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1 | /* |
2 | * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828). |
3 | * |
4 | * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> |
5 | * |
6 | * Changes: |
7 | * Fixes: |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License |
10 | * as published by the Free Software Foundation; either version |
11 | * 2 of the License, or (at your option) any later version. |
12 | */ |
13 | #include "udp_impl.h" |
14 | |
15 | struct udp_table udplite_table __read_mostly; |
16 | EXPORT_SYMBOL(udplite_table); |
17 | |
18 | static int udplite_rcv(struct sk_buff *skb) |
19 | { |
20 | return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); |
21 | } |
22 | |
23 | static void udplite_err(struct sk_buff *skb, u32 info) |
24 | { |
25 | __udp4_lib_err(skb, info, &udplite_table); |
26 | } |
27 | |
28 | static const struct net_protocol udplite_protocol = { |
29 | .handler = udplite_rcv, |
30 | .err_handler = udplite_err, |
31 | .no_policy = 1, |
32 | .netns_ok = 1, |
33 | }; |
34 | |
35 | struct proto udplite_prot = { |
36 | .name = "UDP-Lite", |
37 | .owner = THIS_MODULE, |
38 | .close = udp_lib_close, |
39 | .connect = ip4_datagram_connect, |
40 | .disconnect = udp_disconnect, |
41 | .ioctl = udp_ioctl, |
42 | .init = udplite_sk_init, |
43 | .destroy = udp_destroy_sock, |
44 | .setsockopt = udp_setsockopt, |
45 | .getsockopt = udp_getsockopt, |
46 | .sendmsg = udp_sendmsg, |
47 | .recvmsg = udp_recvmsg, |
48 | .sendpage = udp_sendpage, |
49 | .backlog_rcv = udp_queue_rcv_skb, |
50 | .hash = udp_lib_hash, |
51 | .unhash = udp_lib_unhash, |
52 | .get_port = udp_v4_get_port, |
53 | .obj_size = sizeof(struct udp_sock), |
54 | .slab_flags = SLAB_DESTROY_BY_RCU, |
55 | .h.udp_table = &udplite_table, |
56 | #ifdef CONFIG_COMPAT |
57 | .compat_setsockopt = compat_udp_setsockopt, |
58 | .compat_getsockopt = compat_udp_getsockopt, |
59 | #endif |
60 | }; |
61 | |
62 | static struct inet_protosw udplite4_protosw = { |
63 | .type = SOCK_DGRAM, |
64 | .protocol = IPPROTO_UDPLITE, |
65 | .prot = &udplite_prot, |
66 | .ops = &inet_dgram_ops, |
67 | .no_check = 0, /* must checksum (RFC 3828) */ |
68 | .flags = INET_PROTOSW_PERMANENT, |
69 | }; |
70 | |
71 | #ifdef CONFIG_PROC_FS |
72 | static struct udp_seq_afinfo udplite4_seq_afinfo = { |
73 | .name = "udplite", |
74 | .family = AF_INET, |
75 | .udp_table = &udplite_table, |
76 | .seq_fops = { |
77 | .owner = THIS_MODULE, |
78 | }, |
79 | .seq_ops = { |
80 | .show = udp4_seq_show, |
81 | }, |
82 | }; |
83 | |
84 | static int __net_init udplite4_proc_init_net(struct net *net) |
85 | { |
86 | return udp_proc_register(net, &udplite4_seq_afinfo); |
87 | } |
88 | |
89 | static void __net_exit udplite4_proc_exit_net(struct net *net) |
90 | { |
91 | udp_proc_unregister(net, &udplite4_seq_afinfo); |
92 | } |
93 | |
94 | static struct pernet_operations udplite4_net_ops = { |
95 | .init = udplite4_proc_init_net, |
96 | .exit = udplite4_proc_exit_net, |
97 | }; |
98 | |
99 | static __init int udplite4_proc_init(void) |
100 | { |
101 | return register_pernet_subsys(&udplite4_net_ops); |
102 | } |
103 | #else |
104 | static inline int udplite4_proc_init(void) |
105 | { |
106 | return 0; |
107 | } |
108 | #endif |
109 | |
110 | void __init udplite4_register(void) |
111 | { |
112 | udp_table_init(&udplite_table, "UDP-Lite"); |
113 | if (proto_register(&udplite_prot, 1)) |
114 | goto out_register_err; |
115 | |
116 | if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) |
117 | goto out_unregister_proto; |
118 | |
119 | inet_register_protosw(&udplite4_protosw); |
120 | |
121 | if (udplite4_proc_init()) |
122 | printk(KERN_ERR "%s: Cannot register /proc!\n", __func__); |
123 | return; |
124 | |
125 | out_unregister_proto: |
126 | proto_unregister(&udplite_prot); |
127 | out_register_err: |
128 | printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__); |
129 | } |
130 | |
131 | EXPORT_SYMBOL(udplite_prot); |
132 |
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