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         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");