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
 16int 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		int val = 1;
 29
 30		err = kernel_setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
 31					(char *) &val, sizeof(val));
 32		if (err < 0)
 33			goto error;
 34	}
 35	if (cfg->bind_ifindex) {
 36		err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTOIFINDEX,
 37					(void *)&cfg->bind_ifindex,
 38					sizeof(cfg->bind_ifindex));
 39		if (err < 0)
 40			goto error;
 41	}
 42
 43	udp6_addr.sin6_family = AF_INET6;
 44	memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
 45	       sizeof(udp6_addr.sin6_addr));
 46	udp6_addr.sin6_port = cfg->local_udp_port;
 47	err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
 48			  sizeof(udp6_addr));
 49	if (err < 0)
 50		goto error;
 51
 52	if (cfg->peer_udp_port) {
 53		memset(&udp6_addr, 0, sizeof(udp6_addr));
 54		udp6_addr.sin6_family = AF_INET6;
 55		memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
 56		       sizeof(udp6_addr.sin6_addr));
 57		udp6_addr.sin6_port = cfg->peer_udp_port;
 58		err = kernel_connect(sock,
 59				     (struct sockaddr *)&udp6_addr,
 60				     sizeof(udp6_addr), 0);
 61	}
 62	if (err < 0)
 63		goto error;
 64
 65	udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
 66	udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
 67
 68	*sockp = sock;
 69	return 0;
 70
 71error:
 72	if (sock) {
 73		kernel_sock_shutdown(sock, SHUT_RDWR);
 74		sock_release(sock);
 75	}
 76	*sockp = NULL;
 77	return err;
 78}
 79EXPORT_SYMBOL_GPL(udp_sock_create6);
 80
 81int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
 82			 struct sk_buff *skb,
 83			 struct net_device *dev, struct in6_addr *saddr,
 84			 struct in6_addr *daddr,
 85			 __u8 prio, __u8 ttl, __be32 label,
 86			 __be16 src_port, __be16 dst_port, bool nocheck)
 87{
 88	struct udphdr *uh;
 89	struct ipv6hdr *ip6h;
 90
 91	__skb_push(skb, sizeof(*uh));
 92	skb_reset_transport_header(skb);
 93	uh = udp_hdr(skb);
 94
 95	uh->dest = dst_port;
 96	uh->source = src_port;
 97
 98	uh->len = htons(skb->len);
 99
100	skb_dst_set(skb, dst);
101
102	udp6_set_csum(nocheck, skb, saddr, daddr, skb->len);
103
104	__skb_push(skb, sizeof(*ip6h));
105	skb_reset_network_header(skb);
106	ip6h		  = ipv6_hdr(skb);
107	ip6_flow_hdr(ip6h, prio, label);
108	ip6h->payload_len = htons(skb->len);
109	ip6h->nexthdr     = IPPROTO_UDP;
110	ip6h->hop_limit   = ttl;
111	ip6h->daddr	  = *daddr;
112	ip6h->saddr	  = *saddr;
113
114	ip6tunnel_xmit(sk, skb, dev);
115	return 0;
116}
117EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
118
119MODULE_LICENSE("GPL");