Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * INET		An implementation of the TCP/IP protocol suite for the LINUX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *		operating system.  INET is implemented using the  BSD Socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *		interface as the means of communication with the user level.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *		INET protocol dispatch tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Authors:	Ross Biro
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * Fixes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  *		Alan Cox	: Ahah! udp icmp errors don't work because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *				  udp_err is never called!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *		Alan Cox	: Added new fields for init and ready for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  *				  proper fragmentation (_NO_ 4K limits!)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  *		Richard Colella	: Hang on hash collision
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *		Vince Laviano	: Modified inet_del_protocol() to correctly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  *				  maintain copy bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/cache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) EXPORT_SYMBOL(inet_protos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) EXPORT_SYMBOL(inet_offloads);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	if (!prot->netns_ok) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		pr_err("Protocol %u is not namespace aware, cannot register.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 			protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	return !cmpxchg((const struct net_protocol **)&inet_protos[protocol],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 			NULL, prot) ? 0 : -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) EXPORT_SYMBOL(inet_add_protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) int inet_add_offload(const struct net_offload *prot, unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	return !cmpxchg((const struct net_offload **)&inet_offloads[protocol],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 			NULL, prot) ? 0 : -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) EXPORT_SYMBOL(inet_add_offload);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		       prot, NULL) == prot) ? 0 : -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	synchronize_net();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) EXPORT_SYMBOL(inet_del_protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int inet_del_offload(const struct net_offload *prot, unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		       prot, NULL) == prot) ? 0 : -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	synchronize_net();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) EXPORT_SYMBOL(inet_del_offload);