133 строки
3.2 KiB
C
133 строки
3.2 KiB
C
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <net/dst_metadata.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/udp.h>
|
|
#include <net/udp_tunnel.h>
|
|
|
|
int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
|
|
struct socket **sockp)
|
|
{
|
|
int err;
|
|
struct socket *sock = NULL;
|
|
struct sockaddr_in udp_addr;
|
|
|
|
err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
udp_addr.sin_family = AF_INET;
|
|
udp_addr.sin_addr = cfg->local_ip;
|
|
udp_addr.sin_port = cfg->local_udp_port;
|
|
err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
|
|
sizeof(udp_addr));
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
if (cfg->peer_udp_port) {
|
|
udp_addr.sin_family = AF_INET;
|
|
udp_addr.sin_addr = cfg->peer_ip;
|
|
udp_addr.sin_port = cfg->peer_udp_port;
|
|
err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
|
|
sizeof(udp_addr), 0);
|
|
if (err < 0)
|
|
goto error;
|
|
}
|
|
|
|
sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
|
|
|
|
*sockp = sock;
|
|
return 0;
|
|
|
|
error:
|
|
if (sock) {
|
|
kernel_sock_shutdown(sock, SHUT_RDWR);
|
|
sock_release(sock);
|
|
}
|
|
*sockp = NULL;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(udp_sock_create4);
|
|
|
|
void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
|
|
struct udp_tunnel_sock_cfg *cfg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
/* Disable multicast loopback */
|
|
inet_sk(sk)->mc_loop = 0;
|
|
|
|
/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
|
|
inet_inc_convert_csum(sk);
|
|
|
|
rcu_assign_sk_user_data(sk, cfg->sk_user_data);
|
|
|
|
udp_sk(sk)->encap_type = cfg->encap_type;
|
|
udp_sk(sk)->encap_rcv = cfg->encap_rcv;
|
|
udp_sk(sk)->encap_destroy = cfg->encap_destroy;
|
|
udp_sk(sk)->gro_receive = cfg->gro_receive;
|
|
udp_sk(sk)->gro_complete = cfg->gro_complete;
|
|
|
|
udp_tunnel_encap_enable(sock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
|
|
|
|
void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
|
|
__be32 src, __be32 dst, __u8 tos, __u8 ttl,
|
|
__be16 df, __be16 src_port, __be16 dst_port,
|
|
bool xnet, bool nocheck)
|
|
{
|
|
struct udphdr *uh;
|
|
|
|
__skb_push(skb, sizeof(*uh));
|
|
skb_reset_transport_header(skb);
|
|
uh = udp_hdr(skb);
|
|
|
|
uh->dest = dst_port;
|
|
uh->source = src_port;
|
|
uh->len = htons(skb->len);
|
|
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
|
|
|
udp_set_csum(nocheck, skb, src, dst, skb->len);
|
|
|
|
iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
|
|
|
|
void udp_tunnel_sock_release(struct socket *sock)
|
|
{
|
|
rcu_assign_sk_user_data(sock->sk, NULL);
|
|
kernel_sock_shutdown(sock, SHUT_RDWR);
|
|
sock_release(sock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
|
|
|
|
struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
|
|
__be16 flags, __be64 tunnel_id, int md_size)
|
|
{
|
|
struct metadata_dst *tun_dst;
|
|
struct ip_tunnel_info *info;
|
|
|
|
if (family == AF_INET)
|
|
tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
|
|
else
|
|
tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
|
|
if (!tun_dst)
|
|
return NULL;
|
|
|
|
info = &tun_dst->u.tun_info;
|
|
info->key.tp_src = udp_hdr(skb)->source;
|
|
info->key.tp_dst = udp_hdr(skb)->dest;
|
|
if (udp_hdr(skb)->check)
|
|
info->key.tun_flags |= TUNNEL_CSUM;
|
|
return tun_dst;
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
|
|
|
|
MODULE_LICENSE("GPL");
|