1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 #include <sys/param.h> 30 #include <sys/ioctl.h> 31 32 #include <net/if.h> 33 #include <netinet/ip_carp.h> 34 #include <netinet/ip_carp_nl.h> 35 36 #include <netlink/netlink.h> 37 #include <netlink/netlink_generic.h> 38 #include <netlink/netlink_snl.h> 39 #include <netlink/netlink_snl_generic.h> 40 #include <netlink/netlink_snl_route.h> 41 42 #include <string.h> 43 #include <strings.h> 44 45 #include "libifconfig.h" 46 #include "libifconfig_internal.h" 47 48 #include <stdio.h> 49 50 #define _OUT(_field) offsetof(struct ifconfig_carp, _field) 51 static struct snl_attr_parser ap_carp_get[] = { 52 { .type = CARP_NL_VHID, .off = _OUT(carpr_vhid), .cb = snl_attr_get_uint32 }, 53 { .type = CARP_NL_STATE, .off = _OUT(carpr_state), .cb = snl_attr_get_uint32 }, 54 { .type = CARP_NL_ADVBASE, .off = _OUT(carpr_advbase), .cb = snl_attr_get_int32 }, 55 { .type = CARP_NL_ADVSKEW, .off = _OUT(carpr_advskew), .cb = snl_attr_get_int32 }, 56 { .type = CARP_NL_KEY, .off = _OUT(carpr_key), .cb = snl_attr_copy_string, .arg_u32 = CARP_KEY_LEN }, 57 { .type = CARP_NL_ADDR, .off = _OUT(carpr_addr), .cb = snl_attr_get_in_addr }, 58 { .type = CARP_NL_ADDR6, .off = _OUT(carpr_addr6), .cb = snl_attr_get_in6_addr }, 59 { .type = CARP_NL_VERSION, .off = _OUT(carpr_version), .cb = snl_attr_get_uint8 }, 60 { .type = CARP_NL_VRRP_PRIORITY, .off = _OUT(carpr_vrrp_prio), .cb = snl_attr_get_uint8 }, 61 { .type = CARP_NL_VRRP_ADV_INTER, .off = _OUT(carpr_vrrp_adv_inter), .cb = snl_attr_get_uint16 }, 62 }; 63 #undef _OUT 64 65 SNL_DECLARE_GENL_PARSER(carp_get_parser, ap_carp_get); 66 67 static int 68 _ifconfig_carp_get(ifconfig_handle_t *h, const char *name, 69 struct ifconfig_carp *carp, size_t ncarp, uint32_t vhid) 70 { 71 struct snl_state ss = {}; 72 struct snl_errmsg_data e = {}; 73 struct snl_writer nw; 74 struct nlmsghdr *hdr; 75 size_t i = 0; 76 uint32_t seq_id; 77 int family_id; 78 79 ifconfig_error_clear(h); 80 81 bzero(carp, sizeof(*carp) * ncarp); 82 83 if (! snl_init(&ss, NETLINK_GENERIC)) { 84 ifconfig_error(h, NETLINK, ENOTSUP); 85 return (-1); 86 } 87 88 snl_init_writer(&ss, &nw); 89 90 family_id = snl_get_genl_family(&ss, CARP_NL_FAMILY_NAME); 91 if (family_id == 0) { 92 ifconfig_error(h, NETLINK, EPROTONOSUPPORT); 93 goto out; 94 } 95 96 hdr = snl_create_genl_msg_request(&nw, family_id, CARP_NL_CMD_GET); 97 hdr->nlmsg_flags |= NLM_F_DUMP; 98 99 snl_add_msg_attr_string(&nw, CARP_NL_IFNAME, name); 100 101 if (vhid != 0) 102 snl_add_msg_attr_u32(&nw, CARP_NL_VHID, vhid); 103 104 hdr = snl_finalize_msg(&nw); 105 if (hdr == NULL) { 106 ifconfig_error(h, NETLINK, ENOMEM); 107 goto out; 108 } 109 seq_id = hdr->nlmsg_seq; 110 if (! snl_send_message(&ss, hdr)) { 111 ifconfig_error(h, NETLINK, EIO); 112 goto out; 113 } 114 115 while ((hdr = snl_read_reply_multi(&ss, seq_id, &e)) != NULL) { 116 if (e.error != 0) { 117 ifconfig_error(h, NETLINK, e.error); 118 break; 119 } 120 121 if (i >= ncarp) { 122 ifconfig_error(h, NETLINK, E2BIG); 123 break; 124 } 125 126 memset(&carp[i], 0, sizeof(carp[0])); 127 if (! snl_parse_nlmsg(&ss, hdr, &carp_get_parser, &carp[i])) 128 continue; 129 130 i++; 131 carp[0].carpr_count = i; 132 133 if (i > ncarp) { 134 ifconfig_error(h, NETLINK, E2BIG); 135 break; 136 } 137 } 138 139 out: 140 snl_free(&ss); 141 142 return (h->error.errcode ? -1 : 0); 143 } 144 145 int 146 ifconfig_carp_set_info(ifconfig_handle_t *h, const char *name, 147 const struct ifconfig_carp *carpr) 148 { 149 struct snl_state ss = {}; 150 struct snl_writer nw; 151 struct nlmsghdr *hdr; 152 int family_id; 153 uint32_t seq_id; 154 155 ifconfig_error_clear(h); 156 157 if (! snl_init(&ss, NETLINK_GENERIC)) { 158 ifconfig_error(h, NETLINK, ENOTSUP); 159 return (-1); 160 } 161 162 snl_init_writer(&ss, &nw); 163 164 family_id = snl_get_genl_family(&ss, CARP_NL_FAMILY_NAME); 165 if (family_id == 0) { 166 ifconfig_error(h, NETLINK, EPROTONOSUPPORT); 167 return (-1); 168 } 169 hdr = snl_create_genl_msg_request(&nw, family_id, CARP_NL_CMD_SET); 170 171 snl_add_msg_attr_u32(&nw, CARP_NL_VHID, carpr->carpr_vhid); 172 snl_add_msg_attr_u32(&nw, CARP_NL_STATE, carpr->carpr_state); 173 snl_add_msg_attr_s32(&nw, CARP_NL_ADVBASE, carpr->carpr_advbase); 174 snl_add_msg_attr_s32(&nw, CARP_NL_ADVSKEW, carpr->carpr_advskew); 175 snl_add_msg_attr_string(&nw, CARP_NL_IFNAME, name); 176 snl_add_msg_attr(&nw, CARP_NL_ADDR, sizeof(carpr->carpr_addr), 177 &carpr->carpr_addr); 178 snl_add_msg_attr(&nw, CARP_NL_ADDR6, sizeof(carpr->carpr_addr6), 179 &carpr->carpr_addr6); 180 snl_add_msg_attr_string(&nw, CARP_NL_KEY, carpr->carpr_key); 181 snl_add_msg_attr_u8(&nw, CARP_NL_VERSION, carpr->carpr_version); 182 snl_add_msg_attr_u8(&nw, CARP_NL_VRRP_PRIORITY, carpr->carpr_vrrp_prio); 183 snl_add_msg_attr_u16(&nw, CARP_NL_VRRP_ADV_INTER, carpr->carpr_vrrp_adv_inter); 184 185 hdr = snl_finalize_msg(&nw); 186 if (hdr == NULL) { 187 ifconfig_error(h, NETLINK, ENOMEM); 188 goto out; 189 } 190 191 seq_id = hdr->nlmsg_seq; 192 if (! snl_send_message(&ss, hdr)) { 193 ifconfig_error(h, NETLINK, EIO); 194 goto out; 195 } 196 197 struct snl_errmsg_data e = { }; 198 if (! snl_read_reply_code(&ss, seq_id, &e)) 199 ifconfig_error(h, NETLINK, e.error); 200 201 out: 202 snl_free(&ss); 203 204 return (h->error.errcode ? -1 : 0); 205 } 206 207 int 208 ifconfig_carp_get_vhid(ifconfig_handle_t *h, const char *name, 209 struct ifconfig_carp *carp, uint32_t vhid) 210 { 211 return (_ifconfig_carp_get(h, name, carp, 1, vhid)); 212 } 213 214 int 215 ifconfig_carp_get_info(ifconfig_handle_t *h, const char *name, 216 struct ifconfig_carp *carp, size_t ncarp) 217 { 218 return (_ifconfig_carp_get(h, name, carp, ncarp, 0)); 219 } 220