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Diffstat (limited to 'br-nf-bds/linux/net/ipv4/netfilter/ipt_LOG.c')
-rw-r--r--br-nf-bds/linux/net/ipv4/netfilter/ipt_LOG.c363
1 files changed, 363 insertions, 0 deletions
diff --git a/br-nf-bds/linux/net/ipv4/netfilter/ipt_LOG.c b/br-nf-bds/linux/net/ipv4/netfilter/ipt_LOG.c
new file mode 100644
index 0000000..48bb12f
--- /dev/null
+++ b/br-nf-bds/linux/net/ipv4/netfilter/ipt_LOG.c
@@ -0,0 +1,363 @@
+/*
+ * This is a module which is used for logging packets.
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/spinlock.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+struct in_device;
+#include <net/route.h>
+#include <linux/netfilter_ipv4/ipt_LOG.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+struct esphdr {
+ __u32 spi;
+}; /* FIXME evil kludge */
+
+/* Use lock to serialize, so printks don't overlap */
+static spinlock_t log_lock = SPIN_LOCK_UNLOCKED;
+
+/* One level of recursion won't kill us */
+static void dump_packet(const struct ipt_log_info *info,
+ struct iphdr *iph, unsigned int len, int recurse)
+{
+ void *protoh = (u_int32_t *)iph + iph->ihl;
+ unsigned int datalen = len - iph->ihl * 4;
+
+ /* Important fields:
+ * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
+ /* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
+ printk("SRC=%u.%u.%u.%u DST=%u.%u.%u.%u ",
+ NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
+
+ /* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
+ printk("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
+ ntohs(iph->tot_len), iph->tos & IPTOS_TOS_MASK,
+ iph->tos & IPTOS_PREC_MASK, iph->ttl, ntohs(iph->id));
+
+ /* Max length: 6 "CE DF MF " */
+ if (ntohs(iph->frag_off) & IP_CE)
+ printk("CE ");
+ if (ntohs(iph->frag_off) & IP_DF)
+ printk("DF ");
+ if (ntohs(iph->frag_off) & IP_MF)
+ printk("MF ");
+
+ /* Max length: 11 "FRAG:65535 " */
+ if (ntohs(iph->frag_off) & IP_OFFSET)
+ printk("FRAG:%u ", ntohs(iph->frag_off) & IP_OFFSET);
+
+ if ((info->logflags & IPT_LOG_IPOPT)
+ && iph->ihl * 4 != sizeof(struct iphdr)) {
+ unsigned int i;
+
+ /* Max length: 127 "OPT (" 15*4*2chars ") " */
+ printk("OPT (");
+ for (i = sizeof(struct iphdr); i < iph->ihl * 4; i++)
+ printk("%02X", ((u_int8_t *)iph)[i]);
+ printk(") ");
+ }
+
+ switch (iph->protocol) {
+ case IPPROTO_TCP: {
+ struct tcphdr *tcph = protoh;
+
+ /* Max length: 10 "PROTO=TCP " */
+ printk("PROTO=TCP ");
+
+ if (ntohs(iph->frag_off) & IP_OFFSET)
+ break;
+
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ if (datalen < sizeof (*tcph)) {
+ printk("INCOMPLETE [%u bytes] ", datalen);
+ break;
+ }
+
+ /* Max length: 20 "SPT=65535 DPT=65535 " */
+ printk("SPT=%u DPT=%u ",
+ ntohs(tcph->source), ntohs(tcph->dest));
+ /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
+ if (info->logflags & IPT_LOG_TCPSEQ)
+ printk("SEQ=%u ACK=%u ",
+ ntohl(tcph->seq), ntohl(tcph->ack_seq));
+ /* Max length: 13 "WINDOW=65535 " */
+ printk("WINDOW=%u ", ntohs(tcph->window));
+ /* Max length: 9 "RES=0x3F " */
+ printk("RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(tcph) & TCP_RESERVED_BITS) >> 22));
+ /* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
+ if (tcph->cwr)
+ printk("CWR ");
+ if (tcph->ece)
+ printk("ECE ");
+ if (tcph->urg)
+ printk("URG ");
+ if (tcph->ack)
+ printk("ACK ");
+ if (tcph->psh)
+ printk("PSH ");
+ if (tcph->rst)
+ printk("RST ");
+ if (tcph->syn)
+ printk("SYN ");
+ if (tcph->fin)
+ printk("FIN ");
+ /* Max length: 11 "URGP=65535 " */
+ printk("URGP=%u ", ntohs(tcph->urg_ptr));
+
+ if ((info->logflags & IPT_LOG_TCPOPT)
+ && tcph->doff * 4 != sizeof(struct tcphdr)) {
+ unsigned int i;
+
+ /* Max length: 127 "OPT (" 15*4*2chars ") " */
+ printk("OPT (");
+ for (i =sizeof(struct tcphdr); i < tcph->doff * 4; i++)
+ printk("%02X", ((u_int8_t *)tcph)[i]);
+ printk(") ");
+ }
+ break;
+ }
+ case IPPROTO_UDP: {
+ struct udphdr *udph = protoh;
+
+ /* Max length: 10 "PROTO=UDP " */
+ printk("PROTO=UDP ");
+
+ if (ntohs(iph->frag_off) & IP_OFFSET)
+ break;
+
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ if (datalen < sizeof (*udph)) {
+ printk("INCOMPLETE [%u bytes] ", datalen);
+ break;
+ }
+
+ /* Max length: 20 "SPT=65535 DPT=65535 " */
+ printk("SPT=%u DPT=%u LEN=%u ",
+ ntohs(udph->source), ntohs(udph->dest),
+ ntohs(udph->len));
+ break;
+ }
+ case IPPROTO_ICMP: {
+ struct icmphdr *icmph = protoh;
+ static size_t required_len[NR_ICMP_TYPES+1]
+ = { [ICMP_ECHOREPLY] = 4,
+ [ICMP_DEST_UNREACH]
+ = 8 + sizeof(struct iphdr) + 8,
+ [ICMP_SOURCE_QUENCH]
+ = 8 + sizeof(struct iphdr) + 8,
+ [ICMP_REDIRECT]
+ = 8 + sizeof(struct iphdr) + 8,
+ [ICMP_ECHO] = 4,
+ [ICMP_TIME_EXCEEDED]
+ = 8 + sizeof(struct iphdr) + 8,
+ [ICMP_PARAMETERPROB]
+ = 8 + sizeof(struct iphdr) + 8,
+ [ICMP_TIMESTAMP] = 20,
+ [ICMP_TIMESTAMPREPLY] = 20,
+ [ICMP_ADDRESS] = 12,
+ [ICMP_ADDRESSREPLY] = 12 };
+
+ /* Max length: 11 "PROTO=ICMP " */
+ printk("PROTO=ICMP ");
+
+ if (ntohs(iph->frag_off) & IP_OFFSET)
+ break;
+
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ if (datalen < 4) {
+ printk("INCOMPLETE [%u bytes] ", datalen);
+ break;
+ }
+
+ /* Max length: 18 "TYPE=255 CODE=255 " */
+ printk("TYPE=%u CODE=%u ", icmph->type, icmph->code);
+
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ if (icmph->type <= NR_ICMP_TYPES
+ && required_len[icmph->type]
+ && datalen < required_len[icmph->type]) {
+ printk("INCOMPLETE [%u bytes] ", datalen);
+ break;
+ }
+
+ switch (icmph->type) {
+ case ICMP_ECHOREPLY:
+ case ICMP_ECHO:
+ /* Max length: 19 "ID=65535 SEQ=65535 " */
+ printk("ID=%u SEQ=%u ",
+ ntohs(icmph->un.echo.id),
+ ntohs(icmph->un.echo.sequence));
+ break;
+
+ case ICMP_PARAMETERPROB:
+ /* Max length: 14 "PARAMETER=255 " */
+ printk("PARAMETER=%u ",
+ ntohl(icmph->un.gateway) >> 24);
+ break;
+ case ICMP_REDIRECT:
+ /* Max length: 24 "GATEWAY=255.255.255.255 " */
+ printk("GATEWAY=%u.%u.%u.%u ", NIPQUAD(icmph->un.gateway));
+ /* Fall through */
+ case ICMP_DEST_UNREACH:
+ case ICMP_SOURCE_QUENCH:
+ case ICMP_TIME_EXCEEDED:
+ /* Max length: 3+maxlen */
+ if (recurse) {
+ printk("[");
+ dump_packet(info,
+ (struct iphdr *)(icmph + 1),
+ datalen-sizeof(struct icmphdr),
+ 0);
+ printk("] ");
+ }
+
+ /* Max length: 10 "MTU=65535 " */
+ if (icmph->type == ICMP_DEST_UNREACH
+ && icmph->code == ICMP_FRAG_NEEDED)
+ printk("MTU=%u ", ntohs(icmph->un.frag.mtu));
+ }
+ break;
+ }
+ /* Max Length */
+ case IPPROTO_AH:
+ case IPPROTO_ESP: {
+ struct esphdr *esph = protoh;
+ int esp= (iph->protocol==IPPROTO_ESP);
+
+ /* Max length: 10 "PROTO=ESP " */
+ printk("PROTO=%s ",esp? "ESP" : "AH");
+
+ if (ntohs(iph->frag_off) & IP_OFFSET)
+ break;
+
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ if (datalen < sizeof (*esph)) {
+ printk("INCOMPLETE [%u bytes] ", datalen);
+ break;
+ }
+
+ /* Length: 15 "SPI=0xF1234567 " */
+ printk("SPI=0x%x ", ntohl(esph->spi) );
+ break;
+ }
+ /* Max length: 10 "PROTO 255 " */
+ default:
+ printk("PROTO=%u ", iph->protocol);
+ }
+
+ /* Proto Max log string length */
+ /* IP: 40+46+6+11+127 = 230 */
+ /* TCP: 10+max(25,20+30+13+9+32+11+127) = 252 */
+ /* UDP: 10+max(25,20) = 35 */
+ /* ICMP: 11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
+ /* ESP: 10+max(25)+15 = 50 */
+ /* AH: 9+max(25)+15 = 49 */
+ /* unknown: 10 */
+
+ /* (ICMP allows recursion one level deep) */
+ /* maxlen = IP + ICMP + IP + max(TCP,UDP,ICMP,unknown) */
+ /* maxlen = 230+ 91 + 230 + 252 = 803 */
+}
+
+static unsigned int
+ipt_log_target(struct sk_buff **pskb,
+ unsigned int hooknum,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *targinfo,
+ void *userinfo)
+{
+ struct iphdr *iph = (*pskb)->nh.iph;
+ const struct ipt_log_info *loginfo = targinfo;
+ char level_string[4] = "< >";
+
+ level_string[1] = '0' + (loginfo->level % 8);
+ spin_lock_bh(&log_lock);
+ printk(level_string);
+ printk("%sIN=%s ", loginfo->prefix, in ? in->name : "");
+ if ((*pskb)->physindev && in != (*pskb)->physindev)
+ printk("PHYSIN=%s ", (*pskb)->physindev->name);
+ printk("OUT=%s ", out ? out->name : "");
+ if ((*pskb)->physoutdev && out != (*pskb)->physoutdev)
+ printk("PHYSOUT=%s ", (*pskb)->physoutdev->name);
+
+ if (in && !out) {
+ /* MAC logging for input chain only. */
+ printk("MAC=");
+ if ((*pskb)->dev && (*pskb)->dev->hard_header_len && (*pskb)->mac.raw != (void*)iph) {
+ int i;
+ unsigned char *p = (*pskb)->mac.raw;
+ for (i = 0; i < (*pskb)->dev->hard_header_len; i++,p++)
+ printk("%02x%c", *p,
+ i==(*pskb)->dev->hard_header_len - 1
+ ? ' ':':');
+ } else
+ printk(" ");
+ }
+
+ dump_packet(loginfo, iph, (*pskb)->len, 1);
+ printk("\n");
+ spin_unlock_bh(&log_lock);
+
+ return IPT_CONTINUE;
+}
+
+static int ipt_log_checkentry(const char *tablename,
+ const struct ipt_entry *e,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ const struct ipt_log_info *loginfo = targinfo;
+
+ if (targinfosize != IPT_ALIGN(sizeof(struct ipt_log_info))) {
+ DEBUGP("LOG: targinfosize %u != %u\n",
+ targinfosize, IPT_ALIGN(sizeof(struct ipt_log_info)));
+ return 0;
+ }
+
+ if (loginfo->level >= 8) {
+ DEBUGP("LOG: level %u >= 8\n", loginfo->level);
+ return 0;
+ }
+
+ if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
+ DEBUGP("LOG: prefix term %i\n",
+ loginfo->prefix[sizeof(loginfo->prefix)-1]);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ipt_target ipt_log_reg
+= { { NULL, NULL }, "LOG", ipt_log_target, ipt_log_checkentry, NULL,
+ THIS_MODULE };
+
+static int __init init(void)
+{
+ if (ipt_register_target(&ipt_log_reg))
+ return -EINVAL;
+
+ return 0;
+}
+
+static void __exit fini(void)
+{
+ ipt_unregister_target(&ipt_log_reg);
+}
+
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");