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Diffstat (limited to 'net/ipv6/netfilter.c')
-rw-r--r--net/ipv6/netfilter.c144
1 files changed, 108 insertions, 36 deletions
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index 2e06724dc34..d38e6a8d8b9 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -1,8 +1,16 @@
+/*
+ * IPv6 specific functions of netfilter core
+ *
+ * Rusty Russell (C) 2000 -- This code is GPL.
+ * Patrick McHardy (C) 2006-2012
+ */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ipv6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
+#include <linux/export.h>
+#include <net/addrconf.h>
#include <net/dst.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
@@ -12,37 +20,50 @@
int ip6_route_me_harder(struct sk_buff *skb)
{
- struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct net *net = dev_net(skb_dst(skb)->dev);
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ unsigned int hh_len;
struct dst_entry *dst;
- struct flowi fl = {
- .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
- .mark = skb->mark,
- .nl_u =
- { .ip6_u =
- { .daddr = iph->daddr,
- .saddr = iph->saddr, } },
+ struct flowi6 fl6 = {
+ .flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
+ .flowi6_mark = skb->mark,
+ .daddr = iph->daddr,
+ .saddr = iph->saddr,
};
+ int err;
- dst = ip6_route_output(skb->sk, &fl);
-
-#ifdef CONFIG_XFRM
- if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
- xfrm_decode_session(skb, &fl, AF_INET6) == 0)
- if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
- return -1;
-#endif
-
- if (dst->error) {
- IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
+ dst = ip6_route_output(net, skb->sk, &fl6);
+ err = dst->error;
+ if (err) {
+ IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
dst_release(dst);
- return -EINVAL;
+ return err;
}
/* Drop old route. */
- dst_release(skb->dst);
+ skb_dst_drop(skb);
+
+ skb_dst_set(skb, dst);
+
+#ifdef CONFIG_XFRM
+ if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) {
+ skb_dst_set(skb, NULL);
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), skb->sk, 0);
+ if (IS_ERR(dst))
+ return PTR_ERR(dst);
+ skb_dst_set(skb, dst);
+ }
+#endif
+
+ /* Change in oif may mean change in hh_len. */
+ hh_len = skb_dst(skb)->dev->hard_header_len;
+ if (skb_headroom(skb) < hh_len &&
+ pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)),
+ 0, GFP_ATOMIC))
+ return -ENOMEM;
- skb->dst = dst;
return 0;
}
EXPORT_SYMBOL(ip6_route_me_harder);
@@ -55,6 +76,7 @@ EXPORT_SYMBOL(ip6_route_me_harder);
struct ip6_rt_info {
struct in6_addr daddr;
struct in6_addr saddr;
+ u_int32_t mark;
};
static void nf_ip6_saveroute(const struct sk_buff *skb,
@@ -63,10 +85,11 @@ static void nf_ip6_saveroute(const struct sk_buff *skb,
struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
if (entry->hook == NF_INET_LOCAL_OUT) {
- struct ipv6hdr *iph = ipv6_hdr(skb);
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
rt_info->daddr = iph->daddr;
rt_info->saddr = iph->saddr;
+ rt_info->mark = skb->mark;
}
}
@@ -76,24 +99,41 @@ static int nf_ip6_reroute(struct sk_buff *skb,
struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
if (entry->hook == NF_INET_LOCAL_OUT) {
- struct ipv6hdr *iph = ipv6_hdr(skb);
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
- !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
+ !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) ||
+ skb->mark != rt_info->mark)
return ip6_route_me_harder(skb);
}
return 0;
}
-static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl)
+static int nf_ip6_route(struct net *net, struct dst_entry **dst,
+ struct flowi *fl, bool strict)
{
- *dst = ip6_route_output(NULL, fl);
- return (*dst)->error;
+ static const struct ipv6_pinfo fake_pinfo;
+ static const struct inet_sock fake_sk = {
+ /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */
+ .sk.sk_bound_dev_if = 1,
+ .pinet6 = (struct ipv6_pinfo *) &fake_pinfo,
+ };
+ const void *sk = strict ? &fake_sk : NULL;
+ struct dst_entry *result;
+ int err;
+
+ result = ip6_route_output(net, sk, &fl->u.ip6);
+ err = result->error;
+ if (err)
+ dst_release(result);
+ else
+ *dst = result;
+ return err;
}
__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol)
{
- struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ const struct ipv6hdr *ip6h = ipv6_hdr(skb);
__sum16 csum = 0;
switch (skb->ip_summed) {
@@ -121,20 +161,51 @@ __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
}
return csum;
}
-
EXPORT_SYMBOL(nf_ip6_checksum);
+static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook,
+ unsigned int dataoff, unsigned int len,
+ u_int8_t protocol)
+{
+ const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ __wsum hsum;
+ __sum16 csum = 0;
+
+ switch (skb->ip_summed) {
+ case CHECKSUM_COMPLETE:
+ if (len == skb->len - dataoff)
+ return nf_ip6_checksum(skb, hook, dataoff, protocol);
+ /* fall through */
+ case CHECKSUM_NONE:
+ hsum = skb_checksum(skb, 0, dataoff, 0);
+ skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
+ &ip6h->daddr,
+ skb->len - dataoff,
+ protocol,
+ csum_sub(0, hsum)));
+ skb->ip_summed = CHECKSUM_NONE;
+ return __skb_checksum_complete_head(skb, dataoff + len);
+ }
+ return csum;
+};
+
+static const struct nf_ipv6_ops ipv6ops = {
+ .chk_addr = ipv6_chk_addr,
+};
+
static const struct nf_afinfo nf_ip6_afinfo = {
- .family = AF_INET6,
- .checksum = nf_ip6_checksum,
- .route = nf_ip6_route,
- .saveroute = nf_ip6_saveroute,
- .reroute = nf_ip6_reroute,
- .route_key_size = sizeof(struct ip6_rt_info),
+ .family = AF_INET6,
+ .checksum = nf_ip6_checksum,
+ .checksum_partial = nf_ip6_checksum_partial,
+ .route = nf_ip6_route,
+ .saveroute = nf_ip6_saveroute,
+ .reroute = nf_ip6_reroute,
+ .route_key_size = sizeof(struct ip6_rt_info),
};
int __init ipv6_netfilter_init(void)
{
+ RCU_INIT_POINTER(nf_ipv6_ops, &ipv6ops);
return nf_register_afinfo(&nf_ip6_afinfo);
}
@@ -143,5 +214,6 @@ int __init ipv6_netfilter_init(void)
*/
void ipv6_netfilter_fini(void)
{
+ RCU_INIT_POINTER(nf_ipv6_ops, NULL);
nf_unregister_afinfo(&nf_ip6_afinfo);
}
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