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ovpn: implement peer add/get/dump/delete via netlink

Browse Source 
This change introduces the netlink command needed to add, delete and
retrieve/dump known peers. Userspace is expected to use these commands
to handle known peer lifecycles.

Signed-off-by: Antonio Quartulli <antonio@openvpn.net>
Link: https://patch.msgid.link/20250415-b4-ovpn-v26-18-577f6097b964@openvpn.net
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Antonio Quartulli 2025-04-15 13:17:35 +02:00 committed by Paolo Abeni
parent f0281c1d37
commit 1d36a36f6d
4 changed files with 738 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

686
drivers/net/ovpn/netlink.c
View File

@ -7,6 +7,7 @@
*/ */
#include <linux/netdevice.h> #include <linux/netdevice.h>
#include <linux/types.h>
#include <net/genetlink.h> #include <net/genetlink.h>
#include <uapi/linux/ovpn.h> #include <uapi/linux/ovpn.h>
@ -15,6 +16,9 @@
#include "main.h" #include "main.h"
#include "netlink.h" #include "netlink.h"
#include "netlink-gen.h" #include "netlink-gen.h"
#include "bind.h"
#include "peer.h"
#include "socket.h"
MODULE_ALIAS_GENL_FAMILY(OVPN_FAMILY_NAME); MODULE_ALIAS_GENL_FAMILY(OVPN_FAMILY_NAME);
@ -89,29 +93,701 @@ void ovpn_nl_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
netdev_put(ovpn->dev, tracker); netdev_put(ovpn->dev, tracker);
} }
static bool ovpn_nl_attr_sockaddr_remote(struct nlattr **attrs,
struct sockaddr_storage *ss)
{
struct sockaddr_in6 *sin6;
struct sockaddr_in *sin;
struct in6_addr *in6;
__be16 port = 0;
__be32 *in;
ss->ss_family = AF_UNSPEC;
if (attrs[OVPN_A_PEER_REMOTE_PORT])
port = nla_get_be16(attrs[OVPN_A_PEER_REMOTE_PORT]);
if (attrs[OVPN_A_PEER_REMOTE_IPV4]) {
ss->ss_family = AF_INET;
in = nla_data(attrs[OVPN_A_PEER_REMOTE_IPV4]);
} else if (attrs[OVPN_A_PEER_REMOTE_IPV6]) {
ss->ss_family = AF_INET6;
in6 = nla_data(attrs[OVPN_A_PEER_REMOTE_IPV6]);
} else {
return false;
}
switch (ss->ss_family) {
case AF_INET6:
/* If this is a regular IPv6 just break and move on,
* otherwise switch to AF_INET and extract the IPv4 accordingly
*/
if (!ipv6_addr_v4mapped(in6)) {
sin6 = (struct sockaddr_in6 *)ss;
sin6->sin6_port = port;
memcpy(&sin6->sin6_addr, in6, sizeof(*in6));
break;
}
/* v4-mapped-v6 address */
ss->ss_family = AF_INET;
in = &in6->s6_addr32[3];
fallthrough;
case AF_INET:
sin = (struct sockaddr_in *)ss;
sin->sin_port = port;
sin->sin_addr.s_addr = *in;
break;
}
return true;
}
static u8 *ovpn_nl_attr_local_ip(struct nlattr **attrs)
{
u8 *addr6;
if (!attrs[OVPN_A_PEER_LOCAL_IPV4] && !attrs[OVPN_A_PEER_LOCAL_IPV6])
return NULL;
if (attrs[OVPN_A_PEER_LOCAL_IPV4])
return nla_data(attrs[OVPN_A_PEER_LOCAL_IPV4]);
addr6 = nla_data(attrs[OVPN_A_PEER_LOCAL_IPV6]);
/* this is an IPv4-mapped IPv6 address, therefore extract the actual
* v4 address from the last 4 bytes
*/
if (ipv6_addr_v4mapped((struct in6_addr *)addr6))
return addr6 + 12;
return addr6;
}
static sa_family_t ovpn_nl_family_get(struct nlattr *addr4,
struct nlattr *addr6)
{
if (addr4)
return AF_INET;
if (addr6) {
if (ipv6_addr_v4mapped((struct in6_addr *)nla_data(addr6)))
return AF_INET;
return AF_INET6;
}
return AF_UNSPEC;
}
static int ovpn_nl_peer_precheck(struct ovpn_priv *ovpn,
struct genl_info *info,
struct nlattr **attrs)
{
sa_family_t local_fam, remote_fam;
if (NL_REQ_ATTR_CHECK(info->extack, info->attrs[OVPN_A_PEER], attrs,
OVPN_A_PEER_ID))
return -EINVAL;
if (attrs[OVPN_A_PEER_REMOTE_IPV4] && attrs[OVPN_A_PEER_REMOTE_IPV6]) {
NL_SET_ERR_MSG_MOD(info->extack,
"cannot specify both remote IPv4 or IPv6 address");
return -EINVAL;
}
if (!attrs[OVPN_A_PEER_REMOTE_IPV4] &&
!attrs[OVPN_A_PEER_REMOTE_IPV6] && attrs[OVPN_A_PEER_REMOTE_PORT]) {
NL_SET_ERR_MSG_MOD(info->extack,
"cannot specify remote port without IP address");
return -EINVAL;
}
if ((attrs[OVPN_A_PEER_REMOTE_IPV4] ||
attrs[OVPN_A_PEER_REMOTE_IPV6]) &&
!attrs[OVPN_A_PEER_REMOTE_PORT]) {
NL_SET_ERR_MSG_MOD(info->extack,
"cannot specify remote IP address without port");
return -EINVAL;
}
if (!attrs[OVPN_A_PEER_REMOTE_IPV4] &&
attrs[OVPN_A_PEER_LOCAL_IPV4]) {
NL_SET_ERR_MSG_MOD(info->extack,
"cannot specify local IPv4 address without remote");
return -EINVAL;
}
if (!attrs[OVPN_A_PEER_REMOTE_IPV6] &&
attrs[OVPN_A_PEER_LOCAL_IPV6]) {
NL_SET_ERR_MSG_MOD(info->extack,
"cannot specify local IPV6 address without remote");
return -EINVAL;
}
/* check that local and remote address families are the same even
* after parsing v4mapped IPv6 addresses.
* (if addresses are not provided, family will be AF_UNSPEC and
* the check is skipped)
*/
local_fam = ovpn_nl_family_get(attrs[OVPN_A_PEER_LOCAL_IPV4],
attrs[OVPN_A_PEER_LOCAL_IPV6]);
remote_fam = ovpn_nl_family_get(attrs[OVPN_A_PEER_REMOTE_IPV4],
attrs[OVPN_A_PEER_REMOTE_IPV6]);
if (local_fam != AF_UNSPEC && remote_fam != AF_UNSPEC &&
local_fam != remote_fam) {
NL_SET_ERR_MSG_MOD(info->extack,
"mismatching local and remote address families");
return -EINVAL;
}
if (remote_fam != AF_INET6 && attrs[OVPN_A_PEER_REMOTE_IPV6_SCOPE_ID]) {
NL_SET_ERR_MSG_MOD(info->extack,
"cannot specify scope id without remote IPv6 address");
return -EINVAL;
}
/* VPN IPs are needed only in MP mode for selecting the right peer */
if (ovpn->mode == OVPN_MODE_P2P && (attrs[OVPN_A_PEER_VPN_IPV4] ||
attrs[OVPN_A_PEER_VPN_IPV6])) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"unexpected VPN IP in P2P mode");
return -EINVAL;
}
if ((attrs[OVPN_A_PEER_KEEPALIVE_INTERVAL] &&
!attrs[OVPN_A_PEER_KEEPALIVE_TIMEOUT]) ||
(!attrs[OVPN_A_PEER_KEEPALIVE_INTERVAL] &&
attrs[OVPN_A_PEER_KEEPALIVE_TIMEOUT])) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"keepalive interval and timeout are required together");
return -EINVAL;
}
return 0;
}
/**
* ovpn_nl_peer_modify - modify the peer attributes according to the incoming msg
* @peer: the peer to modify
* @info: generic netlink info from the user request
* @attrs: the attributes from the user request
*
* Return: a negative error code in case of failure, 0 on success or 1 on
* success and the VPN IPs have been modified (requires rehashing in MP
* mode)
*/
static int ovpn_nl_peer_modify(struct ovpn_peer *peer, struct genl_info *info,
struct nlattr **attrs)
{
struct sockaddr_storage ss = {};
void *local_ip = NULL;
u32 interv, timeout;
bool rehash = false;
int ret;
spin_lock_bh(&peer->lock);
if (ovpn_nl_attr_sockaddr_remote(attrs, &ss)) {
/* we carry the local IP in a generic container.
* ovpn_peer_reset_sockaddr() will properly interpret it
* based on ss.ss_family
*/
local_ip = ovpn_nl_attr_local_ip(attrs);
/* set peer sockaddr */
ret = ovpn_peer_reset_sockaddr(peer, &ss, local_ip);
if (ret < 0) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"cannot set peer sockaddr: %d",
ret);
goto err_unlock;
}
dst_cache_reset(&peer->dst_cache);
}
if (attrs[OVPN_A_PEER_VPN_IPV4]) {
rehash = true;
peer->vpn_addrs.ipv4.s_addr =
nla_get_in_addr(attrs[OVPN_A_PEER_VPN_IPV4]);
}
if (attrs[OVPN_A_PEER_VPN_IPV6]) {
rehash = true;
peer->vpn_addrs.ipv6 =
nla_get_in6_addr(attrs[OVPN_A_PEER_VPN_IPV6]);
}
/* when setting the keepalive, both parameters have to be configured */
if (attrs[OVPN_A_PEER_KEEPALIVE_INTERVAL] &&
attrs[OVPN_A_PEER_KEEPALIVE_TIMEOUT]) {
interv = nla_get_u32(attrs[OVPN_A_PEER_KEEPALIVE_INTERVAL]);
timeout = nla_get_u32(attrs[OVPN_A_PEER_KEEPALIVE_TIMEOUT]);
ovpn_peer_keepalive_set(peer, interv, timeout);
}
netdev_dbg(peer->ovpn->dev,
"modify peer id=%u endpoint=%pIScp VPN-IPv4=%pI4 VPN-IPv6=%pI6c\n",
peer->id, &ss,
&peer->vpn_addrs.ipv4.s_addr, &peer->vpn_addrs.ipv6);
spin_unlock_bh(&peer->lock);
return rehash ? 1 : 0;
err_unlock:
spin_unlock_bh(&peer->lock);
return ret;
}
int ovpn_nl_peer_new_doit(struct sk_buff *skb, struct genl_info *info) int ovpn_nl_peer_new_doit(struct sk_buff *skb, struct genl_info *info)
{ {
return -EOPNOTSUPP; struct nlattr *attrs[OVPN_A_PEER_MAX + 1];
struct ovpn_priv *ovpn = info->user_ptr[0];
struct ovpn_socket *ovpn_sock;
struct socket *sock = NULL;
struct ovpn_peer *peer;
u32 sockfd, peer_id;
int ret;
if (GENL_REQ_ATTR_CHECK(info, OVPN_A_PEER))
return -EINVAL;
ret = nla_parse_nested(attrs, OVPN_A_PEER_MAX, info->attrs[OVPN_A_PEER],
ovpn_peer_nl_policy, info->extack);
if (ret)
return ret;
ret = ovpn_nl_peer_precheck(ovpn, info, attrs);
if (ret < 0)
return ret;
if (NL_REQ_ATTR_CHECK(info->extack, info->attrs[OVPN_A_PEER], attrs,
OVPN_A_PEER_SOCKET))
return -EINVAL;
/* in MP mode VPN IPs are required for selecting the right peer */
if (ovpn->mode == OVPN_MODE_MP && !attrs[OVPN_A_PEER_VPN_IPV4] &&
!attrs[OVPN_A_PEER_VPN_IPV6]) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"VPN IP must be provided in MP mode");
return -EINVAL;
}
peer_id = nla_get_u32(attrs[OVPN_A_PEER_ID]);
peer = ovpn_peer_new(ovpn, peer_id);
if (IS_ERR(peer)) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"cannot create new peer object for peer %u: %ld",
peer_id, PTR_ERR(peer));
return PTR_ERR(peer);
}
/* lookup the fd in the kernel table and extract the socket object */
sockfd = nla_get_u32(attrs[OVPN_A_PEER_SOCKET]);
/* sockfd_lookup() increases sock's refcounter */
sock = sockfd_lookup(sockfd, &ret);
if (!sock) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"cannot lookup peer socket (fd=%u): %d",
sockfd, ret);
ret = -ENOTSOCK;
goto peer_release;
}
/* Only when using UDP as transport protocol the remote endpoint
* can be configured so that ovpn knows where to send packets to.
*/
if (sock->sk->sk_protocol == IPPROTO_UDP &&
!attrs[OVPN_A_PEER_REMOTE_IPV4] &&
!attrs[OVPN_A_PEER_REMOTE_IPV6]) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"missing remote IP address for UDP socket");
sockfd_put(sock);
ret = -EINVAL;
goto peer_release;
}
/* In case of TCP, the socket is connected to the peer and ovpn
* will just send bytes over it, without the need to specify a
* destination.
*/
if (sock->sk->sk_protocol == IPPROTO_TCP &&
(attrs[OVPN_A_PEER_REMOTE_IPV4] ||
attrs[OVPN_A_PEER_REMOTE_IPV6])) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"unexpected remote IP address with TCP socket");
sockfd_put(sock);
ret = -EINVAL;
goto peer_release;
}
ovpn_sock = ovpn_socket_new(sock, peer);
/* at this point we unconditionally drop the reference to the socket:
* - in case of error, the socket has to be dropped
* - if case of success, the socket is configured and let
* userspace own the reference, so that the latter can
* trigger the final close()
*/
sockfd_put(sock);
if (IS_ERR(ovpn_sock)) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"cannot encapsulate socket: %ld",
PTR_ERR(ovpn_sock));
ret = -ENOTSOCK;
goto peer_release;
}
rcu_assign_pointer(peer->sock, ovpn_sock);
ret = ovpn_nl_peer_modify(peer, info, attrs);
if (ret < 0)
goto sock_release;
ret = ovpn_peer_add(ovpn, peer);
if (ret < 0) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"cannot add new peer (id=%u) to hashtable: %d",
peer->id, ret);
goto sock_release;
}
return 0;
sock_release:
ovpn_socket_release(peer);
peer_release:
/* release right away because peer was not yet hashed, thus it is not
* used in any context
*/
ovpn_peer_release(peer);
return ret;
} }
int ovpn_nl_peer_set_doit(struct sk_buff *skb, struct genl_info *info) int ovpn_nl_peer_set_doit(struct sk_buff *skb, struct genl_info *info)
{ {
return -EOPNOTSUPP; struct nlattr *attrs[OVPN_A_PEER_MAX + 1];
struct ovpn_priv *ovpn = info->user_ptr[0];
struct ovpn_socket *sock;
struct ovpn_peer *peer;
u32 peer_id;
int ret;
if (GENL_REQ_ATTR_CHECK(info, OVPN_A_PEER))
return -EINVAL;
ret = nla_parse_nested(attrs, OVPN_A_PEER_MAX, info->attrs[OVPN_A_PEER],
ovpn_peer_nl_policy, info->extack);
if (ret)
return ret;
ret = ovpn_nl_peer_precheck(ovpn, info, attrs);
if (ret < 0)
return ret;
if (attrs[OVPN_A_PEER_SOCKET]) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"socket cannot be modified");
return -EINVAL;
}
peer_id = nla_get_u32(attrs[OVPN_A_PEER_ID]);
peer = ovpn_peer_get_by_id(ovpn, peer_id);
if (!peer) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"cannot find peer with id %u", peer_id);
return -ENOENT;
}
/* when using a TCP socket the remote IP is not expected */
rcu_read_lock();
sock = rcu_dereference(peer->sock);
if (sock && sock->sock->sk->sk_protocol == IPPROTO_TCP &&
(attrs[OVPN_A_PEER_REMOTE_IPV4] ||
attrs[OVPN_A_PEER_REMOTE_IPV6])) {
rcu_read_unlock();
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"unexpected remote IP address with TCP socket");
ovpn_peer_put(peer);
return -EINVAL;
}
rcu_read_unlock();
spin_lock_bh(&ovpn->lock);
ret = ovpn_nl_peer_modify(peer, info, attrs);
if (ret < 0) {
spin_unlock_bh(&ovpn->lock);
ovpn_peer_put(peer);
return ret;
}
/* ret == 1 means that VPN IPv4/6 has been modified and rehashing
* is required
*/
if (ret > 0)
ovpn_peer_hash_vpn_ip(peer);
spin_unlock_bh(&ovpn->lock);
ovpn_peer_put(peer);
return 0;
}
static int ovpn_nl_send_peer(struct sk_buff *skb, const struct genl_info *info,
const struct ovpn_peer *peer, u32 portid, u32 seq,
int flags)
{
const struct ovpn_bind *bind;
struct ovpn_socket *sock;
int ret = -EMSGSIZE;
struct nlattr *attr;
__be16 local_port;
void *hdr;
int id;
hdr = genlmsg_put(skb, portid, seq, &ovpn_nl_family, flags,
OVPN_CMD_PEER_GET);
if (!hdr)
return -ENOBUFS;
attr = nla_nest_start(skb, OVPN_A_PEER);
if (!attr)
goto err;
rcu_read_lock();
sock = rcu_dereference(peer->sock);
if (!sock) {
ret = -EINVAL;
goto err_unlock;
}
if (!net_eq(genl_info_net(info), sock_net(sock->sock->sk))) {
id = peernet2id_alloc(genl_info_net(info),
sock_net(sock->sock->sk),
GFP_ATOMIC);
if (nla_put_s32(skb, OVPN_A_PEER_SOCKET_NETNSID, id))
goto err_unlock;
}
local_port = inet_sk(sock->sock->sk)->inet_sport;
rcu_read_unlock();
if (nla_put_u32(skb, OVPN_A_PEER_ID, peer->id))
goto err;
if (peer->vpn_addrs.ipv4.s_addr != htonl(INADDR_ANY))
if (nla_put_in_addr(skb, OVPN_A_PEER_VPN_IPV4,
peer->vpn_addrs.ipv4.s_addr))
goto err;
if (!ipv6_addr_equal(&peer->vpn_addrs.ipv6, &in6addr_any))
if (nla_put_in6_addr(skb, OVPN_A_PEER_VPN_IPV6,
&peer->vpn_addrs.ipv6))
goto err;
if (nla_put_u32(skb, OVPN_A_PEER_KEEPALIVE_INTERVAL,
peer->keepalive_interval) ||
nla_put_u32(skb, OVPN_A_PEER_KEEPALIVE_TIMEOUT,
peer->keepalive_timeout))
goto err;
rcu_read_lock();
bind = rcu_dereference(peer->bind);
if (bind) {
if (bind->remote.in4.sin_family == AF_INET) {
if (nla_put_in_addr(skb, OVPN_A_PEER_REMOTE_IPV4,
bind->remote.in4.sin_addr.s_addr) ||
nla_put_net16(skb, OVPN_A_PEER_REMOTE_PORT,
bind->remote.in4.sin_port) ||
nla_put_in_addr(skb, OVPN_A_PEER_LOCAL_IPV4,
bind->local.ipv4.s_addr))
goto err_unlock;
} else if (bind->remote.in4.sin_family == AF_INET6) {
if (nla_put_in6_addr(skb, OVPN_A_PEER_REMOTE_IPV6,
&bind->remote.in6.sin6_addr) ||
nla_put_u32(skb, OVPN_A_PEER_REMOTE_IPV6_SCOPE_ID,
bind->remote.in6.sin6_scope_id) ||
nla_put_net16(skb, OVPN_A_PEER_REMOTE_PORT,
bind->remote.in6.sin6_port) ||
nla_put_in6_addr(skb, OVPN_A_PEER_LOCAL_IPV6,
&bind->local.ipv6))
goto err_unlock;
}
}
rcu_read_unlock();
if (nla_put_net16(skb, OVPN_A_PEER_LOCAL_PORT, local_port) ||
/* VPN RX stats */
nla_put_uint(skb, OVPN_A_PEER_VPN_RX_BYTES,
atomic64_read(&peer->vpn_stats.rx.bytes)) ||
nla_put_uint(skb, OVPN_A_PEER_VPN_RX_PACKETS,
atomic64_read(&peer->vpn_stats.rx.packets)) ||
/* VPN TX stats */
nla_put_uint(skb, OVPN_A_PEER_VPN_TX_BYTES,
atomic64_read(&peer->vpn_stats.tx.bytes)) ||
nla_put_uint(skb, OVPN_A_PEER_VPN_TX_PACKETS,
atomic64_read(&peer->vpn_stats.tx.packets)) ||
/* link RX stats */
nla_put_uint(skb, OVPN_A_PEER_LINK_RX_BYTES,
atomic64_read(&peer->link_stats.rx.bytes)) ||
nla_put_uint(skb, OVPN_A_PEER_LINK_RX_PACKETS,
atomic64_read(&peer->link_stats.rx.packets)) ||
/* link TX stats */
nla_put_uint(skb, OVPN_A_PEER_LINK_TX_BYTES,
atomic64_read(&peer->link_stats.tx.bytes)) ||
nla_put_uint(skb, OVPN_A_PEER_LINK_TX_PACKETS,
atomic64_read(&peer->link_stats.tx.packets)))
goto err;
nla_nest_end(skb, attr);
genlmsg_end(skb, hdr);
return 0;
err_unlock:
rcu_read_unlock();
err:
genlmsg_cancel(skb, hdr);
return ret;
} }
int ovpn_nl_peer_get_doit(struct sk_buff *skb, struct genl_info *info) int ovpn_nl_peer_get_doit(struct sk_buff *skb, struct genl_info *info)
{ {
return -EOPNOTSUPP; struct nlattr *attrs[OVPN_A_PEER_MAX + 1];
struct ovpn_priv *ovpn = info->user_ptr[0];
struct ovpn_peer *peer;
struct sk_buff *msg;
u32 peer_id;
int ret;
if (GENL_REQ_ATTR_CHECK(info, OVPN_A_PEER))
return -EINVAL;
ret = nla_parse_nested(attrs, OVPN_A_PEER_MAX, info->attrs[OVPN_A_PEER],
ovpn_peer_nl_policy, info->extack);
if (ret)
return ret;
if (NL_REQ_ATTR_CHECK(info->extack, info->attrs[OVPN_A_PEER], attrs,
OVPN_A_PEER_ID))
return -EINVAL;
peer_id = nla_get_u32(attrs[OVPN_A_PEER_ID]);
peer = ovpn_peer_get_by_id(ovpn, peer_id);
if (!peer) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"cannot find peer with id %u", peer_id);
return -ENOENT;
}
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg) {
ret = -ENOMEM;
goto err;
}
ret = ovpn_nl_send_peer(msg, info, peer, info->snd_portid,
info->snd_seq, 0);
if (ret < 0) {
nlmsg_free(msg);
goto err;
}
ret = genlmsg_reply(msg, info);
err:
ovpn_peer_put(peer);
return ret;
} }
int ovpn_nl_peer_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) int ovpn_nl_peer_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{ {
return -EOPNOTSUPP; const struct genl_info *info = genl_info_dump(cb);
int bkt, last_idx = cb->args[1], dumped = 0;
netdevice_tracker tracker;
struct ovpn_priv *ovpn;
struct ovpn_peer *peer;
ovpn = ovpn_get_dev_from_attrs(sock_net(cb->skb->sk), info, &tracker);
if (IS_ERR(ovpn))
return PTR_ERR(ovpn);
if (ovpn->mode == OVPN_MODE_P2P) {
/* if we already dumped a peer it means we are done */
if (last_idx)
goto out;
rcu_read_lock();
peer = rcu_dereference(ovpn->peer);
if (peer) {
if (ovpn_nl_send_peer(skb, info, peer,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI) == 0)
dumped++;
}
rcu_read_unlock();
} else {
rcu_read_lock();
hash_for_each_rcu(ovpn->peers->by_id, bkt, peer,
hash_entry_id) {
/* skip already dumped peers that were dumped by
* previous invocations
*/
if (last_idx > 0) {
last_idx--;
continue;
}
if (ovpn_nl_send_peer(skb, info, peer,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI) < 0)
break;
/* count peers being dumped during this invocation */
dumped++;
}
rcu_read_unlock();
}
out:
netdev_put(ovpn->dev, &tracker);
/* sum up peers dumped in this message, so that at the next invocation
* we can continue from where we left
*/
cb->args[1] += dumped;
return skb->len;
} }
int ovpn_nl_peer_del_doit(struct sk_buff *skb, struct genl_info *info) int ovpn_nl_peer_del_doit(struct sk_buff *skb, struct genl_info *info)
{ {
return -EOPNOTSUPP; struct nlattr *attrs[OVPN_A_PEER_MAX + 1];
struct ovpn_priv *ovpn = info->user_ptr[0];
struct ovpn_peer *peer;
u32 peer_id;
int ret;
if (GENL_REQ_ATTR_CHECK(info, OVPN_A_PEER))
return -EINVAL;
ret = nla_parse_nested(attrs, OVPN_A_PEER_MAX, info->attrs[OVPN_A_PEER],
ovpn_peer_nl_policy, info->extack);
if (ret)
return ret;
if (NL_REQ_ATTR_CHECK(info->extack, info->attrs[OVPN_A_PEER], attrs,
OVPN_A_PEER_ID))
return -EINVAL;
peer_id = nla_get_u32(attrs[OVPN_A_PEER_ID]);
peer = ovpn_peer_get_by_id(ovpn, peer_id);
if (!peer) {
NL_SET_ERR_MSG_FMT_MOD(info->extack,
"cannot find peer with id %u", peer_id);
return -ENOENT;
}
netdev_dbg(ovpn->dev, "del peer %u\n", peer->id);
ret = ovpn_peer_del(peer, OVPN_DEL_PEER_REASON_USERSPACE);
ovpn_peer_put(peer);
return ret;
} }
int ovpn_nl_key_new_doit(struct sk_buff *skb, struct genl_info *info) int ovpn_nl_key_new_doit(struct sk_buff *skb, struct genl_info *info)

79
drivers/net/ovpn/peer.c
View File

@ -135,9 +135,9 @@ struct ovpn_peer *ovpn_peer_new(struct ovpn_priv *ovpn, u32 id)
* *
* Return: 0 on success or a negative error code otherwise * Return: 0 on success or a negative error code otherwise
*/ */
static int ovpn_peer_reset_sockaddr(struct ovpn_peer *peer, int ovpn_peer_reset_sockaddr(struct ovpn_peer *peer,
const struct sockaddr_storage *ss, const struct sockaddr_storage *ss,
const void *local_ip) const void *local_ip)
{ {
struct ovpn_bind *bind; struct ovpn_bind *bind;
size_t ip_len; size_t ip_len;
@ -149,19 +149,21 @@ static int ovpn_peer_reset_sockaddr(struct ovpn_peer *peer,
if (IS_ERR(bind)) if (IS_ERR(bind))
return PTR_ERR(bind); return PTR_ERR(bind);
if (ss->ss_family == AF_INET) { if (local_ip) {
ip_len = sizeof(struct in_addr); if (ss->ss_family == AF_INET) {
} else if (ss->ss_family == AF_INET6) { ip_len = sizeof(struct in_addr);
ip_len = sizeof(struct in6_addr); } else if (ss->ss_family == AF_INET6) {
} else { ip_len = sizeof(struct in6_addr);
net_dbg_ratelimited("%s: invalid family %u for remote endpoint for peer %u\n", } else {
netdev_name(peer->ovpn->dev), net_dbg_ratelimited("%s: invalid family %u for remote endpoint for peer %u\n",
ss->ss_family, peer->id); netdev_name(peer->ovpn->dev),
kfree(bind); ss->ss_family, peer->id);
return -EINVAL; kfree(bind);
} return -EINVAL;
}
memcpy(&bind->local, local_ip, ip_len); memcpy(&bind->local, local_ip, ip_len);
}
/* set binding */ /* set binding */
ovpn_bind_reset(peer, bind); ovpn_bind_reset(peer, bind);
@ -346,7 +348,7 @@ static void ovpn_peer_release_rcu(struct rcu_head *head)
* ovpn_peer_release - release peer private members * ovpn_peer_release - release peer private members
* @peer: the peer to release * @peer: the peer to release
*/ */
static void ovpn_peer_release(struct ovpn_peer *peer) void ovpn_peer_release(struct ovpn_peer *peer)
{ {
ovpn_crypto_state_release(&peer->crypto); ovpn_crypto_state_release(&peer->crypto);
spin_lock_bh(&peer->lock); spin_lock_bh(&peer->lock);
@ -887,6 +889,37 @@ bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, struct sk_buff *skb,
return match; return match;
} }
void ovpn_peer_hash_vpn_ip(struct ovpn_peer *peer)
{
struct hlist_nulls_head *nhead;
lockdep_assert_held(&peer->ovpn->lock);
/* rehashing makes sense only in multipeer mode */
if (peer->ovpn->mode != OVPN_MODE_MP)
return;
if (peer->vpn_addrs.ipv4.s_addr != htonl(INADDR_ANY)) {
/* remove potential old hashing */
hlist_nulls_del_init_rcu(&peer->hash_entry_addr4);
nhead = ovpn_get_hash_head(peer->ovpn->peers->by_vpn_addr4,
&peer->vpn_addrs.ipv4,
sizeof(peer->vpn_addrs.ipv4));
hlist_nulls_add_head_rcu(&peer->hash_entry_addr4, nhead);
}
if (!ipv6_addr_any(&peer->vpn_addrs.ipv6)) {
/* remove potential old hashing */
hlist_nulls_del_init_rcu(&peer->hash_entry_addr6);
nhead = ovpn_get_hash_head(peer->ovpn->peers->by_vpn_addr6,
&peer->vpn_addrs.ipv6,
sizeof(peer->vpn_addrs.ipv6));
hlist_nulls_add_head_rcu(&peer->hash_entry_addr6, nhead);
}
}
/** /**
* ovpn_peer_add_mp - add peer to related tables in a MP instance * ovpn_peer_add_mp - add peer to related tables in a MP instance
* @ovpn: the instance to add the peer to * @ovpn: the instance to add the peer to
@ -948,19 +981,7 @@ static int ovpn_peer_add_mp(struct ovpn_priv *ovpn, struct ovpn_peer *peer)
ovpn_get_hash_head(ovpn->peers->by_id, &peer->id, ovpn_get_hash_head(ovpn->peers->by_id, &peer->id,
sizeof(peer->id))); sizeof(peer->id)));
if (peer->vpn_addrs.ipv4.s_addr != htonl(INADDR_ANY)) { ovpn_peer_hash_vpn_ip(peer);
nhead = ovpn_get_hash_head(ovpn->peers->by_vpn_addr4,
&peer->vpn_addrs.ipv4,
sizeof(peer->vpn_addrs.ipv4));
hlist_nulls_add_head_rcu(&peer->hash_entry_addr4, nhead);
}
if (!ipv6_addr_any(&peer->vpn_addrs.ipv6)) {
nhead = ovpn_get_hash_head(ovpn->peers->by_vpn_addr6,
&peer->vpn_addrs.ipv6,
sizeof(peer->vpn_addrs.ipv6));
hlist_nulls_add_head_rcu(&peer->hash_entry_addr6, nhead);
}
out: out:
spin_unlock_bh(&ovpn->lock); spin_unlock_bh(&ovpn->lock);
return ret; return ret;

5
drivers/net/ovpn/peer.h
View File

@ -125,6 +125,7 @@ static inline bool ovpn_peer_hold(struct ovpn_peer *peer)
return kref_get_unless_zero(&peer->refcount); return kref_get_unless_zero(&peer->refcount);
} }
void ovpn_peer_release(struct ovpn_peer *peer);
void ovpn_peer_release_kref(struct kref *kref); void ovpn_peer_release_kref(struct kref *kref);
/** /**
@ -147,6 +148,7 @@ struct ovpn_peer *ovpn_peer_get_by_transp_addr(struct ovpn_priv *ovpn,
struct ovpn_peer *ovpn_peer_get_by_id(struct ovpn_priv *ovpn, u32 peer_id); struct ovpn_peer *ovpn_peer_get_by_id(struct ovpn_priv *ovpn, u32 peer_id);
struct ovpn_peer *ovpn_peer_get_by_dst(struct ovpn_priv *ovpn, struct ovpn_peer *ovpn_peer_get_by_dst(struct ovpn_priv *ovpn,
struct sk_buff *skb); struct sk_buff *skb);
void ovpn_peer_hash_vpn_ip(struct ovpn_peer *peer);
bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, struct sk_buff *skb, bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, struct sk_buff *skb,
struct ovpn_peer *peer); struct ovpn_peer *peer);
@ -154,5 +156,8 @@ void ovpn_peer_keepalive_set(struct ovpn_peer *peer, u32 interval, u32 timeout);
void ovpn_peer_keepalive_work(struct work_struct *work); void ovpn_peer_keepalive_work(struct work_struct *work);
void ovpn_peer_endpoints_update(struct ovpn_peer *peer, struct sk_buff *skb); void ovpn_peer_endpoints_update(struct ovpn_peer *peer, struct sk_buff *skb);
int ovpn_peer_reset_sockaddr(struct ovpn_peer *peer,
const struct sockaddr_storage *ss,
const void *local_ip);
#endif /* _NET_OVPN_OVPNPEER_H_ */ #endif /* _NET_OVPN_OVPNPEER_H_ */

4
drivers/net/ovpn/socket.c
View File

@ -49,8 +49,8 @@ static bool ovpn_socket_put(struct ovpn_peer *peer, struct ovpn_socket *sock)
* ovpn_socket_release - release resources owned by socket user * ovpn_socket_release - release resources owned by socket user
* @peer: peer whose socket should be released * @peer: peer whose socket should be released
* *
* This function should be invoked when the user is shutting * This function should be invoked when the peer is being removed
* down and wants to drop its link to the socket. * and wants to drop its link to the socket.
* *
* In case of UDP, the detach routine will drop a reference to the * In case of UDP, the detach routine will drop a reference to the
* ovpn netdev, pointed by the ovpn_socket. * ovpn netdev, pointed by the ovpn_socket.