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 if (cfg->bind_ifindex) { 35 err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTOIFINDEX, 36 (void *)&cfg->bind_ifindex, 37 sizeof(cfg->bind_ifindex)); 38 if (err < 0) 39 goto error; 40 } 41 42 udp6_addr.sin6_family = AF_INET6; 43 memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6, 44 sizeof(udp6_addr.sin6_addr)); 45 udp6_addr.sin6_port = cfg->local_udp_port; 46 err = kernel_bind(sock, (struct sockaddr *)&udp6_addr, 47 sizeof(udp6_addr)); 48 if (err < 0) 49 goto error; 50 51 if (cfg->peer_udp_port) { 52 memset(&udp6_addr, 0, sizeof(udp6_addr)); 53 udp6_addr.sin6_family = AF_INET6; 54 memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6, 55 sizeof(udp6_addr.sin6_addr)); 56 udp6_addr.sin6_port = cfg->peer_udp_port; 57 err = kernel_connect(sock, 58 (struct sockaddr *)&udp6_addr, 59 sizeof(udp6_addr), 0); 60 } 61 if (err < 0) 62 goto error; 63 64 udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums); 65 udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums); 66 67 *sockp = sock; 68 return 0; 69 70 error: 71 if (sock) { 72 kernel_sock_shutdown(sock, SHUT_RDWR); 73 sock_release(sock); 74 } 75 *sockp = NULL; 76 return err; 77 } 78 EXPORT_SYMBOL_GPL(udp_sock_create6); 79 80 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk, 81 struct sk_buff *skb, 82 struct net_device *dev, struct in6_addr *saddr, 83 struct in6_addr *daddr, 84 __u8 prio, __u8 ttl, __be32 label, 85 __be16 src_port, __be16 dst_port, bool nocheck) 86 { 87 struct udphdr *uh; 88 struct ipv6hdr *ip6h; 89 90 __skb_push(skb, sizeof(*uh)); 91 skb_reset_transport_header(skb); 92 uh = udp_hdr(skb); 93 94 uh->dest = dst_port; 95 uh->source = src_port; 96 97 uh->len = htons(skb->len); 98 99 skb_dst_set(skb, dst); 100 101 udp6_set_csum(nocheck, skb, saddr, daddr, skb->len); 102 103 __skb_push(skb, sizeof(*ip6h)); 104 skb_reset_network_header(skb); 105 ip6h = ipv6_hdr(skb); 106 ip6_flow_hdr(ip6h, prio, label); 107 ip6h->payload_len = htons(skb->len); 108 ip6h->nexthdr = IPPROTO_UDP; 109 ip6h->hop_limit = ttl; 110 ip6h->daddr = *daddr; 111 ip6h->saddr = *saddr; 112 113 ip6tunnel_xmit(sk, skb, dev); 114 return 0; 115 } 116 EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb); 117 118 MODULE_LICENSE("GPL"); 119