1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828). 4 * 5 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> 6 * 7 * Changes: 8 * Fixes: 9 */ 10 11 #define pr_fmt(fmt) "UDPLite: " fmt 12 13 #include <linux/export.h> 14 #include <linux/proc_fs.h> 15 #include "udp_impl.h" 16 17 struct udp_table udplite_table __read_mostly; 18 EXPORT_SYMBOL(udplite_table); 19 20 static int udplite_rcv(struct sk_buff *skb) 21 { 22 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 23 } 24 25 static int udplite_err(struct sk_buff *skb, u32 info) 26 { 27 return __udp4_lib_err(skb, info, &udplite_table); 28 } 29 30 static const struct net_protocol udplite_protocol = { 31 .handler = udplite_rcv, 32 .err_handler = udplite_err, 33 .no_policy = 1, 34 .netns_ok = 1, 35 }; 36 37 struct proto udplite_prot = { 38 .name = "UDP-Lite", 39 .owner = THIS_MODULE, 40 .close = udp_lib_close, 41 .connect = ip4_datagram_connect, 42 .disconnect = udp_disconnect, 43 .ioctl = udp_ioctl, 44 .init = udplite_sk_init, 45 .destroy = udp_destroy_sock, 46 .setsockopt = udp_setsockopt, 47 .getsockopt = udp_getsockopt, 48 .sendmsg = udp_sendmsg, 49 .recvmsg = udp_recvmsg, 50 .sendpage = udp_sendpage, 51 .hash = udp_lib_hash, 52 .unhash = udp_lib_unhash, 53 .rehash = udp_v4_rehash, 54 .get_port = udp_v4_get_port, 55 .memory_allocated = &udp_memory_allocated, 56 .sysctl_mem = sysctl_udp_mem, 57 .obj_size = sizeof(struct udp_sock), 58 .h.udp_table = &udplite_table, 59 }; 60 EXPORT_SYMBOL(udplite_prot); 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 .flags = INET_PROTOSW_PERMANENT, 68 }; 69 70 #ifdef CONFIG_PROC_FS 71 static struct udp_seq_afinfo udplite4_seq_afinfo = { 72 .family = AF_INET, 73 .udp_table = &udplite_table, 74 }; 75 76 static int __net_init udplite4_proc_init_net(struct net *net) 77 { 78 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops, 79 sizeof(struct udp_iter_state), &udplite4_seq_afinfo)) 80 return -ENOMEM; 81 return 0; 82 } 83 84 static void __net_exit udplite4_proc_exit_net(struct net *net) 85 { 86 remove_proc_entry("udplite", net->proc_net); 87 } 88 89 static struct pernet_operations udplite4_net_ops = { 90 .init = udplite4_proc_init_net, 91 .exit = udplite4_proc_exit_net, 92 }; 93 94 static __init int udplite4_proc_init(void) 95 { 96 return register_pernet_subsys(&udplite4_net_ops); 97 } 98 #else 99 static inline int udplite4_proc_init(void) 100 { 101 return 0; 102 } 103 #endif 104 105 void __init udplite4_register(void) 106 { 107 udp_table_init(&udplite_table, "UDP-Lite"); 108 if (proto_register(&udplite_prot, 1)) 109 goto out_register_err; 110 111 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 112 goto out_unregister_proto; 113 114 inet_register_protosw(&udplite4_protosw); 115 116 if (udplite4_proc_init()) 117 pr_err("%s: Cannot register /proc!\n", __func__); 118 return; 119 120 out_unregister_proto: 121 proto_unregister(&udplite_prot); 122 out_register_err: 123 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); 124 } 125