| /* |
| * 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. |
| * |
| * INET protocol dispatch tables. |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * |
| * Fixes: |
| * Alan Cox : Ahah! udp icmp errors don't work because |
| * udp_err is never called! |
| * Alan Cox : Added new fields for init and ready for |
| * proper fragmentation (_NO_ 4K limits!) |
| * Richard Colella : Hang on hash collision |
| * Vince Laviano : Modified inet_del_protocol() to correctly |
| * maintain copy bit. |
| * |
| * 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. |
| */ |
| #include <linux/cache.h> |
| #include <linux/module.h> |
| #include <linux/netdevice.h> |
| #include <linux/spinlock.h> |
| #include <net/protocol.h> |
| |
| const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly; |
| const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly; |
| EXPORT_SYMBOL(inet_offloads); |
| |
| int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol) |
| { |
| if (!prot->netns_ok) { |
| pr_err("Protocol %u is not namespace aware, cannot register.\n", |
| protocol); |
| return -EINVAL; |
| } |
| |
| return !cmpxchg((const struct net_protocol **)&inet_protos[protocol], |
| NULL, prot) ? 0 : -1; |
| } |
| EXPORT_SYMBOL(inet_add_protocol); |
| |
| int inet_add_offload(const struct net_offload *prot, unsigned char protocol) |
| { |
| return !cmpxchg((const struct net_offload **)&inet_offloads[protocol], |
| NULL, prot) ? 0 : -1; |
| } |
| EXPORT_SYMBOL(inet_add_offload); |
| |
| int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol) |
| { |
| int ret; |
| |
| ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol], |
| prot, NULL) == prot) ? 0 : -1; |
| |
| synchronize_net(); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(inet_del_protocol); |
| |
| int inet_del_offload(const struct net_offload *prot, unsigned char protocol) |
| { |
| int ret; |
| |
| ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol], |
| prot, NULL) == prot) ? 0 : -1; |
| |
| synchronize_net(); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(inet_del_offload); |