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Linux/net/netfilter/nft_log.c

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  1 /*
  2  * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
  3  * Copyright (c) 2012-2014 Pablo Neira Ayuso <pablo@netfilter.org>
  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;
 27 };
 28 
 29 static void nft_log_eval(const struct nft_expr *expr,
 30                          struct nft_regs *regs,
 31                          const struct nft_pktinfo *pkt)
 32 {
 33         const struct nft_log *priv = nft_expr_priv(expr);
 34 
 35         nf_log_packet(pkt->net, pkt->pf, pkt->hook, 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         [NFTA_LOG_LEVEL]        = { .type = NLA_U32 },
 45         [NFTA_LOG_FLAGS]        = { .type = NLA_U32 },
 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;
 55         int ret;
 56 
 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);
 63         } else {
 64                 priv->prefix = (char *)nft_log_null_prefix;
 65         }
 66 
 67         li->type = NF_LOG_TYPE_LOG;
 68         if (tb[NFTA_LOG_LEVEL] != NULL &&
 69             tb[NFTA_LOG_GROUP] != NULL)
 70                 return -EINVAL;
 71         if (tb[NFTA_LOG_GROUP] != NULL)
 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 =
 78                                 ntohl(nla_get_be32(tb[NFTA_LOG_LEVEL]));
 79                 } else {
 80                         li->u.log.level = LOGLEVEL_WARNING;
 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:
 88                 li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP]));
 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;
 98         }
 99 
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);
114 }
115 
116 static void nft_log_destroy(const struct nft_ctx *ctx,
117                             const struct nft_expr *expr)
118 {
119         struct nft_log *priv = nft_expr_priv(expr);
120         struct nf_loginfo *li = &priv->loginfo;
121 
122         if (priv->prefix != nft_log_null_prefix)
123                 kfree(priv->prefix);
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         }
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;
141         switch (li->type) {
142         case NF_LOG_TYPE_LOG:
143                 if (nla_put_be32(skb, NFTA_LOG_LEVEL, htonl(li->u.log.level)))
144                         goto nla_put_failure;
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)))
154                         goto nla_put_failure;
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         }
168         return 0;
169 
170 nla_put_failure:
171         return -1;
172 }
173 
174 static struct nft_expr_type nft_log_type;
175 static const struct nft_expr_ops nft_log_ops = {
176         .type           = &nft_log_type,
177         .size           = NFT_EXPR_SIZE(sizeof(struct nft_log)),
178         .eval           = nft_log_eval,
179         .init           = nft_log_init,
180         .destroy        = nft_log_destroy,
181         .dump           = nft_log_dump,
182 };
183 
184 static struct nft_expr_type nft_log_type __read_mostly = {
185         .name           = "log",
186         .ops            = &nft_log_ops,
187         .policy         = nft_log_policy,
188         .maxattr        = NFTA_LOG_MAX,
189         .owner          = THIS_MODULE,
190 };
191 
192 static int __init nft_log_module_init(void)
193 {
194         return nft_register_expr(&nft_log_type);
195 }
196 
197 static void __exit nft_log_module_exit(void)
198 {
199         nft_unregister_expr(&nft_log_type);
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");
208 

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