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TOMOYO Linux Cross Reference
Linux/net/ipv6/ip6_udp_tunnel.c

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

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