diff options
author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
---|---|---|
committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
commit | fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204 (patch) | |
tree | 22962a4387943edc841c72a4e636a068c66d58fd /net/ipv4/protocol.c | |
download | ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.zip ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.tar.gz |
Initial import of modified Linux 2.6.28 tree
Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y
Diffstat (limited to 'net/ipv4/protocol.c')
-rw-r--r-- | net/ipv4/protocol.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c new file mode 100644 index 0000000..ea50da0 --- /dev/null +++ b/net/ipv4/protocol.c @@ -0,0 +1,96 @@ +/* + * 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 <asm/uaccess.h> +#include <asm/system.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/timer.h> +#include <net/ip.h> +#include <net/protocol.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/icmp.h> +#include <net/udp.h> +#include <net/ipip.h> +#include <linux/igmp.h> + +struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp; +static DEFINE_SPINLOCK(inet_proto_lock); + +/* + * Add a protocol handler to the hash tables + */ + +int inet_add_protocol(struct net_protocol *prot, unsigned char protocol) +{ + int hash, ret; + + hash = protocol & (MAX_INET_PROTOS - 1); + + spin_lock_bh(&inet_proto_lock); + if (inet_protos[hash]) { + ret = -1; + } else { + inet_protos[hash] = prot; + ret = 0; + } + spin_unlock_bh(&inet_proto_lock); + + return ret; +} + +/* + * Remove a protocol from the hash tables. + */ + +int inet_del_protocol(struct net_protocol *prot, unsigned char protocol) +{ + int hash, ret; + + hash = protocol & (MAX_INET_PROTOS - 1); + + spin_lock_bh(&inet_proto_lock); + if (inet_protos[hash] == prot) { + inet_protos[hash] = NULL; + ret = 0; + } else { + ret = -1; + } + spin_unlock_bh(&inet_proto_lock); + + synchronize_net(); + + return ret; +} + +EXPORT_SYMBOL(inet_add_protocol); +EXPORT_SYMBOL(inet_del_protocol); |