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![Jakub Kicinski](/assets/img/avatar_default.png)
net/devlink/leftover.c / net/core/devlink.c:565b4824c3
("devlink: change port event netdev notifier from per-net to global")f05bd8ebeb
("devlink: move code to a dedicated directory")687125b579
("devlink: split out core code") https://lore.kernel.org/all/20230208094657.379f2b1a@canb.auug.org.au/ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2391 lines
59 KiB
C
2391 lines
59 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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#include "mib.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_add_entry {
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struct list_head list;
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struct mptcp_addr_info addr;
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struct timer_list add_timer;
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struct mptcp_sock *sock;
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u8 retrans_times;
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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 stale_loss_cnt;
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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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DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
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};
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#define MPTCP_PM_ADDR_MAX 8
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#define ADD_ADDR_RETRANS_MAX 3
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static struct pm_nl_pernet *pm_nl_get_pernet(const struct net *net)
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{
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return net_generic(net, pm_nl_pernet_id);
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}
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static struct pm_nl_pernet *
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pm_nl_get_pernet_from_msk(const struct mptcp_sock *msk)
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{
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return pm_nl_get_pernet(sock_net((struct sock *)msk));
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}
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bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
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const 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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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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} else if (a->family == AF_INET) {
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if (ipv6_addr_v4mapped(&b->addr6))
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addr_equals = a->addr.s_addr == b->addr6.s6_addr32[3];
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} else if (b->family == AF_INET) {
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if (ipv6_addr_v4mapped(&a->addr6))
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addr_equals = a->addr6.s6_addr32[3] == b->addr.s_addr;
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#endif
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}
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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->family = skc->skc_family;
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addr->port = htons(skc->skc_num);
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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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const 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 (mptcp_addresses_equal(&cur, saddr, saddr->port))
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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 bool lookup_subflow_by_daddr(const struct list_head *list,
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const struct mptcp_addr_info *daddr)
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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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remote_address(skc, &cur);
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if (mptcp_addresses_equal(&cur, daddr, daddr->port))
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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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const struct mptcp_sock *msk)
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{
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struct mptcp_pm_addr_entry *entry, *ret = NULL;
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msk_owned_by_me(msk);
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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 (!(entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW))
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continue;
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if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap))
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continue;
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ret = entry;
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break;
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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 struct mptcp_pm_addr_entry *
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select_signal_address(struct pm_nl_pernet *pernet, const 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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/* 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 (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap))
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continue;
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if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL))
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continue;
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ret = entry;
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break;
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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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unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk)
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{
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const struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
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return READ_ONCE(pernet->add_addr_signal_max);
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}
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EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_signal_max);
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unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk)
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{
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struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
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return READ_ONCE(pernet->add_addr_accept_max);
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}
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EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_accept_max);
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unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk)
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{
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struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
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return READ_ONCE(pernet->subflows_max);
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}
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EXPORT_SYMBOL_GPL(mptcp_pm_get_subflows_max);
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unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk)
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{
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struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
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return READ_ONCE(pernet->local_addr_max);
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}
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EXPORT_SYMBOL_GPL(mptcp_pm_get_local_addr_max);
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bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk)
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{
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struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
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if (msk->pm.subflows == mptcp_pm_get_subflows_max(msk) ||
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(find_next_and_bit(pernet->id_bitmap, msk->pm.id_avail_bitmap,
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MPTCP_PM_MAX_ADDR_ID + 1, 0) == MPTCP_PM_MAX_ADDR_ID + 1)) {
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WRITE_ONCE(msk->pm.work_pending, false);
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return false;
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}
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return true;
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}
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struct mptcp_pm_add_entry *
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mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
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const struct mptcp_addr_info *addr)
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{
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struct mptcp_pm_add_entry *entry;
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lockdep_assert_held(&msk->pm.lock);
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list_for_each_entry(entry, &msk->pm.anno_list, list) {
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if (mptcp_addresses_equal(&entry->addr, addr, true))
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return entry;
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}
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return NULL;
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}
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bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk)
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{
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struct mptcp_pm_add_entry *entry;
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struct mptcp_addr_info saddr;
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bool ret = false;
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local_address((struct sock_common *)sk, &saddr);
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spin_lock_bh(&msk->pm.lock);
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list_for_each_entry(entry, &msk->pm.anno_list, list) {
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if (mptcp_addresses_equal(&entry->addr, &saddr, true)) {
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ret = true;
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goto out;
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}
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}
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out:
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spin_unlock_bh(&msk->pm.lock);
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return ret;
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}
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static void mptcp_pm_add_timer(struct timer_list *timer)
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{
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struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer);
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struct mptcp_sock *msk = entry->sock;
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struct sock *sk = (struct sock *)msk;
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pr_debug("msk=%p", msk);
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if (!msk)
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return;
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if (inet_sk_state_load(sk) == TCP_CLOSE)
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return;
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if (!entry->addr.id)
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return;
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if (mptcp_pm_should_add_signal_addr(msk)) {
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sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8);
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goto out;
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}
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spin_lock_bh(&msk->pm.lock);
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if (!mptcp_pm_should_add_signal_addr(msk)) {
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pr_debug("retransmit ADD_ADDR id=%d", entry->addr.id);
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mptcp_pm_announce_addr(msk, &entry->addr, false);
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mptcp_pm_add_addr_send_ack(msk);
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entry->retrans_times++;
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}
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if (entry->retrans_times < ADD_ADDR_RETRANS_MAX)
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sk_reset_timer(sk, timer,
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jiffies + mptcp_get_add_addr_timeout(sock_net(sk)));
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spin_unlock_bh(&msk->pm.lock);
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if (entry->retrans_times == ADD_ADDR_RETRANS_MAX)
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mptcp_pm_subflow_established(msk);
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out:
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__sock_put(sk);
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}
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struct mptcp_pm_add_entry *
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mptcp_pm_del_add_timer(struct mptcp_sock *msk,
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const struct mptcp_addr_info *addr, bool check_id)
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{
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struct mptcp_pm_add_entry *entry;
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struct sock *sk = (struct sock *)msk;
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spin_lock_bh(&msk->pm.lock);
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entry = mptcp_lookup_anno_list_by_saddr(msk, addr);
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if (entry && (!check_id || entry->addr.id == addr->id))
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entry->retrans_times = ADD_ADDR_RETRANS_MAX;
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spin_unlock_bh(&msk->pm.lock);
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if (entry && (!check_id || entry->addr.id == addr->id))
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sk_stop_timer_sync(sk, &entry->add_timer);
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return entry;
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}
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bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
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const struct mptcp_pm_addr_entry *entry)
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{
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struct mptcp_pm_add_entry *add_entry = NULL;
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struct sock *sk = (struct sock *)msk;
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struct net *net = sock_net(sk);
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lockdep_assert_held(&msk->pm.lock);
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add_entry = mptcp_lookup_anno_list_by_saddr(msk, &entry->addr);
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if (add_entry) {
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if (mptcp_pm_is_kernel(msk))
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return false;
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sk_reset_timer(sk, &add_entry->add_timer,
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jiffies + mptcp_get_add_addr_timeout(net));
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return true;
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}
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add_entry = kmalloc(sizeof(*add_entry), GFP_ATOMIC);
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if (!add_entry)
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return false;
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list_add(&add_entry->list, &msk->pm.anno_list);
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add_entry->addr = entry->addr;
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add_entry->sock = msk;
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add_entry->retrans_times = 0;
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timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0);
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sk_reset_timer(sk, &add_entry->add_timer,
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jiffies + mptcp_get_add_addr_timeout(net));
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return true;
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}
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void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
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{
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struct mptcp_pm_add_entry *entry, *tmp;
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struct sock *sk = (struct sock *)msk;
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LIST_HEAD(free_list);
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pr_debug("msk=%p", msk);
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spin_lock_bh(&msk->pm.lock);
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list_splice_init(&msk->pm.anno_list, &free_list);
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spin_unlock_bh(&msk->pm.lock);
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list_for_each_entry_safe(entry, tmp, &free_list, list) {
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sk_stop_timer_sync(sk, &entry->add_timer);
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kfree(entry);
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}
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}
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static bool lookup_address_in_vec(const struct mptcp_addr_info *addrs, unsigned int nr,
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const struct mptcp_addr_info *addr)
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{
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int i;
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for (i = 0; i < nr; i++) {
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if (addrs[i].id == addr->id)
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return true;
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}
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return false;
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}
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/* Fill all the remote addresses into the array addrs[],
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* and return the array size.
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*/
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static unsigned int fill_remote_addresses_vec(struct mptcp_sock *msk,
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struct mptcp_addr_info *local,
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bool fullmesh,
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struct mptcp_addr_info *addrs)
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{
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bool deny_id0 = READ_ONCE(msk->pm.remote_deny_join_id0);
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struct sock *sk = (struct sock *)msk, *ssk;
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struct mptcp_subflow_context *subflow;
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struct mptcp_addr_info remote = { 0 };
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unsigned int subflows_max;
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int i = 0;
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subflows_max = mptcp_pm_get_subflows_max(msk);
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remote_address((struct sock_common *)sk, &remote);
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/* Non-fullmesh endpoint, fill in the single entry
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* corresponding to the primary MPC subflow remote address
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*/
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if (!fullmesh) {
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if (deny_id0)
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return 0;
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|
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if (!mptcp_pm_addr_families_match(sk, local, &remote))
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return 0;
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msk->pm.subflows++;
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addrs[i++] = remote;
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} else {
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mptcp_for_each_subflow(msk, subflow) {
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ssk = mptcp_subflow_tcp_sock(subflow);
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remote_address((struct sock_common *)ssk, &addrs[i]);
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addrs[i].id = subflow->remote_id;
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if (deny_id0 && !addrs[i].id)
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continue;
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|
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if (!mptcp_pm_addr_families_match(sk, local, &addrs[i]))
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continue;
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if (!lookup_address_in_vec(addrs, i, &addrs[i]) &&
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msk->pm.subflows < subflows_max) {
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msk->pm.subflows++;
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i++;
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}
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}
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}
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return i;
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}
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static void __mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow,
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bool prio, bool backup)
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{
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struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
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bool slow;
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pr_debug("send ack for %s",
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prio ? "mp_prio" : (mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr"));
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slow = lock_sock_fast(ssk);
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if (prio) {
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if (subflow->backup != backup)
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msk->last_snd = NULL;
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|
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subflow->send_mp_prio = 1;
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subflow->backup = backup;
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subflow->request_bkup = backup;
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}
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|
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__mptcp_subflow_send_ack(ssk);
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unlock_sock_fast(ssk, slow);
|
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}
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|
|
static void mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow,
|
|
bool prio, bool backup)
|
|
{
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
__mptcp_pm_send_ack(msk, subflow, prio, backup);
|
|
spin_lock_bh(&msk->pm.lock);
|
|
}
|
|
|
|
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 struct mptcp_pm_addr_entry *
|
|
__lookup_addr(struct pm_nl_pernet *pernet, const struct mptcp_addr_info *info,
|
|
bool lookup_by_id)
|
|
{
|
|
struct mptcp_pm_addr_entry *entry;
|
|
|
|
list_for_each_entry(entry, &pernet->local_addr_list, list) {
|
|
if ((!lookup_by_id &&
|
|
mptcp_addresses_equal(&entry->addr, info, entry->addr.port)) ||
|
|
(lookup_by_id && entry->addr.id == info->id))
|
|
return entry;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
|
|
{
|
|
struct sock *sk = (struct sock *)msk;
|
|
struct mptcp_pm_addr_entry *local;
|
|
unsigned int add_addr_signal_max;
|
|
unsigned int local_addr_max;
|
|
struct pm_nl_pernet *pernet;
|
|
unsigned int subflows_max;
|
|
|
|
pernet = pm_nl_get_pernet(sock_net(sk));
|
|
|
|
add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk);
|
|
local_addr_max = mptcp_pm_get_local_addr_max(msk);
|
|
subflows_max = mptcp_pm_get_subflows_max(msk);
|
|
|
|
/* do lazy endpoint usage accounting for the MPC subflows */
|
|
if (unlikely(!(msk->pm.status & BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED))) && msk->first) {
|
|
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(msk->first);
|
|
struct mptcp_pm_addr_entry *entry;
|
|
struct mptcp_addr_info mpc_addr;
|
|
bool backup = false;
|
|
|
|
local_address((struct sock_common *)msk->first, &mpc_addr);
|
|
rcu_read_lock();
|
|
entry = __lookup_addr(pernet, &mpc_addr, false);
|
|
if (entry) {
|
|
__clear_bit(entry->addr.id, msk->pm.id_avail_bitmap);
|
|
msk->mpc_endpoint_id = entry->addr.id;
|
|
backup = !!(entry->flags & MPTCP_PM_ADDR_FLAG_BACKUP);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (backup)
|
|
mptcp_pm_send_ack(msk, subflow, true, backup);
|
|
|
|
msk->pm.status |= BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED);
|
|
}
|
|
|
|
pr_debug("local %d:%d signal %d:%d subflows %d:%d\n",
|
|
msk->pm.local_addr_used, local_addr_max,
|
|
msk->pm.add_addr_signaled, add_addr_signal_max,
|
|
msk->pm.subflows, subflows_max);
|
|
|
|
/* check first for announce */
|
|
if (msk->pm.add_addr_signaled < add_addr_signal_max) {
|
|
local = select_signal_address(pernet, msk);
|
|
|
|
/* due to racing events on both ends we can reach here while
|
|
* previous add address is still running: if we invoke now
|
|
* mptcp_pm_announce_addr(), that will fail and the
|
|
* corresponding id will be marked as used.
|
|
* Instead let the PM machinery reschedule us when the
|
|
* current address announce will be completed.
|
|
*/
|
|
if (msk->pm.addr_signal & BIT(MPTCP_ADD_ADDR_SIGNAL))
|
|
return;
|
|
|
|
if (local) {
|
|
if (mptcp_pm_alloc_anno_list(msk, local)) {
|
|
__clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
|
|
msk->pm.add_addr_signaled++;
|
|
mptcp_pm_announce_addr(msk, &local->addr, false);
|
|
mptcp_pm_nl_addr_send_ack(msk);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* check if should create a new subflow */
|
|
while (msk->pm.local_addr_used < local_addr_max &&
|
|
msk->pm.subflows < subflows_max) {
|
|
struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
|
|
bool fullmesh;
|
|
int i, nr;
|
|
|
|
local = select_local_address(pernet, msk);
|
|
if (!local)
|
|
break;
|
|
|
|
fullmesh = !!(local->flags & MPTCP_PM_ADDR_FLAG_FULLMESH);
|
|
|
|
msk->pm.local_addr_used++;
|
|
__clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
|
|
nr = fill_remote_addresses_vec(msk, &local->addr, fullmesh, addrs);
|
|
if (nr == 0)
|
|
continue;
|
|
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
for (i = 0; i < nr; i++)
|
|
__mptcp_subflow_connect(sk, &local->addr, &addrs[i]);
|
|
spin_lock_bh(&msk->pm.lock);
|
|
}
|
|
mptcp_pm_nl_check_work_pending(msk);
|
|
}
|
|
|
|
static void mptcp_pm_nl_fully_established(struct mptcp_sock *msk)
|
|
{
|
|
mptcp_pm_create_subflow_or_signal_addr(msk);
|
|
}
|
|
|
|
static void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk)
|
|
{
|
|
mptcp_pm_create_subflow_or_signal_addr(msk);
|
|
}
|
|
|
|
/* Fill all the local addresses into the array addrs[],
|
|
* and return the array size.
|
|
*/
|
|
static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
|
|
struct mptcp_addr_info *remote,
|
|
struct mptcp_addr_info *addrs)
|
|
{
|
|
struct sock *sk = (struct sock *)msk;
|
|
struct mptcp_pm_addr_entry *entry;
|
|
struct pm_nl_pernet *pernet;
|
|
unsigned int subflows_max;
|
|
int i = 0;
|
|
|
|
pernet = pm_nl_get_pernet_from_msk(msk);
|
|
subflows_max = mptcp_pm_get_subflows_max(msk);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
|
|
if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH))
|
|
continue;
|
|
|
|
if (!mptcp_pm_addr_families_match(sk, &entry->addr, remote))
|
|
continue;
|
|
|
|
if (msk->pm.subflows < subflows_max) {
|
|
msk->pm.subflows++;
|
|
addrs[i++] = entry->addr;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
/* If the array is empty, fill in the single
|
|
* 'IPADDRANY' local address
|
|
*/
|
|
if (!i) {
|
|
struct mptcp_addr_info local;
|
|
|
|
memset(&local, 0, sizeof(local));
|
|
local.family =
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
remote->family == AF_INET6 &&
|
|
ipv6_addr_v4mapped(&remote->addr6) ? AF_INET :
|
|
#endif
|
|
remote->family;
|
|
|
|
if (!mptcp_pm_addr_families_match(sk, &local, remote))
|
|
return 0;
|
|
|
|
msk->pm.subflows++;
|
|
addrs[i++] = local;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
|
|
{
|
|
struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
|
|
struct sock *sk = (struct sock *)msk;
|
|
unsigned int add_addr_accept_max;
|
|
struct mptcp_addr_info remote;
|
|
unsigned int subflows_max;
|
|
int i, nr;
|
|
|
|
add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk);
|
|
subflows_max = mptcp_pm_get_subflows_max(msk);
|
|
|
|
pr_debug("accepted %d:%d remote family %d",
|
|
msk->pm.add_addr_accepted, add_addr_accept_max,
|
|
msk->pm.remote.family);
|
|
|
|
remote = msk->pm.remote;
|
|
mptcp_pm_announce_addr(msk, &remote, true);
|
|
mptcp_pm_nl_addr_send_ack(msk);
|
|
|
|
if (lookup_subflow_by_daddr(&msk->conn_list, &remote))
|
|
return;
|
|
|
|
/* pick id 0 port, if none is provided the remote address */
|
|
if (!remote.port)
|
|
remote.port = sk->sk_dport;
|
|
|
|
/* connect to the specified remote address, using whatever
|
|
* local address the routing configuration will pick.
|
|
*/
|
|
nr = fill_local_addresses_vec(msk, &remote, addrs);
|
|
if (nr == 0)
|
|
return;
|
|
|
|
msk->pm.add_addr_accepted++;
|
|
if (msk->pm.add_addr_accepted >= add_addr_accept_max ||
|
|
msk->pm.subflows >= subflows_max)
|
|
WRITE_ONCE(msk->pm.accept_addr, false);
|
|
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
for (i = 0; i < nr; i++)
|
|
__mptcp_subflow_connect(sk, &addrs[i], &remote);
|
|
spin_lock_bh(&msk->pm.lock);
|
|
}
|
|
|
|
void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk)
|
|
{
|
|
struct mptcp_subflow_context *subflow;
|
|
|
|
msk_owned_by_me(msk);
|
|
lockdep_assert_held(&msk->pm.lock);
|
|
|
|
if (!mptcp_pm_should_add_signal(msk) &&
|
|
!mptcp_pm_should_rm_signal(msk))
|
|
return;
|
|
|
|
subflow = list_first_entry_or_null(&msk->conn_list, typeof(*subflow), node);
|
|
if (subflow)
|
|
mptcp_pm_send_ack(msk, subflow, false, false);
|
|
}
|
|
|
|
int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
|
|
struct mptcp_addr_info *addr,
|
|
struct mptcp_addr_info *rem,
|
|
u8 bkup)
|
|
{
|
|
struct mptcp_subflow_context *subflow;
|
|
|
|
pr_debug("bkup=%d", bkup);
|
|
|
|
mptcp_for_each_subflow(msk, subflow) {
|
|
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
|
|
struct mptcp_addr_info local, remote;
|
|
|
|
local_address((struct sock_common *)ssk, &local);
|
|
if (!mptcp_addresses_equal(&local, addr, addr->port))
|
|
continue;
|
|
|
|
if (rem && rem->family != AF_UNSPEC) {
|
|
remote_address((struct sock_common *)ssk, &remote);
|
|
if (!mptcp_addresses_equal(&remote, rem, rem->port))
|
|
continue;
|
|
}
|
|
|
|
__mptcp_pm_send_ack(msk, subflow, true, bkup);
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static bool mptcp_local_id_match(const struct mptcp_sock *msk, u8 local_id, u8 id)
|
|
{
|
|
return local_id == id || (!local_id && msk->mpc_endpoint_id == id);
|
|
}
|
|
|
|
static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk,
|
|
const struct mptcp_rm_list *rm_list,
|
|
enum linux_mptcp_mib_field rm_type)
|
|
{
|
|
struct mptcp_subflow_context *subflow, *tmp;
|
|
struct sock *sk = (struct sock *)msk;
|
|
u8 i;
|
|
|
|
pr_debug("%s rm_list_nr %d",
|
|
rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", rm_list->nr);
|
|
|
|
msk_owned_by_me(msk);
|
|
|
|
if (sk->sk_state == TCP_LISTEN)
|
|
return;
|
|
|
|
if (!rm_list->nr)
|
|
return;
|
|
|
|
if (list_empty(&msk->conn_list))
|
|
return;
|
|
|
|
for (i = 0; i < rm_list->nr; i++) {
|
|
u8 rm_id = rm_list->ids[i];
|
|
bool removed = false;
|
|
|
|
mptcp_for_each_subflow_safe(msk, subflow, tmp) {
|
|
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
|
|
int how = RCV_SHUTDOWN | SEND_SHUTDOWN;
|
|
u8 id = subflow->local_id;
|
|
|
|
if (rm_type == MPTCP_MIB_RMADDR && subflow->remote_id != rm_id)
|
|
continue;
|
|
if (rm_type == MPTCP_MIB_RMSUBFLOW && !mptcp_local_id_match(msk, id, rm_id))
|
|
continue;
|
|
|
|
pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u mpc_id=%u",
|
|
rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow",
|
|
i, rm_id, subflow->local_id, subflow->remote_id,
|
|
msk->mpc_endpoint_id);
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
mptcp_subflow_shutdown(sk, ssk, how);
|
|
|
|
/* the following takes care of updating the subflows counter */
|
|
mptcp_close_ssk(sk, ssk, subflow);
|
|
spin_lock_bh(&msk->pm.lock);
|
|
|
|
removed = true;
|
|
__MPTCP_INC_STATS(sock_net(sk), rm_type);
|
|
}
|
|
if (rm_type == MPTCP_MIB_RMSUBFLOW)
|
|
__set_bit(rm_id ? rm_id : msk->mpc_endpoint_id, msk->pm.id_avail_bitmap);
|
|
if (!removed)
|
|
continue;
|
|
|
|
if (!mptcp_pm_is_kernel(msk))
|
|
continue;
|
|
|
|
if (rm_type == MPTCP_MIB_RMADDR) {
|
|
msk->pm.add_addr_accepted--;
|
|
WRITE_ONCE(msk->pm.accept_addr, true);
|
|
} else if (rm_type == MPTCP_MIB_RMSUBFLOW) {
|
|
msk->pm.local_addr_used--;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk)
|
|
{
|
|
mptcp_pm_nl_rm_addr_or_subflow(msk, &msk->pm.rm_list_rx, MPTCP_MIB_RMADDR);
|
|
}
|
|
|
|
void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
|
|
const struct mptcp_rm_list *rm_list)
|
|
{
|
|
mptcp_pm_nl_rm_addr_or_subflow(msk, rm_list, MPTCP_MIB_RMSUBFLOW);
|
|
}
|
|
|
|
void mptcp_pm_nl_work(struct mptcp_sock *msk)
|
|
{
|
|
struct mptcp_pm_data *pm = &msk->pm;
|
|
|
|
msk_owned_by_me(msk);
|
|
|
|
if (!(pm->status & MPTCP_PM_WORK_MASK))
|
|
return;
|
|
|
|
spin_lock_bh(&msk->pm.lock);
|
|
|
|
pr_debug("msk=%p status=%x", msk, pm->status);
|
|
if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) {
|
|
pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED);
|
|
mptcp_pm_nl_add_addr_received(msk);
|
|
}
|
|
if (pm->status & BIT(MPTCP_PM_ADD_ADDR_SEND_ACK)) {
|
|
pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_SEND_ACK);
|
|
mptcp_pm_nl_addr_send_ack(msk);
|
|
}
|
|
if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) {
|
|
pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED);
|
|
mptcp_pm_nl_rm_addr_received(msk);
|
|
}
|
|
if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) {
|
|
pm->status &= ~BIT(MPTCP_PM_ESTABLISHED);
|
|
mptcp_pm_nl_fully_established(msk);
|
|
}
|
|
if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) {
|
|
pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED);
|
|
mptcp_pm_nl_subflow_established(msk);
|
|
}
|
|
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
}
|
|
|
|
static bool address_use_port(struct mptcp_pm_addr_entry *entry)
|
|
{
|
|
return (entry->flags &
|
|
(MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) ==
|
|
MPTCP_PM_ADDR_FLAG_SIGNAL;
|
|
}
|
|
|
|
/* caller must ensure the RCU grace period is already elapsed */
|
|
static void __mptcp_pm_release_addr_entry(struct mptcp_pm_addr_entry *entry)
|
|
{
|
|
if (entry->lsk)
|
|
sock_release(entry->lsk);
|
|
kfree(entry);
|
|
}
|
|
|
|
static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet,
|
|
struct mptcp_pm_addr_entry *entry)
|
|
{
|
|
struct mptcp_pm_addr_entry *cur, *del_entry = NULL;
|
|
unsigned int addr_max;
|
|
int ret = -EINVAL;
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
/* to keep the code simple, don't do IDR-like allocation for address ID,
|
|
* just bail when we exceed limits
|
|
*/
|
|
if (pernet->next_id == MPTCP_PM_MAX_ADDR_ID)
|
|
pernet->next_id = 1;
|
|
if (pernet->addrs >= MPTCP_PM_ADDR_MAX) {
|
|
ret = -ERANGE;
|
|
goto out;
|
|
}
|
|
if (test_bit(entry->addr.id, pernet->id_bitmap)) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
/* do not insert duplicate address, differentiate on port only
|
|
* singled addresses
|
|
*/
|
|
if (!address_use_port(entry))
|
|
entry->addr.port = 0;
|
|
list_for_each_entry(cur, &pernet->local_addr_list, list) {
|
|
if (mptcp_addresses_equal(&cur->addr, &entry->addr,
|
|
cur->addr.port || entry->addr.port)) {
|
|
/* allow replacing the exiting endpoint only if such
|
|
* endpoint is an implicit one and the user-space
|
|
* did not provide an endpoint id
|
|
*/
|
|
if (!(cur->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT)) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
if (entry->addr.id)
|
|
goto out;
|
|
|
|
pernet->addrs--;
|
|
entry->addr.id = cur->addr.id;
|
|
list_del_rcu(&cur->list);
|
|
del_entry = cur;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!entry->addr.id) {
|
|
find_next:
|
|
entry->addr.id = find_next_zero_bit(pernet->id_bitmap,
|
|
MPTCP_PM_MAX_ADDR_ID + 1,
|
|
pernet->next_id);
|
|
if (!entry->addr.id && pernet->next_id != 1) {
|
|
pernet->next_id = 1;
|
|
goto find_next;
|
|
}
|
|
}
|
|
|
|
if (!entry->addr.id)
|
|
goto out;
|
|
|
|
__set_bit(entry->addr.id, pernet->id_bitmap);
|
|
if (entry->addr.id > pernet->next_id)
|
|
pernet->next_id = entry->addr.id;
|
|
|
|
if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
|
|
addr_max = pernet->add_addr_signal_max;
|
|
WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1);
|
|
}
|
|
if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
|
|
addr_max = pernet->local_addr_max;
|
|
WRITE_ONCE(pernet->local_addr_max, addr_max + 1);
|
|
}
|
|
|
|
pernet->addrs++;
|
|
if (!entry->addr.port)
|
|
list_add_tail_rcu(&entry->list, &pernet->local_addr_list);
|
|
else
|
|
list_add_rcu(&entry->list, &pernet->local_addr_list);
|
|
ret = entry->addr.id;
|
|
|
|
out:
|
|
spin_unlock_bh(&pernet->lock);
|
|
|
|
/* just replaced an existing entry, free it */
|
|
if (del_entry) {
|
|
synchronize_rcu();
|
|
__mptcp_pm_release_addr_entry(del_entry);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
|
|
struct mptcp_pm_addr_entry *entry)
|
|
{
|
|
int addrlen = sizeof(struct sockaddr_in);
|
|
struct sockaddr_storage addr;
|
|
struct socket *ssock;
|
|
struct sock *newsk;
|
|
int backlog = 1024;
|
|
int err;
|
|
|
|
err = sock_create_kern(sock_net(sk), entry->addr.family,
|
|
SOCK_STREAM, IPPROTO_MPTCP, &entry->lsk);
|
|
if (err)
|
|
return err;
|
|
|
|
newsk = entry->lsk->sk;
|
|
if (!newsk)
|
|
return -EINVAL;
|
|
|
|
lock_sock(newsk);
|
|
ssock = __mptcp_nmpc_socket(mptcp_sk(newsk));
|
|
release_sock(newsk);
|
|
if (!ssock)
|
|
return -EINVAL;
|
|
|
|
mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family);
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
if (entry->addr.family == AF_INET6)
|
|
addrlen = sizeof(struct sockaddr_in6);
|
|
#endif
|
|
err = kernel_bind(ssock, (struct sockaddr *)&addr, addrlen);
|
|
if (err)
|
|
return err;
|
|
|
|
err = kernel_listen(ssock, backlog);
|
|
if (err)
|
|
return err;
|
|
|
|
mptcp_event_pm_listener(ssock->sk, MPTCP_EVENT_LISTENER_CREATED);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
|
|
{
|
|
struct mptcp_pm_addr_entry *entry;
|
|
struct mptcp_addr_info skc_local;
|
|
struct mptcp_addr_info msk_local;
|
|
struct pm_nl_pernet *pernet;
|
|
int ret = -1;
|
|
|
|
if (WARN_ON_ONCE(!msk))
|
|
return -1;
|
|
|
|
/* The 0 ID mapping is defined by the first subflow, copied into the msk
|
|
* addr
|
|
*/
|
|
local_address((struct sock_common *)msk, &msk_local);
|
|
local_address((struct sock_common *)skc, &skc_local);
|
|
if (mptcp_addresses_equal(&msk_local, &skc_local, false))
|
|
return 0;
|
|
|
|
if (mptcp_pm_is_userspace(msk))
|
|
return mptcp_userspace_pm_get_local_id(msk, &skc_local);
|
|
|
|
pernet = pm_nl_get_pernet_from_msk(msk);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
|
|
if (mptcp_addresses_equal(&entry->addr, &skc_local, entry->addr.port)) {
|
|
ret = entry->addr.id;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
if (ret >= 0)
|
|
return ret;
|
|
|
|
/* address not found, add to local list */
|
|
entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
entry->addr = skc_local;
|
|
entry->addr.id = 0;
|
|
entry->addr.port = 0;
|
|
entry->ifindex = 0;
|
|
entry->flags = MPTCP_PM_ADDR_FLAG_IMPLICIT;
|
|
entry->lsk = NULL;
|
|
ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
|
|
if (ret < 0)
|
|
kfree(entry);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define MPTCP_PM_CMD_GRP_OFFSET 0
|
|
#define MPTCP_PM_EV_GRP_OFFSET 1
|
|
|
|
static const struct genl_multicast_group mptcp_pm_mcgrps[] = {
|
|
[MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, },
|
|
[MPTCP_PM_EV_GRP_OFFSET] = { .name = MPTCP_PM_EV_GRP_NAME,
|
|
.flags = GENL_UNS_ADMIN_PERM,
|
|
},
|
|
};
|
|
|
|
static const struct nla_policy
|
|
mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = {
|
|
[MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, },
|
|
[MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, },
|
|
[MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, },
|
|
[MPTCP_PM_ADDR_ATTR_ADDR6] =
|
|
NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
|
|
[MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 },
|
|
[MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 },
|
|
[MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 },
|
|
};
|
|
|
|
static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = {
|
|
[MPTCP_PM_ATTR_ADDR] =
|
|
NLA_POLICY_NESTED(mptcp_pm_addr_policy),
|
|
[MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, },
|
|
[MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, },
|
|
[MPTCP_PM_ATTR_TOKEN] = { .type = NLA_U32, },
|
|
[MPTCP_PM_ATTR_LOC_ID] = { .type = NLA_U8, },
|
|
[MPTCP_PM_ATTR_ADDR_REMOTE] =
|
|
NLA_POLICY_NESTED(mptcp_pm_addr_policy),
|
|
};
|
|
|
|
void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk)
|
|
{
|
|
struct mptcp_subflow_context *iter, *subflow = mptcp_subflow_ctx(ssk);
|
|
struct sock *sk = (struct sock *)msk;
|
|
unsigned int active_max_loss_cnt;
|
|
struct net *net = sock_net(sk);
|
|
unsigned int stale_loss_cnt;
|
|
bool slow;
|
|
|
|
stale_loss_cnt = mptcp_stale_loss_cnt(net);
|
|
if (subflow->stale || !stale_loss_cnt || subflow->stale_count <= stale_loss_cnt)
|
|
return;
|
|
|
|
/* look for another available subflow not in loss state */
|
|
active_max_loss_cnt = max_t(int, stale_loss_cnt - 1, 1);
|
|
mptcp_for_each_subflow(msk, iter) {
|
|
if (iter != subflow && mptcp_subflow_active(iter) &&
|
|
iter->stale_count < active_max_loss_cnt) {
|
|
/* we have some alternatives, try to mark this subflow as idle ...*/
|
|
slow = lock_sock_fast(ssk);
|
|
if (!tcp_rtx_and_write_queues_empty(ssk)) {
|
|
subflow->stale = 1;
|
|
__mptcp_retransmit_pending_data(sk);
|
|
MPTCP_INC_STATS(net, MPTCP_MIB_SUBFLOWSTALE);
|
|
}
|
|
unlock_sock_fast(ssk, slow);
|
|
|
|
/* always try to push the pending data regardless of re-injections:
|
|
* we can possibly use backup subflows now, and subflow selection
|
|
* is cheap under the msk socket lock
|
|
*/
|
|
__mptcp_push_pending(sk, 0);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int mptcp_pm_family_to_addr(int family)
|
|
{
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
if (family == AF_INET6)
|
|
return MPTCP_PM_ADDR_ATTR_ADDR6;
|
|
#endif
|
|
return MPTCP_PM_ADDR_ATTR_ADDR4;
|
|
}
|
|
|
|
static int mptcp_pm_parse_pm_addr_attr(struct nlattr *tb[],
|
|
const struct nlattr *attr,
|
|
struct genl_info *info,
|
|
struct mptcp_addr_info *addr,
|
|
bool require_family)
|
|
{
|
|
int err, addr_addr;
|
|
|
|
if (!attr) {
|
|
GENL_SET_ERR_MSG(info, "missing address info");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* no validation needed - was already done via nested policy */
|
|
err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr,
|
|
mptcp_pm_addr_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (tb[MPTCP_PM_ADDR_ATTR_ID])
|
|
addr->id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]);
|
|
|
|
if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) {
|
|
if (!require_family)
|
|
return 0;
|
|
|
|
NL_SET_ERR_MSG_ATTR(info->extack, attr,
|
|
"missing family");
|
|
return -EINVAL;
|
|
}
|
|
|
|
addr->family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]);
|
|
if (addr->family != AF_INET
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
&& addr->family != AF_INET6
|
|
#endif
|
|
) {
|
|
NL_SET_ERR_MSG_ATTR(info->extack, attr,
|
|
"unknown address family");
|
|
return -EINVAL;
|
|
}
|
|
addr_addr = mptcp_pm_family_to_addr(addr->family);
|
|
if (!tb[addr_addr]) {
|
|
NL_SET_ERR_MSG_ATTR(info->extack, attr,
|
|
"missing address data");
|
|
return -EINVAL;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
if (addr->family == AF_INET6)
|
|
addr->addr6 = nla_get_in6_addr(tb[addr_addr]);
|
|
else
|
|
#endif
|
|
addr->addr.s_addr = nla_get_in_addr(tb[addr_addr]);
|
|
|
|
if (tb[MPTCP_PM_ADDR_ATTR_PORT])
|
|
addr->port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
|
|
struct mptcp_addr_info *addr)
|
|
{
|
|
struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1];
|
|
|
|
memset(addr, 0, sizeof(*addr));
|
|
|
|
return mptcp_pm_parse_pm_addr_attr(tb, attr, info, addr, true);
|
|
}
|
|
|
|
int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info,
|
|
bool require_family,
|
|
struct mptcp_pm_addr_entry *entry)
|
|
{
|
|
struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1];
|
|
int err;
|
|
|
|
memset(entry, 0, sizeof(*entry));
|
|
|
|
err = mptcp_pm_parse_pm_addr_attr(tb, attr, info, &entry->addr, require_family);
|
|
if (err)
|
|
return err;
|
|
|
|
if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) {
|
|
u32 val = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]);
|
|
|
|
entry->ifindex = val;
|
|
}
|
|
|
|
if (tb[MPTCP_PM_ADDR_ATTR_FLAGS])
|
|
entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]);
|
|
|
|
if (tb[MPTCP_PM_ADDR_ATTR_PORT])
|
|
entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info)
|
|
{
|
|
return pm_nl_get_pernet(genl_info_net(info));
|
|
}
|
|
|
|
static int mptcp_nl_add_subflow_or_signal_addr(struct net *net)
|
|
{
|
|
struct mptcp_sock *msk;
|
|
long s_slot = 0, s_num = 0;
|
|
|
|
while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
|
|
struct sock *sk = (struct sock *)msk;
|
|
|
|
if (!READ_ONCE(msk->fully_established) ||
|
|
mptcp_pm_is_userspace(msk))
|
|
goto next;
|
|
|
|
lock_sock(sk);
|
|
spin_lock_bh(&msk->pm.lock);
|
|
mptcp_pm_create_subflow_or_signal_addr(msk);
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
release_sock(sk);
|
|
|
|
next:
|
|
sock_put(sk);
|
|
cond_resched();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_entry(attr, info, true, &addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (addr.addr.port && !(addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
|
|
GENL_SET_ERR_MSG(info, "flags must have signal when using port");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL &&
|
|
addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) {
|
|
GENL_SET_ERR_MSG(info, "flags mustn't have both signal and fullmesh");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (addr.flags & MPTCP_PM_ADDR_FLAG_IMPLICIT) {
|
|
GENL_SET_ERR_MSG(info, "can't create IMPLICIT endpoint");
|
|
return -EINVAL;
|
|
}
|
|
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL_ACCOUNT);
|
|
if (!entry) {
|
|
GENL_SET_ERR_MSG(info, "can't allocate addr");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*entry = addr;
|
|
if (entry->addr.port) {
|
|
ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry);
|
|
if (ret) {
|
|
GENL_SET_ERR_MSG_FMT(info, "create listen socket error: %d", ret);
|
|
goto out_free;
|
|
}
|
|
}
|
|
ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
|
|
if (ret < 0) {
|
|
GENL_SET_ERR_MSG_FMT(info, "too many addresses or duplicate one: %d", ret);
|
|
goto out_free;
|
|
}
|
|
|
|
mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk));
|
|
return 0;
|
|
|
|
out_free:
|
|
__mptcp_pm_release_addr_entry(entry);
|
|
return ret;
|
|
}
|
|
|
|
int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
|
|
u8 *flags, int *ifindex)
|
|
{
|
|
struct mptcp_pm_addr_entry *entry;
|
|
struct sock *sk = (struct sock *)msk;
|
|
struct net *net = sock_net(sk);
|
|
|
|
*flags = 0;
|
|
*ifindex = 0;
|
|
|
|
if (id) {
|
|
if (mptcp_pm_is_userspace(msk))
|
|
return mptcp_userspace_pm_get_flags_and_ifindex_by_id(msk,
|
|
id,
|
|
flags,
|
|
ifindex);
|
|
|
|
rcu_read_lock();
|
|
entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id);
|
|
if (entry) {
|
|
*flags = entry->flags;
|
|
*ifindex = entry->ifindex;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool remove_anno_list_by_saddr(struct mptcp_sock *msk,
|
|
const struct mptcp_addr_info *addr)
|
|
{
|
|
struct mptcp_pm_add_entry *entry;
|
|
|
|
entry = mptcp_pm_del_add_timer(msk, addr, false);
|
|
if (entry) {
|
|
list_del(&entry->list);
|
|
kfree(entry);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk,
|
|
const struct mptcp_addr_info *addr,
|
|
bool force)
|
|
{
|
|
struct mptcp_rm_list list = { .nr = 0 };
|
|
bool ret;
|
|
|
|
list.ids[list.nr++] = addr->id;
|
|
|
|
ret = remove_anno_list_by_saddr(msk, addr);
|
|
if (ret || force) {
|
|
spin_lock_bh(&msk->pm.lock);
|
|
mptcp_pm_remove_addr(msk, &list);
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net,
|
|
const struct mptcp_pm_addr_entry *entry)
|
|
{
|
|
const struct mptcp_addr_info *addr = &entry->addr;
|
|
struct mptcp_rm_list list = { .nr = 0 };
|
|
long s_slot = 0, s_num = 0;
|
|
struct mptcp_sock *msk;
|
|
|
|
pr_debug("remove_id=%d", addr->id);
|
|
|
|
list.ids[list.nr++] = addr->id;
|
|
|
|
while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
|
|
struct sock *sk = (struct sock *)msk;
|
|
bool remove_subflow;
|
|
|
|
if (mptcp_pm_is_userspace(msk))
|
|
goto next;
|
|
|
|
if (list_empty(&msk->conn_list)) {
|
|
mptcp_pm_remove_anno_addr(msk, addr, false);
|
|
goto next;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr);
|
|
mptcp_pm_remove_anno_addr(msk, addr, remove_subflow &&
|
|
!(entry->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT));
|
|
if (remove_subflow)
|
|
mptcp_pm_remove_subflow(msk, &list);
|
|
release_sock(sk);
|
|
|
|
next:
|
|
sock_put(sk);
|
|
cond_resched();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mptcp_nl_remove_id_zero_address(struct net *net,
|
|
struct mptcp_addr_info *addr)
|
|
{
|
|
struct mptcp_rm_list list = { .nr = 0 };
|
|
long s_slot = 0, s_num = 0;
|
|
struct mptcp_sock *msk;
|
|
|
|
list.ids[list.nr++] = 0;
|
|
|
|
while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
|
|
struct sock *sk = (struct sock *)msk;
|
|
struct mptcp_addr_info msk_local;
|
|
|
|
if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk))
|
|
goto next;
|
|
|
|
local_address((struct sock_common *)msk, &msk_local);
|
|
if (!mptcp_addresses_equal(&msk_local, addr, addr->port))
|
|
goto next;
|
|
|
|
lock_sock(sk);
|
|
spin_lock_bh(&msk->pm.lock);
|
|
mptcp_pm_remove_addr(msk, &list);
|
|
mptcp_pm_nl_rm_subflow_received(msk, &list);
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
release_sock(sk);
|
|
|
|
next:
|
|
sock_put(sk);
|
|
cond_resched();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
unsigned int addr_max;
|
|
int ret;
|
|
|
|
ret = mptcp_pm_parse_entry(attr, info, false, &addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* the zero id address is special: the first address used by the msk
|
|
* always gets such an id, so different subflows can have different zero
|
|
* id addresses. Additionally zero id is not accounted for in id_bitmap.
|
|
* Let's use an 'mptcp_rm_list' instead of the common remove code.
|
|
*/
|
|
if (addr.addr.id == 0)
|
|
return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr);
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
entry = __lookup_addr_by_id(pernet, addr.addr.id);
|
|
if (!entry) {
|
|
GENL_SET_ERR_MSG(info, "address not found");
|
|
spin_unlock_bh(&pernet->lock);
|
|
return -EINVAL;
|
|
}
|
|
if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
|
|
addr_max = pernet->add_addr_signal_max;
|
|
WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1);
|
|
}
|
|
if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
|
|
addr_max = pernet->local_addr_max;
|
|
WRITE_ONCE(pernet->local_addr_max, addr_max - 1);
|
|
}
|
|
|
|
pernet->addrs--;
|
|
list_del_rcu(&entry->list);
|
|
__clear_bit(entry->addr.id, pernet->id_bitmap);
|
|
spin_unlock_bh(&pernet->lock);
|
|
|
|
mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), entry);
|
|
synchronize_rcu();
|
|
__mptcp_pm_release_addr_entry(entry);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
|
|
struct list_head *rm_list)
|
|
{
|
|
struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 };
|
|
struct mptcp_pm_addr_entry *entry;
|
|
|
|
list_for_each_entry(entry, rm_list, list) {
|
|
if (lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) &&
|
|
slist.nr < MPTCP_RM_IDS_MAX)
|
|
slist.ids[slist.nr++] = entry->addr.id;
|
|
|
|
if (remove_anno_list_by_saddr(msk, &entry->addr) &&
|
|
alist.nr < MPTCP_RM_IDS_MAX)
|
|
alist.ids[alist.nr++] = entry->addr.id;
|
|
}
|
|
|
|
if (alist.nr) {
|
|
spin_lock_bh(&msk->pm.lock);
|
|
mptcp_pm_remove_addr(msk, &alist);
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
}
|
|
if (slist.nr)
|
|
mptcp_pm_remove_subflow(msk, &slist);
|
|
}
|
|
|
|
static void mptcp_nl_remove_addrs_list(struct net *net,
|
|
struct list_head *rm_list)
|
|
{
|
|
long s_slot = 0, s_num = 0;
|
|
struct mptcp_sock *msk;
|
|
|
|
if (list_empty(rm_list))
|
|
return;
|
|
|
|
while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
|
|
struct sock *sk = (struct sock *)msk;
|
|
|
|
if (!mptcp_pm_is_userspace(msk)) {
|
|
lock_sock(sk);
|
|
mptcp_pm_remove_addrs_and_subflows(msk, rm_list);
|
|
release_sock(sk);
|
|
}
|
|
|
|
sock_put(sk);
|
|
cond_resched();
|
|
}
|
|
}
|
|
|
|
/* caller must ensure the RCU grace period is already elapsed */
|
|
static void __flush_addrs(struct list_head *list)
|
|
{
|
|
while (!list_empty(list)) {
|
|
struct mptcp_pm_addr_entry *cur;
|
|
|
|
cur = list_entry(list->next,
|
|
struct mptcp_pm_addr_entry, list);
|
|
list_del_rcu(&cur->list);
|
|
__mptcp_pm_release_addr_entry(cur);
|
|
}
|
|
}
|
|
|
|
static void __reset_counters(struct pm_nl_pernet *pernet)
|
|
{
|
|
WRITE_ONCE(pernet->add_addr_signal_max, 0);
|
|
WRITE_ONCE(pernet->add_addr_accept_max, 0);
|
|
WRITE_ONCE(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);
|
|
LIST_HEAD(free_list);
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
list_splice_init(&pernet->local_addr_list, &free_list);
|
|
__reset_counters(pernet);
|
|
pernet->next_id = 1;
|
|
bitmap_zero(pernet->id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
|
|
spin_unlock_bh(&pernet->lock);
|
|
mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list);
|
|
synchronize_rcu();
|
|
__flush_addrs(&free_list);
|
|
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_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port)))
|
|
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_entry(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;
|
|
int i;
|
|
|
|
pernet = pm_nl_get_pernet(net);
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
for (i = id; i < MPTCP_PM_MAX_ADDR_ID + 1; i++) {
|
|
if (test_bit(i, pernet->id_bitmap)) {
|
|
entry = __lookup_addr_by_id(pernet, i);
|
|
if (!entry)
|
|
break;
|
|
|
|
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 void mptcp_pm_nl_fullmesh(struct mptcp_sock *msk,
|
|
struct mptcp_addr_info *addr)
|
|
{
|
|
struct mptcp_rm_list list = { .nr = 0 };
|
|
|
|
list.ids[list.nr++] = addr->id;
|
|
|
|
spin_lock_bh(&msk->pm.lock);
|
|
mptcp_pm_nl_rm_subflow_received(msk, &list);
|
|
mptcp_pm_create_subflow_or_signal_addr(msk);
|
|
spin_unlock_bh(&msk->pm.lock);
|
|
}
|
|
|
|
static int mptcp_nl_set_flags(struct net *net,
|
|
struct mptcp_addr_info *addr,
|
|
u8 bkup, u8 changed)
|
|
{
|
|
long s_slot = 0, s_num = 0;
|
|
struct mptcp_sock *msk;
|
|
int ret = -EINVAL;
|
|
|
|
while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
|
|
struct sock *sk = (struct sock *)msk;
|
|
|
|
if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk))
|
|
goto next;
|
|
|
|
lock_sock(sk);
|
|
if (changed & MPTCP_PM_ADDR_FLAG_BACKUP)
|
|
ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, NULL, bkup);
|
|
if (changed & MPTCP_PM_ADDR_FLAG_FULLMESH)
|
|
mptcp_pm_nl_fullmesh(msk, addr);
|
|
release_sock(sk);
|
|
|
|
next:
|
|
sock_put(sk);
|
|
cond_resched();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, }, *entry;
|
|
struct mptcp_pm_addr_entry remote = { .addr = { .family = AF_UNSPEC }, };
|
|
struct nlattr *attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
|
|
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
|
|
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
|
|
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
|
|
u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP |
|
|
MPTCP_PM_ADDR_FLAG_FULLMESH;
|
|
struct net *net = sock_net(skb->sk);
|
|
u8 bkup = 0, lookup_by_id = 0;
|
|
int ret;
|
|
|
|
ret = mptcp_pm_parse_entry(attr, info, false, &addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (attr_rem) {
|
|
ret = mptcp_pm_parse_entry(attr_rem, info, false, &remote);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
|
|
bkup = 1;
|
|
if (addr.addr.family == AF_UNSPEC) {
|
|
lookup_by_id = 1;
|
|
if (!addr.addr.id)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (token)
|
|
return mptcp_userspace_pm_set_flags(net, token, &addr, &remote, bkup);
|
|
|
|
spin_lock_bh(&pernet->lock);
|
|
entry = __lookup_addr(pernet, &addr.addr, lookup_by_id);
|
|
if (!entry) {
|
|
spin_unlock_bh(&pernet->lock);
|
|
return -EINVAL;
|
|
}
|
|
if ((addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) &&
|
|
(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
|
|
spin_unlock_bh(&pernet->lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
changed = (addr.flags ^ entry->flags) & mask;
|
|
entry->flags = (entry->flags & ~mask) | (addr.flags & mask);
|
|
addr = *entry;
|
|
spin_unlock_bh(&pernet->lock);
|
|
|
|
mptcp_nl_set_flags(net, &addr.addr, bkup, changed);
|
|
return 0;
|
|
}
|
|
|
|
static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp)
|
|
{
|
|
genlmsg_multicast_netns(&mptcp_genl_family, net,
|
|
nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp);
|
|
}
|
|
|
|
bool mptcp_userspace_pm_active(const struct mptcp_sock *msk)
|
|
{
|
|
return genl_has_listeners(&mptcp_genl_family,
|
|
sock_net((const struct sock *)msk),
|
|
MPTCP_PM_EV_GRP_OFFSET);
|
|
}
|
|
|
|
static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk)
|
|
{
|
|
const struct inet_sock *issk = inet_sk(ssk);
|
|
const struct mptcp_subflow_context *sf;
|
|
|
|
if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family))
|
|
return -EMSGSIZE;
|
|
|
|
switch (ssk->sk_family) {
|
|
case AF_INET:
|
|
if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr))
|
|
return -EMSGSIZE;
|
|
if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr))
|
|
return -EMSGSIZE;
|
|
break;
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
case AF_INET6: {
|
|
const struct ipv6_pinfo *np = inet6_sk(ssk);
|
|
|
|
if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr))
|
|
return -EMSGSIZE;
|
|
if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr))
|
|
return -EMSGSIZE;
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport))
|
|
return -EMSGSIZE;
|
|
if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport))
|
|
return -EMSGSIZE;
|
|
|
|
sf = mptcp_subflow_ctx(ssk);
|
|
if (WARN_ON_ONCE(!sf))
|
|
return -EINVAL;
|
|
|
|
if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, sf->local_id))
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mptcp_event_put_token_and_ssk(struct sk_buff *skb,
|
|
const struct mptcp_sock *msk,
|
|
const struct sock *ssk)
|
|
{
|
|
const struct sock *sk = (const struct sock *)msk;
|
|
const struct mptcp_subflow_context *sf;
|
|
u8 sk_err;
|
|
|
|
if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
|
|
return -EMSGSIZE;
|
|
|
|
if (mptcp_event_add_subflow(skb, ssk))
|
|
return -EMSGSIZE;
|
|
|
|
sf = mptcp_subflow_ctx(ssk);
|
|
if (WARN_ON_ONCE(!sf))
|
|
return -EINVAL;
|
|
|
|
if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup))
|
|
return -EMSGSIZE;
|
|
|
|
if (ssk->sk_bound_dev_if &&
|
|
nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if))
|
|
return -EMSGSIZE;
|
|
|
|
sk_err = ssk->sk_err;
|
|
if (sk_err && sk->sk_state == TCP_ESTABLISHED &&
|
|
nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mptcp_event_sub_established(struct sk_buff *skb,
|
|
const struct mptcp_sock *msk,
|
|
const struct sock *ssk)
|
|
{
|
|
return mptcp_event_put_token_and_ssk(skb, msk, ssk);
|
|
}
|
|
|
|
static int mptcp_event_sub_closed(struct sk_buff *skb,
|
|
const struct mptcp_sock *msk,
|
|
const struct sock *ssk)
|
|
{
|
|
const struct mptcp_subflow_context *sf;
|
|
|
|
if (mptcp_event_put_token_and_ssk(skb, msk, ssk))
|
|
return -EMSGSIZE;
|
|
|
|
sf = mptcp_subflow_ctx(ssk);
|
|
if (!sf->reset_seen)
|
|
return 0;
|
|
|
|
if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason))
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mptcp_event_created(struct sk_buff *skb,
|
|
const struct mptcp_sock *msk,
|
|
const struct sock *ssk)
|
|
{
|
|
int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
if (nla_put_u8(skb, MPTCP_ATTR_SERVER_SIDE, READ_ONCE(msk->pm.server_side)))
|
|
return -EMSGSIZE;
|
|
|
|
return mptcp_event_add_subflow(skb, ssk);
|
|
}
|
|
|
|
void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id)
|
|
{
|
|
struct net *net = sock_net((const struct sock *)msk);
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
|
|
if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED);
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id))
|
|
goto nla_put_failure;
|
|
|
|
genlmsg_end(skb, nlh);
|
|
mptcp_nl_mcast_send(net, skb, GFP_ATOMIC);
|
|
return;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(skb);
|
|
}
|
|
|
|
void mptcp_event_addr_announced(const struct sock *ssk,
|
|
const struct mptcp_addr_info *info)
|
|
{
|
|
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
|
|
struct mptcp_sock *msk = mptcp_sk(subflow->conn);
|
|
struct net *net = sock_net(ssk);
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
|
|
if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0,
|
|
MPTCP_EVENT_ANNOUNCED);
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be16(skb, MPTCP_ATTR_DPORT,
|
|
info->port == 0 ?
|
|
inet_sk(ssk)->inet_dport :
|
|
info->port))
|
|
goto nla_put_failure;
|
|
|
|
switch (info->family) {
|
|
case AF_INET:
|
|
if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr))
|
|
goto nla_put_failure;
|
|
break;
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
case AF_INET6:
|
|
if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6))
|
|
goto nla_put_failure;
|
|
break;
|
|
#endif
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
genlmsg_end(skb, nlh);
|
|
mptcp_nl_mcast_send(net, skb, GFP_ATOMIC);
|
|
return;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(skb);
|
|
}
|
|
|
|
void mptcp_event_pm_listener(const struct sock *ssk,
|
|
enum mptcp_event_type event)
|
|
{
|
|
const struct inet_sock *issk = inet_sk(ssk);
|
|
struct net *net = sock_net(ssk);
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
|
|
if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return;
|
|
|
|
nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, event);
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport))
|
|
goto nla_put_failure;
|
|
|
|
switch (ssk->sk_family) {
|
|
case AF_INET:
|
|
if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr))
|
|
goto nla_put_failure;
|
|
break;
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
case AF_INET6: {
|
|
const struct ipv6_pinfo *np = inet6_sk(ssk);
|
|
|
|
if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr))
|
|
goto nla_put_failure;
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
genlmsg_end(skb, nlh);
|
|
mptcp_nl_mcast_send(net, skb, GFP_KERNEL);
|
|
return;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(skb);
|
|
}
|
|
|
|
void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
|
|
const struct sock *ssk, gfp_t gfp)
|
|
{
|
|
struct net *net = sock_net((const struct sock *)msk);
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
|
|
if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
|
|
if (!skb)
|
|
return;
|
|
|
|
nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type);
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
switch (type) {
|
|
case MPTCP_EVENT_UNSPEC:
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
case MPTCP_EVENT_CREATED:
|
|
case MPTCP_EVENT_ESTABLISHED:
|
|
if (mptcp_event_created(skb, msk, ssk) < 0)
|
|
goto nla_put_failure;
|
|
break;
|
|
case MPTCP_EVENT_CLOSED:
|
|
if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0)
|
|
goto nla_put_failure;
|
|
break;
|
|
case MPTCP_EVENT_ANNOUNCED:
|
|
case MPTCP_EVENT_REMOVED:
|
|
/* call mptcp_event_addr_announced()/removed instead */
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
case MPTCP_EVENT_SUB_ESTABLISHED:
|
|
case MPTCP_EVENT_SUB_PRIORITY:
|
|
if (mptcp_event_sub_established(skb, msk, ssk) < 0)
|
|
goto nla_put_failure;
|
|
break;
|
|
case MPTCP_EVENT_SUB_CLOSED:
|
|
if (mptcp_event_sub_closed(skb, msk, ssk) < 0)
|
|
goto nla_put_failure;
|
|
break;
|
|
case MPTCP_EVENT_LISTENER_CREATED:
|
|
case MPTCP_EVENT_LISTENER_CLOSED:
|
|
break;
|
|
}
|
|
|
|
genlmsg_end(skb, nlh);
|
|
mptcp_nl_mcast_send(net, skb, gfp);
|
|
return;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(skb);
|
|
}
|
|
|
|
static const struct genl_small_ops mptcp_pm_ops[] = {
|
|
{
|
|
.cmd = MPTCP_PM_CMD_ADD_ADDR,
|
|
.doit = mptcp_nl_cmd_add_addr,
|
|
.flags = GENL_UNS_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_DEL_ADDR,
|
|
.doit = mptcp_nl_cmd_del_addr,
|
|
.flags = GENL_UNS_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_FLUSH_ADDRS,
|
|
.doit = mptcp_nl_cmd_flush_addrs,
|
|
.flags = GENL_UNS_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_UNS_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_GET_LIMITS,
|
|
.doit = mptcp_nl_cmd_get_limits,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_SET_FLAGS,
|
|
.doit = mptcp_nl_cmd_set_flags,
|
|
.flags = GENL_UNS_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_ANNOUNCE,
|
|
.doit = mptcp_nl_cmd_announce,
|
|
.flags = GENL_UNS_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_REMOVE,
|
|
.doit = mptcp_nl_cmd_remove,
|
|
.flags = GENL_UNS_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_SUBFLOW_CREATE,
|
|
.doit = mptcp_nl_cmd_sf_create,
|
|
.flags = GENL_UNS_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = MPTCP_PM_CMD_SUBFLOW_DESTROY,
|
|
.doit = mptcp_nl_cmd_sf_destroy,
|
|
.flags = GENL_UNS_ADMIN_PERM,
|
|
},
|
|
};
|
|
|
|
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,
|
|
.small_ops = mptcp_pm_ops,
|
|
.n_small_ops = ARRAY_SIZE(mptcp_pm_ops),
|
|
.resv_start_op = MPTCP_PM_CMD_SUBFLOW_DESTROY + 1,
|
|
.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 = pm_nl_get_pernet(net);
|
|
|
|
INIT_LIST_HEAD_RCU(&pernet->local_addr_list);
|
|
|
|
/* Cit. 2 subflows ought to be enough for anybody. */
|
|
pernet->subflows_max = 2;
|
|
pernet->next_id = 1;
|
|
pernet->stale_loss_cnt = 4;
|
|
spin_lock_init(&pernet->lock);
|
|
|
|
/* No need to initialize other pernet fields, the struct is zeroed at
|
|
* allocation time.
|
|
*/
|
|
|
|
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) {
|
|
struct pm_nl_pernet *pernet = pm_nl_get_pernet(net);
|
|
|
|
/* net is removed from namespace list, can't race with
|
|
* other modifiers, also netns core already waited for a
|
|
* RCU grace period.
|
|
*/
|
|
__flush_addrs(&pernet->local_addr_list);
|
|
}
|
|
}
|
|
|
|
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 __init 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");
|
|
}
|