Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933543Ab2HQBQl (ORCPT ); Thu, 16 Aug 2012 21:16:41 -0400 Received: from p3plsmtps2ded02.prod.phx3.secureserver.net ([208.109.80.59]:53583 "HELO p3plsmtps2ded02-01.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S933120Ab2HQBPw (ORCPT ); Thu, 16 Aug 2012 21:15:52 -0400 From: "K. Y. Srinivasan" To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, virtualization@lists.osdl.org, olaf@aepfle.de, apw@canonical.com, ben@decadent.org.uk Cc: "K. Y. Srinivasan" Subject: [PATCH V3 06/14] Tools: hv: Represent the ipv6 mask using CIDR notation Date: Thu, 16 Aug 2012 18:32:17 -0700 Message-Id: <1345167145-5513-6-git-send-email-kys@microsoft.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1345167145-5513-1-git-send-email-kys@microsoft.com> References: <1345167068-5461-1-git-send-email-kys@microsoft.com> <1345167145-5513-1-git-send-email-kys@microsoft.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2557 Lines: 93 Transform ipv6 subnet information to CIDR notation. Signed-off-by: K. Y. Srinivasan Reviewed-by: Haiyang Zhang --- 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 de1724c..a63e83a 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; } } -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/