*
* Changes:
*
+ * Description of forwarding methods:
+ * - all transmitters are called from LOCAL_IN (remote clients) and
+ * LOCAL_OUT (local clients) but for ICMP can be called from FORWARD
+ * - not all connections have destination server, for example,
+ * connections in backup server when fwmark is used
+ * - bypass connections use daddr from packet
+ * LOCAL_OUT rules:
+ * - skb->dev is NULL, skb->protocol is not set (both are set in POST_ROUTING)
+ * - skb->pkt_type is not set yet
+ * - the only place where we can see skb->sk != NULL
*/
#define KMSG_COMPONENT "IPVS"
#include <net/route.h> /* for ip_route_output */
#include <net/ipv6.h>
#include <net/ip6_route.h>
+#include <net/addrconf.h>
#include <linux/icmpv6.h>
#include <linux/netfilter.h>
-#include <net/netfilter/nf_conntrack.h>
#include <linux/netfilter_ipv4.h>
#include <net/ip_vs.h>
* Destination cache to speed up outgoing route lookup
*/
static inline void
-__ip_vs_dst_set(struct ip_vs_dest *dest, u32 rtos, struct dst_entry *dst)
+__ip_vs_dst_set(struct ip_vs_dest *dest, u32 rtos, struct dst_entry *dst,
+ u32 dst_cookie)
{
struct dst_entry *old_dst;
old_dst = dest->dst_cache;
dest->dst_cache = dst;
dest->dst_rtos = rtos;
+ dest->dst_cookie = dst_cookie;
dst_release(old_dst);
}
static inline struct dst_entry *
-__ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos, u32 cookie)
+__ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos)
{
struct dst_entry *dst = dest->dst_cache;
if (!dst)
return NULL;
- if ((dst->obsolete
- || (dest->af == AF_INET && rtos != dest->dst_rtos)) &&
- dst->ops->check(dst, cookie) == NULL) {
+ if ((dst->obsolete || rtos != dest->dst_rtos) &&
+ dst->ops->check(dst, dest->dst_cookie) == NULL) {
dest->dst_cache = NULL;
dst_release(dst);
return NULL;
return dst;
}
+/*
+ * Get route to destination or remote server
+ * rt_mode: flags, &1=Allow local dest, &2=Allow non-local dest,
+ * &4=Allow redirect from remote daddr to local
+ */
static struct rtable *
-__ip_vs_get_out_rt(struct ip_vs_conn *cp, u32 rtos)
+__ip_vs_get_out_rt(struct sk_buff *skb, struct ip_vs_dest *dest,
+ __be32 daddr, u32 rtos, int rt_mode)
{
+ struct net *net = dev_net(skb_dst(skb)->dev);
struct rtable *rt; /* Route to the other host */
- struct ip_vs_dest *dest = cp->dest;
+ struct rtable *ort; /* Original route */
+ int local;
if (dest) {
spin_lock(&dest->dst_lock);
if (!(rt = (struct rtable *)
- __ip_vs_dst_check(dest, rtos, 0))) {
+ __ip_vs_dst_check(dest, rtos))) {
struct flowi fl = {
- .oif = 0,
- .nl_u = {
- .ip4_u = {
- .daddr = dest->addr.ip,
- .saddr = 0,
- .tos = rtos, } },
+ .fl4_dst = dest->addr.ip,
+ .fl4_tos = rtos,
};
- if (ip_route_output_key(&init_net, &rt, &fl)) {
+ if (ip_route_output_key(net, &rt, &fl)) {
spin_unlock(&dest->dst_lock);
IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n",
&dest->addr.ip);
return NULL;
}
- __ip_vs_dst_set(dest, rtos, dst_clone(&rt->dst));
+ __ip_vs_dst_set(dest, rtos, dst_clone(&rt->dst), 0);
IP_VS_DBG(10, "new dst %pI4, refcnt=%d, rtos=%X\n",
&dest->addr.ip,
atomic_read(&rt->dst.__refcnt), rtos);
spin_unlock(&dest->dst_lock);
} else {
struct flowi fl = {
- .oif = 0,
- .nl_u = {
- .ip4_u = {
- .daddr = cp->daddr.ip,
- .saddr = 0,
- .tos = rtos, } },
+ .fl4_dst = daddr,
+ .fl4_tos = rtos,
};
- if (ip_route_output_key(&init_net, &rt, &fl)) {
+ if (ip_route_output_key(net, &rt, &fl)) {
IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n",
- &cp->daddr.ip);
+ &daddr);
return NULL;
}
}
+ local = rt->rt_flags & RTCF_LOCAL;
+ if (!((local ? 1 : 2) & rt_mode)) {
+ IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI4\n",
+ (rt->rt_flags & RTCF_LOCAL) ?
+ "local":"non-local", &rt->rt_dst);
+ ip_rt_put(rt);
+ return NULL;
+ }
+ if (local && !(rt_mode & 4) && !((ort = skb_rtable(skb)) &&
+ ort->rt_flags & RTCF_LOCAL)) {
+ IP_VS_DBG_RL("Redirect from non-local address %pI4 to local "
+ "requires NAT method, dest: %pI4\n",
+ &ip_hdr(skb)->daddr, &rt->rt_dst);
+ ip_rt_put(rt);
+ return NULL;
+ }
+ if (unlikely(!local && ipv4_is_loopback(ip_hdr(skb)->saddr))) {
+ IP_VS_DBG_RL("Stopping traffic from loopback address %pI4 "
+ "to non-local address, dest: %pI4\n",
+ &ip_hdr(skb)->saddr, &rt->rt_dst);
+ ip_rt_put(rt);
+ return NULL;
+ }
+
return rt;
}
+/* Reroute packet to local IPv4 stack after DNAT */
+static int
+__ip_vs_reroute_locally(struct sk_buff *skb)
+{
+ struct rtable *rt = skb_rtable(skb);
+ struct net_device *dev = rt->dst.dev;
+ struct net *net = dev_net(dev);
+ struct iphdr *iph = ip_hdr(skb);
+
+ if (rt_is_input_route(rt)) {
+ unsigned long orefdst = skb->_skb_refdst;
+
+ if (ip_route_input(skb, iph->daddr, iph->saddr,
+ iph->tos, skb->dev))
+ return 0;
+ refdst_drop(orefdst);
+ } else {
+ struct flowi fl = {
+ .fl4_dst = iph->daddr,
+ .fl4_src = iph->saddr,
+ .fl4_tos = RT_TOS(iph->tos),
+ .mark = skb->mark,
+ };
+ struct rtable *rt;
+
+ if (ip_route_output_key(net, &rt, &fl))
+ return 0;
+ if (!(rt->rt_flags & RTCF_LOCAL)) {
+ ip_rt_put(rt);
+ return 0;
+ }
+ /* Drop old route. */
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ }
+ return 1;
+}
+
#ifdef CONFIG_IP_VS_IPV6
+
+static inline int __ip_vs_is_local_route6(struct rt6_info *rt)
+{
+ return rt->rt6i_dev && rt->rt6i_dev->flags & IFF_LOOPBACK;
+}
+
+static struct dst_entry *
+__ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr,
+ struct in6_addr *ret_saddr, int do_xfrm)
+{
+ struct dst_entry *dst;
+ struct flowi fl = {
+ .fl6_dst = *daddr,
+ };
+
+ dst = ip6_route_output(net, NULL, &fl);
+ if (dst->error)
+ goto out_err;
+ if (!ret_saddr)
+ return dst;
+ if (ipv6_addr_any(&fl.fl6_src) &&
+ ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
+ &fl.fl6_dst, 0, &fl.fl6_src) < 0)
+ goto out_err;
+ if (do_xfrm && xfrm_lookup(net, &dst, &fl, NULL, 0) < 0)
+ goto out_err;
+ ipv6_addr_copy(ret_saddr, &fl.fl6_src);
+ return dst;
+
+out_err:
+ dst_release(dst);
+ IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr);
+ return NULL;
+}
+
+/*
+ * Get route to destination or remote server
+ * rt_mode: flags, &1=Allow local dest, &2=Allow non-local dest,
+ * &4=Allow redirect from remote daddr to local
+ */
static struct rt6_info *
-__ip_vs_get_out_rt_v6(struct ip_vs_conn *cp)
+__ip_vs_get_out_rt_v6(struct sk_buff *skb, struct ip_vs_dest *dest,
+ struct in6_addr *daddr, struct in6_addr *ret_saddr,
+ int do_xfrm, int rt_mode)
{
+ struct net *net = dev_net(skb_dst(skb)->dev);
struct rt6_info *rt; /* Route to the other host */
- struct ip_vs_dest *dest = cp->dest;
+ struct rt6_info *ort; /* Original route */
+ struct dst_entry *dst;
+ int local;
if (dest) {
spin_lock(&dest->dst_lock);
- rt = (struct rt6_info *)__ip_vs_dst_check(dest, 0, 0);
+ rt = (struct rt6_info *)__ip_vs_dst_check(dest, 0);
if (!rt) {
- struct flowi fl = {
- .oif = 0,
- .nl_u = {
- .ip6_u = {
- .daddr = dest->addr.in6,
- .saddr = {
- .s6_addr32 =
- { 0, 0, 0, 0 },
- },
- },
- },
- };
+ u32 cookie;
- rt = (struct rt6_info *)ip6_route_output(&init_net,
- NULL, &fl);
- if (!rt) {
+ dst = __ip_vs_route_output_v6(net, &dest->addr.in6,
+ &dest->dst_saddr,
+ do_xfrm);
+ if (!dst) {
spin_unlock(&dest->dst_lock);
- IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n",
- &dest->addr.in6);
return NULL;
}
- __ip_vs_dst_set(dest, 0, dst_clone(&rt->dst));
- IP_VS_DBG(10, "new dst %pI6, refcnt=%d\n",
- &dest->addr.in6,
+ rt = (struct rt6_info *) dst;
+ cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
+ __ip_vs_dst_set(dest, 0, dst_clone(&rt->dst), cookie);
+ IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n",
+ &dest->addr.in6, &dest->dst_saddr,
atomic_read(&rt->dst.__refcnt));
}
+ if (ret_saddr)
+ ipv6_addr_copy(ret_saddr, &dest->dst_saddr);
spin_unlock(&dest->dst_lock);
} else {
- struct flowi fl = {
- .oif = 0,
- .nl_u = {
- .ip6_u = {
- .daddr = cp->daddr.in6,
- .saddr = {
- .s6_addr32 = { 0, 0, 0, 0 },
- },
- },
- },
- };
-
- rt = (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
- if (!rt) {
- IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n",
- &cp->daddr.in6);
+ dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm);
+ if (!dst)
return NULL;
- }
+ rt = (struct rt6_info *) dst;
+ }
+
+ local = __ip_vs_is_local_route6(rt);
+ if (!((local ? 1 : 2) & rt_mode)) {
+ IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI6\n",
+ local ? "local":"non-local", daddr);
+ dst_release(&rt->dst);
+ return NULL;
+ }
+ if (local && !(rt_mode & 4) &&
+ !((ort = (struct rt6_info *) skb_dst(skb)) &&
+ __ip_vs_is_local_route6(ort))) {
+ IP_VS_DBG_RL("Redirect from non-local address %pI6 to local "
+ "requires NAT method, dest: %pI6\n",
+ &ipv6_hdr(skb)->daddr, daddr);
+ dst_release(&rt->dst);
+ return NULL;
+ }
+ if (unlikely(!local && (!skb->dev || skb->dev->flags & IFF_LOOPBACK) &&
+ ipv6_addr_type(&ipv6_hdr(skb)->saddr) &
+ IPV6_ADDR_LOOPBACK)) {
+ IP_VS_DBG_RL("Stopping traffic from loopback address %pI6 "
+ "to non-local address, dest: %pI6\n",
+ &ipv6_hdr(skb)->saddr, daddr);
+ dst_release(&rt->dst);
+ return NULL;
}
return rt;
dst_release(old_dst);
}
-#define IP_VS_XMIT(pf, skb, rt) \
+#define IP_VS_XMIT_TUNNEL(skb, cp) \
+({ \
+ int __ret = NF_ACCEPT; \
+ \
+ (skb)->ipvs_property = 1; \
+ if (unlikely((cp)->flags & IP_VS_CONN_F_NFCT)) \
+ __ret = ip_vs_confirm_conntrack(skb, cp); \
+ if (__ret == NF_ACCEPT) { \
+ nf_reset(skb); \
+ skb_forward_csum(skb); \
+ } \
+ __ret; \
+})
+
+#define IP_VS_XMIT_NAT(pf, skb, cp, local) \
do { \
(skb)->ipvs_property = 1; \
+ if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \
+ ip_vs_notrack(skb); \
+ else \
+ ip_vs_update_conntrack(skb, cp, 1); \
+ if (local) \
+ return NF_ACCEPT; \
skb_forward_csum(skb); \
NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \
- (rt)->dst.dev, dst_output); \
+ skb_dst(skb)->dev, dst_output); \
+} while (0)
+
+#define IP_VS_XMIT(pf, skb, cp, local) \
+do { \
+ (skb)->ipvs_property = 1; \
+ if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \
+ ip_vs_notrack(skb); \
+ if (local) \
+ return NF_ACCEPT; \
+ skb_forward_csum(skb); \
+ NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \
+ skb_dst(skb)->dev, dst_output); \
} while (0)
struct ip_vs_protocol *pp)
{
/* we do not touch skb and do not need pskb ptr */
- return NF_ACCEPT;
+ IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1);
}
{
struct rtable *rt; /* Route to the other host */
struct iphdr *iph = ip_hdr(skb);
- u8 tos = iph->tos;
int mtu;
- struct flowi fl = {
- .oif = 0,
- .nl_u = {
- .ip4_u = {
- .daddr = iph->daddr,
- .saddr = 0,
- .tos = RT_TOS(tos), } },
- };
EnterFunction(10);
- if (ip_route_output_key(&init_net, &rt, &fl)) {
- IP_VS_DBG_RL("%s(): ip_route_output error, dest: %pI4\n",
- __func__, &iph->daddr);
+ if (!(rt = __ip_vs_get_out_rt(skb, NULL, iph->daddr,
+ RT_TOS(iph->tos), 2)))
goto tx_error_icmp;
- }
/* MTU checking */
mtu = dst_mtu(&rt->dst);
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(NFPROTO_IPV4, skb, rt);
+ IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0);
LeaveFunction(10);
return NF_STOLEN;
struct rt6_info *rt; /* Route to the other host */
struct ipv6hdr *iph = ipv6_hdr(skb);
int mtu;
- struct flowi fl = {
- .oif = 0,
- .nl_u = {
- .ip6_u = {
- .daddr = iph->daddr,
- .saddr = { .s6_addr32 = {0, 0, 0, 0} }, } },
- };
EnterFunction(10);
- rt = (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
- if (!rt) {
- IP_VS_DBG_RL("%s(): ip6_route_output error, dest: %pI6\n",
- __func__, &iph->daddr);
+ if (!(rt = __ip_vs_get_out_rt_v6(skb, NULL, &iph->daddr, NULL, 0, 2)))
goto tx_error_icmp;
- }
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if (skb->len > mtu) {
- dst_release(&rt->dst);
+ if (!skb->dev) {
+ struct net *net = dev_net(skb_dst(skb)->dev);
+
+ skb->dev = net->loopback_dev;
+ }
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ dst_release(&rt->dst);
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
goto tx_error;
}
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(NFPROTO_IPV6, skb, rt);
+ IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0);
LeaveFunction(10);
return NF_STOLEN;
}
#endif
-void
-ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, int outin)
-{
- struct nf_conn *ct = (struct nf_conn *)skb->nfct;
- struct nf_conntrack_tuple new_tuple;
-
- if (ct == NULL || nf_ct_is_untracked(ct) || nf_ct_is_confirmed(ct))
- return;
-
- /*
- * The connection is not yet in the hashtable, so we update it.
- * CIP->VIP will remain the same, so leave the tuple in
- * IP_CT_DIR_ORIGINAL untouched. When the reply comes back from the
- * real-server we will see RIP->DIP.
- */
- new_tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
- if (outin)
- new_tuple.src.u3 = cp->daddr;
- else
- new_tuple.dst.u3 = cp->vaddr;
- /*
- * This will also take care of UDP and other protocols.
- */
- if (outin)
- new_tuple.src.u.tcp.port = cp->dport;
- else
- new_tuple.dst.u.tcp.port = cp->vport;
- nf_conntrack_alter_reply(ct, &new_tuple);
-}
-
/*
* NAT transmitter (only for outside-to-inside nat forwarding)
* Not used for related ICMP
struct rtable *rt; /* Route to the other host */
int mtu;
struct iphdr *iph = ip_hdr(skb);
+ int local;
EnterFunction(10);
IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p));
}
- if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(iph->tos))))
+ if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip,
+ RT_TOS(iph->tos), 1|2|4)))
goto tx_error_icmp;
+ local = rt->rt_flags & RTCF_LOCAL;
+ /*
+ * Avoid duplicate tuple in reply direction for NAT traffic
+ * to local address when connection is sync-ed
+ */
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+ if (cp->flags & IP_VS_CONN_F_SYNC && local) {
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
+
+ if (ct && !nf_ct_is_untracked(ct)) {
+ IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0,
+ "ip_vs_nat_xmit(): "
+ "stopping DNAT to local address");
+ goto tx_error_put;
+ }
+ }
+#endif
+
+ /* From world but DNAT to loopback address? */
+ if (local && ipv4_is_loopback(rt->rt_dst) &&
+ rt_is_input_route(skb_rtable(skb))) {
+ IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): "
+ "stopping DNAT to loopback address");
+ goto tx_error_put;
+ }
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF))) {
- ip_rt_put(rt);
icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
- IP_VS_DBG_RL_PKT(0, pp, skb, 0, "ip_vs_nat_xmit(): frag needed for");
- goto tx_error;
+ IP_VS_DBG_RL_PKT(0, AF_INET, pp, skb, 0,
+ "ip_vs_nat_xmit(): frag needed for");
+ goto tx_error_put;
}
/* copy-on-write the packet before mangling it */
if (skb_cow(skb, rt->dst.dev->hard_header_len))
goto tx_error_put;
- /* drop old route */
- skb_dst_drop(skb);
- skb_dst_set(skb, &rt->dst);
-
/* mangle the packet */
if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp))
- goto tx_error;
+ goto tx_error_put;
ip_hdr(skb)->daddr = cp->daddr.ip;
ip_send_check(ip_hdr(skb));
- IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
+ if (!local) {
+ /* drop old route */
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ } else {
+ ip_rt_put(rt);
+ /*
+ * Some IPv4 replies get local address from routes,
+ * not from iph, so while we DNAT after routing
+ * we need this second input/output route.
+ */
+ if (!__ip_vs_reroute_locally(skb))
+ goto tx_error;
+ }
- ip_vs_update_conntrack(skb, cp, 1);
+ IP_VS_DBG_PKT(10, AF_INET, pp, skb, 0, "After DNAT");
/* FIXME: when application helper enlarges the packet and the length
is larger than the MTU of outgoing device, there will be still
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(NFPROTO_IPV4, skb, rt);
+ IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local);
LeaveFunction(10);
return NF_STOLEN;
tx_error_icmp:
dst_link_failure(skb);
tx_error:
- LeaveFunction(10);
kfree_skb(skb);
+ LeaveFunction(10);
return NF_STOLEN;
tx_error_put:
ip_rt_put(rt);
{
struct rt6_info *rt; /* Route to the other host */
int mtu;
+ int local;
EnterFunction(10);
IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p));
}
- rt = __ip_vs_get_out_rt_v6(cp);
- if (!rt)
+ if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL,
+ 0, 1|2|4)))
goto tx_error_icmp;
+ local = __ip_vs_is_local_route6(rt);
+ /*
+ * Avoid duplicate tuple in reply direction for NAT traffic
+ * to local address when connection is sync-ed
+ */
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+ if (cp->flags & IP_VS_CONN_F_SYNC && local) {
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
+
+ if (ct && !nf_ct_is_untracked(ct)) {
+ IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0,
+ "ip_vs_nat_xmit_v6(): "
+ "stopping DNAT to local address");
+ goto tx_error_put;
+ }
+ }
+#endif
+
+ /* From world but DNAT to loopback address? */
+ if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) &&
+ ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) {
+ IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, 0,
+ "ip_vs_nat_xmit_v6(): "
+ "stopping DNAT to loopback address");
+ goto tx_error_put;
+ }
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if (skb->len > mtu) {
- dst_release(&rt->dst);
+ if (!skb->dev) {
+ struct net *net = dev_net(skb_dst(skb)->dev);
+
+ skb->dev = net->loopback_dev;
+ }
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
- IP_VS_DBG_RL_PKT(0, pp, skb, 0,
+ IP_VS_DBG_RL_PKT(0, AF_INET6, pp, skb, 0,
"ip_vs_nat_xmit_v6(): frag needed for");
- goto tx_error;
+ goto tx_error_put;
}
/* copy-on-write the packet before mangling it */
if (skb_cow(skb, rt->dst.dev->hard_header_len))
goto tx_error_put;
- /* drop old route */
- skb_dst_drop(skb);
- skb_dst_set(skb, &rt->dst);
-
/* mangle the packet */
if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp))
goto tx_error;
- ipv6_hdr(skb)->daddr = cp->daddr.in6;
+ ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &cp->daddr.in6);
- IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
+ if (!local || !skb->dev) {
+ /* drop the old route when skb is not shared */
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ } else {
+ /* destined to loopback, do we need to change route? */
+ dst_release(&rt->dst);
+ }
- ip_vs_update_conntrack(skb, cp, 1);
+ IP_VS_DBG_PKT(10, AF_INET6, pp, skb, 0, "After DNAT");
/* FIXME: when application helper enlarges the packet and the length
is larger than the MTU of outgoing device, there will be still
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(NFPROTO_IPV6, skb, rt);
+ IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local);
LeaveFunction(10);
return NF_STOLEN;
struct iphdr *old_iph = ip_hdr(skb);
u8 tos = old_iph->tos;
__be16 df = old_iph->frag_off;
- sk_buff_data_t old_transport_header = skb->transport_header;
struct iphdr *iph; /* Our new IP header */
unsigned int max_headroom; /* The extra header space needed */
int mtu;
+ int ret;
EnterFunction(10);
- if (skb->protocol != htons(ETH_P_IP)) {
- IP_VS_DBG_RL("%s(): protocol error, "
- "ETH_P_IP: %d, skb protocol: %d\n",
- __func__, htons(ETH_P_IP), skb->protocol);
- goto tx_error;
- }
-
- if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(tos))))
+ if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip,
+ RT_TOS(tos), 1|2)))
goto tx_error_icmp;
+ if (rt->rt_flags & RTCF_LOCAL) {
+ ip_rt_put(rt);
+ IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1);
+ }
tdev = rt->dst.dev;
mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
if (mtu < 68) {
- ip_rt_put(rt);
IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__);
- goto tx_error;
+ goto tx_error_put;
}
if (skb_dst(skb))
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
if ((old_iph->frag_off & htons(IP_DF))
&& mtu < ntohs(old_iph->tot_len)) {
icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
- ip_rt_put(rt);
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
- goto tx_error;
+ goto tx_error_put;
}
/*
old_iph = ip_hdr(skb);
}
- skb->transport_header = old_transport_header;
+ skb->transport_header = skb->network_header;
/* fix old IP header checksum */
ip_send_check(old_iph);
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- ip_local_out(skb);
+ ret = IP_VS_XMIT_TUNNEL(skb, cp);
+ if (ret == NF_ACCEPT)
+ ip_local_out(skb);
+ else if (ret == NF_DROP)
+ kfree_skb(skb);
LeaveFunction(10);
kfree_skb(skb);
LeaveFunction(10);
return NF_STOLEN;
+tx_error_put:
+ ip_rt_put(rt);
+ goto tx_error;
}
#ifdef CONFIG_IP_VS_IPV6
struct ip_vs_protocol *pp)
{
struct rt6_info *rt; /* Route to the other host */
+ struct in6_addr saddr; /* Source for tunnel */
struct net_device *tdev; /* Device to other host */
struct ipv6hdr *old_iph = ipv6_hdr(skb);
- sk_buff_data_t old_transport_header = skb->transport_header;
struct ipv6hdr *iph; /* Our new IP header */
unsigned int max_headroom; /* The extra header space needed */
int mtu;
+ int ret;
EnterFunction(10);
- if (skb->protocol != htons(ETH_P_IPV6)) {
- IP_VS_DBG_RL("%s(): protocol error, "
- "ETH_P_IPV6: %d, skb protocol: %d\n",
- __func__, htons(ETH_P_IPV6), skb->protocol);
- goto tx_error;
- }
-
- rt = __ip_vs_get_out_rt_v6(cp);
- if (!rt)
+ if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6,
+ &saddr, 1, 1|2)))
goto tx_error_icmp;
+ if (__ip_vs_is_local_route6(rt)) {
+ dst_release(&rt->dst);
+ IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1);
+ }
tdev = rt->dst.dev;
mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr);
- /* TODO IPv6: do we need this check in IPv6? */
- if (mtu < 1280) {
- dst_release(&rt->dst);
- IP_VS_DBG_RL("%s(): mtu less than 1280\n", __func__);
- goto tx_error;
+ if (mtu < IPV6_MIN_MTU) {
+ IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__,
+ IPV6_MIN_MTU);
+ goto tx_error_put;
}
if (skb_dst(skb))
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
if (mtu < ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr)) {
+ if (!skb->dev) {
+ struct net *net = dev_net(skb_dst(skb)->dev);
+
+ skb->dev = net->loopback_dev;
+ }
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
- dst_release(&rt->dst);
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
- goto tx_error;
+ goto tx_error_put;
}
/*
old_iph = ipv6_hdr(skb);
}
- skb->transport_header = old_transport_header;
+ skb->transport_header = skb->network_header;
skb_push(skb, sizeof(struct ipv6hdr));
skb_reset_network_header(skb);
be16_add_cpu(&iph->payload_len, sizeof(*old_iph));
iph->priority = old_iph->priority;
memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl));
- iph->daddr = rt->rt6i_dst.addr;
- iph->saddr = cp->vaddr.in6; /* rt->rt6i_src.addr; */
+ ipv6_addr_copy(&iph->daddr, &cp->daddr.in6);
+ ipv6_addr_copy(&iph->saddr, &saddr);
iph->hop_limit = old_iph->hop_limit;
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- ip6_local_out(skb);
+ ret = IP_VS_XMIT_TUNNEL(skb, cp);
+ if (ret == NF_ACCEPT)
+ ip6_local_out(skb);
+ else if (ret == NF_DROP)
+ kfree_skb(skb);
LeaveFunction(10);
kfree_skb(skb);
LeaveFunction(10);
return NF_STOLEN;
+tx_error_put:
+ dst_release(&rt->dst);
+ goto tx_error;
}
#endif
EnterFunction(10);
- if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(iph->tos))))
+ if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip,
+ RT_TOS(iph->tos), 1|2)))
goto tx_error_icmp;
+ if (rt->rt_flags & RTCF_LOCAL) {
+ ip_rt_put(rt);
+ IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1);
+ }
/* MTU checking */
mtu = dst_mtu(&rt->dst);
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(NFPROTO_IPV4, skb, rt);
+ IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0);
LeaveFunction(10);
return NF_STOLEN;
EnterFunction(10);
- rt = __ip_vs_get_out_rt_v6(cp);
- if (!rt)
+ if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL,
+ 0, 1|2)))
goto tx_error_icmp;
+ if (__ip_vs_is_local_route6(rt)) {
+ dst_release(&rt->dst);
+ IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1);
+ }
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if (skb->len > mtu) {
+ if (!skb->dev) {
+ struct net *net = dev_net(skb_dst(skb)->dev);
+
+ skb->dev = net->loopback_dev;
+ }
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
dst_release(&rt->dst);
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(NFPROTO_IPV6, skb, rt);
+ IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0);
LeaveFunction(10);
return NF_STOLEN;
struct rtable *rt; /* Route to the other host */
int mtu;
int rc;
+ int local;
EnterFunction(10);
* mangle and send the packet here (only for VS/NAT)
*/
- if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(ip_hdr(skb)->tos))))
+ if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip,
+ RT_TOS(ip_hdr(skb)->tos), 1|2|4)))
goto tx_error_icmp;
+ local = rt->rt_flags & RTCF_LOCAL;
+
+ /*
+ * Avoid duplicate tuple in reply direction for NAT traffic
+ * to local address when connection is sync-ed
+ */
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+ if (cp->flags & IP_VS_CONN_F_SYNC && local) {
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
+
+ if (ct && !nf_ct_is_untracked(ct)) {
+ IP_VS_DBG(10, "%s(): "
+ "stopping DNAT to local address %pI4\n",
+ __func__, &cp->daddr.ip);
+ goto tx_error_put;
+ }
+ }
+#endif
+
+ /* From world but DNAT to loopback address? */
+ if (local && ipv4_is_loopback(rt->rt_dst) &&
+ rt_is_input_route(skb_rtable(skb))) {
+ IP_VS_DBG(1, "%s(): "
+ "stopping DNAT to loopback %pI4\n",
+ __func__, &cp->daddr.ip);
+ goto tx_error_put;
+ }
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if ((skb->len > mtu) && (ip_hdr(skb)->frag_off & htons(IP_DF))) {
- ip_rt_put(rt);
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
- goto tx_error;
+ goto tx_error_put;
}
/* copy-on-write the packet before mangling it */
if (skb_cow(skb, rt->dst.dev->hard_header_len))
goto tx_error_put;
- /* drop the old route when skb is not shared */
- skb_dst_drop(skb);
- skb_dst_set(skb, &rt->dst);
-
ip_vs_nat_icmp(skb, pp, cp, 0);
+ if (!local) {
+ /* drop the old route when skb is not shared */
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ } else {
+ ip_rt_put(rt);
+ /*
+ * Some IPv4 replies get local address from routes,
+ * not from iph, so while we DNAT after routing
+ * we need this second input/output route.
+ */
+ if (!__ip_vs_reroute_locally(skb))
+ goto tx_error;
+ }
+
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(NFPROTO_IPV4, skb, rt);
+ IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local);
rc = NF_STOLEN;
goto out;
struct rt6_info *rt; /* Route to the other host */
int mtu;
int rc;
+ int local;
EnterFunction(10);
* mangle and send the packet here (only for VS/NAT)
*/
- rt = __ip_vs_get_out_rt_v6(cp);
- if (!rt)
+ if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL,
+ 0, 1|2|4)))
goto tx_error_icmp;
+ local = __ip_vs_is_local_route6(rt);
+ /*
+ * Avoid duplicate tuple in reply direction for NAT traffic
+ * to local address when connection is sync-ed
+ */
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+ if (cp->flags & IP_VS_CONN_F_SYNC && local) {
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
+
+ if (ct && !nf_ct_is_untracked(ct)) {
+ IP_VS_DBG(10, "%s(): "
+ "stopping DNAT to local address %pI6\n",
+ __func__, &cp->daddr.in6);
+ goto tx_error_put;
+ }
+ }
+#endif
+
+ /* From world but DNAT to loopback address? */
+ if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) &&
+ ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) {
+ IP_VS_DBG(1, "%s(): "
+ "stopping DNAT to loopback %pI6\n",
+ __func__, &cp->daddr.in6);
+ goto tx_error_put;
+ }
+
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if (skb->len > mtu) {
- dst_release(&rt->dst);
+ if (!skb->dev) {
+ struct net *net = dev_net(skb_dst(skb)->dev);
+
+ skb->dev = net->loopback_dev;
+ }
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
- goto tx_error;
+ goto tx_error_put;
}
/* copy-on-write the packet before mangling it */
if (skb_cow(skb, rt->dst.dev->hard_header_len))
goto tx_error_put;
- /* drop the old route when skb is not shared */
- skb_dst_drop(skb);
- skb_dst_set(skb, &rt->dst);
-
ip_vs_nat_icmp_v6(skb, pp, cp, 0);
+ if (!local || !skb->dev) {
+ /* drop the old route when skb is not shared */
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ } else {
+ /* destined to loopback, do we need to change route? */
+ dst_release(&rt->dst);
+ }
+
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(NFPROTO_IPV6, skb, rt);
+ IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local);
rc = NF_STOLEN;
goto out;
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff