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