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