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