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 memset(&udp6_addr, 0, sizeof(udp6_addr)); 46 udp6_addr.sin6_family = AF_INET6; 47 memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6, 48 sizeof(udp6_addr.sin6_addr)); 49 udp6_addr.sin6_port = cfg->peer_udp_port; 50 err = kernel_connect(sock, 51 (struct sockaddr *)&udp6_addr, 52 sizeof(udp6_addr), 0); 53 } 54 if (err < 0) 55 goto error; 56 57 udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums); 58 udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums); 59 60 *sockp = sock; 61 return 0; 62 63 error: 64 if (sock) { 65 kernel_sock_shutdown(sock, SHUT_RDWR); 66 sock_release(sock); 67 } 68 *sockp = NULL; 69 return err; 70 } 71 EXPORT_SYMBOL_GPL(udp_sock_create6); 72 73 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk, 74 struct sk_buff *skb, 75 struct net_device *dev, struct in6_addr *saddr, 76 struct in6_addr *daddr, 77 __u8 prio, __u8 ttl, __be32 label, 78 __be16 src_port, __be16 dst_port, bool nocheck) 79 { 80 struct udphdr *uh; 81 struct ipv6hdr *ip6h; 82 83 __skb_push(skb, sizeof(*uh)); 84 skb_reset_transport_header(skb); 85 uh = udp_hdr(skb); 86 87 uh->dest = dst_port; 88 uh->source = src_port; 89 90 uh->len = htons(skb->len); 91 92 skb_dst_set(skb, dst); 93 94 udp6_set_csum(nocheck, skb, saddr, daddr, skb->len); 95 96 __skb_push(skb, sizeof(*ip6h)); 97 skb_reset_network_header(skb); 98 ip6h = ipv6_hdr(skb); 99 ip6_flow_hdr(ip6h, prio, label); 100 ip6h->payload_len = htons(skb->len); 101 ip6h->nexthdr = IPPROTO_UDP; 102 ip6h->hop_limit = ttl; 103 ip6h->daddr = *daddr; 104 ip6h->saddr = *saddr; 105 106 ip6tunnel_xmit(sk, skb, dev); 107 return 0; 108 } 109 EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb); 110 111 MODULE_LICENSE("GPL"); 112