1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun #include <linux/module.h>
3*4882a593Smuzhiyun #include <linux/errno.h>
4*4882a593Smuzhiyun #include <linux/socket.h>
5*4882a593Smuzhiyun #include <linux/udp.h>
6*4882a593Smuzhiyun #include <linux/types.h>
7*4882a593Smuzhiyun #include <linux/kernel.h>
8*4882a593Smuzhiyun #include <linux/in6.h>
9*4882a593Smuzhiyun #include <net/udp.h>
10*4882a593Smuzhiyun #include <net/udp_tunnel.h>
11*4882a593Smuzhiyun #include <net/net_namespace.h>
12*4882a593Smuzhiyun #include <net/netns/generic.h>
13*4882a593Smuzhiyun #include <net/ip6_tunnel.h>
14*4882a593Smuzhiyun #include <net/ip6_checksum.h>
15*4882a593Smuzhiyun
udp_sock_create6(struct net * net,struct udp_port_cfg * cfg,struct socket ** sockp)16*4882a593Smuzhiyun int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
17*4882a593Smuzhiyun struct socket **sockp)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun struct sockaddr_in6 udp6_addr = {};
20*4882a593Smuzhiyun int err;
21*4882a593Smuzhiyun struct socket *sock = NULL;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun err = sock_create_kern(net, AF_INET6, SOCK_DGRAM, 0, &sock);
24*4882a593Smuzhiyun if (err < 0)
25*4882a593Smuzhiyun goto error;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun if (cfg->ipv6_v6only) {
28*4882a593Smuzhiyun err = ip6_sock_set_v6only(sock->sk);
29*4882a593Smuzhiyun if (err < 0)
30*4882a593Smuzhiyun goto error;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun if (cfg->bind_ifindex) {
33*4882a593Smuzhiyun err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
34*4882a593Smuzhiyun if (err < 0)
35*4882a593Smuzhiyun goto error;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun udp6_addr.sin6_family = AF_INET6;
39*4882a593Smuzhiyun memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
40*4882a593Smuzhiyun sizeof(udp6_addr.sin6_addr));
41*4882a593Smuzhiyun udp6_addr.sin6_port = cfg->local_udp_port;
42*4882a593Smuzhiyun err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
43*4882a593Smuzhiyun sizeof(udp6_addr));
44*4882a593Smuzhiyun if (err < 0)
45*4882a593Smuzhiyun goto error;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun if (cfg->peer_udp_port) {
48*4882a593Smuzhiyun memset(&udp6_addr, 0, sizeof(udp6_addr));
49*4882a593Smuzhiyun udp6_addr.sin6_family = AF_INET6;
50*4882a593Smuzhiyun memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
51*4882a593Smuzhiyun sizeof(udp6_addr.sin6_addr));
52*4882a593Smuzhiyun udp6_addr.sin6_port = cfg->peer_udp_port;
53*4882a593Smuzhiyun err = kernel_connect(sock,
54*4882a593Smuzhiyun (struct sockaddr *)&udp6_addr,
55*4882a593Smuzhiyun sizeof(udp6_addr), 0);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun if (err < 0)
58*4882a593Smuzhiyun goto error;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
61*4882a593Smuzhiyun udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun *sockp = sock;
64*4882a593Smuzhiyun return 0;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun error:
67*4882a593Smuzhiyun if (sock) {
68*4882a593Smuzhiyun kernel_sock_shutdown(sock, SHUT_RDWR);
69*4882a593Smuzhiyun sock_release(sock);
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun *sockp = NULL;
72*4882a593Smuzhiyun return err;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(udp_sock_create6);
75*4882a593Smuzhiyun
udp_tunnel6_xmit_skb(struct dst_entry * dst,struct sock * sk,struct sk_buff * skb,struct net_device * dev,struct in6_addr * saddr,struct in6_addr * daddr,__u8 prio,__u8 ttl,__be32 label,__be16 src_port,__be16 dst_port,bool nocheck)76*4882a593Smuzhiyun int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
77*4882a593Smuzhiyun struct sk_buff *skb,
78*4882a593Smuzhiyun struct net_device *dev, struct in6_addr *saddr,
79*4882a593Smuzhiyun struct in6_addr *daddr,
80*4882a593Smuzhiyun __u8 prio, __u8 ttl, __be32 label,
81*4882a593Smuzhiyun __be16 src_port, __be16 dst_port, bool nocheck)
82*4882a593Smuzhiyun {
83*4882a593Smuzhiyun struct udphdr *uh;
84*4882a593Smuzhiyun struct ipv6hdr *ip6h;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun __skb_push(skb, sizeof(*uh));
87*4882a593Smuzhiyun skb_reset_transport_header(skb);
88*4882a593Smuzhiyun uh = udp_hdr(skb);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun uh->dest = dst_port;
91*4882a593Smuzhiyun uh->source = src_port;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun uh->len = htons(skb->len);
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun skb_dst_set(skb, dst);
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun udp6_set_csum(nocheck, skb, saddr, daddr, skb->len);
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun __skb_push(skb, sizeof(*ip6h));
100*4882a593Smuzhiyun skb_reset_network_header(skb);
101*4882a593Smuzhiyun ip6h = ipv6_hdr(skb);
102*4882a593Smuzhiyun ip6_flow_hdr(ip6h, prio, label);
103*4882a593Smuzhiyun ip6h->payload_len = htons(skb->len);
104*4882a593Smuzhiyun ip6h->nexthdr = IPPROTO_UDP;
105*4882a593Smuzhiyun ip6h->hop_limit = ttl;
106*4882a593Smuzhiyun ip6h->daddr = *daddr;
107*4882a593Smuzhiyun ip6h->saddr = *saddr;
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun ip6tunnel_xmit(sk, skb, dev);
110*4882a593Smuzhiyun return 0;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun MODULE_LICENSE("GPL");
115