5:40 a.m.
From: Sjur Brændeland <sjur.brandeland(a)stericsson.com>
---
Hi Marcel.
I hope I have closed most of your review comments so far.
I had a go at using g_io_chanel_write_chars, but couldn't make it work,
and I (stubbornly ;-) do g_caif_devices = NULL, just in case someone choose
to call caif_rtnl_init more than once.
Makefile.am | 2 +
drivers/stemodem/caif_rtnl.c | 382 ++++++++++++++++++++++++++++++++++++++++++
drivers/stemodem/caif_rtnl.h | 29 ++++
3 files changed, 413 insertions(+), 0 deletions(-)
create mode 100644 drivers/stemodem/caif_rtnl.c
create mode 100644 drivers/stemodem/caif_rtnl.h
diff --git a/Makefile.am b/Makefile.am
index cd17fa2..aea91ce 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -226,6 +226,8 @@ builtin_sources += drivers/atmodem/atutil.h \
drivers/stemodem/stemodem.c \
drivers/stemodem/voicecall.c \
drivers/stemodem/radio-settings.c \
+ drivers/stemodem/caif_rtnl.c \
+ drivers/stemodem/caif_rtnl.h \
drivers/stemodem/gprs-context.c \
drivers/stemodem/caif_socket.h \
drivers/stemodem/if_caif.h
diff --git a/drivers/stemodem/caif_rtnl.c b/drivers/stemodem/caif_rtnl.c
new file mode 100644
index 0000000..82740ba
--- /dev/null
+++ b/drivers/stemodem/caif_rtnl.c
@@ -0,0 +1,382 @@
+/*
+ *
+ * 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)))
+
+struct iplink_req {
+ struct nlmsghdr n;
+ struct ifinfomsg i;
+ char pad[1024];
+
+ int request_id;
+ int type;
+ int conn_id;
+ gpointer user_data;
+ gboolean loop_enabled;
+
+ char ifname[IF_NAMESIZE];
+ int ifindex;
+ caif_rtnl_create_cb_t callback;
+};
+
+static GSList *pending_requests;
+static guint32 rtnl_seqnr;
+static guint rtnl_watch;
+static GIOChannel *channel;
+
+static gboolean get_ifname(struct ifinfomsg *msg, int bytes,
+ const char **ifname)
+{
+ struct rtattr *attr;
+
+ for (attr = IFLA_RTA(msg); RTA_OK(attr, bytes);
+ attr = RTA_NEXT(attr, bytes)) {
+
+ if (attr->rta_type == IFLA_IFNAME &&
+ ifname != NULL) {
+
+ *ifname = RTA_DATA(attr);
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+static void store_newlink_param(struct iplink_req *req, unsigned short type,
+ int index, unsigned flags,
+ unsigned change, struct ifinfomsg *msg,
+ int bytes)
+{
+ const char *ifname = NULL;
+
+ get_ifname(msg, bytes, &ifname);
+ strncpy(req->ifname, ifname,
+ sizeof(req->ifname));
+ req->ifname[sizeof(req->ifname)-1] = '\0';
+ req->ifindex = index;
+}
+
+static int send_rtnl_req(struct iplink_req *req)
+{
+ struct sockaddr_nl addr;
+ int sk = g_io_channel_unix_get_fd(channel);
+
+ memset(&addr, 0, sizeof(addr));
+ addr.nl_family = AF_NETLINK;
+
+ return sendto(sk, req, req->n.nlmsg_len, 0,
+ (struct sockaddr *) &addr, sizeof(addr));
+}
+
+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->n.nlmsg_seq == seq)
+ return req;
+ }
+
+ return NULL;
+}
+
+static void rtnl_client_response(struct iplink_req *req, int result)
+{
+
+ if (req->callback && req->n.nlmsg_type == RTM_NEWLINK)
+ req->callback(result, req->user_data,
+ req->ifname, req->ifindex);
+
+ pending_requests = g_slist_remove(pending_requests, req);
+ g_free(req);
+}
+
+static void parse_rtnl_message(void *buf, size_t len)
+{
+ struct ifinfomsg *msg;
+ struct iplink_req *req;
+
+ while (len > 0) {
+ struct nlmsghdr *hdr = buf;
+
+ if (!NLMSG_OK(hdr, len))
+ break;
+
+ if (hdr->nlmsg_type == RTM_NEWLINK) {
+ req = g_slist_nth_data(pending_requests, 0);
+ if (req == NULL)
+ break;
+
+ msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
+ store_newlink_param(req, msg->ifi_type,
+ msg->ifi_index, msg->ifi_flags,
+ msg->ifi_change, msg,
+ IFA_PAYLOAD(hdr));
+ rtnl_client_response(req, 0);
+ return;
+
+ } else if (hdr->nlmsg_type == NLMSG_ERROR) {
+ req = find_request(hdr->nlmsg_seq);
+ if (req == NULL)
+ break;
+
+ DBG("nlmsg error req");
+ rtnl_client_response(req, -1);
+ return;
+ }
+
+ len -= hdr->nlmsg_len;
+ buf += hdr->nlmsg_len;
+ }
+}
+
+static int add_attribute(struct nlmsghdr *n, int maxlen, int type,
+ const void *data, int datalen)
+{
+ int len = RTA_LENGTH(datalen);
+ struct rtattr *rta;
+
+ if ((int)(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 int prep_rtnl_newlink_req(struct iplink_req *req)
+{
+ char type[] = "caif";
+ struct rtattr *linkinfo;
+ struct rtattr *data;
+
+ req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ req->n.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_EXCL;
+ req->n.nlmsg_type = RTM_NEWLINK;
+ req->n.nlmsg_seq = ++rtnl_seqnr;
+ req->i.ifi_family = AF_UNSPEC;
+
+ linkinfo = NLMSG_TAIL(&req->n);
+ add_attribute(&req->n, sizeof(*req), IFLA_LINKINFO,
+ NULL, 0);
+ add_attribute(&req->n, sizeof(*req), IFLA_INFO_KIND,
+ type, strlen(type));
+ data = NLMSG_TAIL(&req->n);
+ add_attribute(&req->n, sizeof(*req), IFLA_INFO_DATA,
+ NULL, 0);
+
+ switch (req->type) {
+
+ case IFLA_CAIF_IPV4_CONNID:
+ add_attribute(&req->n, sizeof(*req),
+ IFLA_CAIF_IPV4_CONNID, &req->conn_id,
+ sizeof(req->conn_id));
+ break;
+
+ case IFLA_CAIF_IPV6_CONNID:
+ add_attribute(&req->n, sizeof(*req),
+ IFLA_CAIF_IPV6_CONNID, &req->conn_id,
+ sizeof(req->conn_id));
+ break;
+
+ case __IFLA_CAIF_UNSPEC:
+ case IFLA_CAIF_LOOPBACK:
+ case __IFLA_CAIF_MAX:
+ DBG("unsupported linktype");
+ return -EINVAL;
+ }
+
+ if (req->loop_enabled) {
+ int loop = 1;
+ add_attribute(&req->n, sizeof(*req),
+ IFLA_CAIF_LOOPBACK, &loop, sizeof(loop));
+ }
+
+ data->rta_len = (void *)NLMSG_TAIL(&req->n) - (void *)data;
+ linkinfo->rta_len = (void *)NLMSG_TAIL(&req->n) - (void *)linkinfo;
+
+ return 0;
+}
+
+static void prep_rtnl_dellink_req(struct iplink_req *req, int ifindex)
+{
+ req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ req->n.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_EXCL;
+ req->n.nlmsg_type = RTM_DELLINK;
+ req->n.nlmsg_seq = ++rtnl_seqnr;
+ req->i.ifi_family = AF_UNSPEC;
+ req->i.ifi_index = ifindex;
+}
+
+static gboolean netlink_event(GIOChannel *chan,
+ GIOCondition cond, gpointer data)
+{
+ unsigned char buf[4096];
+ gsize len;
+ GIOError err;
+
+ if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR)) {
+ rtnl_watch = 0;
+ return FALSE;
+ }
+
+ memset(buf, 0, sizeof(buf));
+
+ err = g_io_channel_read(chan, (gchar *) buf, sizeof(buf), &len);
+ if (err) {
+ if (err == G_IO_ERROR_AGAIN)
+ 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;
+ GError *gerr = NULL;
+
+ 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 | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE;
+
+ err = bind(sk, (struct sockaddr *) &addr, sizeof(addr));
+ if (err < 0) {
+ close(sk);
+ return err;
+ }
+
+ channel = g_io_channel_unix_new(sk);
+ g_io_channel_set_flags(channel, G_IO_FLAG_NONBLOCK, &gerr);
+ g_io_channel_set_encoding(channel, NULL, &gerr);
+ g_io_channel_set_buffered(channel, TRUE);
+ g_io_channel_set_close_on_unref(channel, TRUE);
+
+ rtnl_watch = g_io_add_watch(channel,
+ G_IO_IN | G_IO_NVAL | G_IO_HUP | G_IO_ERR,
+ netlink_event, NULL);
+ pending_requests = NULL;
+
+ return 0;
+}
+
+void caif_rtnl_exit(void)
+{
+ GSList *list;
+
+ if (rtnl_watch > 0)
+ g_source_remove(rtnl_watch);
+
+ g_io_channel_unref(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(gpointer user_data, int type, int connid,
+ gboolean loop, caif_rtnl_create_cb_t cb)
+{
+ int err;
+ struct iplink_req *req;
+
+ req = g_try_new0(struct iplink_req, 1);
+ if (req == NULL)
+ return -ENOMEM;
+
+ req->user_data = user_data;
+ req->type = type;
+ req->conn_id = connid;
+ req->loop_enabled = loop;
+ req->callback = cb;
+
+ err = prep_rtnl_newlink_req(req);
+ if (err < 0)
+ goto error;
+
+ err = send_rtnl_req(req);
+ 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 iplink_req req;
+ int err;
+ memset(&req, 0, sizeof(req));
+ prep_rtnl_dellink_req(&req, ifid);
+
+ err = send_rtnl_req(&req);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
diff --git a/drivers/stemodem/caif_rtnl.h b/drivers/stemodem/caif_rtnl.h
new file mode 100644
index 0000000..8eb1e5f
--- /dev/null
+++ b/drivers/stemodem/caif_rtnl.h
@@ -0,0 +1,29 @@
+/*
+ *
+ * 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
+ *
+ */
+typedef void (*caif_rtnl_create_cb_t) (int result, gpointer user_data,
+ char *ifname, int ifindex);
+
+extern int caif_rtnl_create_interface(gpointer user_data, int type, int connid,
+ gboolean loop, caif_rtnl_create_cb_t cb);
+extern int caif_rtnl_delete_interface(int ifid);
+
+extern int caif_rtnl_init(void);
+extern void caif_rtnl_exit(void);
--
1.6.3.3