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Tools: hv: Represent the ipv6 mask using CIDR notation

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Transform ipv6 subnet information to CIDR notation.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2012-08-16 18:32:17 -07:00 committed by Greg Kroah-Hartman
parent 0440578459
commit 6a60a6a8ea
1 changed files with 36 additions and 10 deletions
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46
tools/hv/hv_kvp_daemon.c
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@ -491,6 +491,15 @@ done:
return;
}
static unsigned int hweight32(unsigned int *w)
{
unsigned int res = *w - ((*w >> 1) & 0x55555555);
res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
res = (res + (res >> 4)) & 0x0F0F0F0F;
res = res + (res >> 8);
return (res + (res >> 16)) & 0x000000FF;
}
static int kvp_process_ip_address(void *addrp,
int family, char *buffer,
int length, int *offset)
@ -535,10 +544,15 @@ kvp_get_ip_address(int family, char *if_name, int op,
struct ifaddrs *curp;
int offset = 0;
int sn_offset = 0;
const char *str;
int error = 0;
char *buffer;
struct hv_kvp_ipaddr_value *ip_buffer;
char cidr_mask[5]; /* /xyz */
int weight;
int i;
unsigned int *w;
char *sn_str;
struct sockaddr_in6 *addr6;
if (op == KVP_OP_ENUMERATE) {
buffer = out_buffer;
@ -611,18 +625,30 @@ kvp_get_ip_address(int family, char *if_name, int op,
goto gather_ipaddr;
} else {
ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
/*
* Get subnet info.
* Get subnet info in CIDR format.
*/
error = kvp_process_ip_address(
curp->ifa_netmask,
AF_INET6,
(char *)
ip_buffer->sub_net,
length,
&sn_offset);
if (error)
weight = 0;
sn_str = (char *)ip_buffer->sub_net;
addr6 = (struct sockaddr_in6 *)
curp->ifa_netmask;
w = addr6->sin6_addr.s6_addr32;
for (i = 0; i < 4; i++)
weight += hweight32(&w[i]);
sprintf(cidr_mask, "/%d", weight);
if ((length - sn_offset) <
(strlen(cidr_mask) + 1))
goto gather_ipaddr;
if (sn_offset == 0)
strcpy(sn_str, cidr_mask);
else
strcat(sn_str, cidr_mask);
strcat((char *)ip_buffer->sub_net, ";");
sn_offset += strlen(sn_str) + 1;
}
}