6a23843a4a
There were two issues with the carp key configuration in the new netlink code. The first is that userspace failed to actually pass the CARP_NL_KEY attribute to the kernel, so a key was never set. The second issue is that snl_attr_get_string() returns a pointer to the string inside the netlink message. It does not copy the string to the target buffer. That's somewhat inconvenient to work with in libifconfig where we have a static buffer for the key. Introduce snl_attr_copy_string() which can copy a string to a target buffer and uses the 'arg' parameter to pass the buffer size, so it doesn't accidentally exceed the available space. Reviewed by: melifaro Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D39874
216 lines
6.1 KiB
C
216 lines
6.1 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <netinet/ip_carp.h>
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#include <netinet/ip_carp_nl.h>
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#include <netlink/netlink.h>
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#include <netlink/netlink_generic.h>
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#include <netlink/netlink_snl.h>
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#include <netlink/netlink_snl_generic.h>
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#include <netlink/netlink_snl_route.h>
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#include <string.h>
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#include <strings.h>
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#include "libifconfig.h"
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#include "libifconfig_internal.h"
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#include <stdio.h>
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#define _OUT(_field) offsetof(struct ifconfig_carp, _field)
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static struct snl_attr_parser ap_carp_get[] = {
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{ .type = CARP_NL_VHID, .off = _OUT(carpr_vhid), .cb = snl_attr_get_uint32 },
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{ .type = CARP_NL_STATE, .off = _OUT(carpr_state), .cb = snl_attr_get_uint32 },
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{ .type = CARP_NL_ADVBASE, .off = _OUT(carpr_advbase), .cb = snl_attr_get_int32 },
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{ .type = CARP_NL_ADVSKEW, .off = _OUT(carpr_advskew), .cb = snl_attr_get_int32 },
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{ .type = CARP_NL_KEY, .off = _OUT(carpr_key), .cb = snl_attr_copy_string, .arg_u32 = CARP_KEY_LEN },
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{ .type = CARP_NL_ADDR, .off = _OUT(carpr_addr), .cb = snl_attr_get_in_addr },
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{ .type = CARP_NL_ADDR6, .off = _OUT(carpr_addr6), .cb = snl_attr_get_in6_addr },
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};
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#undef _OUT
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SNL_DECLARE_GENL_PARSER(carp_get_parser, ap_carp_get);
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static int
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_ifconfig_carp_get(ifconfig_handle_t *h, const char *name,
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struct ifconfig_carp *carp, size_t ncarp, uint32_t vhid)
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{
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struct snl_state ss = {};
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struct snl_errmsg_data e = {};
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struct snl_writer nw;
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struct nlmsghdr *hdr;
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size_t i = 0;
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uint32_t seq_id;
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int family_id;
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ifconfig_error_clear(h);
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bzero(carp, sizeof(*carp) * ncarp);
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if (! snl_init(&ss, NETLINK_GENERIC)) {
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ifconfig_error(h, NETLINK, ENOTSUP);
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return (-1);
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}
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snl_init_writer(&ss, &nw);
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family_id = snl_get_genl_family(&ss, CARP_NL_FAMILY_NAME);
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if (family_id == 0) {
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ifconfig_error(h, NETLINK, EPROTONOSUPPORT);
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goto out;
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}
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hdr = snl_create_genl_msg_request(&nw, family_id, CARP_NL_CMD_GET);
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hdr->nlmsg_flags |= NLM_F_DUMP;
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snl_add_msg_attr_string(&nw, CARP_NL_IFNAME, name);
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if (vhid != 0)
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snl_add_msg_attr_u32(&nw, CARP_NL_VHID, vhid);
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hdr = snl_finalize_msg(&nw);
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if (hdr == NULL) {
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ifconfig_error(h, NETLINK, ENOMEM);
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goto out;
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}
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seq_id = hdr->nlmsg_seq;
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if (! snl_send_message(&ss, hdr)) {
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ifconfig_error(h, NETLINK, EIO);
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goto out;
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}
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while ((hdr = snl_read_reply_multi(&ss, seq_id, &e)) != NULL) {
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if (e.error != 0) {
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ifconfig_error(h, NETLINK, e.error);
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break;
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}
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if (i >= ncarp) {
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ifconfig_error(h, NETLINK, E2BIG);
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break;
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}
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memset(&carp[i], 0, sizeof(carp[0]));
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if (! snl_parse_nlmsg(&ss, hdr, &carp_get_parser, &carp[i]))
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continue;
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i++;
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carp[0].carpr_count = i;
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if (i > ncarp) {
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ifconfig_error(h, NETLINK, E2BIG);
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break;
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}
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}
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out:
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snl_free(&ss);
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return (h->error.errcode ? -1 : 0);
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}
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int
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ifconfig_carp_set_info(ifconfig_handle_t *h, const char *name,
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const struct ifconfig_carp *carpr)
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{
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struct snl_state ss = {};
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struct snl_writer nw;
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struct nlmsghdr *hdr;
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int family_id;
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uint32_t seq_id;
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ifconfig_error_clear(h);
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if (! snl_init(&ss, NETLINK_GENERIC)) {
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ifconfig_error(h, NETLINK, ENOTSUP);
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return (-1);
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}
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snl_init_writer(&ss, &nw);
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family_id = snl_get_genl_family(&ss, CARP_NL_FAMILY_NAME);
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if (family_id == 0) {
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ifconfig_error(h, NETLINK, EPROTONOSUPPORT);
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return (-1);
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}
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hdr = snl_create_genl_msg_request(&nw, family_id, CARP_NL_CMD_SET);
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snl_add_msg_attr_u32(&nw, CARP_NL_VHID, carpr->carpr_vhid);
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snl_add_msg_attr_u32(&nw, CARP_NL_STATE, carpr->carpr_state);
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snl_add_msg_attr_s32(&nw, CARP_NL_ADVBASE, carpr->carpr_advbase);
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snl_add_msg_attr_s32(&nw, CARP_NL_ADVSKEW, carpr->carpr_advskew);
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snl_add_msg_attr_string(&nw, CARP_NL_IFNAME, name);
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snl_add_msg_attr(&nw, CARP_NL_ADDR, sizeof(carpr->carpr_addr),
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&carpr->carpr_addr);
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snl_add_msg_attr(&nw, CARP_NL_ADDR6, sizeof(carpr->carpr_addr6),
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&carpr->carpr_addr6);
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snl_add_msg_attr_string(&nw, CARP_NL_KEY, carpr->carpr_key);
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hdr = snl_finalize_msg(&nw);
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if (hdr == NULL) {
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ifconfig_error(h, NETLINK, ENOMEM);
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goto out;
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}
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seq_id = hdr->nlmsg_seq;
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if (! snl_send_message(&ss, hdr)) {
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ifconfig_error(h, NETLINK, EIO);
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goto out;
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}
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struct snl_errmsg_data e = { };
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if (! snl_read_reply_code(&ss, seq_id, &e))
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ifconfig_error(h, NETLINK, e.error);
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out:
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snl_free(&ss);
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return (h->error.errcode ? -1 : 0);
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}
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int
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ifconfig_carp_get_vhid(ifconfig_handle_t *h, const char *name,
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struct ifconfig_carp *carp, uint32_t vhid)
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{
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return (_ifconfig_carp_get(h, name, carp, 1, vhid));
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}
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int
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ifconfig_carp_get_info(ifconfig_handle_t *h, const char *name,
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struct ifconfig_carp *carp, size_t ncarp)
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{
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return (_ifconfig_carp_get(h, name, carp, ncarp, 0));
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}
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