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 struct net_device *dev; 36 37 dev = dev_get_by_index(net, cfg->bind_ifindex); 38 if (!dev) { 39 err = -ENODEV; 40 goto error; 41 } 42 43 err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, 44 dev->name, strlen(dev->name) + 1); 45 dev_put(dev); 46 47 if (err < 0) 48 goto error; 49 } 50 51 udp6_addr.sin6_family = AF_INET6; 52 memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6, 53 sizeof(udp6_addr.sin6_addr)); 54 udp6_addr.sin6_port = cfg->local_udp_port; 55 err = kernel_bind(sock, (struct sockaddr *)&udp6_addr, 56 sizeof(udp6_addr)); 57 if (err < 0) 58 goto error; 59 60 if (cfg->peer_udp_port) { 61 udp6_addr.sin6_family = AF_INET6; 62 memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6, 63 sizeof(udp6_addr.sin6_addr)); 64 udp6_addr.sin6_port = cfg->peer_udp_port; 65 err = kernel_connect(sock, 66 (struct sockaddr *)&udp6_addr, 67 sizeof(udp6_addr), 0); 68 } 69 if (err < 0) 70 goto error; 71 72 udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums); 73 udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums); 74 75 *sockp = sock; 76 return 0; 77 78 error: 79 if (sock) { 80 kernel_sock_shutdown(sock, SHUT_RDWR); 81 sock_release(sock); 82 } 83 *sockp = NULL; 84 return err; 85 } 86 EXPORT_SYMBOL_GPL(udp_sock_create6); 87 88 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk, 89 struct sk_buff *skb, 90 struct net_device *dev, struct in6_addr *saddr, 91 struct in6_addr *daddr, 92 __u8 prio, __u8 ttl, __be32 label, 93 __be16 src_port, __be16 dst_port, bool nocheck) 94 { 95 struct udphdr *uh; 96 struct ipv6hdr *ip6h; 97 98 __skb_push(skb, sizeof(*uh)); 99 skb_reset_transport_header(skb); 100 uh = udp_hdr(skb); 101 102 uh->dest = dst_port; 103 uh->source = src_port; 104 105 uh->len = htons(skb->len); 106 107 skb_dst_set(skb, dst); 108 109 udp6_set_csum(nocheck, skb, saddr, daddr, skb->len); 110 111 __skb_push(skb, sizeof(*ip6h)); 112 skb_reset_network_header(skb); 113 ip6h = ipv6_hdr(skb); 114 ip6_flow_hdr(ip6h, prio, label); 115 ip6h->payload_len = htons(skb->len); 116 ip6h->nexthdr = IPPROTO_UDP; 117 ip6h->hop_limit = ttl; 118 ip6h->daddr = *daddr; 119 ip6h->saddr = *saddr; 120 121 ip6tunnel_xmit(sk, skb, dev); 122 return 0; 123 } 124 EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb); 125 126 MODULE_LICENSE("GPL"); 127