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-rw-r--r--net/ipv4/udplite.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
new file mode 100644
index 000000000..56d94d23b
--- /dev/null
+++ b/net/ipv4/udplite.c
@@ -0,0 +1,136 @@
+// 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__);
+}