* 2 of the License, or (at your option) any later version.
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/icmpv6.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#include <net/flow.h>
+#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_REJECT.h>
MODULE_DESCRIPTION("IP6 tables REJECT target module");
MODULE_LICENSE("GPL");
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
/* Send RST reply */
static void send_reset(struct sk_buff *oldskb)
{
struct tcphdr otcph, *tcph;
unsigned int otcplen, hh_len;
int tcphoff, needs_ack;
- struct ipv6hdr *oip6h = oldskb->nh.ipv6h, *ip6h;
+ struct ipv6hdr *oip6h = ipv6_hdr(oldskb), *ip6h;
struct dst_entry *dst = NULL;
u8 proto;
struct flowi fl;
if ((!(ipv6_addr_type(&oip6h->saddr) & IPV6_ADDR_UNICAST)) ||
(!(ipv6_addr_type(&oip6h->daddr) & IPV6_ADDR_UNICAST))) {
- DEBUGP("ip6t_REJECT: addr is not unicast.\n");
+ pr_debug("ip6t_REJECT: addr is not unicast.\n");
return;
}
tcphoff = ipv6_skip_exthdr(oldskb, ((u8*)(oip6h+1) - oldskb->data), &proto);
if ((tcphoff < 0) || (tcphoff > oldskb->len)) {
- DEBUGP("ip6t_REJECT: Can't get TCP header.\n");
+ pr_debug("ip6t_REJECT: Can't get TCP header.\n");
return;
}
otcplen = oldskb->len - tcphoff;
/* IP header checks: fragment, too short. */
- if ((proto != IPPROTO_TCP) || (otcplen < sizeof(struct tcphdr))) {
- DEBUGP("ip6t_REJECT: proto(%d) != IPPROTO_TCP, or too short. otcplen = %d\n",
- proto, otcplen);
+ if (proto != IPPROTO_TCP || otcplen < sizeof(struct tcphdr)) {
+ pr_debug("ip6t_REJECT: proto(%d) != IPPROTO_TCP, "
+ "or too short. otcplen = %d\n",
+ proto, otcplen);
return;
}
/* No RST for RST. */
if (otcph.rst) {
- DEBUGP("ip6t_REJECT: RST is set\n");
+ pr_debug("ip6t_REJECT: RST is set\n");
return;
}
/* Check checksum. */
if (csum_ipv6_magic(&oip6h->saddr, &oip6h->daddr, otcplen, IPPROTO_TCP,
skb_checksum(oldskb, tcphoff, otcplen, 0))) {
- DEBUGP("ip6t_REJECT: TCP checksum is invalid\n");
+ pr_debug("ip6t_REJECT: TCP checksum is invalid\n");
return;
}
ipv6_addr_copy(&fl.fl6_dst, &oip6h->saddr);
fl.fl_ip_sport = otcph.dest;
fl.fl_ip_dport = otcph.source;
+ security_skb_classify_flow(oldskb, &fl);
dst = ip6_route_output(NULL, &fl);
if (dst == NULL)
return;
- if (dst->error ||
- xfrm_lookup(&dst, &fl, NULL, 0)) {
- dst_release(dst);
+ if (dst->error || xfrm_lookup(&dst, &fl, NULL, 0))
return;
- }
hh_len = (dst->dev->hard_header_len + 15)&~15;
nskb = alloc_skb(hh_len + 15 + dst->header_len + sizeof(struct ipv6hdr)
skb_reserve(nskb, hh_len + dst->header_len);
- ip6h = nskb->nh.ipv6h = (struct ipv6hdr *)
- skb_put(nskb, sizeof(struct ipv6hdr));
+ skb_put(nskb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(nskb);
+ ip6h = ipv6_hdr(nskb);
ip6h->version = 6;
ip6h->hop_limit = dst_metric(dst, RTAX_HOPLIMIT);
ip6h->nexthdr = IPPROTO_TCP;
- ip6h->payload_len = htons(sizeof(struct tcphdr));
ipv6_addr_copy(&ip6h->saddr, &oip6h->daddr);
ipv6_addr_copy(&ip6h->daddr, &oip6h->saddr);
tcph->check = 0;
/* Adjust TCP checksum */
- tcph->check = csum_ipv6_magic(&nskb->nh.ipv6h->saddr,
- &nskb->nh.ipv6h->daddr,
+ tcph->check = csum_ipv6_magic(&ipv6_hdr(nskb)->saddr,
+ &ipv6_hdr(nskb)->daddr,
sizeof(struct tcphdr), IPPROTO_TCP,
- csum_partial((char *)tcph,
+ csum_partial(tcph,
sizeof(struct tcphdr), 0));
- NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
- dst_output);
+ nf_ct_attach(nskb, oldskb);
+
+ ip6_local_out(nskb);
}
static inline void
send_unreach(struct sk_buff *skb_in, unsigned char code, unsigned int hooknum)
{
- if (hooknum == NF_IP6_LOCAL_OUT && skb_in->dev == NULL)
- skb_in->dev = &loopback_dev;
+ if (hooknum == NF_INET_LOCAL_OUT && skb_in->dev == NULL)
+ skb_in->dev = init_net.loopback_dev;
icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0, NULL);
}
-static unsigned int reject6_target(struct sk_buff **pskb,
+static unsigned int reject6_target(struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
unsigned int hooknum,
- const void *targinfo,
- void *userinfo)
+ const struct xt_target *target,
+ const void *targinfo)
{
const struct ip6t_reject_info *reject = targinfo;
- DEBUGP(KERN_DEBUG "%s: medium point\n", __FUNCTION__);
+ pr_debug("%s: medium point\n", __FUNCTION__);
/* WARNING: This code causes reentry within ip6tables.
This means that the ip6tables jump stack is now crap. We
must return an absolute verdict. --RR */
- switch (reject->with) {
- case IP6T_ICMP6_NO_ROUTE:
- send_unreach(*pskb, ICMPV6_NOROUTE, hooknum);
- break;
- case IP6T_ICMP6_ADM_PROHIBITED:
- send_unreach(*pskb, ICMPV6_ADM_PROHIBITED, hooknum);
- break;
- case IP6T_ICMP6_NOT_NEIGHBOUR:
- send_unreach(*pskb, ICMPV6_NOT_NEIGHBOUR, hooknum);
- break;
- case IP6T_ICMP6_ADDR_UNREACH:
- send_unreach(*pskb, ICMPV6_ADDR_UNREACH, hooknum);
- break;
- case IP6T_ICMP6_PORT_UNREACH:
- send_unreach(*pskb, ICMPV6_PORT_UNREACH, hooknum);
- break;
- case IP6T_ICMP6_ECHOREPLY:
+ switch (reject->with) {
+ case IP6T_ICMP6_NO_ROUTE:
+ send_unreach(skb, ICMPV6_NOROUTE, hooknum);
+ break;
+ case IP6T_ICMP6_ADM_PROHIBITED:
+ send_unreach(skb, ICMPV6_ADM_PROHIBITED, hooknum);
+ break;
+ case IP6T_ICMP6_NOT_NEIGHBOUR:
+ send_unreach(skb, ICMPV6_NOT_NEIGHBOUR, hooknum);
+ break;
+ case IP6T_ICMP6_ADDR_UNREACH:
+ send_unreach(skb, ICMPV6_ADDR_UNREACH, hooknum);
+ break;
+ case IP6T_ICMP6_PORT_UNREACH:
+ send_unreach(skb, ICMPV6_PORT_UNREACH, hooknum);
+ break;
+ case IP6T_ICMP6_ECHOREPLY:
/* Do nothing */
break;
case IP6T_TCP_RESET:
- send_reset(*pskb);
+ send_reset(skb);
break;
default:
if (net_ratelimit())
return NF_DROP;
}
-static int check(const char *tablename,
- const struct ip6t_entry *e,
- void *targinfo,
- unsigned int targinfosize,
- unsigned int hook_mask)
+static bool check(const char *tablename,
+ const void *entry,
+ const struct xt_target *target,
+ void *targinfo,
+ unsigned int hook_mask)
{
- const struct ip6t_reject_info *rejinfo = targinfo;
-
- if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_reject_info))) {
- DEBUGP("ip6t_REJECT: targinfosize %u != 0\n", targinfosize);
- return 0;
- }
-
- /* Only allow these for packet filtering. */
- if (strcmp(tablename, "filter") != 0) {
- DEBUGP("ip6t_REJECT: bad table `%s'.\n", tablename);
- return 0;
- }
-
- if ((hook_mask & ~((1 << NF_IP6_LOCAL_IN)
- | (1 << NF_IP6_FORWARD)
- | (1 << NF_IP6_LOCAL_OUT))) != 0) {
- DEBUGP("ip6t_REJECT: bad hook mask %X\n", hook_mask);
- return 0;
- }
+ const struct ip6t_reject_info *rejinfo = targinfo;
+ const struct ip6t_entry *e = entry;
if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) {
printk("ip6t_REJECT: ECHOREPLY is not supported.\n");
- return 0;
+ return false;
} else if (rejinfo->with == IP6T_TCP_RESET) {
/* Must specify that it's a TCP packet */
if (e->ipv6.proto != IPPROTO_TCP
- || (e->ipv6.invflags & IP6T_INV_PROTO)) {
- DEBUGP("ip6t_REJECT: TCP_RESET illegal for non-tcp\n");
- return 0;
+ || (e->ipv6.invflags & XT_INV_PROTO)) {
+ printk("ip6t_REJECT: TCP_RESET illegal for non-tcp\n");
+ return false;
}
}
-
- return 1;
+ return true;
}
-static struct ip6t_target ip6t_reject_reg = {
+static struct xt_target ip6t_reject_reg __read_mostly = {
.name = "REJECT",
+ .family = AF_INET6,
.target = reject6_target,
+ .targetsize = sizeof(struct ip6t_reject_info),
+ .table = "filter",
+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
+ (1 << NF_INET_LOCAL_OUT),
.checkentry = check,
.me = THIS_MODULE
};
-static int __init init(void)
+static int __init ip6t_reject_init(void)
{
- if (ip6t_register_target(&ip6t_reject_reg))
- return -EINVAL;
- return 0;
+ return xt_register_target(&ip6t_reject_reg);
}
-static void __exit fini(void)
+static void __exit ip6t_reject_fini(void)
{
- ip6t_unregister_target(&ip6t_reject_reg);
+ xt_unregister_target(&ip6t_reject_reg);
}
-module_init(init);
-module_exit(fini);
+module_init(ip6t_reject_init);
+module_exit(ip6t_reject_fini);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff