1#include <linux/module.h> 2#include <linux/errno.h> 3#include <linux/socket.h> 4#include <linux/udp.h> 5#include <linux/types.h> 6#include <linux/kernel.h> 7#include <linux/in6.h> 8#include <net/udp.h> 9#include <net/udp_tunnel.h> 10#include <net/net_namespace.h> 11#include <net/netns/generic.h> 12#include <net/ip6_tunnel.h> 13#include <net/ip6_checksum.h> 14 15int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg, 16 struct socket **sockp) 17{ 18 struct sockaddr_in6 udp6_addr; 19 int err; 20 struct socket *sock = NULL; 21 22 err = sock_create_kern(AF_INET6, SOCK_DGRAM, 0, &sock); 23 if (err < 0) 24 goto error; 25 26 sk_change_net(sock->sk, net); 27 28 if (cfg->ipv6_v6only) { 29 int val = 1; 30 31 err = kernel_setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, 32 (char *) &val, sizeof(val)); 33 if (err < 0) 34 goto error; 35 } 36 37 udp6_addr.sin6_family = AF_INET6; 38 memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6, 39 sizeof(udp6_addr.sin6_addr)); 40 udp6_addr.sin6_port = cfg->local_udp_port; 41 err = kernel_bind(sock, (struct sockaddr *)&udp6_addr, 42 sizeof(udp6_addr)); 43 if (err < 0) 44 goto error; 45 46 if (cfg->peer_udp_port) { 47 udp6_addr.sin6_family = AF_INET6; 48 memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6, 49 sizeof(udp6_addr.sin6_addr)); 50 udp6_addr.sin6_port = cfg->peer_udp_port; 51 err = kernel_connect(sock, 52 (struct sockaddr *)&udp6_addr, 53 sizeof(udp6_addr), 0); 54 } 55 if (err < 0) 56 goto error; 57 58 udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums); 59 udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums); 60 61 *sockp = sock; 62 return 0; 63 64error: 65 if (sock) { 66 kernel_sock_shutdown(sock, SHUT_RDWR); 67 sk_release_kernel(sock->sk); 68 } 69 *sockp = NULL; 70 return err; 71} 72EXPORT_SYMBOL_GPL(udp_sock_create6); 73 74int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk, 75 struct sk_buff *skb, 76 struct net_device *dev, struct in6_addr *saddr, 77 struct in6_addr *daddr, 78 __u8 prio, __u8 ttl, __be32 label, 79 __be16 src_port, __be16 dst_port, bool nocheck) 80{ 81 struct udphdr *uh; 82 struct ipv6hdr *ip6h; 83 84 __skb_push(skb, sizeof(*uh)); 85 skb_reset_transport_header(skb); 86 uh = udp_hdr(skb); 87 88 uh->dest = dst_port; 89 uh->source = src_port; 90 91 uh->len = htons(skb->len); 92 93 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 94 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED 95 | IPSKB_REROUTED); 96 skb_dst_set(skb, dst); 97 98 udp6_set_csum(nocheck, skb, saddr, daddr, skb->len); 99 100 __skb_push(skb, sizeof(*ip6h)); 101 skb_reset_network_header(skb); 102 ip6h = ipv6_hdr(skb); 103 ip6_flow_hdr(ip6h, prio, label); 104 ip6h->payload_len = htons(skb->len); 105 ip6h->nexthdr = IPPROTO_UDP; 106 ip6h->hop_limit = ttl; 107 ip6h->daddr = *daddr; 108 ip6h->saddr = *saddr; 109 110 ip6tunnel_xmit(sk, skb, dev); 111 return 0; 112} 113EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb); 114 115MODULE_LICENSE("GPL"); 116