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/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/net/

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/net

Name	Size	Mode	Actions
9p/	-	0755	rm
bluetooth/	-	0755	rm
caif/	-	0755	rm
iucv/	-	0755	rm
mana/	-	0755	rm
netfilter/	-	0755	rm
netns/	-	0755	rm
nfc/	-	0755	rm
phonet/	-	0755	rm
sctp/	-	0755	rm
tc_act/	-	0755	rm
6lowpan.h	10271	0644	edit dl rm
act_api.h	9559	0644	edit dl rm
addrconf.h	13826	0644	edit dl rm
af_ieee802154.h	1591	0644	edit dl rm
af_rxrpc.h	2976	0644	edit dl rm
af_unix.h	2272	0644	edit dl rm
af_vsock.h	7295	0644	edit dl rm
ah.h	382	0644	edit dl rm
arp.h	2052	0644	edit dl rm
atmclip.h	1515	0644	edit dl rm
ax25.h	14999	0644	edit dl rm
ax88796.h	1488	0644	edit dl rm
bareudp.h	333	0644	edit dl rm
bonding.h	20225	0644	edit dl rm
bond_3ad.h	9629	0644	edit dl rm
bond_alb.h	6251	0644	edit dl rm
bond_options.h	3916	0644	edit dl rm
bpf_sk_storage.h	1802	0644	edit dl rm
busy_poll.h	4973	0644	edit dl rm
calipso.h	2199	0644	edit dl rm
cfg80211-wext.h	1900	0644	edit dl rm
cfg80211.h	325844	0644	edit dl rm
cfg802154.h	11175	0644	edit dl rm
checksum.h	4850	0644	edit dl rm
cipso_ipv4.h	8399	0644	edit dl rm
cls_cgroup.h	2301	0644	edit dl rm
codel.h	6000	0644	edit dl rm
codel_impl.h	8500	0644	edit dl rm
codel_qdisc.h	3001	0644	edit dl rm
compat.h	1711	0644	edit dl rm
datalink.h	619	0644	edit dl rm
dcbevent.h	1293	0644	edit dl rm
dcbnl.h	5267	0644	edit dl rm
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dn_dev.h	5488	0644	edit dl rm
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dn_route.h	4500	0644	edit dl rm
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drop_monitor.h	901	0644	edit dl rm
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dsfield.h	1139	0644	edit dl rm
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dst_cache.h	2596	0644	edit dl rm
dst_metadata.h	5521	0644	edit dl rm
dst_ops.h	2564	0644	edit dl rm
erspan.h	8527	0644	edit dl rm
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espintcp.h	966	0644	edit dl rm
ethoc.h	537	0644	edit dl rm
failover.h	1178	0644	edit dl rm
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fib_rules.h	5728	0644	edit dl rm
firewire.h	636	0644	edit dl rm
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flow_offload.h	17797	0644	edit dl rm
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gen_stats.h	3034	0644	edit dl rm
gre.h	3377	0644	edit dl rm
gro_cells.h	443	0644	edit dl rm
gtp.h	633	0644	edit dl rm
gue.h	3311	0644	edit dl rm
hwbm.h	937	0644	edit dl rm
icmp.h	1765	0644	edit dl rm
ieee80211_radiotap.h	23017	0644	edit dl rm
ieee802154_netdev.h	9358	0644	edit dl rm
ife.h	1057	0644	edit dl rm
if_inet6.h	6591	0644	edit dl rm
ila.h	498	0644	edit dl rm
inet6_connection_sock.h	976	0644	edit dl rm
inet6_hashtables.h	3746	0644	edit dl rm
inetpeer.h	3372	0644	edit dl rm
inet_common.h	2614	0644	edit dl rm
inet_connection_sock.h	12070	0644	edit dl rm
inet_ecn.h	8071	0644	edit dl rm
inet_frag.h	4816	0644	edit dl rm
inet_hashtables.h	13847	0644	edit dl rm
inet_sock.h	9828	0644	edit dl rm
inet_timewait_sock.h	3926	0644	edit dl rm
ip.h	21354	0644	edit dl rm
ip6_checksum.h	2981	0644	edit dl rm
ip6_fib.h	13766	0644	edit dl rm
ip6_route.h	9228	0644	edit dl rm
ip6_tunnel.h	5096	0644	edit dl rm
ipcomp.h	659	0644	edit dl rm
ipconfig.h	811	0644	edit dl rm
ipv6.h	32741	0644	edit dl rm
ipv6_frag.h	3321	0644	edit dl rm
ipv6_stubs.h	2671	0644	edit dl rm
ipx.h	4386	0644	edit dl rm
ip_fib.h	14290	0644	edit dl rm
ip_tunnels.h	14697	0644	edit dl rm
ip_vs.h	49407	0644	edit dl rm
iw_handler.h	21413	0644	edit dl rm
kcm.h	5083	0644	edit dl rm
l3mdev.h	6743	0644	edit dl rm
lag.h	409	0644	edit dl rm
lapb.h	4869	0644	edit dl rm
lib80211.h	4017	0644	edit dl rm
llc.h	4464	0644	edit dl rm
llc_conn.h	4155	0644	edit dl rm
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llc_c_ev.h	10940	0644	edit dl rm
llc_c_st.h	1762	0644	edit dl rm
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mac80211.h	294437	0644	edit dl rm
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mip6.h	1617	0644	edit dl rm
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mpls.h	1340	0644	edit dl rm
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mptcp.h	6242	0644	edit dl rm
mrp.h	3103	0644	edit dl rm
ncsi.h	1964	0644	edit dl rm
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neighbour.h	16289	0644	edit dl rm
netdev_queues.h	5609	0644	edit dl rm
netevent.h	1044	0644	edit dl rm
netlabel.h	21236	0644	edit dl rm
netlink.h	63253	0644	edit dl rm
netprio_cgroup.h	1260	0644	edit dl rm
netrom.h	7896	0644	edit dl rm
net_failover.h	1023	0644	edit dl rm
net_namespace.h	14177	0644	edit dl rm
net_ratelimit.h	220	0644	edit dl rm
nexthop.h	865	0644	edit dl rm
nl802154.h	12385	0644	edit dl rm
nsh.h	12602	0644	edit dl rm
p8022.h	447	0644	edit dl rm
page_pool.h	6985	0644	edit dl rm
pie.h	3684	0644	edit dl rm
ping.h	3197	0644	edit dl rm
pkt_cls.h	26178	0644	edit dl rm
pkt_sched.h	6543	0644	edit dl rm
pptp.h	557	0644	edit dl rm
protocol.h	4320	0644	edit dl rm
psample.h	1083	0644	edit dl rm
psnap.h	351	0644	edit dl rm
raw.h	2161	0644	edit dl rm
rawv6.h	856	0644	edit dl rm
red.h	11600	0644	edit dl rm
regulatory.h	10961	0644	edit dl rm
request_sock.h	6871	0644	edit dl rm
rose.h	7802	0644	edit dl rm
route.h	11390	0644	edit dl rm
rsi_91x.h	1710	0644	edit dl rm
rtnetlink.h	7317	0644	edit dl rm
sch_generic.h	33841	0644	edit dl rm
scm.h	3671	0644	edit dl rm
secure_seq.h	855	0644	edit dl rm
seg6.h	1874	0644	edit dl rm
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seg6_local.h	870	0644	edit dl rm
slhc_vj.h	6831	0644	edit dl rm
smc.h	2155	0644	edit dl rm
snmp.h	5482	0644	edit dl rm
sock.h	79182	0644	edit dl rm
sock_reuseport.h	1565	0644	edit dl rm
Space.h	1094	0644	edit dl rm
stp.h	383	0644	edit dl rm
strparser.h	4340	0644	edit dl rm
switchdev.h	17812	0644	edit dl rm
tcp.h	73206	0644	edit dl rm
tcp_states.h	1540	0644	edit dl rm
tc_wrapper.h	7033	0644	edit dl rm
timewait_sock.h	1136	0644	edit dl rm
tipc.h	2405	0644	edit dl rm
tls.h	21363	0644	edit dl rm
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tun_proto.h	988	0644	edit dl rm
udp.h	16481	0644	edit dl rm
udplite.h	3762	0644	edit dl rm
udp_tunnel.h	13376	0644	edit dl rm
vsock_addr.h	662	0644	edit dl rm
vxlan.h	13541	0644	edit dl rm
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xdp_priv.h	446	0644	edit dl rm
xdp_sock.h	2094	0644	edit dl rm
xdp_sock_drv.h	6423	0644	edit dl rm
xfrm.h	59628	0644	edit dl rm
xsk_buff_pool.h	6550	0644	edit dl rm

Edit: /usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/net/inet_hashtables.h (13847B)

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the BSD Socket
 *		interface as the means of communication with the user level.
 *
 * Authors:	Lotsa people, from code originally in tcp
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#ifndef _INET_HASHTABLES_H
#define _INET_HASHTABLES_H

#include <linux/interrupt.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/wait.h>

#include <net/inet_connection_sock.h>
#include <net/inet_sock.h>
#include <net/sock.h>
#include <net/route.h>
#include <net/tcp_states.h>
#include <net/netns/hash.h>

#include <linux/refcount.h>
#include <asm/byteorder.h>

/* This is for all connections with a full identity, no wildcards.
 * The 'e' prefix stands for Establish, but we really put all sockets
 * but LISTEN ones.
 */
struct inet_ehash_bucket {
	struct hlist_nulls_head chain;
};

/* There are a few simple rules, which allow for local port reuse by
 * an application.  In essence:
 *
 *	1) Sockets bound to different interfaces may share a local port.
 *	   Failing that, goto test 2.
 *	2) If all sockets have sk->sk_reuse set, and none of them are in
 *	   TCP_LISTEN state, the port may be shared.
 *	   Failing that, goto test 3.
 *	3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
 *	   address, and none of them are the same, the port may be
 *	   shared.
 *	   Failing this, the port cannot be shared.
 *
 * The interesting point, is test #2.  This is what an FTP server does
 * all day.  To optimize this case we use a specific flag bit defined
 * below.  As we add sockets to a bind bucket list, we perform a
 * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
 * As long as all sockets added to a bind bucket pass this test,
 * the flag bit will be set.
 * The resulting situation is that tcp_v[46]_verify_bind() can just check
 * for this flag bit, if it is set and the socket trying to bind has
 * sk->sk_reuse set, we don't even have to walk the owners list at all,
 * we return that it is ok to bind this socket to the requested local port.
 *
 * Sounds like a lot of work, but it is worth it.  In a more naive
 * implementation (ie. current FreeBSD etc.) the entire list of ports
 * must be walked for each data port opened by an ftp server.  Needless
 * to say, this does not scale at all.  With a couple thousand FTP
 * users logged onto your box, isn't it nice to know that new data
 * ports are created in O(1) time?  I thought so. ;-)	-DaveM
 */
#define FASTREUSEPORT_ANY	1
#define FASTREUSEPORT_STRICT	2

struct inet_bind_bucket {
	possible_net_t		ib_net;
	int			l3mdev;
	unsigned short		port;
	signed char		fastreuse;
	signed char		fastreuseport;
	kuid_t			fastuid;
#if IS_ENABLED(CONFIG_IPV6)
	struct in6_addr		fast_v6_rcv_saddr;
#endif
	__be32			fast_rcv_saddr;
	unsigned short		fast_sk_family;
	bool			fast_ipv6_only;
	struct hlist_node	node;
	struct hlist_head	owners;
};

static inline struct net *ib_net(struct inet_bind_bucket *ib)
{
	return read_pnet(&ib->ib_net);
}

#define inet_bind_bucket_for_each(tb, head) \
	hlist_for_each_entry(tb, head, node)

struct inet_bind_hashbucket {
	spinlock_t		lock;
	struct hlist_head	chain;
};

/*
 * Sockets can be hashed in established or listening table
 */
struct inet_listen_hashbucket {
	spinlock_t		lock;
	unsigned int		count;
	struct hlist_head	head;
};

/* This is for listening sockets, thus all sockets which possess wildcards. */
#define INET_LHTABLE_SIZE	32	/* Yes, really, this is all you need. */

struct inet_hashinfo {
	/* This is for sockets with full identity only.  Sockets here will
	 * always be without wildcards and will have the following invariant:
	 *
	 *          TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
	 *
	 */
	struct inet_ehash_bucket	*ehash;
	spinlock_t			*ehash_locks;
	unsigned int			ehash_mask;
	unsigned int			ehash_locks_mask;

/* Ok, let's try this, I give up, we do need a local binding
	 * TCP hash as well as the others for fast bind/connect.
	 */
	struct kmem_cache		*bind_bucket_cachep;
	struct inet_bind_hashbucket	*bhash;
	unsigned int			bhash_size;

/* The 2nd listener table hashed by local port and address */
	unsigned int			lhash2_mask;
	struct inet_listen_hashbucket	*lhash2;

/* All the above members are written once at bootup and
	 * never written again _or_ are predominantly read-access.
	 *
	 * Now align to a new cache line as all the following members
	 * might be often dirty.
	 */
	/* All sockets in TCP_LISTEN state will be in listening_hash.
	 * This is the only table where wildcard'd TCP sockets can
	 * exist.  listening_hash is only hashed by local port number.
	 * If lhash2 is initialized, the same socket will also be hashed
	 * to lhash2 by port and address.
	 */
	struct inet_listen_hashbucket	listening_hash[INET_LHTABLE_SIZE]
					____cacheline_aligned_in_smp;
};

#define inet_lhash2_for_each_icsk_rcu(__icsk, list) \
	hlist_for_each_entry_rcu(__icsk, list, icsk_listen_portaddr_node)

static inline struct inet_listen_hashbucket *
inet_lhash2_bucket(struct inet_hashinfo *h, u32 hash)
{
	return &h->lhash2[hash & h->lhash2_mask];
}

static inline struct inet_ehash_bucket *inet_ehash_bucket(
	struct inet_hashinfo *hashinfo,
	unsigned int hash)
{
	return &hashinfo->ehash[hash & hashinfo->ehash_mask];
}

static inline spinlock_t *inet_ehash_lockp(
	struct inet_hashinfo *hashinfo,
	unsigned int hash)
{
	return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
}

int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo);

static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
{
	kvfree(hashinfo->ehash_locks);
	hashinfo->ehash_locks = NULL;
}

static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if,
					int dif, int sdif)
{
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
	return inet_bound_dev_eq(!!net->ipv4.sysctl_tcp_l3mdev_accept,
				 bound_dev_if, dif, sdif);
#else
	return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
#endif
}

struct inet_bind_bucket *
inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
			struct inet_bind_hashbucket *head,
			const unsigned short snum, int l3mdev);
void inet_bind_bucket_destroy(struct kmem_cache *cachep,
			      struct inet_bind_bucket *tb);

static inline u32 inet_bhashfn(const struct net *net, const __u16 lport,
			       const u32 bhash_size)
{
	return (lport + net_hash_mix(net)) & (bhash_size - 1);
}

void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
		    const unsigned short snum);

/* These can have wildcards, don't try too hard. */
static inline u32 inet_lhashfn(const struct net *net, const unsigned short num)
{
	return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
}

static inline int inet_sk_listen_hashfn(const struct sock *sk)
{
	return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
}

/* Caller must disable local BH processing. */
int __inet_inherit_port(const struct sock *sk, struct sock *child);

void inet_put_port(struct sock *sk);

void inet_hashinfo_init(struct inet_hashinfo *h);
void inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
			 unsigned long numentries, int scale,
			 unsigned long low_limit,
			 unsigned long high_limit);

bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk);
bool inet_ehash_nolisten(struct sock *sk, struct sock *osk,
			 bool *found_dup_sk);
int __inet_hash(struct sock *sk, struct sock *osk);
int inet_hash(struct sock *sk);
void inet_unhash(struct sock *sk);

struct sock *__inet_lookup_listener(struct net *net,
				    struct inet_hashinfo *hashinfo,
				    struct sk_buff *skb, int doff,
				    const __be32 saddr, const __be16 sport,
				    const __be32 daddr,
				    const unsigned short hnum,
				    const int dif, const int sdif);

static inline struct sock *inet_lookup_listener(struct net *net,
		struct inet_hashinfo *hashinfo,
		struct sk_buff *skb, int doff,
		__be32 saddr, __be16 sport,
		__be32 daddr, __be16 dport, int dif, int sdif)
{
	return __inet_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
				      daddr, ntohs(dport), dif, sdif);
}

/* Socket demux engine toys. */
/* What happens here is ugly; there's a pair of adjacent fields in
   struct inet_sock; __be16 dport followed by __u16 num.  We want to
   search by pair, so we combine the keys into a single 32bit value
   and compare with 32bit value read from &...->dport.  Let's at least
   make sure that it's not mixed with anything else...
   On 64bit targets we combine comparisons with pair of adjacent __be32
   fields in the same way.
*/
#ifdef __BIG_ENDIAN
#define INET_COMBINED_PORTS(__sport, __dport) \
	((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
#else /* __LITTLE_ENDIAN */
#define INET_COMBINED_PORTS(__sport, __dport) \
	((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
#endif

#if (BITS_PER_LONG == 64)
#ifdef __BIG_ENDIAN
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
	const __addrpair __name = (__force __addrpair) ( \
				   (((__force __u64)(__be32)(__saddr)) << 32) | \
				   ((__force __u64)(__be32)(__daddr)))
#else /* __LITTLE_ENDIAN */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
	const __addrpair __name = (__force __addrpair) ( \
				   (((__force __u64)(__be32)(__daddr)) << 32) | \
				   ((__force __u64)(__be32)(__saddr)))
#endif /* __BIG_ENDIAN */
#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif, __sdif) \
	(((__sk)->sk_portpair == (__ports))			&&	\
	 ((__sk)->sk_addrpair == (__cookie))			&&	\
	 (((__sk)->sk_bound_dev_if == (__dif))			||	\
	  ((__sk)->sk_bound_dev_if == (__sdif)))		&&	\
	 net_eq(sock_net(__sk), (__net)))
#else /* 32-bit arch */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
	const int __name __deprecated __attribute__((unused))

#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif, __sdif) \
	(((__sk)->sk_portpair == (__ports))		&&		\
	 ((__sk)->sk_daddr	== (__saddr))		&&		\
	 ((__sk)->sk_rcv_saddr	== (__daddr))		&&		\
	 (((__sk)->sk_bound_dev_if == (__dif))		||		\
	  ((__sk)->sk_bound_dev_if == (__sdif)))	&&		\
	 net_eq(sock_net(__sk), (__net)))
#endif /* 64-bit arch */

/* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
 * not check it for lookups anymore, thanks Alexey. -DaveM
 */
struct sock *__inet_lookup_established(struct net *net,
				       struct inet_hashinfo *hashinfo,
				       const __be32 saddr, const __be16 sport,
				       const __be32 daddr, const u16 hnum,
				       const int dif, const int sdif);

static inline struct sock *
	inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
				const __be32 saddr, const __be16 sport,
				const __be32 daddr, const __be16 dport,
				const int dif)
{
	return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
					 ntohs(dport), dif, 0);
}

static inline struct sock *__inet_lookup(struct net *net,
					 struct inet_hashinfo *hashinfo,
					 struct sk_buff *skb, int doff,
					 const __be32 saddr, const __be16 sport,
					 const __be32 daddr, const __be16 dport,
					 const int dif, const int sdif,
					 bool *refcounted)
{
	u16 hnum = ntohs(dport);
	struct sock *sk;

sk = __inet_lookup_established(net, hashinfo, saddr, sport,
				       daddr, hnum, dif, sdif);
	*refcounted = true;
	if (sk)
		return sk;
	*refcounted = false;
	return __inet_lookup_listener(net, hashinfo, skb, doff, saddr,
				      sport, daddr, hnum, dif, sdif);
}

static inline struct sock *inet_lookup(struct net *net,
				       struct inet_hashinfo *hashinfo,
				       struct sk_buff *skb, int doff,
				       const __be32 saddr, const __be16 sport,
				       const __be32 daddr, const __be16 dport,
				       const int dif)
{
	struct sock *sk;
	bool refcounted;

sk = __inet_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
			   dport, dif, 0, &refcounted);

if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
		sk = NULL;
	return sk;
}

static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
					     struct sk_buff *skb,
					     int doff,
					     const __be16 sport,
					     const __be16 dport,
					     const int sdif,
					     bool *refcounted)
{
	struct sock *sk = skb_steal_sock(skb, refcounted);
	const struct iphdr *iph = ip_hdr(skb);

if (sk)
		return sk;

return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
			     doff, iph->saddr, sport,
			     iph->daddr, dport, inet_iif(skb), sdif,
			     refcounted);
}

u32 inet6_ehashfn(const struct net *net,
		  const struct in6_addr *laddr, const u16 lport,
		  const struct in6_addr *faddr, const __be16 fport);

static inline void sk_daddr_set(struct sock *sk, __be32 addr)
{
	sk->sk_daddr = addr; /* alias of inet_daddr */
#if IS_ENABLED(CONFIG_IPV6)
	ipv6_addr_set_v4mapped(addr, &sk->sk_v6_daddr);
#endif
}

static inline void sk_rcv_saddr_set(struct sock *sk, __be32 addr)
{
	sk->sk_rcv_saddr = addr; /* alias of inet_rcv_saddr */
#if IS_ENABLED(CONFIG_IPV6)
	ipv6_addr_set_v4mapped(addr, &sk->sk_v6_rcv_saddr);
#endif
}

int __inet_hash_connect(struct inet_timewait_death_row *death_row,
			struct sock *sk, u64 port_offset,
			int (*check_established)(struct inet_timewait_death_row *,
						 struct sock *, __u16,
						 struct inet_timewait_sock **));

int inet_hash_connect(struct inet_timewait_death_row *death_row,
		      struct sock *sk);
#endif /* _INET_HASHTABLES_H */

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