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 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 71 error: 72 if (sock) { 73 kernel_sock_shutdown(sock, SHUT_RDWR); 74 sock_release(sock); 75 } 76 *sockp = NULL; 77 return err; 78 } 79 EXPORT_SYMBOL_GPL(udp_sock_create6); 80 81 int 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 } 117 EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb); 118 119 MODULE_LICENSE("GPL"); 120