 | module_init(nft_log_module_init); | |
140 | module_exit(nft_log_module_exit); | |
141 | ||
142 | MODULE_LICENSE("GPL"); | |
143 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
144 | MODULE_ALIAS_NFT_EXPR("log"); |