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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         __be16 src;
 41         __be16 dst;
 42 };
 43 
 44 struct arppayload {
 45         unsigned char mac_src[ETH_ALEN];
 46         unsigned char ip_src[4];
 47         unsigned char mac_dst[ETH_ALEN];
 48         unsigned char ip_dst[4];
 49 };
 50 
 51 static void
 52 print_ports(const struct sk_buff *skb, uint8_t protocol, int offset)
 53 {
 54         if (protocol == IPPROTO_TCP ||
 55             protocol == IPPROTO_UDP ||
 56             protocol == IPPROTO_UDPLITE ||
 57             protocol == IPPROTO_SCTP ||
 58             protocol == IPPROTO_DCCP) {
 59                 const struct tcpudphdr *pptr;
 60                 struct tcpudphdr _ports;
 61 
 62                 pptr = skb_header_pointer(skb, offset,
 63                                           sizeof(_ports), &_ports);
 64                 if (pptr == NULL) {
 65                         pr_cont(" INCOMPLETE TCP/UDP header");
 66                         return;
 67                 }
 68                 pr_cont(" SPT=%u DPT=%u", ntohs(pptr->src), ntohs(pptr->dst));
 69         }
 70 }
 71 
 72 static void
 73 ebt_log_packet(struct net *net, u_int8_t pf, unsigned int hooknum,
 74                const struct sk_buff *skb, const struct net_device *in,
 75                const struct net_device *out, const struct nf_loginfo *loginfo,
 76                const char *prefix)
 77 {
 78         unsigned int bitmask;
 79 
 80         /* FIXME: Disabled from containers until syslog ns is supported */
 81         if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
 82                 return;
 83 
 84         spin_lock_bh(&ebt_log_lock);
 85         printk(KERN_SOH "%c%s IN=%s OUT=%s MAC source = %pM MAC dest = %pM proto = 0x%04x",
 86                '' + loginfo->u.log.level, prefix,
 87                in ? in->name : "", out ? out->name : "",
 88                eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
 89                ntohs(eth_hdr(skb)->h_proto));
 90 
 91         if (loginfo->type == NF_LOG_TYPE_LOG)
 92                 bitmask = loginfo->u.log.logflags;
 93         else
 94                 bitmask = NF_LOG_DEFAULT_MASK;
 95 
 96         if ((bitmask & EBT_LOG_IP) && eth_hdr(skb)->h_proto ==
 97            htons(ETH_P_IP)) {
 98                 const struct iphdr *ih;
 99                 struct iphdr _iph;
100 
101                 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
102                 if (ih == NULL) {
103                         pr_cont(" INCOMPLETE IP header");
104                         goto out;
105                 }
106                 pr_cont(" IP SRC=%pI4 IP DST=%pI4, IP tos=0x%02X, IP proto=%d",
107                         &ih->saddr, &ih->daddr, ih->tos, ih->protocol);
108                 print_ports(skb, ih->protocol, ih->ihl*4);
109                 goto out;
110         }
111 
112 #if IS_ENABLED(CONFIG_BRIDGE_EBT_IP6)
113         if ((bitmask & EBT_LOG_IP6) && eth_hdr(skb)->h_proto ==
114            htons(ETH_P_IPV6)) {
115                 const struct ipv6hdr *ih;
116                 struct ipv6hdr _iph;
117                 uint8_t nexthdr;
118                 __be16 frag_off;
119                 int offset_ph;
120 
121                 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
122                 if (ih == NULL) {
123                         pr_cont(" INCOMPLETE IPv6 header");
124                         goto out;
125                 }
126                 pr_cont(" IPv6 SRC=%pI6 IPv6 DST=%pI6, IPv6 priority=0x%01X, Next Header=%d",
127                         &ih->saddr, &ih->daddr, ih->priority, ih->nexthdr);
128                 nexthdr = ih->nexthdr;
129                 offset_ph = ipv6_skip_exthdr(skb, sizeof(_iph), &nexthdr, &frag_off);
130                 if (offset_ph == -1)
131                         goto out;
132                 print_ports(skb, nexthdr, offset_ph);
133                 goto out;
134         }
135 #endif
136 
137         if ((bitmask & EBT_LOG_ARP) &&
138             ((eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) ||
139              (eth_hdr(skb)->h_proto == htons(ETH_P_RARP)))) {
140                 const struct arphdr *ah;
141                 struct arphdr _arph;
142 
143                 ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
144                 if (ah == NULL) {
145                         pr_cont(" INCOMPLETE ARP header");
146                         goto out;
147                 }
148                 pr_cont(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
149                         ntohs(ah->ar_hrd), ntohs(ah->ar_pro),
150                         ntohs(ah->ar_op));
151 
152                 /* If it's for Ethernet and the lengths are OK,
153                  * then log the ARP payload
154                  */
155                 if (ah->ar_hrd == htons(1) &&
156                     ah->ar_hln == ETH_ALEN &&
157                     ah->ar_pln == sizeof(__be32)) {
158                         const struct arppayload *ap;
159                         struct arppayload _arpp;
160 
161                         ap = skb_header_pointer(skb, sizeof(_arph),
162                                                 sizeof(_arpp), &_arpp);
163                         if (ap == NULL) {
164                                 pr_cont(" INCOMPLETE ARP payload");
165                                 goto out;
166                         }
167                         pr_cont(" ARP MAC SRC=%pM ARP IP SRC=%pI4 ARP MAC DST=%pM ARP IP DST=%pI4",
168                                 ap->mac_src, ap->ip_src,
169                                 ap->mac_dst, ap->ip_dst);
170                 }
171         }
172 out:
173         pr_cont("\n");
174         spin_unlock_bh(&ebt_log_lock);
175 }
176 
177 static unsigned int
178 ebt_log_tg(struct sk_buff *skb, const struct xt_action_param *par)
179 {
180         const struct ebt_log_info *info = par->targinfo;
181         struct nf_loginfo li;
182         struct net *net = xt_net(par);
183 
184         li.type = NF_LOG_TYPE_LOG;
185         li.u.log.level = info->loglevel;
186         li.u.log.logflags = info->bitmask;
187 
188         /* Remember that we have to use ebt_log_packet() not to break backward
189          * compatibility. We cannot use the default bridge packet logger via
190          * nf_log_packet() with NFT_LOG_TYPE_LOG here. --Pablo
191          */
192         if (info->bitmask & EBT_LOG_NFLOG)
193                 nf_log_packet(net, NFPROTO_BRIDGE, xt_hooknum(par), skb,
194                               xt_in(par), xt_out(par), &li, "%s",
195                               info->prefix);
196         else
197                 ebt_log_packet(net, NFPROTO_BRIDGE, xt_hooknum(par), skb,
198                                xt_in(par), xt_out(par), &li, info->prefix);
199         return EBT_CONTINUE;
200 }
201 
202 static struct xt_target ebt_log_tg_reg __read_mostly = {
203         .name           = "log",
204         .revision       = 0,
205         .family         = NFPROTO_BRIDGE,
206         .target         = ebt_log_tg,
207         .checkentry     = ebt_log_tg_check,
208         .targetsize     = sizeof(struct ebt_log_info),
209         .me             = THIS_MODULE,
210 };
211 
212 static int __init ebt_log_init(void)
213 {
214         return xt_register_target(&ebt_log_tg_reg);
215 }
216 
217 static void __exit ebt_log_fini(void)
218 {
219         xt_unregister_target(&ebt_log_tg_reg);
220 }
221 
222 module_init(ebt_log_init);
223 module_exit(ebt_log_fini);
224 MODULE_DESCRIPTION("Ebtables: Packet logging to syslog");
225 MODULE_LICENSE("GPL");
226 

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