fl.fl_ip_sport = tcph->dest;
fl.fl_ip_dport = tcph->source;
- if (xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0)) {
- dst_release(&rt->u.dst);
- rt = NULL;
- }
+ xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0);
return rt;
}
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;
if (oth->rst)
return;
- /* FIXME: Check checksum --RR */
+ /* Check checksum */
+ if (nf_ip_checksum(oldskb, hook, iph->ihl * 4, IPPROTO_TCP))
+ return;
+
if ((rt = route_reverse(oldskb, oth, hook)) == NULL)
return;
/* This packet will not be the same as the other: clear nf fields */
nf_reset(nskb);
- nskb->nfcache = 0;
nskb->nfmark = 0;
-#ifdef CONFIG_BRIDGE_NETFILTER
- nf_bridge_put(nskb->nf_bridge);
- nskb->nf_bridge = NULL;
-#endif
tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl);
sizeof(struct tcphdr), 0));
/* Adjust IP TTL, DF */
- nskb->nh.iph->ttl = MAXTTL;
+ 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;
nskb->nh.iph->ihl);
/* "Never happens" */
- if (nskb->len > dst_pmtu(nskb->dst))
+ if (nskb->len > dst_mtu(nskb->dst))
goto free_nskb;
nf_ct_attach(nskb, oldskb);
NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
- ip_finish_output);
+ dst_output);
return;
free_nskb:
kfree_skb(nskb);
}
-static void send_unreach(struct sk_buff *skb_in, int code)
+static inline void send_unreach(struct sk_buff *skb_in, int code)
{
- struct iphdr *iph;
- struct icmphdr *icmph;
- struct sk_buff *nskb;
- u32 saddr;
- u8 tos;
- int hh_len, length;
- struct rtable *rt = (struct rtable*)skb_in->dst;
- unsigned char *data;
-
- if (!rt)
- return;
-
- /* FIXME: Use sysctl number. --RR */
- if (!xrlim_allow(&rt->u.dst, 1*HZ))
- return;
-
- iph = skb_in->nh.iph;
-
- /* No replies to physical multicast/broadcast */
- if (skb_in->pkt_type!=PACKET_HOST)
- return;
-
- /* Now check at the protocol level */
- if (rt->rt_flags&(RTCF_BROADCAST|RTCF_MULTICAST))
- return;
-
- /* Only reply to fragment 0. */
- if (iph->frag_off&htons(IP_OFFSET))
- return;
-
- /* Ensure we have at least 8 bytes of proto header. */
- if (skb_in->len < skb_in->nh.iph->ihl*4 + 8)
- return;
-
- /* If we send an ICMP error to an ICMP error a mess would result.. */
- if (iph->protocol == IPPROTO_ICMP) {
- struct icmphdr ihdr;
-
- icmph = skb_header_pointer(skb_in, skb_in->nh.iph->ihl*4,
- sizeof(ihdr), &ihdr);
- if (!icmph)
- return;
-
- /* Between echo-reply (0) and timestamp (13),
- everything except echo-request (8) is an error.
- Also, anything greater than NR_ICMP_TYPES is
- unknown, and hence should be treated as an error... */
- if ((icmph->type < ICMP_TIMESTAMP
- && icmph->type != ICMP_ECHOREPLY
- && icmph->type != ICMP_ECHO)
- || icmph->type > NR_ICMP_TYPES)
- return;
- }
-
- saddr = iph->daddr;
- if (!(rt->rt_flags & RTCF_LOCAL))
- saddr = 0;
-
- tos = (iph->tos & IPTOS_TOS_MASK) | IPTOS_PREC_INTERNETCONTROL;
-
- {
- struct flowi fl = {
- .nl_u = {
- .ip4_u = {
- .daddr = skb_in->nh.iph->saddr,
- .saddr = saddr,
- .tos = RT_TOS(tos)
- }
- },
- .proto = IPPROTO_ICMP,
- .uli_u = {
- .icmpt = {
- .type = ICMP_DEST_UNREACH,
- .code = code
- }
- }
- };
-
- if (ip_route_output_key(&rt, &fl))
- return;
- }
- /* RFC says return as much as we can without exceeding 576 bytes. */
- length = skb_in->len + sizeof(struct iphdr) + sizeof(struct icmphdr);
-
- if (length > dst_pmtu(&rt->u.dst))
- length = dst_pmtu(&rt->u.dst);
- if (length > 576)
- length = 576;
-
- hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
-
- nskb = alloc_skb(hh_len + length, GFP_ATOMIC);
- if (!nskb) {
- ip_rt_put(rt);
- return;
- }
-
- nskb->priority = 0;
- nskb->dst = &rt->u.dst;
- skb_reserve(nskb, hh_len);
-
- /* Set up IP header */
- iph = nskb->nh.iph
- = (struct iphdr *)skb_put(nskb, sizeof(struct iphdr));
- iph->version=4;
- iph->ihl=5;
- iph->tos=tos;
- iph->tot_len = htons(length);
-
- /* PMTU discovery never applies to ICMP packets. */
- iph->frag_off = 0;
-
- iph->ttl = MAXTTL;
- ip_select_ident(iph, &rt->u.dst, NULL);
- iph->protocol=IPPROTO_ICMP;
- iph->saddr=rt->rt_src;
- iph->daddr=rt->rt_dst;
- iph->check=0;
- iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
-
- /* Set up ICMP header. */
- icmph = nskb->h.icmph
- = (struct icmphdr *)skb_put(nskb, sizeof(struct icmphdr));
- icmph->type = ICMP_DEST_UNREACH;
- icmph->code = code;
- icmph->un.gateway = 0;
- icmph->checksum = 0;
-
- /* Copy as much of original packet as will fit */
- data = skb_put(nskb,
- length - sizeof(struct iphdr) - sizeof(struct icmphdr));
-
- skb_copy_bits(skb_in, 0, data,
- length - sizeof(struct iphdr) - sizeof(struct icmphdr));
-
- icmph->checksum = ip_compute_csum((unsigned char *)icmph,
- length - sizeof(struct iphdr));
-
- nf_ct_attach(nskb, skb_in);
-
- NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
- ip_finish_output);
+ icmp_send(skb_in, ICMP_DEST_UNREACH, code, 0);
}
static unsigned int reject(struct sk_buff **pskb,
const struct net_device *in,
const struct net_device *out,
unsigned int hooknum,
+ const struct xt_target *target,
const void *targinfo,
void *userinfo)
{
}
static int check(const char *tablename,
- const struct ipt_entry *e,
+ 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;
-
- 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;
- }
+ const struct ipt_entry *e = e_void;
if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
printk("REJECT: ECHOREPLY no longer supported.\n");
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