1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * UDPLITEv6 An implementation of the UDP-Lite protocol over IPv6. 4 * See also net/ipv4/udplite.c 5 * 6 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> 7 * 8 * Changes: 9 * Fixes: 10 */ 11 #define pr_fmt(fmt) "UDPLite6: " fmt 12 13 #include <linux/export.h> 14 #include <linux/proc_fs.h> 15 #include "udp_impl.h" 16 17 static int udplitev6_sk_init(struct sock *sk) 18 { 19 udpv6_init_sock(sk); 20 udp_sk(sk)->pcflag = UDPLITE_BIT; 21 pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, " 22 "please contact the netdev mailing list\n"); 23 return 0; 24 } 25 26 static int udplitev6_rcv(struct sk_buff *skb) 27 { 28 return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 29 } 30 31 static int udplitev6_err(struct sk_buff *skb, 32 struct inet6_skb_parm *opt, 33 u8 type, u8 code, int offset, __be32 info) 34 { 35 return __udp6_lib_err(skb, opt, type, code, offset, info, 36 &udplite_table); 37 } 38 39 static const struct inet6_protocol udplitev6_protocol = { 40 .handler = udplitev6_rcv, 41 .err_handler = udplitev6_err, 42 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 43 }; 44 45 struct proto udplitev6_prot = { 46 .name = "UDPLITEv6", 47 .owner = THIS_MODULE, 48 .close = udp_lib_close, 49 .connect = ip6_datagram_connect, 50 .disconnect = udp_disconnect, 51 .ioctl = udp_ioctl, 52 .init = udplitev6_sk_init, 53 .destroy = udpv6_destroy_sock, 54 .setsockopt = udpv6_setsockopt, 55 .getsockopt = udpv6_getsockopt, 56 .sendmsg = udpv6_sendmsg, 57 .recvmsg = udpv6_recvmsg, 58 .hash = udp_lib_hash, 59 .unhash = udp_lib_unhash, 60 .rehash = udp_v6_rehash, 61 .get_port = udp_v6_get_port, 62 63 .memory_allocated = &udp_memory_allocated, 64 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 65 66 .sysctl_mem = sysctl_udp_mem, 67 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 68 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 69 .obj_size = sizeof(struct udp6_sock), 70 .h.udp_table = &udplite_table, 71 }; 72 73 static struct inet_protosw udplite6_protosw = { 74 .type = SOCK_DGRAM, 75 .protocol = IPPROTO_UDPLITE, 76 .prot = &udplitev6_prot, 77 .ops = &inet6_dgram_ops, 78 .flags = INET_PROTOSW_PERMANENT, 79 }; 80 81 int __init udplitev6_init(void) 82 { 83 int ret; 84 85 ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 86 if (ret) 87 goto out; 88 89 ret = inet6_register_protosw(&udplite6_protosw); 90 if (ret) 91 goto out_udplitev6_protocol; 92 out: 93 return ret; 94 95 out_udplitev6_protocol: 96 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 97 goto out; 98 } 99 100 void udplitev6_exit(void) 101 { 102 inet6_unregister_protosw(&udplite6_protosw); 103 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 104 } 105 106 #ifdef CONFIG_PROC_FS 107 static struct udp_seq_afinfo udplite6_seq_afinfo = { 108 .family = AF_INET6, 109 .udp_table = &udplite_table, 110 }; 111 112 static int __net_init udplite6_proc_init_net(struct net *net) 113 { 114 if (!proc_create_net_data("udplite6", 0444, net->proc_net, 115 &udp6_seq_ops, sizeof(struct udp_iter_state), 116 &udplite6_seq_afinfo)) 117 return -ENOMEM; 118 return 0; 119 } 120 121 static void __net_exit udplite6_proc_exit_net(struct net *net) 122 { 123 remove_proc_entry("udplite6", net->proc_net); 124 } 125 126 static struct pernet_operations udplite6_net_ops = { 127 .init = udplite6_proc_init_net, 128 .exit = udplite6_proc_exit_net, 129 }; 130 131 int __init udplite6_proc_init(void) 132 { 133 return register_pernet_subsys(&udplite6_net_ops); 134 } 135 136 void udplite6_proc_exit(void) 137 { 138 unregister_pernet_subsys(&udplite6_net_ops); 139 } 140 #endif 141