![Julian Anastasov](/assets/img/avatar_default.png)
Avoid full checksum calculation for apps that can provide info whether csum was broken after payload mangling. For now only ip_vs_ftp mangles payload and it updates the csum, so the full recalculation is avoided for all packets. Add CHECKSUM_UNNECESSARY for snat_handler (TCP and UDP). It is needed to support SNAT from local address for the case when csum is fully recalculated. Signed-off-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Simon Horman <horms@verge.net.au>
1069 lines
30 KiB
C
1069 lines
30 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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/* old ipvsadm versions still include this file directly */
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#ifdef __KERNEL__
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#include <asm/types.h> /* for __uXX types */
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#include <linux/sysctl.h> /* for ctl_path */
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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 <asm/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 <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> /* for ipv6_addr_copy */
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#ifdef CONFIG_IP_VS_NFCT
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#include <net/netfilter/nf_conntrack.h>
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#endif
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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 len;
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__u8 protocol;
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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
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ip_vs_fill_iphdr(int af, const void *nh, 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 = nh;
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iphdr->len = sizeof(struct ipv6hdr);
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iphdr->protocol = iph->nexthdr;
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ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
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ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
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} else
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#endif
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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->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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ipv6_addr_copy(&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 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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extern 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, "[%pI6]",
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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, 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(pp, skb, ofs, msg); \
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} while (0)
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#define IP_VS_DBG_RL_PKT(level, 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(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, pp, skb, ofs, msg) do {} while (0)
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#define IP_VS_DBG_RL_PKT(level, 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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#define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
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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_INIT_CLI,
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IP_VS_SCTP_S_INIT_SER,
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IP_VS_SCTP_S_INIT_ACK_CLI,
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IP_VS_SCTP_S_INIT_ACK_SER,
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IP_VS_SCTP_S_ECHO_CLI,
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IP_VS_SCTP_S_ECHO_SER,
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IP_VS_SCTP_S_ESTABLISHED,
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IP_VS_SCTP_S_SHUT_CLI,
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IP_VS_SCTP_S_SHUT_SER,
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IP_VS_SCTP_S_SHUT_ACK_CLI,
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IP_VS_SCTP_S_SHUT_ACK_SER,
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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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* 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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spinlock_t lock; /* spin lock */
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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_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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atomic_t appcnt; /* counter of proto app incs */
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int *timeout_table; /* protocol timeout table */
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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 (*conn_schedule)(int af, struct sk_buff *skb,
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struct ip_vs_protocol *pp,
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int *verdict, struct ip_vs_conn **cpp);
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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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struct ip_vs_protocol *pp,
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const struct ip_vs_iphdr *iph,
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unsigned int proto_off,
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int inverse);
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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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struct ip_vs_protocol *pp,
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const struct ip_vs_iphdr *iph,
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unsigned int proto_off,
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int inverse);
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int (*snat_handler)(struct sk_buff *skb,
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struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
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int (*dnat_handler)(struct sk_buff *skb,
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struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
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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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int (*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_protocol *pp);
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int (*register_app)(struct ip_vs_app *inc);
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void (*unregister_app)(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)(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_protocol *pp, int flags);
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int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
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};
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extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
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struct ip_vs_conn_param {
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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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*/
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struct ip_vs_conn {
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struct list_head c_list; /* hashed list heads */
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/* Protocol, addresses and port numbers */
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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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__be16 cport;
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__be16 vport;
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__be16 dport;
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__u16 protocol; /* Which protocol (TCP/UDP) */
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/* counter and timer */
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atomic_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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/* 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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/* 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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*/
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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);
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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
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only used in VS/NAT anyway */
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struct ip_vs_app *app; /* bound ip_vs_app object */
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void *app_data; /* Application private data */
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struct ip_vs_seq in_seq; /* incoming seq. struct */
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struct ip_vs_seq out_seq; /* outgoing seq. struct */
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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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* Extended internal versions of struct ip_vs_service_user and
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* ip_vs_dest_user for IPv6 support.
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*
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* We need these to conveniently pass around service and destination
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* options, but unfortunately, we also need to keep the old definitions to
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* maintain userspace backwards compatibility for the setsockopt interface.
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*/
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struct ip_vs_service_user_kern {
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/* virtual service addresses */
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u16 af;
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u16 protocol;
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union nf_inet_addr addr; /* virtual ip address */
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u16 port;
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u32 fwmark; /* firwall mark of service */
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/* virtual service options */
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char *sched_name;
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char *pe_name;
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unsigned flags; /* virtual service flags */
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unsigned timeout; /* persistent timeout in sec */
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u32 netmask; /* persistent netmask */
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};
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struct ip_vs_dest_user_kern {
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/* destination server address */
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union nf_inet_addr addr;
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u16 port;
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/* real server options */
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unsigned conn_flags; /* connection flags */
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int weight; /* destination weight */
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/* thresholds for active connections */
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u32 u_threshold; /* upper threshold */
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u32 l_threshold; /* lower threshold */
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};
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/*
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* The information about the virtual service offered to the net
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* and the forwarding entries
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*/
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struct ip_vs_service {
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struct list_head s_list; /* for normal service table */
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struct list_head f_list; /* for fwmark-based service table */
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atomic_t refcnt; /* reference counter */
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atomic_t usecnt; /* use counter */
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u16 af; /* address family */
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__u16 protocol; /* which protocol (TCP/UDP) */
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union nf_inet_addr addr; /* IP address for virtual service */
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__be16 port; /* port number for the service */
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__u32 fwmark; /* firewall mark of the service */
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unsigned flags; /* service status flags */
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unsigned timeout; /* persistent timeout in ticks */
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__be32 netmask; /* grouping granularity */
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struct list_head destinations; /* real server d-linked list */
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__u32 num_dests; /* number of servers */
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struct ip_vs_stats stats; /* statistics for the service */
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struct ip_vs_app *inc; /* bind conns to this app inc */
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/* for scheduling */
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struct ip_vs_scheduler *scheduler; /* bound scheduler object */
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rwlock_t sched_lock; /* lock sched_data */
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void *sched_data; /* scheduler application data */
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/* alternate persistence engine */
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struct ip_vs_pe *pe;
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};
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/*
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* The real server destination forwarding entry
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* with ip address, port number, and so on.
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*/
|
|
struct ip_vs_dest {
|
|
struct list_head n_list; /* for the dests in the service */
|
|
struct list_head d_list; /* for table with all the dests */
|
|
|
|
u16 af; /* address family */
|
|
union nf_inet_addr addr; /* IP address of the server */
|
|
__be16 port; /* port number of the server */
|
|
volatile unsigned 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 */
|
|
|
|
/* 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 dst_entry *dst_cache; /* destination cache entry */
|
|
u32 dst_rtos; /* RT_TOS(tos) for dst */
|
|
u32 dst_cookie;
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
struct in6_addr dst_saddr;
|
|
#endif
|
|
|
|
/* for virtual service */
|
|
struct ip_vs_service *svc; /* service it belongs to */
|
|
__u16 protocol; /* which protocol (TCP/UDP) */
|
|
union nf_inet_addr vaddr; /* virtual IP address */
|
|
__be16 vport; /* virtual port number */
|
|
__u32 vfwmark; /* firewall mark of service */
|
|
};
|
|
|
|
|
|
/*
|
|
* 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 */
|
|
int (*done_service)(struct ip_vs_service *svc);
|
|
/* scheduler updating service */
|
|
int (*update_service)(struct ip_vs_service *svc);
|
|
|
|
/* selecting a server from the given service */
|
|
struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
|
|
const struct sk_buff *skb);
|
|
};
|
|
|
|
/* 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 */
|
|
|
|
/*
|
|
* 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, unsigned int proto_off,
|
|
int inverse);
|
|
|
|
struct ip_vs_conn *
|
|
(*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
|
|
const struct iphdr *iph, unsigned int proto_off,
|
|
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);
|
|
};
|
|
|
|
|
|
/*
|
|
* IPVS core functions
|
|
* (from ip_vs_core.c)
|
|
*/
|
|
extern const char *ip_vs_proto_name(unsigned proto);
|
|
extern 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(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->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,
|
|
struct ip_vs_protocol *pp,
|
|
const struct ip_vs_iphdr *iph,
|
|
unsigned int proto_off,
|
|
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,
|
|
struct ip_vs_protocol *pp,
|
|
const struct ip_vs_iphdr *iph,
|
|
unsigned int proto_off,
|
|
int inverse);
|
|
|
|
/* put back the conn without restarting its timer */
|
|
static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
|
|
{
|
|
atomic_dec(&cp->refcnt);
|
|
}
|
|
extern void ip_vs_conn_put(struct ip_vs_conn *cp);
|
|
extern 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 flags,
|
|
struct ip_vs_dest *dest);
|
|
extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
|
|
|
|
extern const char * ip_vs_state_name(__u16 proto, int state);
|
|
|
|
extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
|
|
extern int ip_vs_check_template(struct ip_vs_conn *ct);
|
|
extern void ip_vs_random_dropentry(void);
|
|
extern int ip_vs_conn_init(void);
|
|
extern 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 application functions
|
|
* (from ip_vs_app.c)
|
|
*/
|
|
#define IP_VS_APP_MAX_PORTS 8
|
|
extern int register_ip_vs_app(struct ip_vs_app *app);
|
|
extern void unregister_ip_vs_app(struct ip_vs_app *app);
|
|
extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
|
|
extern int
|
|
register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
|
|
extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
|
|
extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
|
|
|
|
extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
|
|
extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
|
|
extern int ip_vs_app_init(void);
|
|
extern void ip_vs_app_cleanup(void);
|
|
|
|
void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
|
|
void ip_vs_unbind_pe(struct ip_vs_service *svc);
|
|
int register_ip_vs_pe(struct ip_vs_pe *pe);
|
|
int unregister_ip_vs_pe(struct ip_vs_pe *pe);
|
|
extern struct ip_vs_pe *ip_vs_pe_get(const char *name);
|
|
extern void ip_vs_pe_put(struct ip_vs_pe *pe);
|
|
|
|
/*
|
|
* IPVS protocol functions (from ip_vs_proto.c)
|
|
*/
|
|
extern int ip_vs_protocol_init(void);
|
|
extern void ip_vs_protocol_cleanup(void);
|
|
extern void ip_vs_protocol_timeout_change(int flags);
|
|
extern int *ip_vs_create_timeout_table(int *table, int size);
|
|
extern int
|
|
ip_vs_set_state_timeout(int *table, int num, const char *const *names,
|
|
const char *name, int to);
|
|
extern void
|
|
ip_vs_tcpudp_debug_packet(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)
|
|
*/
|
|
extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
|
|
extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
|
|
extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
|
|
struct ip_vs_scheduler *scheduler);
|
|
extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
|
|
extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
|
|
extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
|
|
extern struct ip_vs_conn *
|
|
ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb);
|
|
extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
|
|
struct ip_vs_protocol *pp);
|
|
|
|
|
|
/*
|
|
* IPVS control data and functions (from ip_vs_ctl.c)
|
|
*/
|
|
extern int sysctl_ip_vs_cache_bypass;
|
|
extern int sysctl_ip_vs_expire_nodest_conn;
|
|
extern int sysctl_ip_vs_expire_quiescent_template;
|
|
extern int sysctl_ip_vs_sync_threshold[2];
|
|
extern int sysctl_ip_vs_nat_icmp_send;
|
|
extern int sysctl_ip_vs_conntrack;
|
|
extern int sysctl_ip_vs_snat_reroute;
|
|
extern struct ip_vs_stats ip_vs_stats;
|
|
extern const struct ctl_path net_vs_ctl_path[];
|
|
|
|
extern struct ip_vs_service *
|
|
ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
|
|
const union nf_inet_addr *vaddr, __be16 vport);
|
|
|
|
static inline void ip_vs_service_put(struct ip_vs_service *svc)
|
|
{
|
|
atomic_dec(&svc->usecnt);
|
|
}
|
|
|
|
extern struct ip_vs_dest *
|
|
ip_vs_lookup_real_service(int af, __u16 protocol,
|
|
const union nf_inet_addr *daddr, __be16 dport);
|
|
|
|
extern int ip_vs_use_count_inc(void);
|
|
extern void ip_vs_use_count_dec(void);
|
|
extern int ip_vs_control_init(void);
|
|
extern void ip_vs_control_cleanup(void);
|
|
extern struct ip_vs_dest *
|
|
ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
|
|
const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
|
|
extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
|
|
|
|
|
|
/*
|
|
* IPVS sync daemon data and function prototypes
|
|
* (from ip_vs_sync.c)
|
|
*/
|
|
extern volatile int ip_vs_sync_state;
|
|
extern volatile int ip_vs_master_syncid;
|
|
extern volatile int ip_vs_backup_syncid;
|
|
extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
|
|
extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
|
|
extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
|
|
extern int stop_sync_thread(int state);
|
|
extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
|
|
|
|
|
|
/*
|
|
* IPVS rate estimator prototypes (from ip_vs_est.c)
|
|
*/
|
|
extern int ip_vs_estimator_init(void);
|
|
extern void ip_vs_estimator_cleanup(void);
|
|
extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
|
|
extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
|
|
extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
|
|
|
|
/*
|
|
* Various IPVS packet transmitters (from ip_vs_xmit.c)
|
|
*/
|
|
extern int ip_vs_null_xmit
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_bypass_xmit
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_nat_xmit
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_tunnel_xmit
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_dr_xmit
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_icmp_xmit
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
|
|
extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
extern int ip_vs_bypass_xmit_v6
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_nat_xmit_v6
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_tunnel_xmit_v6
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_dr_xmit_v6
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
|
|
extern int ip_vs_icmp_xmit_v6
|
|
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
|
|
int offset);
|
|
#endif
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
extern int ip_vs_drop_rate;
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extern int ip_vs_drop_counter;
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static __inline__ int ip_vs_todrop(void)
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{
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if (!ip_vs_drop_rate) return 0;
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if (--ip_vs_drop_counter > 0) return 0;
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ip_vs_drop_counter = ip_vs_drop_rate;
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return 1;
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}
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/*
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* ip_vs_fwd_tag returns the forwarding tag of the connection
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*/
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#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
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static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
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{
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char fwd;
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switch (IP_VS_FWD_METHOD(cp)) {
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case IP_VS_CONN_F_MASQ:
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fwd = 'M'; break;
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case IP_VS_CONN_F_LOCALNODE:
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fwd = 'L'; break;
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case IP_VS_CONN_F_TUNNEL:
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fwd = 'T'; break;
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case IP_VS_CONN_F_DROUTE:
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fwd = 'R'; break;
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case IP_VS_CONN_F_BYPASS:
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fwd = 'B'; break;
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default:
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fwd = '?'; break;
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}
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return fwd;
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}
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|
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extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
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struct ip_vs_conn *cp, int dir);
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|
|
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#ifdef CONFIG_IP_VS_IPV6
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extern 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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extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
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|
|
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static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
|
|
{
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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,
|
|
__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);
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_NFCT
|
|
/*
|
|
* Netfilter connection tracking
|
|
* (from ip_vs_nfct.c)
|
|
*/
|
|
static inline int ip_vs_conntrack_enabled(void)
|
|
{
|
|
return sysctl_ip_vs_conntrack;
|
|
}
|
|
|
|
extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
|
|
int outin);
|
|
extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
|
|
extern 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);
|
|
extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
|
|
|
|
#else
|
|
|
|
static inline int ip_vs_conntrack_enabled(void)
|
|
{
|
|
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,
|
|
struct ip_vs_conn *cp)
|
|
{
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
|
|
{
|
|
}
|
|
/* CONFIG_IP_VS_NFCT */
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _NET_IP_VS_H */
|