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| author | K. Y. Srinivasan <kys@microsoft.com> | 2012-08-16 18:32:17 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-17 08:23:58 -0700 |
| commit | 6a60a6a8ea97795a288469c21262522894a1e6db (patch) | |
| tree | d51f0e970221137502beb00146aaf2575e75dac2 /tools | |
| parent | 04405784591117539eac4f5348c86d66dc0dd4f1 (diff) | |
| download | linux-6a60a6a8ea97795a288469c21262522894a1e6db.tar.bz2 | |
Tools: hv: Represent the ipv6 mask using CIDR notation
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>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/hv/hv_kvp_daemon.c | 46 |
1 files changed, 36 insertions, 10 deletions
diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c index de1724cbaf59..a63e83a0159f 100644 --- a/tools/hv/hv_kvp_daemon.c +++ b/tools/hv/hv_kvp_daemon.c @@ -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; } } |