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