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2095 lines
51 KiB
2095 lines
51 KiB
// 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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|
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#define pr_fmt(fmt) "MPTCP: " fmt |
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|
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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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|
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#include "protocol.h" |
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#include "mib.h" |
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|
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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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struct mptcp_addr_info addr; |
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u8 flags; |
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int ifindex; |
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struct socket *lsk; |
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}; |
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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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#define MAX_ADDR_ID 255 |
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#define BITMAP_SZ DIV_ROUND_UP(MAX_ADDR_ID + 1, BITS_PER_LONG) |
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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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unsigned long id_bitmap[BITMAP_SZ]; |
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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 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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|
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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 bool address_zero(const struct mptcp_addr_info *addr) |
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{ |
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struct mptcp_addr_info zero; |
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memset(&zero, 0, sizeof(zero)); |
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zero.family = addr->family; |
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return addresses_equal(addr, &zero, true); |
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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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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, 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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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 (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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struct mptcp_sock *msk) |
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{ |
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struct mptcp_pm_addr_entry *entry, *ret = NULL; |
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struct sock *sk = (struct sock *)msk; |
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|
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msk_owned_by_me(msk); |
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rcu_read_lock(); |
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__mptcp_flush_join_list(msk); |
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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 (entry->addr.family != sk->sk_family) { |
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#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
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if ((entry->addr.family == AF_INET && |
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!ipv6_addr_v4mapped(&sk->sk_v6_daddr)) || |
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(sk->sk_family == AF_INET && |
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!ipv6_addr_v4mapped(&entry->addr.addr6))) |
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#endif |
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continue; |
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} |
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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 (!lookup_subflow_by_saddr(&msk->conn_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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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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unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk) |
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{ |
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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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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(struct mptcp_sock *msk) |
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{ |
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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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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(struct mptcp_sock *msk) |
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{ |
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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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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(struct mptcp_sock *msk) |
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{ |
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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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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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static void check_work_pending(struct mptcp_sock *msk) |
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{ |
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if (msk->pm.add_addr_signaled == mptcp_pm_get_add_addr_signal_max(msk) && |
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(msk->pm.local_addr_used == mptcp_pm_get_local_addr_max(msk) || |
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msk->pm.subflows == mptcp_pm_get_subflows_max(msk))) |
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WRITE_ONCE(msk->pm.work_pending, false); |
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} |
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struct mptcp_pm_add_entry * |
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mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk, |
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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 (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 (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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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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static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, |
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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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if (mptcp_lookup_anno_list_by_saddr(msk, &entry->addr)) |
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return false; |
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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(struct mptcp_addr_info *addrs, unsigned int nr, |
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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 (addresses_equal(&addrs[i], addr, addr->port)) |
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return true; |
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} |
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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, bool fullmesh, |
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struct mptcp_addr_info *addrs) |
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{ |
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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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|
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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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remote_address((struct sock_common *)sk, &remote); |
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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, &remote); |
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if (!lookup_address_in_vec(addrs, i, &remote) && |
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msk->pm.subflows < subflows_max) { |
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msk->pm.subflows++; |
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addrs[i++] = remote; |
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} |
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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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|
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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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unsigned int add_addr_signal_max; |
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unsigned int local_addr_max; |
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struct pm_nl_pernet *pernet; |
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unsigned int subflows_max; |
|
|
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pernet = net_generic(sock_net(sk), pm_nl_pernet_id); |
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|
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add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk); |
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local_addr_max = mptcp_pm_get_local_addr_max(msk); |
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subflows_max = mptcp_pm_get_subflows_max(msk); |
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|
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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, local_addr_max, |
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msk->pm.add_addr_signaled, add_addr_signal_max, |
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msk->pm.subflows, subflows_max); |
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|
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/* check first for announce */ |
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if (msk->pm.add_addr_signaled < 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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if (mptcp_pm_alloc_anno_list(msk, local)) { |
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msk->pm.add_addr_signaled++; |
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mptcp_pm_announce_addr(msk, &local->addr, false); |
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mptcp_pm_nl_addr_send_ack(msk); |
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} |
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} else { |
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/* pick failed, avoid fourther attempts later */ |
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msk->pm.local_addr_used = 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 < local_addr_max && |
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msk->pm.subflows < subflows_max && |
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!READ_ONCE(msk->pm.remote_deny_join_id0)) { |
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local = select_local_address(pernet, msk); |
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if (local) { |
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bool fullmesh = !!(local->flags & MPTCP_PM_ADDR_FLAG_FULLMESH); |
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struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX]; |
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int i, nr; |
|
|
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msk->pm.local_addr_used++; |
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check_work_pending(msk); |
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nr = fill_remote_addresses_vec(msk, fullmesh, addrs); |
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spin_unlock_bh(&msk->pm.lock); |
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for (i = 0; i < nr; i++) |
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__mptcp_subflow_connect(sk, &local->addr, &addrs[i]); |
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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 = local_addr_max; |
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check_work_pending(msk); |
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} |
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} |
|
|
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static 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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static 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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/* Fill all the local addresses into the array addrs[], |
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* and return the array size. |
|
*/ |
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static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk, |
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struct mptcp_addr_info *addrs) |
|
{ |
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struct sock *sk = (struct sock *)msk; |
|
struct mptcp_pm_addr_entry *entry; |
|
struct mptcp_addr_info local; |
|
struct pm_nl_pernet *pernet; |
|
unsigned int subflows_max; |
|
int i = 0; |
|
|
|
pernet = net_generic(sock_net(sk), pm_nl_pernet_id); |
|
subflows_max = mptcp_pm_get_subflows_max(msk); |
|
|
|
rcu_read_lock(); |
|
__mptcp_flush_join_list(msk); |
|
list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { |
|
if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH)) |
|
continue; |
|
|
|
if (entry->addr.family != sk->sk_family) { |
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
|
if ((entry->addr.family == AF_INET && |
|
!ipv6_addr_v4mapped(&sk->sk_v6_daddr)) || |
|
(sk->sk_family == AF_INET && |
|
!ipv6_addr_v4mapped(&entry->addr.addr6))) |
|
#endif |
|
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) { |
|
memset(&local, 0, sizeof(local)); |
|
local.family = msk->pm.remote.family; |
|
|
|
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); |
|
|
|
if (lookup_subflow_by_daddr(&msk->conn_list, &msk->pm.remote)) |
|
goto add_addr_echo; |
|
|
|
/* connect to the specified remote address, using whatever |
|
* local address the routing configuration will pick. |
|
*/ |
|
remote = msk->pm.remote; |
|
if (!remote.port) |
|
remote.port = sk->sk_dport; |
|
nr = fill_local_addresses_vec(msk, addrs); |
|
|
|
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); |
|
|
|
add_addr_echo: |
|
mptcp_pm_announce_addr(msk, &msk->pm.remote, true); |
|
mptcp_pm_nl_addr_send_ack(msk); |
|
} |
|
|
|
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; |
|
|
|
__mptcp_flush_join_list(msk); |
|
subflow = list_first_entry_or_null(&msk->conn_list, typeof(*subflow), node); |
|
if (subflow) { |
|
struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
|
|
|
spin_unlock_bh(&msk->pm.lock); |
|
pr_debug("send ack for %s", |
|
mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr"); |
|
|
|
mptcp_subflow_send_ack(ssk); |
|
spin_lock_bh(&msk->pm.lock); |
|
} |
|
} |
|
|
|
int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, |
|
struct mptcp_addr_info *addr, |
|
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 sock *sk = (struct sock *)msk; |
|
struct mptcp_addr_info local; |
|
|
|
local_address((struct sock_common *)ssk, &local); |
|
if (!addresses_equal(&local, addr, addr->port)) |
|
continue; |
|
|
|
subflow->backup = bkup; |
|
subflow->send_mp_prio = 1; |
|
subflow->request_bkup = bkup; |
|
__MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIOTX); |
|
|
|
spin_unlock_bh(&msk->pm.lock); |
|
pr_debug("send ack for mp_prio"); |
|
mptcp_subflow_send_ack(ssk); |
|
spin_lock_bh(&msk->pm.lock); |
|
|
|
return 0; |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
|
|
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 (!rm_list->nr) |
|
return; |
|
|
|
if (list_empty(&msk->conn_list)) |
|
return; |
|
|
|
for (i = 0; i < rm_list->nr; i++) { |
|
list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { |
|
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) |
|
id = subflow->remote_id; |
|
|
|
if (rm_list->ids[i] != id) |
|
continue; |
|
|
|
pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u", |
|
rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", |
|
i, rm_list->ids[i], subflow->local_id, subflow->remote_id); |
|
spin_unlock_bh(&msk->pm.lock); |
|
mptcp_subflow_shutdown(sk, ssk, how); |
|
mptcp_close_ssk(sk, ssk, subflow); |
|
spin_lock_bh(&msk->pm.lock); |
|
|
|
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--; |
|
} |
|
msk->pm.subflows--; |
|
__MPTCP_INC_STATS(sock_net(sk), rm_type); |
|
} |
|
} |
|
} |
|
|
|
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); |
|
|
|
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; |
|
} |
|
|
|
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; |
|
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 == MAX_ADDR_ID) |
|
pernet->next_id = 1; |
|
if (pernet->addrs >= MPTCP_PM_ADDR_MAX) |
|
goto out; |
|
if (test_bit(entry->addr.id, pernet->id_bitmap)) |
|
goto out; |
|
|
|
/* do not insert duplicate address, differentiate on port only |
|
* singled addresses |
|
*/ |
|
list_for_each_entry(cur, &pernet->local_addr_list, list) { |
|
if (addresses_equal(&cur->addr, &entry->addr, |
|
address_use_port(entry) && |
|
address_use_port(cur))) |
|
goto out; |
|
} |
|
|
|
if (!entry->addr.id) { |
|
find_next: |
|
entry->addr.id = find_next_zero_bit(pernet->id_bitmap, |
|
MAX_ADDR_ID + 1, |
|
pernet->next_id); |
|
if ((!entry->addr.id || entry->addr.id > MAX_ADDR_ID) && |
|
pernet->next_id != 1) { |
|
pernet->next_id = 1; |
|
goto find_next; |
|
} |
|
} |
|
|
|
if (!entry->addr.id || entry->addr.id > MAX_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++; |
|
list_add_tail_rcu(&entry->list, &pernet->local_addr_list); |
|
ret = entry->addr.id; |
|
|
|
out: |
|
spin_unlock_bh(&pernet->lock); |
|
return ret; |
|
} |
|
|
|
static int mptcp_pm_nl_create_listen_socket(struct sock *sk, |
|
struct mptcp_pm_addr_entry *entry) |
|
{ |
|
struct sockaddr_storage addr; |
|
struct mptcp_sock *msk; |
|
struct socket *ssock; |
|
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; |
|
|
|
msk = mptcp_sk(entry->lsk->sk); |
|
if (!msk) { |
|
err = -EINVAL; |
|
goto out; |
|
} |
|
|
|
ssock = __mptcp_nmpc_socket(msk); |
|
if (!ssock) { |
|
err = -EINVAL; |
|
goto out; |
|
} |
|
|
|
mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family); |
|
err = kernel_bind(ssock, (struct sockaddr *)&addr, |
|
sizeof(struct sockaddr_in)); |
|
if (err) { |
|
pr_warn("kernel_bind error, err=%d", err); |
|
goto out; |
|
} |
|
|
|
err = kernel_listen(ssock, backlog); |
|
if (err) { |
|
pr_warn("kernel_listen error, err=%d", err); |
|
goto out; |
|
} |
|
|
|
return 0; |
|
|
|
out: |
|
sock_release(entry->lsk); |
|
return err; |
|
} |
|
|
|
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 (addresses_equal(&msk_local, &skc_local, false)) |
|
return 0; |
|
|
|
if (address_zero(&skc_local)) |
|
return 0; |
|
|
|
pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { |
|
if (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 = 0; |
|
entry->lsk = NULL; |
|
ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); |
|
if (ret < 0) |
|
kfree(entry); |
|
|
|
return ret; |
|
} |
|
|
|
void mptcp_pm_nl_data_init(struct mptcp_sock *msk) |
|
{ |
|
struct mptcp_pm_data *pm = &msk->pm; |
|
bool subflows; |
|
|
|
subflows = !!mptcp_pm_get_subflows_max(msk); |
|
WRITE_ONCE(pm->work_pending, (!!mptcp_pm_get_local_addr_max(msk) && subflows) || |
|
!!mptcp_pm_get_add_addr_signal_max(msk)); |
|
WRITE_ONCE(pm->accept_addr, !!mptcp_pm_get_add_addr_accept_max(msk) && subflows); |
|
WRITE_ONCE(pm->accept_subflow, subflows); |
|
} |
|
|
|
#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, }, |
|
}; |
|
|
|
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(sock_net(sk), MPTCP_MIB_SUBFLOWSTALE); |
|
} |
|
unlock_sock_fast(ssk, slow); |
|
|
|
/* always try to push the pending data regarless 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_addr(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, 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; |
|
|
|
memset(entry, 0, sizeof(*entry)); |
|
if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) { |
|
if (!require_family) |
|
goto skip_family; |
|
|
|
NL_SET_ERR_MSG_ATTR(info->extack, attr, |
|
"missing family"); |
|
return -EINVAL; |
|
} |
|
|
|
entry->addr.family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]); |
|
if (entry->addr.family != AF_INET |
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
|
&& entry->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(entry->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 (entry->addr.family == AF_INET6) |
|
entry->addr.addr6 = nla_get_in6_addr(tb[addr_addr]); |
|
else |
|
#endif |
|
entry->addr.addr.s_addr = nla_get_in_addr(tb[addr_addr]); |
|
|
|
skip_family: |
|
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_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]); |
|
|
|
if (tb[MPTCP_PM_ADDR_ATTR_PORT]) { |
|
if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { |
|
NL_SET_ERR_MSG_ATTR(info->extack, attr, |
|
"flags must have signal when using port"); |
|
return -EINVAL; |
|
} |
|
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 net_generic(genl_info_net(info), pm_nl_pernet_id); |
|
} |
|
|
|
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)) |
|
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_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; |
|
if (entry->addr.port) { |
|
ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry); |
|
if (ret) { |
|
GENL_SET_ERR_MSG(info, "create listen socket error"); |
|
kfree(entry); |
|
return ret; |
|
} |
|
} |
|
ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); |
|
if (ret < 0) { |
|
GENL_SET_ERR_MSG(info, "too many addresses or duplicate one"); |
|
if (entry->lsk) |
|
sock_release(entry->lsk); |
|
kfree(entry); |
|
return ret; |
|
} |
|
|
|
mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk)); |
|
|
|
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; |
|
} |
|
|
|
int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id, |
|
u8 *flags, int *ifindex) |
|
{ |
|
struct mptcp_pm_addr_entry *entry; |
|
|
|
*flags = 0; |
|
*ifindex = 0; |
|
|
|
if (id) { |
|
rcu_read_lock(); |
|
entry = __lookup_addr_by_id(net_generic(net, pm_nl_pernet_id), 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, |
|
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, |
|
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, |
|
struct mptcp_addr_info *addr) |
|
{ |
|
struct mptcp_sock *msk; |
|
long s_slot = 0, s_num = 0; |
|
struct mptcp_rm_list list = { .nr = 0 }; |
|
|
|
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 (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); |
|
if (remove_subflow) |
|
mptcp_pm_remove_subflow(msk, &list); |
|
release_sock(sk); |
|
|
|
next: |
|
sock_put(sk); |
|
cond_resched(); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* 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_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)) |
|
goto next; |
|
|
|
local_address((struct sock_common *)msk, &msk_local); |
|
if (!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_addr(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->addr); |
|
synchronize_rcu(); |
|
__mptcp_pm_release_addr_entry(entry); |
|
|
|
return ret; |
|
} |
|
|
|
static 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) && |
|
alist.nr < MPTCP_RM_IDS_MAX && |
|
slist.nr < MPTCP_RM_IDS_MAX) { |
|
alist.ids[alist.nr++] = entry->addr.id; |
|
slist.ids[slist.nr++] = entry->addr.id; |
|
} else 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; |
|
|
|
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, 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_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; |
|
int i; |
|
|
|
pernet = net_generic(net, pm_nl_pernet_id); |
|
|
|
spin_lock_bh(&pernet->lock); |
|
for (i = id; i < 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 int mptcp_nl_addr_backup(struct net *net, |
|
struct mptcp_addr_info *addr, |
|
u8 bkup) |
|
{ |
|
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)) |
|
goto next; |
|
|
|
lock_sock(sk); |
|
spin_lock_bh(&msk->pm.lock); |
|
ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, bkup); |
|
spin_unlock_bh(&msk->pm.lock); |
|
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 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 net *net = sock_net(skb->sk); |
|
u8 bkup = 0; |
|
int ret; |
|
|
|
ret = mptcp_pm_parse_addr(attr, info, true, &addr); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP) |
|
bkup = 1; |
|
|
|
list_for_each_entry(entry, &pernet->local_addr_list, list) { |
|
if (addresses_equal(&entry->addr, &addr.addr, true)) { |
|
mptcp_nl_addr_backup(net, &entry->addr, bkup); |
|
|
|
if (bkup) |
|
entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP; |
|
else |
|
entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP; |
|
} |
|
} |
|
|
|
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); |
|
} |
|
|
|
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; |
|
|
|
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: |
|
kfree_skb(skb); |
|
} |
|
|
|
void mptcp_event_addr_announced(const struct mptcp_sock *msk, |
|
const struct mptcp_addr_info *info) |
|
{ |
|
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_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)) |
|
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: |
|
kfree_skb(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; |
|
} |
|
|
|
genlmsg_end(skb, nlh); |
|
mptcp_nl_mcast_send(net, skb, gfp); |
|
return; |
|
|
|
nla_put_failure: |
|
kfree_skb(skb); |
|
} |
|
|
|
static const struct genl_small_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, |
|
}, |
|
{ |
|
.cmd = MPTCP_PM_CMD_SET_FLAGS, |
|
.doit = mptcp_nl_cmd_set_flags, |
|
.flags = GENL_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), |
|
.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); |
|
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 = net_generic(net, pm_nl_pernet_id); |
|
|
|
/* 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"); |
|
}
|
|
|