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