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209 lines
4.4 KiB
209 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Multipath TCP |
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* |
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* Copyright (c) 2019, Tessares SA. |
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*/ |
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#ifdef CONFIG_SYSCTL |
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#include <linux/sysctl.h> |
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#endif |
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#include <net/net_namespace.h> |
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#include <net/netns/generic.h> |
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#include "protocol.h" |
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#define MPTCP_SYSCTL_PATH "net/mptcp" |
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static int mptcp_pernet_id; |
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struct mptcp_pernet { |
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#ifdef CONFIG_SYSCTL |
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struct ctl_table_header *ctl_table_hdr; |
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#endif |
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unsigned int add_addr_timeout; |
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unsigned int stale_loss_cnt; |
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u8 mptcp_enabled; |
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u8 checksum_enabled; |
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u8 allow_join_initial_addr_port; |
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}; |
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static struct mptcp_pernet *mptcp_get_pernet(const struct net *net) |
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{ |
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return net_generic(net, mptcp_pernet_id); |
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} |
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int mptcp_is_enabled(const struct net *net) |
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{ |
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return mptcp_get_pernet(net)->mptcp_enabled; |
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} |
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unsigned int mptcp_get_add_addr_timeout(const struct net *net) |
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{ |
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return mptcp_get_pernet(net)->add_addr_timeout; |
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} |
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int mptcp_is_checksum_enabled(const struct net *net) |
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{ |
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return mptcp_get_pernet(net)->checksum_enabled; |
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} |
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int mptcp_allow_join_id0(const struct net *net) |
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{ |
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return mptcp_get_pernet(net)->allow_join_initial_addr_port; |
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} |
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unsigned int mptcp_stale_loss_cnt(const struct net *net) |
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{ |
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return mptcp_get_pernet(net)->stale_loss_cnt; |
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} |
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static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet) |
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{ |
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pernet->mptcp_enabled = 1; |
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pernet->add_addr_timeout = TCP_RTO_MAX; |
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pernet->checksum_enabled = 0; |
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pernet->allow_join_initial_addr_port = 1; |
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pernet->stale_loss_cnt = 4; |
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} |
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#ifdef CONFIG_SYSCTL |
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static struct ctl_table mptcp_sysctl_table[] = { |
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{ |
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.procname = "enabled", |
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.maxlen = sizeof(u8), |
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.mode = 0644, |
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/* users with CAP_NET_ADMIN or root (not and) can change this |
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* value, same as other sysctl or the 'net' tree. |
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*/ |
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.proc_handler = proc_dou8vec_minmax, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_ONE |
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}, |
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{ |
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.procname = "add_addr_timeout", |
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.maxlen = sizeof(unsigned int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec_jiffies, |
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}, |
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{ |
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.procname = "checksum_enabled", |
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.maxlen = sizeof(u8), |
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.mode = 0644, |
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.proc_handler = proc_dou8vec_minmax, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_ONE |
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}, |
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{ |
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.procname = "allow_join_initial_addr_port", |
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.maxlen = sizeof(u8), |
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.mode = 0644, |
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.proc_handler = proc_dou8vec_minmax, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_ONE |
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}, |
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{ |
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.procname = "stale_loss_cnt", |
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.maxlen = sizeof(unsigned int), |
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.mode = 0644, |
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.proc_handler = proc_douintvec_minmax, |
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}, |
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{} |
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}; |
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static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) |
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{ |
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struct ctl_table_header *hdr; |
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struct ctl_table *table; |
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table = mptcp_sysctl_table; |
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if (!net_eq(net, &init_net)) { |
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table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL); |
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if (!table) |
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goto err_alloc; |
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} |
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table[0].data = &pernet->mptcp_enabled; |
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table[1].data = &pernet->add_addr_timeout; |
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table[2].data = &pernet->checksum_enabled; |
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table[3].data = &pernet->allow_join_initial_addr_port; |
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table[4].data = &pernet->stale_loss_cnt; |
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hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table); |
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if (!hdr) |
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goto err_reg; |
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pernet->ctl_table_hdr = hdr; |
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return 0; |
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err_reg: |
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if (!net_eq(net, &init_net)) |
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kfree(table); |
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err_alloc: |
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return -ENOMEM; |
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} |
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static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) |
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{ |
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struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg; |
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unregister_net_sysctl_table(pernet->ctl_table_hdr); |
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kfree(table); |
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} |
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#else |
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static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) |
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{ |
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return 0; |
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} |
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static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {} |
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#endif /* CONFIG_SYSCTL */ |
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static int __net_init mptcp_net_init(struct net *net) |
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{ |
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struct mptcp_pernet *pernet = mptcp_get_pernet(net); |
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mptcp_pernet_set_defaults(pernet); |
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return mptcp_pernet_new_table(net, pernet); |
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} |
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/* Note: the callback will only be called per extra netns */ |
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static void __net_exit mptcp_net_exit(struct net *net) |
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{ |
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struct mptcp_pernet *pernet = mptcp_get_pernet(net); |
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mptcp_pernet_del_table(pernet); |
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} |
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static struct pernet_operations mptcp_pernet_ops = { |
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.init = mptcp_net_init, |
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.exit = mptcp_net_exit, |
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.id = &mptcp_pernet_id, |
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.size = sizeof(struct mptcp_pernet), |
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}; |
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void __init mptcp_init(void) |
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{ |
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mptcp_join_cookie_init(); |
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mptcp_proto_init(); |
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if (register_pernet_subsys(&mptcp_pernet_ops) < 0) |
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panic("Failed to register MPTCP pernet subsystem.\n"); |
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} |
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#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
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int __init mptcpv6_init(void) |
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{ |
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int err; |
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err = mptcp_proto_v6_init(); |
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return err; |
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} |
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#endif
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