* published by the Free Software Foundation.
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#define DEBUGP(format, args...)
#endif
-static inline struct rtable *route_reverse(struct sk_buff *skb,
- struct tcphdr *tcph, int hook)
-{
- struct iphdr *iph = skb->nh.iph;
- struct dst_entry *odst;
- struct flowi fl = {};
- struct rtable *rt;
-
- /* We don't require ip forwarding to be enabled to be able to
- * send a RST reply for bridged traffic. */
- if (hook != NF_IP_FORWARD
-#ifdef CONFIG_BRIDGE_NETFILTER
- || (skb->nf_bridge && skb->nf_bridge->mask & BRNF_BRIDGED)
-#endif
- ) {
- fl.nl_u.ip4_u.daddr = iph->saddr;
- if (hook == NF_IP_LOCAL_IN)
- fl.nl_u.ip4_u.saddr = iph->daddr;
- fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
-
- if (ip_route_output_key(&rt, &fl) != 0)
- return NULL;
- } else {
- /* non-local src, find valid iif to satisfy
- * rp-filter when calling ip_route_input. */
- fl.nl_u.ip4_u.daddr = iph->daddr;
- if (ip_route_output_key(&rt, &fl) != 0)
- return NULL;
-
- odst = skb->dst;
- if (ip_route_input(skb, iph->saddr, iph->daddr,
- RT_TOS(iph->tos), rt->u.dst.dev) != 0) {
- dst_release(&rt->u.dst);
- return NULL;
- }
- dst_release(&rt->u.dst);
- rt = (struct rtable *)skb->dst;
- skb->dst = odst;
-
- fl.nl_u.ip4_u.daddr = iph->saddr;
- fl.nl_u.ip4_u.saddr = iph->daddr;
- fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
- }
-
- if (rt->u.dst.error) {
- dst_release(&rt->u.dst);
- return NULL;
- }
-
- fl.proto = IPPROTO_TCP;
- fl.fl_ip_sport = tcph->dest;
- fl.fl_ip_dport = tcph->source;
-
- xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0);
-
- return rt;
-}
-
/* Send RST reply */
static void send_reset(struct sk_buff *oldskb, int hook)
{
struct sk_buff *nskb;
struct iphdr *iph = oldskb->nh.iph;
struct tcphdr _otcph, *oth, *tcph;
- struct rtable *rt;
- u_int16_t tmp_port;
- u_int32_t tmp_addr;
- unsigned int tcplen;
+ __be16 tmp_port;
+ __be32 tmp_addr;
int needs_ack;
- int hh_len;
+ unsigned int addr_type;
/* IP header checks: fragment. */
if (oldskb->nh.iph->frag_off & htons(IP_OFFSET))
return;
/* Check checksum */
- tcplen = oldskb->len - iph->ihl * 4;
- if (((hook != NF_IP_LOCAL_IN && oldskb->ip_summed != CHECKSUM_HW) ||
- (hook == NF_IP_LOCAL_IN &&
- oldskb->ip_summed != CHECKSUM_UNNECESSARY)) &&
- csum_tcpudp_magic(iph->saddr, iph->daddr, tcplen, IPPROTO_TCP,
- oldskb->ip_summed == CHECKSUM_HW ? oldskb->csum :
- skb_checksum(oldskb, iph->ihl * 4, tcplen, 0)))
+ if (nf_ip_checksum(oldskb, hook, iph->ihl * 4, IPPROTO_TCP))
return;
- if ((rt = route_reverse(oldskb, oth, hook)) == NULL)
- return;
-
- hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
-
/* We need a linear, writeable skb. We also need to expand
headroom in case hh_len of incoming interface < hh_len of
outgoing interface */
- nskb = skb_copy_expand(oldskb, hh_len, skb_tailroom(oldskb),
+ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb),
GFP_ATOMIC);
- if (!nskb) {
- dst_release(&rt->u.dst);
+ if (!nskb)
return;
- }
-
- dst_release(nskb->dst);
- nskb->dst = &rt->u.dst;
/* This packet will not be the same as the other: clear nf fields */
nf_reset(nskb);
- nskb->nfmark = 0;
-#ifdef CONFIG_BRIDGE_NETFILTER
- nf_bridge_put(nskb->nf_bridge);
- nskb->nf_bridge = NULL;
-#endif
+ nskb->mark = 0;
+ skb_init_secmark(nskb);
+
+ skb_shinfo(nskb)->gso_size = 0;
+ skb_shinfo(nskb)->gso_segs = 0;
+ skb_shinfo(nskb)->gso_type = 0;
tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl);
csum_partial((char *)tcph,
sizeof(struct tcphdr), 0));
- /* Adjust IP TTL, DF */
- nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
/* Set DF, id = 0 */
nskb->nh.iph->frag_off = htons(IP_DF);
nskb->nh.iph->id = 0;
+ addr_type = RTN_UNSPEC;
+ if (hook != NF_IP_FORWARD
+#ifdef CONFIG_BRIDGE_NETFILTER
+ || (nskb->nf_bridge && nskb->nf_bridge->mask & BRNF_BRIDGED)
+#endif
+ )
+ addr_type = RTN_LOCAL;
+
+ if (ip_route_me_harder(&nskb, addr_type))
+ goto free_nskb;
+
+ nskb->ip_summed = CHECKSUM_NONE;
+
+ /* Adjust IP TTL */
+ nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
+
/* Adjust IP checksum */
nskb->nh.iph->check = 0;
nskb->nh.iph->check = ip_fast_csum((unsigned char *)nskb->nh.iph,
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 ipt_reject_info *reject = targinfo;
static int check(const char *tablename,
const void *e_void,
+ const struct xt_target *target,
void *targinfo,
- unsigned int targinfosize,
unsigned int hook_mask)
{
const struct ipt_reject_info *rejinfo = targinfo;
const struct ipt_entry *e = e_void;
- if (targinfosize != IPT_ALIGN(sizeof(struct ipt_reject_info))) {
- DEBUGP("REJECT: targinfosize %u != 0\n", targinfosize);
- return 0;
- }
-
- /* Only allow these for packet filtering. */
- if (strcmp(tablename, "filter") != 0) {
- DEBUGP("REJECT: bad table `%s'.\n", tablename);
- return 0;
- }
- if ((hook_mask & ~((1 << NF_IP_LOCAL_IN)
- | (1 << NF_IP_FORWARD)
- | (1 << NF_IP_LOCAL_OUT))) != 0) {
- DEBUGP("REJECT: bad hook mask %X\n", hook_mask);
- return 0;
- }
-
if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
printk("REJECT: ECHOREPLY no longer supported.\n");
return 0;
return 0;
}
}
-
return 1;
}
static struct ipt_target ipt_reject_reg = {
.name = "REJECT",
.target = reject,
+ .targetsize = sizeof(struct ipt_reject_info),
+ .table = "filter",
+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) |
+ (1 << NF_IP_LOCAL_OUT),
.checkentry = check,
.me = THIS_MODULE,
};
-static int __init init(void)
+static int __init ipt_reject_init(void)
{
return ipt_register_target(&ipt_reject_reg);
}
-static void __exit fini(void)
+static void __exit ipt_reject_fini(void)
{
ipt_unregister_target(&ipt_reject_reg);
}
-module_init(init);
-module_exit(fini);
+module_init(ipt_reject_init);
+module_exit(ipt_reject_fini);
git://git.onelab.eu / linux-2.6.git / blobdiff