xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

devip: use top bit (type) | subnet-id for V6H() route hash macro

Browse source 
theres no structure in the lower 32 bits of an ipv6 address.

use the top bit to distinguish special stuff like multicast
and link-local addresses, and use the 16-bit subnet-id bits
for the rest.
This commit is contained in:
cinap_lenrek 2021-10-10 14:22:14 +00:00
parent 1a6324970d
commit e687d25478
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
sys/src/9/ip/iproute.c
View file

@ -383,7 +383,7 @@ looknodetag(Route *r, char *tag)
} }
#define V4H(a) ((a&0x07ffffff)>>(32-Lroot-5)) #define V4H(a) ((a&0x07ffffff)>>(32-Lroot-5))
#define V6H(a) (((a)[IPllen-1]&0x07ffffff)>>(32-Lroot-5)) #define V6H(a) (((a)[0]&0x80000000)>>(32-Lroot) | ((a)[(IPllen/2)-1]&(0xffff>>(16-Lroot))))
static void static void
routeadd(Fs *f, Route *r) routeadd(Fs *f, Route *r)