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linux/net/l2tp/l2tp_netlink.c
Neil Horman e9412c3708 genetlink: Build a generic netlink family module alias 
Generic netlink searches for -type- formatted aliases when requesting a module to
fulfill a protocol request (i.e. net-pf-16-proto-16-type-<x>, where x is a type
value).  However generic netlink protocols have no well defined type numbers,
they have string names.  Modify genl_ctrl_getfamily to request an alias in the
format net-pf-16-proto-16-family-<x> instead, where x is a generic string, and
add a macro that builds on the previously added MODULE_ALIAS_NET_PF_PROTO_NAME
macro to allow modules to specifify those generic strings.

Note, l2tp previously hacked together an net-pf-16-proto-16-type-l2tp alias
using the MODULE_ALIAS macro, with these updates we can convert that to use the
PROTO_NAME macro.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: James Chapman <jchapman@katalix.com>
CC: David Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-29 22:33:56 -04:00

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/*
* L2TP netlink layer, for management
*
* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
*
* Partly based on the IrDA nelink implementation
* (see net/irda/irnetlink.c) which is:
* Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
* which is in turn partly based on the wireless netlink code:
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*
* 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <net/sock.h>
#include <net/genetlink.h>
#include <net/udp.h>
#include <linux/in.h>
#include <linux/udp.h>
#include <linux/socket.h>
#include <linux/module.h>
#include <linux/list.h>
#include <net/net_namespace.h>
#include <linux/l2tp.h>
#include "l2tp_core.h"
static struct genl_family l2tp_nl_family = {
.id = GENL_ID_GENERATE,
.name = L2TP_GENL_NAME,
.version = L2TP_GENL_VERSION,
.hdrsize = 0,
.maxattr = L2TP_ATTR_MAX,
};
/* Accessed under genl lock */
static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
{
u32 tunnel_id;
u32 session_id;
char *ifname;
struct l2tp_tunnel *tunnel;
struct l2tp_session *session = NULL;
struct net *net = genl_info_net(info);
if (info->attrs[L2TP_ATTR_IFNAME]) {
ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
session = l2tp_session_find_by_ifname(net, ifname);
} else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
(info->attrs[L2TP_ATTR_CONN_ID])) {
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
tunnel = l2tp_tunnel_find(net, tunnel_id);
if (tunnel)
session = l2tp_session_find(net, tunnel, session_id);
}
return session;
}
static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *msg;
void *hdr;
int ret = -ENOBUFS;
msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg) {
ret = -ENOMEM;
goto out;
}
hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
&l2tp_nl_family, 0, L2TP_CMD_NOOP);
if (IS_ERR(hdr)) {
ret = PTR_ERR(hdr);
goto err_out;
}
genlmsg_end(msg, hdr);
return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
err_out:
nlmsg_free(msg);
out:
return ret;
}
static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
{
u32 tunnel_id;
u32 peer_tunnel_id;
int proto_version;
int fd;
int ret = 0;
struct l2tp_tunnel_cfg cfg = { 0, };
struct l2tp_tunnel *tunnel;
struct net *net = genl_info_net(info);
if (!info->attrs[L2TP_ATTR_CONN_ID]) {
ret = -EINVAL;
goto out;
}
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
ret = -EINVAL;
goto out;
}
peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
ret = -EINVAL;
goto out;
}
proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
ret = -EINVAL;
goto out;
}
cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
fd = -1;
if (info->attrs[L2TP_ATTR_FD]) {
fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
} else {
#if IS_ENABLED(CONFIG_IPV6)
if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
info->attrs[L2TP_ATTR_IP6_DADDR]) {
cfg.local_ip6 = nla_data(
info->attrs[L2TP_ATTR_IP6_SADDR]);
cfg.peer_ip6 = nla_data(
info->attrs[L2TP_ATTR_IP6_DADDR]);
} else
#endif
if (info->attrs[L2TP_ATTR_IP_SADDR] &&
info->attrs[L2TP_ATTR_IP_DADDR]) {
cfg.local_ip.s_addr = nla_get_be32(
info->attrs[L2TP_ATTR_IP_SADDR]);
cfg.peer_ip.s_addr = nla_get_be32(
info->attrs[L2TP_ATTR_IP_DADDR]);
} else {
ret = -EINVAL;
goto out;
}
if (info->attrs[L2TP_ATTR_UDP_SPORT])
cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
if (info->attrs[L2TP_ATTR_UDP_DPORT])
cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
if (info->attrs[L2TP_ATTR_UDP_CSUM])
cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
}
if (info->attrs[L2TP_ATTR_DEBUG])
cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
tunnel = l2tp_tunnel_find(net, tunnel_id);
if (tunnel != NULL) {
ret = -EEXIST;
goto out;
}
ret = -EINVAL;
switch (cfg.encap) {
case L2TP_ENCAPTYPE_UDP:
case L2TP_ENCAPTYPE_IP:
ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
peer_tunnel_id, &cfg, &tunnel);
break;
}
out:
return ret;
}
static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
{
struct l2tp_tunnel *tunnel;
u32 tunnel_id;
int ret = 0;
struct net *net = genl_info_net(info);
if (!info->attrs[L2TP_ATTR_CONN_ID]) {
ret = -EINVAL;
goto out;
}
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
tunnel = l2tp_tunnel_find(net, tunnel_id);
if (tunnel == NULL) {
ret = -ENODEV;
goto out;
}
(void) l2tp_tunnel_delete(tunnel);
out:
return ret;
}
static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
{
struct l2tp_tunnel *tunnel;
u32 tunnel_id;
int ret = 0;
struct net *net = genl_info_net(info);
if (!info->attrs[L2TP_ATTR_CONN_ID]) {
ret = -EINVAL;
goto out;
}
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
tunnel = l2tp_tunnel_find(net, tunnel_id);
if (tunnel == NULL) {
ret = -ENODEV;
goto out;
}
if (info->attrs[L2TP_ATTR_DEBUG])
tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
out:
return ret;
}
static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
struct l2tp_tunnel *tunnel)
{
void *hdr;
struct nlattr *nest;
struct sock *sk = NULL;
struct inet_sock *inet;
#if IS_ENABLED(CONFIG_IPV6)
struct ipv6_pinfo *np = NULL;
#endif
struct l2tp_stats stats;
unsigned int start;
hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags,
L2TP_CMD_TUNNEL_GET);
if (IS_ERR(hdr))
return PTR_ERR(hdr);
if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
goto nla_put_failure;
nest = nla_nest_start(skb, L2TP_ATTR_STATS);
if (nest == NULL)
goto nla_put_failure;
do {
start = u64_stats_fetch_begin(&tunnel->stats.syncp);
stats.tx_packets = tunnel->stats.tx_packets;
stats.tx_bytes = tunnel->stats.tx_bytes;
stats.tx_errors = tunnel->stats.tx_errors;
stats.rx_packets = tunnel->stats.rx_packets;
stats.rx_bytes = tunnel->stats.rx_bytes;
stats.rx_errors = tunnel->stats.rx_errors;
stats.rx_seq_discards = tunnel->stats.rx_seq_discards;
stats.rx_oos_packets = tunnel->stats.rx_oos_packets;
} while (u64_stats_fetch_retry(&tunnel->stats.syncp, start));
if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) ||
nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) ||
nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
stats.rx_seq_discards) ||
nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
stats.rx_oos_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors))
goto nla_put_failure;
nla_nest_end(skb, nest);
sk = tunnel->sock;
if (!sk)
goto out;
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6)
np = inet6_sk(sk);
#endif
inet = inet_sk(sk);
switch (tunnel->encap) {
case L2TP_ENCAPTYPE_UDP:
if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) ||
nla_put_u8(skb, L2TP_ATTR_UDP_CSUM,
(sk->sk_no_check != UDP_CSUM_NOXMIT)))
goto nla_put_failure;
/* NOBREAK */
case L2TP_ENCAPTYPE_IP:
#if IS_ENABLED(CONFIG_IPV6)
if (np) {
if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr),
&np->saddr) ||
nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(np->daddr),
&np->daddr))
goto nla_put_failure;
} else
#endif
if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
goto nla_put_failure;
break;
}
out:
return genlmsg_end(skb, hdr);
nla_put_failure:
genlmsg_cancel(skb, hdr);
return -1;
}
static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
{
struct l2tp_tunnel *tunnel;
struct sk_buff *msg;
u32 tunnel_id;
int ret = -ENOBUFS;
struct net *net = genl_info_net(info);
if (!info->attrs[L2TP_ATTR_CONN_ID]) {
ret = -EINVAL;
goto out;
}
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
tunnel = l2tp_tunnel_find(net, tunnel_id);
if (tunnel == NULL) {
ret = -ENODEV;
goto out;
}
msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg) {
ret = -ENOMEM;
goto out;
}
ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq,
NLM_F_ACK, tunnel);
if (ret < 0)
goto err_out;
return genlmsg_unicast(net, msg, info->snd_pid);
err_out:
nlmsg_free(msg);
out:
return ret;
}
static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int ti = cb->args[0];
struct l2tp_tunnel *tunnel;
struct net *net = sock_net(skb->sk);
for (;;) {
tunnel = l2tp_tunnel_find_nth(net, ti);
if (tunnel == NULL)
goto out;
if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
tunnel) <= 0)
goto out;
ti++;
}
out:
cb->args[0] = ti;
return skb->len;
}
static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
{
u32 tunnel_id = 0;
u32 session_id;
u32 peer_session_id;
int ret = 0;
struct l2tp_tunnel *tunnel;
struct l2tp_session *session;
struct l2tp_session_cfg cfg = { 0, };
struct net *net = genl_info_net(info);
if (!info->attrs[L2TP_ATTR_CONN_ID]) {
ret = -EINVAL;
goto out;
}
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
tunnel = l2tp_tunnel_find(net, tunnel_id);
if (!tunnel) {
ret = -ENODEV;
goto out;
}
if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
ret = -EINVAL;
goto out;
}
session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
session = l2tp_session_find(net, tunnel, session_id);
if (session) {
ret = -EEXIST;
goto out;
}
if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
ret = -EINVAL;
goto out;
}
peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
ret = -EINVAL;
goto out;
}
cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
ret = -EINVAL;
goto out;
}
if (tunnel->version > 2) {
if (info->attrs[L2TP_ATTR_OFFSET])
cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
if (info->attrs[L2TP_ATTR_DATA_SEQ])
cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
cfg.l2specific_len = 4;
if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
if (info->attrs[L2TP_ATTR_COOKIE]) {
u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
if (len > 8) {
ret = -EINVAL;
goto out;
}
cfg.cookie_len = len;
memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
}
if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
if (len > 8) {
ret = -EINVAL;
goto out;
}
cfg.peer_cookie_len = len;
memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
}
if (info->attrs[L2TP_ATTR_IFNAME])
cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
if (info->attrs[L2TP_ATTR_VLAN_ID])
cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
}
if (info->attrs[L2TP_ATTR_DEBUG])
cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
if (info->attrs[L2TP_ATTR_RECV_SEQ])
cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
if (info->attrs[L2TP_ATTR_SEND_SEQ])
cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
if (info->attrs[L2TP_ATTR_LNS_MODE])
cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
if (info->attrs[L2TP_ATTR_MTU])
cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
if (info->attrs[L2TP_ATTR_MRU])
cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
(l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
ret = -EPROTONOSUPPORT;
goto out;
}
/* Check that pseudowire-specific params are present */
switch (cfg.pw_type) {
case L2TP_PWTYPE_NONE:
break;
case L2TP_PWTYPE_ETH_VLAN:
if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
ret = -EINVAL;
goto out;
}
break;
case L2TP_PWTYPE_ETH:
break;
case L2TP_PWTYPE_PPP:
case L2TP_PWTYPE_PPP_AC:
break;
case L2TP_PWTYPE_IP:
default:
ret = -EPROTONOSUPPORT;
break;
}
ret = -EPROTONOSUPPORT;
if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
session_id, peer_session_id, &cfg);
out:
return ret;
}
static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
{
int ret = 0;
struct l2tp_session *session;
u16 pw_type;
session = l2tp_nl_session_find(info);
if (session == NULL) {
ret = -ENODEV;
goto out;
}
pw_type = session->pwtype;
if (pw_type < __L2TP_PWTYPE_MAX)
if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
out:
return ret;
}
static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
{
int ret = 0;
struct l2tp_session *session;
session = l2tp_nl_session_find(info);
if (session == NULL) {
ret = -ENODEV;
goto out;
}
if (info->attrs[L2TP_ATTR_DEBUG])
session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
if (info->attrs[L2TP_ATTR_DATA_SEQ])
session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
if (info->attrs[L2TP_ATTR_RECV_SEQ])
session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
if (info->attrs[L2TP_ATTR_SEND_SEQ])
session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
if (info->attrs[L2TP_ATTR_LNS_MODE])
session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
if (info->attrs[L2TP_ATTR_MTU])
session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
if (info->attrs[L2TP_ATTR_MRU])
session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
out:
return ret;
}
static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
struct l2tp_session *session)
{
void *hdr;
struct nlattr *nest;
struct l2tp_tunnel *tunnel = session->tunnel;
struct sock *sk = NULL;
struct l2tp_stats stats;
unsigned int start;
sk = tunnel->sock;
hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
if (IS_ERR(hdr))
return PTR_ERR(hdr);
if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
session->peer_session_id) ||
nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
(session->mru &&
nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
goto nla_put_failure;
if ((session->ifname && session->ifname[0] &&
nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
(session->cookie_len &&
nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
&session->cookie[0])) ||
(session->peer_cookie_len &&
nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
&session->peer_cookie[0])) ||
nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
#ifdef CONFIG_XFRM
(((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
#endif
(session->reorder_timeout &&
nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
goto nla_put_failure;
nest = nla_nest_start(skb, L2TP_ATTR_STATS);
if (nest == NULL)
goto nla_put_failure;
do {
start = u64_stats_fetch_begin(&session->stats.syncp);
stats.tx_packets = session->stats.tx_packets;
stats.tx_bytes = session->stats.tx_bytes;
stats.tx_errors = session->stats.tx_errors;
stats.rx_packets = session->stats.rx_packets;
stats.rx_bytes = session->stats.rx_bytes;
stats.rx_errors = session->stats.rx_errors;
stats.rx_seq_discards = session->stats.rx_seq_discards;
stats.rx_oos_packets = session->stats.rx_oos_packets;
} while (u64_stats_fetch_retry(&session->stats.syncp, start));
if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) ||
nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) ||
nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
stats.rx_seq_discards) ||
nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
stats.rx_oos_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors))
goto nla_put_failure;
nla_nest_end(skb, nest);
return genlmsg_end(skb, hdr);
nla_put_failure:
genlmsg_cancel(skb, hdr);
return -1;
}
static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
{
struct l2tp_session *session;
struct sk_buff *msg;
int ret;
session = l2tp_nl_session_find(info);
if (session == NULL) {
ret = -ENODEV;
goto out;
}
msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg) {
ret = -ENOMEM;
goto out;
}
ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq,
0, session);
if (ret < 0)
goto err_out;
return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
err_out:
nlmsg_free(msg);
out:
return ret;
}
static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct l2tp_session *session;
struct l2tp_tunnel *tunnel = NULL;
int ti = cb->args[0];
int si = cb->args[1];
for (;;) {
if (tunnel == NULL) {
tunnel = l2tp_tunnel_find_nth(net, ti);
if (tunnel == NULL)
goto out;
}
session = l2tp_session_find_nth(tunnel, si);
if (session == NULL) {
ti++;
tunnel = NULL;
si = 0;
continue;
}
if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
session) <= 0)
break;
si++;
}
out:
cb->args[0] = ti;
cb->args[1] = si;
return skb->len;
}
static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
[L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
[L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
[L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
[L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
[L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
[L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
[L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
[L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
[L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
[L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
[L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
[L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
[L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
[L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
[L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
[L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
[L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
[L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
[L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
[L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
[L2TP_ATTR_FD] = { .type = NLA_U32, },
[L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
[L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
[L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
[L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
[L2TP_ATTR_MTU] = { .type = NLA_U16, },
[L2TP_ATTR_MRU] = { .type = NLA_U16, },
[L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
[L2TP_ATTR_IP6_SADDR] = {
.type = NLA_BINARY,
.len = sizeof(struct in6_addr),
},
[L2TP_ATTR_IP6_DADDR] = {
.type = NLA_BINARY,
.len = sizeof(struct in6_addr),
},
[L2TP_ATTR_IFNAME] = {
.type = NLA_NUL_STRING,
.len = IFNAMSIZ - 1,
},
[L2TP_ATTR_COOKIE] = {
.type = NLA_BINARY,
.len = 8,
},
[L2TP_ATTR_PEER_COOKIE] = {
.type = NLA_BINARY,
.len = 8,
},
};
static struct genl_ops l2tp_nl_ops[] = {
{
.cmd = L2TP_CMD_NOOP,
.doit = l2tp_nl_cmd_noop,
.policy = l2tp_nl_policy,
/* can be retrieved by unprivileged users */
},
{
.cmd = L2TP_CMD_TUNNEL_CREATE,
.doit = l2tp_nl_cmd_tunnel_create,
.policy = l2tp_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = L2TP_CMD_TUNNEL_DELETE,
.doit = l2tp_nl_cmd_tunnel_delete,
.policy = l2tp_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = L2TP_CMD_TUNNEL_MODIFY,
.doit = l2tp_nl_cmd_tunnel_modify,
.policy = l2tp_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = L2TP_CMD_TUNNEL_GET,
.doit = l2tp_nl_cmd_tunnel_get,
.dumpit = l2tp_nl_cmd_tunnel_dump,
.policy = l2tp_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = L2TP_CMD_SESSION_CREATE,
.doit = l2tp_nl_cmd_session_create,
.policy = l2tp_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = L2TP_CMD_SESSION_DELETE,
.doit = l2tp_nl_cmd_session_delete,
.policy = l2tp_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = L2TP_CMD_SESSION_MODIFY,
.doit = l2tp_nl_cmd_session_modify,
.policy = l2tp_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = L2TP_CMD_SESSION_GET,
.doit = l2tp_nl_cmd_session_get,
.dumpit = l2tp_nl_cmd_session_dump,
.policy = l2tp_nl_policy,
.flags = GENL_ADMIN_PERM,
},
};
int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
{
int ret;
ret = -EINVAL;
if (pw_type >= __L2TP_PWTYPE_MAX)
goto err;
genl_lock();
ret = -EBUSY;
if (l2tp_nl_cmd_ops[pw_type])
goto out;
l2tp_nl_cmd_ops[pw_type] = ops;
ret = 0;
out:
genl_unlock();
err:
return ret;
}
EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
{
if (pw_type < __L2TP_PWTYPE_MAX) {
genl_lock();
l2tp_nl_cmd_ops[pw_type] = NULL;
genl_unlock();
}
}
EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
static int l2tp_nl_init(void)
{
int err;
pr_info("L2TP netlink interface\n");
err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
ARRAY_SIZE(l2tp_nl_ops));
return err;
}
static void l2tp_nl_cleanup(void)
{
genl_unregister_family(&l2tp_nl_family);
}
module_init(l2tp_nl_init);
module_exit(l2tp_nl_cleanup);
MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
MODULE_DESCRIPTION("L2TP netlink");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.0");
MODULE_ALIAS_GENL_FAMILY("l2tp");
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