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 | /* Designate sk as UDP-Lite socket */ |
21 | static int udplite_sk_init(struct sock *sk) |
22 | { |
23 | udp_init_sock(sk); |
24 | pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, " |
25 | "please contact the netdev mailing list\n" ); |
26 | return 0; |
27 | } |
28 | |
29 | static int udplite_rcv(struct sk_buff *skb) |
30 | { |
31 | return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); |
32 | } |
33 | |
34 | static int udplite_err(struct sk_buff *skb, u32 info) |
35 | { |
36 | return __udp4_lib_err(skb, info, &udplite_table); |
37 | } |
38 | |
39 | static const struct net_protocol udplite_protocol = { |
40 | .handler = udplite_rcv, |
41 | .err_handler = udplite_err, |
42 | .no_policy = 1, |
43 | }; |
44 | |
45 | struct proto udplite_prot = { |
46 | .name = "UDP-Lite" , |
47 | .owner = THIS_MODULE, |
48 | .close = udp_lib_close, |
49 | .connect = ip4_datagram_connect, |
50 | .disconnect = udp_disconnect, |
51 | .ioctl = udp_ioctl, |
52 | .init = udplite_sk_init, |
53 | .destroy = udp_destroy_sock, |
54 | .setsockopt = udp_setsockopt, |
55 | .getsockopt = udp_getsockopt, |
56 | .sendmsg = udp_sendmsg, |
57 | .recvmsg = udp_recvmsg, |
58 | .hash = udp_lib_hash, |
59 | .unhash = udp_lib_unhash, |
60 | .rehash = udp_v4_rehash, |
61 | .get_port = udp_v4_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 udp_sock), |
70 | .h.udp_table = &udplite_table, |
71 | }; |
72 | EXPORT_SYMBOL(udplite_prot); |
73 | |
74 | static struct inet_protosw udplite4_protosw = { |
75 | .type = SOCK_DGRAM, |
76 | .protocol = IPPROTO_UDPLITE, |
77 | .prot = &udplite_prot, |
78 | .ops = &inet_dgram_ops, |
79 | .flags = INET_PROTOSW_PERMANENT, |
80 | }; |
81 | |
82 | #ifdef CONFIG_PROC_FS |
83 | static struct udp_seq_afinfo udplite4_seq_afinfo = { |
84 | .family = AF_INET, |
85 | .udp_table = &udplite_table, |
86 | }; |
87 | |
88 | static int __net_init udplite4_proc_init_net(struct net *net) |
89 | { |
90 | if (!proc_create_net_data(name: "udplite" , mode: 0444, parent: net->proc_net, ops: &udp_seq_ops, |
91 | state_size: sizeof(struct udp_iter_state), data: &udplite4_seq_afinfo)) |
92 | return -ENOMEM; |
93 | return 0; |
94 | } |
95 | |
96 | static void __net_exit udplite4_proc_exit_net(struct net *net) |
97 | { |
98 | remove_proc_entry("udplite" , net->proc_net); |
99 | } |
100 | |
101 | static struct pernet_operations udplite4_net_ops = { |
102 | .init = udplite4_proc_init_net, |
103 | .exit = udplite4_proc_exit_net, |
104 | }; |
105 | |
106 | static __init int udplite4_proc_init(void) |
107 | { |
108 | return register_pernet_subsys(&udplite4_net_ops); |
109 | } |
110 | #else |
111 | static inline int udplite4_proc_init(void) |
112 | { |
113 | return 0; |
114 | } |
115 | #endif |
116 | |
117 | void __init udplite4_register(void) |
118 | { |
119 | udp_table_init(&udplite_table, "UDP-Lite" ); |
120 | if (proto_register(prot: &udplite_prot, alloc_slab: 1)) |
121 | goto out_register_err; |
122 | |
123 | if (inet_add_protocol(prot: &udplite_protocol, IPPROTO_UDPLITE) < 0) |
124 | goto out_unregister_proto; |
125 | |
126 | inet_register_protosw(p: &udplite4_protosw); |
127 | |
128 | if (udplite4_proc_init()) |
129 | pr_err("%s: Cannot register /proc!\n" , __func__); |
130 | return; |
131 | |
132 | out_unregister_proto: |
133 | proto_unregister(prot: &udplite_prot); |
134 | out_register_err: |
135 | pr_crit("%s: Cannot add UDP-Lite protocol\n" , __func__); |
136 | } |
137 | |