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(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
  63error:
  64        if (sock) {
  65                kernel_sock_shutdown(sock, SHUT_RDWR);
  66                sock_release(sock);
  67        }
  68        *sockp = NULL;
  69        return err;
  70}
  71EXPORT_SYMBOL_GPL(udp_sock_create6);
  72
  73int 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}
 109EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
 110
 111MODULE_LICENSE("GPL");
 112