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net/ipv4/protocol.c
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/* * 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> 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. ", 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); |