--- /dev/null
+/*
+ *
+ * oFono - Open Source Telephony
+ *
+ * Copyright (C) 2010 ST-Ericsson AB.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <fcntl.h>
+#include <linux/rtnetlink.h>
+
+#include <glib.h>
+
+#include <ofono/log.h>
+
+#include "if_caif.h"
+#include "caif_rtnl.h"
+
+#define NLMSG_TAIL(nmsg) \
+ ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
+
+#define RTNL_MSG_SIZE 4096
+
+struct rtnl_msg {
+ struct nlmsghdr n;
+ struct ifinfomsg i;
+ char data[RTNL_MSG_SIZE];
+};
+
+struct iplink_req {
+ guint32 rtnlmsg_seqnr;
+ gpointer user_data;
+ caif_rtnl_create_cb_t callback;
+};
+
+static GSList *pending_requests;
+static guint32 rtnl_seqnr;
+static guint rtnl_watch;
+static GIOChannel *rtnl_channel;
+
+static struct iplink_req *find_request(guint32 seq)
+{
+ GSList *list;
+
+ for (list = pending_requests; list; list = list->next) {
+ struct iplink_req *req = list->data;
+
+ if (req->rtnlmsg_seqnr == seq)
+ return req;
+ }
+
+ return NULL;
+}
+
+static void parse_newlink_param(struct ifinfomsg *msg, int size,
+ int *ifindex, char *ifname)
+{
+ struct rtattr *attr;
+
+ for (attr = IFLA_RTA(msg); RTA_OK(attr, size);
+ attr = RTA_NEXT(attr, size)) {
+
+ if (attr->rta_type == IFLA_IFNAME &&
+ ifname != NULL) {
+
+ strncpy(ifname, RTA_DATA(attr), IF_NAMESIZE);
+ ifname[IF_NAMESIZE-1] = '\0';
+ break;
+ }
+ }
+
+ *ifindex = msg->ifi_index;
+}
+
+static void parse_rtnl_message(const void *buf, size_t len)
+{
+ struct ifinfomsg *msg;
+ struct iplink_req *req = NULL;
+ char ifname[IF_NAMESIZE];
+ int ifindex;
+
+ while (len > 0) {
+ const struct nlmsghdr *hdr = buf;
+
+ if (!NLMSG_OK(hdr, len))
+ break;
+
+ switch (hdr->nlmsg_type) {
+ case RTM_NEWLINK:
+ req = g_slist_nth_data(pending_requests, 0);
+ if (req == NULL)
+ break;
+
+ msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
+ parse_newlink_param(msg, IFA_PAYLOAD(hdr),
+ &ifindex, ifname);
+
+ if (req->callback)
+ req->callback(ifindex, ifname, req->user_data);
+ break;
+
+ case NLMSG_ERROR:
+ req = find_request(hdr->nlmsg_seq);
+ if (req == NULL)
+ break;
+
+ DBG("nlmsg error req");
+ if (req->callback)
+ req->callback(-1, ifname, req->user_data);
+ break;
+ default:
+ break;
+ }
+
+ len -= hdr->nlmsg_len;
+ buf += hdr->nlmsg_len;
+
+ if (req) {
+ pending_requests = g_slist_remove(pending_requests,
+ req);
+ g_free(req);
+ req = NULL;
+ }
+ }
+}
+
+static int add_attribute(struct nlmsghdr *n, unsigned int maxlen, int type,
+ const void *data, int datalen)
+{
+ int len = RTA_LENGTH(datalen);
+ struct rtattr *rta;
+
+ if ((NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len)) > maxlen) {
+ DBG("attribute to large for message %d %d %d\n",
+ n->nlmsg_len, len, maxlen);
+ return -1;
+ }
+
+ rta = NLMSG_TAIL(n);
+ rta->rta_type = type;
+ rta->rta_len = len;
+ memcpy(RTA_DATA(rta), data, datalen);
+ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
+
+ return 0;
+}
+
+static void prep_rtnl_req(struct rtnl_msg *msg, int reqtype, guint seqnr)
+{
+ msg->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ msg->n.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_EXCL;
+ msg->n.nlmsg_type = reqtype;
+ msg->n.nlmsg_seq = seqnr;
+ msg->i.ifi_family = AF_UNSPEC;
+}
+
+static gboolean netlink_event(GIOChannel *chan,
+ GIOCondition cond, gpointer data)
+{
+ unsigned char buf[RTNL_MSG_SIZE];
+ int len;
+ int sk = g_io_channel_unix_get_fd(rtnl_channel);
+
+ if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR)) {
+ rtnl_watch = 0;
+ return FALSE;
+ }
+
+ memset(buf, 0, sizeof(buf));
+ len = recv(sk, (void *)&buf, sizeof(buf), MSG_DONTWAIT);
+ if (len < 0) {
+ if (len == -EAGAIN)
+ return TRUE;
+ rtnl_watch = 0;
+ return FALSE;
+ }
+
+ parse_rtnl_message(buf, len);
+
+ return TRUE;
+}
+
+int caif_rtnl_init(void)
+{
+ struct sockaddr_nl addr;
+ int sk, err;
+
+ sk = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (sk < 0)
+ return sk;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.nl_family = AF_NETLINK;
+ addr.nl_groups = RTMGRP_LINK;
+
+ err = bind(sk, (struct sockaddr *) &addr, sizeof(addr));
+ if (err < 0) {
+ close(sk);
+ return err;
+ }
+
+ rtnl_channel = g_io_channel_unix_new(sk);
+ g_io_channel_set_flags(rtnl_channel, G_IO_FLAG_NONBLOCK, NULL);
+ g_io_channel_set_close_on_unref(rtnl_channel, TRUE);
+
+ rtnl_watch = g_io_add_watch(rtnl_channel,
+ G_IO_IN | G_IO_NVAL | G_IO_HUP | G_IO_ERR,
+ netlink_event, NULL);
+
+ return 0;
+}
+
+void caif_rtnl_exit(void)
+{
+ GSList *list;
+
+ if (rtnl_watch > 0)
+ g_source_remove(rtnl_watch);
+
+ g_io_channel_unref(rtnl_channel);
+
+ for (list = pending_requests; list; list = list->next) {
+ struct iplink_req *req = list->data;
+ g_free(req);
+ }
+
+ g_slist_free(pending_requests);
+}
+
+int caif_rtnl_create_interface(int type, int connid, int loop,
+ caif_rtnl_create_cb_t cb, void *user_data)
+{
+ struct iplink_req *req;
+ struct sockaddr_nl addr;
+ int err, sk;
+ struct rtnl_msg msg;
+ struct rtattr *linkinfo;
+ struct rtattr *data_start;
+
+ req = g_try_new0(struct iplink_req, 1);
+ if (req == NULL)
+ return -ENOMEM;
+
+ req->user_data = user_data;
+ req->callback = cb;
+ memset(&msg, 0, RTNL_MSG_SIZE);
+
+ req->rtnlmsg_seqnr = ++rtnl_seqnr;
+ prep_rtnl_req(&msg, RTM_NEWLINK, req->rtnlmsg_seqnr);
+
+ linkinfo = NLMSG_TAIL(&msg.n);
+ add_attribute(&msg.n, sizeof(msg), IFLA_LINKINFO,
+ NULL, 0);
+ add_attribute(&msg.n, sizeof(msg), IFLA_INFO_KIND,
+ "caif", 4);
+ data_start = NLMSG_TAIL(&msg.n);
+ add_attribute(&msg.n, sizeof(msg), IFLA_INFO_DATA,
+ NULL, 0);
+
+ switch (type) {
+ case IFLA_CAIF_IPV4_CONNID:
+ case IFLA_CAIF_IPV6_CONNID:
+ add_attribute(&msg.n, sizeof(msg),
+ type, &connid,
+ sizeof(connid));
+ break;
+
+ case __IFLA_CAIF_UNSPEC:
+ case IFLA_CAIF_LOOPBACK:
+ case __IFLA_CAIF_MAX:
+ DBG("unsupported linktype");
+ return -EINVAL;
+ }
+
+ if (loop) {
+ add_attribute(&msg.n, sizeof(msg),
+ IFLA_CAIF_LOOPBACK, &loop, sizeof(loop));
+ }
+
+ data_start->rta_len = (void *)NLMSG_TAIL(&msg.n) - (void *)data_start;
+ linkinfo->rta_len = (void *)NLMSG_TAIL(&msg.n) - (void *)linkinfo;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.nl_family = AF_NETLINK;
+ sk = g_io_channel_unix_get_fd(rtnl_channel);
+ err = sendto(sk, &msg, msg.n.nlmsg_len, 0,
+ (struct sockaddr *) &addr, sizeof(addr));
+ if (err < 0)
+ goto error;
+
+ pending_requests = g_slist_append(pending_requests, req);
+ return 0;
+
+error:
+ g_free(req);
+ return err;
+}
+
+int caif_rtnl_delete_interface(int ifid)
+{
+ struct sockaddr_nl addr;
+ struct rtnl_msg msg;
+ int err;
+ int sk = g_io_channel_unix_get_fd(rtnl_channel);
+
+ memset(&msg, 0, sizeof(msg));
+ prep_rtnl_req(&msg, RTM_DELLINK, ++rtnl_seqnr);
+ msg.i.ifi_index = ifid;
+ memset(&addr, 0, sizeof(addr));
+ addr.nl_family = AF_NETLINK;
+
+ err = sendto(sk, &msg, msg.n.nlmsg_len, 0,
+ (struct sockaddr *) &addr, sizeof(addr));
+ if (err < 0)
+ return err;
+
+ return 0;
+}
projects / platform / upstream / ofono.git / commitdiff