1329 lines
32 KiB
C
1329 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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* 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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/*
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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, u32 rtos, struct dst_entry *dst,
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u32 dst_cookie)
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{
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struct dst_entry *old_dst;
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old_dst = dest->dst_cache;
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dest->dst_cache = dst;
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dest->dst_rtos = rtos;
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dest->dst_cookie = dst_cookie;
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dst_release(old_dst);
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}
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static inline struct dst_entry *
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__ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos)
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{
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struct dst_entry *dst = dest->dst_cache;
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if (!dst)
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return NULL;
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if ((dst->obsolete || rtos != dest->dst_rtos) &&
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dst->ops->check(dst, dest->dst_cookie) == NULL) {
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dest->dst_cache = NULL;
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dst_release(dst);
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return NULL;
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}
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dst_hold(dst);
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return dst;
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}
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/*
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* Get route to destination or remote server
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* rt_mode: flags, &1=Allow local dest, &2=Allow non-local dest,
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* &4=Allow redirect from remote daddr to local
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*/
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static struct rtable *
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__ip_vs_get_out_rt(struct sk_buff *skb, struct ip_vs_dest *dest,
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__be32 daddr, u32 rtos, int rt_mode)
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{
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struct net *net = dev_net(skb_dst(skb)->dev);
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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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int local;
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if (dest) {
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spin_lock(&dest->dst_lock);
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if (!(rt = (struct rtable *)
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__ip_vs_dst_check(dest, rtos))) {
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struct flowi fl = {
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.fl4_dst = dest->addr.ip,
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.fl4_tos = rtos,
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};
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if (ip_route_output_key(net, &rt, &fl)) {
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spin_unlock(&dest->dst_lock);
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IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n",
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&dest->addr.ip);
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return NULL;
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}
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__ip_vs_dst_set(dest, rtos, dst_clone(&rt->dst), 0);
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IP_VS_DBG(10, "new dst %pI4, refcnt=%d, rtos=%X\n",
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&dest->addr.ip,
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atomic_read(&rt->dst.__refcnt), rtos);
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}
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spin_unlock(&dest->dst_lock);
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} else {
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struct flowi fl = {
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.fl4_dst = daddr,
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.fl4_tos = rtos,
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};
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if (ip_route_output_key(net, &rt, &fl)) {
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IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n",
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&daddr);
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return NULL;
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}
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}
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local = rt->rt_flags & RTCF_LOCAL;
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if (!((local ? 1 : 2) & 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", &rt->rt_dst);
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ip_rt_put(rt);
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return NULL;
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}
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if (local && !(rt_mode & 4) && !((ort = skb_rtable(skb)) &&
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ort->rt_flags & RTCF_LOCAL)) {
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IP_VS_DBG_RL("Redirect from non-local address %pI4 to local "
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"requires NAT method, dest: %pI4\n",
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&ip_hdr(skb)->daddr, &rt->rt_dst);
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ip_rt_put(rt);
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return NULL;
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}
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if (unlikely(!local && ipv4_is_loopback(ip_hdr(skb)->saddr))) {
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IP_VS_DBG_RL("Stopping traffic from loopback address %pI4 "
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"to non-local address, dest: %pI4\n",
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&ip_hdr(skb)->saddr, &rt->rt_dst);
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ip_rt_put(rt);
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return NULL;
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}
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return rt;
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}
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/* Reroute packet to local IPv4 stack after DNAT */
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static int
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__ip_vs_reroute_locally(struct sk_buff *skb)
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{
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struct rtable *rt = skb_rtable(skb);
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struct net_device *dev = rt->dst.dev;
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struct net *net = dev_net(dev);
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struct iphdr *iph = ip_hdr(skb);
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if (rt_is_input_route(rt)) {
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unsigned long orefdst = skb->_skb_refdst;
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if (ip_route_input(skb, iph->daddr, iph->saddr,
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iph->tos, skb->dev))
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return 0;
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refdst_drop(orefdst);
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} else {
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struct flowi fl = {
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.fl4_dst = iph->daddr,
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.fl4_src = iph->saddr,
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.fl4_tos = RT_TOS(iph->tos),
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.mark = skb->mark,
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};
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if (ip_route_output_key(net, &rt, &fl))
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return 0;
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if (!(rt->rt_flags & RTCF_LOCAL)) {
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ip_rt_put(rt);
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return 0;
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}
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/* Drop old route. */
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skb_dst_drop(skb);
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skb_dst_set(skb, &rt->dst);
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}
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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->rt6i_dev && rt->rt6i_dev->flags & IFF_LOOPBACK;
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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 flowi fl = {
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.fl6_dst = *daddr,
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};
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dst = ip6_route_output(net, NULL, &fl);
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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(&fl.fl6_src) &&
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ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
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&fl.fl6_dst, 0, &fl.fl6_src) < 0)
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goto out_err;
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if (do_xfrm && xfrm_lookup(net, &dst, &fl, NULL, 0) < 0)
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goto out_err;
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ipv6_addr_copy(ret_saddr, &fl.fl6_src);
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return dst;
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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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/*
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* Get route to destination or remote server
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* rt_mode: flags, &1=Allow local dest, &2=Allow non-local dest,
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* &4=Allow redirect from remote daddr to local
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*/
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static struct rt6_info *
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__ip_vs_get_out_rt_v6(struct sk_buff *skb, struct ip_vs_dest *dest,
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struct in6_addr *daddr, struct in6_addr *ret_saddr,
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int do_xfrm, int rt_mode)
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{
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struct net *net = dev_net(skb_dst(skb)->dev);
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struct rt6_info *rt; /* Route to the other host */
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struct rt6_info *ort; /* Original route */
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struct dst_entry *dst;
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int local;
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if (dest) {
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spin_lock(&dest->dst_lock);
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rt = (struct rt6_info *)__ip_vs_dst_check(dest, 0);
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if (!rt) {
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u32 cookie;
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dst = __ip_vs_route_output_v6(net, &dest->addr.in6,
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&dest->dst_saddr,
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do_xfrm);
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if (!dst) {
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spin_unlock(&dest->dst_lock);
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return NULL;
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}
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rt = (struct rt6_info *) dst;
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cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
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__ip_vs_dst_set(dest, 0, dst_clone(&rt->dst), cookie);
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IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n",
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&dest->addr.in6, &dest->dst_saddr,
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atomic_read(&rt->dst.__refcnt));
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}
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if (ret_saddr)
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ipv6_addr_copy(ret_saddr, &dest->dst_saddr);
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spin_unlock(&dest->dst_lock);
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} else {
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dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm);
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if (!dst)
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return NULL;
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rt = (struct rt6_info *) dst;
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}
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local = __ip_vs_is_local_route6(rt);
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if (!((local ? 1 : 2) & rt_mode)) {
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IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI6\n",
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local ? "local":"non-local", daddr);
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dst_release(&rt->dst);
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return NULL;
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}
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if (local && !(rt_mode & 4) &&
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!((ort = (struct rt6_info *) skb_dst(skb)) &&
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__ip_vs_is_local_route6(ort))) {
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IP_VS_DBG_RL("Redirect from non-local address %pI6 to local "
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"requires NAT method, dest: %pI6\n",
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&ipv6_hdr(skb)->daddr, daddr);
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dst_release(&rt->dst);
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return NULL;
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}
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if (unlikely(!local && (!skb->dev || skb->dev->flags & IFF_LOOPBACK) &&
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ipv6_addr_type(&ipv6_hdr(skb)->saddr) &
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IPV6_ADDR_LOOPBACK)) {
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IP_VS_DBG_RL("Stopping traffic from loopback address %pI6 "
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"to non-local address, dest: %pI6\n",
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&ipv6_hdr(skb)->saddr, daddr);
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dst_release(&rt->dst);
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return NULL;
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}
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return rt;
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}
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#endif
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/*
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* Release dest->dst_cache before a dest is removed
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*/
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void
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ip_vs_dst_reset(struct ip_vs_dest *dest)
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{
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struct dst_entry *old_dst;
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old_dst = dest->dst_cache;
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dest->dst_cache = NULL;
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dst_release(old_dst);
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}
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#define IP_VS_XMIT_TUNNEL(skb, cp) \
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({ \
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int __ret = NF_ACCEPT; \
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\
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(skb)->ipvs_property = 1; \
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if (unlikely((cp)->flags & IP_VS_CONN_F_NFCT)) \
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__ret = ip_vs_confirm_conntrack(skb, cp); \
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if (__ret == NF_ACCEPT) { \
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nf_reset(skb); \
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skb_forward_csum(skb); \
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} \
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__ret; \
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})
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#define IP_VS_XMIT_NAT(pf, skb, cp, local) \
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do { \
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(skb)->ipvs_property = 1; \
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if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \
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ip_vs_notrack(skb); \
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else \
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ip_vs_update_conntrack(skb, cp, 1); \
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if (local) \
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return NF_ACCEPT; \
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skb_forward_csum(skb); \
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NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \
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skb_dst(skb)->dev, dst_output); \
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} while (0)
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#define IP_VS_XMIT(pf, skb, cp, local) \
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do { \
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(skb)->ipvs_property = 1; \
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if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \
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ip_vs_notrack(skb); \
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if (local) \
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return NF_ACCEPT; \
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skb_forward_csum(skb); \
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NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \
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skb_dst(skb)->dev, dst_output); \
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} while (0)
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|
|
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/*
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* NULL transmitter (do nothing except return NF_ACCEPT)
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*/
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int
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ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
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struct ip_vs_protocol *pp)
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{
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/* we do not touch skb and do not need pskb ptr */
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IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1);
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}
|
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|
|
|
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/*
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* Bypass transmitter
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* Let packets bypass the destination when the destination is not
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* available, it may be only used in transparent cache cluster.
|
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*/
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int
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ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
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struct ip_vs_protocol *pp)
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{
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struct rtable *rt; /* Route to the other host */
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struct iphdr *iph = ip_hdr(skb);
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int mtu;
|
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|
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EnterFunction(10);
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if (!(rt = __ip_vs_get_out_rt(skb, NULL, iph->daddr,
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RT_TOS(iph->tos), 2)))
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goto tx_error_icmp;
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|
|
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/* MTU checking */
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mtu = dst_mtu(&rt->dst);
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if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) &&
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!skb_is_gso(skb)) {
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ip_rt_put(rt);
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icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
|
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IP_VS_DBG_RL("%s(): frag needed\n", __func__);
|
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goto tx_error;
|
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}
|
|
|
|
/*
|
|
* Call ip_send_check because we are not sure it is called
|
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* after ip_defrag. Is copy-on-write needed?
|
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*/
|
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if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) {
|
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ip_rt_put(rt);
|
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return NF_STOLEN;
|
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}
|
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ip_send_check(ip_hdr(skb));
|
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|
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/* drop old route */
|
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skb_dst_drop(skb);
|
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skb_dst_set(skb, &rt->dst);
|
|
|
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/* Another hack: avoid icmp_send in ip_fragment */
|
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skb->local_df = 1;
|
|
|
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IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0);
|
|
|
|
LeaveFunction(10);
|
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return NF_STOLEN;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
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kfree_skb(skb);
|
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LeaveFunction(10);
|
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return NF_STOLEN;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
int
|
|
ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
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struct ip_vs_protocol *pp)
|
|
{
|
|
struct rt6_info *rt; /* Route to the other host */
|
|
struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
int mtu;
|
|
|
|
EnterFunction(10);
|
|
|
|
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 && !skb_is_gso(skb)) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Call ip_send_check because we are not sure it is called
|
|
* after ip_defrag. Is copy-on-write needed?
|
|
*/
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
|
if (unlikely(skb == NULL)) {
|
|
dst_release(&rt->dst);
|
|
return NF_STOLEN;
|
|
}
|
|
|
|
/* drop old route */
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0);
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
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 rtable *rt; /* Route to the other host */
|
|
int mtu;
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
int local;
|
|
|
|
EnterFunction(10);
|
|
|
|
/* 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, iph->ihl*4, 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));
|
|
}
|
|
|
|
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)) &&
|
|
!skb_is_gso(skb)) {
|
|
icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
|
|
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_make_writable(skb, sizeof(struct iphdr)))
|
|
goto tx_error_put;
|
|
|
|
if (skb_cow(skb, rt->dst.dev->hard_header_len))
|
|
goto tx_error_put;
|
|
|
|
/* mangle the packet */
|
|
if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp))
|
|
goto tx_error_put;
|
|
ip_hdr(skb)->daddr = cp->daddr.ip;
|
|
ip_send_check(ip_hdr(skb));
|
|
|
|
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_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;
|
|
|
|
IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local);
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
tx_error_put:
|
|
ip_rt_put(rt);
|
|
goto tx_error;
|
|
}
|
|
|
|
#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 rt6_info *rt; /* Route to the other host */
|
|
int mtu;
|
|
int local;
|
|
|
|
EnterFunction(10);
|
|
|
|
/* 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, sizeof(struct ipv6hdr),
|
|
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));
|
|
}
|
|
|
|
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 && !skb_is_gso(skb)) {
|
|
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, AF_INET6, pp, skb, 0,
|
|
"ip_vs_nat_xmit_v6(): frag needed for");
|
|
goto tx_error_put;
|
|
}
|
|
|
|
/* copy-on-write the packet before mangling it */
|
|
if (!skb_make_writable(skb, sizeof(struct ipv6hdr)))
|
|
goto tx_error_put;
|
|
|
|
if (skb_cow(skb, rt->dst.dev->hard_header_len))
|
|
goto tx_error_put;
|
|
|
|
/* mangle the packet */
|
|
if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp))
|
|
goto tx_error;
|
|
ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &cp->daddr.in6);
|
|
|
|
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_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;
|
|
|
|
IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local);
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
LeaveFunction(10);
|
|
kfree_skb(skb);
|
|
return NF_STOLEN;
|
|
tx_error_put:
|
|
dst_release(&rt->dst);
|
|
goto tx_error;
|
|
}
|
|
#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 rtable *rt; /* Route to the other host */
|
|
struct net_device *tdev; /* Device to other host */
|
|
struct iphdr *old_iph = ip_hdr(skb);
|
|
u8 tos = old_iph->tos;
|
|
__be16 df = old_iph->frag_off;
|
|
struct iphdr *iph; /* Our new IP header */
|
|
unsigned int max_headroom; /* The extra header space needed */
|
|
int mtu;
|
|
int ret;
|
|
|
|
EnterFunction(10);
|
|
|
|
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_VS_DBG_RL("%s(): mtu less than 68\n", __func__);
|
|
goto tx_error_put;
|
|
}
|
|
if (skb_dst(skb))
|
|
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
|
|
|
|
df |= (old_iph->frag_off & htons(IP_DF));
|
|
|
|
if ((old_iph->frag_off & htons(IP_DF) &&
|
|
mtu < ntohs(old_iph->tot_len) && !skb_is_gso(skb))) {
|
|
icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
|
|
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
|
|
goto tx_error_put;
|
|
}
|
|
|
|
/*
|
|
* 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) || skb_shared(skb)) {
|
|
struct sk_buff *new_skb =
|
|
skb_realloc_headroom(skb, max_headroom);
|
|
if (!new_skb) {
|
|
ip_rt_put(rt);
|
|
kfree_skb(skb);
|
|
IP_VS_ERR_RL("%s(): no memory\n", __func__);
|
|
return NF_STOLEN;
|
|
}
|
|
kfree_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));
|
|
|
|
/* drop old route */
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
/*
|
|
* 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 = rt->rt_dst;
|
|
iph->saddr = rt->rt_src;
|
|
iph->ttl = old_iph->ttl;
|
|
ip_select_ident(iph, &rt->dst, NULL);
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
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);
|
|
|
|
return NF_STOLEN;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
tx_error_put:
|
|
ip_rt_put(rt);
|
|
goto tx_error;
|
|
}
|
|
|
|
#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 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 mtu;
|
|
int ret;
|
|
|
|
EnterFunction(10);
|
|
|
|
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);
|
|
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) &&
|
|
!skb_is_gso(skb)) {
|
|
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_put;
|
|
}
|
|
|
|
/*
|
|
* 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) || skb_shared(skb)) {
|
|
struct sk_buff *new_skb =
|
|
skb_realloc_headroom(skb, max_headroom);
|
|
if (!new_skb) {
|
|
dst_release(&rt->dst);
|
|
kfree_skb(skb);
|
|
IP_VS_ERR_RL("%s(): no memory\n", __func__);
|
|
return NF_STOLEN;
|
|
}
|
|
kfree_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));
|
|
|
|
/* drop old route */
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
/*
|
|
* 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));
|
|
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;
|
|
|
|
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);
|
|
|
|
return NF_STOLEN;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
tx_error_put:
|
|
dst_release(&rt->dst);
|
|
goto tx_error;
|
|
}
|
|
#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 rtable *rt; /* Route to the other host */
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
int mtu;
|
|
|
|
EnterFunction(10);
|
|
|
|
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);
|
|
if ((iph->frag_off & htons(IP_DF)) && skb->len > mtu &&
|
|
!skb_is_gso(skb)) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Call ip_send_check because we are not sure it is called
|
|
* after ip_defrag. Is copy-on-write needed?
|
|
*/
|
|
if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) {
|
|
ip_rt_put(rt);
|
|
return NF_STOLEN;
|
|
}
|
|
ip_send_check(ip_hdr(skb));
|
|
|
|
/* drop old route */
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0);
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
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 rt6_info *rt; /* Route to the other host */
|
|
int mtu;
|
|
|
|
EnterFunction(10);
|
|
|
|
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__);
|
|
goto tx_error;
|
|
}
|
|
|
|
/*
|
|
* Call ip_send_check because we are not sure it is called
|
|
* after ip_defrag. Is copy-on-write needed?
|
|
*/
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
|
if (unlikely(skb == NULL)) {
|
|
dst_release(&rt->dst);
|
|
return NF_STOLEN;
|
|
}
|
|
|
|
/* drop old route */
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
/* Another hack: avoid icmp_send in ip_fragment */
|
|
skb->local_df = 1;
|
|
|
|
IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0);
|
|
|
|
LeaveFunction(10);
|
|
return NF_STOLEN;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
kfree_skb(skb);
|
|
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)
|
|
{
|
|
struct rtable *rt; /* Route to the other host */
|
|
int mtu;
|
|
int rc;
|
|
int local;
|
|
|
|
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);
|
|
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)
|
|
*/
|
|
|
|
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)) &&
|
|
!skb_is_gso(skb)) {
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
|
|
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
|
|
goto tx_error_put;
|
|
}
|
|
|
|
/* copy-on-write the packet before mangling it */
|
|
if (!skb_make_writable(skb, offset))
|
|
goto tx_error_put;
|
|
|
|
if (skb_cow(skb, rt->dst.dev->hard_header_len))
|
|
goto tx_error_put;
|
|
|
|
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_NAT(NFPROTO_IPV4, skb, cp, local);
|
|
|
|
rc = NF_STOLEN;
|
|
goto out;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
dev_kfree_skb(skb);
|
|
rc = NF_STOLEN;
|
|
out:
|
|
LeaveFunction(10);
|
|
return rc;
|
|
tx_error_put:
|
|
ip_rt_put(rt);
|
|
goto tx_error;
|
|
}
|
|
|
|
#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)
|
|
{
|
|
struct rt6_info *rt; /* Route to the other host */
|
|
int mtu;
|
|
int rc;
|
|
int local;
|
|
|
|
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);
|
|
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)
|
|
*/
|
|
|
|
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 && !skb_is_gso(skb)) {
|
|
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_put;
|
|
}
|
|
|
|
/* copy-on-write the packet before mangling it */
|
|
if (!skb_make_writable(skb, offset))
|
|
goto tx_error_put;
|
|
|
|
if (skb_cow(skb, rt->dst.dev->hard_header_len))
|
|
goto tx_error_put;
|
|
|
|
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_NAT(NFPROTO_IPV6, skb, cp, local);
|
|
|
|
rc = NF_STOLEN;
|
|
goto out;
|
|
|
|
tx_error_icmp:
|
|
dst_link_failure(skb);
|
|
tx_error:
|
|
dev_kfree_skb(skb);
|
|
rc = NF_STOLEN;
|
|
out:
|
|
LeaveFunction(10);
|
|
return rc;
|
|
tx_error_put:
|
|
dst_release(&rt->dst);
|
|
goto tx_error;
|
|
}
|
|
#endif
|