linux-stable/net/ceph/crush/hash.c
Alexander A. Klimov 94f17c00d6 libceph: replace HTTP links with HTTPS ones
Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.

[ idryomov: Do the same for the CRUSH paper and replace
  ceph.newdream.net with ceph.io. ]

Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2020-08-03 11:05:26 +02:00

152 lines
3.2 KiB
C

// SPDX-License-Identifier: GPL-2.0
#ifdef __KERNEL__
# include <linux/crush/hash.h>
#else
# include "hash.h"
#endif
/*
* Robert Jenkins' function for mixing 32-bit values
* https://burtleburtle.net/bob/hash/evahash.html
* a, b = random bits, c = input and output
*/
#define crush_hashmix(a, b, c) do { \
a = a-b; a = a-c; a = a^(c>>13); \
b = b-c; b = b-a; b = b^(a<<8); \
c = c-a; c = c-b; c = c^(b>>13); \
a = a-b; a = a-c; a = a^(c>>12); \
b = b-c; b = b-a; b = b^(a<<16); \
c = c-a; c = c-b; c = c^(b>>5); \
a = a-b; a = a-c; a = a^(c>>3); \
b = b-c; b = b-a; b = b^(a<<10); \
c = c-a; c = c-b; c = c^(b>>15); \
} while (0)
#define crush_hash_seed 1315423911
static __u32 crush_hash32_rjenkins1(__u32 a)
{
__u32 hash = crush_hash_seed ^ a;
__u32 b = a;
__u32 x = 231232;
__u32 y = 1232;
crush_hashmix(b, x, hash);
crush_hashmix(y, a, hash);
return hash;
}
static __u32 crush_hash32_rjenkins1_2(__u32 a, __u32 b)
{
__u32 hash = crush_hash_seed ^ a ^ b;
__u32 x = 231232;
__u32 y = 1232;
crush_hashmix(a, b, hash);
crush_hashmix(x, a, hash);
crush_hashmix(b, y, hash);
return hash;
}
static __u32 crush_hash32_rjenkins1_3(__u32 a, __u32 b, __u32 c)
{
__u32 hash = crush_hash_seed ^ a ^ b ^ c;
__u32 x = 231232;
__u32 y = 1232;
crush_hashmix(a, b, hash);
crush_hashmix(c, x, hash);
crush_hashmix(y, a, hash);
crush_hashmix(b, x, hash);
crush_hashmix(y, c, hash);
return hash;
}
static __u32 crush_hash32_rjenkins1_4(__u32 a, __u32 b, __u32 c, __u32 d)
{
__u32 hash = crush_hash_seed ^ a ^ b ^ c ^ d;
__u32 x = 231232;
__u32 y = 1232;
crush_hashmix(a, b, hash);
crush_hashmix(c, d, hash);
crush_hashmix(a, x, hash);
crush_hashmix(y, b, hash);
crush_hashmix(c, x, hash);
crush_hashmix(y, d, hash);
return hash;
}
static __u32 crush_hash32_rjenkins1_5(__u32 a, __u32 b, __u32 c, __u32 d,
__u32 e)
{
__u32 hash = crush_hash_seed ^ a ^ b ^ c ^ d ^ e;
__u32 x = 231232;
__u32 y = 1232;
crush_hashmix(a, b, hash);
crush_hashmix(c, d, hash);
crush_hashmix(e, x, hash);
crush_hashmix(y, a, hash);
crush_hashmix(b, x, hash);
crush_hashmix(y, c, hash);
crush_hashmix(d, x, hash);
crush_hashmix(y, e, hash);
return hash;
}
__u32 crush_hash32(int type, __u32 a)
{
switch (type) {
case CRUSH_HASH_RJENKINS1:
return crush_hash32_rjenkins1(a);
default:
return 0;
}
}
__u32 crush_hash32_2(int type, __u32 a, __u32 b)
{
switch (type) {
case CRUSH_HASH_RJENKINS1:
return crush_hash32_rjenkins1_2(a, b);
default:
return 0;
}
}
__u32 crush_hash32_3(int type, __u32 a, __u32 b, __u32 c)
{
switch (type) {
case CRUSH_HASH_RJENKINS1:
return crush_hash32_rjenkins1_3(a, b, c);
default:
return 0;
}
}
__u32 crush_hash32_4(int type, __u32 a, __u32 b, __u32 c, __u32 d)
{
switch (type) {
case CRUSH_HASH_RJENKINS1:
return crush_hash32_rjenkins1_4(a, b, c, d);
default:
return 0;
}
}
__u32 crush_hash32_5(int type, __u32 a, __u32 b, __u32 c, __u32 d, __u32 e)
{
switch (type) {
case CRUSH_HASH_RJENKINS1:
return crush_hash32_rjenkins1_5(a, b, c, d, e);
default:
return 0;
}
}
const char *crush_hash_name(int type)
{
switch (type) {
case CRUSH_HASH_RJENKINS1:
return "rjenkins1";
default:
return "unknown";
}
}