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Linux/net/bridge/netfilter/ebt_log.c

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  1 /*
  2  *  ebt_log
  3  *
  4  *      Authors:
  5  *      Bart De Schuymer <bdschuym@pandora.be>
  6  *      Harald Welte <laforge@netfilter.org>
  7  *
  8  *  April, 2002
  9  *
 10  */
 11 #include <linux/module.h>
 12 #include <linux/ip.h>
 13 #include <linux/in.h>
 14 #include <linux/if_arp.h>
 15 #include <linux/spinlock.h>
 16 #include <net/netfilter/nf_log.h>
 17 #include <linux/ipv6.h>
 18 #include <net/ipv6.h>
 19 #include <linux/in6.h>
 20 #include <linux/netfilter/x_tables.h>
 21 #include <linux/netfilter_bridge/ebtables.h>
 22 #include <linux/netfilter_bridge/ebt_log.h>
 23 #include <linux/netfilter.h>
 24 
 25 static DEFINE_SPINLOCK(ebt_log_lock);
 26 
 27 static int ebt_log_tg_check(const struct xt_tgchk_param *par)
 28 {
 29         struct ebt_log_info *info = par->targinfo;
 30 
 31         if (info->bitmask & ~EBT_LOG_MASK)
 32                 return -EINVAL;
 33         if (info->loglevel >= 8)
 34                 return -EINVAL;
 35         info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
 36         return 0;
 37 }
 38 
 39 struct tcpudphdr
 40 {
 41         __be16 src;
 42         __be16 dst;
 43 };
 44 
 45 struct arppayload
 46 {
 47         unsigned char mac_src[ETH_ALEN];
 48         unsigned char ip_src[4];
 49         unsigned char mac_dst[ETH_ALEN];
 50         unsigned char ip_dst[4];
 51 };
 52 
 53 static void
 54 print_ports(const struct sk_buff *skb, uint8_t protocol, int offset)
 55 {
 56         if (protocol == IPPROTO_TCP ||
 57             protocol == IPPROTO_UDP ||
 58             protocol == IPPROTO_UDPLITE ||
 59             protocol == IPPROTO_SCTP ||
 60             protocol == IPPROTO_DCCP) {
 61                 const struct tcpudphdr *pptr;
 62                 struct tcpudphdr _ports;
 63 
 64                 pptr = skb_header_pointer(skb, offset,
 65                                           sizeof(_ports), &_ports);
 66                 if (pptr == NULL) {
 67                         printk(" INCOMPLETE TCP/UDP header");
 68                         return;
 69                 }
 70                 printk(" SPT=%u DPT=%u", ntohs(pptr->src), ntohs(pptr->dst));
 71         }
 72 }
 73 
 74 static void
 75 ebt_log_packet(struct net *net, u_int8_t pf, unsigned int hooknum,
 76                const struct sk_buff *skb, const struct net_device *in,
 77                const struct net_device *out, const struct nf_loginfo *loginfo,
 78                const char *prefix)
 79 {
 80         unsigned int bitmask;
 81 
 82         /* FIXME: Disabled from containers until syslog ns is supported */
 83         if (!net_eq(net, &init_net))
 84                 return;
 85 
 86         spin_lock_bh(&ebt_log_lock);
 87         printk(KERN_SOH "%c%s IN=%s OUT=%s MAC source = %pM MAC dest = %pM proto = 0x%04x",
 88                '' + loginfo->u.log.level, prefix,
 89                in ? in->name : "", out ? out->name : "",
 90                eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
 91                ntohs(eth_hdr(skb)->h_proto));
 92 
 93         if (loginfo->type == NF_LOG_TYPE_LOG)
 94                 bitmask = loginfo->u.log.logflags;
 95         else
 96                 bitmask = NF_LOG_MASK;
 97 
 98         if ((bitmask & EBT_LOG_IP) && eth_hdr(skb)->h_proto ==
 99            htons(ETH_P_IP)){
100                 const struct iphdr *ih;
101                 struct iphdr _iph;
102 
103                 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
104                 if (ih == NULL) {
105                         printk(" INCOMPLETE IP header");
106                         goto out;
107                 }
108                 printk(" IP SRC=%pI4 IP DST=%pI4, IP tos=0x%02X, IP proto=%d",
109                        &ih->saddr, &ih->daddr, ih->tos, ih->protocol);
110                 print_ports(skb, ih->protocol, ih->ihl*4);
111                 goto out;
112         }
113 
114 #if IS_ENABLED(CONFIG_BRIDGE_EBT_IP6)
115         if ((bitmask & EBT_LOG_IP6) && eth_hdr(skb)->h_proto ==
116            htons(ETH_P_IPV6)) {
117                 const struct ipv6hdr *ih;
118                 struct ipv6hdr _iph;
119                 uint8_t nexthdr;
120                 __be16 frag_off;
121                 int offset_ph;
122 
123                 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
124                 if (ih == NULL) {
125                         printk(" INCOMPLETE IPv6 header");
126                         goto out;
127                 }
128                 printk(" IPv6 SRC=%pI6 IPv6 DST=%pI6, IPv6 priority=0x%01X, Next Header=%d",
129                        &ih->saddr, &ih->daddr, ih->priority, ih->nexthdr);
130                 nexthdr = ih->nexthdr;
131                 offset_ph = ipv6_skip_exthdr(skb, sizeof(_iph), &nexthdr, &frag_off);
132                 if (offset_ph == -1)
133                         goto out;
134                 print_ports(skb, nexthdr, offset_ph);
135                 goto out;
136         }
137 #endif
138 
139         if ((bitmask & EBT_LOG_ARP) &&
140             ((eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) ||
141              (eth_hdr(skb)->h_proto == htons(ETH_P_RARP)))) {
142                 const struct arphdr *ah;
143                 struct arphdr _arph;
144 
145                 ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
146                 if (ah == NULL) {
147                         printk(" INCOMPLETE ARP header");
148                         goto out;
149                 }
150                 printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
151                        ntohs(ah->ar_hrd), ntohs(ah->ar_pro),
152                        ntohs(ah->ar_op));
153 
154                 /* If it's for Ethernet and the lengths are OK,
155                  * then log the ARP payload */
156                 if (ah->ar_hrd == htons(1) &&
157                     ah->ar_hln == ETH_ALEN &&
158                     ah->ar_pln == sizeof(__be32)) {
159                         const struct arppayload *ap;
160                         struct arppayload _arpp;
161 
162                         ap = skb_header_pointer(skb, sizeof(_arph),
163                                                 sizeof(_arpp), &_arpp);
164                         if (ap == NULL) {
165                                 printk(" INCOMPLETE ARP payload");
166                                 goto out;
167                         }
168                         printk(" ARP MAC SRC=%pM ARP IP SRC=%pI4 ARP MAC DST=%pM ARP IP DST=%pI4",
169                                         ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst);
170                 }
171         }
172 out:
173         printk("\n");
174         spin_unlock_bh(&ebt_log_lock);
175 
176 }
177 
178 static unsigned int
179 ebt_log_tg(struct sk_buff *skb, const struct xt_action_param *par)
180 {
181         const struct ebt_log_info *info = par->targinfo;
182         struct nf_loginfo li;
183         struct net *net = dev_net(par->in ? par->in : par->out);
184 
185         li.type = NF_LOG_TYPE_LOG;
186         li.u.log.level = info->loglevel;
187         li.u.log.logflags = info->bitmask;
188 
189         if (info->bitmask & EBT_LOG_NFLOG)
190                 nf_log_packet(net, NFPROTO_BRIDGE, par->hooknum, skb,
191                               par->in, par->out, &li, "%s", info->prefix);
192         else
193                 ebt_log_packet(net, NFPROTO_BRIDGE, par->hooknum, skb, par->in,
194                                par->out, &li, info->prefix);
195         return EBT_CONTINUE;
196 }
197 
198 static struct xt_target ebt_log_tg_reg __read_mostly = {
199         .name           = "log",
200         .revision       = 0,
201         .family         = NFPROTO_BRIDGE,
202         .target         = ebt_log_tg,
203         .checkentry     = ebt_log_tg_check,
204         .targetsize     = sizeof(struct ebt_log_info),
205         .me             = THIS_MODULE,
206 };
207 
208 static struct nf_logger ebt_log_logger __read_mostly = {
209         .name           = "ebt_log",
210         .logfn          = &ebt_log_packet,
211         .me             = THIS_MODULE,
212 };
213 
214 static int __net_init ebt_log_net_init(struct net *net)
215 {
216         nf_log_set(net, NFPROTO_BRIDGE, &ebt_log_logger);
217         return 0;
218 }
219 
220 static void __net_exit ebt_log_net_fini(struct net *net)
221 {
222         nf_log_unset(net, &ebt_log_logger);
223 }
224 
225 static struct pernet_operations ebt_log_net_ops = {
226         .init = ebt_log_net_init,
227         .exit = ebt_log_net_fini,
228 };
229 
230 static int __init ebt_log_init(void)
231 {
232         int ret;
233 
234         ret = register_pernet_subsys(&ebt_log_net_ops);
235         if (ret < 0)
236                 goto err_pernet;
237 
238         ret = xt_register_target(&ebt_log_tg_reg);
239         if (ret < 0)
240                 goto err_target;
241 
242         nf_log_register(NFPROTO_BRIDGE, &ebt_log_logger);
243 
244         return ret;
245 
246 err_target:
247         unregister_pernet_subsys(&ebt_log_net_ops);
248 err_pernet:
249         return ret;
250 }
251 
252 static void __exit ebt_log_fini(void)
253 {
254         unregister_pernet_subsys(&ebt_log_net_ops);
255         nf_log_unregister(&ebt_log_logger);
256         xt_unregister_target(&ebt_log_tg_reg);
257 }
258 
259 module_init(ebt_log_init);
260 module_exit(ebt_log_fini);
261 MODULE_DESCRIPTION("Ebtables: Packet logging to syslog");
262 MODULE_LICENSE("GPL");
263 

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