// SPDX-License-Identifier: GPL-2.0-only #include #include #include #include #include #include #include #include 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; if (cfg->bind_ifindex) { err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true); 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_clear_bit(MC_LOOP, sk); /* 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_err_rcv = cfg->encap_err_rcv; udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup; 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(sk); } EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock); void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock, unsigned short type) { struct sock *sk = sock->sk; struct udp_tunnel_info ti; ti.type = type; ti.sa_family = sk->sk_family; ti.port = inet_sk(sk)->inet_sport; udp_tunnel_nic_add_port(dev, &ti); } EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port); void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock, unsigned short type) { struct sock *sk = sock->sk; struct udp_tunnel_info ti; ti.type = type; ti.sa_family = sk->sk_family; ti.port = inet_sk(sk)->inet_sport; udp_tunnel_nic_del_port(dev, &ti); } EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port); /* Notify netdevs that UDP port started listening */ void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type) { struct sock *sk = sock->sk; struct net *net = sock_net(sk); struct udp_tunnel_info ti; struct net_device *dev; ti.type = type; ti.sa_family = sk->sk_family; ti.port = inet_sk(sk)->inet_sport; rcu_read_lock(); for_each_netdev_rcu(net, dev) { udp_tunnel_nic_add_port(dev, &ti); } rcu_read_unlock(); } EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port); /* Notify netdevs that UDP port is no more listening */ void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type) { struct sock *sk = sock->sk; struct net *net = sock_net(sk); struct udp_tunnel_info ti; struct net_device *dev; ti.type = type; ti.sa_family = sk->sk_family; ti.port = inet_sk(sk)->inet_sport; rcu_read_lock(); for_each_netdev_rcu(net, dev) { udp_tunnel_nic_del_port(dev, &ti); } rcu_read_unlock(); } EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port); 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); synchronize_rcu(); 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, const unsigned long *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) __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); return tun_dst; } EXPORT_SYMBOL_GPL(udp_tun_rx_dst); struct rtable *udp_tunnel_dst_lookup(struct sk_buff *skb, struct net_device *dev, struct net *net, int oif, __be32 *saddr, const struct ip_tunnel_key *key, __be16 sport, __be16 dport, u8 tos, struct dst_cache *dst_cache) { struct rtable *rt = NULL; struct flowi4 fl4; #ifdef CONFIG_DST_CACHE if (dst_cache) { rt = dst_cache_get_ip4(dst_cache, saddr); if (rt) return rt; } #endif memset(&fl4, 0, sizeof(fl4)); fl4.flowi4_mark = skb->mark; fl4.flowi4_proto = IPPROTO_UDP; fl4.flowi4_oif = oif; fl4.daddr = key->u.ipv4.dst; fl4.saddr = key->u.ipv4.src; fl4.fl4_dport = dport; fl4.fl4_sport = sport; fl4.flowi4_tos = tos & INET_DSCP_MASK; fl4.flowi4_flags = key->flow_flags; rt = ip_route_output_key(net, &fl4); if (IS_ERR(rt)) { netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr); return ERR_PTR(-ENETUNREACH); } if (rt->dst.dev == dev) { /* is this necessary? */ netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr); ip_rt_put(rt); return ERR_PTR(-ELOOP); } #ifdef CONFIG_DST_CACHE if (dst_cache) dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr); #endif *saddr = fl4.saddr; return rt; } EXPORT_SYMBOL_GPL(udp_tunnel_dst_lookup); MODULE_DESCRIPTION("IPv4 Foo over UDP tunnel driver"); MODULE_LICENSE("GPL");