net/ipv6/ip6_udp_tunnel.c

   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");