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1726 lines
49 KiB
1726 lines
49 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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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/refcount.h> /* for struct refcount_t */ |
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#include <linux/workqueue.h> |
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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_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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#define IP_VS_HDR_INVERSE 1 |
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#define IP_VS_HDR_ICMP 2 |
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/* Generic access of ipvs struct */ |
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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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/* 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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int hdr_flags; /* ipvs flags */ |
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__u32 off; /* Where IP or IPv4 header starts */ |
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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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{ |
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return skb_header_pointer(skb, offset, len, buffer); |
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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 int |
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ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset, |
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int hdr_flags, struct ip_vs_iphdr *iphdr) |
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{ |
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iphdr->hdr_flags = hdr_flags; |
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iphdr->off = offset; |
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#ifdef CONFIG_IP_VS_IPV6 |
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if (af == AF_INET6) { |
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struct ipv6hdr _iph; |
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const struct ipv6hdr *iph = skb_header_pointer( |
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skb, offset, sizeof(_iph), &_iph); |
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if (!iph) |
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return 0; |
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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 = offset; |
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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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if (iphdr->protocol < 0) |
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return 0; |
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} else |
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#endif |
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{ |
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struct iphdr _iph; |
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const struct iphdr *iph = skb_header_pointer( |
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skb, offset, sizeof(_iph), &_iph); |
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if (!iph) |
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return 0; |
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iphdr->len = offset + 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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return 1; |
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} |
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static inline int |
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ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset, |
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bool inverse, struct ip_vs_iphdr *iphdr) |
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{ |
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int hdr_flags = IP_VS_HDR_ICMP; |
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if (inverse) |
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hdr_flags |= IP_VS_HDR_INVERSE; |
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return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr); |
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} |
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static inline int |
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ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse, |
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struct ip_vs_iphdr *iphdr) |
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{ |
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int hdr_flags = 0; |
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if (inverse) |
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hdr_flags |= IP_VS_HDR_INVERSE; |
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return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb), |
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hdr_flags, iphdr); |
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} |
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static inline bool |
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ip_vs_iph_inverse(const struct ip_vs_iphdr *iph) |
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{ |
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return !!(iph->hdr_flags & IP_VS_HDR_INVERSE); |
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} |
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static inline bool |
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ip_vs_iph_icmp(const struct ip_vs_iphdr *iph) |
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{ |
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return !!(iph->hdr_flags & IP_VS_HDR_ICMP); |
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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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/* The port number of FTP service (in network order). */ |
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#define FTPPORT cpu_to_be16(21) |
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#define FTPDATA cpu_to_be16(20) |
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/* TCP State Values */ |
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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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/* UDP State Values */ |
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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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/* ICMP State Values */ |
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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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/* SCTP State Values */ |
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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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/* Connection templates use bits from state */ |
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#define IP_VS_CTPL_S_NONE 0x0000 |
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#define IP_VS_CTPL_S_ASSURED 0x0001 |
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#define IP_VS_CTPL_S_LAST 0x0002 |
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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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/* counters per cpu */ |
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struct ip_vs_counters { |
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__u64 conns; /* connections scheduled */ |
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__u64 inpkts; /* incoming packets */ |
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__u64 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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/* Stats per cpu */ |
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struct ip_vs_cpu_stats { |
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struct ip_vs_counters cnt; |
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struct u64_stats_sync syncp; |
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}; |
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/* IPVS statistics objects */ |
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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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u64 last_conns; |
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u64 last_inpkts; |
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u64 last_outpkts; |
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u64 cps; |
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u64 inpps; |
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u64 outpps; |
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u64 inbps; |
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u64 outbps; |
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}; |
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/* |
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* IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user |
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*/ |
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struct ip_vs_kstats { |
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u64 conns; /* connections scheduled */ |
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u64 inpkts; /* incoming packets */ |
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u64 outpkts; /* outgoing packets */ |
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u64 inbytes; /* incoming bytes */ |
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u64 outbytes; /* outgoing bytes */ |
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u64 cps; /* current connection rate */ |
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u64 inpps; /* current in packet rate */ |
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u64 outpps; /* current out packet rate */ |
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u64 inbps; /* current in byte rate */ |
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u64 outbps; /* current out byte rate */ |
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}; |
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struct ip_vs_stats { |
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struct ip_vs_kstats kstats; /* kernel 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_kstats kstats0; /* 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 netns_ipvs *ipvs, struct ip_vs_proto_data *pd); |
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void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); |
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int (*conn_schedule)(struct netns_ipvs *ipvs, |
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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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struct ip_vs_conn * |
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(*conn_in_get)(struct netns_ipvs *ipvs, |
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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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struct ip_vs_conn * |
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(*conn_out_get)(struct netns_ipvs *ipvs, |
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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 (*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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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, |
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struct ip_vs_proto_data *pd); |
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int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc); |
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void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc); |
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int (*app_conn_bind)(struct ip_vs_conn *cp); |
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void (*debug_packet)(int af, struct ip_vs_protocol *pp, |
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const struct sk_buff *skb, |
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int offset, |
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const char *msg); |
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void (*timeout_change)(struct ip_vs_proto_data *pd, int flags); |
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}; |
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/* protocol data per netns */ |
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struct ip_vs_proto_data { |
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struct ip_vs_proto_data *next; |
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struct ip_vs_protocol *pp; |
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int *timeout_table; /* protocol timeout table */ |
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atomic_t appcnt; /* counter of proto app incs. */ |
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struct tcp_states_t *tcp_state_table; |
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}; |
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struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); |
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struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs, |
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unsigned short proto); |
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struct ip_vs_conn_param { |
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struct netns_ipvs *ipvs; |
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const union nf_inet_addr *caddr; |
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const union nf_inet_addr *vaddr; |
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__be16 cport; |
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__be16 vport; |
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__u16 protocol; |
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u16 af; |
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const struct ip_vs_pe *pe; |
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char *pe_data; |
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__u8 pe_data_len; |
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}; |
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|
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/* IP_VS structure allocated for each dynamically scheduled connection */ |
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struct ip_vs_conn { |
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struct hlist_node c_list; /* hashed list heads */ |
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/* Protocol, addresses and port numbers */ |
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__be16 cport; |
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__be16 dport; |
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__be16 vport; |
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u16 af; /* address family */ |
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union nf_inet_addr caddr; /* client address */ |
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union nf_inet_addr vaddr; /* virtual address */ |
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union nf_inet_addr daddr; /* destination address */ |
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volatile __u32 flags; /* status flags */ |
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__u16 protocol; /* Which protocol (TCP/UDP) */ |
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__u16 daf; /* Address family of the dest */ |
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struct netns_ipvs *ipvs; |
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|
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/* counter and timer */ |
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refcount_t refcnt; /* reference count */ |
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struct timer_list timer; /* Expiration timer */ |
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volatile unsigned long timeout; /* timeout */ |
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/* Flags and state transition */ |
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spinlock_t lock; /* lock for state transition */ |
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volatile __u16 state; /* state info */ |
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volatile __u16 old_state; /* old state, to be used for |
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* state transition triggerd |
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* synchronization |
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*/ |
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__u32 fwmark; /* Fire wall mark from skb */ |
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unsigned long sync_endtime; /* jiffies + sent_retries */ |
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|
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/* Control members */ |
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struct ip_vs_conn *control; /* Master control connection */ |
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atomic_t n_control; /* Number of controlled ones */ |
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struct ip_vs_dest *dest; /* real server */ |
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atomic_t in_pkts; /* incoming packet counter */ |
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|
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/* Packet transmitter for different forwarding methods. If it |
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* mangles the packet, it must return NF_DROP or better NF_STOLEN, |
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* otherwise this must be changed to a sk_buff **. |
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* NF_ACCEPT can be returned when destination is local. |
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*/ |
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int (*packet_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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|
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/* Note: we can group the following members into a structure, |
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* 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; |
|
}; |
|
|
|
/* 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 */ |
|
|
|
/* Address family of addr */ |
|
u16 af; |
|
|
|
u16 tun_type; /* tunnel type */ |
|
__be16 tun_port; /* tunnel port */ |
|
u16 tun_flags; /* tunnel flags */ |
|
}; |
|
|
|
|
|
/* |
|
* 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 netns_ipvs *ipvs; |
|
|
|
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; |
|
int conntrack_afmask; |
|
|
|
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 last_weight; /* server latest weight */ |
|
__u16 tun_type; /* tunnel type */ |
|
__be16 tun_port; /* tunnel port */ |
|
__u16 tun_flags; /* tunnel flags */ |
|
|
|
refcount_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); |
|
/* create connections for real-server outgoing packets */ |
|
struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc, |
|
struct ip_vs_dest *dest, |
|
struct sk_buff *skb, |
|
const struct ip_vs_iphdr *iph, |
|
__be16 dport, __be16 cport); |
|
}; |
|
|
|
/* 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, struct ip_vs_iphdr *ipvsh); |
|
|
|
/* 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, struct ip_vs_iphdr *ipvsh); |
|
|
|
/* 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 delayed_work master_wakeup_work; |
|
struct netns_ipvs *ipvs; |
|
}; |
|
|
|
struct ip_vs_sync_thread_data; |
|
|
|
/* How much time to keep dests in trash */ |
|
#define IP_VS_DEST_TRASH_PERIOD (120 * HZ) |
|
|
|
struct ipvs_sync_daemon_cfg { |
|
union nf_inet_addr mcast_group; |
|
int syncid; |
|
u16 sync_maxlen; |
|
u16 mcast_port; |
|
u8 mcast_af; |
|
u8 mcast_ttl; |
|
/* multicast interface name */ |
|
char mcast_ifn[IP_VS_IFNAME_MAXLEN]; |
|
}; |
|
|
|
/* 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 */ |
|
int num_services6; /* IPv6 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; |
|
atomic_t conn_out_counter; |
|
|
|
#ifdef CONFIG_SYSCTL |
|
/* delayed work for expiring no dest connections */ |
|
struct delayed_work expire_nodest_conn_work; |
|
/* 1/rate drop and drop-entry variables */ |
|
struct delayed_work defense_work; /* Work handler */ |
|
int drop_rate; |
|
int drop_counter; |
|
int old_secure_tcp; |
|
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; |
|
int sysctl_conn_reuse_mode; |
|
int sysctl_schedule_icmp; |
|
int sysctl_ignore_tunneled; |
|
|
|
/* 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 ip_vs_sync_thread_data *master_tinfo; |
|
struct ip_vs_sync_thread_data *backup_tinfo; |
|
int threads_mask; |
|
volatile int sync_state; |
|
struct mutex sync_mutex; |
|
struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */ |
|
struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */ |
|
/* net name space ptr */ |
|
struct net *net; /* Needed by timer routines */ |
|
/* Number of heterogeneous destinations, needed becaus heterogeneous |
|
* are not supported when synchronization is enabled. |
|
*/ |
|
unsigned int mixed_address_family_dests; |
|
unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */ |
|
}; |
|
|
|
#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 READ_ONCE(ipvs->sysctl_sync_threshold[1]); |
|
} |
|
|
|
static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) |
|
{ |
|
return READ_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 READ_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; |
|
} |
|
|
|
static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) |
|
{ |
|
return ipvs->sysctl_conn_reuse_mode; |
|
} |
|
|
|
static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) |
|
{ |
|
return ipvs->sysctl_expire_nodest_conn; |
|
} |
|
|
|
static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) |
|
{ |
|
return ipvs->sysctl_schedule_icmp; |
|
} |
|
|
|
static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) |
|
{ |
|
return ipvs->sysctl_ignore_tunneled; |
|
} |
|
|
|
static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) |
|
{ |
|
return ipvs->sysctl_cache_bypass; |
|
} |
|
|
|
#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; |
|
} |
|
|
|
static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) |
|
{ |
|
return 1; |
|
} |
|
|
|
static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int sysctl_cache_bypass(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); |
|
struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc, |
|
struct ip_vs_dest *dest, |
|
struct sk_buff *skb, |
|
const struct ip_vs_iphdr *iph, |
|
__be16 dport, |
|
__be16 cport); |
|
#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 netns_ipvs *ipvs, 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->ipvs = ipvs; |
|
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(struct netns_ipvs *ipvs, int af, |
|
const struct sk_buff *skb, |
|
const struct ip_vs_iphdr *iph); |
|
|
|
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(struct netns_ipvs *ipvs, int af, |
|
const struct sk_buff *skb, |
|
const struct ip_vs_iphdr *iph); |
|
|
|
/* 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 refcount_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(); |
|
refcount_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, int dest_af, |
|
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(const struct ip_vs_conn *cp); |
|
|
|
void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); |
|
int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest); |
|
void ip_vs_random_dropentry(struct netns_ipvs *ipvs); |
|
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); |
|
} |
|
|
|
/* Mark our template as assured */ |
|
static inline void |
|
ip_vs_control_assure_ct(struct ip_vs_conn *cp) |
|
{ |
|
struct ip_vs_conn *ct = cp->control; |
|
|
|
if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) && |
|
(ct->flags & IP_VS_CONN_F_TEMPLATE)) |
|
ct->state |= IP_VS_CTPL_S_ASSURED; |
|
} |
|
|
|
/* IPVS netns init & cleanup functions */ |
|
int ip_vs_estimator_net_init(struct netns_ipvs *ipvs); |
|
int ip_vs_control_net_init(struct netns_ipvs *ipvs); |
|
int ip_vs_protocol_net_init(struct netns_ipvs *ipvs); |
|
int ip_vs_app_net_init(struct netns_ipvs *ipvs); |
|
int ip_vs_conn_net_init(struct netns_ipvs *ipvs); |
|
int ip_vs_sync_net_init(struct netns_ipvs *ipvs); |
|
void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs); |
|
void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs); |
|
void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs); |
|
void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs); |
|
void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs); |
|
void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs); |
|
void ip_vs_service_nets_cleanup(struct list_head *net_list); |
|
|
|
/* IPVS application functions |
|
* (from ip_vs_app.c) |
|
*/ |
|
#define IP_VS_APP_MAX_PORTS 8 |
|
struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); |
|
void unregister_ip_vs_app(struct netns_ipvs *ipvs, 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 netns_ipvs *ipvs, 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, |
|
struct ip_vs_iphdr *ipvsh); |
|
int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb, |
|
struct ip_vs_iphdr *ipvsh); |
|
|
|
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); |
|
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 netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol, |
|
const union nf_inet_addr *vaddr, __be16 vport); |
|
|
|
bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, |
|
const union nf_inet_addr *daddr, __be16 dport); |
|
|
|
struct ip_vs_dest * |
|
ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, |
|
const union nf_inet_addr *daddr, __be16 dport); |
|
struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af, |
|
const union nf_inet_addr *daddr, |
|
__be16 tun_port); |
|
|
|
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 netns_ipvs *ipvs, int svc_af, int dest_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) |
|
{ |
|
refcount_inc(&dest->refcnt); |
|
} |
|
|
|
static inline void ip_vs_dest_put(struct ip_vs_dest *dest) |
|
{ |
|
smp_mb__before_atomic(); |
|
refcount_dec(&dest->refcnt); |
|
} |
|
|
|
static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest) |
|
{ |
|
if (refcount_dec_and_test(&dest->refcnt)) |
|
kfree(dest); |
|
} |
|
|
|
/* IPVS sync daemon data and function prototypes |
|
* (from ip_vs_sync.c) |
|
*/ |
|
int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg, |
|
int state); |
|
int stop_sync_thread(struct netns_ipvs *ipvs, int state); |
|
void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts); |
|
|
|
/* IPVS rate estimator prototypes (from ip_vs_est.c) */ |
|
void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); |
|
void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); |
|
void ip_vs_zero_estimator(struct ip_vs_stats *stats); |
|
void ip_vs_read_estimator(struct ip_vs_kstats *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, |
|
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); |
|
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 |
|
|
|
#ifdef CONFIG_SYSCTL |
|
/* Enqueue delayed work for expiring no dest connections |
|
* Only run when sysctl_expire_nodest=1 |
|
*/ |
|
static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) |
|
{ |
|
if (sysctl_expire_nodest_conn(ipvs)) |
|
queue_delayed_work(system_long_wq, |
|
&ipvs->expire_nodest_conn_work, 1); |
|
} |
|
|
|
void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs); |
|
#else |
|
static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {} |
|
#endif |
|
|
|
#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \ |
|
IP_VS_CONN_F_FWD_MASK) |
|
|
|
/* 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, |
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struct ip_vs_conn *cp, int dir); |
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#endif |
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__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); |
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static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) |
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{ |
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__be32 diff[2] = { ~old, new }; |
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return csum_partial(diff, sizeof(diff), oldsum); |
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} |
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#ifdef CONFIG_IP_VS_IPV6 |
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static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, |
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__wsum oldsum) |
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{ |
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__be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], |
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new[3], new[2], new[1], new[0] }; |
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return csum_partial(diff, sizeof(diff), oldsum); |
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} |
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#endif |
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static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) |
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{ |
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__be16 diff[2] = { ~old, new }; |
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return csum_partial(diff, sizeof(diff), oldsum); |
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} |
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/* Forget current conntrack (unconfirmed) and attach notrack entry */ |
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static inline void ip_vs_notrack(struct sk_buff *skb) |
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{ |
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#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
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enum ip_conntrack_info ctinfo; |
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struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
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if (ct) { |
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nf_conntrack_put(&ct->ct_general); |
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nf_ct_set(skb, NULL, IP_CT_UNTRACKED); |
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} |
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#endif |
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} |
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#ifdef CONFIG_IP_VS_NFCT |
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/* Netfilter connection tracking |
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* (from ip_vs_nfct.c) |
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*/ |
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static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) |
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{ |
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#ifdef CONFIG_SYSCTL |
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return ipvs->sysctl_conntrack; |
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#else |
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return 0; |
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#endif |
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} |
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void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, |
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int outin); |
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int ip_vs_confirm_conntrack(struct sk_buff *skb); |
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void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, |
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struct ip_vs_conn *cp, u_int8_t proto, |
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const __be16 port, int from_rs); |
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void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); |
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#else |
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static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) |
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{ |
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return 0; |
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} |
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static inline void ip_vs_update_conntrack(struct sk_buff *skb, |
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struct ip_vs_conn *cp, int outin) |
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{ |
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} |
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static inline int ip_vs_confirm_conntrack(struct sk_buff *skb) |
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{ |
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return NF_ACCEPT; |
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} |
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static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) |
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{ |
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} |
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#endif /* CONFIG_IP_VS_NFCT */ |
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/* Using old conntrack that can not be redirected to another real server? */ |
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static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp, |
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struct sk_buff *skb) |
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{ |
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#ifdef CONFIG_IP_VS_NFCT |
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enum ip_conntrack_info ctinfo; |
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struct nf_conn *ct; |
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ct = nf_ct_get(skb, &ctinfo); |
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if (ct && nf_ct_is_confirmed(ct)) |
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return true; |
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#endif |
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return false; |
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} |
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static inline int ip_vs_register_conntrack(struct ip_vs_service *svc) |
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{ |
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#if IS_ENABLED(CONFIG_NF_CONNTRACK) |
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int afmask = (svc->af == AF_INET6) ? 2 : 1; |
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int ret = 0; |
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if (!(svc->conntrack_afmask & afmask)) { |
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ret = nf_ct_netns_get(svc->ipvs->net, svc->af); |
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if (ret >= 0) |
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svc->conntrack_afmask |= afmask; |
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} |
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return ret; |
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#else |
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return 0; |
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#endif |
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} |
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static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc) |
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{ |
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#if IS_ENABLED(CONFIG_NF_CONNTRACK) |
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int afmask = (svc->af == AF_INET6) ? 2 : 1; |
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if (svc->conntrack_afmask & afmask) { |
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nf_ct_netns_put(svc->ipvs->net, svc->af); |
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svc->conntrack_afmask &= ~afmask; |
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} |
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#endif |
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} |
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int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af); |
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void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af); |
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static inline int |
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ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) |
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{ |
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/* We think the overhead of processing active connections is 256 |
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* times higher than that of inactive connections in average. (This |
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* 256 times might not be accurate, we will change it later) We |
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* use the following formula to estimate the overhead now: |
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* dest->activeconns*256 + dest->inactconns |
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*/ |
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return (atomic_read(&dest->activeconns) << 8) + |
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atomic_read(&dest->inactconns); |
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} |
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#ifdef CONFIG_IP_VS_PROTO_TCP |
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INDIRECT_CALLABLE_DECLARE(int |
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tcp_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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#endif |
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#ifdef CONFIG_IP_VS_PROTO_UDP |
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INDIRECT_CALLABLE_DECLARE(int |
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udp_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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#endif |
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#endif /* _NET_IP_VS_H */
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