#include <net/checksum.h>
#include <net/ipv6.h>
+#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_frag.h>
#endif
/* Returns 1 if the id is matched by the range, 0 otherwise */
-static inline int
-id_match(u_int32_t min, u_int32_t max, u_int32_t id, int invert)
+static inline bool
+id_match(u_int32_t min, u_int32_t max, u_int32_t id, bool invert)
{
- int r = 0;
+ bool r;
DEBUGP("frag id_match:%c 0x%x <= 0x%x <= 0x%x", invert ? '!' : ' ',
min, id, max);
r = (id >= min && id <= max) ^ invert;
return r;
}
-static int
+static bool
match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
+ const struct xt_match *match,
const void *matchinfo,
int offset,
unsigned int protoff,
- int *hotdrop)
+ bool *hotdrop)
{
- struct frag_hdr _frag, *fh;
+ struct frag_hdr _frag;
+ const struct frag_hdr *fh;
const struct ip6t_frag *fraginfo = matchinfo;
unsigned int ptr;
+ int err;
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_FRAGMENT, NULL) < 0)
- return 0;
+ err = ipv6_find_hdr(skb, &ptr, NEXTHDR_FRAGMENT, NULL);
+ if (err < 0) {
+ if (err != -ENOENT)
+ *hotdrop = true;
+ return false;
+ }
fh = skb_header_pointer(skb, ptr, sizeof(_frag), &_frag);
if (fh == NULL) {
- *hotdrop = 1;
- return 0;
+ *hotdrop = true;
+ return false;
}
DEBUGP("INFO %04X ", fh->frag_off);
ntohl(fh->identification));
DEBUGP("IPv6 FRAG id %02X ",
- (id_match(fraginfo->ids[0], fraginfo->ids[1],
+ id_match(fraginfo->ids[0], fraginfo->ids[1],
ntohl(fh->identification),
- !!(fraginfo->invflags & IP6T_FRAG_INV_IDS))));
+ !!(fraginfo->invflags & IP6T_FRAG_INV_IDS)));
DEBUGP("res %02X %02X%04X %02X ",
- (fraginfo->flags & IP6T_FRAG_RES), fh->reserved,
+ fraginfo->flags & IP6T_FRAG_RES, fh->reserved,
ntohs(fh->frag_off) & 0x6,
!((fraginfo->flags & IP6T_FRAG_RES)
&& (fh->reserved || (ntohs(fh->frag_off) & 0x06))));
DEBUGP("first %02X %02X %02X ",
- (fraginfo->flags & IP6T_FRAG_FST),
+ fraginfo->flags & IP6T_FRAG_FST,
ntohs(fh->frag_off) & ~0x7,
!((fraginfo->flags & IP6T_FRAG_FST)
&& (ntohs(fh->frag_off) & ~0x7)));
DEBUGP("mf %02X %02X %02X ",
- (fraginfo->flags & IP6T_FRAG_MF),
+ fraginfo->flags & IP6T_FRAG_MF,
ntohs(fh->frag_off) & IP6_MF,
!((fraginfo->flags & IP6T_FRAG_MF)
&& !((ntohs(fh->frag_off) & IP6_MF))));
DEBUGP("last %02X %02X %02X\n",
- (fraginfo->flags & IP6T_FRAG_NMF),
+ fraginfo->flags & IP6T_FRAG_NMF,
ntohs(fh->frag_off) & IP6_MF,
!((fraginfo->flags & IP6T_FRAG_NMF)
&& (ntohs(fh->frag_off) & IP6_MF)));
return (fh != NULL)
&&
- (id_match(fraginfo->ids[0], fraginfo->ids[1],
- ntohl(fh->identification),
- !!(fraginfo->invflags & IP6T_FRAG_INV_IDS)))
+ id_match(fraginfo->ids[0], fraginfo->ids[1],
+ ntohl(fh->identification),
+ !!(fraginfo->invflags & IP6T_FRAG_INV_IDS))
&&
!((fraginfo->flags & IP6T_FRAG_RES)
&& (fh->reserved || (ntohs(fh->frag_off) & 0x6)))
}
/* Called when user tries to insert an entry of this type. */
-static int
+static bool
checkentry(const char *tablename,
const void *ip,
+ const struct xt_match *match,
void *matchinfo,
- unsigned int matchinfosize,
unsigned int hook_mask)
{
const struct ip6t_frag *fraginfo = matchinfo;
if (fraginfo->invflags & ~IP6T_FRAG_INV_MASK) {
DEBUGP("ip6t_frag: unknown flags %X\n", fraginfo->invflags);
- return 0;
+ return false;
}
- return 1;
+ return true;
}
-static struct ip6t_match frag_match = {
+static struct xt_match frag_match __read_mostly = {
.name = "frag",
+ .family = AF_INET6,
.match = match,
.matchsize = sizeof(struct ip6t_frag),
.checkentry = checkentry,
.me = THIS_MODULE,
};
-static int __init init(void)
+static int __init ip6t_frag_init(void)
{
- return ip6t_register_match(&frag_match);
+ return xt_register_match(&frag_match);
}
-static void __exit cleanup(void)
+static void __exit ip6t_frag_fini(void)
{
- ip6t_unregister_match(&frag_match);
+ xt_unregister_match(&frag_match);
}
-module_init(init);
-module_exit(cleanup);
+module_init(ip6t_frag_init);
+module_exit(ip6t_frag_fini);