#include <net/tcp.h>
#include <net/route.h>
#include <net/dst.h>
+#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_REJECT.h>
#ifdef CONFIG_BRIDGE_NETFILTER
#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;
- security_skb_classify_flow(skb, &fl);
-
- 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;
__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))
oth = skb_header_pointer(oldskb, oldskb->nh.iph->ihl * 4,
sizeof(_otcph), &_otcph);
if (oth == NULL)
- return;
+ return;
/* No RST for RST. */
if (oth->rst)
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;
+ nskb->mark = 0;
skb_init_secmark(nskb);
tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl);
tcph->urg_ptr = 0;
/* Adjust TCP checksum */
- nskb->ip_summed = CHECKSUM_NONE;
tcph->check = 0;
- tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr),
+ tcph->check = tcp_v4_check(sizeof(struct tcphdr),
nskb->nh.iph->saddr,
nskb->nh.iph->daddr,
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,
+ nskb->nh.iph->check = ip_fast_csum((unsigned char *)nskb->nh.iph,
nskb->nh.iph->ihl);
/* "Never happens" */
static inline void send_unreach(struct sk_buff *skb_in, int code)
{
icmp_send(skb_in, ICMP_DEST_UNREACH, code, 0);
-}
+}
static unsigned int reject(struct sk_buff **pskb,
const struct net_device *in,
const struct ipt_reject_info *reject = targinfo;
/* Our naive response construction doesn't deal with IP
- options, and probably shouldn't try. */
+ options, and probably shouldn't try. */
if ((*pskb)->nh.iph->ihl<<2 != sizeof(struct iphdr))
return NF_DROP;
/* WARNING: This code causes reentry within iptables.
This means that the iptables jump stack is now crap. We
must return an absolute verdict. --RR */
- switch (reject->with) {
- case IPT_ICMP_NET_UNREACHABLE:
- send_unreach(*pskb, ICMP_NET_UNREACH);
- break;
- case IPT_ICMP_HOST_UNREACHABLE:
- send_unreach(*pskb, ICMP_HOST_UNREACH);
- break;
- case IPT_ICMP_PROT_UNREACHABLE:
- send_unreach(*pskb, ICMP_PROT_UNREACH);
- break;
- case IPT_ICMP_PORT_UNREACHABLE:
- send_unreach(*pskb, ICMP_PORT_UNREACH);
- break;
- case IPT_ICMP_NET_PROHIBITED:
- send_unreach(*pskb, ICMP_NET_ANO);
- break;
+ switch (reject->with) {
+ case IPT_ICMP_NET_UNREACHABLE:
+ send_unreach(*pskb, ICMP_NET_UNREACH);
+ break;
+ case IPT_ICMP_HOST_UNREACHABLE:
+ send_unreach(*pskb, ICMP_HOST_UNREACH);
+ break;
+ case IPT_ICMP_PROT_UNREACHABLE:
+ send_unreach(*pskb, ICMP_PROT_UNREACH);
+ break;
+ case IPT_ICMP_PORT_UNREACHABLE:
+ send_unreach(*pskb, ICMP_PORT_UNREACH);
+ break;
+ case IPT_ICMP_NET_PROHIBITED:
+ send_unreach(*pskb, ICMP_NET_ANO);
+ break;
case IPT_ICMP_HOST_PROHIBITED:
- send_unreach(*pskb, ICMP_HOST_ANO);
- break;
- case IPT_ICMP_ADMIN_PROHIBITED:
+ send_unreach(*pskb, ICMP_HOST_ANO);
+ break;
+ case IPT_ICMP_ADMIN_PROHIBITED:
send_unreach(*pskb, ICMP_PKT_FILTERED);
break;
case IPT_TCP_RESET:
void *targinfo,
unsigned int hook_mask)
{
- const struct ipt_reject_info *rejinfo = targinfo;
+ const struct ipt_reject_info *rejinfo = targinfo;
const struct ipt_entry *e = e_void;
if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
} else if (rejinfo->with == IPT_TCP_RESET) {
/* Must specify that it's a TCP packet */
if (e->ip.proto != IPPROTO_TCP
- || (e->ip.invflags & IPT_INV_PROTO)) {
+ || (e->ip.invflags & XT_INV_PROTO)) {
DEBUGP("REJECT: TCP_RESET invalid for non-tcp\n");
return 0;
}
return 1;
}
-static struct ipt_target ipt_reject_reg = {
+static struct xt_target ipt_reject_reg = {
.name = "REJECT",
+ .family = AF_INET,
.target = reject,
.targetsize = sizeof(struct ipt_reject_info),
.table = "filter",
static int __init ipt_reject_init(void)
{
- return ipt_register_target(&ipt_reject_reg);
+ return xt_register_target(&ipt_reject_reg);
}
static void __exit ipt_reject_fini(void)
{
- ipt_unregister_target(&ipt_reject_reg);
+ xt_unregister_target(&ipt_reject_reg);
}
module_init(ipt_reject_init);
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blobdiff