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|
/*
* This file is part of oFono - Open Source Telephony
*
* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
*
* Contact: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
*
* 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 <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#ifndef SOL_NETLINK
#define SOL_NETLINK 270 /* libc!? */
#endif
#include "phonet.h"
#include <linux/rtnetlink.h>
#include <linux/if.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <glib.h>
#include "netlink.h"
#include "modem.h"
#ifndef ARPHRD_PHONET
#define ARPHRD_PHONET (820)
#endif
/*
* GCC -Wcast-align does not like rtlink alignment macros,
* fixed macros by Andrzej Zaborowski <balrogg@gmail.com>.
*/
#undef IFA_RTA
#define IFA_RTA(r) ((struct rtattr *)(void *)(((char *)(r)) \
+ NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
#undef IFLA_RTA
#define IFLA_RTA(r) ((struct rtattr *)(void *)(((char *)(r)) \
+ NLMSG_ALIGN(sizeof(struct ifinfomsg))))
#undef NLMSG_NEXT
#define NLMSG_NEXT(nlh, len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
(struct nlmsghdr *)(void *)(((char *)(nlh)) \
+ NLMSG_ALIGN((nlh)->nlmsg_len)))
#undef RTA_NEXT
#define RTA_NEXT(rta, attrlen) ((attrlen) -= RTA_ALIGN((rta)->rta_len), \
(struct rtattr *)(void *)(((char *)(rta)) \
+ RTA_ALIGN((rta)->rta_len)))
#define SIZE_NLMSG (16384)
struct _GPhonetNetlink {
GPhonetNetlinkFunc callback;
void *opaque;
guint watch;
unsigned interface;
};
static inline GIsiModem *make_modem(unsigned idx)
{
return (void *)(uintptr_t)idx;
}
static GSList *netlink_list;
GPhonetNetlink *g_pn_netlink_by_modem(GIsiModem *idx)
{
GSList *m;
unsigned index = g_isi_modem_index(idx);
for (m = netlink_list; m; m = m->next) {
GPhonetNetlink *self = m->data;
if (index == self->interface)
return self;
}
return NULL;
}
static void bring_up(unsigned ifindex)
{
struct ifreq req = { .ifr_ifindex = ifindex, };
int fd = socket(PF_LOCAL, SOCK_DGRAM, 0);
if (ioctl(fd, SIOCGIFNAME, &req)
|| ioctl(fd, SIOCGIFFLAGS, &req))
goto error;
req.ifr_flags |= IFF_UP | IFF_RUNNING;
ioctl(fd, SIOCSIFFLAGS, &req);
error:
close(fd);
}
static int netlink_socket(void)
{
int fd;
int bufsize = SIZE_NLMSG;
fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (fd == -1)
return -1;
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bufsize, sizeof(bufsize))) {
int error = errno;
close(fd), fd = -1;
errno = error;
}
return fd;
}
static void g_pn_nl_addr(GPhonetNetlink *self, struct nlmsghdr *nlh)
{
int len;
uint8_t local = 0xff;
uint8_t remote = 0xff;
const struct ifaddrmsg *ifa;
const struct rtattr *rta;
ifa = NLMSG_DATA(nlh);
len = IFA_PAYLOAD(nlh);
/* If Phonet is absent, kernel transmits other families... */
if (ifa->ifa_family != AF_PHONET)
return;
if (ifa->ifa_index != self->interface)
return;
for (rta = IFA_RTA(ifa); RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
if (rta->rta_type == IFA_LOCAL)
local = *(uint8_t *)RTA_DATA(rta);
else if (rta->rta_type == IFA_ADDRESS)
remote = *(uint8_t *)RTA_DATA(rta);
}
}
static void g_pn_nl_link(GPhonetNetlink *self, struct nlmsghdr *nlh)
{
const struct ifinfomsg *ifi;
const struct rtattr *rta;
int len;
const char *ifname = NULL;
GIsiModem *idx = NULL;
GPhonetLinkState st;
ifi = NLMSG_DATA(nlh);
len = IFA_PAYLOAD(nlh);
if (ifi->ifi_type != ARPHRD_PHONET)
return;
if (self->interface != 0 && self->interface != (unsigned)ifi->ifi_index)
return;
idx = make_modem(ifi->ifi_index);
#define UP (IFF_UP | IFF_LOWER_UP | IFF_RUNNING)
if (nlh->nlmsg_type == RTM_DELLINK)
st = PN_LINK_REMOVED;
else if ((ifi->ifi_flags & UP) != UP)
st = PN_LINK_DOWN;
else
st = PN_LINK_UP;
for (rta = IFLA_RTA(ifi); RTA_OK(rta, len);
rta = RTA_NEXT(rta, len)) {
if (rta->rta_type == IFLA_IFNAME)
ifname = RTA_DATA(rta);
}
if (ifname && idx)
self->callback(idx, st, ifname, self->opaque);
#undef UP
}
/* Parser Netlink messages */
static gboolean g_pn_nl_process(GIOChannel *channel, GIOCondition cond,
gpointer data)
{
struct {
struct nlmsghdr nlh;
char buf[SIZE_NLMSG];
} resp;
struct iovec iov = { &resp, sizeof(resp), };
struct msghdr msg = { .msg_iov = &iov, .msg_iovlen = 1, };
ssize_t ret;
struct nlmsghdr *nlh;
int fd = g_io_channel_unix_get_fd(channel);
GPhonetNetlink *self = data;
if (cond & (G_IO_NVAL|G_IO_HUP))
return FALSE;
ret = recvmsg(fd, &msg, 0);
if (ret == -1)
return TRUE;
if (msg.msg_flags & MSG_TRUNC) {
g_printerr("Netlink message of %zu bytes truncated at %zu\n",
ret, sizeof(resp));
return TRUE;
}
for (nlh = &resp.nlh; NLMSG_OK(nlh, (size_t)ret);
nlh = NLMSG_NEXT(nlh, ret)) {
if (nlh->nlmsg_type == NLMSG_DONE)
break;
switch (nlh->nlmsg_type) {
case NLMSG_ERROR: {
struct nlmsgerr *err = NLMSG_DATA(nlh);
if (err->error)
g_printerr("Netlink error: %s",
strerror(-err->error));
return TRUE;
}
case RTM_NEWADDR:
case RTM_DELADDR:
g_pn_nl_addr(self, nlh);
break;
case RTM_NEWLINK:
case RTM_DELLINK:
g_pn_nl_link(self, nlh);
break;
default:
continue;
}
}
return TRUE;
}
/* Dump current links */
static int g_pn_netlink_getlink(int fd)
{
struct {
struct nlmsghdr nlh;
struct ifinfomsg ifi;
} req = {
.nlh = {
.nlmsg_type = RTM_GETLINK,
.nlmsg_len = sizeof(req),
.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT | NLM_F_MATCH,
.nlmsg_pid = getpid(),
},
.ifi = {
.ifi_family = AF_UNSPEC,
.ifi_type = ARPHRD_PHONET,
.ifi_change = 0xffFFffFF,
}
};
struct sockaddr_nl addr = { .nl_family = AF_NETLINK, };
return sendto(fd, &req, sizeof(req), 0,
(struct sockaddr *)&addr, sizeof(addr));
}
GPhonetNetlink *g_pn_netlink_start(GIsiModem *idx,
GPhonetNetlinkFunc callback,
void *data)
{
GIOChannel *chan;
GPhonetNetlink *self;
int fd;
unsigned group = RTNLGRP_LINK;
unsigned interface = g_isi_modem_index(idx);
fd = netlink_socket();
if (fd == -1)
return NULL;
self = calloc(1, sizeof(*self));
if (self == NULL)
goto error;
fcntl(fd, F_SETFL, O_NONBLOCK | fcntl(fd, F_GETFL));
if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
&group, sizeof(group)))
goto error;
if (interface)
bring_up(interface);
g_pn_netlink_getlink(fd);
chan = g_io_channel_unix_new(fd);
if (chan == NULL)
goto error;
g_io_channel_set_close_on_unref(chan, TRUE);
g_io_channel_set_encoding(chan, NULL, NULL);
g_io_channel_set_buffered(chan, FALSE);
self->callback = callback;
self->opaque = data;
self->interface = interface;
self->watch = g_io_add_watch(chan, G_IO_IN|G_IO_ERR|G_IO_HUP,
g_pn_nl_process, self);
g_io_channel_unref(chan);
netlink_list = g_slist_prepend(netlink_list, self);
return self;
error:
close(fd);
free(self);
return NULL;
}
void g_pn_netlink_stop(GPhonetNetlink *self)
{
if (self) {
netlink_list = g_slist_remove(netlink_list, self);
g_source_remove(self->watch);
free(self);
}
}
static int netlink_getack(int fd)
{
struct {
struct nlmsghdr nlh;
char buf[SIZE_NLMSG];
} resp;
struct iovec iov = { &resp, sizeof(resp), };
struct msghdr msg = { .msg_iov = &iov, .msg_iovlen = 1, };
ssize_t ret;
struct nlmsghdr *nlh = &resp.nlh;
ret = recvmsg(fd, &msg, 0);
if (ret == -1)
return -errno;
if (msg.msg_flags & MSG_TRUNC)
return -EIO;
for (; NLMSG_OK(nlh, (size_t)ret); nlh = NLMSG_NEXT(nlh, ret)) {
if (nlh->nlmsg_type == NLMSG_DONE)
return 0;
if (nlh->nlmsg_type == NLMSG_ERROR) {
struct nlmsgerr *err = NLMSG_DATA(nlh);
return err->error;
}
}
return -EIO;
}
/* Set local address */
static int netlink_setaddr(uint32_t ifa_index, uint8_t ifa_local)
{
struct ifaddrmsg *ifa;
struct rtattr *rta;
uint32_t reqlen = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(*ifa))
+ RTA_SPACE(1));
struct req {
struct nlmsghdr nlh;
char buf[512];
} req = {
.nlh = {
.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
.nlmsg_type = RTM_NEWADDR,
.nlmsg_pid = getpid(),
.nlmsg_len = reqlen,
},
};
int fd;
int error;
struct sockaddr_nl addr = { .nl_family = AF_NETLINK, };
ifa = NLMSG_DATA(&req.nlh);
ifa->ifa_family = AF_PHONET;
ifa->ifa_prefixlen = 0;
ifa->ifa_index = ifa_index;
rta = IFA_RTA(ifa);
rta->rta_type = IFA_LOCAL;
rta->rta_len = RTA_LENGTH(1);
*(uint8_t *)RTA_DATA(rta) = ifa_local;
fd = netlink_socket();
if (fd == -1)
return -errno;
if (sendto(fd, &req, reqlen, 0, (void *)&addr, sizeof(addr)) == -1)
error = -errno;
else
error = netlink_getack(fd);
close(fd);
return error;
}
int g_pn_netlink_set_address(GIsiModem *idx, uint8_t local)
{
uint32_t ifindex = g_isi_modem_index(idx);
if (ifindex == 0)
return -ENODEV;
if (local != PN_DEV_PC && local != PN_DEV_SOS)
return -EINVAL;
return netlink_setaddr(ifindex, local);
}
/* Add remote address */
static int netlink_addroute(uint32_t ifa_index, uint8_t remote)
{
struct rtmsg *rtm;
struct rtattr *rta;
uint32_t reqlen = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(*rtm)) +
RTA_SPACE(1) +
RTA_SPACE(sizeof(ifa_index)));
struct req {
struct nlmsghdr nlh;
char buf[512];
} req = {
.nlh = {
.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK
| NLM_F_CREATE | NLM_F_APPEND,
.nlmsg_type = RTM_NEWROUTE,
.nlmsg_pid = getpid(),
.nlmsg_len = reqlen,
},
};
size_t buflen = sizeof(req.buf) - sizeof(*rtm);
int fd;
int error;
struct sockaddr_nl addr = { .nl_family = AF_NETLINK, };
rtm = NLMSG_DATA(&req.nlh);
rtm->rtm_family = AF_PHONET;
rtm->rtm_dst_len = 6;
rtm->rtm_src_len = 0;
rtm->rtm_tos = 0;
rtm->rtm_table = RT_TABLE_MAIN;
rtm->rtm_protocol = RTPROT_STATIC;
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
rtm->rtm_type = RTN_UNICAST;
rtm->rtm_flags = 0;
rta = IFA_RTA(rtm);
rta->rta_type = RTA_DST;
rta->rta_len = RTA_LENGTH(1);
*(uint8_t *)RTA_DATA(rta) = remote;
rta = RTA_NEXT(rta, buflen);
rta->rta_type = RTA_OIF;
rta->rta_len = RTA_LENGTH(sizeof(ifa_index));
*(uint32_t *)RTA_DATA(rta) = ifa_index;
fd = netlink_socket();
if (fd == -1)
return -errno;
if (sendto(fd, &req, reqlen, 0, (void *)&addr, sizeof(addr)) == -1)
error = -errno;
else
error = netlink_getack(fd);
close(fd);
return error;
}
int g_pn_netlink_add_route(GIsiModem *idx, uint8_t remote)
{
uint32_t ifindex = g_isi_modem_index(idx);
if (ifindex == 0)
return -ENODEV;
if (remote != PN_DEV_SOS && remote != PN_DEV_HOST)
return -EINVAL;
return netlink_addroute(ifindex, remote);
}
|