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1 | /* |
2 | * Copyright (c) 2008-2009 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/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; |
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 | |
35 | nf_log_packet(net, pkt->ops->pf, pkt->ops->hooknum, pkt->skb, pkt->in, |
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 | |
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 | |
77 | static void nft_log_destroy(const struct nft_ctx *ctx, |
78 | const struct nft_expr *expr) |
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 | |
111 | static struct nft_expr_type nft_log_type; |
112 | static const struct nft_expr_ops nft_log_ops = { |
113 | .type = &nft_log_type, |
114 | .size = NFT_EXPR_SIZE(sizeof(struct nft_log)), |
115 | .eval = nft_log_eval, |
116 | .init = nft_log_init, |
117 | .destroy = nft_log_destroy, |
118 | .dump = nft_log_dump, |
119 | }; |
120 | |
121 | static struct nft_expr_type nft_log_type __read_mostly = { |
122 | .name = "log", |
123 | .ops = &nft_log_ops, |
124 | .policy = nft_log_policy, |
125 | .maxattr = NFTA_LOG_MAX, |
126 | .owner = THIS_MODULE, |
127 | }; |
128 | |
129 | static int __init nft_log_module_init(void) |
130 | { |
131 | return nft_register_expr(&nft_log_type); |
132 | } |
133 | |
134 | static void __exit nft_log_module_exit(void) |
135 | { |
136 | nft_unregister_expr(&nft_log_type); |
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"); |
145 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9