genl.c revision ed6b39cc7746fabdd0d01c96afcf60b9544913d3
1ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker/* 2ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * Copyright (C) 2011 The Android Open Source Project 3ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * 4ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * Licensed under the Apache License, Version 2.0 (the "License"); 5ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * you may not use this file except in compliance with the License. 6ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * You may obtain a copy of the License at 7ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * 8ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * http://www.apache.org/licenses/LICENSE-2.0 9ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * 10ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * Unless required by applicable law or agreed to in writing, software 11ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * distributed under the License is distributed on an "AS IS" BASIS, 12ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * See the License for the specific language governing permissions and 14ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * limitations under the License. 15ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker */ 16ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 17ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker/* NOTICE: This is a clean room re-implementation of libnl */ 18ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 19ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker#include <errno.h> 20ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker#include <unistd.h> 21ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker#include <stdio.h> 22ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker#include <sys/time.h> 23ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker#include <linux/netlink.h> 24ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker#include "netlink-types.h" 25ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 26ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker/* Get head of attribute data. */ 27ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerstruct nlattr *genlmsg_attrdata(const struct genlmsghdr *gnlh, int hdrlen) 28ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker{ 29ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return (struct nlattr *) \ 30ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker ((char *) gnlh + GENL_HDRLEN + NLMSG_ALIGN(hdrlen)); 31ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 32ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker} 33ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 34ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker/* Get length of attribute data. */ 35ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerint genlmsg_attrlen(const struct genlmsghdr *gnlh, int hdrlen) 36ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker{ 37ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct nlattr *nla; 38ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct nlmsghdr *nlh; 39ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 40ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nla = genlmsg_attrdata(gnlh, hdrlen); 41ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlh = (struct nlmsghdr *) ((char *) gnlh - NLMSG_HDRLEN); 42ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return (char *) nlmsg_tail(nlh) - (char *) nla; 43ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker} 44ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 45ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker/* Add generic netlink header to netlink message. */ 46ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makervoid *genlmsg_put(struct nl_msg *msg, uint32_t pid, uint32_t seq, int family, 47ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int hdrlen, int flags, uint8_t cmd, uint8_t version) 48ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker{ 49ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int new_size; 50ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct nlmsghdr *nlh; 51ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct timeval tv; 52ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct genlmsghdr *gmh; 53ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 54ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Make sure nl_msg has enough space */ 55ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker new_size = NLMSG_HDRLEN + GENL_HDRLEN + hdrlen; 56ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if ((sizeof(struct nl_msg) + new_size) > msg->nm_size) 57ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker goto fail; 58ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 59ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Fill in netlink header */ 60ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlh = msg->nm_nlh; 61ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlh->nlmsg_len = new_size; 62ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlh->nlmsg_type = family; 63ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlh->nlmsg_pid = getpid(); 64ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlh->nlmsg_flags = flags | NLM_F_REQUEST | NLM_F_ACK; 65ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 66ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Get current time for sequence number */ 67ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if (gettimeofday(&tv, NULL)) 68ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlh->nlmsg_seq = 1; 69ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker else 70ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlh->nlmsg_seq = (int) tv.tv_sec; 71ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 72ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Setup genlmsghdr in new message */ 73ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker gmh = (struct genlmsghdr *) ((char *)nlh + NLMSG_HDRLEN); 74ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker gmh->cmd = (__u8) cmd; 75ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker gmh->version = version; 76ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 77ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return gmh; 78ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerfail: 79ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return NULL; 80ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 81ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker} 82ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 83ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker/* Socket has already been alloced to connect it to kernel? */ 84ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerint genl_connect(struct nl_sock *sk) 85ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker{ 86ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return nl_connect(sk, NETLINK_GENERIC); 87ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 88ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker} 89ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 90ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerint genl_ctrl_alloc_cache(struct nl_sock *sock, struct nl_cache **result) 91ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker{ 92ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int rc = -1; 93ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int nl80211_genl_id = -1; 94ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker char sendbuf[sizeof(struct nlmsghdr)+sizeof(struct genlmsghdr)]; 95ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct nlmsghdr nlmhdr; 96ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct genlmsghdr gmhhdr; 97ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct iovec sendmsg_iov; 98ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct msghdr msg; 99ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int num_char; 100ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker const int RECV_BUF_SIZE = getpagesize(); 101ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker char *recvbuf; 102ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct iovec recvmsg_iov; 103ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int nl80211_flag = 0, nlm_f_multi = 0, nlmsg_done = 0; 104ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct nlmsghdr *nlh; 105ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 106ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* REQUEST GENERIC NETLINK FAMILY ID */ 107ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Message buffer */ 108ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmhdr.nlmsg_len = sizeof(sendbuf); 109ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmhdr.nlmsg_type = NETLINK_GENERIC; 110ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmhdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_DUMP; 111ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmhdr.nlmsg_seq = sock->s_seq_next; 112ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmhdr.nlmsg_pid = sock->s_local.nl_pid; 113ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 114ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Generic netlink header */ 115ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker gmhhdr.cmd = CTRL_CMD_GETFAMILY; 116ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker gmhhdr.version = CTRL_ATTR_FAMILY_ID; 117ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 118ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Combine netlink and generic netlink headers */ 119ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker memcpy(&sendbuf[0], &nlmhdr, sizeof(nlmhdr)); 120ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker memcpy(&sendbuf[0]+sizeof(nlmhdr), &gmhhdr, sizeof(gmhhdr)); 121ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 122ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Create IO vector with Netlink message */ 123ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker sendmsg_iov.iov_base = &sendbuf; 124ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker sendmsg_iov.iov_len = sizeof(sendbuf); 125ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 126ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Socket message */ 127ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_name = (void *) &sock->s_peer; 128ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_namelen = sizeof(sock->s_peer); 129ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_iov = &sendmsg_iov; 130ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_iovlen = 1; /* Only sending one iov */ 131ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_control = NULL; 132ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_controllen = 0; 133ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_flags = 0; 134ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 135ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Send message and verify sent */ 136ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker num_char = sendmsg(sock->s_fd, &msg, 0); 137ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if (num_char == -1) 138ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return -errno; 139ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 140ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* RECEIVE GENL CMD RESPONSE */ 141ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 142ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Create receive iov buffer */ 143ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker recvbuf = (char *) malloc(RECV_BUF_SIZE); 144ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 145ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Attach to iov */ 146ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker recvmsg_iov.iov_base = recvbuf; 147ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker recvmsg_iov.iov_len = RECV_BUF_SIZE; 148ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 149ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_iov = &recvmsg_iov; 150ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker msg.msg_iovlen = 1; 151ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 152ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /***************************************************************/ 153ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Receive message. If multipart message, keep receiving until */ 154ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* message type is NLMSG_DONE */ 155ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /***************************************************************/ 156ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 157ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker do { 158ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 159ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int recvmsg_len, nlmsg_rem; 160ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 161ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Receive message */ 162ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker memset(recvbuf, 0, RECV_BUF_SIZE); 163ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker recvmsg_len = recvmsg(sock->s_fd, &msg, 0); 164ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 165ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Make sure receive successful */ 166ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if (recvmsg_len < 0) { 167ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker rc = -errno; 168ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker goto error_recvbuf; 169ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker } 170ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 171ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Parse nlmsghdr */ 172ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmsg_for_each_msg(nlh, (struct nlmsghdr *) recvbuf, \ 173ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker recvmsg_len, nlmsg_rem) { 174ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct nlattr *nla; 175ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int nla_rem; 176ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 177ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Check type */ 178ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker switch (nlh->nlmsg_type) { 179ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker case NLMSG_DONE: 180ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker goto return_genl_id; 181ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker break; 182ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker case NLMSG_ERROR: 183ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 184ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Should check nlmsgerr struct received */ 185ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker fprintf(stderr, "Receive message error\n"); 186ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker goto error_recvbuf; 187ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker case NLMSG_OVERRUN: 188ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker fprintf(stderr, "Receive data partly lost\n"); 189ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker goto error_recvbuf; 190ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker case NLMSG_MIN_TYPE: 191ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker case NLMSG_NOOP: 192ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker break; 193ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker default: 194ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker break; 195ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker } 196ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 197ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 198ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 199ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Check flags */ 200ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if (nlh->nlmsg_flags & NLM_F_MULTI) 201ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlm_f_multi = 1; 202ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker else 203ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlm_f_multi = 0; 204ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 205ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if (nlh->nlmsg_type & NLMSG_DONE) 206ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmsg_done = 1; 207ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker else 208ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmsg_done = 0; 209ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 210ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Iteratve over attributes */ 211ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nla_for_each_attr(nla, 212ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmsg_attrdata(nlh, GENL_HDRLEN), 213ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nlmsg_attrlen(nlh, GENL_HDRLEN), 214ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nla_rem){ 215ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 216ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* If this family is nl80211 */ 217ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if (nla->nla_type == CTRL_ATTR_FAMILY_NAME && 218ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker !strcmp((char *)nla_data(nla), 219ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker "nl80211")) 220ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nl80211_flag = 1; 221ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 222ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Save the family id */ 223ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker else if (nl80211_flag && 224ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nla->nla_type == CTRL_ATTR_FAMILY_ID) 225ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker nl80211_genl_id = \ 226ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker *((int *)nla_data(nla)); 227ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 228ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker } 229ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 230ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker } 231ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 232ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker } while (nlm_f_multi && !nlmsg_done); 233ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 234ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerreturn_genl_id: 235ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Return family id as cache pointer */ 236ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker *result = (struct nl_cache *) nl80211_genl_id; 237ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker rc = 0; 238ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makererror_recvbuf: 239ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker free(recvbuf); 240ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makererror: 241ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return rc; 242ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker} 243ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 244ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker/* Checks the netlink cache to find family reference by name string */ 245ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker/* NOTE: Caller needs to call genl_family_put() when done with * 246ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker * returned object */ 247ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerstruct genl_family *genl_ctrl_search_by_name(struct nl_cache *cache, \ 248ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker const char *name) 249ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker{ 250ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* TODO: When will we release this memory ? */ 251ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker struct genl_family *gf = (struct genl_family *) \ 252ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker malloc(sizeof(struct genl_family)); 253ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if (!gf) 254ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker goto fail; 255ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker memset(gf, 0, sizeof(*gf)); 256ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 257ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Add ref */ 258ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker gf->ce_refcnt++; 259ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 260ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Overriding cache pointer as family id for now */ 261ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker gf->gf_id = (uint16_t) ((uint32_t) cache); 262ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker strcpy(gf->gf_name, "nl80211"); 263ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 264ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return gf; 265ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerfail: 266ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return NULL; 267ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 268ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker} 269ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 270ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Makerint genl_ctrl_resolve(struct nl_sock *sk, const char *name) 271ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker{ 272ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker /* Hack to support wpa_supplicant */ 273ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker if (strcmp(name, "nlctrl") == 0) 274ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return NETLINK_GENERIC; 275ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker else { 276ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker int errsv = errno; 277ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker fprintf(stderr, \ 278ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker "Only nlctrl supported by genl_ctrl_resolve!\n"); 279ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker return -errsv; 280ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker } 281ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 282ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker} 283ed6b39cc7746fabdd0d01c96afcf60b9544913d3Frank Maker 284