net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.
The Bareudp tunnel module provides a generic L3 encapsulation tunnelling module for tunnelling different protocols like MPLS, IP,NSH etc inside a UDP tunnel. Signed-off-by: Martin Varghese <martin.varghese@nokia.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin Varghese
David S. Miller
parent
48851e9e80
commit
571912c69f
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@ -0,0 +1,34 @@
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.. SPDX-License-Identifier: GPL-2.0
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========================================
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Bare UDP Tunnelling Module Documentation
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========================================
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There are various L3 encapsulation standards using UDP being discussed to
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leverage the UDP based load balancing capability of different networks.
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MPLSoUDP (__ https://tools.ietf.org/html/rfc7510) is one among them.
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The Bareudp tunnel module provides a generic L3 encapsulation tunnelling
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support for tunnelling different L3 protocols like MPLS, IP, NSH etc. inside
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a UDP tunnel.
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Usage
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------
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1) Device creation & deletion
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a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847.
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This creates a bareudp tunnel device which tunnels L3 traffic with ethertype
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0x8847 (MPLS traffic). The destination port of the UDP header will be set to
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6635.The device will listen on UDP port 6635 to receive traffic.
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b) ip link delete bareudp0
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2) Device Usage
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The bareudp device could be used along with OVS or flower filter in TC.
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The OVS or TC flower layer must set the tunnel information in SKB dst field before
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sending packet buffer to the bareudp device for transmission. On reception the
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bareudp device extracts and stores the tunnel information in SKB dst field before
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passing the packet buffer to the network stack.
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@ -8,6 +8,7 @@ Contents:
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netdev-FAQ
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af_xdp
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bareudp
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batman-adv
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can
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can_ucan_protocol
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@ -258,6 +258,19 @@ config GENEVE
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To compile this driver as a module, choose M here: the module
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will be called geneve.
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config BAREUDP
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tristate "Bare UDP Encapsulation"
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depends on INET
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depends on IPV6 || !IPV6
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select NET_UDP_TUNNEL
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select GRO_CELLS
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help
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This adds a bare UDP tunnel module for tunnelling different
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kinds of traffic like MPLS, IP, etc. inside a UDP tunnel.
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To compile this driver as a module, choose M here: the module
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will be called bareudp.
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config GTP
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tristate "GPRS Tunneling Protocol datapath (GTP-U)"
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depends on INET
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@ -29,6 +29,7 @@ obj-$(CONFIG_VETH) += veth.o
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obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
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obj-$(CONFIG_VXLAN) += vxlan.o
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obj-$(CONFIG_GENEVE) += geneve.o
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obj-$(CONFIG_BAREUDP) += bareudp.o
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obj-$(CONFIG_GTP) += gtp.o
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obj-$(CONFIG_NLMON) += nlmon.o
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obj-$(CONFIG_NET_VRF) += vrf.o
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@ -0,0 +1,743 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Bareudp: UDP tunnel encasulation for different Payload types like
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* MPLS, NSH, IP, etc.
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* Copyright (c) 2019 Nokia, Inc.
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* Authors: Martin Varghese, <martin.varghese@nokia.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/etherdevice.h>
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#include <linux/hash.h>
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#include <net/dst_metadata.h>
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#include <net/gro_cells.h>
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#include <net/rtnetlink.h>
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#include <net/protocol.h>
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#include <net/ip6_tunnel.h>
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#include <net/ip_tunnels.h>
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#include <net/udp_tunnel.h>
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#include <net/bareudp.h>
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#define BAREUDP_BASE_HLEN sizeof(struct udphdr)
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#define BAREUDP_IPV4_HLEN (sizeof(struct iphdr) + \
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sizeof(struct udphdr))
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#define BAREUDP_IPV6_HLEN (sizeof(struct ipv6hdr) + \
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sizeof(struct udphdr))
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static bool log_ecn_error = true;
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module_param(log_ecn_error, bool, 0644);
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MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
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/* per-network namespace private data for this module */
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static unsigned int bareudp_net_id;
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struct bareudp_net {
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struct list_head bareudp_list;
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};
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/* Pseudo network device */
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struct bareudp_dev {
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struct net *net; /* netns for packet i/o */
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struct net_device *dev; /* netdev for bareudp tunnel */
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__be16 ethertype;
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__be16 port;
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u16 sport_min;
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struct socket __rcu *sock;
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struct list_head next; /* bareudp node on namespace list */
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struct gro_cells gro_cells;
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};
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static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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{
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struct metadata_dst *tun_dst = NULL;
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struct pcpu_sw_netstats *stats;
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struct bareudp_dev *bareudp;
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unsigned short family;
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unsigned int len;
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__be16 proto;
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void *oiph;
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int err;
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bareudp = rcu_dereference_sk_user_data(sk);
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if (!bareudp)
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goto drop;
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if (skb->protocol == htons(ETH_P_IP))
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family = AF_INET;
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else
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family = AF_INET6;
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proto = bareudp->ethertype;
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if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN,
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proto,
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!net_eq(bareudp->net,
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dev_net(bareudp->dev)))) {
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bareudp->dev->stats.rx_dropped++;
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goto drop;
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}
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tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
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if (!tun_dst) {
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bareudp->dev->stats.rx_dropped++;
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goto drop;
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}
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skb_dst_set(skb, &tun_dst->dst);
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skb->dev = bareudp->dev;
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oiph = skb_network_header(skb);
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skb_reset_network_header(skb);
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if (family == AF_INET)
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err = IP_ECN_decapsulate(oiph, skb);
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#if IS_ENABLED(CONFIG_IPV6)
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else
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err = IP6_ECN_decapsulate(oiph, skb);
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#endif
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if (unlikely(err)) {
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if (log_ecn_error) {
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if (family == AF_INET)
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net_info_ratelimited("non-ECT from %pI4 "
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"with TOS=%#x\n",
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&((struct iphdr *)oiph)->saddr,
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((struct iphdr *)oiph)->tos);
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#if IS_ENABLED(CONFIG_IPV6)
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else
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net_info_ratelimited("non-ECT from %pI6\n",
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&((struct ipv6hdr *)oiph)->saddr);
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#endif
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}
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if (err > 1) {
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++bareudp->dev->stats.rx_frame_errors;
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++bareudp->dev->stats.rx_errors;
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goto drop;
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}
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}
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len = skb->len;
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err = gro_cells_receive(&bareudp->gro_cells, skb);
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if (likely(err == NET_RX_SUCCESS)) {
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stats = this_cpu_ptr(bareudp->dev->tstats);
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u64_stats_update_begin(&stats->syncp);
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stats->rx_packets++;
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stats->rx_bytes += len;
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u64_stats_update_end(&stats->syncp);
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}
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return 0;
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drop:
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/* Consume bad packet */
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kfree_skb(skb);
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return 0;
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}
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static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb)
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{
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return 0;
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}
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static int bareudp_init(struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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int err;
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dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
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if (!dev->tstats)
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return -ENOMEM;
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err = gro_cells_init(&bareudp->gro_cells, dev);
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if (err) {
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free_percpu(dev->tstats);
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return err;
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}
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return 0;
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}
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static void bareudp_uninit(struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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gro_cells_destroy(&bareudp->gro_cells);
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free_percpu(dev->tstats);
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}
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static struct socket *bareudp_create_sock(struct net *net, __be16 port)
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{
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struct udp_port_cfg udp_conf;
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struct socket *sock;
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int err;
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memset(&udp_conf, 0, sizeof(udp_conf));
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#if IS_ENABLED(CONFIG_IPV6)
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udp_conf.family = AF_INET6;
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#else
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udp_conf.family = AF_INET;
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#endif
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udp_conf.local_udp_port = port;
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/* Open UDP socket */
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err = udp_sock_create(net, &udp_conf, &sock);
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if (err < 0)
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return ERR_PTR(err);
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return sock;
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}
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/* Create new listen socket if needed */
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static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port)
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{
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struct udp_tunnel_sock_cfg tunnel_cfg;
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struct socket *sock;
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sock = bareudp_create_sock(bareudp->net, port);
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if (IS_ERR(sock))
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return PTR_ERR(sock);
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/* Mark socket as an encapsulation socket */
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memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
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tunnel_cfg.sk_user_data = bareudp;
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tunnel_cfg.encap_type = 1;
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tunnel_cfg.encap_rcv = bareudp_udp_encap_recv;
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tunnel_cfg.encap_err_lookup = bareudp_err_lookup;
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tunnel_cfg.encap_destroy = NULL;
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setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg);
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if (sock->sk->sk_family == AF_INET6)
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udp_encap_enable();
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rcu_assign_pointer(bareudp->sock, sock);
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return 0;
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}
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static int bareudp_open(struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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int ret = 0;
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ret = bareudp_socket_create(bareudp, bareudp->port);
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return ret;
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}
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static void bareudp_sock_release(struct bareudp_dev *bareudp)
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{
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struct socket *sock;
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sock = bareudp->sock;
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rcu_assign_pointer(bareudp->sock, NULL);
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synchronize_net();
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udp_tunnel_sock_release(sock);
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}
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static int bareudp_stop(struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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bareudp_sock_release(bareudp);
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return 0;
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}
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static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
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struct bareudp_dev *bareudp,
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const struct ip_tunnel_info *info)
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{
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bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
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bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
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struct socket *sock = rcu_dereference(bareudp->sock);
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bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
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const struct ip_tunnel_key *key = &info->key;
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struct rtable *rt;
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__be16 sport, df;
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int min_headroom;
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__u8 tos, ttl;
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__be32 saddr;
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int err;
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if (!sock)
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return -ESHUTDOWN;
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rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info,
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IPPROTO_UDP, use_cache);
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if (IS_ERR(rt))
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return PTR_ERR(rt);
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skb_tunnel_check_pmtu(skb, &rt->dst,
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BAREUDP_IPV4_HLEN + info->options_len);
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sport = udp_flow_src_port(bareudp->net, skb,
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bareudp->sport_min, USHRT_MAX,
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true);
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tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
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ttl = key->ttl;
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df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
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skb_scrub_packet(skb, xnet);
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if (!skb_pull(skb, skb_network_offset(skb)))
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goto free_dst;
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min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
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BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
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err = skb_cow_head(skb, min_headroom);
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if (unlikely(err))
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goto free_dst;
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err = udp_tunnel_handle_offloads(skb, udp_sum);
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if (err)
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goto free_dst;
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skb_set_inner_protocol(skb, bareudp->ethertype);
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udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst,
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tos, ttl, df, sport, bareudp->port,
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!net_eq(bareudp->net, dev_net(bareudp->dev)),
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!(info->key.tun_flags & TUNNEL_CSUM));
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return 0;
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free_dst:
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dst_release(&rt->dst);
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return err;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
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struct bareudp_dev *bareudp,
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const struct ip_tunnel_info *info)
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{
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bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
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bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
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struct socket *sock = rcu_dereference(bareudp->sock);
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bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
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const struct ip_tunnel_key *key = &info->key;
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struct dst_entry *dst = NULL;
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struct in6_addr saddr, daddr;
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int min_headroom;
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__u8 prio, ttl;
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__be16 sport;
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int err;
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if (!sock)
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return -ESHUTDOWN;
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dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info,
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IPPROTO_UDP, use_cache);
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if (IS_ERR(dst))
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return PTR_ERR(dst);
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skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len);
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sport = udp_flow_src_port(bareudp->net, skb,
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bareudp->sport_min, USHRT_MAX,
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true);
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prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
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ttl = key->ttl;
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skb_scrub_packet(skb, xnet);
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if (!skb_pull(skb, skb_network_offset(skb)))
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goto free_dst;
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min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
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BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
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err = skb_cow_head(skb, min_headroom);
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if (unlikely(err))
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goto free_dst;
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err = udp_tunnel_handle_offloads(skb, udp_sum);
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if (err)
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goto free_dst;
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daddr = info->key.u.ipv6.dst;
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udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev,
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&saddr, &daddr, prio, ttl,
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info->key.label, sport, bareudp->port,
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!(info->key.tun_flags & TUNNEL_CSUM));
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return 0;
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free_dst:
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dst_release(dst);
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return err;
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}
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#endif
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static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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struct ip_tunnel_info *info = NULL;
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int err;
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if (skb->protocol != bareudp->ethertype) {
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err = -EINVAL;
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goto tx_error;
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}
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info = skb_tunnel_info(skb);
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if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
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err = -EINVAL;
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goto tx_error;
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}
|
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rcu_read_lock();
|
||||
#if IS_ENABLED(CONFIG_IPV6)
|
||||
if (info->mode & IP_TUNNEL_INFO_IPV6)
|
||||
err = bareudp6_xmit_skb(skb, dev, bareudp, info);
|
||||
else
|
||||
#endif
|
||||
err = bareudp_xmit_skb(skb, dev, bareudp, info);
|
||||
|
||||
rcu_read_unlock();
|
||||
|
||||
if (likely(!err))
|
||||
return NETDEV_TX_OK;
|
||||
tx_error:
|
||||
dev_kfree_skb(skb);
|
||||
|
||||
if (err == -ELOOP)
|
||||
dev->stats.collisions++;
|
||||
else if (err == -ENETUNREACH)
|
||||
dev->stats.tx_carrier_errors++;
|
||||
|
||||
dev->stats.tx_errors++;
|
||||
return NETDEV_TX_OK;
|
||||
}
|
||||
|
||||
static int bareudp_fill_metadata_dst(struct net_device *dev,
|
||||
struct sk_buff *skb)
|
||||
{
|
||||
struct ip_tunnel_info *info = skb_tunnel_info(skb);
|
||||
struct bareudp_dev *bareudp = netdev_priv(dev);
|
||||
bool use_cache;
|
||||
|
||||
use_cache = ip_tunnel_dst_cache_usable(skb, info);
|
||||
|
||||
if (ip_tunnel_info_af(info) == AF_INET) {
|
||||
struct rtable *rt;
|
||||
__be32 saddr;
|
||||
|
||||
rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr,
|
||||
info, IPPROTO_UDP, use_cache);
|
||||
if (IS_ERR(rt))
|
||||
return PTR_ERR(rt);
|
||||
|
||||
ip_rt_put(rt);
|
||||
info->key.u.ipv4.src = saddr;
|
||||
#if IS_ENABLED(CONFIG_IPV6)
|
||||
} else if (ip_tunnel_info_af(info) == AF_INET6) {
|
||||
struct dst_entry *dst;
|
||||
struct in6_addr saddr;
|
||||
struct socket *sock = rcu_dereference(bareudp->sock);
|
||||
|
||||
dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
|
||||
&saddr, info, IPPROTO_UDP,
|
||||
use_cache);
|
||||
if (IS_ERR(dst))
|
||||
return PTR_ERR(dst);
|
||||
|
||||
dst_release(dst);
|
||||
info->key.u.ipv6.src = saddr;
|
||||
#endif
|
||||
} else {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
info->key.tp_src = udp_flow_src_port(bareudp->net, skb,
|
||||
bareudp->sport_min,
|
||||
USHRT_MAX, true);
|
||||
info->key.tp_dst = bareudp->port;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct net_device_ops bareudp_netdev_ops = {
|
||||
.ndo_init = bareudp_init,
|
||||
.ndo_uninit = bareudp_uninit,
|
||||
.ndo_open = bareudp_open,
|
||||
.ndo_stop = bareudp_stop,
|
||||
.ndo_start_xmit = bareudp_xmit,
|
||||
.ndo_get_stats64 = ip_tunnel_get_stats64,
|
||||
.ndo_fill_metadata_dst = bareudp_fill_metadata_dst,
|
||||
};
|
||||
|
||||
static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
|
||||
[IFLA_BAREUDP_PORT] = { .type = NLA_U16 },
|
||||
[IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 },
|
||||
[IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 },
|
||||
};
|
||||
|
||||
/* Info for udev, that this is a virtual tunnel endpoint */
|
||||
static struct device_type bareudp_type = {
|
||||
.name = "bareudp",
|
||||
};
|
||||
|
||||
/* Initialize the device structure. */
|
||||
static void bareudp_setup(struct net_device *dev)
|
||||
{
|
||||
dev->netdev_ops = &bareudp_netdev_ops;
|
||||
dev->needs_free_netdev = true;
|
||||
SET_NETDEV_DEVTYPE(dev, &bareudp_type);
|
||||
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
|
||||
dev->features |= NETIF_F_RXCSUM;
|
||||
dev->features |= NETIF_F_GSO_SOFTWARE;
|
||||
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
|
||||
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
|
||||
dev->hard_header_len = 0;
|
||||
dev->addr_len = 0;
|
||||
dev->mtu = ETH_DATA_LEN;
|
||||
dev->min_mtu = IPV4_MIN_MTU;
|
||||
dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
|
||||
dev->type = ARPHRD_NONE;
|
||||
netif_keep_dst(dev);
|
||||
dev->priv_flags |= IFF_NO_QUEUE;
|
||||
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
|
||||
}
|
||||
|
||||
static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
|
||||
struct netlink_ext_ack *extack)
|
||||
{
|
||||
if (!data) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"Not enough attributes provided to perform the operation");
|
||||
return -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf)
|
||||
{
|
||||
if (!data[IFLA_BAREUDP_PORT] || !data[IFLA_BAREUDP_ETHERTYPE])
|
||||
return -EINVAL;
|
||||
|
||||
if (data[IFLA_BAREUDP_PORT])
|
||||
conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]);
|
||||
|
||||
if (data[IFLA_BAREUDP_ETHERTYPE])
|
||||
conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
|
||||
|
||||
if (data[IFLA_BAREUDP_SRCPORT_MIN])
|
||||
conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
|
||||
const struct bareudp_conf *conf)
|
||||
{
|
||||
struct bareudp_dev *bareudp, *t = NULL;
|
||||
|
||||
list_for_each_entry(bareudp, &bn->bareudp_list, next) {
|
||||
if (conf->port == bareudp->port)
|
||||
t = bareudp;
|
||||
}
|
||||
return t;
|
||||
}
|
||||
|
||||
static int bareudp_configure(struct net *net, struct net_device *dev,
|
||||
struct bareudp_conf *conf)
|
||||
{
|
||||
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
|
||||
struct bareudp_dev *t, *bareudp = netdev_priv(dev);
|
||||
int err;
|
||||
|
||||
bareudp->net = net;
|
||||
bareudp->dev = dev;
|
||||
t = bareudp_find_dev(bn, conf);
|
||||
if (t)
|
||||
return -EBUSY;
|
||||
|
||||
bareudp->port = conf->port;
|
||||
bareudp->ethertype = conf->ethertype;
|
||||
bareudp->sport_min = conf->sport_min;
|
||||
err = register_netdevice(dev);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
list_add(&bareudp->next, &bn->bareudp_list);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bareudp_link_config(struct net_device *dev,
|
||||
struct nlattr *tb[])
|
||||
{
|
||||
int err;
|
||||
|
||||
if (tb[IFLA_MTU]) {
|
||||
err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bareudp_newlink(struct net *net, struct net_device *dev,
|
||||
struct nlattr *tb[], struct nlattr *data[],
|
||||
struct netlink_ext_ack *extack)
|
||||
{
|
||||
struct bareudp_conf conf;
|
||||
int err;
|
||||
|
||||
err = bareudp2info(data, &conf);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = bareudp_configure(net, dev, &conf);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = bareudp_link_config(dev, tb);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void bareudp_dellink(struct net_device *dev, struct list_head *head)
|
||||
{
|
||||
struct bareudp_dev *bareudp = netdev_priv(dev);
|
||||
|
||||
list_del(&bareudp->next);
|
||||
unregister_netdevice_queue(dev, head);
|
||||
}
|
||||
|
||||
static size_t bareudp_get_size(const struct net_device *dev)
|
||||
{
|
||||
return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */
|
||||
nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */
|
||||
nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */
|
||||
0;
|
||||
}
|
||||
|
||||
static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
||||
{
|
||||
struct bareudp_dev *bareudp = netdev_priv(dev);
|
||||
|
||||
if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port))
|
||||
goto nla_put_failure;
|
||||
if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype))
|
||||
goto nla_put_failure;
|
||||
if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min))
|
||||
goto nla_put_failure;
|
||||
|
||||
return 0;
|
||||
|
||||
nla_put_failure:
|
||||
return -EMSGSIZE;
|
||||
}
|
||||
|
||||
static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
|
||||
.kind = "bareudp",
|
||||
.maxtype = IFLA_BAREUDP_MAX,
|
||||
.policy = bareudp_policy,
|
||||
.priv_size = sizeof(struct bareudp_dev),
|
||||
.setup = bareudp_setup,
|
||||
.validate = bareudp_validate,
|
||||
.newlink = bareudp_newlink,
|
||||
.dellink = bareudp_dellink,
|
||||
.get_size = bareudp_get_size,
|
||||
.fill_info = bareudp_fill_info,
|
||||
};
|
||||
|
||||
struct net_device *bareudp_dev_create(struct net *net, const char *name,
|
||||
u8 name_assign_type,
|
||||
struct bareudp_conf *conf)
|
||||
{
|
||||
struct nlattr *tb[IFLA_MAX + 1];
|
||||
struct net_device *dev;
|
||||
LIST_HEAD(list_kill);
|
||||
int err;
|
||||
|
||||
memset(tb, 0, sizeof(tb));
|
||||
dev = rtnl_create_link(net, name, name_assign_type,
|
||||
&bareudp_link_ops, tb, NULL);
|
||||
if (IS_ERR(dev))
|
||||
return dev;
|
||||
|
||||
err = bareudp_configure(net, dev, conf);
|
||||
if (err) {
|
||||
free_netdev(dev);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN);
|
||||
if (err)
|
||||
goto err;
|
||||
|
||||
err = rtnl_configure_link(dev, NULL);
|
||||
if (err < 0)
|
||||
goto err;
|
||||
|
||||
return dev;
|
||||
err:
|
||||
bareudp_dellink(dev, &list_kill);
|
||||
unregister_netdevice_many(&list_kill);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(bareudp_dev_create);
|
||||
|
||||
static __net_init int bareudp_init_net(struct net *net)
|
||||
{
|
||||
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
|
||||
|
||||
INIT_LIST_HEAD(&bn->bareudp_list);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
|
||||
{
|
||||
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
|
||||
struct bareudp_dev *bareudp, *next;
|
||||
|
||||
list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
|
||||
unregister_netdevice_queue(bareudp->dev, head);
|
||||
}
|
||||
|
||||
static void __net_exit bareudp_exit_batch_net(struct list_head *net_list)
|
||||
{
|
||||
struct net *net;
|
||||
LIST_HEAD(list);
|
||||
|
||||
rtnl_lock();
|
||||
list_for_each_entry(net, net_list, exit_list)
|
||||
bareudp_destroy_tunnels(net, &list);
|
||||
|
||||
/* unregister the devices gathered above */
|
||||
unregister_netdevice_many(&list);
|
||||
rtnl_unlock();
|
||||
}
|
||||
|
||||
static struct pernet_operations bareudp_net_ops = {
|
||||
.init = bareudp_init_net,
|
||||
.exit_batch = bareudp_exit_batch_net,
|
||||
.id = &bareudp_net_id,
|
||||
.size = sizeof(struct bareudp_net),
|
||||
};
|
||||
|
||||
static int __init bareudp_init_module(void)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = register_pernet_subsys(&bareudp_net_ops);
|
||||
if (rc)
|
||||
goto out1;
|
||||
|
||||
rc = rtnl_link_register(&bareudp_link_ops);
|
||||
if (rc)
|
||||
goto out2;
|
||||
|
||||
return 0;
|
||||
out2:
|
||||
unregister_pernet_subsys(&bareudp_net_ops);
|
||||
out1:
|
||||
return rc;
|
||||
}
|
||||
late_initcall(bareudp_init_module);
|
||||
|
||||
static void __exit bareudp_cleanup_module(void)
|
||||
{
|
||||
rtnl_link_unregister(&bareudp_link_ops);
|
||||
unregister_pernet_subsys(&bareudp_net_ops);
|
||||
}
|
||||
module_exit(bareudp_cleanup_module);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
|
||||
MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");
|
||||
|
|
@ -0,0 +1,19 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
#ifndef __NET_BAREUDP_H
|
||||
#define __NET_BAREUDP_H
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/skbuff.h>
|
||||
|
||||
struct bareudp_conf {
|
||||
__be16 ethertype;
|
||||
__be16 port;
|
||||
u16 sport_min;
|
||||
};
|
||||
|
||||
struct net_device *bareudp_dev_create(struct net *net, const char *name,
|
||||
u8 name_assign_type,
|
||||
struct bareudp_conf *info);
|
||||
|
||||
#endif
|
||||
|
|
@ -1027,6 +1027,12 @@ struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, st
|
|||
struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
|
||||
const struct in6_addr *final_dst,
|
||||
bool connected);
|
||||
struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
|
||||
struct net_device *dev,
|
||||
struct net *net, struct socket *sock,
|
||||
struct in6_addr *saddr,
|
||||
const struct ip_tunnel_info *info,
|
||||
u8 protocol, bool use_cache);
|
||||
struct dst_entry *ip6_blackhole_route(struct net *net,
|
||||
struct dst_entry *orig_dst);
|
||||
|
||||
|
|
|
|||
|
|
@ -128,6 +128,12 @@ static inline struct rtable *__ip_route_output_key(struct net *net,
|
|||
|
||||
struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
|
||||
const struct sock *sk);
|
||||
struct rtable *ip_route_output_tunnel(struct sk_buff *skb,
|
||||
struct net_device *dev,
|
||||
struct net *net, __be32 *saddr,
|
||||
const struct ip_tunnel_info *info,
|
||||
u8 protocol, bool use_cache);
|
||||
|
||||
struct dst_entry *ipv4_blackhole_route(struct net *net,
|
||||
struct dst_entry *dst_orig);
|
||||
|
||||
|
|
|
|||
|
|
@ -590,6 +590,17 @@ enum ifla_geneve_df {
|
|||
GENEVE_DF_MAX = __GENEVE_DF_END - 1,
|
||||
};
|
||||
|
||||
/* Bareudp section */
|
||||
enum {
|
||||
IFLA_BAREUDP_UNSPEC,
|
||||
IFLA_BAREUDP_PORT,
|
||||
IFLA_BAREUDP_ETHERTYPE,
|
||||
IFLA_BAREUDP_SRCPORT_MIN,
|
||||
__IFLA_BAREUDP_MAX
|
||||
};
|
||||
|
||||
#define IFLA_BAREUDP_MAX (__IFLA_BAREUDP_MAX - 1)
|
||||
|
||||
/* PPP section */
|
||||
enum {
|
||||
IFLA_PPP_UNSPEC,
|
||||
|
|
|
|||
|
|
@ -2774,6 +2774,54 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(ip_route_output_flow);
|
||||
|
||||
struct rtable *ip_route_output_tunnel(struct sk_buff *skb,
|
||||
struct net_device *dev,
|
||||
struct net *net, __be32 *saddr,
|
||||
const struct ip_tunnel_info *info,
|
||||
u8 protocol, bool use_cache)
|
||||
{
|
||||
#ifdef CONFIG_DST_CACHE
|
||||
struct dst_cache *dst_cache;
|
||||
#endif
|
||||
struct rtable *rt = NULL;
|
||||
struct flowi4 fl4;
|
||||
__u8 tos;
|
||||
|
||||
#ifdef CONFIG_DST_CACHE
|
||||
dst_cache = (struct dst_cache *)&info->dst_cache;
|
||||
if (use_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 = protocol;
|
||||
fl4.daddr = info->key.u.ipv4.dst;
|
||||
fl4.saddr = info->key.u.ipv4.src;
|
||||
tos = info->key.tos;
|
||||
fl4.flowi4_tos = RT_TOS(tos);
|
||||
|
||||
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 (use_cache)
|
||||
dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
|
||||
#endif
|
||||
*saddr = fl4.saddr;
|
||||
return rt;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ip_route_output_tunnel);
|
||||
|
||||
/* called with rcu_read_lock held */
|
||||
static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
|
||||
struct rtable *rt, u32 table_id, struct flowi4 *fl4,
|
||||
|
|
|
|||
|
|
@ -54,6 +54,7 @@
|
|||
#include <linux/mroute6.h>
|
||||
#include <net/l3mdev.h>
|
||||
#include <net/lwtunnel.h>
|
||||
#include <net/ip_tunnels.h>
|
||||
|
||||
static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
|
||||
{
|
||||
|
|
@ -1196,6 +1197,75 @@ struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
|
||||
|
||||
/**
|
||||
* ip6_dst_lookup_tunnel - perform route lookup on tunnel
|
||||
* @skb: Packet for which lookup is done
|
||||
* @dev: Tunnel device
|
||||
* @net: Network namespace of tunnel device
|
||||
* @sk: Socket which provides route info
|
||||
* @saddr: Memory to store the src ip address
|
||||
* @info: Tunnel information
|
||||
* @protocol: IP protocol
|
||||
* @use_cahce: Flag to enable cache usage
|
||||
* This function performs a route lookup on a tunnel
|
||||
*
|
||||
* It returns a valid dst pointer and stores src address to be used in
|
||||
* tunnel in param saddr on success, else a pointer encoded error code.
|
||||
*/
|
||||
|
||||
struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
|
||||
struct net_device *dev,
|
||||
struct net *net,
|
||||
struct socket *sock,
|
||||
struct in6_addr *saddr,
|
||||
const struct ip_tunnel_info *info,
|
||||
u8 protocol,
|
||||
bool use_cache)
|
||||
{
|
||||
struct dst_entry *dst = NULL;
|
||||
#ifdef CONFIG_DST_CACHE
|
||||
struct dst_cache *dst_cache;
|
||||
#endif
|
||||
struct flowi6 fl6;
|
||||
__u8 prio;
|
||||
|
||||
#ifdef CONFIG_DST_CACHE
|
||||
dst_cache = (struct dst_cache *)&info->dst_cache;
|
||||
if (use_cache) {
|
||||
dst = dst_cache_get_ip6(dst_cache, saddr);
|
||||
if (dst)
|
||||
return dst;
|
||||
}
|
||||
#endif
|
||||
memset(&fl6, 0, sizeof(fl6));
|
||||
fl6.flowi6_mark = skb->mark;
|
||||
fl6.flowi6_proto = protocol;
|
||||
fl6.daddr = info->key.u.ipv6.dst;
|
||||
fl6.saddr = info->key.u.ipv6.src;
|
||||
prio = info->key.tos;
|
||||
fl6.flowlabel = ip6_make_flowinfo(RT_TOS(prio),
|
||||
info->key.label);
|
||||
|
||||
dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6,
|
||||
NULL);
|
||||
if (IS_ERR(dst)) {
|
||||
netdev_dbg(dev, "no route to %pI6\n", &fl6.daddr);
|
||||
return ERR_PTR(-ENETUNREACH);
|
||||
}
|
||||
if (dst->dev == dev) { /* is this necessary? */
|
||||
netdev_dbg(dev, "circular route to %pI6\n", &fl6.daddr);
|
||||
dst_release(dst);
|
||||
return ERR_PTR(-ELOOP);
|
||||
}
|
||||
#ifdef CONFIG_DST_CACHE
|
||||
if (use_cache)
|
||||
dst_cache_set_ip6(dst_cache, dst, &fl6.saddr);
|
||||
#endif
|
||||
*saddr = fl6.saddr;
|
||||
return dst;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ip6_dst_lookup_tunnel);
|
||||
|
||||
static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
|
||||
gfp_t gfp)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in New Issue