| /* |
| * ebt_log |
| * |
| * Authors: |
| * Bart De Schuymer <bdschuym@pandora.be> |
| * Harald Welte <laforge@netfilter.org> |
| * |
| * April, 2002 |
| * |
| */ |
| #include <linux/module.h> |
| #include <linux/ip.h> |
| #include <linux/in.h> |
| #include <linux/if_arp.h> |
| #include <linux/spinlock.h> |
| #include <net/netfilter/nf_log.h> |
| #include <linux/ipv6.h> |
| #include <net/ipv6.h> |
| #include <linux/in6.h> |
| #include <linux/netfilter/x_tables.h> |
| #include <linux/netfilter_bridge/ebtables.h> |
| #include <linux/netfilter_bridge/ebt_log.h> |
| #include <linux/netfilter.h> |
| |
| static DEFINE_SPINLOCK(ebt_log_lock); |
| |
| static int ebt_log_tg_check(const struct xt_tgchk_param *par) |
| { |
| struct ebt_log_info *info = par->targinfo; |
| |
| if (info->bitmask & ~EBT_LOG_MASK) |
| return -EINVAL; |
| if (info->loglevel >= 8) |
| return -EINVAL; |
| info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0'; |
| return 0; |
| } |
| |
| struct tcpudphdr |
| { |
| __be16 src; |
| __be16 dst; |
| }; |
| |
| struct arppayload |
| { |
| unsigned char mac_src[ETH_ALEN]; |
| unsigned char ip_src[4]; |
| unsigned char mac_dst[ETH_ALEN]; |
| unsigned char ip_dst[4]; |
| }; |
| |
| static void |
| print_ports(const struct sk_buff *skb, uint8_t protocol, int offset) |
| { |
| if (protocol == IPPROTO_TCP || |
| protocol == IPPROTO_UDP || |
| protocol == IPPROTO_UDPLITE || |
| protocol == IPPROTO_SCTP || |
| protocol == IPPROTO_DCCP) { |
| const struct tcpudphdr *pptr; |
| struct tcpudphdr _ports; |
| |
| pptr = skb_header_pointer(skb, offset, |
| sizeof(_ports), &_ports); |
| if (pptr == NULL) { |
| printk(" INCOMPLETE TCP/UDP header"); |
| return; |
| } |
| printk(" SPT=%u DPT=%u", ntohs(pptr->src), ntohs(pptr->dst)); |
| } |
| } |
| |
| static void |
| ebt_log_packet(u_int8_t pf, unsigned int hooknum, |
| const struct sk_buff *skb, const struct net_device *in, |
| const struct net_device *out, const struct nf_loginfo *loginfo, |
| const char *prefix) |
| { |
| unsigned int bitmask; |
| |
| spin_lock_bh(&ebt_log_lock); |
| printk("<%c>%s IN=%s OUT=%s MAC source = %pM MAC dest = %pM proto = 0x%04x", |
| '0' + loginfo->u.log.level, prefix, |
| in ? in->name : "", out ? out->name : "", |
| eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, |
| ntohs(eth_hdr(skb)->h_proto)); |
| |
| if (loginfo->type == NF_LOG_TYPE_LOG) |
| bitmask = loginfo->u.log.logflags; |
| else |
| bitmask = NF_LOG_MASK; |
| |
| if ((bitmask & EBT_LOG_IP) && eth_hdr(skb)->h_proto == |
| htons(ETH_P_IP)){ |
| const struct iphdr *ih; |
| struct iphdr _iph; |
| |
| ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph); |
| if (ih == NULL) { |
| printk(" INCOMPLETE IP header"); |
| goto out; |
| } |
| printk(" IP SRC=%pI4 IP DST=%pI4, IP tos=0x%02X, IP proto=%d", |
| &ih->saddr, &ih->daddr, ih->tos, ih->protocol); |
| print_ports(skb, ih->protocol, ih->ihl*4); |
| goto out; |
| } |
| |
| #if defined(CONFIG_BRIDGE_EBT_IP6) || defined(CONFIG_BRIDGE_EBT_IP6_MODULE) |
| if ((bitmask & EBT_LOG_IP6) && eth_hdr(skb)->h_proto == |
| htons(ETH_P_IPV6)) { |
| const struct ipv6hdr *ih; |
| struct ipv6hdr _iph; |
| uint8_t nexthdr; |
| int offset_ph; |
| |
| ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph); |
| if (ih == NULL) { |
| printk(" INCOMPLETE IPv6 header"); |
| goto out; |
| } |
| printk(" IPv6 SRC=%pI6 IPv6 DST=%pI6, IPv6 priority=0x%01X, Next Header=%d", |
| &ih->saddr, &ih->daddr, ih->priority, ih->nexthdr); |
| nexthdr = ih->nexthdr; |
| offset_ph = ipv6_skip_exthdr(skb, sizeof(_iph), &nexthdr); |
| if (offset_ph == -1) |
| goto out; |
| print_ports(skb, nexthdr, offset_ph); |
| goto out; |
| } |
| #endif |
| |
| if ((bitmask & EBT_LOG_ARP) && |
| ((eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) || |
| (eth_hdr(skb)->h_proto == htons(ETH_P_RARP)))) { |
| const struct arphdr *ah; |
| struct arphdr _arph; |
| |
| ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph); |
| if (ah == NULL) { |
| printk(" INCOMPLETE ARP header"); |
| goto out; |
| } |
| printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d", |
| ntohs(ah->ar_hrd), ntohs(ah->ar_pro), |
| ntohs(ah->ar_op)); |
| |
| /* If it's for Ethernet and the lengths are OK, |
| * then log the ARP payload */ |
| if (ah->ar_hrd == htons(1) && |
| ah->ar_hln == ETH_ALEN && |
| ah->ar_pln == sizeof(__be32)) { |
| const struct arppayload *ap; |
| struct arppayload _arpp; |
| |
| ap = skb_header_pointer(skb, sizeof(_arph), |
| sizeof(_arpp), &_arpp); |
| if (ap == NULL) { |
| printk(" INCOMPLETE ARP payload"); |
| goto out; |
| } |
| printk(" ARP MAC SRC=%pM ARP IP SRC=%pI4 ARP MAC DST=%pM ARP IP DST=%pI4", |
| ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst); |
| } |
| } |
| out: |
| printk("\n"); |
| spin_unlock_bh(&ebt_log_lock); |
| |
| } |
| |
| static unsigned int |
| ebt_log_tg(struct sk_buff *skb, const struct xt_action_param *par) |
| { |
| const struct ebt_log_info *info = par->targinfo; |
| struct nf_loginfo li; |
| |
| li.type = NF_LOG_TYPE_LOG; |
| li.u.log.level = info->loglevel; |
| li.u.log.logflags = info->bitmask; |
| |
| if (info->bitmask & EBT_LOG_NFLOG) |
| nf_log_packet(NFPROTO_BRIDGE, par->hooknum, skb, par->in, |
| par->out, &li, "%s", info->prefix); |
| else |
| ebt_log_packet(NFPROTO_BRIDGE, par->hooknum, skb, par->in, |
| par->out, &li, info->prefix); |
| return EBT_CONTINUE; |
| } |
| |
| static struct xt_target ebt_log_tg_reg __read_mostly = { |
| .name = "log", |
| .revision = 0, |
| .family = NFPROTO_BRIDGE, |
| .target = ebt_log_tg, |
| .checkentry = ebt_log_tg_check, |
| .targetsize = sizeof(struct ebt_log_info), |
| .me = THIS_MODULE, |
| }; |
| |
| static struct nf_logger ebt_log_logger __read_mostly = { |
| .name = "ebt_log", |
| .logfn = &ebt_log_packet, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init ebt_log_init(void) |
| { |
| int ret; |
| |
| ret = xt_register_target(&ebt_log_tg_reg); |
| if (ret < 0) |
| return ret; |
| nf_log_register(NFPROTO_BRIDGE, &ebt_log_logger); |
| return 0; |
| } |
| |
| static void __exit ebt_log_fini(void) |
| { |
| nf_log_unregister(&ebt_log_logger); |
| xt_unregister_target(&ebt_log_tg_reg); |
| } |
| |
| module_init(ebt_log_init); |
| module_exit(ebt_log_fini); |
| MODULE_DESCRIPTION("Ebtables: Packet logging to syslog"); |
| MODULE_LICENSE("GPL"); |