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TOMOYO Linux Cross Reference
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_data data[NFT_REG_MAX + 1],
 31                          const struct nft_pktinfo *pkt)
 32 {
 33         const struct nft_log *priv = nft_expr_priv(expr);
 34         struct net *net = dev_net(pkt->in ? pkt->in : pkt->out);
 35 
 36         nf_log_packet(net, pkt->ops->pf, pkt->ops->hooknum, pkt->skb, pkt->in,
 37                       pkt->out, &priv->loginfo, "%s", priv->prefix);
 38 }
 39 
 40 static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = {
 41         [NFTA_LOG_GROUP]        = { .type = NLA_U16 },
 42         [NFTA_LOG_PREFIX]       = { .type = NLA_STRING },
 43         [NFTA_LOG_SNAPLEN]      = { .type = NLA_U32 },
 44         [NFTA_LOG_QTHRESHOLD]   = { .type = NLA_U16 },
 45         [NFTA_LOG_LEVEL]        = { .type = NLA_U32 },
 46         [NFTA_LOG_FLAGS]        = { .type = NLA_U32 },
 47 };
 48 
 49 static int nft_log_init(const struct nft_ctx *ctx,
 50                         const struct nft_expr *expr,
 51                         const struct nlattr * const tb[])
 52 {
 53         struct nft_log *priv = nft_expr_priv(expr);
 54         struct nf_loginfo *li = &priv->loginfo;
 55         const struct nlattr *nla;
 56         int ret;
 57 
 58         nla = tb[NFTA_LOG_PREFIX];
 59         if (nla != NULL) {
 60                 priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL);
 61                 if (priv->prefix == NULL)
 62                         return -ENOMEM;
 63                 nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1);
 64         } else {
 65                 priv->prefix = (char *)nft_log_null_prefix;
 66         }
 67 
 68         li->type = NF_LOG_TYPE_LOG;
 69         if (tb[NFTA_LOG_LEVEL] != NULL &&
 70             tb[NFTA_LOG_GROUP] != NULL)
 71                 return -EINVAL;
 72         if (tb[NFTA_LOG_GROUP] != NULL)
 73                 li->type = NF_LOG_TYPE_ULOG;
 74 
 75         switch (li->type) {
 76         case NF_LOG_TYPE_LOG:
 77                 if (tb[NFTA_LOG_LEVEL] != NULL) {
 78                         li->u.log.level =
 79                                 ntohl(nla_get_be32(tb[NFTA_LOG_LEVEL]));
 80                 } else {
 81                         li->u.log.level = 4;
 82                 }
 83                 if (tb[NFTA_LOG_FLAGS] != NULL) {
 84                         li->u.log.logflags =
 85                                 ntohl(nla_get_be32(tb[NFTA_LOG_FLAGS]));
 86                 }
 87                 break;
 88         case NF_LOG_TYPE_ULOG:
 89                 li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP]));
 90                 if (tb[NFTA_LOG_SNAPLEN] != NULL) {
 91                         li->u.ulog.copy_len =
 92                                 ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN]));
 93                 }
 94                 if (tb[NFTA_LOG_QTHRESHOLD] != NULL) {
 95                         li->u.ulog.qthreshold =
 96                                 ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD]));
 97                 }
 98                 break;
 99         }
100 
101         if (ctx->afi->family == NFPROTO_INET) {
102                 ret = nf_logger_find_get(NFPROTO_IPV4, li->type);
103                 if (ret < 0)
104                         return ret;
105 
106                 ret = nf_logger_find_get(NFPROTO_IPV6, li->type);
107                 if (ret < 0) {
108                         nf_logger_put(NFPROTO_IPV4, li->type);
109                         return ret;
110                 }
111                 return 0;
112         }
113 
114         return nf_logger_find_get(ctx->afi->family, li->type);
115 }
116 
117 static void nft_log_destroy(const struct nft_ctx *ctx,
118                             const struct nft_expr *expr)
119 {
120         struct nft_log *priv = nft_expr_priv(expr);
121         struct nf_loginfo *li = &priv->loginfo;
122 
123         if (priv->prefix != nft_log_null_prefix)
124                 kfree(priv->prefix);
125 
126         if (ctx->afi->family == NFPROTO_INET) {
127                 nf_logger_put(NFPROTO_IPV4, li->type);
128                 nf_logger_put(NFPROTO_IPV6, li->type);
129         } else {
130                 nf_logger_put(ctx->afi->family, li->type);
131         }
132 }
133 
134 static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr)
135 {
136         const struct nft_log *priv = nft_expr_priv(expr);
137         const struct nf_loginfo *li = &priv->loginfo;
138 
139         if (priv->prefix != nft_log_null_prefix)
140                 if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix))
141                         goto nla_put_failure;
142         switch (li->type) {
143         case NF_LOG_TYPE_LOG:
144                 if (nla_put_be32(skb, NFTA_LOG_LEVEL, htonl(li->u.log.level)))
145                         goto nla_put_failure;
146 
147                 if (li->u.log.logflags) {
148                         if (nla_put_be32(skb, NFTA_LOG_FLAGS,
149                                          htonl(li->u.log.logflags)))
150                                 goto nla_put_failure;
151                 }
152                 break;
153         case NF_LOG_TYPE_ULOG:
154                 if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group)))
155                         goto nla_put_failure;
156 
157                 if (li->u.ulog.copy_len) {
158                         if (nla_put_be32(skb, NFTA_LOG_SNAPLEN,
159                                          htonl(li->u.ulog.copy_len)))
160                                 goto nla_put_failure;
161                 }
162                 if (li->u.ulog.qthreshold) {
163                         if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD,
164                                          htons(li->u.ulog.qthreshold)))
165                                 goto nla_put_failure;
166                 }
167                 break;
168         }
169         return 0;
170 
171 nla_put_failure:
172         return -1;
173 }
174 
175 static struct nft_expr_type nft_log_type;
176 static const struct nft_expr_ops nft_log_ops = {
177         .type           = &nft_log_type,
178         .size           = NFT_EXPR_SIZE(sizeof(struct nft_log)),
179         .eval           = nft_log_eval,
180         .init           = nft_log_init,
181         .destroy        = nft_log_destroy,
182         .dump           = nft_log_dump,
183 };
184 
185 static struct nft_expr_type nft_log_type __read_mostly = {
186         .name           = "log",
187         .ops            = &nft_log_ops,
188         .policy         = nft_log_policy,
189         .maxattr        = NFTA_LOG_MAX,
190         .owner          = THIS_MODULE,
191 };
192 
193 static int __init nft_log_module_init(void)
194 {
195         return nft_register_expr(&nft_log_type);
196 }
197 
198 static void __exit nft_log_module_exit(void)
199 {
200         nft_unregister_expr(&nft_log_type);
201 }
202 
203 module_init(nft_log_module_init);
204 module_exit(nft_log_module_exit);
205 
206 MODULE_LICENSE("GPL");
207 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
208 MODULE_ALIAS_NFT_EXPR("log");
209 

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