if-linux.c revision e86eee143ed21592f88a46623a81f71002430459
1f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project/* 2f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * dhcpcd - DHCP client daemon 3e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt * Copyright (c) 2006-2010 Roy Marples <roy@marples.name> 4f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * All rights reserved 5f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 6f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * Redistribution and use in source and binary forms, with or without 7f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * modification, are permitted provided that the following conditions 8f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * are met: 9f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 10f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * notice, this list of conditions and the following disclaimer. 11f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 12f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 13f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * documentation and/or other materials provided with the distribution. 14f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * 15f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project * SUCH DAMAGE. 26f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project */ 27f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 28f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <asm/types.h> /* Needed for 2.4 kernels */ 29f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 30f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <sys/types.h> 31f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <sys/socket.h> 32f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <sys/ioctl.h> 33f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <sys/param.h> 34f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 35f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <linux/netlink.h> 36f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <linux/rtnetlink.h> 37e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 38e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt/* Support older kernels */ 39e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt#ifndef IFLA_WIRELESS 40e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt# define IFLA_WIRELESS (IFLA_MASTER + 1) 41e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt#endif 42f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 43f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <errno.h> 44e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt#include <ctype.h> 45f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <stddef.h> 46f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <stdio.h> 47f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <stdlib.h> 48f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <string.h> 49f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include <unistd.h> 50f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 51f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include "config.h" 52f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include "common.h" 53e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt#include "configure.h" 54f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include "dhcp.h" 55f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project#include "net.h" 56f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 57e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtstatic int sock_fd; 58e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtstatic struct sockaddr_nl sock_nl; 59e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 60e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtint 61e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtif_init(struct interface *iface) 62e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt{ 63e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt char path[PATH_MAX]; 64e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt FILE *fp; 65e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt int n; 66e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 67e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt /* We enable promote_secondaries so that we can do this 68e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt * add 192.168.1.2/24 69e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt * add 192.168.1.3/24 70e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt * del 192.168.1.2/24 71e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt * and the subnet mask moves onto 192.168.1.3/24 72e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt * This matches the behaviour of BSD which makes coding dhcpcd 73e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt * a little easier as there's just one behaviour. */ 74e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt snprintf(path, sizeof(path), 75e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt "/proc/sys/net/ipv4/conf/%s/promote_secondaries", 76e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt iface->name); 77e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 78e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt fp = fopen(path, "w"); 79e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (fp == NULL) 80e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return errno == ENOENT ? 0 : -1; 81e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt n = fprintf(fp, "1"); 82e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt fclose(fp); 83e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return n == -1 ? -1 : 0; 84e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt} 85f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 86f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectint 87e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtif_conf(struct interface *iface) 88e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt{ 89e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt char path[PATH_MAX], buf[1]; 90e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt FILE *fp; 91e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 92e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt /* Some qeth setups require the use of the broadcast flag. */ 93e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt snprintf(path, sizeof(path), 94e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt "/sys/class/net/%s/device/layer2", 95e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt iface->name); 96e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 97e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt fp = fopen(path, "r"); 98e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (fp == NULL) 99e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return errno == ENOENT ? 0 : -1; 100e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (fgets(buf, sizeof(buf), fp) != NULL && buf[0] == '0') 101e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt iface->state->options->options |= DHCPCD_BROADCAST; 102e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt fclose(fp); 103e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 0; 104e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt} 105e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 106e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtstatic int 107e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt_open_link_socket(struct sockaddr_nl *nl) 108f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 109f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project int fd; 110f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 111f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) == -1) 112f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 113e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt nl->nl_family = AF_NETLINK; 114e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (bind(fd, (struct sockaddr *)nl, sizeof(*nl)) == -1) 115f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 116f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project set_cloexec(fd); 117e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return fd; 118e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt} 119e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 120e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtint 121e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtinit_sockets(void) 122e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt{ 123e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if ((socket_afnet = socket(AF_INET, SOCK_DGRAM, 0)) == -1) 124e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return -1; 125e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt set_cloexec(socket_afnet); 126e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt sock_fd = _open_link_socket(&sock_nl); 127e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt set_cloexec(sock_fd); 128e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return sock_fd; 129e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt} 130e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 131e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtint 132e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtopen_link_socket(void) 133e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt{ 134e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt struct sockaddr_nl snl; 135e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 136e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt memset(&snl, 0, sizeof(snl)); 137e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt snl.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_IFADDR; 138e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return _open_link_socket(&snl); 139f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 140f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 141f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectstatic int 142f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectget_netlink(int fd, int flags, 143e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt int (*callback)(struct nlmsghdr *)) 144f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 145e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt char *buf = NULL, *nbuf; 146e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt ssize_t buflen = 0, bytes; 147f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct nlmsghdr *nlm; 148f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project int r = -1; 149f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 150f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project for (;;) { 151e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt bytes = recv(fd, NULL, 0, 152e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt flags | MSG_PEEK | MSG_DONTWAIT | MSG_TRUNC); 153f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (bytes == -1) { 154f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (errno == EAGAIN) { 155f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project r = 0; 156f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project goto eexit; 157f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 158f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (errno == EINTR) 159f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project continue; 160f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project goto eexit; 161e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } else if (bytes == buflen) { 162e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt /* Support kernels older than 2.6.22 */ 163e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (bytes == 0) 164e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt bytes = 512; 165e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt else 166e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt bytes *= 2; 167f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 168e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (buflen < bytes) { 169e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt /* Alloc 1 more so we work with older kernels */ 170e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt buflen = bytes + 1; 171e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt nbuf = realloc(buf, buflen); 172e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (nbuf == NULL) 173e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt goto eexit; 174e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt buf = nbuf; 175e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 176e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt bytes = recv(fd, buf, buflen, flags); 177e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (bytes == -1) { 178e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (errno == EAGAIN) { 179e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt r = 0; 180e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt goto eexit; 181e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 182e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (errno == EINTR) 183e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt continue; 184e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt goto eexit; 185e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 186e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt for (nlm = (struct nlmsghdr *)buf; 187f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project NLMSG_OK(nlm, (size_t)bytes); 188f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm = NLMSG_NEXT(nlm, bytes)) 189f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project { 190e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt r = callback(nlm); 191f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (r != 0) 192f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project goto eexit; 193f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 194f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 195f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 196f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projecteexit: 197e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt free(buf); 198f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return r; 199f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 200f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 201f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectstatic int 202e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidterr_netlink(struct nlmsghdr *nlm) 203f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 204f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct nlmsgerr *err; 205f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project int l; 206f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 207f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (nlm->nlmsg_type != NLMSG_ERROR) 208f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return 0; 209f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project l = nlm->nlmsg_len - sizeof(*nlm); 210f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if ((size_t)l < sizeof(*err)) { 211f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project errno = EBADMSG; 212f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 213f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 214f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project err = (struct nlmsgerr *)NLMSG_DATA(nlm); 215f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (err->error == 0) 216f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return l; 217f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project errno = -err->error; 218f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 219f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 220f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 221f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectstatic int 222e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtlink_route(struct nlmsghdr *nlm) 223e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt{ 224e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt int len, idx, metric; 225e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt struct rtattr *rta; 226e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt struct rtmsg *rtm; 227e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt struct rt rt; 228e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt char ifn[IF_NAMESIZE + 1]; 229e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 230e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (nlm->nlmsg_type != RTM_DELROUTE) 231e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 0; 232e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 233e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt len = nlm->nlmsg_len - sizeof(*nlm); 234e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if ((size_t)len < sizeof(*rtm)) { 235e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt errno = EBADMSG; 236e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return -1; 237e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 238e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rtm = NLMSG_DATA(nlm); 239e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (rtm->rtm_type != RTN_UNICAST || 240e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rtm->rtm_table != RT_TABLE_MAIN || 241e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rtm->rtm_family != AF_INET || 242e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt nlm->nlmsg_pid == (uint32_t)getpid()) 243e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 1; 244e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rta = (struct rtattr *) ((char *)rtm + NLMSG_ALIGN(sizeof(*rtm))); 245e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt len = NLMSG_PAYLOAD(nlm, sizeof(*rtm)); 246e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rt.iface = NULL; 247e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rt.dest.s_addr = INADDR_ANY; 248e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rt.net.s_addr = INADDR_ANY; 249e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rt.gate.s_addr = INADDR_ANY; 250e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rt.next = NULL; 251e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt metric = 0; 252e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt while (RTA_OK(rta, len)) { 253e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt switch (rta->rta_type) { 254e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt case RTA_DST: 255e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt memcpy(&rt.dest.s_addr, RTA_DATA(rta), 256e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt sizeof(rt.dest.s_addr)); 257e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt break; 258e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt case RTA_GATEWAY: 259e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt memcpy(&rt.gate.s_addr, RTA_DATA(rta), 260e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt sizeof(rt.gate.s_addr)); 261e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt break; 262e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt case RTA_OIF: 263e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt idx = *(int *)RTA_DATA(rta); 264e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (if_indextoname(idx, ifn)) 265e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rt.iface = find_interface(ifn); 266e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt break; 267e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt case RTA_PRIORITY: 268e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt metric = *(int *)RTA_DATA(rta); 269e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt break; 270e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 271e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rta = RTA_NEXT(rta, len); 272e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 273e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (rt.iface != NULL) { 274e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (metric == rt.iface->metric) { 275e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt inet_cidrtoaddr(rtm->rtm_dst_len, &rt.net); 276e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt route_deleted(&rt); 277e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 278e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 279e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 1; 280e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt} 281e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 282e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtstatic int 283e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtlink_addr(struct nlmsghdr *nlm) 284e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt{ 285e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt int len; 286e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt struct rtattr *rta; 287e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt struct ifaddrmsg *ifa; 288e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt struct in_addr addr, net, dest; 289e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt char ifn[IF_NAMESIZE + 1]; 290e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt struct interface *iface; 291e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 292e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (nlm->nlmsg_type != RTM_DELADDR && nlm->nlmsg_type != RTM_NEWADDR) 293e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 0; 294e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 295e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt len = nlm->nlmsg_len - sizeof(*nlm); 296e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if ((size_t)len < sizeof(*ifa)) { 297e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt errno = EBADMSG; 298e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return -1; 299e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 300e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (nlm->nlmsg_pid == (uint32_t)getpid()) 301e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 1; 302e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt ifa = NLMSG_DATA(nlm); 303e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (if_indextoname(ifa->ifa_index, ifn) == NULL) 304e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return -1; 305e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt iface = find_interface(ifn); 306e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (iface == NULL) 307e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 1; 308e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rta = (struct rtattr *) IFA_RTA(ifa); 309e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt len = NLMSG_PAYLOAD(nlm, sizeof(*ifa)); 310e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt addr.s_addr = dest.s_addr = INADDR_ANY; 311e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt dest.s_addr = INADDR_ANY; 312e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt inet_cidrtoaddr(ifa->ifa_prefixlen, &net); 313e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt while (RTA_OK(rta, len)) { 314e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt switch (rta->rta_type) { 315e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt case IFA_ADDRESS: 316e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (iface->flags & IFF_POINTOPOINT) { 317e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt memcpy(&dest.s_addr, RTA_DATA(rta), 318e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt sizeof(addr.s_addr)); 319e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 320e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt break; 321e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt case IFA_LOCAL: 322e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt memcpy(&addr.s_addr, RTA_DATA(rta), 323e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt sizeof(addr.s_addr)); 324e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt break; 325e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 326e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt rta = RTA_NEXT(rta, len); 327e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt } 328e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt handle_ifa(nlm->nlmsg_type, ifn, &addr, &net, &dest); 329e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 1; 330e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt} 331e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 332e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtstatic int 333e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtlink_netlink(struct nlmsghdr *nlm) 334f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 335f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project int len; 336f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct rtattr *rta; 337f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct ifinfomsg *ifi; 338f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project char ifn[IF_NAMESIZE + 1]; 339f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 340e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt len = link_route(nlm); 341e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (len != 0) 342e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return len; 343e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt len = link_addr(nlm); 344e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (len != 0) 345e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return len; 346e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt 347f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (nlm->nlmsg_type != RTM_NEWLINK && nlm->nlmsg_type != RTM_DELLINK) 348f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return 0; 349f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project len = nlm->nlmsg_len - sizeof(*nlm); 350f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if ((size_t)len < sizeof(*ifi)) { 351f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project errno = EBADMSG; 352f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 353f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 354f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project ifi = NLMSG_DATA(nlm); 355f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (ifi->ifi_flags & IFF_LOOPBACK) 356e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 1; 357f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project rta = (struct rtattr *) ((char *)ifi + NLMSG_ALIGN(sizeof(*ifi))); 358f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project len = NLMSG_PAYLOAD(nlm, sizeof(*ifi)); 359f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project *ifn = '\0'; 360f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project while (RTA_OK(rta, len)) { 361f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project switch (rta->rta_type) { 362f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project case IFLA_WIRELESS: 363f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project /* Ignore wireless messages */ 364f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (nlm->nlmsg_type == RTM_NEWLINK && 365e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt ifi->ifi_change == 0) 366e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 1; 367f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project break; 368f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project case IFLA_IFNAME: 369f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project strlcpy(ifn, RTA_DATA(rta), sizeof(ifn)); 370f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project break; 371f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 372f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project rta = RTA_NEXT(rta, len); 373f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 374e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (nlm->nlmsg_type == RTM_NEWLINK) 375e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt len = ifi->ifi_change == ~0U ? 1 : 0; 376e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt else 377e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt len = -1; 378e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt handle_interface(len, ifn); 379e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return 1; 380f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 381f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 382f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectint 383e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtmanage_link(int fd) 384f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 385e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt return get_netlink(fd, MSG_DONTWAIT, &link_netlink); 386f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 387f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 388f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectstatic int 389f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectsend_netlink(struct nlmsghdr *hdr) 390f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 391e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt int r; 392f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct iovec iov; 393f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct msghdr msg; 394f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project static unsigned int seq; 395f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 396f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project memset(&iov, 0, sizeof(iov)); 397f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project iov.iov_base = hdr; 398f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project iov.iov_len = hdr->nlmsg_len; 399f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project memset(&msg, 0, sizeof(msg)); 400e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt msg.msg_name = &sock_nl; 401e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt msg.msg_namelen = sizeof(sock_nl); 402f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project msg.msg_iov = &iov; 403f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project msg.msg_iovlen = 1; 404f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project /* Request a reply */ 405f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project hdr->nlmsg_flags |= NLM_F_ACK; 406f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project hdr->nlmsg_seq = ++seq; 407f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 408e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (sendmsg(sock_fd, &msg, 0) != -1) 409e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt r = get_netlink(sock_fd, 0, &err_netlink); 410f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project else 411f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project r = -1; 412f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return r; 413f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 414f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 415e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt#define NLMSG_TAIL(nmsg) \ 416f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project ((struct rtattr *)(((ptrdiff_t)(nmsg))+NLMSG_ALIGN((nmsg)->nlmsg_len))) 417f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 418f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectstatic int 419f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectadd_attr_l(struct nlmsghdr *n, unsigned int maxlen, int type, 420e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt const void *data, int alen) 421f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 422f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project int len = RTA_LENGTH(alen); 423f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct rtattr *rta; 424f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 425f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) { 426f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project errno = ENOBUFS; 427f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 428f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 429f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 430f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project rta = NLMSG_TAIL(n); 431f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project rta->rta_type = type; 432f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project rta->rta_len = len; 433f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project memcpy(RTA_DATA(rta), data, alen); 434f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); 435f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 436f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return 0; 437f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 438f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 439f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectstatic int 440f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectadd_attr_32(struct nlmsghdr *n, unsigned int maxlen, int type, uint32_t data) 441f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 442f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project int len = RTA_LENGTH(sizeof(data)); 443f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct rtattr *rta; 444f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 445f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) { 446f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project errno = ENOBUFS; 447f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 448f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 449f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 450f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project rta = NLMSG_TAIL(n); 451f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project rta->rta_type = type; 452f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project rta->rta_len = len; 453f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project memcpy(RTA_DATA(rta), &data, sizeof(data)); 454f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len; 455f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 456f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return 0; 457f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 458f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 459f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectstruct nlma 460f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 461f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct nlmsghdr hdr; 462f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct ifaddrmsg ifa; 463f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project char buffer[64]; 464f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project}; 465f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 466f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectstruct nlmr 467f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 468f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct nlmsghdr hdr; 469f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct rtmsg rt; 470f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project char buffer[256]; 471f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project}; 472f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 473f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectint 474e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidtif_address(const struct interface *iface, 475e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt const struct in_addr *address, const struct in_addr *netmask, 476e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt const struct in_addr *broadcast, int action) 477f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 478f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct nlma *nlm; 479f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project int retval = 0; 480f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 481f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm = xzalloc(sizeof(*nlm)); 482f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); 483f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_flags = NLM_F_REQUEST; 484f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (action >= 0) { 485f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE; 486f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_type = RTM_NEWADDR; 487f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } else 488f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_type = RTM_DELADDR; 489e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (!(nlm->ifa.ifa_index = if_nametoindex(iface->name))) { 490f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project free(nlm); 491f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project errno = ENODEV; 492f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 493f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 494f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->ifa.ifa_family = AF_INET; 495f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->ifa.ifa_prefixlen = inet_ntocidr(*netmask); 496f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project /* This creates the aliased interface */ 497f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project add_attr_l(&nlm->hdr, sizeof(*nlm), IFA_LABEL, 498e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt iface->name, strlen(iface->name) + 1); 499f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project add_attr_l(&nlm->hdr, sizeof(*nlm), IFA_LOCAL, 500e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt &address->s_addr, sizeof(address->s_addr)); 501e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt if (action >= 0 && broadcast) 502f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project add_attr_l(&nlm->hdr, sizeof(*nlm), IFA_BROADCAST, 503e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt &broadcast->s_addr, sizeof(broadcast->s_addr)); 504f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 505f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (send_netlink(&nlm->hdr) == -1) 506f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project retval = -1; 507f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project free(nlm); 508f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return retval; 509f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 510f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 511f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Projectint 512938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidtif_route(const struct interface *iface, 513e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt const struct in_addr *destination, const struct in_addr *netmask, 514e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt const struct in_addr *gateway, int metric, int action) 515f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project{ 516f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project struct nlmr *nlm; 517f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project unsigned int ifindex; 518f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project int retval = 0; 519f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 520938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt if (!(ifindex = if_nametoindex(iface->name))) { 521f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project errno = ENODEV; 522f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return -1; 523f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 524f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 525f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm = xzalloc(sizeof(*nlm)); 526f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); 527f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_type = RTM_NEWROUTE; 528f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (action == 0) 529938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt nlm->hdr.nlmsg_flags = NLM_F_REPLACE; 530938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt else if (action == 1) 531e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt nlm->hdr.nlmsg_flags = NLM_F_CREATE | NLM_F_EXCL; 532f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project else 533f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_type = RTM_DELROUTE; 534f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->hdr.nlmsg_flags |= NLM_F_REQUEST; 535f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->rt.rtm_family = AF_INET; 536f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->rt.rtm_table = RT_TABLE_MAIN; 537f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 538938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt if (action == -1 || action == -2) 539f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->rt.rtm_scope = RT_SCOPE_NOWHERE; 540f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project else { 541e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt nlm->hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; 542938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt /* We only change route metrics for kernel routes */ 543938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt if (destination->s_addr == 544938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt (iface->addr.s_addr & iface->net.s_addr) && 545938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt netmask->s_addr == iface->net.s_addr) 546938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt nlm->rt.rtm_protocol = RTPROT_KERNEL; 547938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt else 548938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt nlm->rt.rtm_protocol = RTPROT_BOOT; 549938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt if (gateway->s_addr == INADDR_ANY || 550938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt (gateway->s_addr == destination->s_addr && 551e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt netmask->s_addr == INADDR_BROADCAST)) 552f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->rt.rtm_scope = RT_SCOPE_LINK; 553f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project else 554f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->rt.rtm_scope = RT_SCOPE_UNIVERSE; 555f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->rt.rtm_type = RTN_UNICAST; 556f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project } 557f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 558f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project nlm->rt.rtm_dst_len = inet_ntocidr(*netmask); 559f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_DST, 560e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt &destination->s_addr, sizeof(destination->s_addr)); 561938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt if (nlm->rt.rtm_protocol == RTPROT_KERNEL) { 562938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_PREFSRC, 563e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt &iface->addr.s_addr, sizeof(iface->addr.s_addr)); 564938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt } 565938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt /* If destination == gateway then don't add the gateway */ 566938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt if (destination->s_addr != gateway->s_addr || 567938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt netmask->s_addr != INADDR_BROADCAST) 568938bc384f44031877543765a9ae18c764f5da9c8Dmitry Shmidt add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_GATEWAY, 569e86eee143ed21592f88a46623a81f71002430459Dmitry Shmidt &gateway->s_addr, sizeof(gateway->s_addr)); 570f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 571f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_OIF, ifindex); 572f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_PRIORITY, metric); 573f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project 574f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project if (send_netlink(&nlm->hdr) == -1) 575f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project retval = -1; 576f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project free(nlm); 577f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project return retval; 578f7c5421560640d23fc10803b9d59a9ff1d83e467The Android Open Source Project} 579