LXR linux/net/ipv6/ip6_udp

   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
  15int 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(AF_INET6, SOCK_DGRAM, 0, &sock);
  23        if (err < 0)
  24                goto error;
  25
  26        sk_change_net(sock->sk, net);
  27
  28        udp6_addr.sin6_family = AF_INET6;
  29        memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
  30               sizeof(udp6_addr.sin6_addr));
  31        udp6_addr.sin6_port = cfg->local_udp_port;
  32        err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
  33                          sizeof(udp6_addr));
  34        if (err < 0)
  35                goto error;
  36
  37        if (cfg->peer_udp_port) {
  38                udp6_addr.sin6_family = AF_INET6;
  39                memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
  40                       sizeof(udp6_addr.sin6_addr));
  41                udp6_addr.sin6_port = cfg->peer_udp_port;
  42                err = kernel_connect(sock,
  43                                     (struct sockaddr *)&udp6_addr,
  44                                     sizeof(udp6_addr), 0);
  45        }
  46        if (err < 0)
  47                goto error;
  48
  49        udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
  50        udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
  51
  52        *sockp = sock;
  53        return 0;
  54
  55error:
  56        if (sock) {
  57                kernel_sock_shutdown(sock, SHUT_RDWR);
  58                sk_release_kernel(sock->sk);
  59        }
  60        *sockp = NULL;
  61        return err;
  62}
  63EXPORT_SYMBOL_GPL(udp_sock_create6);
  64
  65int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
  66                         struct sk_buff *skb,
  67                         struct net_device *dev, struct in6_addr *saddr,
  68                         struct in6_addr *daddr,
  69                         __u8 prio, __u8 ttl, __be16 src_port,
  70                         __be16 dst_port, bool nocheck)
  71{
  72        struct udphdr *uh;
  73        struct ipv6hdr *ip6h;
  74
  75        __skb_push(skb, sizeof(*uh));
  76        skb_reset_transport_header(skb);
  77        uh = udp_hdr(skb);
  78
  79        uh->dest = dst_port;
  80        uh->source = src_port;
  81
  82        uh->len = htons(skb->len);
  83
  84        memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
  85        IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
  86                            | IPSKB_REROUTED);
  87        skb_dst_set(skb, dst);
  88
  89        udp6_set_csum(nocheck, skb, saddr, daddr, skb->len);
  90
  91        __skb_push(skb, sizeof(*ip6h));
  92        skb_reset_network_header(skb);
  93        ip6h              = ipv6_hdr(skb);
  94        ip6_flow_hdr(ip6h, prio, htonl(0));
  95        ip6h->payload_len = htons(skb->len);
  96        ip6h->nexthdr     = IPPROTO_UDP;
  97        ip6h->hop_limit   = ttl;
  98        ip6h->daddr       = *daddr;
  99        ip6h->saddr       = *saddr;
 100
 101        ip6tunnel_xmit(sk, skb, dev);
 102        return 0;
 103}
 104EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
 105
 106MODULE_LICENSE("GPL");
 107