#include <asm/byteorder.h>
+#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_opts.h>
MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
MODULE_ALIAS("ip6t_dst");
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
/*
* (Type & 0xC0) >> 6
* 0 -> ignorable
* 5 -> RTALERT 2 x x
*/
-static int
-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)
+static bool
+hbh_mt6(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,
+ bool *hotdrop)
{
- struct ipv6_opt_hdr _optsh, *oh;
+ struct ipv6_opt_hdr _optsh;
+ const struct ipv6_opt_hdr *oh;
const struct ip6t_opts *optinfo = matchinfo;
unsigned int temp;
unsigned int ptr;
unsigned int hdrlen = 0;
- unsigned int ret = 0;
- u8 _opttype, *tp = NULL;
- u8 _optlen, *lp = NULL;
+ bool ret = false;
+ u8 _opttype;
+ u8 _optlen;
+ const u_int8_t *tp = NULL;
+ const u_int8_t *lp = NULL;
unsigned int optlen;
int err;
err = ipv6_find_hdr(skb, &ptr, match->data, NULL);
if (err < 0) {
if (err != -ENOENT)
- *hotdrop = 1;
- return 0;
+ *hotdrop = true;
+ return false;
}
oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh);
if (oh == NULL) {
- *hotdrop = 1;
- return 0;
+ *hotdrop = true;
+ return false;
}
hdrlen = ipv6_optlen(oh);
if (skb->len - ptr < hdrlen) {
/* Packet smaller than it's length field */
- return 0;
+ return false;
}
- DEBUGP("IPv6 OPTS LEN %u %u ", hdrlen, oh->hdrlen);
+ pr_debug("IPv6 OPTS LEN %u %u ", hdrlen, oh->hdrlen);
- DEBUGP("len %02X %04X %02X ",
- optinfo->hdrlen, hdrlen,
- (!(optinfo->flags & IP6T_OPTS_LEN) ||
- ((optinfo->hdrlen == hdrlen) ^
- !!(optinfo->invflags & IP6T_OPTS_INV_LEN))));
+ pr_debug("len %02X %04X %02X ",
+ optinfo->hdrlen, hdrlen,
+ (!(optinfo->flags & IP6T_OPTS_LEN) ||
+ ((optinfo->hdrlen == hdrlen) ^
+ !!(optinfo->invflags & IP6T_OPTS_INV_LEN))));
ret = (oh != NULL) &&
(!(optinfo->flags & IP6T_OPTS_LEN) ||
if (!(optinfo->flags & IP6T_OPTS_OPTS)) {
return ret;
} else if (optinfo->flags & IP6T_OPTS_NSTRICT) {
- DEBUGP("Not strict - not implemented");
+ pr_debug("Not strict - not implemented");
} else {
- DEBUGP("Strict ");
- DEBUGP("#%d ", optinfo->optsnr);
+ pr_debug("Strict ");
+ pr_debug("#%d ", optinfo->optsnr);
for (temp = 0; temp < optinfo->optsnr; temp++) {
/* type field exists ? */
if (hdrlen < 1)
/* Type check */
if (*tp != (optinfo->opts[temp] & 0xFF00) >> 8) {
- DEBUGP("Tbad %02X %02X\n",
- *tp,
- (optinfo->opts[temp] & 0xFF00) >> 8);
- return 0;
+ pr_debug("Tbad %02X %02X\n", *tp,
+ (optinfo->opts[temp] & 0xFF00) >> 8);
+ return false;
} else {
- DEBUGP("Tok ");
+ pr_debug("Tok ");
}
/* Length check */
if (*tp) {
spec_len = optinfo->opts[temp] & 0x00FF;
if (spec_len != 0x00FF && spec_len != *lp) {
- DEBUGP("Lbad %02X %04X\n", *lp,
- spec_len);
- return 0;
+ pr_debug("Lbad %02X %04X\n", *lp,
+ spec_len);
+ return false;
}
- DEBUGP("Lok ");
+ pr_debug("Lok ");
optlen = *lp + 2;
} else {
- DEBUGP("Pad1\n");
+ pr_debug("Pad1\n");
optlen = 1;
}
/* Step to the next */
- DEBUGP("len%04X \n", optlen);
+ pr_debug("len%04X \n", optlen);
if ((ptr > skb->len - optlen || hdrlen < optlen) &&
- (temp < optinfo->optsnr - 1)) {
- DEBUGP("new pointer is too large! \n");
+ temp < optinfo->optsnr - 1) {
+ pr_debug("new pointer is too large! \n");
break;
}
ptr += optlen;
if (temp == optinfo->optsnr)
return ret;
else
- return 0;
+ return false;
}
- return 0;
+ return false;
}
/* Called when user tries to insert an entry of this type. */
-static int
-checkentry(const char *tablename,
- const void *entry,
- const struct xt_match *match,
- void *matchinfo,
- unsigned int hook_mask)
+static bool
+hbh_mt6_check(const char *tablename, const void *entry,
+ const struct xt_match *match, void *matchinfo,
+ unsigned int hook_mask)
{
const struct ip6t_opts *optsinfo = matchinfo;
if (optsinfo->invflags & ~IP6T_OPTS_INV_MASK) {
- DEBUGP("ip6t_opts: unknown flags %X\n", optsinfo->invflags);
- return 0;
+ pr_debug("ip6t_opts: unknown flags %X\n", optsinfo->invflags);
+ return false;
}
- return 1;
+ return true;
}
-static struct xt_match opts_match[] = {
+static struct xt_match hbh_mt6_reg[] __read_mostly = {
{
.name = "hbh",
.family = AF_INET6,
- .match = match,
+ .match = hbh_mt6,
.matchsize = sizeof(struct ip6t_opts),
- .checkentry = checkentry,
+ .checkentry = hbh_mt6_check,
.me = THIS_MODULE,
.data = NEXTHDR_HOP,
},
{
.name = "dst",
.family = AF_INET6,
- .match = match,
+ .match = hbh_mt6,
.matchsize = sizeof(struct ip6t_opts),
- .checkentry = checkentry,
+ .checkentry = hbh_mt6_check,
.me = THIS_MODULE,
.data = NEXTHDR_DEST,
},
};
-static int __init ip6t_hbh_init(void)
+static int __init hbh_mt6_init(void)
{
- return xt_register_matches(opts_match, ARRAY_SIZE(opts_match));
+ return xt_register_matches(hbh_mt6_reg, ARRAY_SIZE(hbh_mt6_reg));
}
-static void __exit ip6t_hbh_fini(void)
+static void __exit hbh_mt6_exit(void)
{
- xt_unregister_matches(opts_match, ARRAY_SIZE(opts_match));
+ xt_unregister_matches(hbh_mt6_reg, ARRAY_SIZE(hbh_mt6_reg));
}
-module_init(ip6t_hbh_init);
-module_exit(ip6t_hbh_fini);
+module_init(hbh_mt6_init);
+module_exit(hbh_mt6_exit);
projects / mirror_ubuntu-bionic-kernel.git / blobdiff