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![Jakub Kicinski](/assets/img/avatar_default.png)
Move the NETIF_F_RX_UDP_TUNNEL_PORT feature check into udp_tunnel_nic_*_port() helpers, since they're always done right before the call. Add similar checks before calling the notifier. udp_tunnel_nic invokes the notifier without checking features which could result in some wasted cycles. Reviewed-by: Alexander Duyck <alexanderduyck@fb.com> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
208 lines
5.1 KiB
C
208 lines
5.1 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/udp.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <net/dst_metadata.h>
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#include <net/net_namespace.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_sk(sk)->mc_loop = 0;
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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_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(sock);
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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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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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MODULE_LICENSE("GPL");
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