+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <net/ip.h>
#include <net/ipv6.h>
+#include <net/sctp/sctp.h>
#include <linux/sctp.h>
#include <linux/netfilter/x_tables.h>
MODULE_ALIAS("ipt_sctp");
MODULE_ALIAS("ip6t_sctp");
-#ifdef DEBUG_SCTP
-#define duprintf(format, args...) printk(format , ## args)
-#else
-#define duprintf(format, args...)
-#endif
-
#define SCCHECK(cond, option, flag, invflag) (!((flag) & (option)) \
|| (!!((invflag) & (option)) ^ (cond)))
const struct xt_sctp_flag_info *flag_info = info->flag_info;
int flag_count = info->flag_count;
-#ifdef DEBUG_SCTP
+#ifdef DEBUG
int i = 0;
#endif
do {
sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch);
if (sch == NULL || sch->length == 0) {
- duprintf("Dropping invalid SCTP packet.\n");
+ pr_debug("Dropping invalid SCTP packet.\n");
*hotdrop = true;
return false;
}
+#ifdef DEBUG
+ pr_debug("Chunk num: %d\toffset: %d\ttype: %d\tlength: %d"
+ "\tflags: %x\n",
+ ++i, offset, sch->type, htons(sch->length),
+ sch->flags);
+#endif
+ offset += WORD_ROUND(ntohs(sch->length));
- duprintf("Chunk num: %d\toffset: %d\ttype: %d\tlength: %d\tflags: %x\n",
- ++i, offset, sch->type, htons(sch->length), sch->flags);
-
- offset += (ntohs(sch->length) + 3) & ~3;
-
- duprintf("skb->len: %d\toffset: %d\n", skb->len, offset);
+ pr_debug("skb->len: %d\toffset: %d\n", skb->len, offset);
if (SCTP_CHUNKMAP_IS_SET(info->chunkmap, sch->type)) {
switch (chunk_match_type) {
}
static bool
-sctp_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+sctp_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_sctp_info *info = par->matchinfo;
const sctp_sctphdr_t *sh;
sctp_sctphdr_t _sh;
if (par->fragoff != 0) {
- duprintf("Dropping non-first fragment.. FIXME\n");
+ pr_debug("Dropping non-first fragment.. FIXME\n");
return false;
}
sh = skb_header_pointer(skb, par->thoff, sizeof(_sh), &_sh);
if (sh == NULL) {
- duprintf("Dropping evil TCP offset=0 tinygram.\n");
- *par->hotdrop = true;
+ pr_debug("Dropping evil TCP offset=0 tinygram.\n");
+ par->hotdrop = true;
return false;
}
- duprintf("spt: %d\tdpt: %d\n", ntohs(sh->source), ntohs(sh->dest));
+ pr_debug("spt: %d\tdpt: %d\n", ntohs(sh->source), ntohs(sh->dest));
return SCCHECK(ntohs(sh->source) >= info->spts[0]
&& ntohs(sh->source) <= info->spts[1],
&& ntohs(sh->dest) <= info->dpts[1],
XT_SCTP_DEST_PORTS, info->flags, info->invflags)
&& SCCHECK(match_packet(skb, par->thoff + sizeof(sctp_sctphdr_t),
- info, par->hotdrop),
+ info, &par->hotdrop),
XT_SCTP_CHUNK_TYPES, info->flags, info->invflags);
}
-static bool sctp_mt_check(const struct xt_mtchk_param *par)
+static int sctp_mt_check(const struct xt_mtchk_param *par)
{
const struct xt_sctp_info *info = par->matchinfo;
- return !(info->flags & ~XT_SCTP_VALID_FLAGS)
- && !(info->invflags & ~XT_SCTP_VALID_FLAGS)
- && !(info->invflags & ~info->flags)
- && ((!(info->flags & XT_SCTP_CHUNK_TYPES)) ||
- (info->chunk_match_type &
- (SCTP_CHUNK_MATCH_ALL
- | SCTP_CHUNK_MATCH_ANY
- | SCTP_CHUNK_MATCH_ONLY)));
+ if (info->flags & ~XT_SCTP_VALID_FLAGS)
+ return -EINVAL;
+ if (info->invflags & ~XT_SCTP_VALID_FLAGS)
+ return -EINVAL;
+ if (info->invflags & ~info->flags)
+ return -EINVAL;
+ if (!(info->flags & XT_SCTP_CHUNK_TYPES))
+ return 0;
+ if (info->chunk_match_type & (SCTP_CHUNK_MATCH_ALL |
+ SCTP_CHUNK_MATCH_ANY | SCTP_CHUNK_MATCH_ONLY))
+ return 0;
+ return -EINVAL;
}
static struct xt_match sctp_mt_reg[] __read_mostly = {