| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828). |
| * |
| * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> |
| * |
| * Changes: |
| * Fixes: |
| */ |
| |
| #define pr_fmt(fmt) "UDPLite: " fmt |
| |
| #include <linux/export.h> |
| #include <linux/proc_fs.h> |
| #include "udp_impl.h" |
| |
| struct udp_table udplite_table __read_mostly; |
| EXPORT_SYMBOL(udplite_table); |
| |
| /* Designate sk as UDP-Lite socket */ |
| static int udplite_sk_init(struct sock *sk) |
| { |
| udp_init_sock(sk); |
| udp_sk(sk)->pcflag = UDPLITE_BIT; |
| return 0; |
| } |
| |
| static int udplite_rcv(struct sk_buff *skb) |
| { |
| return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); |
| } |
| |
| static int udplite_err(struct sk_buff *skb, u32 info) |
| { |
| return __udp4_lib_err(skb, info, &udplite_table); |
| } |
| |
| static const struct net_protocol udplite_protocol = { |
| .handler = udplite_rcv, |
| .err_handler = udplite_err, |
| .no_policy = 1, |
| }; |
| |
| struct proto udplite_prot = { |
| .name = "UDP-Lite", |
| .owner = THIS_MODULE, |
| .close = udp_lib_close, |
| .connect = ip4_datagram_connect, |
| .disconnect = udp_disconnect, |
| .ioctl = udp_ioctl, |
| .init = udplite_sk_init, |
| .destroy = udp_destroy_sock, |
| .setsockopt = udp_setsockopt, |
| .getsockopt = udp_getsockopt, |
| .sendmsg = udp_sendmsg, |
| .recvmsg = udp_recvmsg, |
| .sendpage = udp_sendpage, |
| .hash = udp_lib_hash, |
| .unhash = udp_lib_unhash, |
| .rehash = udp_v4_rehash, |
| .get_port = udp_v4_get_port, |
| |
| .memory_allocated = &udp_memory_allocated, |
| .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, |
| |
| .sysctl_mem = sysctl_udp_mem, |
| .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), |
| .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), |
| .obj_size = sizeof(struct udp_sock), |
| .h.udp_table = &udplite_table, |
| }; |
| EXPORT_SYMBOL(udplite_prot); |
| |
| static struct inet_protosw udplite4_protosw = { |
| .type = SOCK_DGRAM, |
| .protocol = IPPROTO_UDPLITE, |
| .prot = &udplite_prot, |
| .ops = &inet_dgram_ops, |
| .flags = INET_PROTOSW_PERMANENT, |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| static struct udp_seq_afinfo udplite4_seq_afinfo = { |
| .family = AF_INET, |
| .udp_table = &udplite_table, |
| }; |
| |
| static int __net_init udplite4_proc_init_net(struct net *net) |
| { |
| if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops, |
| sizeof(struct udp_iter_state), &udplite4_seq_afinfo)) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void __net_exit udplite4_proc_exit_net(struct net *net) |
| { |
| remove_proc_entry("udplite", net->proc_net); |
| } |
| |
| static struct pernet_operations udplite4_net_ops = { |
| .init = udplite4_proc_init_net, |
| .exit = udplite4_proc_exit_net, |
| }; |
| |
| static __init int udplite4_proc_init(void) |
| { |
| return register_pernet_subsys(&udplite4_net_ops); |
| } |
| #else |
| static inline int udplite4_proc_init(void) |
| { |
| return 0; |
| } |
| #endif |
| |
| void __init udplite4_register(void) |
| { |
| udp_table_init(&udplite_table, "UDP-Lite"); |
| if (proto_register(&udplite_prot, 1)) |
| goto out_register_err; |
| |
| if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) |
| goto out_unregister_proto; |
| |
| inet_register_protosw(&udplite4_protosw); |
| |
| if (udplite4_proc_init()) |
| pr_err("%s: Cannot register /proc!\n", __func__); |
| return; |
| |
| out_unregister_proto: |
| proto_unregister(&udplite_prot); |
| out_register_err: |
| pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); |
| } |