wpa_supplicant: Initial Revision 0.8.X
Based on:
commit 0725cc7b7efc434910e89865c42eda7ce61bbf08
Author: Jouni Malinen <j@w1.fi>
Date: Thu Apr 21 20:41:01 2011 +0300
Enable CONFIG_DRIVER_NL80211=y in the default configuration
nl80211 should be preferred over WEXT with any recent Linux
kernel version.
Change-Id: I26aec5afbbd4f4a1f5fd900912545b6f5050de64
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/src/drivers/netlink.c b/src/drivers/netlink.c
new file mode 100644
index 0000000..ad15b1d
--- /dev/null
+++ b/src/drivers/netlink.c
@@ -0,0 +1,204 @@
+/*
+ * Netlink helper functions for driver wrappers
+ * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "eloop.h"
+#include "priv_netlink.h"
+#include "netlink.h"
+
+
+struct netlink_data {
+ struct netlink_config *cfg;
+ int sock;
+};
+
+
+static void netlink_receive_link(struct netlink_data *netlink,
+ void (*cb)(void *ctx, struct ifinfomsg *ifi,
+ u8 *buf, size_t len),
+ struct nlmsghdr *h)
+{
+ if (cb == NULL || NLMSG_PAYLOAD(h, 0) < sizeof(struct ifinfomsg))
+ return;
+ cb(netlink->cfg->ctx, NLMSG_DATA(h),
+ NLMSG_DATA(h) + NLMSG_ALIGN(sizeof(struct ifinfomsg)),
+ NLMSG_PAYLOAD(h, sizeof(struct ifinfomsg)));
+}
+
+
+static void netlink_receive(int sock, void *eloop_ctx, void *sock_ctx)
+{
+ struct netlink_data *netlink = eloop_ctx;
+ char buf[8192];
+ int left;
+ struct sockaddr_nl from;
+ socklen_t fromlen;
+ struct nlmsghdr *h;
+ int max_events = 10;
+
+try_again:
+ fromlen = sizeof(from);
+ left = recvfrom(sock, buf, sizeof(buf), MSG_DONTWAIT,
+ (struct sockaddr *) &from, &fromlen);
+ if (left < 0) {
+ if (errno != EINTR && errno != EAGAIN)
+ wpa_printf(MSG_INFO, "netlink: recvfrom failed: %s",
+ strerror(errno));
+ return;
+ }
+
+ h = (struct nlmsghdr *) buf;
+ while (NLMSG_OK(h, left)) {
+ switch (h->nlmsg_type) {
+ case RTM_NEWLINK:
+ netlink_receive_link(netlink, netlink->cfg->newlink_cb,
+ h);
+ break;
+ case RTM_DELLINK:
+ netlink_receive_link(netlink, netlink->cfg->dellink_cb,
+ h);
+ break;
+ }
+
+ h = NLMSG_NEXT(h, left);
+ }
+
+ if (left > 0) {
+ wpa_printf(MSG_DEBUG, "netlink: %d extra bytes in the end of "
+ "netlink message", left);
+ }
+
+ if (--max_events > 0) {
+ /*
+ * Try to receive all events in one eloop call in order to
+ * limit race condition on cases where AssocInfo event, Assoc
+ * event, and EAPOL frames are received more or less at the
+ * same time. We want to process the event messages first
+ * before starting EAPOL processing.
+ */
+ goto try_again;
+ }
+}
+
+
+struct netlink_data * netlink_init(struct netlink_config *cfg)
+{
+ struct netlink_data *netlink;
+ struct sockaddr_nl local;
+
+ netlink = os_zalloc(sizeof(*netlink));
+ if (netlink == NULL)
+ return NULL;
+
+ netlink->cfg = cfg;
+
+ netlink->sock = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (netlink->sock < 0) {
+ wpa_printf(MSG_ERROR, "netlink: Failed to open netlink "
+ "socket: %s", strerror(errno));
+ netlink_deinit(netlink);
+ return NULL;
+ }
+
+ os_memset(&local, 0, sizeof(local));
+ local.nl_family = AF_NETLINK;
+ local.nl_groups = RTMGRP_LINK;
+ if (bind(netlink->sock, (struct sockaddr *) &local, sizeof(local)) < 0)
+ {
+ wpa_printf(MSG_ERROR, "netlink: Failed to bind netlink "
+ "socket: %s", strerror(errno));
+ netlink_deinit(netlink);
+ return NULL;
+ }
+
+ eloop_register_read_sock(netlink->sock, netlink_receive, netlink,
+ NULL);
+
+ return netlink;
+}
+
+
+void netlink_deinit(struct netlink_data *netlink)
+{
+ if (netlink == NULL)
+ return;
+ if (netlink->sock >= 0) {
+ eloop_unregister_read_sock(netlink->sock);
+ close(netlink->sock);
+ }
+ os_free(netlink->cfg);
+ os_free(netlink);
+}
+
+int netlink_send_oper_ifla(struct netlink_data *netlink, int ifindex,
+ int linkmode, int operstate)
+{
+ struct {
+ struct nlmsghdr hdr;
+ struct ifinfomsg ifinfo;
+ char opts[16];
+ } req;
+ struct rtattr *rta;
+ static int nl_seq;
+ ssize_t ret;
+
+ os_memset(&req, 0, sizeof(req));
+
+ req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ req.hdr.nlmsg_type = RTM_SETLINK;
+ req.hdr.nlmsg_flags = NLM_F_REQUEST;
+ req.hdr.nlmsg_seq = ++nl_seq;
+ req.hdr.nlmsg_pid = 0;
+
+ req.ifinfo.ifi_family = AF_UNSPEC;
+ req.ifinfo.ifi_type = 0;
+ req.ifinfo.ifi_index = ifindex;
+ req.ifinfo.ifi_flags = 0;
+ req.ifinfo.ifi_change = 0;
+
+ if (linkmode != -1) {
+ rta = aliasing_hide_typecast(
+ ((char *) &req + NLMSG_ALIGN(req.hdr.nlmsg_len)),
+ struct rtattr);
+ rta->rta_type = IFLA_LINKMODE;
+ rta->rta_len = RTA_LENGTH(sizeof(char));
+ *((char *) RTA_DATA(rta)) = linkmode;
+ req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
+ RTA_LENGTH(sizeof(char));
+ }
+ if (operstate != -1) {
+ rta = aliasing_hide_typecast(
+ ((char *) &req + NLMSG_ALIGN(req.hdr.nlmsg_len)),
+ struct rtattr);
+ rta->rta_type = IFLA_OPERSTATE;
+ rta->rta_len = RTA_LENGTH(sizeof(char));
+ *((char *) RTA_DATA(rta)) = operstate;
+ req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
+ RTA_LENGTH(sizeof(char));
+ }
+
+ wpa_printf(MSG_DEBUG, "netlink: Operstate: linkmode=%d, operstate=%d",
+ linkmode, operstate);
+
+ ret = send(netlink->sock, &req, req.hdr.nlmsg_len, 0);
+ if (ret < 0) {
+ wpa_printf(MSG_DEBUG, "netlink: Sending operstate IFLA "
+ "failed: %s (assume operstate is not supported)",
+ strerror(errno));
+ }
+
+ return ret < 0 ? -1 : 0;
+}