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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![Jiri Pirko](/assets/img/avatar_default.png)
Pushing original fragments through causes several problems. For example for matching, frags may not be matched correctly. Take following example: <example> On HOSTA do: ip6tables -I INPUT -p icmpv6 -j DROP ip6tables -I INPUT -p icmpv6 -m icmp6 --icmpv6-type 128 -j ACCEPT and on HOSTB you do: ping6 HOSTA -s2000 (MTU is 1500) Incoming echo requests will be filtered out on HOSTA. This issue does not occur with smaller packets than MTU (where fragmentation does not happen) </example> As was discussed previously, the only correct solution seems to be to use reassembled skb instead of separete frags. Doing this has positive side effects in reducing sk_buff by one pointer (nfct_reasm) and also the reams dances in ipvs and conntrack can be removed. Future plan is to remove net/ipv6/netfilter/nf_conntrack_reasm.c entirely and use code in net/ipv6/reassembly.c instead. Signed-off-by: Jiri Pirko <jiri@resnulli.us> Acked-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1628 lines
45 KiB
C
1628 lines
45 KiB
C
/*
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* IP Virtual Server
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* data structure and functionality definitions
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*/
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#ifndef _NET_IP_VS_H
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#define _NET_IP_VS_H
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#include <linux/ip_vs.h> /* definitions shared with userland */
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#include <asm/types.h> /* for __uXX types */
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#include <linux/list.h> /* for struct list_head */
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#include <linux/spinlock.h> /* for struct rwlock_t */
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#include <linux/atomic.h> /* for struct atomic_t */
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#include <linux/compiler.h>
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#include <linux/timer.h>
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#include <linux/bug.h>
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#include <net/checksum.h>
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#include <linux/netfilter.h> /* for union nf_inet_addr */
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#include <linux/ip.h>
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#include <linux/ipv6.h> /* for struct ipv6hdr */
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#include <net/ipv6.h>
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#if IS_ENABLED(CONFIG_IP_VS_IPV6)
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#endif
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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#include <net/netfilter/nf_conntrack.h>
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#endif
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#include <net/net_namespace.h> /* Netw namespace */
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/*
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* Generic access of ipvs struct
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*/
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static inline struct netns_ipvs *net_ipvs(struct net* net)
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{
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return net->ipvs;
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}
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/*
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* Get net ptr from skb in traffic cases
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* use skb_sknet when call is from userland (ioctl or netlink)
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*/
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static inline struct net *skb_net(const struct sk_buff *skb)
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{
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#ifdef CONFIG_NET_NS
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#ifdef CONFIG_IP_VS_DEBUG
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/*
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* This is used for debug only.
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* Start with the most likely hit
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* End with BUG
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*/
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if (likely(skb->dev && skb->dev->nd_net))
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return dev_net(skb->dev);
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if (skb_dst(skb) && skb_dst(skb)->dev)
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return dev_net(skb_dst(skb)->dev);
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WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
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__func__, __LINE__);
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if (likely(skb->sk && skb->sk->sk_net))
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return sock_net(skb->sk);
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pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
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__func__, __LINE__);
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BUG();
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#else
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return dev_net(skb->dev ? : skb_dst(skb)->dev);
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#endif
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#else
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return &init_net;
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#endif
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}
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static inline struct net *skb_sknet(const struct sk_buff *skb)
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{
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#ifdef CONFIG_NET_NS
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#ifdef CONFIG_IP_VS_DEBUG
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/* Start with the most likely hit */
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if (likely(skb->sk && skb->sk->sk_net))
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return sock_net(skb->sk);
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WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
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__func__, __LINE__);
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if (likely(skb->dev && skb->dev->nd_net))
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return dev_net(skb->dev);
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pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
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__func__, __LINE__);
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BUG();
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#else
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return sock_net(skb->sk);
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#endif
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#else
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return &init_net;
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#endif
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}
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/*
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* This one needed for single_open_net since net is stored directly in
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* private not as a struct i.e. seq_file_net can't be used.
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*/
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static inline struct net *seq_file_single_net(struct seq_file *seq)
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{
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#ifdef CONFIG_NET_NS
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return (struct net *)seq->private;
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#else
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return &init_net;
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#endif
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}
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/* Connections' size value needed by ip_vs_ctl.c */
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extern int ip_vs_conn_tab_size;
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struct ip_vs_iphdr {
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__u32 len; /* IPv4 simply where L4 starts
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IPv6 where L4 Transport Header starts */
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__u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
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__s16 protocol;
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__s32 flags;
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union nf_inet_addr saddr;
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union nf_inet_addr daddr;
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};
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static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
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int len, void *buffer,
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const struct ip_vs_iphdr *ipvsh)
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{
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return skb_header_pointer(skb, offset, len, buffer);
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}
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static inline void
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ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
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{
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const struct iphdr *iph = nh;
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iphdr->len = iph->ihl * 4;
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iphdr->fragoffs = 0;
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iphdr->protocol = iph->protocol;
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iphdr->saddr.ip = iph->saddr;
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iphdr->daddr.ip = iph->daddr;
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}
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/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
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* IPv6 requires some extra work, as finding proper header position,
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* depend on the IPv6 extension headers.
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*/
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static inline void
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ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
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{
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#ifdef CONFIG_IP_VS_IPV6
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if (af == AF_INET6) {
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const struct ipv6hdr *iph =
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(struct ipv6hdr *)skb_network_header(skb);
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iphdr->saddr.in6 = iph->saddr;
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iphdr->daddr.in6 = iph->daddr;
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/* ipv6_find_hdr() updates len, flags */
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iphdr->len = 0;
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iphdr->flags = 0;
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iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
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&iphdr->fragoffs,
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&iphdr->flags);
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} else
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#endif
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{
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const struct iphdr *iph =
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(struct iphdr *)skb_network_header(skb);
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iphdr->len = iph->ihl * 4;
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iphdr->fragoffs = 0;
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iphdr->protocol = iph->protocol;
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iphdr->saddr.ip = iph->saddr;
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iphdr->daddr.ip = iph->daddr;
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}
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}
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static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
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const union nf_inet_addr *src)
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{
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#ifdef CONFIG_IP_VS_IPV6
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if (af == AF_INET6)
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dst->in6 = src->in6;
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else
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#endif
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dst->ip = src->ip;
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}
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static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
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const union nf_inet_addr *src)
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{
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#ifdef CONFIG_IP_VS_IPV6
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if (af == AF_INET6) {
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dst->in6 = src->in6;
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return;
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}
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#endif
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dst->ip = src->ip;
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dst->all[1] = 0;
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dst->all[2] = 0;
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dst->all[3] = 0;
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}
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static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
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const union nf_inet_addr *b)
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{
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#ifdef CONFIG_IP_VS_IPV6
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if (af == AF_INET6)
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return ipv6_addr_equal(&a->in6, &b->in6);
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#endif
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return a->ip == b->ip;
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}
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#ifdef CONFIG_IP_VS_DEBUG
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#include <linux/net.h>
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int ip_vs_get_debug_level(void);
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static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
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const union nf_inet_addr *addr,
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int *idx)
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{
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int len;
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#ifdef CONFIG_IP_VS_IPV6
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if (af == AF_INET6)
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len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
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&addr->in6) + 1;
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else
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#endif
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len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
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&addr->ip) + 1;
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*idx += len;
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BUG_ON(*idx > buf_len + 1);
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return &buf[*idx - len];
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}
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#define IP_VS_DBG_BUF(level, msg, ...) \
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do { \
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char ip_vs_dbg_buf[160]; \
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int ip_vs_dbg_idx = 0; \
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if (level <= ip_vs_get_debug_level()) \
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printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
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} while (0)
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#define IP_VS_ERR_BUF(msg...) \
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do { \
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char ip_vs_dbg_buf[160]; \
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int ip_vs_dbg_idx = 0; \
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pr_err(msg); \
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} while (0)
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/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
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#define IP_VS_DBG_ADDR(af, addr) \
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ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
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sizeof(ip_vs_dbg_buf), addr, \
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&ip_vs_dbg_idx)
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#define IP_VS_DBG(level, msg, ...) \
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do { \
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if (level <= ip_vs_get_debug_level()) \
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printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
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} while (0)
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#define IP_VS_DBG_RL(msg, ...) \
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do { \
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if (net_ratelimit()) \
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printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
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} while (0)
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#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
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do { \
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if (level <= ip_vs_get_debug_level()) \
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pp->debug_packet(af, pp, skb, ofs, msg); \
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} while (0)
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#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
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do { \
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if (level <= ip_vs_get_debug_level() && \
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net_ratelimit()) \
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pp->debug_packet(af, pp, skb, ofs, msg); \
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} while (0)
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#else /* NO DEBUGGING at ALL */
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#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
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#define IP_VS_ERR_BUF(msg...) do {} while (0)
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#define IP_VS_DBG(level, msg...) do {} while (0)
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#define IP_VS_DBG_RL(msg...) do {} while (0)
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#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
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#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
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#endif
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#define IP_VS_BUG() BUG()
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#define IP_VS_ERR_RL(msg, ...) \
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do { \
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if (net_ratelimit()) \
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pr_err(msg, ##__VA_ARGS__); \
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} while (0)
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#ifdef CONFIG_IP_VS_DEBUG
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#define EnterFunction(level) \
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do { \
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if (level <= ip_vs_get_debug_level()) \
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printk(KERN_DEBUG \
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pr_fmt("Enter: %s, %s line %i\n"), \
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__func__, __FILE__, __LINE__); \
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} while (0)
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#define LeaveFunction(level) \
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do { \
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if (level <= ip_vs_get_debug_level()) \
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printk(KERN_DEBUG \
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pr_fmt("Leave: %s, %s line %i\n"), \
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__func__, __FILE__, __LINE__); \
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} while (0)
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#else
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#define EnterFunction(level) do {} while (0)
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#define LeaveFunction(level) do {} while (0)
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#endif
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/*
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* The port number of FTP service (in network order).
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*/
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#define FTPPORT cpu_to_be16(21)
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#define FTPDATA cpu_to_be16(20)
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/*
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* TCP State Values
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*/
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enum {
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IP_VS_TCP_S_NONE = 0,
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IP_VS_TCP_S_ESTABLISHED,
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IP_VS_TCP_S_SYN_SENT,
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IP_VS_TCP_S_SYN_RECV,
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IP_VS_TCP_S_FIN_WAIT,
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IP_VS_TCP_S_TIME_WAIT,
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IP_VS_TCP_S_CLOSE,
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IP_VS_TCP_S_CLOSE_WAIT,
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IP_VS_TCP_S_LAST_ACK,
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IP_VS_TCP_S_LISTEN,
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IP_VS_TCP_S_SYNACK,
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IP_VS_TCP_S_LAST
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};
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/*
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* UDP State Values
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*/
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enum {
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IP_VS_UDP_S_NORMAL,
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IP_VS_UDP_S_LAST,
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};
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/*
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* ICMP State Values
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*/
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enum {
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IP_VS_ICMP_S_NORMAL,
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IP_VS_ICMP_S_LAST,
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};
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/*
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* SCTP State Values
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*/
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enum ip_vs_sctp_states {
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IP_VS_SCTP_S_NONE,
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IP_VS_SCTP_S_INIT1,
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IP_VS_SCTP_S_INIT,
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IP_VS_SCTP_S_COOKIE_SENT,
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IP_VS_SCTP_S_COOKIE_REPLIED,
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IP_VS_SCTP_S_COOKIE_WAIT,
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IP_VS_SCTP_S_COOKIE,
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IP_VS_SCTP_S_COOKIE_ECHOED,
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IP_VS_SCTP_S_ESTABLISHED,
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IP_VS_SCTP_S_SHUTDOWN_SENT,
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IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
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IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
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IP_VS_SCTP_S_REJECTED,
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IP_VS_SCTP_S_CLOSED,
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IP_VS_SCTP_S_LAST
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};
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/*
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* Delta sequence info structure
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* Each ip_vs_conn has 2 (output AND input seq. changes).
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* Only used in the VS/NAT.
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*/
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struct ip_vs_seq {
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__u32 init_seq; /* Add delta from this seq */
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__u32 delta; /* Delta in sequence numbers */
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__u32 previous_delta; /* Delta in sequence numbers
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before last resized pkt */
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};
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/*
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* counters per cpu
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*/
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struct ip_vs_counters {
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__u32 conns; /* connections scheduled */
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__u32 inpkts; /* incoming packets */
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__u32 outpkts; /* outgoing packets */
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__u64 inbytes; /* incoming bytes */
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__u64 outbytes; /* outgoing bytes */
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};
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/*
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* Stats per cpu
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*/
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struct ip_vs_cpu_stats {
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struct ip_vs_counters ustats;
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struct u64_stats_sync syncp;
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};
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/*
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* IPVS statistics objects
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*/
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struct ip_vs_estimator {
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struct list_head list;
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u64 last_inbytes;
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u64 last_outbytes;
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u32 last_conns;
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u32 last_inpkts;
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u32 last_outpkts;
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u32 cps;
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u32 inpps;
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u32 outpps;
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u32 inbps;
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u32 outbps;
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};
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struct ip_vs_stats {
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struct ip_vs_stats_user ustats; /* statistics */
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struct ip_vs_estimator est; /* estimator */
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struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
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spinlock_t lock; /* spin lock */
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struct ip_vs_stats_user ustats0; /* reset values */
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};
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struct dst_entry;
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struct iphdr;
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struct ip_vs_conn;
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struct ip_vs_app;
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struct sk_buff;
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struct ip_vs_proto_data;
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struct ip_vs_protocol {
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struct ip_vs_protocol *next;
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char *name;
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u16 protocol;
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u16 num_states;
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int dont_defrag;
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void (*init)(struct ip_vs_protocol *pp);
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void (*exit)(struct ip_vs_protocol *pp);
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int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
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void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
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int (*conn_schedule)(int af, struct sk_buff *skb,
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struct ip_vs_proto_data *pd,
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int *verdict, struct ip_vs_conn **cpp,
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struct ip_vs_iphdr *iph);
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|
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struct ip_vs_conn *
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(*conn_in_get)(int af,
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const struct sk_buff *skb,
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const struct ip_vs_iphdr *iph,
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int inverse);
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|
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struct ip_vs_conn *
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(*conn_out_get)(int af,
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const struct sk_buff *skb,
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const struct ip_vs_iphdr *iph,
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int inverse);
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int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
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struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
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int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
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struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
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int (*csum_check)(int af, struct sk_buff *skb,
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struct ip_vs_protocol *pp);
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const char *(*state_name)(int state);
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void (*state_transition)(struct ip_vs_conn *cp, int direction,
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|
const struct sk_buff *skb,
|
|
struct ip_vs_proto_data *pd);
|
|
|
|
int (*register_app)(struct net *net, struct ip_vs_app *inc);
|
|
|
|
void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
|
|
|
|
int (*app_conn_bind)(struct ip_vs_conn *cp);
|
|
|
|
void (*debug_packet)(int af, struct ip_vs_protocol *pp,
|
|
const struct sk_buff *skb,
|
|
int offset,
|
|
const char *msg);
|
|
|
|
void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
|
|
};
|
|
|
|
/*
|
|
* protocol data per netns
|
|
*/
|
|
struct ip_vs_proto_data {
|
|
struct ip_vs_proto_data *next;
|
|
struct ip_vs_protocol *pp;
|
|
int *timeout_table; /* protocol timeout table */
|
|
atomic_t appcnt; /* counter of proto app incs. */
|
|
struct tcp_states_t *tcp_state_table;
|
|
};
|
|
|
|
struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
|
|
struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
|
|
unsigned short proto);
|
|
|
|
struct ip_vs_conn_param {
|
|
struct net *net;
|
|
const union nf_inet_addr *caddr;
|
|
const union nf_inet_addr *vaddr;
|
|
__be16 cport;
|
|
__be16 vport;
|
|
__u16 protocol;
|
|
u16 af;
|
|
|
|
const struct ip_vs_pe *pe;
|
|
char *pe_data;
|
|
__u8 pe_data_len;
|
|
};
|
|
|
|
/*
|
|
* IP_VS structure allocated for each dynamically scheduled connection
|
|
*/
|
|
struct ip_vs_conn {
|
|
struct hlist_node c_list; /* hashed list heads */
|
|
/* Protocol, addresses and port numbers */
|
|
__be16 cport;
|
|
__be16 dport;
|
|
__be16 vport;
|
|
u16 af; /* address family */
|
|
union nf_inet_addr caddr; /* client address */
|
|
union nf_inet_addr vaddr; /* virtual address */
|
|
union nf_inet_addr daddr; /* destination address */
|
|
volatile __u32 flags; /* status flags */
|
|
__u16 protocol; /* Which protocol (TCP/UDP) */
|
|
#ifdef CONFIG_NET_NS
|
|
struct net *net; /* Name space */
|
|
#endif
|
|
|
|
/* counter and timer */
|
|
atomic_t refcnt; /* reference count */
|
|
struct timer_list timer; /* Expiration timer */
|
|
volatile unsigned long timeout; /* timeout */
|
|
|
|
/* Flags and state transition */
|
|
spinlock_t lock; /* lock for state transition */
|
|
volatile __u16 state; /* state info */
|
|
volatile __u16 old_state; /* old state, to be used for
|
|
* state transition triggerd
|
|
* synchronization
|
|
*/
|
|
__u32 fwmark; /* Fire wall mark from skb */
|
|
unsigned long sync_endtime; /* jiffies + sent_retries */
|
|
|
|
/* Control members */
|
|
struct ip_vs_conn *control; /* Master control connection */
|
|
atomic_t n_control; /* Number of controlled ones */
|
|
struct ip_vs_dest *dest; /* real server */
|
|
atomic_t in_pkts; /* incoming packet counter */
|
|
|
|
/* packet transmitter for different forwarding methods. If it
|
|
mangles the packet, it must return NF_DROP or better NF_STOLEN,
|
|
otherwise this must be changed to a sk_buff **.
|
|
NF_ACCEPT can be returned when destination is local.
|
|
*/
|
|
int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
|
|
|
|
/* Note: we can group the following members into a structure,
|
|
in order to save more space, and the following members are
|
|
only used in VS/NAT anyway */
|
|
struct ip_vs_app *app; /* bound ip_vs_app object */
|
|
void *app_data; /* Application private data */
|
|
struct ip_vs_seq in_seq; /* incoming seq. struct */
|
|
struct ip_vs_seq out_seq; /* outgoing seq. struct */
|
|
|
|
const struct ip_vs_pe *pe;
|
|
char *pe_data;
|
|
__u8 pe_data_len;
|
|
|
|
struct rcu_head rcu_head;
|
|
};
|
|
|
|
/*
|
|
* To save some memory in conn table when name space is disabled.
|
|
*/
|
|
static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
|
|
{
|
|
#ifdef CONFIG_NET_NS
|
|
return cp->net;
|
|
#else
|
|
return &init_net;
|
|
#endif
|
|
}
|
|
static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
|
|
{
|
|
#ifdef CONFIG_NET_NS
|
|
cp->net = net;
|
|
#endif
|
|
}
|
|
|
|
static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
|
|
struct net *net)
|
|
{
|
|
#ifdef CONFIG_NET_NS
|
|
return cp->net == net;
|
|
#else
|
|
return 1;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Extended internal versions of struct ip_vs_service_user and
|
|
* ip_vs_dest_user for IPv6 support.
|
|
*
|
|
* We need these to conveniently pass around service and destination
|
|
* options, but unfortunately, we also need to keep the old definitions to
|
|
* maintain userspace backwards compatibility for the setsockopt interface.
|
|
*/
|
|
struct ip_vs_service_user_kern {
|
|
/* virtual service addresses */
|
|
u16 af;
|
|
u16 protocol;
|
|
union nf_inet_addr addr; /* virtual ip address */
|
|
__be16 port;
|
|
u32 fwmark; /* firwall mark of service */
|
|
|
|
/* virtual service options */
|
|
char *sched_name;
|
|
char *pe_name;
|
|
unsigned int flags; /* virtual service flags */
|
|
unsigned int timeout; /* persistent timeout in sec */
|
|
__be32 netmask; /* persistent netmask or plen */
|
|
};
|
|
|
|
|
|
struct ip_vs_dest_user_kern {
|
|
/* destination server address */
|
|
union nf_inet_addr addr;
|
|
__be16 port;
|
|
|
|
/* real server options */
|
|
unsigned int conn_flags; /* connection flags */
|
|
int weight; /* destination weight */
|
|
|
|
/* thresholds for active connections */
|
|
u32 u_threshold; /* upper threshold */
|
|
u32 l_threshold; /* lower threshold */
|
|
};
|
|
|
|
|
|
/*
|
|
* The information about the virtual service offered to the net
|
|
* and the forwarding entries
|
|
*/
|
|
struct ip_vs_service {
|
|
struct hlist_node s_list; /* for normal service table */
|
|
struct hlist_node f_list; /* for fwmark-based service table */
|
|
atomic_t refcnt; /* reference counter */
|
|
|
|
u16 af; /* address family */
|
|
__u16 protocol; /* which protocol (TCP/UDP) */
|
|
union nf_inet_addr addr; /* IP address for virtual service */
|
|
__be16 port; /* port number for the service */
|
|
__u32 fwmark; /* firewall mark of the service */
|
|
unsigned int flags; /* service status flags */
|
|
unsigned int timeout; /* persistent timeout in ticks */
|
|
__be32 netmask; /* grouping granularity, mask/plen */
|
|
struct net *net;
|
|
|
|
struct list_head destinations; /* real server d-linked list */
|
|
__u32 num_dests; /* number of servers */
|
|
struct ip_vs_stats stats; /* statistics for the service */
|
|
|
|
/* for scheduling */
|
|
struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
|
|
spinlock_t sched_lock; /* lock sched_data */
|
|
void *sched_data; /* scheduler application data */
|
|
|
|
/* alternate persistence engine */
|
|
struct ip_vs_pe __rcu *pe;
|
|
|
|
struct rcu_head rcu_head;
|
|
};
|
|
|
|
/* Information for cached dst */
|
|
struct ip_vs_dest_dst {
|
|
struct dst_entry *dst_cache; /* destination cache entry */
|
|
u32 dst_cookie;
|
|
union nf_inet_addr dst_saddr;
|
|
struct rcu_head rcu_head;
|
|
};
|
|
|
|
/*
|
|
* The real server destination forwarding entry
|
|
* with ip address, port number, and so on.
|
|
*/
|
|
struct ip_vs_dest {
|
|
struct list_head n_list; /* for the dests in the service */
|
|
struct hlist_node d_list; /* for table with all the dests */
|
|
|
|
u16 af; /* address family */
|
|
__be16 port; /* port number of the server */
|
|
union nf_inet_addr addr; /* IP address of the server */
|
|
volatile unsigned int flags; /* dest status flags */
|
|
atomic_t conn_flags; /* flags to copy to conn */
|
|
atomic_t weight; /* server weight */
|
|
|
|
atomic_t refcnt; /* reference counter */
|
|
struct ip_vs_stats stats; /* statistics */
|
|
unsigned long idle_start; /* start time, jiffies */
|
|
|
|
/* connection counters and thresholds */
|
|
atomic_t activeconns; /* active connections */
|
|
atomic_t inactconns; /* inactive connections */
|
|
atomic_t persistconns; /* persistent connections */
|
|
__u32 u_threshold; /* upper threshold */
|
|
__u32 l_threshold; /* lower threshold */
|
|
|
|
/* for destination cache */
|
|
spinlock_t dst_lock; /* lock of dst_cache */
|
|
struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
|
|
|
|
/* for virtual service */
|
|
struct ip_vs_service __rcu *svc; /* service it belongs to */
|
|
__u16 protocol; /* which protocol (TCP/UDP) */
|
|
__be16 vport; /* virtual port number */
|
|
union nf_inet_addr vaddr; /* virtual IP address */
|
|
__u32 vfwmark; /* firewall mark of service */
|
|
|
|
struct list_head t_list; /* in dest_trash */
|
|
unsigned int in_rs_table:1; /* we are in rs_table */
|
|
};
|
|
|
|
|
|
/*
|
|
* The scheduler object
|
|
*/
|
|
struct ip_vs_scheduler {
|
|
struct list_head n_list; /* d-linked list head */
|
|
char *name; /* scheduler name */
|
|
atomic_t refcnt; /* reference counter */
|
|
struct module *module; /* THIS_MODULE/NULL */
|
|
|
|
/* scheduler initializing service */
|
|
int (*init_service)(struct ip_vs_service *svc);
|
|
/* scheduling service finish */
|
|
void (*done_service)(struct ip_vs_service *svc);
|
|
/* dest is linked */
|
|
int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
|
|
/* dest is unlinked */
|
|
int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
|
|
/* dest is updated */
|
|
int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
|
|
|
|
/* selecting a server from the given service */
|
|
struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
|
|
const struct sk_buff *skb,
|
|
struct ip_vs_iphdr *iph);
|
|
};
|
|
|
|
/* The persistence engine object */
|
|
struct ip_vs_pe {
|
|
struct list_head n_list; /* d-linked list head */
|
|
char *name; /* scheduler name */
|
|
atomic_t refcnt; /* reference counter */
|
|
struct module *module; /* THIS_MODULE/NULL */
|
|
|
|
/* get the connection template, if any */
|
|
int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
|
|
bool (*ct_match)(const struct ip_vs_conn_param *p,
|
|
struct ip_vs_conn *ct);
|
|
u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
|
|
bool inverse);
|
|
int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
|
|
};
|
|
|
|
/*
|
|
* The application module object (a.k.a. app incarnation)
|
|
*/
|
|
struct ip_vs_app {
|
|
struct list_head a_list; /* member in app list */
|
|
int type; /* IP_VS_APP_TYPE_xxx */
|
|
char *name; /* application module name */
|
|
__u16 protocol;
|
|
struct module *module; /* THIS_MODULE/NULL */
|
|
struct list_head incs_list; /* list of incarnations */
|
|
|
|
/* members for application incarnations */
|
|
struct list_head p_list; /* member in proto app list */
|
|
struct ip_vs_app *app; /* its real application */
|
|
__be16 port; /* port number in net order */
|
|
atomic_t usecnt; /* usage counter */
|
|
struct rcu_head rcu_head;
|
|
|
|
/*
|
|
* output hook: Process packet in inout direction, diff set for TCP.
|
|
* Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
|
|
* 2=Mangled but checksum was not updated
|
|
*/
|
|
int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
|
|
struct sk_buff *, int *diff);
|
|
|
|
/*
|
|
* input hook: Process packet in outin direction, diff set for TCP.
|
|
* Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
|
|
* 2=Mangled but checksum was not updated
|
|
*/
|
|
int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
|
|
struct sk_buff *, int *diff);
|
|
|
|
/* ip_vs_app initializer */
|
|
int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
|
|
|
|
/* ip_vs_app finish */
|
|
int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
|
|
|
|
|
|
/* not used now */
|
|
int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
|
|
struct ip_vs_protocol *);
|
|
|
|
void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
|
|
|
|
int * timeout_table;
|
|
int * timeouts;
|
|
int timeouts_size;
|
|
|
|
int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
|
|
int *verdict, struct ip_vs_conn **cpp);
|
|
|
|
struct ip_vs_conn *
|
|
(*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
|
|
const struct iphdr *iph, int inverse);
|
|
|
|
struct ip_vs_conn *
|
|
(*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
|
|
const struct iphdr *iph, int inverse);
|
|
|
|
int (*state_transition)(struct ip_vs_conn *cp, int direction,
|
|
const struct sk_buff *skb,
|
|
struct ip_vs_app *app);
|
|
|
|
void (*timeout_change)(struct ip_vs_app *app, int flags);
|
|
};
|
|
|
|
struct ipvs_master_sync_state {
|
|
struct list_head sync_queue;
|
|
struct ip_vs_sync_buff *sync_buff;
|
|
unsigned long sync_queue_len;
|
|
unsigned int sync_queue_delay;
|
|
struct task_struct *master_thread;
|
|
struct delayed_work master_wakeup_work;
|
|
struct netns_ipvs *ipvs;
|
|
};
|
|
|
|
/* How much time to keep dests in trash */
|
|
#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
|
|
|
|
/* IPVS in network namespace */
|
|
struct netns_ipvs {
|
|
int gen; /* Generation */
|
|
int enable; /* enable like nf_hooks do */
|
|
/*
|
|
* Hash table: for real service lookups
|
|
*/
|
|
#define IP_VS_RTAB_BITS 4
|
|
#define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
|
|
#define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
|
|
|
|
struct hlist_head rs_table[IP_VS_RTAB_SIZE];
|
|
/* ip_vs_app */
|
|
struct list_head app_list;
|
|
/* ip_vs_proto */
|
|
#define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
|
|
struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
|
|
/* ip_vs_proto_tcp */
|
|
#ifdef CONFIG_IP_VS_PROTO_TCP
|
|
#define TCP_APP_TAB_BITS 4
|
|
#define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
|
|
#define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
|
|
struct list_head tcp_apps[TCP_APP_TAB_SIZE];
|
|
#endif
|
|
/* ip_vs_proto_udp */
|
|
#ifdef CONFIG_IP_VS_PROTO_UDP
|
|
#define UDP_APP_TAB_BITS 4
|
|
#define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
|
|
#define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
|
|
struct list_head udp_apps[UDP_APP_TAB_SIZE];
|
|
#endif
|
|
/* ip_vs_proto_sctp */
|
|
#ifdef CONFIG_IP_VS_PROTO_SCTP
|
|
#define SCTP_APP_TAB_BITS 4
|
|
#define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
|
|
#define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
|
|
/* Hash table for SCTP application incarnations */
|
|
struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
|
|
#endif
|
|
/* ip_vs_conn */
|
|
atomic_t conn_count; /* connection counter */
|
|
|
|
/* ip_vs_ctl */
|
|
struct ip_vs_stats tot_stats; /* Statistics & est. */
|
|
|
|
int num_services; /* no of virtual services */
|
|
|
|
/* Trash for destinations */
|
|
struct list_head dest_trash;
|
|
spinlock_t dest_trash_lock;
|
|
struct timer_list dest_trash_timer; /* expiration timer */
|
|
/* Service counters */
|
|
atomic_t ftpsvc_counter;
|
|
atomic_t nullsvc_counter;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
/* 1/rate drop and drop-entry variables */
|
|
struct delayed_work defense_work; /* Work handler */
|
|
int drop_rate;
|
|
int drop_counter;
|
|
atomic_t dropentry;
|
|
/* locks in ctl.c */
|
|
spinlock_t dropentry_lock; /* drop entry handling */
|
|
spinlock_t droppacket_lock; /* drop packet handling */
|
|
spinlock_t securetcp_lock; /* state and timeout tables */
|
|
|
|
/* sys-ctl struct */
|
|
struct ctl_table_header *sysctl_hdr;
|
|
struct ctl_table *sysctl_tbl;
|
|
#endif
|
|
|
|
/* sysctl variables */
|
|
int sysctl_amemthresh;
|
|
int sysctl_am_droprate;
|
|
int sysctl_drop_entry;
|
|
int sysctl_drop_packet;
|
|
int sysctl_secure_tcp;
|
|
#ifdef CONFIG_IP_VS_NFCT
|
|
int sysctl_conntrack;
|
|
#endif
|
|
int sysctl_snat_reroute;
|
|
int sysctl_sync_ver;
|
|
int sysctl_sync_ports;
|
|
int sysctl_sync_persist_mode;
|
|
unsigned long sysctl_sync_qlen_max;
|
|
int sysctl_sync_sock_size;
|
|
int sysctl_cache_bypass;
|
|
int sysctl_expire_nodest_conn;
|
|
int sysctl_sloppy_tcp;
|
|
int sysctl_sloppy_sctp;
|
|
int sysctl_expire_quiescent_template;
|
|
int sysctl_sync_threshold[2];
|
|
unsigned int sysctl_sync_refresh_period;
|
|
int sysctl_sync_retries;
|
|
int sysctl_nat_icmp_send;
|
|
int sysctl_pmtu_disc;
|
|
int sysctl_backup_only;
|
|
|
|
/* ip_vs_lblc */
|
|
int sysctl_lblc_expiration;
|
|
struct ctl_table_header *lblc_ctl_header;
|
|
struct ctl_table *lblc_ctl_table;
|
|
/* ip_vs_lblcr */
|
|
int sysctl_lblcr_expiration;
|
|
struct ctl_table_header *lblcr_ctl_header;
|
|
struct ctl_table *lblcr_ctl_table;
|
|
/* ip_vs_est */
|
|
struct list_head est_list; /* estimator list */
|
|
spinlock_t est_lock;
|
|
struct timer_list est_timer; /* Estimation timer */
|
|
/* ip_vs_sync */
|
|
spinlock_t sync_lock;
|
|
struct ipvs_master_sync_state *ms;
|
|
spinlock_t sync_buff_lock;
|
|
struct task_struct **backup_threads;
|
|
int threads_mask;
|
|
int send_mesg_maxlen;
|
|
int recv_mesg_maxlen;
|
|
volatile int sync_state;
|
|
volatile int master_syncid;
|
|
volatile int backup_syncid;
|
|
struct mutex sync_mutex;
|
|
/* multicast interface name */
|
|
char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
|
|
char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
|
|
/* net name space ptr */
|
|
struct net *net; /* Needed by timer routines */
|
|
};
|
|
|
|
#define DEFAULT_SYNC_THRESHOLD 3
|
|
#define DEFAULT_SYNC_PERIOD 50
|
|
#define DEFAULT_SYNC_VER 1
|
|
#define DEFAULT_SLOPPY_TCP 0
|
|
#define DEFAULT_SLOPPY_SCTP 0
|
|
#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
|
|
#define DEFAULT_SYNC_RETRIES 0
|
|
#define IPVS_SYNC_WAKEUP_RATE 8
|
|
#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
|
|
#define IPVS_SYNC_SEND_DELAY (HZ / 50)
|
|
#define IPVS_SYNC_CHECK_PERIOD HZ
|
|
#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
|
|
#define IPVS_SYNC_PORTS_MAX (1 << 6)
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_sync_threshold[0];
|
|
}
|
|
|
|
static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
|
|
{
|
|
return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
|
|
}
|
|
|
|
static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
|
|
{
|
|
return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
|
|
}
|
|
|
|
static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_sync_retries;
|
|
}
|
|
|
|
static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_sync_ver;
|
|
}
|
|
|
|
static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_sloppy_tcp;
|
|
}
|
|
|
|
static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_sloppy_sctp;
|
|
}
|
|
|
|
static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
|
|
{
|
|
return ACCESS_ONCE(ipvs->sysctl_sync_ports);
|
|
}
|
|
|
|
static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_sync_persist_mode;
|
|
}
|
|
|
|
static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_sync_qlen_max;
|
|
}
|
|
|
|
static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_sync_sock_size;
|
|
}
|
|
|
|
static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_pmtu_disc;
|
|
}
|
|
|
|
static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sync_state & IP_VS_STATE_BACKUP &&
|
|
ipvs->sysctl_backup_only;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
|
|
{
|
|
return DEFAULT_SYNC_THRESHOLD;
|
|
}
|
|
|
|
static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
|
|
{
|
|
return DEFAULT_SYNC_PERIOD;
|
|
}
|
|
|
|
static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
|
|
{
|
|
return DEFAULT_SYNC_REFRESH_PERIOD;
|
|
}
|
|
|
|
static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
|
|
{
|
|
return DEFAULT_SYNC_RETRIES & 3;
|
|
}
|
|
|
|
static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
|
|
{
|
|
return DEFAULT_SYNC_VER;
|
|
}
|
|
|
|
static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
|
|
{
|
|
return DEFAULT_SLOPPY_TCP;
|
|
}
|
|
|
|
static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
|
|
{
|
|
return DEFAULT_SLOPPY_SCTP;
|
|
}
|
|
|
|
static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
|
|
{
|
|
return IPVS_SYNC_QLEN_MAX;
|
|
}
|
|
|
|
static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* IPVS core functions
|
|
* (from ip_vs_core.c)
|
|
*/
|
|
const char *ip_vs_proto_name(unsigned int proto);
|
|
void ip_vs_init_hash_table(struct list_head *table, int rows);
|
|
#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
|
|
|
|
#define IP_VS_APP_TYPE_FTP 1
|
|
|
|
/*
|
|
* ip_vs_conn handling functions
|
|
* (from ip_vs_conn.c)
|
|
*/
|
|
|
|
enum {
|
|
IP_VS_DIR_INPUT = 0,
|
|
IP_VS_DIR_OUTPUT,
|
|
IP_VS_DIR_INPUT_ONLY,
|
|
IP_VS_DIR_LAST,
|
|
};
|
|
|
|
static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
|
|
const union nf_inet_addr *caddr,
|
|
__be16 cport,
|
|
const union nf_inet_addr *vaddr,
|
|
__be16 vport,
|
|
struct ip_vs_conn_param *p)
|
|
{
|
|
p->net = net;
|
|
p->af = af;
|
|
p->protocol = protocol;
|
|
p->caddr = caddr;
|
|
p->cport = cport;
|
|
p->vaddr = vaddr;
|
|
p->vport = vport;
|
|
p->pe = NULL;
|
|
p->pe_data = NULL;
|
|
}
|
|
|
|
struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
|
|
struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
|
|
|
|
struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
|
|
const struct ip_vs_iphdr *iph,
|
|
int inverse);
|
|
|
|
struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
|
|
|
|
struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
|
|
const struct ip_vs_iphdr *iph,
|
|
int inverse);
|
|
|
|
/* Get reference to gain full access to conn.
|
|
* By default, RCU read-side critical sections have access only to
|
|
* conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
|
|
*/
|
|
static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
|
|
{
|
|
return atomic_inc_not_zero(&cp->refcnt);
|
|
}
|
|
|
|
/* put back the conn without restarting its timer */
|
|
static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
|
|
{
|
|
smp_mb__before_atomic_dec();
|
|
atomic_dec(&cp->refcnt);
|
|
}
|
|
void ip_vs_conn_put(struct ip_vs_conn *cp);
|
|
void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
|
|
|
|
struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
|
|
const union nf_inet_addr *daddr,
|
|
__be16 dport, unsigned int flags,
|
|
struct ip_vs_dest *dest, __u32 fwmark);
|
|
void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
|
|
|
|
const char *ip_vs_state_name(__u16 proto, int state);
|
|
|
|
void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
|
|
int ip_vs_check_template(struct ip_vs_conn *ct);
|
|
void ip_vs_random_dropentry(struct net *net);
|
|
int ip_vs_conn_init(void);
|
|
void ip_vs_conn_cleanup(void);
|
|
|
|
static inline void ip_vs_control_del(struct ip_vs_conn *cp)
|
|
{
|
|
struct ip_vs_conn *ctl_cp = cp->control;
|
|
if (!ctl_cp) {
|
|
IP_VS_ERR_BUF("request control DEL for uncontrolled: "
|
|
"%s:%d to %s:%d\n",
|
|
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
|
|
ntohs(cp->cport),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
|
|
ntohs(cp->vport));
|
|
|
|
return;
|
|
}
|
|
|
|
IP_VS_DBG_BUF(7, "DELeting control for: "
|
|
"cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
|
|
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
|
|
ntohs(cp->cport),
|
|
IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
|
|
ntohs(ctl_cp->cport));
|
|
|
|
cp->control = NULL;
|
|
if (atomic_read(&ctl_cp->n_control) == 0) {
|
|
IP_VS_ERR_BUF("BUG control DEL with n=0 : "
|
|
"%s:%d to %s:%d\n",
|
|
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
|
|
ntohs(cp->cport),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
|
|
ntohs(cp->vport));
|
|
|
|
return;
|
|
}
|
|
atomic_dec(&ctl_cp->n_control);
|
|
}
|
|
|
|
static inline void
|
|
ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
|
|
{
|
|
if (cp->control) {
|
|
IP_VS_ERR_BUF("request control ADD for already controlled: "
|
|
"%s:%d to %s:%d\n",
|
|
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
|
|
ntohs(cp->cport),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
|
|
ntohs(cp->vport));
|
|
|
|
ip_vs_control_del(cp);
|
|
}
|
|
|
|
IP_VS_DBG_BUF(7, "ADDing control for: "
|
|
"cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
|
|
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
|
|
ntohs(cp->cport),
|
|
IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
|
|
ntohs(ctl_cp->cport));
|
|
|
|
cp->control = ctl_cp;
|
|
atomic_inc(&ctl_cp->n_control);
|
|
}
|
|
|
|
/*
|
|
* IPVS netns init & cleanup functions
|
|
*/
|
|
int ip_vs_estimator_net_init(struct net *net);
|
|
int ip_vs_control_net_init(struct net *net);
|
|
int ip_vs_protocol_net_init(struct net *net);
|
|
int ip_vs_app_net_init(struct net *net);
|
|
int ip_vs_conn_net_init(struct net *net);
|
|
int ip_vs_sync_net_init(struct net *net);
|
|
void ip_vs_conn_net_cleanup(struct net *net);
|
|
void ip_vs_app_net_cleanup(struct net *net);
|
|
void ip_vs_protocol_net_cleanup(struct net *net);
|
|
void ip_vs_control_net_cleanup(struct net *net);
|
|
void ip_vs_estimator_net_cleanup(struct net *net);
|
|
void ip_vs_sync_net_cleanup(struct net *net);
|
|
void ip_vs_service_net_cleanup(struct net *net);
|
|
|
|
/*
|
|
* IPVS application functions
|
|
* (from ip_vs_app.c)
|
|
*/
|
|
#define IP_VS_APP_MAX_PORTS 8
|
|
struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app);
|
|
void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
|
|
int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
void ip_vs_unbind_app(struct ip_vs_conn *cp);
|
|
int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
|
|
__u16 port);
|
|
int ip_vs_app_inc_get(struct ip_vs_app *inc);
|
|
void ip_vs_app_inc_put(struct ip_vs_app *inc);
|
|
|
|
int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
|
|
int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
|
|
|
|
int register_ip_vs_pe(struct ip_vs_pe *pe);
|
|
int unregister_ip_vs_pe(struct ip_vs_pe *pe);
|
|
struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
|
|
struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
|
|
|
|
/*
|
|
* Use a #define to avoid all of module.h just for these trivial ops
|
|
*/
|
|
#define ip_vs_pe_get(pe) \
|
|
if (pe && pe->module) \
|
|
__module_get(pe->module);
|
|
|
|
#define ip_vs_pe_put(pe) \
|
|
if (pe && pe->module) \
|
|
module_put(pe->module);
|
|
|
|
/*
|
|
* IPVS protocol functions (from ip_vs_proto.c)
|
|
*/
|
|
int ip_vs_protocol_init(void);
|
|
void ip_vs_protocol_cleanup(void);
|
|
void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
|
|
int *ip_vs_create_timeout_table(int *table, int size);
|
|
int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
|
|
const char *name, int to);
|
|
void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
|
|
const struct sk_buff *skb, int offset,
|
|
const char *msg);
|
|
|
|
extern struct ip_vs_protocol ip_vs_protocol_tcp;
|
|
extern struct ip_vs_protocol ip_vs_protocol_udp;
|
|
extern struct ip_vs_protocol ip_vs_protocol_icmp;
|
|
extern struct ip_vs_protocol ip_vs_protocol_esp;
|
|
extern struct ip_vs_protocol ip_vs_protocol_ah;
|
|
extern struct ip_vs_protocol ip_vs_protocol_sctp;
|
|
|
|
/*
|
|
* Registering/unregistering scheduler functions
|
|
* (from ip_vs_sched.c)
|
|
*/
|
|
int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
|
|
int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
|
|
int ip_vs_bind_scheduler(struct ip_vs_service *svc,
|
|
struct ip_vs_scheduler *scheduler);
|
|
void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
|
|
struct ip_vs_scheduler *sched);
|
|
struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
|
|
void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
|
|
struct ip_vs_conn *
|
|
ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
|
|
struct ip_vs_proto_data *pd, int *ignored,
|
|
struct ip_vs_iphdr *iph);
|
|
int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
|
|
struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
|
|
|
|
void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
|
|
|
|
|
|
/*
|
|
* IPVS control data and functions (from ip_vs_ctl.c)
|
|
*/
|
|
extern struct ip_vs_stats ip_vs_stats;
|
|
extern int sysctl_ip_vs_sync_ver;
|
|
|
|
struct ip_vs_service *
|
|
ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
|
|
const union nf_inet_addr *vaddr, __be16 vport);
|
|
|
|
bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
|
|
const union nf_inet_addr *daddr, __be16 dport);
|
|
|
|
int ip_vs_use_count_inc(void);
|
|
void ip_vs_use_count_dec(void);
|
|
int ip_vs_register_nl_ioctl(void);
|
|
void ip_vs_unregister_nl_ioctl(void);
|
|
int ip_vs_control_init(void);
|
|
void ip_vs_control_cleanup(void);
|
|
struct ip_vs_dest *
|
|
ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
|
|
__be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
|
|
__u16 protocol, __u32 fwmark, __u32 flags);
|
|
void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
|
|
|
|
static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
|
|
{
|
|
atomic_inc(&dest->refcnt);
|
|
}
|
|
|
|
static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
|
|
{
|
|
smp_mb__before_atomic_dec();
|
|
atomic_dec(&dest->refcnt);
|
|
}
|
|
|
|
static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
|
|
{
|
|
if (atomic_dec_return(&dest->refcnt) < 0)
|
|
kfree(dest);
|
|
}
|
|
|
|
/*
|
|
* IPVS sync daemon data and function prototypes
|
|
* (from ip_vs_sync.c)
|
|
*/
|
|
int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid);
|
|
int stop_sync_thread(struct net *net, int state);
|
|
void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
|
|
|
|
/*
|
|
* IPVS rate estimator prototypes (from ip_vs_est.c)
|
|
*/
|
|
void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
|
|
void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
|
|
void ip_vs_zero_estimator(struct ip_vs_stats *stats);
|
|
void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
|
|
struct ip_vs_stats *stats);
|
|
|
|
/*
|
|
* Various IPVS packet transmitters (from ip_vs_xmit.c)
|
|
*/
|
|
int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
|
|
int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
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struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
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|
int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
|
|
int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
|
|
int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
|
|
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);
|
|
void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
|
|
|
|
#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 *iph);
|
|
int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
|
|
int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
|
|
int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
|
|
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 *iph);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
/*
|
|
* This is a simple mechanism to ignore packets when
|
|
* we are loaded. Just set ip_vs_drop_rate to 'n' and
|
|
* we start to drop 1/rate of the packets
|
|
*/
|
|
|
|
static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
|
|
{
|
|
if (!ipvs->drop_rate)
|
|
return 0;
|
|
if (--ipvs->drop_counter > 0)
|
|
return 0;
|
|
ipvs->drop_counter = ipvs->drop_rate;
|
|
return 1;
|
|
}
|
|
#else
|
|
static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
|
|
#endif
|
|
|
|
/*
|
|
* ip_vs_fwd_tag returns the forwarding tag of the connection
|
|
*/
|
|
#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
|
|
|
|
static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
|
|
{
|
|
char fwd;
|
|
|
|
switch (IP_VS_FWD_METHOD(cp)) {
|
|
case IP_VS_CONN_F_MASQ:
|
|
fwd = 'M'; break;
|
|
case IP_VS_CONN_F_LOCALNODE:
|
|
fwd = 'L'; break;
|
|
case IP_VS_CONN_F_TUNNEL:
|
|
fwd = 'T'; break;
|
|
case IP_VS_CONN_F_DROUTE:
|
|
fwd = 'R'; break;
|
|
case IP_VS_CONN_F_BYPASS:
|
|
fwd = 'B'; break;
|
|
default:
|
|
fwd = '?'; break;
|
|
}
|
|
return fwd;
|
|
}
|
|
|
|
void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
|
|
struct ip_vs_conn *cp, int dir);
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
|
|
struct ip_vs_conn *cp, int dir);
|
|
#endif
|
|
|
|
__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
|
|
|
|
static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
|
|
{
|
|
__be32 diff[2] = { ~old, new };
|
|
|
|
return csum_partial(diff, sizeof(diff), oldsum);
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
|
|
__wsum oldsum)
|
|
{
|
|
__be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
|
|
new[3], new[2], new[1], new[0] };
|
|
|
|
return csum_partial(diff, sizeof(diff), oldsum);
|
|
}
|
|
#endif
|
|
|
|
static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
|
|
{
|
|
__be16 diff[2] = { ~old, new };
|
|
|
|
return csum_partial(diff, sizeof(diff), oldsum);
|
|
}
|
|
|
|
/*
|
|
* Forget current conntrack (unconfirmed) and attach notrack entry
|
|
*/
|
|
static inline void ip_vs_notrack(struct sk_buff *skb)
|
|
{
|
|
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
|
|
enum ip_conntrack_info ctinfo;
|
|
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
|
|
|
|
if (!ct || !nf_ct_is_untracked(ct)) {
|
|
nf_conntrack_put(skb->nfct);
|
|
skb->nfct = &nf_ct_untracked_get()->ct_general;
|
|
skb->nfctinfo = IP_CT_NEW;
|
|
nf_conntrack_get(skb->nfct);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_NFCT
|
|
/*
|
|
* Netfilter connection tracking
|
|
* (from ip_vs_nfct.c)
|
|
*/
|
|
static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
return ipvs->sysctl_conntrack;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
int outin);
|
|
int ip_vs_confirm_conntrack(struct sk_buff *skb);
|
|
void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
|
|
struct ip_vs_conn *cp, u_int8_t proto,
|
|
const __be16 port, int from_rs);
|
|
void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
|
|
|
|
#else
|
|
|
|
static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ip_vs_update_conntrack(struct sk_buff *skb,
|
|
struct ip_vs_conn *cp, int outin)
|
|
{
|
|
}
|
|
|
|
static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
|
|
{
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
|
|
{
|
|
}
|
|
/* CONFIG_IP_VS_NFCT */
|
|
#endif
|
|
|
|
static inline int
|
|
ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
|
|
{
|
|
/*
|
|
* We think the overhead of processing active connections is 256
|
|
* times higher than that of inactive connections in average. (This
|
|
* 256 times might not be accurate, we will change it later) We
|
|
* use the following formula to estimate the overhead now:
|
|
* dest->activeconns*256 + dest->inactconns
|
|
*/
|
|
return (atomic_read(&dest->activeconns) << 8) +
|
|
atomic_read(&dest->inactconns);
|
|
}
|
|
|
|
#endif /* _NET_IP_VS_H */
|