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