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