// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/socket.h>
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#include <linux/udp.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/in6.h>
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#include <net/udp.h>
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#include <net/udp_tunnel.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/ip6_tunnel.h>
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#include <net/ip6_checksum.h>
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int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp)
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{
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struct sockaddr_in6 udp6_addr = {};
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int err;
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struct socket *sock = NULL;
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err = sock_create_kern(net, AF_INET6, SOCK_DGRAM, 0, &sock);
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if (err < 0)
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goto error;
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if (cfg->ipv6_v6only) {
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err = ip6_sock_set_v6only(sock->sk);
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if (err < 0)
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goto error;
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}
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if (cfg->bind_ifindex) {
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err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
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if (err < 0)
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goto error;
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}
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udp6_addr.sin6_family = AF_INET6;
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memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
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sizeof(udp6_addr.sin6_addr));
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udp6_addr.sin6_port = cfg->local_udp_port;
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err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
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sizeof(udp6_addr));
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if (err < 0)
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goto error;
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if (cfg->peer_udp_port) {
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memset(&udp6_addr, 0, sizeof(udp6_addr));
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udp6_addr.sin6_family = AF_INET6;
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memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
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sizeof(udp6_addr.sin6_addr));
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udp6_addr.sin6_port = cfg->peer_udp_port;
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err = kernel_connect(sock,
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(struct sockaddr *)&udp6_addr,
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sizeof(udp6_addr), 0);
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}
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if (err < 0)
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goto error;
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udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
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udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
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*sockp = sock;
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return 0;
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error:
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if (sock) {
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kernel_sock_shutdown(sock, SHUT_RDWR);
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sock_release(sock);
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}
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*sockp = NULL;
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return err;
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}
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EXPORT_SYMBOL_GPL(udp_sock_create6);
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int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb,
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struct net_device *dev, struct in6_addr *saddr,
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struct in6_addr *daddr,
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__u8 prio, __u8 ttl, __be32 label,
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__be16 src_port, __be16 dst_port, bool nocheck)
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{
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struct udphdr *uh;
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struct ipv6hdr *ip6h;
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__skb_push(skb, sizeof(*uh));
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skb_reset_transport_header(skb);
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uh = udp_hdr(skb);
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uh->dest = dst_port;
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uh->source = src_port;
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uh->len = htons(skb->len);
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skb_dst_set(skb, dst);
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udp6_set_csum(nocheck, skb, saddr, daddr, skb->len);
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__skb_push(skb, sizeof(*ip6h));
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skb_reset_network_header(skb);
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ip6h = ipv6_hdr(skb);
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ip6_flow_hdr(ip6h, prio, label);
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ip6h->payload_len = htons(skb->len);
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ip6h->nexthdr = IPPROTO_UDP;
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ip6h->hop_limit = ttl;
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ip6h->daddr = *daddr;
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ip6h->saddr = *saddr;
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ip6tunnel_xmit(sk, skb, dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
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MODULE_LICENSE("GPL");
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