1267 lines
32 KiB
C
1267 lines
32 KiB
C
/*
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* ip_vs_xmit.c: various packet transmitters for IPVS
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*
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* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
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* Julian Anastasov <ja@ssi.bg>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Changes:
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*
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* Description of forwarding methods:
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* - all transmitters are called from LOCAL_IN (remote clients) and
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* LOCAL_OUT (local clients) but for ICMP can be called from FORWARD
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* - not all connections have destination server, for example,
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* connections in backup server when fwmark is used
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* - bypass connections use daddr from packet
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* - we can use dst without ref while sending in RCU section, we use
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* ref when returning NF_ACCEPT for NAT-ed packet via loopback
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* LOCAL_OUT rules:
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* - skb->dev is NULL, skb->protocol is not set (both are set in POST_ROUTING)
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* - skb->pkt_type is not set yet
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* - the only place where we can see skb->sk != NULL
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*/
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#define KMSG_COMPONENT "IPVS"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/tcp.h> /* for tcphdr */
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#include <net/ip.h>
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#include <net/tcp.h> /* for csum_tcpudp_magic */
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#include <net/udp.h>
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#include <net/icmp.h> /* for icmp_send */
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#include <net/route.h> /* for ip_route_output */
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <linux/icmpv6.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4.h>
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#include <net/ip_vs.h>
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enum {
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IP_VS_RT_MODE_LOCAL = 1, /* Allow local dest */
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IP_VS_RT_MODE_NON_LOCAL = 2, /* Allow non-local dest */
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IP_VS_RT_MODE_RDR = 4, /* Allow redirect from remote daddr to
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* local
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*/
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IP_VS_RT_MODE_CONNECT = 8, /* Always bind route to saddr */
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IP_VS_RT_MODE_KNOWN_NH = 16,/* Route via remote addr */
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IP_VS_RT_MODE_TUNNEL = 32,/* Tunnel mode */
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};
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static inline struct ip_vs_dest_dst *ip_vs_dest_dst_alloc(void)
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{
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return kmalloc(sizeof(struct ip_vs_dest_dst), GFP_ATOMIC);
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}
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static inline void ip_vs_dest_dst_free(struct ip_vs_dest_dst *dest_dst)
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{
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kfree(dest_dst);
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}
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/*
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* Destination cache to speed up outgoing route lookup
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*/
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static inline void
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__ip_vs_dst_set(struct ip_vs_dest *dest, struct ip_vs_dest_dst *dest_dst,
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struct dst_entry *dst, u32 dst_cookie)
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{
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struct ip_vs_dest_dst *old;
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old = rcu_dereference_protected(dest->dest_dst,
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lockdep_is_held(&dest->dst_lock));
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if (dest_dst) {
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dest_dst->dst_cache = dst;
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dest_dst->dst_cookie = dst_cookie;
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}
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rcu_assign_pointer(dest->dest_dst, dest_dst);
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if (old)
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call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
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}
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static inline struct ip_vs_dest_dst *
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__ip_vs_dst_check(struct ip_vs_dest *dest)
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{
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struct ip_vs_dest_dst *dest_dst = rcu_dereference(dest->dest_dst);
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struct dst_entry *dst;
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if (!dest_dst)
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return NULL;
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dst = dest_dst->dst_cache;
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if (dst->obsolete &&
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dst->ops->check(dst, dest_dst->dst_cookie) == NULL)
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return NULL;
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return dest_dst;
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}
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static inline bool
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__mtu_check_toobig_v6(const struct sk_buff *skb, u32 mtu)
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{
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if (IP6CB(skb)->frag_max_size) {
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/* frag_max_size tell us that, this packet have been
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* defragmented by netfilter IPv6 conntrack module.
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*/
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if (IP6CB(skb)->frag_max_size > mtu)
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return true; /* largest fragment violate MTU */
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}
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else if (skb->len > mtu && !skb_is_gso(skb)) {
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return true; /* Packet size violate MTU size */
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}
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return false;
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}
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/* Get route to daddr, update *saddr, optionally bind route to saddr */
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static struct rtable *do_output_route4(struct net *net, __be32 daddr,
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int rt_mode, __be32 *saddr)
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{
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struct flowi4 fl4;
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struct rtable *rt;
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int loop = 0;
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memset(&fl4, 0, sizeof(fl4));
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fl4.daddr = daddr;
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fl4.saddr = (rt_mode & IP_VS_RT_MODE_CONNECT) ? *saddr : 0;
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fl4.flowi4_flags = (rt_mode & IP_VS_RT_MODE_KNOWN_NH) ?
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FLOWI_FLAG_KNOWN_NH : 0;
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retry:
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rt = ip_route_output_key(net, &fl4);
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if (IS_ERR(rt)) {
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/* Invalid saddr ? */
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if (PTR_ERR(rt) == -EINVAL && *saddr &&
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rt_mode & IP_VS_RT_MODE_CONNECT && !loop) {
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*saddr = 0;
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flowi4_update_output(&fl4, 0, 0, daddr, 0);
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goto retry;
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}
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IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", &daddr);
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return NULL;
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} else if (!*saddr && rt_mode & IP_VS_RT_MODE_CONNECT && fl4.saddr) {
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ip_rt_put(rt);
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*saddr = fl4.saddr;
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flowi4_update_output(&fl4, 0, 0, daddr, fl4.saddr);
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loop++;
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goto retry;
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}
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*saddr = fl4.saddr;
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return rt;
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}
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/* Get route to destination or remote server */
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static int
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__ip_vs_get_out_rt(struct sk_buff *skb, struct ip_vs_dest *dest,
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__be32 daddr, int rt_mode, __be32 *ret_saddr)
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{
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struct net *net = dev_net(skb_dst(skb)->dev);
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struct netns_ipvs *ipvs = net_ipvs(net);
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struct ip_vs_dest_dst *dest_dst;
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struct rtable *rt; /* Route to the other host */
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struct rtable *ort; /* Original route */
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struct iphdr *iph;
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__be16 df;
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int mtu;
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int local, noref = 1;
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if (dest) {
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dest_dst = __ip_vs_dst_check(dest);
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if (likely(dest_dst))
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rt = (struct rtable *) dest_dst->dst_cache;
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else {
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dest_dst = ip_vs_dest_dst_alloc();
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spin_lock_bh(&dest->dst_lock);
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if (!dest_dst) {
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__ip_vs_dst_set(dest, NULL, NULL, 0);
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spin_unlock_bh(&dest->dst_lock);
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goto err_unreach;
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}
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rt = do_output_route4(net, dest->addr.ip, rt_mode,
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&dest_dst->dst_saddr.ip);
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if (!rt) {
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__ip_vs_dst_set(dest, NULL, NULL, 0);
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spin_unlock_bh(&dest->dst_lock);
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ip_vs_dest_dst_free(dest_dst);
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goto err_unreach;
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}
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__ip_vs_dst_set(dest, dest_dst, &rt->dst, 0);
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spin_unlock_bh(&dest->dst_lock);
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IP_VS_DBG(10, "new dst %pI4, src %pI4, refcnt=%d\n",
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&dest->addr.ip, &dest_dst->dst_saddr.ip,
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atomic_read(&rt->dst.__refcnt));
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}
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daddr = dest->addr.ip;
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if (ret_saddr)
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*ret_saddr = dest_dst->dst_saddr.ip;
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} else {
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__be32 saddr = htonl(INADDR_ANY);
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noref = 0;
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/* For such unconfigured boxes avoid many route lookups
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* for performance reasons because we do not remember saddr
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*/
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rt_mode &= ~IP_VS_RT_MODE_CONNECT;
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rt = do_output_route4(net, daddr, rt_mode, &saddr);
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if (!rt)
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goto err_unreach;
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if (ret_saddr)
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*ret_saddr = saddr;
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}
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local = (rt->rt_flags & RTCF_LOCAL) ? 1 : 0;
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if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) &
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rt_mode)) {
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IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI4\n",
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(rt->rt_flags & RTCF_LOCAL) ?
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"local":"non-local", &daddr);
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goto err_put;
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}
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iph = ip_hdr(skb);
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if (likely(!local)) {
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if (unlikely(ipv4_is_loopback(iph->saddr))) {
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IP_VS_DBG_RL("Stopping traffic from loopback address "
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"%pI4 to non-local address, dest: %pI4\n",
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&iph->saddr, &daddr);
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goto err_put;
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}
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} else {
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ort = skb_rtable(skb);
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if (!(rt_mode & IP_VS_RT_MODE_RDR) &&
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!(ort->rt_flags & RTCF_LOCAL)) {
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IP_VS_DBG_RL("Redirect from non-local address %pI4 to "
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"local requires NAT method, dest: %pI4\n",
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&iph->daddr, &daddr);
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goto err_put;
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}
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/* skb to local stack, preserve old route */
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if (!noref)
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ip_rt_put(rt);
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return local;
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}
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if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL))) {
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mtu = dst_mtu(&rt->dst);
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df = iph->frag_off & htons(IP_DF);
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} else {
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struct sock *sk = skb->sk;
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mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
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if (mtu < 68) {
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IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__);
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goto err_put;
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}
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ort = skb_rtable(skb);
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if (!skb->dev && sk && sk->sk_state != TCP_TIME_WAIT)
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ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu);
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/* MTU check allowed? */
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df = sysctl_pmtu_disc(ipvs) ? iph->frag_off & htons(IP_DF) : 0;
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}
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/* MTU checking */
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if (unlikely(df && skb->len > mtu && !skb_is_gso(skb))) {
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icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
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IP_VS_DBG(1, "frag needed for %pI4\n", &iph->saddr);
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goto err_put;
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}
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skb_dst_drop(skb);
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if (noref) {
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if (!local)
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skb_dst_set_noref_force(skb, &rt->dst);
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else
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skb_dst_set(skb, dst_clone(&rt->dst));
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} else
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skb_dst_set(skb, &rt->dst);
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return local;
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err_put:
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if (!noref)
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ip_rt_put(rt);
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return -1;
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err_unreach:
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dst_link_failure(skb);
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return -1;
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}
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#ifdef CONFIG_IP_VS_IPV6
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static inline int __ip_vs_is_local_route6(struct rt6_info *rt)
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{
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return rt->dst.dev && rt->dst.dev->flags & IFF_LOOPBACK;
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}
|
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|
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static struct dst_entry *
|
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__ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr,
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struct in6_addr *ret_saddr, int do_xfrm)
|
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{
|
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struct dst_entry *dst;
|
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struct flowi6 fl6 = {
|
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.daddr = *daddr,
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};
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|
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dst = ip6_route_output(net, NULL, &fl6);
|
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if (dst->error)
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goto out_err;
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if (!ret_saddr)
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return dst;
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if (ipv6_addr_any(&fl6.saddr) &&
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ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
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&fl6.daddr, 0, &fl6.saddr) < 0)
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goto out_err;
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if (do_xfrm) {
|
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dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
|
|
if (IS_ERR(dst)) {
|
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dst = NULL;
|
|
goto out_err;
|
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}
|
|
}
|
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*ret_saddr = fl6.saddr;
|
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return dst;
|
|
|
|
out_err:
|
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dst_release(dst);
|
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IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr);
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|
return NULL;
|
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}
|
|
|
|
/*
|
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* Get route to destination or remote server
|
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*/
|
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static int
|
|
__ip_vs_get_out_rt_v6(struct sk_buff *skb, struct ip_vs_dest *dest,
|
|
struct in6_addr *daddr, struct in6_addr *ret_saddr,
|
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struct ip_vs_iphdr *ipvsh, int do_xfrm, int rt_mode)
|
|
{
|
|
struct net *net = dev_net(skb_dst(skb)->dev);
|
|
struct ip_vs_dest_dst *dest_dst;
|
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struct rt6_info *rt; /* Route to the other host */
|
|
struct rt6_info *ort; /* Original route */
|
|
struct dst_entry *dst;
|
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int mtu;
|
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int local, noref = 1;
|
|
|
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if (dest) {
|
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dest_dst = __ip_vs_dst_check(dest);
|
|
if (likely(dest_dst))
|
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rt = (struct rt6_info *) dest_dst->dst_cache;
|
|
else {
|
|
u32 cookie;
|
|
|
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dest_dst = ip_vs_dest_dst_alloc();
|
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spin_lock_bh(&dest->dst_lock);
|
|
if (!dest_dst) {
|
|
__ip_vs_dst_set(dest, NULL, NULL, 0);
|
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spin_unlock_bh(&dest->dst_lock);
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|
goto err_unreach;
|
|
}
|
|
dst = __ip_vs_route_output_v6(net, &dest->addr.in6,
|
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&dest_dst->dst_saddr.in6,
|
|
do_xfrm);
|
|
if (!dst) {
|
|
__ip_vs_dst_set(dest, NULL, NULL, 0);
|
|
spin_unlock_bh(&dest->dst_lock);
|
|
ip_vs_dest_dst_free(dest_dst);
|
|
goto err_unreach;
|
|
}
|
|
rt = (struct rt6_info *) dst;
|
|
cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
|
|
__ip_vs_dst_set(dest, dest_dst, &rt->dst, cookie);
|
|
spin_unlock_bh(&dest->dst_lock);
|
|
IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n",
|
|
&dest->addr.in6, &dest_dst->dst_saddr.in6,
|
|
atomic_read(&rt->dst.__refcnt));
|
|
}
|
|
if (ret_saddr)
|
|
*ret_saddr = dest_dst->dst_saddr.in6;
|
|
} else {
|
|
noref = 0;
|
|
dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm);
|
|
if (!dst)
|
|
goto err_unreach;
|
|
rt = (struct rt6_info *) dst;
|
|
}
|
|
|
|
local = __ip_vs_is_local_route6(rt);
|
|
if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) &
|
|
rt_mode)) {
|
|
IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI6c\n",
|
|
local ? "local":"non-local", daddr);
|
|
goto err_put;
|
|
}
|
|
if (likely(!local)) {
|
|
if (unlikely((!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 "
|
|
"%pI6c to non-local address, "
|
|
"dest: %pI6c\n",
|
|
&ipv6_hdr(skb)->saddr, daddr);
|
|
goto err_put;
|
|
}
|
|
} else {
|
|
ort = (struct rt6_info *) skb_dst(skb);
|
|
if (!(rt_mode & IP_VS_RT_MODE_RDR) &&
|
|
!__ip_vs_is_local_route6(ort)) {
|
|
IP_VS_DBG_RL("Redirect from non-local address %pI6c "
|
|
"to local requires NAT method, "
|
|
"dest: %pI6c\n",
|
|
&ipv6_hdr(skb)->daddr, daddr);
|
|
goto err_put;
|
|
}
|
|
/* skb to local stack, preserve old route */
|
|
if (!noref)
|
|
dst_release(&rt->dst);
|
|
return local;
|
|
}
|
|
|
|
/* MTU checking */
|
|
if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL)))
|
|
mtu = dst_mtu(&rt->dst);
|
|
else {
|
|
struct sock *sk = skb->sk;
|
|
|
|
mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr);
|
|
if (mtu < IPV6_MIN_MTU) {
|
|
IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__,
|
|
IPV6_MIN_MTU);
|
|
goto err_put;
|
|
}
|
|
ort = (struct rt6_info *) skb_dst(skb);
|
|
if (!skb->dev && sk && sk->sk_state != TCP_TIME_WAIT)
|
|
ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu);
|
|
}
|
|
|
|
if (unlikely(__mtu_check_toobig_v6(skb, mtu))) {
|
|
if (!skb->dev)
|
|
skb->dev = net->loopback_dev;
|
|
/* only send ICMP too big on first fragment */
|
|
if (!ipvsh->fragoffs)
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
IP_VS_DBG(1, "frag needed for %pI6c\n", &ipv6_hdr(skb)->saddr);
|
|
goto err_put;
|
|
}
|
|
|
|
skb_dst_drop(skb);
|
|
if (noref) {
|
|
if (!local)
|
|
skb_dst_set_noref_force(skb, &rt->dst);
|
|
else
|
|
skb_dst_set(skb, dst_clone(&rt->dst));
|
|
} else
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
return local;
|
|
|
|
err_put:
|
|
if (!noref)
|
|
dst_release(&rt->dst);
|
|
return -1;
|
|
|
|
err_unreach:
|
|
dst_link_failure(skb);
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
|
|
/* return NF_ACCEPT to allow forwarding or other NF_xxx on error */
|
|
static inline int ip_vs_tunnel_xmit_prepare(struct sk_buff *skb,
|
|
struct ip_vs_conn *cp)
|
|
{
|
|
int ret = NF_ACCEPT;
|
|
|
|
skb->ipvs_property = 1;
|
|
if (unlikely(cp->flags & IP_VS_CONN_F_NFCT))
|
|
ret = ip_vs_confirm_conntrack(skb);
|
|
if (ret == NF_ACCEPT) {
|
|
nf_reset(skb);
|
|
skb_forward_csum(skb);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* return NF_STOLEN (sent) or NF_ACCEPT if local=1 (not sent) */
|
|
static inline int ip_vs_nat_send_or_cont(int pf, struct sk_buff *skb,
|
|
struct ip_vs_conn *cp, int local)
|
|
{
|
|
int ret = NF_STOLEN;
|
|
|
|
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) {
|
|
skb_forward_csum(skb);
|
|
NF_HOOK(pf, NF_INET_LOCAL_OUT, skb, NULL, skb_dst(skb)->dev,
|
|
dst_output);
|
|
} else
|
|
ret = NF_ACCEPT;
|
|
return ret;
|
|
}
|
|
|
|
/* return NF_STOLEN (sent) or NF_ACCEPT if local=1 (not sent) */
|
|
static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb,
|
|
struct ip_vs_conn *cp, int local)
|
|
{
|
|
int ret = NF_STOLEN;
|
|
|
|
skb->ipvs_property = 1;
|
|
if (likely(!(cp->flags & IP_VS_CONN_F_NFCT)))
|
|
ip_vs_notrack(skb);
|
|
if (!local) {
|
|
skb_forward_csum(skb);
|
|
NF_HOOK(pf, NF_INET_LOCAL_OUT, skb, NULL, skb_dst(skb)->dev,
|
|
dst_output);
|
|
} else
|
|
ret = NF_ACCEPT;
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* NULL transmitter (do nothing except return NF_ACCEPT)
|
|
*/
|
|
int
|
|
ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
/* we do not touch skb and do not need pskb ptr */
|
|
return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1);
|
|
}
|
|
|
|
|
|
/*
|
|
* Bypass transmitter
|
|
* Let packets bypass the destination when the destination is not
|
|
* available, it may be only used in transparent cache cluster.
|
|
*/
|
|
int
|
|
ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
|
|
EnterFunction(10);
|
|
|
|
rcu_read_lock();
|
|
if (__ip_vs_get_out_rt(skb, NULL, iph->daddr, IP_VS_RT_MODE_NON_LOCAL,
|
|
NULL) < 0)
|
|
goto tx_error;
|
|
|
|
ip_send_check(iph);
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0);
|
|
rcu_read_unlock();
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
int
|
|
ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
EnterFunction(10);
|
|
|
|
rcu_read_lock();
|
|
if (__ip_vs_get_out_rt_v6(skb, NULL, &ipvsh->daddr.in6, NULL,
|
|
ipvsh, 0, IP_VS_RT_MODE_NON_LOCAL) < 0)
|
|
goto tx_error;
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0);
|
|
rcu_read_unlock();
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* NAT transmitter (only for outside-to-inside nat forwarding)
|
|
* Not used for related ICMP
|
|
*/
|
|
int
|
|
ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
struct rtable *rt; /* Route to the other host */
|
|
int local, rc, was_input;
|
|
|
|
EnterFunction(10);
|
|
|
|
rcu_read_lock();
|
|
/* check if it is a connection of no-client-port */
|
|
if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) {
|
|
__be16 _pt, *p;
|
|
|
|
p = skb_header_pointer(skb, ipvsh->len, sizeof(_pt), &_pt);
|
|
if (p == NULL)
|
|
goto tx_error;
|
|
ip_vs_conn_fill_cport(cp, *p);
|
|
IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p));
|
|
}
|
|
|
|
was_input = rt_is_input_route(skb_rtable(skb));
|
|
local = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip,
|
|
IP_VS_RT_MODE_LOCAL |
|
|
IP_VS_RT_MODE_NON_LOCAL |
|
|
IP_VS_RT_MODE_RDR, NULL);
|
|
if (local < 0)
|
|
goto tx_error;
|
|
rt = skb_rtable(skb);
|
|
/*
|
|
* Avoid duplicate tuple in reply direction for NAT traffic
|
|
* to local address when connection is sync-ed
|
|
*/
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
if (cp->flags & IP_VS_CONN_F_SYNC && local) {
|
|
enum ip_conntrack_info ctinfo;
|
|
struct nf_conn *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;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* From world but DNAT to loopback address? */
|
|
if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) {
|
|
IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): "
|
|
"stopping DNAT to loopback address");
|
|
goto tx_error;
|
|
}
|
|
|
|
/* copy-on-write the packet before mangling it */
|
|
if (!skb_make_writable(skb, sizeof(struct iphdr)))
|
|
goto tx_error;
|
|
|
|
if (skb_cow(skb, rt->dst.dev->hard_header_len))
|
|
goto tx_error;
|
|
|
|
/* mangle the packet */
|
|
if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp, ipvsh))
|
|
goto tx_error;
|
|
ip_hdr(skb)->daddr = cp->daddr.ip;
|
|
ip_send_check(ip_hdr(skb));
|
|
|
|
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
|
|
MTU problem. */
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local);
|
|
rcu_read_unlock();
|
|
|
|
LeaveFunction(10);
|
|
return rc;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
int
|
|
ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
struct rt6_info *rt; /* Route to the other host */
|
|
int local, rc;
|
|
|
|
EnterFunction(10);
|
|
|
|
rcu_read_lock();
|
|
/* check if it is a connection of no-client-port */
|
|
if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT && !ipvsh->fragoffs)) {
|
|
__be16 _pt, *p;
|
|
p = skb_header_pointer(skb, ipvsh->len, sizeof(_pt), &_pt);
|
|
if (p == NULL)
|
|
goto tx_error;
|
|
ip_vs_conn_fill_cport(cp, *p);
|
|
IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p));
|
|
}
|
|
|
|
local = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL,
|
|
ipvsh, 0,
|
|
IP_VS_RT_MODE_LOCAL |
|
|
IP_VS_RT_MODE_NON_LOCAL |
|
|
IP_VS_RT_MODE_RDR);
|
|
if (local < 0)
|
|
goto tx_error;
|
|
rt = (struct rt6_info *) skb_dst(skb);
|
|
/*
|
|
* Avoid duplicate tuple in reply direction for NAT traffic
|
|
* to local address when connection is sync-ed
|
|
*/
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
if (cp->flags & IP_VS_CONN_F_SYNC && local) {
|
|
enum ip_conntrack_info ctinfo;
|
|
struct nf_conn *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;
|
|
}
|
|
}
|
|
#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;
|
|
}
|
|
|
|
/* copy-on-write the packet before mangling it */
|
|
if (!skb_make_writable(skb, sizeof(struct ipv6hdr)))
|
|
goto tx_error;
|
|
|
|
if (skb_cow(skb, rt->dst.dev->hard_header_len))
|
|
goto tx_error;
|
|
|
|
/* mangle the packet */
|
|
if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp, ipvsh))
|
|
goto tx_error;
|
|
ipv6_hdr(skb)->daddr = cp->daddr.in6;
|
|
|
|
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
|
|
MTU problem. */
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local);
|
|
rcu_read_unlock();
|
|
|
|
LeaveFunction(10);
|
|
return rc;
|
|
|
|
tx_error:
|
|
LeaveFunction(10);
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
return NF_STOLEN;
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* IP Tunneling transmitter
|
|
*
|
|
* This function encapsulates the packet in a new IP packet, its
|
|
* destination will be set to cp->daddr. Most code of this function
|
|
* is taken from ipip.c.
|
|
*
|
|
* It is used in VS/TUN cluster. The load balancer selects a real
|
|
* server from a cluster based on a scheduling algorithm,
|
|
* encapsulates the request packet and forwards it to the selected
|
|
* server. For example, all real servers are configured with
|
|
* "ifconfig tunl0 <Virtual IP Address> up". When the server receives
|
|
* the encapsulated packet, it will decapsulate the packet, processe
|
|
* the request and return the response packets directly to the client
|
|
* without passing the load balancer. This can greatly increase the
|
|
* scalability of virtual server.
|
|
*
|
|
* Used for ANY protocol
|
|
*/
|
|
int
|
|
ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
struct netns_ipvs *ipvs = net_ipvs(skb_net(skb));
|
|
struct rtable *rt; /* Route to the other host */
|
|
__be32 saddr; /* Source for tunnel */
|
|
struct net_device *tdev; /* Device to other host */
|
|
struct iphdr *old_iph = ip_hdr(skb);
|
|
u8 tos = old_iph->tos;
|
|
__be16 df;
|
|
struct iphdr *iph; /* Our new IP header */
|
|
unsigned int max_headroom; /* The extra header space needed */
|
|
int ret, local;
|
|
|
|
EnterFunction(10);
|
|
|
|
rcu_read_lock();
|
|
local = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip,
|
|
IP_VS_RT_MODE_LOCAL |
|
|
IP_VS_RT_MODE_NON_LOCAL |
|
|
IP_VS_RT_MODE_CONNECT |
|
|
IP_VS_RT_MODE_TUNNEL, &saddr);
|
|
if (local < 0)
|
|
goto tx_error;
|
|
if (local) {
|
|
rcu_read_unlock();
|
|
return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1);
|
|
}
|
|
|
|
rt = skb_rtable(skb);
|
|
tdev = rt->dst.dev;
|
|
|
|
/* Copy DF, reset fragment offset and MF */
|
|
df = sysctl_pmtu_disc(ipvs) ? old_iph->frag_off & htons(IP_DF) : 0;
|
|
|
|
/*
|
|
* Okay, now see if we can stuff it in the buffer as-is.
|
|
*/
|
|
max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr);
|
|
|
|
if (skb_headroom(skb) < max_headroom || skb_cloned(skb)) {
|
|
struct sk_buff *new_skb =
|
|
skb_realloc_headroom(skb, max_headroom);
|
|
|
|
if (!new_skb)
|
|
goto tx_error;
|
|
consume_skb(skb);
|
|
skb = new_skb;
|
|
old_iph = ip_hdr(skb);
|
|
}
|
|
|
|
skb->transport_header = skb->network_header;
|
|
|
|
/* fix old IP header checksum */
|
|
ip_send_check(old_iph);
|
|
|
|
skb_push(skb, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb);
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
|
|
|
/*
|
|
* Push down and install the IPIP header.
|
|
*/
|
|
iph = ip_hdr(skb);
|
|
iph->version = 4;
|
|
iph->ihl = sizeof(struct iphdr)>>2;
|
|
iph->frag_off = df;
|
|
iph->protocol = IPPROTO_IPIP;
|
|
iph->tos = tos;
|
|
iph->daddr = cp->daddr.ip;
|
|
iph->saddr = saddr;
|
|
iph->ttl = old_iph->ttl;
|
|
ip_select_ident(skb, &rt->dst, NULL);
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
ret = ip_vs_tunnel_xmit_prepare(skb, cp);
|
|
if (ret == NF_ACCEPT)
|
|
ip_local_out(skb);
|
|
else if (ret == NF_DROP)
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
|
|
LeaveFunction(10);
|
|
|
|
return NF_STOLEN;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
int
|
|
ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
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);
|
|
struct ipv6hdr *iph; /* Our new IP header */
|
|
unsigned int max_headroom; /* The extra header space needed */
|
|
int ret, local;
|
|
|
|
EnterFunction(10);
|
|
|
|
rcu_read_lock();
|
|
local = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6,
|
|
&saddr, ipvsh, 1,
|
|
IP_VS_RT_MODE_LOCAL |
|
|
IP_VS_RT_MODE_NON_LOCAL |
|
|
IP_VS_RT_MODE_TUNNEL);
|
|
if (local < 0)
|
|
goto tx_error;
|
|
if (local) {
|
|
rcu_read_unlock();
|
|
return ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 1);
|
|
}
|
|
|
|
rt = (struct rt6_info *) skb_dst(skb);
|
|
tdev = rt->dst.dev;
|
|
|
|
/*
|
|
* Okay, now see if we can stuff it in the buffer as-is.
|
|
*/
|
|
max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr);
|
|
|
|
if (skb_headroom(skb) < max_headroom || skb_cloned(skb)) {
|
|
struct sk_buff *new_skb =
|
|
skb_realloc_headroom(skb, max_headroom);
|
|
|
|
if (!new_skb)
|
|
goto tx_error;
|
|
consume_skb(skb);
|
|
skb = new_skb;
|
|
old_iph = ipv6_hdr(skb);
|
|
}
|
|
|
|
skb->transport_header = skb->network_header;
|
|
|
|
skb_push(skb, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb);
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
|
|
|
/*
|
|
* Push down and install the IPIP header.
|
|
*/
|
|
iph = ipv6_hdr(skb);
|
|
iph->version = 6;
|
|
iph->nexthdr = IPPROTO_IPV6;
|
|
iph->payload_len = old_iph->payload_len;
|
|
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 = cp->daddr.in6;
|
|
iph->saddr = saddr;
|
|
iph->hop_limit = old_iph->hop_limit;
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
ret = ip_vs_tunnel_xmit_prepare(skb, cp);
|
|
if (ret == NF_ACCEPT)
|
|
ip6_local_out(skb);
|
|
else if (ret == NF_DROP)
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
|
|
LeaveFunction(10);
|
|
|
|
return NF_STOLEN;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Direct Routing transmitter
|
|
* Used for ANY protocol
|
|
*/
|
|
int
|
|
ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
int local;
|
|
|
|
EnterFunction(10);
|
|
|
|
rcu_read_lock();
|
|
local = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip,
|
|
IP_VS_RT_MODE_LOCAL |
|
|
IP_VS_RT_MODE_NON_LOCAL |
|
|
IP_VS_RT_MODE_KNOWN_NH, NULL);
|
|
if (local < 0)
|
|
goto tx_error;
|
|
if (local) {
|
|
rcu_read_unlock();
|
|
return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1);
|
|
}
|
|
|
|
ip_send_check(ip_hdr(skb));
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0);
|
|
rcu_read_unlock();
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
int
|
|
ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
int local;
|
|
|
|
EnterFunction(10);
|
|
|
|
rcu_read_lock();
|
|
local = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL,
|
|
ipvsh, 0,
|
|
IP_VS_RT_MODE_LOCAL |
|
|
IP_VS_RT_MODE_NON_LOCAL);
|
|
if (local < 0)
|
|
goto tx_error;
|
|
if (local) {
|
|
rcu_read_unlock();
|
|
return ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 1);
|
|
}
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0);
|
|
rcu_read_unlock();
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* ICMP packet transmitter
|
|
* called by the ip_vs_in_icmp
|
|
*/
|
|
int
|
|
ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, int offset, unsigned int hooknum,
|
|
struct ip_vs_iphdr *iph)
|
|
{
|
|
struct rtable *rt; /* Route to the other host */
|
|
int rc;
|
|
int local;
|
|
int rt_mode, was_input;
|
|
|
|
EnterFunction(10);
|
|
|
|
/* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be
|
|
forwarded directly here, because there is no need to
|
|
translate address/port back */
|
|
if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) {
|
|
if (cp->packet_xmit)
|
|
rc = cp->packet_xmit(skb, cp, pp, iph);
|
|
else
|
|
rc = NF_ACCEPT;
|
|
/* do not touch skb anymore */
|
|
atomic_inc(&cp->in_pkts);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* mangle and send the packet here (only for VS/NAT)
|
|
*/
|
|
was_input = rt_is_input_route(skb_rtable(skb));
|
|
|
|
/* LOCALNODE from FORWARD hook is not supported */
|
|
rt_mode = (hooknum != NF_INET_FORWARD) ?
|
|
IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL |
|
|
IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL;
|
|
rcu_read_lock();
|
|
local = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, rt_mode, NULL);
|
|
if (local < 0)
|
|
goto tx_error;
|
|
rt = skb_rtable(skb);
|
|
|
|
/*
|
|
* Avoid duplicate tuple in reply direction for NAT traffic
|
|
* to local address when connection is sync-ed
|
|
*/
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
if (cp->flags & IP_VS_CONN_F_SYNC && local) {
|
|
enum ip_conntrack_info ctinfo;
|
|
struct nf_conn *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;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* From world but DNAT to loopback address? */
|
|
if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) {
|
|
IP_VS_DBG(1, "%s(): "
|
|
"stopping DNAT to loopback %pI4\n",
|
|
__func__, &cp->daddr.ip);
|
|
goto tx_error;
|
|
}
|
|
|
|
/* copy-on-write the packet before mangling it */
|
|
if (!skb_make_writable(skb, offset))
|
|
goto tx_error;
|
|
|
|
if (skb_cow(skb, rt->dst.dev->hard_header_len))
|
|
goto tx_error;
|
|
|
|
ip_vs_nat_icmp(skb, pp, cp, 0);
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local);
|
|
rcu_read_unlock();
|
|
goto out;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
rc = NF_STOLEN;
|
|
out:
|
|
LeaveFunction(10);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
int
|
|
ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, int offset, unsigned int hooknum,
|
|
struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
struct rt6_info *rt; /* Route to the other host */
|
|
int rc;
|
|
int local;
|
|
int rt_mode;
|
|
|
|
EnterFunction(10);
|
|
|
|
/* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be
|
|
forwarded directly here, because there is no need to
|
|
translate address/port back */
|
|
if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) {
|
|
if (cp->packet_xmit)
|
|
rc = cp->packet_xmit(skb, cp, pp, ipvsh);
|
|
else
|
|
rc = NF_ACCEPT;
|
|
/* do not touch skb anymore */
|
|
atomic_inc(&cp->in_pkts);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* mangle and send the packet here (only for VS/NAT)
|
|
*/
|
|
|
|
/* LOCALNODE from FORWARD hook is not supported */
|
|
rt_mode = (hooknum != NF_INET_FORWARD) ?
|
|
IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL |
|
|
IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL;
|
|
rcu_read_lock();
|
|
local = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL,
|
|
ipvsh, 0, rt_mode);
|
|
if (local < 0)
|
|
goto tx_error;
|
|
rt = (struct rt6_info *) skb_dst(skb);
|
|
/*
|
|
* Avoid duplicate tuple in reply direction for NAT traffic
|
|
* to local address when connection is sync-ed
|
|
*/
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
if (cp->flags & IP_VS_CONN_F_SYNC && local) {
|
|
enum ip_conntrack_info ctinfo;
|
|
struct nf_conn *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;
|
|
}
|
|
}
|
|
#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;
|
|
}
|
|
|
|
/* copy-on-write the packet before mangling it */
|
|
if (!skb_make_writable(skb, offset))
|
|
goto tx_error;
|
|
|
|
if (skb_cow(skb, rt->dst.dev->hard_header_len))
|
|
goto tx_error;
|
|
|
|
ip_vs_nat_icmp_v6(skb, pp, cp, 0);
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local);
|
|
rcu_read_unlock();
|
|
goto out;
|
|
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
rc = NF_STOLEN;
|
|
out:
|
|
LeaveFunction(10);
|
|
return rc;
|
|
}
|
|
#endif
|