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![Andrew Morton](/assets/img/avatar_default.png)
Every netfilter module uses `init' for its module_init() function and `fini' or `cleanup' for its module_exit() function. Problem is, this creates uninformative initcall_debug output and makes ctags rather useless. So go through and rename them all to $(filename)_init and $(filename)_fini. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
239 lines
5.9 KiB
C
239 lines
5.9 KiB
C
/* Kernel module to match ROUTING parameters. */
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/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ipv6.h>
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#include <linux/types.h>
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#include <net/checksum.h>
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#include <net/ipv6.h>
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#include <asm/byteorder.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter_ipv6/ip6t_rt.h>
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("IPv6 RT match");
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MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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/* Returns 1 if the id is matched by the range, 0 otherwise */
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static inline int
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segsleft_match(u_int32_t min, u_int32_t max, u_int32_t id, int invert)
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{
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int r = 0;
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DEBUGP("rt segsleft_match:%c 0x%x <= 0x%x <= 0x%x",
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invert ? '!' : ' ', min, id, max);
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r = (id >= min && id <= max) ^ invert;
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DEBUGP(" result %s\n", r ? "PASS" : "FAILED");
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return r;
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}
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct xt_match *match,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop)
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{
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struct ipv6_rt_hdr _route, *rh;
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const struct ip6t_rt *rtinfo = matchinfo;
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unsigned int temp;
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unsigned int ptr;
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unsigned int hdrlen = 0;
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unsigned int ret = 0;
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struct in6_addr *ap, _addr;
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if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ROUTING, NULL) < 0)
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return 0;
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rh = skb_header_pointer(skb, ptr, sizeof(_route), &_route);
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if (rh == NULL) {
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*hotdrop = 1;
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return 0;
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}
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hdrlen = ipv6_optlen(rh);
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if (skb->len - ptr < hdrlen) {
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/* Pcket smaller than its length field */
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return 0;
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}
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DEBUGP("IPv6 RT LEN %u %u ", hdrlen, rh->hdrlen);
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DEBUGP("TYPE %04X ", rh->type);
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DEBUGP("SGS_LEFT %u %02X\n", rh->segments_left, rh->segments_left);
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DEBUGP("IPv6 RT segsleft %02X ",
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(segsleft_match(rtinfo->segsleft[0], rtinfo->segsleft[1],
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rh->segments_left,
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!!(rtinfo->invflags & IP6T_RT_INV_SGS))));
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DEBUGP("type %02X %02X %02X ",
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rtinfo->rt_type, rh->type,
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(!(rtinfo->flags & IP6T_RT_TYP) ||
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((rtinfo->rt_type == rh->type) ^
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!!(rtinfo->invflags & IP6T_RT_INV_TYP))));
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DEBUGP("len %02X %04X %02X ",
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rtinfo->hdrlen, hdrlen,
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(!(rtinfo->flags & IP6T_RT_LEN) ||
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((rtinfo->hdrlen == hdrlen) ^
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!!(rtinfo->invflags & IP6T_RT_INV_LEN))));
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DEBUGP("res %02X %02X %02X ",
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(rtinfo->flags & IP6T_RT_RES),
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((struct rt0_hdr *)rh)->reserved,
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!((rtinfo->flags & IP6T_RT_RES) &&
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(((struct rt0_hdr *)rh)->reserved)));
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ret = (rh != NULL)
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&&
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(segsleft_match(rtinfo->segsleft[0], rtinfo->segsleft[1],
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rh->segments_left,
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!!(rtinfo->invflags & IP6T_RT_INV_SGS)))
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&&
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(!(rtinfo->flags & IP6T_RT_LEN) ||
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((rtinfo->hdrlen == hdrlen) ^
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!!(rtinfo->invflags & IP6T_RT_INV_LEN)))
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&&
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(!(rtinfo->flags & IP6T_RT_TYP) ||
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((rtinfo->rt_type == rh->type) ^
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!!(rtinfo->invflags & IP6T_RT_INV_TYP)));
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if (ret && (rtinfo->flags & IP6T_RT_RES)) {
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u_int32_t *rp, _reserved;
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rp = skb_header_pointer(skb,
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ptr + offsetof(struct rt0_hdr,
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reserved),
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sizeof(_reserved),
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&_reserved);
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ret = (*rp == 0);
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}
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DEBUGP("#%d ", rtinfo->addrnr);
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if (!(rtinfo->flags & IP6T_RT_FST)) {
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return ret;
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} else if (rtinfo->flags & IP6T_RT_FST_NSTRICT) {
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DEBUGP("Not strict ");
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if (rtinfo->addrnr > (unsigned int)((hdrlen - 8) / 16)) {
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DEBUGP("There isn't enough space\n");
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return 0;
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} else {
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unsigned int i = 0;
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DEBUGP("#%d ", rtinfo->addrnr);
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for (temp = 0;
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temp < (unsigned int)((hdrlen - 8) / 16);
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temp++) {
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ap = skb_header_pointer(skb,
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ptr
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+ sizeof(struct rt0_hdr)
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+ temp * sizeof(_addr),
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sizeof(_addr),
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&_addr);
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BUG_ON(ap == NULL);
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if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {
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DEBUGP("i=%d temp=%d;\n", i, temp);
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i++;
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}
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if (i == rtinfo->addrnr)
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break;
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}
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DEBUGP("i=%d #%d\n", i, rtinfo->addrnr);
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if (i == rtinfo->addrnr)
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return ret;
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else
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return 0;
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}
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} else {
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DEBUGP("Strict ");
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if (rtinfo->addrnr > (unsigned int)((hdrlen - 8) / 16)) {
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DEBUGP("There isn't enough space\n");
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return 0;
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} else {
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DEBUGP("#%d ", rtinfo->addrnr);
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for (temp = 0; temp < rtinfo->addrnr; temp++) {
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ap = skb_header_pointer(skb,
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ptr
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+ sizeof(struct rt0_hdr)
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+ temp * sizeof(_addr),
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sizeof(_addr),
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&_addr);
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BUG_ON(ap == NULL);
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if (!ipv6_addr_equal(ap, &rtinfo->addrs[temp]))
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break;
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}
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DEBUGP("temp=%d #%d\n", temp, rtinfo->addrnr);
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if ((temp == rtinfo->addrnr) &&
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(temp == (unsigned int)((hdrlen - 8) / 16)))
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return ret;
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else
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return 0;
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}
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}
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return 0;
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}
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/* Called when user tries to insert an entry of this type. */
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static int
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checkentry(const char *tablename,
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const void *entry,
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const struct xt_match *match,
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void *matchinfo,
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unsigned int matchinfosize,
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unsigned int hook_mask)
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{
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const struct ip6t_rt *rtinfo = matchinfo;
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if (rtinfo->invflags & ~IP6T_RT_INV_MASK) {
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DEBUGP("ip6t_rt: unknown flags %X\n", rtinfo->invflags);
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return 0;
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}
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if ((rtinfo->flags & (IP6T_RT_RES | IP6T_RT_FST_MASK)) &&
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(!(rtinfo->flags & IP6T_RT_TYP) ||
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(rtinfo->rt_type != 0) ||
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(rtinfo->invflags & IP6T_RT_INV_TYP))) {
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DEBUGP("`--rt-type 0' required before `--rt-0-*'");
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return 0;
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}
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return 1;
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}
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static struct ip6t_match rt_match = {
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.name = "rt",
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.match = match,
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.matchsize = sizeof(struct ip6t_rt),
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.checkentry = checkentry,
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.me = THIS_MODULE,
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};
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static int __init ip6t_rt_init(void)
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{
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return ip6t_register_match(&rt_match);
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}
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static void __exit ip6t_rt_fini(void)
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{
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ip6t_unregister_match(&rt_match);
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}
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module_init(ip6t_rt_init);
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module_exit(ip6t_rt_fini);
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