cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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net_namespace.h (13096B)


      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Operations on the network namespace
      4 */
      5#ifndef __NET_NET_NAMESPACE_H
      6#define __NET_NET_NAMESPACE_H
      7
      8#include <linux/atomic.h>
      9#include <linux/refcount.h>
     10#include <linux/workqueue.h>
     11#include <linux/list.h>
     12#include <linux/sysctl.h>
     13#include <linux/uidgid.h>
     14
     15#include <net/flow.h>
     16#include <net/netns/core.h>
     17#include <net/netns/mib.h>
     18#include <net/netns/unix.h>
     19#include <net/netns/packet.h>
     20#include <net/netns/ipv4.h>
     21#include <net/netns/ipv6.h>
     22#include <net/netns/nexthop.h>
     23#include <net/netns/ieee802154_6lowpan.h>
     24#include <net/netns/sctp.h>
     25#include <net/netns/netfilter.h>
     26#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
     27#include <net/netns/conntrack.h>
     28#endif
     29#include <net/netns/nftables.h>
     30#include <net/netns/xfrm.h>
     31#include <net/netns/mpls.h>
     32#include <net/netns/can.h>
     33#include <net/netns/xdp.h>
     34#include <net/netns/smc.h>
     35#include <net/netns/bpf.h>
     36#include <net/netns/mctp.h>
     37#include <net/net_trackers.h>
     38#include <linux/ns_common.h>
     39#include <linux/idr.h>
     40#include <linux/skbuff.h>
     41#include <linux/notifier.h>
     42
     43struct user_namespace;
     44struct proc_dir_entry;
     45struct net_device;
     46struct sock;
     47struct ctl_table_header;
     48struct net_generic;
     49struct uevent_sock;
     50struct netns_ipvs;
     51struct bpf_prog;
     52
     53
     54#define NETDEV_HASHBITS    8
     55#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
     56
     57struct net {
     58	/* First cache line can be often dirtied.
     59	 * Do not place here read-mostly fields.
     60	 */
     61	refcount_t		passive;	/* To decide when the network
     62						 * namespace should be freed.
     63						 */
     64	spinlock_t		rules_mod_lock;
     65
     66	atomic_t		dev_unreg_count;
     67
     68	unsigned int		dev_base_seq;	/* protected by rtnl_mutex */
     69	int			ifindex;
     70
     71	spinlock_t		nsid_lock;
     72	atomic_t		fnhe_genid;
     73
     74	struct list_head	list;		/* list of network namespaces */
     75	struct list_head	exit_list;	/* To linked to call pernet exit
     76						 * methods on dead net (
     77						 * pernet_ops_rwsem read locked),
     78						 * or to unregister pernet ops
     79						 * (pernet_ops_rwsem write locked).
     80						 */
     81	struct llist_node	cleanup_list;	/* namespaces on death row */
     82
     83#ifdef CONFIG_KEYS
     84	struct key_tag		*key_domain;	/* Key domain of operation tag */
     85#endif
     86	struct user_namespace   *user_ns;	/* Owning user namespace */
     87	struct ucounts		*ucounts;
     88	struct idr		netns_ids;
     89
     90	struct ns_common	ns;
     91	struct ref_tracker_dir  refcnt_tracker;
     92
     93	struct list_head 	dev_base_head;
     94	struct proc_dir_entry 	*proc_net;
     95	struct proc_dir_entry 	*proc_net_stat;
     96
     97#ifdef CONFIG_SYSCTL
     98	struct ctl_table_set	sysctls;
     99#endif
    100
    101	struct sock 		*rtnl;			/* rtnetlink socket */
    102	struct sock		*genl_sock;
    103
    104	struct uevent_sock	*uevent_sock;		/* uevent socket */
    105
    106	struct hlist_head 	*dev_name_head;
    107	struct hlist_head	*dev_index_head;
    108	struct raw_notifier_head	netdev_chain;
    109
    110	/* Note that @hash_mix can be read millions times per second,
    111	 * it is critical that it is on a read_mostly cache line.
    112	 */
    113	u32			hash_mix;
    114
    115	struct net_device       *loopback_dev;          /* The loopback */
    116
    117	/* core fib_rules */
    118	struct list_head	rules_ops;
    119
    120	struct netns_core	core;
    121	struct netns_mib	mib;
    122	struct netns_packet	packet;
    123	struct netns_unix	unx;
    124	struct netns_nexthop	nexthop;
    125	struct netns_ipv4	ipv4;
    126#if IS_ENABLED(CONFIG_IPV6)
    127	struct netns_ipv6	ipv6;
    128#endif
    129#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
    130	struct netns_ieee802154_lowpan	ieee802154_lowpan;
    131#endif
    132#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
    133	struct netns_sctp	sctp;
    134#endif
    135#ifdef CONFIG_NETFILTER
    136	struct netns_nf		nf;
    137#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
    138	struct netns_ct		ct;
    139#endif
    140#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
    141	struct netns_nftables	nft;
    142#endif
    143#endif
    144#ifdef CONFIG_WEXT_CORE
    145	struct sk_buff_head	wext_nlevents;
    146#endif
    147	struct net_generic __rcu	*gen;
    148
    149	/* Used to store attached BPF programs */
    150	struct netns_bpf	bpf;
    151
    152	/* Note : following structs are cache line aligned */
    153#ifdef CONFIG_XFRM
    154	struct netns_xfrm	xfrm;
    155#endif
    156
    157	u64			net_cookie; /* written once */
    158
    159#if IS_ENABLED(CONFIG_IP_VS)
    160	struct netns_ipvs	*ipvs;
    161#endif
    162#if IS_ENABLED(CONFIG_MPLS)
    163	struct netns_mpls	mpls;
    164#endif
    165#if IS_ENABLED(CONFIG_CAN)
    166	struct netns_can	can;
    167#endif
    168#ifdef CONFIG_XDP_SOCKETS
    169	struct netns_xdp	xdp;
    170#endif
    171#if IS_ENABLED(CONFIG_MCTP)
    172	struct netns_mctp	mctp;
    173#endif
    174#if IS_ENABLED(CONFIG_CRYPTO_USER)
    175	struct sock		*crypto_nlsk;
    176#endif
    177	struct sock		*diag_nlsk;
    178#if IS_ENABLED(CONFIG_SMC)
    179	struct netns_smc	smc;
    180#endif
    181} __randomize_layout;
    182
    183#include <linux/seq_file_net.h>
    184
    185/* Init's network namespace */
    186extern struct net init_net;
    187
    188#ifdef CONFIG_NET_NS
    189struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
    190			struct net *old_net);
    191
    192void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
    193
    194void net_ns_barrier(void);
    195
    196struct ns_common *get_net_ns(struct ns_common *ns);
    197struct net *get_net_ns_by_fd(int fd);
    198#else /* CONFIG_NET_NS */
    199#include <linux/sched.h>
    200#include <linux/nsproxy.h>
    201static inline struct net *copy_net_ns(unsigned long flags,
    202	struct user_namespace *user_ns, struct net *old_net)
    203{
    204	if (flags & CLONE_NEWNET)
    205		return ERR_PTR(-EINVAL);
    206	return old_net;
    207}
    208
    209static inline void net_ns_get_ownership(const struct net *net,
    210					kuid_t *uid, kgid_t *gid)
    211{
    212	*uid = GLOBAL_ROOT_UID;
    213	*gid = GLOBAL_ROOT_GID;
    214}
    215
    216static inline void net_ns_barrier(void) {}
    217
    218static inline struct ns_common *get_net_ns(struct ns_common *ns)
    219{
    220	return ERR_PTR(-EINVAL);
    221}
    222
    223static inline struct net *get_net_ns_by_fd(int fd)
    224{
    225	return ERR_PTR(-EINVAL);
    226}
    227#endif /* CONFIG_NET_NS */
    228
    229
    230extern struct list_head net_namespace_list;
    231
    232struct net *get_net_ns_by_pid(pid_t pid);
    233
    234#ifdef CONFIG_SYSCTL
    235void ipx_register_sysctl(void);
    236void ipx_unregister_sysctl(void);
    237#else
    238#define ipx_register_sysctl()
    239#define ipx_unregister_sysctl()
    240#endif
    241
    242#ifdef CONFIG_NET_NS
    243void __put_net(struct net *net);
    244
    245/* Try using get_net_track() instead */
    246static inline struct net *get_net(struct net *net)
    247{
    248	refcount_inc(&net->ns.count);
    249	return net;
    250}
    251
    252static inline struct net *maybe_get_net(struct net *net)
    253{
    254	/* Used when we know struct net exists but we
    255	 * aren't guaranteed a previous reference count
    256	 * exists.  If the reference count is zero this
    257	 * function fails and returns NULL.
    258	 */
    259	if (!refcount_inc_not_zero(&net->ns.count))
    260		net = NULL;
    261	return net;
    262}
    263
    264/* Try using put_net_track() instead */
    265static inline void put_net(struct net *net)
    266{
    267	if (refcount_dec_and_test(&net->ns.count))
    268		__put_net(net);
    269}
    270
    271static inline
    272int net_eq(const struct net *net1, const struct net *net2)
    273{
    274	return net1 == net2;
    275}
    276
    277static inline int check_net(const struct net *net)
    278{
    279	return refcount_read(&net->ns.count) != 0;
    280}
    281
    282void net_drop_ns(void *);
    283
    284#else
    285
    286static inline struct net *get_net(struct net *net)
    287{
    288	return net;
    289}
    290
    291static inline void put_net(struct net *net)
    292{
    293}
    294
    295static inline struct net *maybe_get_net(struct net *net)
    296{
    297	return net;
    298}
    299
    300static inline
    301int net_eq(const struct net *net1, const struct net *net2)
    302{
    303	return 1;
    304}
    305
    306static inline int check_net(const struct net *net)
    307{
    308	return 1;
    309}
    310
    311#define net_drop_ns NULL
    312#endif
    313
    314
    315static inline void netns_tracker_alloc(struct net *net,
    316				       netns_tracker *tracker, gfp_t gfp)
    317{
    318#ifdef CONFIG_NET_NS_REFCNT_TRACKER
    319	ref_tracker_alloc(&net->refcnt_tracker, tracker, gfp);
    320#endif
    321}
    322
    323static inline void netns_tracker_free(struct net *net,
    324				      netns_tracker *tracker)
    325{
    326#ifdef CONFIG_NET_NS_REFCNT_TRACKER
    327       ref_tracker_free(&net->refcnt_tracker, tracker);
    328#endif
    329}
    330
    331static inline struct net *get_net_track(struct net *net,
    332					netns_tracker *tracker, gfp_t gfp)
    333{
    334	get_net(net);
    335	netns_tracker_alloc(net, tracker, gfp);
    336	return net;
    337}
    338
    339static inline void put_net_track(struct net *net, netns_tracker *tracker)
    340{
    341	netns_tracker_free(net, tracker);
    342	put_net(net);
    343}
    344
    345typedef struct {
    346#ifdef CONFIG_NET_NS
    347	struct net *net;
    348#endif
    349} possible_net_t;
    350
    351static inline void write_pnet(possible_net_t *pnet, struct net *net)
    352{
    353#ifdef CONFIG_NET_NS
    354	pnet->net = net;
    355#endif
    356}
    357
    358static inline struct net *read_pnet(const possible_net_t *pnet)
    359{
    360#ifdef CONFIG_NET_NS
    361	return pnet->net;
    362#else
    363	return &init_net;
    364#endif
    365}
    366
    367/* Protected by net_rwsem */
    368#define for_each_net(VAR)				\
    369	list_for_each_entry(VAR, &net_namespace_list, list)
    370#define for_each_net_continue_reverse(VAR)		\
    371	list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list)
    372#define for_each_net_rcu(VAR)				\
    373	list_for_each_entry_rcu(VAR, &net_namespace_list, list)
    374
    375#ifdef CONFIG_NET_NS
    376#define __net_init
    377#define __net_exit
    378#define __net_initdata
    379#define __net_initconst
    380#else
    381#define __net_init	__init
    382#define __net_exit	__ref
    383#define __net_initdata	__initdata
    384#define __net_initconst	__initconst
    385#endif
    386
    387int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp);
    388int peernet2id(const struct net *net, struct net *peer);
    389bool peernet_has_id(const struct net *net, struct net *peer);
    390struct net *get_net_ns_by_id(const struct net *net, int id);
    391
    392struct pernet_operations {
    393	struct list_head list;
    394	/*
    395	 * Below methods are called without any exclusive locks.
    396	 * More than one net may be constructed and destructed
    397	 * in parallel on several cpus. Every pernet_operations
    398	 * have to keep in mind all other pernet_operations and
    399	 * to introduce a locking, if they share common resources.
    400	 *
    401	 * The only time they are called with exclusive lock is
    402	 * from register_pernet_subsys(), unregister_pernet_subsys()
    403	 * register_pernet_device() and unregister_pernet_device().
    404	 *
    405	 * Exit methods using blocking RCU primitives, such as
    406	 * synchronize_rcu(), should be implemented via exit_batch.
    407	 * Then, destruction of a group of net requires single
    408	 * synchronize_rcu() related to these pernet_operations,
    409	 * instead of separate synchronize_rcu() for every net.
    410	 * Please, avoid synchronize_rcu() at all, where it's possible.
    411	 *
    412	 * Note that a combination of pre_exit() and exit() can
    413	 * be used, since a synchronize_rcu() is guaranteed between
    414	 * the calls.
    415	 */
    416	int (*init)(struct net *net);
    417	void (*pre_exit)(struct net *net);
    418	void (*exit)(struct net *net);
    419	void (*exit_batch)(struct list_head *net_exit_list);
    420	unsigned int *id;
    421	size_t size;
    422};
    423
    424/*
    425 * Use these carefully.  If you implement a network device and it
    426 * needs per network namespace operations use device pernet operations,
    427 * otherwise use pernet subsys operations.
    428 *
    429 * Network interfaces need to be removed from a dying netns _before_
    430 * subsys notifiers can be called, as most of the network code cleanup
    431 * (which is done from subsys notifiers) runs with the assumption that
    432 * dev_remove_pack has been called so no new packets will arrive during
    433 * and after the cleanup functions have been called.  dev_remove_pack
    434 * is not per namespace so instead the guarantee of no more packets
    435 * arriving in a network namespace is provided by ensuring that all
    436 * network devices and all sockets have left the network namespace
    437 * before the cleanup methods are called.
    438 *
    439 * For the longest time the ipv4 icmp code was registered as a pernet
    440 * device which caused kernel oops, and panics during network
    441 * namespace cleanup.   So please don't get this wrong.
    442 */
    443int register_pernet_subsys(struct pernet_operations *);
    444void unregister_pernet_subsys(struct pernet_operations *);
    445int register_pernet_device(struct pernet_operations *);
    446void unregister_pernet_device(struct pernet_operations *);
    447
    448struct ctl_table;
    449
    450#ifdef CONFIG_SYSCTL
    451int net_sysctl_init(void);
    452struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
    453					     struct ctl_table *table);
    454void unregister_net_sysctl_table(struct ctl_table_header *header);
    455#else
    456static inline int net_sysctl_init(void) { return 0; }
    457static inline struct ctl_table_header *register_net_sysctl(struct net *net,
    458	const char *path, struct ctl_table *table)
    459{
    460	return NULL;
    461}
    462static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
    463{
    464}
    465#endif
    466
    467static inline int rt_genid_ipv4(const struct net *net)
    468{
    469	return atomic_read(&net->ipv4.rt_genid);
    470}
    471
    472#if IS_ENABLED(CONFIG_IPV6)
    473static inline int rt_genid_ipv6(const struct net *net)
    474{
    475	return atomic_read(&net->ipv6.fib6_sernum);
    476}
    477#endif
    478
    479static inline void rt_genid_bump_ipv4(struct net *net)
    480{
    481	atomic_inc(&net->ipv4.rt_genid);
    482}
    483
    484extern void (*__fib6_flush_trees)(struct net *net);
    485static inline void rt_genid_bump_ipv6(struct net *net)
    486{
    487	if (__fib6_flush_trees)
    488		__fib6_flush_trees(net);
    489}
    490
    491#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
    492static inline struct netns_ieee802154_lowpan *
    493net_ieee802154_lowpan(struct net *net)
    494{
    495	return &net->ieee802154_lowpan;
    496}
    497#endif
    498
    499/* For callers who don't really care about whether it's IPv4 or IPv6 */
    500static inline void rt_genid_bump_all(struct net *net)
    501{
    502	rt_genid_bump_ipv4(net);
    503	rt_genid_bump_ipv6(net);
    504}
    505
    506static inline int fnhe_genid(const struct net *net)
    507{
    508	return atomic_read(&net->fnhe_genid);
    509}
    510
    511static inline void fnhe_genid_bump(struct net *net)
    512{
    513	atomic_inc(&net->fnhe_genid);
    514}
    515
    516#ifdef CONFIG_NET
    517void net_ns_init(void);
    518#else
    519static inline void net_ns_init(void) {}
    520#endif
    521
    522#endif /* __NET_NET_NAMESPACE_H */