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 15struct udp_table udplite_table __read_mostly; 16EXPORT_SYMBOL(udplite_table); 17 18static int udplite_rcv(struct sk_buff *skb) 19{ 20 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 21} 22 23static void udplite_err(struct sk_buff *skb, u32 info) 24{ 25 __udp4_lib_err(skb, info, &udplite_table); 26} 27 28static 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 35struct 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}; 61EXPORT_SYMBOL(udplite_prot); 62 63static struct inet_protosw udplite4_protosw = { 64 .type = SOCK_DGRAM, 65 .protocol = IPPROTO_UDPLITE, 66 .prot = &udplite_prot, 67 .ops = &inet_dgram_ops, 68 .no_check = 0, /* must checksum (RFC 3828) */ 69 .flags = INET_PROTOSW_PERMANENT, 70}; 71 72#ifdef CONFIG_PROC_FS 73static struct udp_seq_afinfo udplite4_seq_afinfo = { 74 .name = "udplite", 75 .family = AF_INET, 76 .udp_table = &udplite_table, 77 .seq_fops = { 78 .owner = THIS_MODULE, 79 }, 80 .seq_ops = { 81 .show = udp4_seq_show, 82 }, 83}; 84 85static int __net_init udplite4_proc_init_net(struct net *net) 86{ 87 return udp_proc_register(net, &udplite4_seq_afinfo); 88} 89 90static void __net_exit udplite4_proc_exit_net(struct net *net) 91{ 92 udp_proc_unregister(net, &udplite4_seq_afinfo); 93} 94 95static struct pernet_operations udplite4_net_ops = { 96 .init = udplite4_proc_init_net, 97 .exit = udplite4_proc_exit_net, 98}; 99 100static __init int udplite4_proc_init(void) 101{ 102 return register_pernet_subsys(&udplite4_net_ops); 103} 104#else 105static inline int udplite4_proc_init(void) 106{ 107 return 0; 108} 109#endif 110 111void __init udplite4_register(void) 112{ 113 udp_table_init(&udplite_table, "UDP-Lite"); 114 if (proto_register(&udplite_prot, 1)) 115 goto out_register_err; 116 117 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 118 goto out_unregister_proto; 119 120 inet_register_protosw(&udplite4_protosw); 121 122 if (udplite4_proc_init()) 123 printk(KERN_ERR "%s: Cannot register /proc!\n", __func__); 124 return; 125 126out_unregister_proto: 127 proto_unregister(&udplite_prot); 128out_register_err: 129 printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__); 130} 131