*/
#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/skbuff.h>
+#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/spinlock.h>
#include <linux/icmpv6.h>
MODULE_DESCRIPTION("IP6 tables LOG target module");
MODULE_LICENSE("GPL");
-static unsigned int nflog = 1;
-MODULE_PARM(nflog, "i");
-MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
-
struct in_device;
#include <net/route.h>
#include <linux/netfilter_ipv6/ip6t_LOG.h>
#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;
-
-/* takes in current header and pointer to the header */
-/* if another header exists, sets hdrptr to the next header
- and returns the new header value, else returns IPPROTO_NONE */
-static u_int8_t ip6_nexthdr(u_int8_t currenthdr, u_int8_t **hdrptr)
-{
- u_int8_t hdrlen, nexthdr = IPPROTO_NONE;
-
- switch(currenthdr){
- case IPPROTO_AH:
- /* whoever decided to do the length of AUTH for ipv6
- in 32bit units unlike other headers should be beaten...
- repeatedly...with a large stick...no, an even LARGER
- stick...no, you're still not thinking big enough */
- nexthdr = **hdrptr;
- hdrlen = *hdrptr[1] * 4 + 8;
- *hdrptr = *hdrptr + hdrlen;
- break;
- /*stupid rfc2402 */
- case IPPROTO_DSTOPTS:
- case IPPROTO_ROUTING:
- case IPPROTO_HOPOPTS:
- nexthdr = **hdrptr;
- hdrlen = *hdrptr[1] * 8 + 8;
- *hdrptr = *hdrptr + hdrlen;
- break;
- case IPPROTO_FRAGMENT:
- nexthdr = **hdrptr;
- *hdrptr = *hdrptr + 8;
- break;
- }
- return nexthdr;
-}
+static DEFINE_SPINLOCK(log_lock);
/* One level of recursion won't kill us */
-static void dump_packet(const struct ip6t_log_info *info,
- struct ipv6hdr *ipv6h, int recurse)
+static void dump_packet(const struct nf_loginfo *info,
+ const struct sk_buff *skb, unsigned int ip6hoff,
+ int recurse)
{
- u_int8_t currenthdr = ipv6h->nexthdr;
- u_int8_t *hdrptr;
+ u_int8_t currenthdr;
int fragment;
+ struct ipv6hdr _ip6h, *ih;
+ unsigned int ptr;
+ unsigned int hdrlen = 0;
+ unsigned int logflags;
+
+ if (info->type == NF_LOG_TYPE_LOG)
+ logflags = info->u.log.logflags;
+ else
+ logflags = NF_LOG_MASK;
+
+ ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
+ if (ih == NULL) {
+ printk("TRUNCATED");
+ return;
+ }
- /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000" */
- printk("SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ipv6h->saddr));
- printk("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ipv6h->daddr));
+ /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
+ printk("SRC=" NIP6_FMT " DST=" NIP6_FMT " ", NIP6(ih->saddr), NIP6(ih->daddr));
/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
- ntohs(ipv6h->payload_len) + sizeof(struct ipv6hdr),
- (ntohl(*(u_int32_t *)ipv6h) & 0x0ff00000) >> 20,
- ipv6h->hop_limit,
- (ntohl(*(u_int32_t *)ipv6h) & 0x000fffff));
+ ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
+ (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
+ ih->hop_limit,
+ (ntohl(*(__be32 *)ih) & 0x000fffff));
fragment = 0;
- hdrptr = (u_int8_t *)(ipv6h + 1);
- while (currenthdr != IPPROTO_NONE) {
- if ((currenthdr == IPPROTO_TCP) ||
- (currenthdr == IPPROTO_UDP) ||
- (currenthdr == IPPROTO_ICMPV6))
- break;
+ ptr = ip6hoff + sizeof(struct ipv6hdr);
+ currenthdr = ih->nexthdr;
+ while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
+ struct ipv6_opt_hdr _hdr, *hp;
+
+ hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
+ if (hp == NULL) {
+ printk("TRUNCATED");
+ return;
+ }
+
/* Max length: 48 "OPT (...) " */
- printk("OPT ( ");
+ if (logflags & IP6T_LOG_IPOPT)
+ printk("OPT ( ");
+
switch (currenthdr) {
case IPPROTO_FRAGMENT: {
- struct frag_hdr *fhdr = (struct frag_hdr *)hdrptr;
+ struct frag_hdr _fhdr, *fh;
+
+ printk("FRAG:");
+ fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
+ &_fhdr);
+ if (fh == NULL) {
+ printk("TRUNCATED ");
+ return;
+ }
- /* Max length: 11 "FRAG:65535 " */
- printk("FRAG:%u ", ntohs(fhdr->frag_off) & 0xFFF8);
+ /* Max length: 6 "65535 " */
+ printk("%u ", ntohs(fh->frag_off) & 0xFFF8);
/* Max length: 11 "INCOMPLETE " */
- if (fhdr->frag_off & htons(0x0001))
+ if (fh->frag_off & htons(0x0001))
printk("INCOMPLETE ");
- printk("ID:%08x ", fhdr->identification);
+ printk("ID:%08x ", ntohl(fh->identification));
- if (ntohs(fhdr->frag_off) & 0xFFF8)
+ if (ntohs(fh->frag_off) & 0xFFF8)
fragment = 1;
+ hdrlen = 8;
+
break;
}
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
case IPPROTO_HOPOPTS:
+ if (fragment) {
+ if (logflags & IP6T_LOG_IPOPT)
+ printk(")");
+ return;
+ }
+ hdrlen = ipv6_optlen(hp);
break;
/* Max Length */
case IPPROTO_AH:
+ if (logflags & IP6T_LOG_IPOPT) {
+ struct ip_auth_hdr _ahdr, *ah;
+
+ /* Max length: 3 "AH " */
+ printk("AH ");
+
+ if (fragment) {
+ printk(")");
+ return;
+ }
+
+ ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
+ &_ahdr);
+ if (ah == NULL) {
+ /*
+ * Max length: 26 "INCOMPLETE [65535
+ * bytes] )"
+ */
+ printk("INCOMPLETE [%u bytes] )",
+ skb->len - ptr);
+ return;
+ }
+
+ /* Length: 15 "SPI=0xF1234567 */
+ printk("SPI=0x%x ", ntohl(ah->spi));
+
+ }
+
+ hdrlen = (hp->hdrlen+2)<<2;
+ break;
case IPPROTO_ESP:
- if (info->logflags & IP6T_LOG_IPOPT) {
- struct esphdr *esph = (struct esphdr *)hdrptr;
- int esp = (currenthdr == IPPROTO_ESP);
+ if (logflags & IP6T_LOG_IPOPT) {
+ struct ip_esp_hdr _esph, *eh;
/* Max length: 4 "ESP " */
- printk("%s ",esp ? "ESP" : "AH");
+ printk("ESP ");
+
+ if (fragment) {
+ printk(")");
+ return;
+ }
+
+ /*
+ * Max length: 26 "INCOMPLETE [65535 bytes] )"
+ */
+ eh = skb_header_pointer(skb, ptr, sizeof(_esph),
+ &_esph);
+ if (eh == NULL) {
+ printk("INCOMPLETE [%u bytes] )",
+ skb->len - ptr);
+ return;
+ }
+
+ /* Length: 16 "SPI=0xF1234567 )" */
+ printk("SPI=0x%x )", ntohl(eh->spi) );
- /* Length: 15 "SPI=0xF1234567 " */
- printk("SPI=0x%x ", ntohl(esph->spi) );
- break;
}
+ return;
default:
- break;
+ /* Max length: 20 "Unknown Ext Hdr 255" */
+ printk("Unknown Ext Hdr %u", currenthdr);
+ return;
}
- printk(") ");
- currenthdr = ip6_nexthdr(currenthdr, &hdrptr);
+ if (logflags & IP6T_LOG_IPOPT)
+ printk(") ");
+
+ currenthdr = hp->nexthdr;
+ ptr += hdrlen;
}
switch (currenthdr) {
case IPPROTO_TCP: {
- struct tcphdr *tcph = (struct tcphdr *)hdrptr;
+ struct tcphdr _tcph, *th;
/* Max length: 10 "PROTO=TCP " */
printk("PROTO=TCP ");
if (fragment)
break;
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);
+ if (th == NULL) {
+ printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
+ return;
+ }
+
/* Max length: 20 "SPT=65535 DPT=65535 " */
printk("SPT=%u DPT=%u ",
- ntohs(tcph->source), ntohs(tcph->dest));
+ ntohs(th->source), ntohs(th->dest));
/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
- if (info->logflags & IP6T_LOG_TCPSEQ)
+ if (logflags & IP6T_LOG_TCPSEQ)
printk("SEQ=%u ACK=%u ",
- ntohl(tcph->seq), ntohl(tcph->ack_seq));
+ ntohl(th->seq), ntohl(th->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));
+ printk("WINDOW=%u ", ntohs(th->window));
+ /* Max length: 9 "RES=0x3C " */
+ printk("RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
- if (tcph->cwr)
+ if (th->cwr)
printk("CWR ");
- if (tcph->ece)
+ if (th->ece)
printk("ECE ");
- if (tcph->urg)
+ if (th->urg)
printk("URG ");
- if (tcph->ack)
+ if (th->ack)
printk("ACK ");
- if (tcph->psh)
+ if (th->psh)
printk("PSH ");
- if (tcph->rst)
+ if (th->rst)
printk("RST ");
- if (tcph->syn)
+ if (th->syn)
printk("SYN ");
- if (tcph->fin)
+ if (th->fin)
printk("FIN ");
/* Max length: 11 "URGP=65535 " */
- printk("URGP=%u ", ntohs(tcph->urg_ptr));
+ printk("URGP=%u ", ntohs(th->urg_ptr));
- if ((info->logflags & IP6T_LOG_TCPOPT)
- && tcph->doff * 4 != sizeof(struct tcphdr)) {
+ if ((logflags & IP6T_LOG_TCPOPT)
+ && th->doff * 4 > sizeof(struct tcphdr)) {
+ u_int8_t _opt[60 - sizeof(struct tcphdr)], *op;
unsigned int i;
+ unsigned int optsize = th->doff * 4
+ - sizeof(struct tcphdr);
+
+ op = skb_header_pointer(skb,
+ ptr + sizeof(struct tcphdr),
+ optsize, _opt);
+ if (op == NULL) {
+ printk("OPT (TRUNCATED)");
+ return;
+ }
/* 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]);
+ for (i =0; i < optsize; i++)
+ printk("%02X", op[i]);
printk(") ");
}
break;
}
- case IPPROTO_UDP: {
- struct udphdr *udph = (struct udphdr *)hdrptr;
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE: {
+ struct udphdr _udph, *uh;
- /* Max length: 10 "PROTO=UDP " */
- printk("PROTO=UDP ");
+ if (currenthdr == IPPROTO_UDP)
+ /* Max length: 10 "PROTO=UDP " */
+ printk("PROTO=UDP " );
+ else /* Max length: 14 "PROTO=UDPLITE " */
+ printk("PROTO=UDPLITE ");
if (fragment)
break;
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
+ if (uh == NULL) {
+ printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
+ return;
+ }
+
/* Max length: 20 "SPT=65535 DPT=65535 " */
printk("SPT=%u DPT=%u LEN=%u ",
- ntohs(udph->source), ntohs(udph->dest),
- ntohs(udph->len));
+ ntohs(uh->source), ntohs(uh->dest),
+ ntohs(uh->len));
break;
}
case IPPROTO_ICMPV6: {
- struct icmp6hdr *icmp6h = (struct icmp6hdr *)hdrptr;
+ struct icmp6hdr _icmp6h, *ic;
/* Max length: 13 "PROTO=ICMPv6 " */
printk("PROTO=ICMPv6 ");
if (fragment)
break;
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
+ if (ic == NULL) {
+ printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
+ return;
+ }
+
/* Max length: 18 "TYPE=255 CODE=255 " */
- printk("TYPE=%u CODE=%u ", icmp6h->icmp6_type, icmp6h->icmp6_code);
+ printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
- switch (icmp6h->icmp6_type) {
+ switch (ic->icmp6_type) {
case ICMPV6_ECHO_REQUEST:
case ICMPV6_ECHO_REPLY:
/* Max length: 19 "ID=65535 SEQ=65535 " */
printk("ID=%u SEQ=%u ",
- ntohs(icmp6h->icmp6_identifier),
- ntohs(icmp6h->icmp6_sequence));
+ ntohs(ic->icmp6_identifier),
+ ntohs(ic->icmp6_sequence));
break;
case ICMPV6_MGM_QUERY:
case ICMPV6_MGM_REPORT:
case ICMPV6_PARAMPROB:
/* Max length: 17 "POINTER=ffffffff " */
- printk("POINTER=%08x ", ntohl(icmp6h->icmp6_pointer));
+ printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));
/* Fall through */
case ICMPV6_DEST_UNREACH:
case ICMPV6_PKT_TOOBIG:
/* Max length: 3+maxlen */
if (recurse) {
printk("[");
- dump_packet(info, (struct ipv6hdr *)(icmp6h + 1), 0);
+ dump_packet(info, skb, ptr + sizeof(_icmp6h),
+ 0);
printk("] ");
}
/* Max length: 10 "MTU=65535 " */
- if (icmp6h->icmp6_type == ICMPV6_PKT_TOOBIG)
- printk("MTU=%u ", ntohl(icmp6h->icmp6_mtu));
+ if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
+ printk("MTU=%u ", ntohl(ic->icmp6_mtu));
}
break;
}
default:
printk("PROTO=%u ", currenthdr);
}
+
+ /* Max length: 15 "UID=4294967295 " */
+ if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
+ read_lock_bh(&skb->sk->sk_callback_lock);
+ if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+ printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
+ read_unlock_bh(&skb->sk->sk_callback_lock);
+ }
}
+static struct nf_loginfo default_loginfo = {
+ .type = NF_LOG_TYPE_LOG,
+ .u = {
+ .log = {
+ .level = 0,
+ .logflags = NF_LOG_MASK,
+ },
+ },
+};
+
static void
-ip6t_log_packet(unsigned int hooknum,
+ip6t_log_packet(unsigned int pf,
+ unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
- const struct ip6t_log_info *loginfo,
- const char *level_string,
+ const struct nf_loginfo *loginfo,
const char *prefix)
{
- struct ipv6hdr *ipv6h = skb->nh.ipv6h;
+ if (!loginfo)
+ loginfo = &default_loginfo;
spin_lock_bh(&log_lock);
- printk(level_string);
- printk("%sIN=%s OUT=%s ",
- prefix == NULL ? loginfo->prefix : prefix,
+ printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
+ prefix,
in ? in->name : "",
out ? out->name : "");
if (in && !out) {
+ unsigned int len;
/* MAC logging for input chain only. */
printk("MAC=");
- if (skb->dev && skb->dev->hard_header_len && skb->mac.raw != (void*)ipv6h) {
- if (skb->dev->type != ARPHRD_SIT){
- int i;
- unsigned char *p = skb->mac.raw;
- for (i = 0; i < skb->dev->hard_header_len; i++,p++)
- printk("%02x%c", *p,
- i==skb->dev->hard_header_len - 1
- ? ' ':':');
- } else {
- int i;
- unsigned char *p = skb->mac.raw;
- if ( p - (ETH_ALEN*2+2) > skb->head ){
- p -= (ETH_ALEN+2);
- for (i = 0; i < (ETH_ALEN); i++,p++)
- printk("%02x%s", *p,
- i == ETH_ALEN-1 ? "->" : ":");
- p -= (ETH_ALEN*2);
- for (i = 0; i < (ETH_ALEN); i++,p++)
- printk("%02x%c", *p,
- i == ETH_ALEN-1 ? ' ' : ':');
- }
-
- if ((skb->dev->addr_len == 4) &&
- skb->dev->hard_header_len > 20){
- printk("TUNNEL=");
- p = skb->mac.raw + 12;
- for (i = 0; i < 4; i++,p++)
- printk("%3d%s", *p,
- i == 3 ? "->" : ".");
- for (i = 0; i < 4; i++,p++)
- printk("%3d%c", *p,
- i == 3 ? ' ' : '.');
- }
+ if (skb->dev && (len = skb->dev->hard_header_len) &&
+ skb->mac.raw != skb->nh.raw) {
+ unsigned char *p = skb->mac.raw;
+ int i;
+
+ if (skb->dev->type == ARPHRD_SIT &&
+ (p -= ETH_HLEN) < skb->head)
+ p = NULL;
+
+ if (p != NULL) {
+ for (i = 0; i < len; i++)
+ printk("%02x%s", p[i],
+ i == len - 1 ? "" : ":");
+ }
+ printk(" ");
+
+ if (skb->dev->type == ARPHRD_SIT) {
+ struct iphdr *iph = (struct iphdr *)skb->mac.raw;
+ printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ",
+ NIPQUAD(iph->saddr),
+ NIPQUAD(iph->daddr));
}
} else
printk(" ");
}
- dump_packet(loginfo, ipv6h, 1);
+ dump_packet(loginfo, skb, (u8*)skb->nh.ipv6h - skb->data, 1);
printk("\n");
spin_unlock_bh(&log_lock);
}
static unsigned int
ip6t_log_target(struct sk_buff **pskb,
- unsigned int hooknum,
const struct net_device *in,
const struct net_device *out,
- const void *targinfo,
- void *userinfo)
+ unsigned int hooknum,
+ const struct xt_target *target,
+ const void *targinfo)
{
const struct ip6t_log_info *loginfo = targinfo;
- char level_string[4] = "< >";
+ struct nf_loginfo li;
- level_string[1] = '0' + (loginfo->level % 8);
- ip6t_log_packet(hooknum, *pskb, in, out, loginfo, level_string, NULL);
+ li.type = NF_LOG_TYPE_LOG;
+ li.u.log.level = loginfo->level;
+ li.u.log.logflags = loginfo->logflags;
+ ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
+ loginfo->prefix);
return IP6T_CONTINUE;
}
-static void
-ip6t_logfn(unsigned int hooknum,
- const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const char *prefix)
-{
- struct ip6t_log_info loginfo = {
- .level = 0,
- .logflags = IP6T_LOG_MASK,
- .prefix = ""
- };
-
- ip6t_log_packet(hooknum, skb, in, out, &loginfo, KERN_WARNING, prefix);
-}
static int ip6t_log_checkentry(const char *tablename,
- const struct ip6t_entry *e,
+ const void *entry,
+ const struct xt_target *target,
void *targinfo,
- unsigned int targinfosize,
unsigned int hook_mask)
{
const struct ip6t_log_info *loginfo = targinfo;
- if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_log_info))) {
- DEBUGP("LOG: targinfosize %u != %u\n",
- targinfosize, IP6T_ALIGN(sizeof(struct ip6t_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 ip6t_target ip6t_log_reg = {
.name = "LOG",
.target = ip6t_log_target,
+ .targetsize = sizeof(struct ip6t_log_info),
.checkentry = ip6t_log_checkentry,
.me = THIS_MODULE,
};
-static int __init init(void)
+static struct nf_logger ip6t_logger = {
+ .name = "ip6t_LOG",
+ .logfn = &ip6t_log_packet,
+ .me = THIS_MODULE,
+};
+
+static int __init ip6t_log_init(void)
{
if (ip6t_register_target(&ip6t_log_reg))
return -EINVAL;
- if (nflog)
- nf_log_register(PF_INET6, &ip6t_logfn);
+ if (nf_log_register(PF_INET6, &ip6t_logger) < 0) {
+ printk(KERN_WARNING "ip6t_LOG: not logging via system console "
+ "since somebody else already registered for PF_INET6\n");
+ /* we cannot make module load fail here, since otherwise
+ * ip6tables userspace would abort */
+ }
return 0;
}
-static void __exit fini(void)
+static void __exit ip6t_log_fini(void)
{
- if (nflog)
- nf_log_unregister(PF_INET6, &ip6t_logfn);
+ nf_log_unregister_logger(&ip6t_logger);
ip6t_unregister_target(&ip6t_log_reg);
}
-module_init(init);
-module_exit(fini);
+module_init(ip6t_log_init);
+module_exit(ip6t_log_fini);
git://git.onelab.eu / linux-2.6.git / blobdiff