YCLin的ip_vs_cad_hash_init()

ip_vs_cad_hash_init():
 用來讀/boot/hot_in檔案,並且vmalloc空間存放讀進來的資料.
location: ip_vs_cad.c
referenced: In function ip_vs_bind_scheduler()


ip_vs_bind_scheduler(struct ip_vs_service *, struct ip_vs_scheduler *):
 用來加入新的scheduler. (ex. lard,wrr,wlc...)
location: ip_vs_sched.c
referenced: In function ip_vs_add_service()


ip_vs_add_service(struct ip_vs_rule_user *ur, struct ip_vs_service **svc_p):
 用來加入service, 先用ur->sched_name找scheduler,
 再用ip_vs_bind_scheduler綁起來...
location: ip_vs_ctl.c
referenced: do_ip_vs_set_ctl()


do_ip_vs_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len):
 不明＠＠.. 待check...
 裡面有一堆case:
 據說是dispatcher的主函式


TODO: nf_sockopt_ops

jhash

Kernel version: 2.6.18
/include/linux/jhash.h

Code:

/* A special ultra-optimized versions that knows they are hashing exactly
 * 3, 2 or 1 word(s).
 *
 * NOTE: In partilar the "c += length; __jhash_mix(a,b,c);" normally
 *       done at the end is not done here.
 */
static inline u32 jhash_3words(u32 a, u32 b, u32 c, u32 initval)
{
        a += JHASH_GOLDEN_RATIO;
        b += JHASH_GOLDEN_RATIO;
        c += initval;

        __jhash_mix(a, b, c);

        return c;
}

Usage:

/*
 *      Returns hash value for IPVS connection entry
 */
static unsigned int ip_vs_conn_hashkey(unsigned proto, __u32 addr, __u16 port)
{
        return jhash_3words(addr, port, proto, ip_vs_conn_rnd)
                & IP_VS_CONN_TAB_MASK;
}

ip_vs_conn_rnd:
 Initialize at ip_vs_conn_init(void).
 Randon value of static unsigned int.

IP_VS_CONN_TAB_MASK: (4098)
 Defined in ip_vs.h
#define CONFIG_IP_VS_TAB_BITS   12 //default
#define IP_VS_CONN_TAB_BITS     CONFIG_IP_VS_TAB_BITS
#define IP_VS_CONN_TAB_SIZE     (1 << IP_VS_CONN_TAB_BITS)
#define IP_VS_CONN_TAB_MASK     (IP_VS_CONN_TAB_SIZE - 1)