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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv6/netfilter/ip6t_rt.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/ipv6/netfilter/ip6t_rt.c')
-rw-r--r--net/ipv6/netfilter/ip6t_rt.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6t_rt.c b/net/ipv6/netfilter/ip6t_rt.c
new file mode 100644
index 00000000000..a9526b773d2
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_rt.c
@@ -0,0 +1,301 @@
+/* Kernel module to match ROUTING parameters. */
+
+/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/ipv6.h>
+
+#include <asm/byteorder.h>
+
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_rt.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("IPv6 RT match");
+MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* Returns 1 if the id is matched by the range, 0 otherwise */
+static inline int
+segsleft_match(u_int32_t min, u_int32_t max, u_int32_t id, int invert)
+{
+ int r=0;
+ DEBUGP("rt segsleft_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
+ min,id,max);
+ r=(id >= min && id <= max) ^ invert;
+ DEBUGP(" result %s\n",r? "PASS" : "FAILED");
+ return r;
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ struct ipv6_rt_hdr _route, *rh = NULL;
+ const struct ip6t_rt *rtinfo = matchinfo;
+ unsigned int temp;
+ unsigned int len;
+ u8 nexthdr;
+ unsigned int ptr;
+ unsigned int hdrlen = 0;
+ unsigned int ret = 0;
+ struct in6_addr *ap, _addr;
+
+ /* type of the 1st exthdr */
+ nexthdr = skb->nh.ipv6h->nexthdr;
+ /* pointer to the 1st exthdr */
+ ptr = sizeof(struct ipv6hdr);
+ /* available length */
+ len = skb->len - ptr;
+ temp = 0;
+
+ while (ip6t_ext_hdr(nexthdr)) {
+ struct ipv6_opt_hdr _hdr, *hp;
+
+ DEBUGP("ipv6_rt header iteration \n");
+
+ /* Is there enough space for the next ext header? */
+ if (len < (int)sizeof(struct ipv6_opt_hdr))
+ return 0;
+ /* No more exthdr -> evaluate */
+ if (nexthdr == NEXTHDR_NONE) {
+ break;
+ }
+ /* ESP -> evaluate */
+ if (nexthdr == NEXTHDR_ESP) {
+ break;
+ }
+
+ hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
+ BUG_ON(hp == NULL);
+
+ /* Calculate the header length */
+ if (nexthdr == NEXTHDR_FRAGMENT) {
+ hdrlen = 8;
+ } else if (nexthdr == NEXTHDR_AUTH)
+ hdrlen = (hp->hdrlen+2)<<2;
+ else
+ hdrlen = ipv6_optlen(hp);
+
+ /* ROUTING -> evaluate */
+ if (nexthdr == NEXTHDR_ROUTING) {
+ temp |= MASK_ROUTING;
+ break;
+ }
+
+
+ /* set the flag */
+ switch (nexthdr){
+ case NEXTHDR_HOP:
+ case NEXTHDR_ROUTING:
+ case NEXTHDR_FRAGMENT:
+ case NEXTHDR_AUTH:
+ case NEXTHDR_DEST:
+ break;
+ default:
+ DEBUGP("ipv6_rt match: unknown nextheader %u\n",nexthdr);
+ return 0;
+ break;
+ }
+
+ nexthdr = hp->nexthdr;
+ len -= hdrlen;
+ ptr += hdrlen;
+ if ( ptr > skb->len ) {
+ DEBUGP("ipv6_rt: new pointer is too large! \n");
+ break;
+ }
+ }
+
+ /* ROUTING header not found */
+ if ( temp != MASK_ROUTING ) return 0;
+
+ if (len < (int)sizeof(struct ipv6_rt_hdr)){
+ *hotdrop = 1;
+ return 0;
+ }
+
+ if (len < hdrlen){
+ /* Pcket smaller than its length field */
+ return 0;
+ }
+
+ rh = skb_header_pointer(skb, ptr, sizeof(_route), &_route);
+ BUG_ON(rh == NULL);
+
+ DEBUGP("IPv6 RT LEN %u %u ", hdrlen, rh->hdrlen);
+ DEBUGP("TYPE %04X ", rh->type);
+ DEBUGP("SGS_LEFT %u %02X\n", rh->segments_left, rh->segments_left);
+
+ DEBUGP("IPv6 RT segsleft %02X ",
+ (segsleft_match(rtinfo->segsleft[0], rtinfo->segsleft[1],
+ rh->segments_left,
+ !!(rtinfo->invflags & IP6T_RT_INV_SGS))));
+ DEBUGP("type %02X %02X %02X ",
+ rtinfo->rt_type, rh->type,
+ (!(rtinfo->flags & IP6T_RT_TYP) ||
+ ((rtinfo->rt_type == rh->type) ^
+ !!(rtinfo->invflags & IP6T_RT_INV_TYP))));
+ DEBUGP("len %02X %04X %02X ",
+ rtinfo->hdrlen, hdrlen,
+ (!(rtinfo->flags & IP6T_RT_LEN) ||
+ ((rtinfo->hdrlen == hdrlen) ^
+ !!(rtinfo->invflags & IP6T_RT_INV_LEN))));
+ DEBUGP("res %02X %02X %02X ",
+ (rtinfo->flags & IP6T_RT_RES), ((struct rt0_hdr *)rh)->bitmap,
+ !((rtinfo->flags & IP6T_RT_RES) && (((struct rt0_hdr *)rh)->bitmap)));
+
+ ret = (rh != NULL)
+ &&
+ (segsleft_match(rtinfo->segsleft[0], rtinfo->segsleft[1],
+ rh->segments_left,
+ !!(rtinfo->invflags & IP6T_RT_INV_SGS)))
+ &&
+ (!(rtinfo->flags & IP6T_RT_LEN) ||
+ ((rtinfo->hdrlen == hdrlen) ^
+ !!(rtinfo->invflags & IP6T_RT_INV_LEN)))
+ &&
+ (!(rtinfo->flags & IP6T_RT_TYP) ||
+ ((rtinfo->rt_type == rh->type) ^
+ !!(rtinfo->invflags & IP6T_RT_INV_TYP)));
+
+ if (ret && (rtinfo->flags & IP6T_RT_RES)) {
+ u_int32_t *bp, _bitmap;
+ bp = skb_header_pointer(skb,
+ ptr + offsetof(struct rt0_hdr, bitmap),
+ sizeof(_bitmap), &_bitmap);
+
+ ret = (*bp == 0);
+ }
+
+ DEBUGP("#%d ",rtinfo->addrnr);
+ if ( !(rtinfo->flags & IP6T_RT_FST) ){
+ return ret;
+ } else if (rtinfo->flags & IP6T_RT_FST_NSTRICT) {
+ DEBUGP("Not strict ");
+ if ( rtinfo->addrnr > (unsigned int)((hdrlen-8)/16) ){
+ DEBUGP("There isn't enough space\n");
+ return 0;
+ } else {
+ unsigned int i = 0;
+
+ DEBUGP("#%d ",rtinfo->addrnr);
+ for(temp=0; temp<(unsigned int)((hdrlen-8)/16); temp++){
+ ap = skb_header_pointer(skb,
+ ptr
+ + sizeof(struct rt0_hdr)
+ + temp * sizeof(_addr),
+ sizeof(_addr),
+ &_addr);
+
+ BUG_ON(ap == NULL);
+
+ if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {
+ DEBUGP("i=%d temp=%d;\n",i,temp);
+ i++;
+ }
+ if (i==rtinfo->addrnr) break;
+ }
+ DEBUGP("i=%d #%d\n", i, rtinfo->addrnr);
+ if (i == rtinfo->addrnr)
+ return ret;
+ else return 0;
+ }
+ } else {
+ DEBUGP("Strict ");
+ if ( rtinfo->addrnr > (unsigned int)((hdrlen-8)/16) ){
+ DEBUGP("There isn't enough space\n");
+ return 0;
+ } else {
+ DEBUGP("#%d ",rtinfo->addrnr);
+ for(temp=0; temp<rtinfo->addrnr; temp++){
+ ap = skb_header_pointer(skb,
+ ptr
+ + sizeof(struct rt0_hdr)
+ + temp * sizeof(_addr),
+ sizeof(_addr),
+ &_addr);
+ BUG_ON(ap == NULL);
+
+ if (!ipv6_addr_equal(ap, &rtinfo->addrs[temp]))
+ break;
+ }
+ DEBUGP("temp=%d #%d\n", temp, rtinfo->addrnr);
+ if ((temp == rtinfo->addrnr) && (temp == (unsigned int)((hdrlen-8)/16)))
+ return ret;
+ else return 0;
+ }
+ }
+
+ return 0;
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+checkentry(const char *tablename,
+ const struct ip6t_ip6 *ip,
+ void *matchinfo,
+ unsigned int matchinfosize,
+ unsigned int hook_mask)
+{
+ const struct ip6t_rt *rtinfo = matchinfo;
+
+ if (matchinfosize != IP6T_ALIGN(sizeof(struct ip6t_rt))) {
+ DEBUGP("ip6t_rt: matchsize %u != %u\n",
+ matchinfosize, IP6T_ALIGN(sizeof(struct ip6t_rt)));
+ return 0;
+ }
+ if (rtinfo->invflags & ~IP6T_RT_INV_MASK) {
+ DEBUGP("ip6t_rt: unknown flags %X\n",
+ rtinfo->invflags);
+ return 0;
+ }
+ if ( (rtinfo->flags & (IP6T_RT_RES|IP6T_RT_FST_MASK)) &&
+ (!(rtinfo->flags & IP6T_RT_TYP) ||
+ (rtinfo->rt_type != 0) ||
+ (rtinfo->invflags & IP6T_RT_INV_TYP)) ) {
+ DEBUGP("`--rt-type 0' required before `--rt-0-*'");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ip6t_match rt_match = {
+ .name = "rt",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ return ip6t_register_match(&rt_match);
+}
+
+static void __exit cleanup(void)
+{
+ ip6t_unregister_match(&rt_match);
+}
+
+module_init(init);
+module_exit(cleanup);