/*
* This is a module which is used for rejecting packets.
- * Added support for customized reject packets (Jozsef Kadlecsik).
- * Added support for ICMP type-3-code-13 (Maciej Soltysiak). [RFC 1812]
*/
/* (C) 1999-2001 Paul `Rusty' Russell
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables REJECT target module");
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
/* Send RST reply */
static void send_reset(struct sk_buff *oldskb, int hook)
{
struct sk_buff *nskb;
- struct iphdr *iph = oldskb->nh.iph;
+ struct iphdr *niph;
struct tcphdr _otcph, *oth, *tcph;
__be16 tmp_port;
__be32 tmp_addr;
unsigned int addr_type;
/* IP header checks: fragment. */
- if (oldskb->nh.iph->frag_off & htons(IP_OFFSET))
+ if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET))
return;
- oth = skb_header_pointer(oldskb, oldskb->nh.iph->ihl * 4,
+ oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb),
sizeof(_otcph), &_otcph);
if (oth == NULL)
return;
return;
/* Check checksum */
- if (nf_ip_checksum(oldskb, hook, iph->ihl * 4, IPPROTO_TCP))
+ if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP))
return;
/* We need a linear, writeable skb. We also need to expand
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);
+ tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb));
/* Swap source and dest */
- tmp_addr = nskb->nh.iph->saddr;
- nskb->nh.iph->saddr = nskb->nh.iph->daddr;
- nskb->nh.iph->daddr = tmp_addr;
+ niph = ip_hdr(nskb);
+ tmp_addr = niph->saddr;
+ niph->saddr = niph->daddr;
+ niph->daddr = tmp_addr;
tmp_port = tcph->source;
tcph->source = tcph->dest;
tcph->dest = tmp_port;
/* Truncate to length (no data) */
tcph->doff = sizeof(struct tcphdr)/4;
- skb_trim(nskb, nskb->nh.iph->ihl*4 + sizeof(struct tcphdr));
- nskb->nh.iph->tot_len = htons(nskb->len);
+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr));
if (tcph->ack) {
needs_ack = 0;
tcph->ack_seq = 0;
} else {
needs_ack = 1;
- tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin
- + oldskb->len - oldskb->nh.iph->ihl*4
- - (oth->doff<<2));
+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin +
+ oldskb->len - ip_hdrlen(oldskb) -
+ (oth->doff << 2));
tcph->seq = 0;
}
/* Adjust TCP checksum */
tcph->check = 0;
tcph->check = tcp_v4_check(sizeof(struct tcphdr),
- nskb->nh.iph->saddr,
- nskb->nh.iph->daddr,
- csum_partial((char *)tcph,
+ niph->saddr, niph->daddr,
+ csum_partial(tcph,
sizeof(struct tcphdr), 0));
/* Set DF, id = 0 */
- nskb->nh.iph->frag_off = htons(IP_DF);
- nskb->nh.iph->id = 0;
+ niph->frag_off = htons(IP_DF);
+ niph->id = 0;
addr_type = RTN_UNSPEC;
- if (hook != NF_IP_FORWARD
+ if (hook != NF_INET_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))
+ 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,
- nskb->nh.iph->ihl);
+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
/* "Never happens" */
if (nskb->len > dst_mtu(nskb->dst))
nf_ct_attach(nskb, oldskb);
- NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
- dst_output);
+ ip_local_out(nskb);
return;
free_nskb:
icmp_send(skb_in, ICMP_DEST_UNREACH, code, 0);
}
-static unsigned int reject(struct sk_buff **pskb,
+static unsigned int reject(struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
unsigned int hooknum,
/* Our naive response construction doesn't deal with IP
options, and probably shouldn't try. */
- if ((*pskb)->nh.iph->ihl<<2 != sizeof(struct iphdr))
+ if (ip_hdrlen(skb) != sizeof(struct iphdr))
return NF_DROP;
/* WARNING: This code causes reentry within iptables.
must return an absolute verdict. --RR */
switch (reject->with) {
case IPT_ICMP_NET_UNREACHABLE:
- send_unreach(*pskb, ICMP_NET_UNREACH);
+ send_unreach(skb, ICMP_NET_UNREACH);
break;
case IPT_ICMP_HOST_UNREACHABLE:
- send_unreach(*pskb, ICMP_HOST_UNREACH);
+ send_unreach(skb, ICMP_HOST_UNREACH);
break;
case IPT_ICMP_PROT_UNREACHABLE:
- send_unreach(*pskb, ICMP_PROT_UNREACH);
+ send_unreach(skb, ICMP_PROT_UNREACH);
break;
case IPT_ICMP_PORT_UNREACHABLE:
- send_unreach(*pskb, ICMP_PORT_UNREACH);
+ send_unreach(skb, ICMP_PORT_UNREACH);
break;
case IPT_ICMP_NET_PROHIBITED:
- send_unreach(*pskb, ICMP_NET_ANO);
+ send_unreach(skb, ICMP_NET_ANO);
break;
case IPT_ICMP_HOST_PROHIBITED:
- send_unreach(*pskb, ICMP_HOST_ANO);
+ send_unreach(skb, ICMP_HOST_ANO);
break;
case IPT_ICMP_ADMIN_PROHIBITED:
- send_unreach(*pskb, ICMP_PKT_FILTERED);
+ send_unreach(skb, ICMP_PKT_FILTERED);
break;
case IPT_TCP_RESET:
- send_reset(*pskb, hooknum);
+ send_reset(skb, hooknum);
case IPT_ICMP_ECHOREPLY:
/* Doesn't happen. */
break;
return NF_DROP;
}
-static int check(const char *tablename,
- const void *e_void,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
+static bool check(const char *tablename,
+ const void *e_void,
+ const struct xt_target *target,
+ void *targinfo,
+ unsigned int hook_mask)
{
const struct ipt_reject_info *rejinfo = targinfo;
const struct ipt_entry *e = e_void;
if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
- printk("REJECT: ECHOREPLY no longer supported.\n");
- return 0;
+ printk("ipt_REJECT: ECHOREPLY no longer supported.\n");
+ return false;
} else if (rejinfo->with == IPT_TCP_RESET) {
/* Must specify that it's a TCP packet */
if (e->ip.proto != IPPROTO_TCP
|| (e->ip.invflags & XT_INV_PROTO)) {
- DEBUGP("REJECT: TCP_RESET invalid for non-tcp\n");
- return 0;
+ printk("ipt_REJECT: TCP_RESET invalid for non-tcp\n");
+ return false;
}
}
- return 1;
+ return true;
}
-static struct xt_target ipt_reject_reg = {
+static struct xt_target ipt_reject_reg __read_mostly = {
.name = "REJECT",
.family = AF_INET,
.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),
+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
+ (1 << NF_INET_LOCAL_OUT),
.checkentry = check,
.me = THIS_MODULE,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff