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3ae983a603
Commit 451ef36bd2
("ip_tunnels: Add new flow flags field to
ip_tunnel_key") added a new field to struct ip_tunnel_key to control
route lookups. Currently the flag is used by vxlan and geneve tunnels;
use it also in udp_tunnel_dst_lookup() so that it affects all tunnel
types relying on this function.
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
257 lines
6.3 KiB
C
257 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <net/dst_metadata.h>
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#include <net/udp.h>
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#include <net/udp_tunnel.h>
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int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp)
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{
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int err;
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struct socket *sock = NULL;
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struct sockaddr_in udp_addr;
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err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
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if (err < 0)
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goto error;
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if (cfg->bind_ifindex) {
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err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
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if (err < 0)
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goto error;
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}
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udp_addr.sin_family = AF_INET;
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udp_addr.sin_addr = cfg->local_ip;
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udp_addr.sin_port = cfg->local_udp_port;
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err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
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sizeof(udp_addr));
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if (err < 0)
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goto error;
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if (cfg->peer_udp_port) {
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udp_addr.sin_family = AF_INET;
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udp_addr.sin_addr = cfg->peer_ip;
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udp_addr.sin_port = cfg->peer_udp_port;
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err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
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sizeof(udp_addr), 0);
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if (err < 0)
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goto error;
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}
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sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
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*sockp = sock;
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return 0;
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error:
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if (sock) {
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kernel_sock_shutdown(sock, SHUT_RDWR);
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sock_release(sock);
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}
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*sockp = NULL;
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return err;
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}
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EXPORT_SYMBOL(udp_sock_create4);
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void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
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struct udp_tunnel_sock_cfg *cfg)
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{
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struct sock *sk = sock->sk;
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/* Disable multicast loopback */
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inet_clear_bit(MC_LOOP, sk);
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/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
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inet_inc_convert_csum(sk);
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rcu_assign_sk_user_data(sk, cfg->sk_user_data);
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udp_sk(sk)->encap_type = cfg->encap_type;
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udp_sk(sk)->encap_rcv = cfg->encap_rcv;
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udp_sk(sk)->encap_err_rcv = cfg->encap_err_rcv;
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udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup;
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udp_sk(sk)->encap_destroy = cfg->encap_destroy;
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udp_sk(sk)->gro_receive = cfg->gro_receive;
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udp_sk(sk)->gro_complete = cfg->gro_complete;
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udp_tunnel_encap_enable(sk);
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}
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EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
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void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
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unsigned short type)
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{
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struct sock *sk = sock->sk;
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struct udp_tunnel_info ti;
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ti.type = type;
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ti.sa_family = sk->sk_family;
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ti.port = inet_sk(sk)->inet_sport;
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udp_tunnel_nic_add_port(dev, &ti);
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port);
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void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
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unsigned short type)
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{
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struct sock *sk = sock->sk;
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struct udp_tunnel_info ti;
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ti.type = type;
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ti.sa_family = sk->sk_family;
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ti.port = inet_sk(sk)->inet_sport;
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udp_tunnel_nic_del_port(dev, &ti);
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);
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/* Notify netdevs that UDP port started listening */
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void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
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{
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struct sock *sk = sock->sk;
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struct net *net = sock_net(sk);
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struct udp_tunnel_info ti;
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struct net_device *dev;
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ti.type = type;
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ti.sa_family = sk->sk_family;
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ti.port = inet_sk(sk)->inet_sport;
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rcu_read_lock();
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for_each_netdev_rcu(net, dev) {
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udp_tunnel_nic_add_port(dev, &ti);
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);
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/* Notify netdevs that UDP port is no more listening */
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void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
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{
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struct sock *sk = sock->sk;
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struct net *net = sock_net(sk);
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struct udp_tunnel_info ti;
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struct net_device *dev;
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ti.type = type;
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ti.sa_family = sk->sk_family;
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ti.port = inet_sk(sk)->inet_sport;
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rcu_read_lock();
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for_each_netdev_rcu(net, dev) {
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udp_tunnel_nic_del_port(dev, &ti);
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);
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void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
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__be32 src, __be32 dst, __u8 tos, __u8 ttl,
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__be16 df, __be16 src_port, __be16 dst_port,
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bool xnet, bool nocheck)
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{
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struct udphdr *uh;
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__skb_push(skb, sizeof(*uh));
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skb_reset_transport_header(skb);
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uh = udp_hdr(skb);
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uh->dest = dst_port;
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uh->source = src_port;
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uh->len = htons(skb->len);
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memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
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udp_set_csum(nocheck, skb, src, dst, skb->len);
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iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
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void udp_tunnel_sock_release(struct socket *sock)
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{
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rcu_assign_sk_user_data(sock->sk, NULL);
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synchronize_rcu();
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kernel_sock_shutdown(sock, SHUT_RDWR);
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sock_release(sock);
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
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struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
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__be16 flags, __be64 tunnel_id, int md_size)
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{
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struct metadata_dst *tun_dst;
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struct ip_tunnel_info *info;
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if (family == AF_INET)
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tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
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else
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tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
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if (!tun_dst)
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return NULL;
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info = &tun_dst->u.tun_info;
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info->key.tp_src = udp_hdr(skb)->source;
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info->key.tp_dst = udp_hdr(skb)->dest;
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if (udp_hdr(skb)->check)
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info->key.tun_flags |= TUNNEL_CSUM;
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return tun_dst;
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}
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EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
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struct rtable *udp_tunnel_dst_lookup(struct sk_buff *skb,
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struct net_device *dev,
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struct net *net, int oif,
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__be32 *saddr,
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const struct ip_tunnel_key *key,
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__be16 sport, __be16 dport, u8 tos,
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struct dst_cache *dst_cache)
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{
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struct rtable *rt = NULL;
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struct flowi4 fl4;
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#ifdef CONFIG_DST_CACHE
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if (dst_cache) {
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rt = dst_cache_get_ip4(dst_cache, saddr);
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if (rt)
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return rt;
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}
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#endif
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memset(&fl4, 0, sizeof(fl4));
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fl4.flowi4_mark = skb->mark;
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fl4.flowi4_proto = IPPROTO_UDP;
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fl4.flowi4_oif = oif;
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fl4.daddr = key->u.ipv4.dst;
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fl4.saddr = key->u.ipv4.src;
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fl4.fl4_dport = dport;
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fl4.fl4_sport = sport;
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fl4.flowi4_tos = RT_TOS(tos);
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fl4.flowi4_flags = key->flow_flags;
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rt = ip_route_output_key(net, &fl4);
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if (IS_ERR(rt)) {
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netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr);
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return ERR_PTR(-ENETUNREACH);
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}
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if (rt->dst.dev == dev) { /* is this necessary? */
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netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr);
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ip_rt_put(rt);
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return ERR_PTR(-ELOOP);
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}
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#ifdef CONFIG_DST_CACHE
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if (dst_cache)
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dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
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#endif
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*saddr = fl4.saddr;
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return rt;
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_dst_lookup);
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MODULE_LICENSE("GPL");
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