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TOMOYO Linux Cross Reference
Linux/net/netfilter/xt_AUDIT.c

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  1 /*
  2  * Creates audit record for dropped/accepted packets
  3  *
  4  * (C) 2010-2011 Thomas Graf <tgraf@redhat.com>
  5  * (C) 2010-2011 Red Hat, Inc.
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10 */
 11 
 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 13 
 14 #include <linux/audit.h>
 15 #include <linux/module.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/tcp.h>
 18 #include <linux/udp.h>
 19 #include <linux/if_arp.h>
 20 #include <linux/netfilter/x_tables.h>
 21 #include <linux/netfilter/xt_AUDIT.h>
 22 #include <linux/netfilter_bridge/ebtables.h>
 23 #include <net/ipv6.h>
 24 #include <net/ip.h>
 25 
 26 MODULE_LICENSE("GPL");
 27 MODULE_AUTHOR("Thomas Graf <tgraf@redhat.com>");
 28 MODULE_DESCRIPTION("Xtables: creates audit records for dropped/accepted packets");
 29 MODULE_ALIAS("ipt_AUDIT");
 30 MODULE_ALIAS("ip6t_AUDIT");
 31 MODULE_ALIAS("ebt_AUDIT");
 32 MODULE_ALIAS("arpt_AUDIT");
 33 
 34 static void audit_proto(struct audit_buffer *ab, struct sk_buff *skb,
 35                         unsigned int proto, unsigned int offset)
 36 {
 37         switch (proto) {
 38         case IPPROTO_TCP:
 39         case IPPROTO_UDP:
 40         case IPPROTO_UDPLITE: {
 41                 const __be16 *pptr;
 42                 __be16 _ports[2];
 43 
 44                 pptr = skb_header_pointer(skb, offset, sizeof(_ports), _ports);
 45                 if (pptr == NULL) {
 46                         audit_log_format(ab, " truncated=1");
 47                         return;
 48                 }
 49 
 50                 audit_log_format(ab, " sport=%hu dport=%hu",
 51                                  ntohs(pptr[0]), ntohs(pptr[1]));
 52                 }
 53                 break;
 54 
 55         case IPPROTO_ICMP:
 56         case IPPROTO_ICMPV6: {
 57                 const u8 *iptr;
 58                 u8 _ih[2];
 59 
 60                 iptr = skb_header_pointer(skb, offset, sizeof(_ih), &_ih);
 61                 if (iptr == NULL) {
 62                         audit_log_format(ab, " truncated=1");
 63                         return;
 64                 }
 65 
 66                 audit_log_format(ab, " icmptype=%hhu icmpcode=%hhu",
 67                                  iptr[0], iptr[1]);
 68 
 69                 }
 70                 break;
 71         }
 72 }
 73 
 74 static void audit_ip4(struct audit_buffer *ab, struct sk_buff *skb)
 75 {
 76         struct iphdr _iph;
 77         const struct iphdr *ih;
 78 
 79         ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
 80         if (!ih) {
 81                 audit_log_format(ab, " truncated=1");
 82                 return;
 83         }
 84 
 85         audit_log_format(ab, " saddr=%pI4 daddr=%pI4 ipid=%hu proto=%hhu",
 86                 &ih->saddr, &ih->daddr, ntohs(ih->id), ih->protocol);
 87 
 88         if (ntohs(ih->frag_off) & IP_OFFSET) {
 89                 audit_log_format(ab, " frag=1");
 90                 return;
 91         }
 92 
 93         audit_proto(ab, skb, ih->protocol, ih->ihl * 4);
 94 }
 95 
 96 static void audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
 97 {
 98         struct ipv6hdr _ip6h;
 99         const struct ipv6hdr *ih;
100         u8 nexthdr;
101         __be16 frag_off;
102         int offset;
103 
104         ih = skb_header_pointer(skb, skb_network_offset(skb), sizeof(_ip6h), &_ip6h);
105         if (!ih) {
106                 audit_log_format(ab, " truncated=1");
107                 return;
108         }
109 
110         nexthdr = ih->nexthdr;
111         offset = ipv6_skip_exthdr(skb, skb_network_offset(skb) + sizeof(_ip6h),
112                                   &nexthdr, &frag_off);
113 
114         audit_log_format(ab, " saddr=%pI6c daddr=%pI6c proto=%hhu",
115                          &ih->saddr, &ih->daddr, nexthdr);
116 
117         if (offset)
118                 audit_proto(ab, skb, nexthdr, offset);
119 }
120 
121 static unsigned int
122 audit_tg(struct sk_buff *skb, const struct xt_action_param *par)
123 {
124         const struct xt_audit_info *info = par->targinfo;
125         struct audit_buffer *ab;
126 
127         if (audit_enabled == 0)
128                 goto errout;
129 
130         ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
131         if (ab == NULL)
132                 goto errout;
133 
134         audit_log_format(ab, "action=%hhu hook=%u len=%u inif=%s outif=%s",
135                          info->type, par->hooknum, skb->len,
136                          par->in ? par->in->name : "?",
137                          par->out ? par->out->name : "?");
138 
139         if (skb->mark)
140                 audit_log_format(ab, " mark=%#x", skb->mark);
141 
142         if (skb->dev && skb->dev->type == ARPHRD_ETHER) {
143                 audit_log_format(ab, " smac=%pM dmac=%pM macproto=0x%04x",
144                                  eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
145                                  ntohs(eth_hdr(skb)->h_proto));
146 
147                 if (par->family == NFPROTO_BRIDGE) {
148                         switch (eth_hdr(skb)->h_proto) {
149                         case htons(ETH_P_IP):
150                                 audit_ip4(ab, skb);
151                                 break;
152 
153                         case htons(ETH_P_IPV6):
154                                 audit_ip6(ab, skb);
155                                 break;
156                         }
157                 }
158         }
159 
160         switch (par->family) {
161         case NFPROTO_IPV4:
162                 audit_ip4(ab, skb);
163                 break;
164 
165         case NFPROTO_IPV6:
166                 audit_ip6(ab, skb);
167                 break;
168         }
169 
170 #ifdef CONFIG_NETWORK_SECMARK
171         if (skb->secmark)
172                 audit_log_secctx(ab, skb->secmark);
173 #endif
174 
175         audit_log_end(ab);
176 
177 errout:
178         return XT_CONTINUE;
179 }
180 
181 static unsigned int
182 audit_tg_ebt(struct sk_buff *skb, const struct xt_action_param *par)
183 {
184         audit_tg(skb, par);
185         return EBT_CONTINUE;
186 }
187 
188 static int audit_tg_check(const struct xt_tgchk_param *par)
189 {
190         const struct xt_audit_info *info = par->targinfo;
191 
192         if (info->type > XT_AUDIT_TYPE_MAX) {
193                 pr_info("Audit type out of range (valid range: 0..%hhu)\n",
194                         XT_AUDIT_TYPE_MAX);
195                 return -ERANGE;
196         }
197 
198         return 0;
199 }
200 
201 static struct xt_target audit_tg_reg[] __read_mostly = {
202         {
203                 .name           = "AUDIT",
204                 .family         = NFPROTO_UNSPEC,
205                 .target         = audit_tg,
206                 .targetsize     = sizeof(struct xt_audit_info),
207                 .checkentry     = audit_tg_check,
208                 .me             = THIS_MODULE,
209         },
210         {
211                 .name           = "AUDIT",
212                 .family         = NFPROTO_BRIDGE,
213                 .target         = audit_tg_ebt,
214                 .targetsize     = sizeof(struct xt_audit_info),
215                 .checkentry     = audit_tg_check,
216                 .me             = THIS_MODULE,
217         },
218 };
219 
220 static int __init audit_tg_init(void)
221 {
222         return xt_register_targets(audit_tg_reg, ARRAY_SIZE(audit_tg_reg));
223 }
224 
225 static void __exit audit_tg_exit(void)
226 {
227         xt_unregister_targets(audit_tg_reg, ARRAY_SIZE(audit_tg_reg));
228 }
229 
230 module_init(audit_tg_init);
231 module_exit(audit_tg_exit);
232 

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