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![Bo YU](/assets/img/avatar_default.png)
Normal there should be checked for nla_put_in6_addr like other
usage in net.
Detected by CoverityScan, CID# 1461639
Fixes: 01cacb00b3
("mptcp: add netlink-based PM")
Signed-off-by: Bo YU <tsu.yubo@gmail.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
861 lines
21 KiB
C
861 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Multipath TCP
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*
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* Copyright (c) 2020, Red Hat, Inc.
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*/
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#define pr_fmt(fmt) "MPTCP: " fmt
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#include <linux/inet.h>
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#include <linux/kernel.h>
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#include <net/tcp.h>
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#include <net/netns/generic.h>
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#include <net/mptcp.h>
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#include <net/genetlink.h>
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#include <uapi/linux/mptcp.h>
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#include "protocol.h"
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/* forward declaration */
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static struct genl_family mptcp_genl_family;
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static int pm_nl_pernet_id;
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struct mptcp_pm_addr_entry {
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struct list_head list;
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unsigned int flags;
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int ifindex;
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struct mptcp_addr_info addr;
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struct rcu_head rcu;
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};
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struct pm_nl_pernet {
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/* protects pernet updates */
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spinlock_t lock;
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struct list_head local_addr_list;
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unsigned int addrs;
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unsigned int add_addr_signal_max;
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unsigned int add_addr_accept_max;
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unsigned int local_addr_max;
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unsigned int subflows_max;
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unsigned int next_id;
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};
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#define MPTCP_PM_ADDR_MAX 8
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static bool addresses_equal(const struct mptcp_addr_info *a,
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struct mptcp_addr_info *b, bool use_port)
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{
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bool addr_equals = false;
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if (a->family != b->family)
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return false;
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if (a->family == AF_INET)
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addr_equals = a->addr.s_addr == b->addr.s_addr;
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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else
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addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6);
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#endif
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if (!addr_equals)
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return false;
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if (!use_port)
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return true;
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return a->port == b->port;
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}
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static void local_address(const struct sock_common *skc,
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struct mptcp_addr_info *addr)
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{
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addr->port = 0;
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addr->family = skc->skc_family;
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if (addr->family == AF_INET)
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addr->addr.s_addr = skc->skc_rcv_saddr;
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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else if (addr->family == AF_INET6)
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addr->addr6 = skc->skc_v6_rcv_saddr;
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#endif
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}
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static void remote_address(const struct sock_common *skc,
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struct mptcp_addr_info *addr)
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{
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addr->family = skc->skc_family;
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addr->port = skc->skc_dport;
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if (addr->family == AF_INET)
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addr->addr.s_addr = skc->skc_daddr;
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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else if (addr->family == AF_INET6)
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addr->addr6 = skc->skc_v6_daddr;
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#endif
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}
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static bool lookup_subflow_by_saddr(const struct list_head *list,
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struct mptcp_addr_info *saddr)
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{
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struct mptcp_subflow_context *subflow;
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struct mptcp_addr_info cur;
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struct sock_common *skc;
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list_for_each_entry(subflow, list, node) {
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skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow);
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local_address(skc, &cur);
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if (addresses_equal(&cur, saddr, false))
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return true;
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}
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return false;
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}
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static struct mptcp_pm_addr_entry *
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select_local_address(const struct pm_nl_pernet *pernet,
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struct mptcp_sock *msk)
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{
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struct mptcp_pm_addr_entry *entry, *ret = NULL;
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rcu_read_lock();
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spin_lock_bh(&msk->join_list_lock);
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list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
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if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW))
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continue;
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/* avoid any address already in use by subflows and
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* pending join
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*/
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if (entry->addr.family == ((struct sock *)msk)->sk_family &&
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!lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) &&
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!lookup_subflow_by_saddr(&msk->join_list, &entry->addr)) {
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ret = entry;
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break;
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}
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}
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spin_unlock_bh(&msk->join_list_lock);
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rcu_read_unlock();
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return ret;
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}
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static struct mptcp_pm_addr_entry *
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select_signal_address(struct pm_nl_pernet *pernet, unsigned int pos)
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{
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struct mptcp_pm_addr_entry *entry, *ret = NULL;
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int i = 0;
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rcu_read_lock();
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/* do not keep any additional per socket state, just signal
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* the address list in order.
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* Note: removal from the local address list during the msk life-cycle
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* can lead to additional addresses not being announced.
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*/
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list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
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if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL))
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continue;
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if (i++ == pos) {
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ret = entry;
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break;
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}
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}
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rcu_read_unlock();
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return ret;
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}
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static void check_work_pending(struct mptcp_sock *msk)
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{
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if (msk->pm.add_addr_signaled == msk->pm.add_addr_signal_max &&
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(msk->pm.local_addr_used == msk->pm.local_addr_max ||
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msk->pm.subflows == msk->pm.subflows_max))
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WRITE_ONCE(msk->pm.work_pending, false);
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}
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static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
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{
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struct sock *sk = (struct sock *)msk;
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struct mptcp_pm_addr_entry *local;
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struct mptcp_addr_info remote;
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struct pm_nl_pernet *pernet;
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pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id);
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pr_debug("local %d:%d signal %d:%d subflows %d:%d\n",
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msk->pm.local_addr_used, msk->pm.local_addr_max,
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msk->pm.add_addr_signaled, msk->pm.add_addr_signal_max,
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msk->pm.subflows, msk->pm.subflows_max);
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/* check first for announce */
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if (msk->pm.add_addr_signaled < msk->pm.add_addr_signal_max) {
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local = select_signal_address(pernet,
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msk->pm.add_addr_signaled);
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if (local) {
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msk->pm.add_addr_signaled++;
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mptcp_pm_announce_addr(msk, &local->addr);
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} else {
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/* pick failed, avoid fourther attempts later */
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msk->pm.local_addr_used = msk->pm.add_addr_signal_max;
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}
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check_work_pending(msk);
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}
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/* check if should create a new subflow */
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if (msk->pm.local_addr_used < msk->pm.local_addr_max &&
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msk->pm.subflows < msk->pm.subflows_max) {
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remote_address((struct sock_common *)sk, &remote);
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local = select_local_address(pernet, msk);
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if (local) {
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msk->pm.local_addr_used++;
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msk->pm.subflows++;
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check_work_pending(msk);
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spin_unlock_bh(&msk->pm.lock);
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__mptcp_subflow_connect(sk, local->ifindex,
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&local->addr, &remote);
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spin_lock_bh(&msk->pm.lock);
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return;
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}
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/* lookup failed, avoid fourther attempts later */
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msk->pm.local_addr_used = msk->pm.local_addr_max;
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check_work_pending(msk);
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}
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}
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void mptcp_pm_nl_fully_established(struct mptcp_sock *msk)
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{
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mptcp_pm_create_subflow_or_signal_addr(msk);
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}
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void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk)
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{
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mptcp_pm_create_subflow_or_signal_addr(msk);
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}
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void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
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{
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struct sock *sk = (struct sock *)msk;
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struct mptcp_addr_info remote;
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struct mptcp_addr_info local;
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pr_debug("accepted %d:%d remote family %d",
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msk->pm.add_addr_accepted, msk->pm.add_addr_accept_max,
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msk->pm.remote.family);
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msk->pm.add_addr_accepted++;
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msk->pm.subflows++;
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if (msk->pm.add_addr_accepted >= msk->pm.add_addr_accept_max ||
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msk->pm.subflows >= msk->pm.subflows_max)
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WRITE_ONCE(msk->pm.accept_addr, false);
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/* connect to the specified remote address, using whatever
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* local address the routing configuration will pick.
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*/
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remote = msk->pm.remote;
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if (!remote.port)
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remote.port = sk->sk_dport;
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memset(&local, 0, sizeof(local));
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local.family = remote.family;
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spin_unlock_bh(&msk->pm.lock);
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__mptcp_subflow_connect((struct sock *)msk, 0, &local, &remote);
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spin_lock_bh(&msk->pm.lock);
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}
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static bool address_use_port(struct mptcp_pm_addr_entry *entry)
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{
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return (entry->flags &
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(MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) ==
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MPTCP_PM_ADDR_FLAG_SIGNAL;
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}
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static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet,
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struct mptcp_pm_addr_entry *entry)
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{
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struct mptcp_pm_addr_entry *cur;
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int ret = -EINVAL;
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spin_lock_bh(&pernet->lock);
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/* to keep the code simple, don't do IDR-like allocation for address ID,
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* just bail when we exceed limits
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*/
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if (pernet->next_id > 255)
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goto out;
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if (pernet->addrs >= MPTCP_PM_ADDR_MAX)
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goto out;
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/* do not insert duplicate address, differentiate on port only
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* singled addresses
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*/
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list_for_each_entry(cur, &pernet->local_addr_list, list) {
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if (addresses_equal(&cur->addr, &entry->addr,
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address_use_port(entry) &&
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address_use_port(cur)))
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goto out;
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}
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if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)
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pernet->add_addr_signal_max++;
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if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)
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pernet->local_addr_max++;
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entry->addr.id = pernet->next_id++;
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pernet->addrs++;
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list_add_tail_rcu(&entry->list, &pernet->local_addr_list);
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ret = entry->addr.id;
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out:
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spin_unlock_bh(&pernet->lock);
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return ret;
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}
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int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
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{
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struct mptcp_pm_addr_entry *entry;
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struct mptcp_addr_info skc_local;
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struct mptcp_addr_info msk_local;
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struct pm_nl_pernet *pernet;
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int ret = -1;
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if (WARN_ON_ONCE(!msk))
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return -1;
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/* The 0 ID mapping is defined by the first subflow, copied into the msk
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* addr
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*/
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local_address((struct sock_common *)msk, &msk_local);
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local_address((struct sock_common *)msk, &skc_local);
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if (addresses_equal(&msk_local, &skc_local, false))
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return 0;
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pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id);
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rcu_read_lock();
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list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
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if (addresses_equal(&entry->addr, &skc_local, false)) {
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ret = entry->addr.id;
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break;
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}
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}
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rcu_read_unlock();
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if (ret >= 0)
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return ret;
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/* address not found, add to local list */
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entry = kmalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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entry->flags = 0;
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entry->addr = skc_local;
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ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
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if (ret < 0)
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kfree(entry);
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return ret;
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}
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void mptcp_pm_nl_data_init(struct mptcp_sock *msk)
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{
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struct mptcp_pm_data *pm = &msk->pm;
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struct pm_nl_pernet *pernet;
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bool subflows;
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pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id);
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pm->add_addr_signal_max = READ_ONCE(pernet->add_addr_signal_max);
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pm->add_addr_accept_max = READ_ONCE(pernet->add_addr_accept_max);
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pm->local_addr_max = READ_ONCE(pernet->local_addr_max);
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pm->subflows_max = READ_ONCE(pernet->subflows_max);
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subflows = !!pm->subflows_max;
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WRITE_ONCE(pm->work_pending, (!!pm->local_addr_max && subflows) ||
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!!pm->add_addr_signal_max);
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WRITE_ONCE(pm->accept_addr, !!pm->add_addr_accept_max && subflows);
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WRITE_ONCE(pm->accept_subflow, subflows);
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}
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#define MPTCP_PM_CMD_GRP_OFFSET 0
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static const struct genl_multicast_group mptcp_pm_mcgrps[] = {
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[MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, },
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};
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static const struct nla_policy
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mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = {
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[MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, },
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[MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, },
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[MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, },
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[MPTCP_PM_ADDR_ATTR_ADDR6] = { .type = NLA_EXACT_LEN,
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.len = sizeof(struct in6_addr), },
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[MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 },
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[MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 },
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[MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 },
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};
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static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = {
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[MPTCP_PM_ATTR_ADDR] =
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NLA_POLICY_NESTED(mptcp_pm_addr_policy),
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[MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, },
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[MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, },
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};
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static int mptcp_pm_family_to_addr(int family)
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{
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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if (family == AF_INET6)
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return MPTCP_PM_ADDR_ATTR_ADDR6;
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#endif
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return MPTCP_PM_ADDR_ATTR_ADDR4;
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}
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static int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
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bool require_family,
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struct mptcp_pm_addr_entry *entry)
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{
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struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1];
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int err, addr_addr;
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if (!attr) {
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GENL_SET_ERR_MSG(info, "missing address info");
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return -EINVAL;
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}
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/* no validation needed - was already done via nested policy */
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err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr,
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mptcp_pm_addr_policy, info->extack);
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if (err)
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return err;
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memset(entry, 0, sizeof(*entry));
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if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) {
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if (!require_family)
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goto skip_family;
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NL_SET_ERR_MSG_ATTR(info->extack, attr,
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"missing family");
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return -EINVAL;
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}
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entry->addr.family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]);
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if (entry->addr.family != AF_INET
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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&& entry->addr.family != AF_INET6
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#endif
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) {
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NL_SET_ERR_MSG_ATTR(info->extack, attr,
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"unknown address family");
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return -EINVAL;
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}
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addr_addr = mptcp_pm_family_to_addr(entry->addr.family);
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if (!tb[addr_addr]) {
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NL_SET_ERR_MSG_ATTR(info->extack, attr,
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"missing address data");
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return -EINVAL;
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}
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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if (entry->addr.family == AF_INET6)
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entry->addr.addr6 = nla_get_in6_addr(tb[addr_addr]);
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else
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#endif
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entry->addr.addr.s_addr = nla_get_in_addr(tb[addr_addr]);
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skip_family:
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if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX])
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entry->ifindex = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]);
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if (tb[MPTCP_PM_ADDR_ATTR_ID])
|
|
entry->addr.id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]);
|
|
|
|
if (tb[MPTCP_PM_ADDR_ATTR_FLAGS])
|
|
entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info)
|
|
{
|
|
return net_generic(genl_info_net(info), pm_nl_pernet_id);
|
|
}
|
|
|
|
static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
|
|
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
|
|
struct mptcp_pm_addr_entry addr, *entry;
|
|
int ret;
|
|
|
|
ret = mptcp_pm_parse_addr(attr, info, true, &addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
|
|
if (!entry) {
|
|
GENL_SET_ERR_MSG(info, "can't allocate addr");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*entry = addr;
|
|
ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
|
|
if (ret < 0) {
|
|
GENL_SET_ERR_MSG(info, "too many addresses or duplicate one");
|
|
kfree(entry);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct mptcp_pm_addr_entry *
|
|
__lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id)
|
|
{
|
|
struct mptcp_pm_addr_entry *entry;
|
|
|
|
list_for_each_entry(entry, &pernet->local_addr_list, list) {
|
|
if (entry->addr.id == id)
|
|
return entry;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
|
|
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
|
|
struct mptcp_pm_addr_entry addr, *entry;
|
|
int ret;
|
|
|
|
ret = mptcp_pm_parse_addr(attr, info, false, &addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
entry = __lookup_addr_by_id(pernet, addr.addr.id);
|
|
if (!entry) {
|
|
GENL_SET_ERR_MSG(info, "address not found");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)
|
|
pernet->add_addr_signal_max--;
|
|
if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)
|
|
pernet->local_addr_max--;
|
|
|
|
pernet->addrs--;
|
|
list_del_rcu(&entry->list);
|
|
kfree_rcu(entry, rcu);
|
|
out:
|
|
spin_unlock_bh(&pernet->lock);
|
|
return ret;
|
|
}
|
|
|
|
static void __flush_addrs(struct pm_nl_pernet *pernet)
|
|
{
|
|
while (!list_empty(&pernet->local_addr_list)) {
|
|
struct mptcp_pm_addr_entry *cur;
|
|
|
|
cur = list_entry(pernet->local_addr_list.next,
|
|
struct mptcp_pm_addr_entry, list);
|
|
list_del_rcu(&cur->list);
|
|
kfree_rcu(cur, rcu);
|
|
}
|
|
}
|
|
|
|
static void __reset_counters(struct pm_nl_pernet *pernet)
|
|
{
|
|
pernet->add_addr_signal_max = 0;
|
|
pernet->add_addr_accept_max = 0;
|
|
pernet->local_addr_max = 0;
|
|
pernet->addrs = 0;
|
|
}
|
|
|
|
static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
__flush_addrs(pernet);
|
|
__reset_counters(pernet);
|
|
spin_unlock_bh(&pernet->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int mptcp_nl_fill_addr(struct sk_buff *skb,
|
|
struct mptcp_pm_addr_entry *entry)
|
|
{
|
|
struct mptcp_addr_info *addr = &entry->addr;
|
|
struct nlattr *attr;
|
|
|
|
attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR);
|
|
if (!attr)
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family))
|
|
goto nla_put_failure;
|
|
if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id))
|
|
goto nla_put_failure;
|
|
if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags))
|
|
goto nla_put_failure;
|
|
if (entry->ifindex &&
|
|
nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex))
|
|
goto nla_put_failure;
|
|
|
|
if (addr->family == AF_INET &&
|
|
nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4,
|
|
addr->addr.s_addr))
|
|
goto nla_put_failure;
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
else if (addr->family == AF_INET6 &&
|
|
nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6))
|
|
goto nla_put_failure;
|
|
#endif
|
|
nla_nest_end(skb, attr);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, attr);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
|
|
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
|
|
struct mptcp_pm_addr_entry addr, *entry;
|
|
struct sk_buff *msg;
|
|
void *reply;
|
|
int ret;
|
|
|
|
ret = mptcp_pm_parse_addr(attr, info, false, &addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0,
|
|
info->genlhdr->cmd);
|
|
if (!reply) {
|
|
GENL_SET_ERR_MSG(info, "not enough space in Netlink message");
|
|
ret = -EMSGSIZE;
|
|
goto fail;
|
|
}
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
entry = __lookup_addr_by_id(pernet, addr.addr.id);
|
|
if (!entry) {
|
|
GENL_SET_ERR_MSG(info, "address not found");
|
|
ret = -EINVAL;
|
|
goto unlock_fail;
|
|
}
|
|
|
|
ret = mptcp_nl_fill_addr(msg, entry);
|
|
if (ret)
|
|
goto unlock_fail;
|
|
|
|
genlmsg_end(msg, reply);
|
|
ret = genlmsg_reply(msg, info);
|
|
spin_unlock_bh(&pernet->lock);
|
|
return ret;
|
|
|
|
unlock_fail:
|
|
spin_unlock_bh(&pernet->lock);
|
|
|
|
fail:
|
|
nlmsg_free(msg);
|
|
return ret;
|
|
}
|
|
|
|
static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg,
|
|
struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(msg->sk);
|
|
struct mptcp_pm_addr_entry *entry;
|
|
struct pm_nl_pernet *pernet;
|
|
int id = cb->args[0];
|
|
void *hdr;
|
|
|
|
pernet = net_generic(net, pm_nl_pernet_id);
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
list_for_each_entry(entry, &pernet->local_addr_list, list) {
|
|
if (entry->addr.id <= id)
|
|
continue;
|
|
|
|
hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, &mptcp_genl_family,
|
|
NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR);
|
|
if (!hdr)
|
|
break;
|
|
|
|
if (mptcp_nl_fill_addr(msg, entry) < 0) {
|
|
genlmsg_cancel(msg, hdr);
|
|
break;
|
|
}
|
|
|
|
id = entry->addr.id;
|
|
genlmsg_end(msg, hdr);
|
|
}
|
|
spin_unlock_bh(&pernet->lock);
|
|
|
|
cb->args[0] = id;
|
|
return msg->len;
|
|
}
|
|
|
|
static int parse_limit(struct genl_info *info, int id, unsigned int *limit)
|
|
{
|
|
struct nlattr *attr = info->attrs[id];
|
|
|
|
if (!attr)
|
|
return 0;
|
|
|
|
*limit = nla_get_u32(attr);
|
|
if (*limit > MPTCP_PM_ADDR_MAX) {
|
|
GENL_SET_ERR_MSG(info, "limit greater than maximum");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
|
|
unsigned int rcv_addrs, subflows;
|
|
int ret;
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
rcv_addrs = pernet->add_addr_accept_max;
|
|
ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
subflows = pernet->subflows_max;
|
|
ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs);
|
|
WRITE_ONCE(pernet->subflows_max, subflows);
|
|
|
|
unlock:
|
|
spin_unlock_bh(&pernet->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
|
|
struct sk_buff *msg;
|
|
void *reply;
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0,
|
|
MPTCP_PM_CMD_GET_LIMITS);
|
|
if (!reply)
|
|
goto fail;
|
|
|
|
if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS,
|
|
READ_ONCE(pernet->add_addr_accept_max)))
|
|
goto fail;
|
|
|
|
if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS,
|
|
READ_ONCE(pernet->subflows_max)))
|
|
goto fail;
|
|
|
|
genlmsg_end(msg, reply);
|
|
return genlmsg_reply(msg, info);
|
|
|
|
fail:
|
|
GENL_SET_ERR_MSG(info, "not enough space in Netlink message");
|
|
nlmsg_free(msg);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static struct genl_ops mptcp_pm_ops[] = {
|
|
{
|
|
.cmd = MPTCP_PM_CMD_ADD_ADDR,
|
|
.doit = mptcp_nl_cmd_add_addr,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_DEL_ADDR,
|
|
.doit = mptcp_nl_cmd_del_addr,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_FLUSH_ADDRS,
|
|
.doit = mptcp_nl_cmd_flush_addrs,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_GET_ADDR,
|
|
.doit = mptcp_nl_cmd_get_addr,
|
|
.dumpit = mptcp_nl_cmd_dump_addrs,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_SET_LIMITS,
|
|
.doit = mptcp_nl_cmd_set_limits,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_GET_LIMITS,
|
|
.doit = mptcp_nl_cmd_get_limits,
|
|
},
|
|
};
|
|
|
|
static struct genl_family mptcp_genl_family __ro_after_init = {
|
|
.name = MPTCP_PM_NAME,
|
|
.version = MPTCP_PM_VER,
|
|
.maxattr = MPTCP_PM_ATTR_MAX,
|
|
.policy = mptcp_pm_policy,
|
|
.netnsok = true,
|
|
.module = THIS_MODULE,
|
|
.ops = mptcp_pm_ops,
|
|
.n_ops = ARRAY_SIZE(mptcp_pm_ops),
|
|
.mcgrps = mptcp_pm_mcgrps,
|
|
.n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps),
|
|
};
|
|
|
|
static int __net_init pm_nl_init_net(struct net *net)
|
|
{
|
|
struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id);
|
|
|
|
INIT_LIST_HEAD_RCU(&pernet->local_addr_list);
|
|
__reset_counters(pernet);
|
|
pernet->next_id = 1;
|
|
spin_lock_init(&pernet->lock);
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit pm_nl_exit_net(struct list_head *net_list)
|
|
{
|
|
struct net *net;
|
|
|
|
list_for_each_entry(net, net_list, exit_list) {
|
|
/* net is removed from namespace list, can't race with
|
|
* other modifiers
|
|
*/
|
|
__flush_addrs(net_generic(net, pm_nl_pernet_id));
|
|
}
|
|
}
|
|
|
|
static struct pernet_operations mptcp_pm_pernet_ops = {
|
|
.init = pm_nl_init_net,
|
|
.exit_batch = pm_nl_exit_net,
|
|
.id = &pm_nl_pernet_id,
|
|
.size = sizeof(struct pm_nl_pernet),
|
|
};
|
|
|
|
void mptcp_pm_nl_init(void)
|
|
{
|
|
if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0)
|
|
panic("Failed to register MPTCP PM pernet subsystem.\n");
|
|
|
|
if (genl_register_family(&mptcp_genl_family))
|
|
panic("Failed to register MPTCP PM netlink family\n");
|
|
}
|