1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/module.h>
3 #include <linux/errno.h>
4 #include <linux/socket.h>
5 #include <linux/udp.h>
6 #include <linux/types.h>
7 #include <linux/kernel.h>
8 #include <linux/in6.h>
9 #include <net/udp.h>
10 #include <net/udp_tunnel.h>
11 #include <net/net_namespace.h>
12 #include <net/netns/generic.h>
13 #include <net/ip6_tunnel.h>
14 #include <net/ip6_checksum.h>
15
16 int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
17 struct socket **sockp)
18 {
19 struct sockaddr_in6 udp6_addr = {};
20 int err;
21 struct socket *sock = NULL;
22
23 err = sock_create_kern(net, AF_INET6, SOCK_DGRAM, 0, &sock);
24 if (err < 0)
25 goto error;
26
27 if (cfg->ipv6_v6only) {
28 err = ip6_sock_set_v6only(sock->sk);
29 if (err < 0)
30 goto error;
31 }
32 if (cfg->bind_ifindex) {
33 err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
34 if (err < 0)
35 goto error;
36 }
37
38 udp6_addr.sin6_family = AF_INET6;
39 memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
40 sizeof(udp6_addr.sin6_addr));
41 udp6_addr.sin6_port = cfg->local_udp_port;
42 err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
43 sizeof(udp6_addr));
44 if (err < 0)
45 goto error;
46
47 if (cfg->peer_udp_port) {
48 memset(&udp6_addr, 0, sizeof(udp6_addr));
49 udp6_addr.sin6_family = AF_INET6;
50 memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
51 sizeof(udp6_addr.sin6_addr));
52 udp6_addr.sin6_port = cfg->peer_udp_port;
53 err = kernel_connect(sock,
54 (struct sockaddr *)&udp6_addr,
55 sizeof(udp6_addr), 0);
56 }
57 if (err < 0)
58 goto error;
59
60 udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
61 udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
62
63 *sockp = sock;
64 return 0;
65
66 error:
67 if (sock) {
68 kernel_sock_shutdown(sock, SHUT_RDWR);
69 sock_release(sock);
70 }
71 *sockp = NULL;
72 return err;
73 }
74 EXPORT_SYMBOL_GPL(udp_sock_create6);
75
76 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
77 struct sk_buff *skb,
78 struct net_device *dev, struct in6_addr *saddr,
79 struct in6_addr *daddr,
80 __u8 prio, __u8 ttl, __be32 label,
81 __be16 src_port, __be16 dst_port, bool nocheck)
82 {
83 struct udphdr *uh;
84 struct ipv6hdr *ip6h;
85
86 __skb_push(skb, sizeof(*uh));
87 skb_reset_transport_header(skb);
88 uh = udp_hdr(skb);
89
90 uh->dest = dst_port;
91 uh->source = src_port;
92
93 uh->len = htons(skb->len);
94
95 skb_dst_set(skb, dst);
96
97 udp6_set_csum(nocheck, skb, saddr, daddr, skb->len);
98
99 __skb_push(skb, sizeof(*ip6h));
100 skb_reset_network_header(skb);
101 ip6h = ipv6_hdr(skb);
102 ip6_flow_hdr(ip6h, prio, label);
103 ip6h->payload_len = htons(skb->len);
104 ip6h->nexthdr = IPPROTO_UDP;
105 ip6h->hop_limit = ttl;
106 ip6h->daddr = *daddr;
107 ip6h->saddr = *saddr;
108
109 ip6tunnel_xmit(sk, skb, dev);
110 return 0;
111 }
112 EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
113
114 MODULE_LICENSE("GPL");
115
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