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