/*
- * Copyright (c) 2010 Nicira Networks.
- * Distributed under the terms of the GNU GPL version 2.
+ * Copyright (c) 2007-2015 Nicira, Inc.
*
- * Significant portions of this file may be copied from parts of the Linux
- * kernel, by Linus Torvalds and others.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/if_tunnel.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
+#include <linux/in_route.h>
+#include <linux/inetdevice.h>
+#include <linux/jhash.h>
+#include <linux/list.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include <linux/rculist.h>
+#include <net/route.h>
+#include <net/xfrm.h>
#include <net/icmp.h>
#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/gre.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
#include <net/protocol.h>
-#include "tunnel.h"
+#include "datapath.h"
#include "vport.h"
-#include "vport-generic.h"
-
-/*
- * The GRE header is composed of a series of sections: a base and then a variable
- * number of options.
- */
-#define GRE_HEADER_SECTION 4
-
-struct gre_base_hdr {
- __be16 flags;
- __be16 protocol;
-};
-
-static int gre_hdr_len(const struct tnl_port_config *port_config)
-{
- int len;
-
- len = GRE_HEADER_SECTION;
-
- if (port_config->flags & TNL_F_CSUM)
- len += GRE_HEADER_SECTION;
-
- if (port_config->out_key ||
- port_config->flags & TNL_F_OUT_KEY_ACTION)
- len += GRE_HEADER_SECTION;
-
- return len;
-}
-
-static void gre_build_header(const struct vport *vport,
- const struct tnl_mutable_config *mutable,
- void *header)
-{
- struct gre_base_hdr *greh = header;
- __be32 *options = (__be32 *)(greh + 1);
-
- greh->protocol = htons(ETH_P_TEB);
- greh->flags = 0;
-
- if (mutable->port_config.flags & TNL_F_CSUM) {
- greh->flags |= GRE_CSUM;
- *options = 0;
- options++;
- }
-
- if (mutable->port_config.out_key ||
- mutable->port_config.flags & TNL_F_OUT_KEY_ACTION)
- greh->flags |= GRE_KEY;
-
- if (mutable->port_config.out_key)
- *options = mutable->port_config.out_key;
-}
-
-static struct sk_buff *gre_update_header(const struct vport *vport,
- const struct tnl_mutable_config *mutable,
- struct dst_entry *dst,
- struct sk_buff *skb)
-{
- __be32 *options = (__be32 *)(skb_network_header(skb) + mutable->tunnel_hlen
- - GRE_HEADER_SECTION);
+#include "vport-netdev.h"
- /* Work backwards over the options so the checksum is last. */
- if (mutable->port_config.flags & TNL_F_OUT_KEY_ACTION) {
- *options = OVS_CB(skb)->tun_id;
- options--;
- }
-
- if (mutable->port_config.flags & TNL_F_CSUM)
- *(__sum16 *)options = csum_fold(skb_checksum(skb,
- skb_transport_offset(skb),
- skb->len - skb_transport_offset(skb),
- 0));
- /*
- * Allow our local IP stack to fragment the outer packet even if the
- * DF bit is set as a last resort.
- */
- skb->local_df = 1;
+static struct vport_ops ovs_gre_vport_ops;
- return skb;
-}
-
-static int parse_header(struct iphdr *iph, __be16 *flags, __be32 *key)
-{
- /* IP and ICMP protocol handlers check that the IHL is valid. */
- struct gre_base_hdr *greh = (struct gre_base_hdr *)((u8 *)iph + (iph->ihl << 2));
- __be32 *options = (__be32 *)(greh + 1);
- int hdr_len;
-
- *flags = greh->flags;
-
- if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
- return -EINVAL;
-
- if (unlikely(greh->protocol != htons(ETH_P_TEB)))
- return -EINVAL;
-
- hdr_len = GRE_HEADER_SECTION;
-
- if (greh->flags & GRE_CSUM) {
- hdr_len += GRE_HEADER_SECTION;
- options++;
- }
-
- if (greh->flags & GRE_KEY) {
- hdr_len += GRE_HEADER_SECTION;
-
- *key = *options;
- options++;
- } else
- *key = 0;
-
- if (unlikely(greh->flags & GRE_SEQ))
- hdr_len += GRE_HEADER_SECTION;
-
- return hdr_len;
-}
-
-/* Called with rcu_read_lock and BH disabled. */
-static void gre_err(struct sk_buff *skb, u32 info)
+static struct vport *gre_tnl_create(const struct vport_parms *parms)
{
+ struct net *net = ovs_dp_get_net(parms->dp);
+ struct net_device *dev;
struct vport *vport;
- const struct tnl_mutable_config *mutable;
- const int type = icmp_hdr(skb)->type;
- const int code = icmp_hdr(skb)->code;
- int mtu = ntohs(icmp_hdr(skb)->un.frag.mtu);
-
- struct iphdr *iph;
- __be16 flags;
- __be32 key;
- int tunnel_hdr_len, tot_hdr_len;
- unsigned int orig_mac_header;
- unsigned int orig_nw_header;
- if (type != ICMP_DEST_UNREACH || code != ICMP_FRAG_NEEDED)
- return;
+ vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
+ if (IS_ERR(vport))
+ return vport;
- /*
- * The mimimum size packet that we would actually be able to process:
- * encapsulating IP header, minimum GRE header, Ethernet header,
- * inner IPv4 header.
- */
- if (!pskb_may_pull(skb, sizeof(struct iphdr) + GRE_HEADER_SECTION +
- ETH_HLEN + sizeof(struct iphdr)))
- return;
-
- iph = (struct iphdr *)skb->data;
-
- tunnel_hdr_len = parse_header(iph, &flags, &key);
- if (tunnel_hdr_len < 0)
- return;
-
- vport = tnl_find_port(iph->saddr, iph->daddr, key,
- TNL_T_PROTO_GRE | TNL_T_KEY_EITHER, &mutable);
- if (!vport)
- return;
-
- /*
- * Packets received by this function were previously sent by us, so
- * any comparisons should be to the output values, not the input.
- * However, it's not really worth it to have a hash table based on
- * output keys (especially since ICMP error handling of tunneled packets
- * isn't that reliable anyways). Therefore, we do a lookup based on the
- * out key as if it were the in key and then check to see if the input
- * and output keys are the same.
- */
- if (mutable->port_config.in_key != mutable->port_config.out_key)
- return;
-
- if (!!(mutable->port_config.flags & TNL_F_IN_KEY_MATCH) !=
- !!(mutable->port_config.flags & TNL_F_OUT_KEY_ACTION))
- return;
-
- if ((mutable->port_config.flags & TNL_F_CSUM) && !(flags & GRE_CSUM))
- return;
-
- tunnel_hdr_len += iph->ihl << 2;
-
- orig_mac_header = skb_mac_header(skb) - skb->data;
- orig_nw_header = skb_network_header(skb) - skb->data;
- skb_set_mac_header(skb, tunnel_hdr_len);
-
- tot_hdr_len = tunnel_hdr_len + ETH_HLEN;
-
- skb->protocol = eth_hdr(skb)->h_proto;
- if (skb->protocol == htons(ETH_P_8021Q)) {
- tot_hdr_len += VLAN_HLEN;
- skb->protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
+ rtnl_lock();
+ dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
+ if (IS_ERR(dev)) {
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ return ERR_CAST(dev);
}
- skb_set_network_header(skb, tot_hdr_len);
- mtu -= tot_hdr_len;
-
- if (skb->protocol == htons(ETH_P_IP))
- tot_hdr_len += sizeof(struct iphdr);
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
- else if (skb->protocol == htons(ETH_P_IPV6))
- tot_hdr_len += sizeof(struct ipv6hdr);
-#endif
- else
- goto out;
-
- if (!pskb_may_pull(skb, tot_hdr_len))
- goto out;
-
- if (skb->protocol == htons(ETH_P_IP)) {
- if (mtu < IP_MIN_MTU) {
- if (ntohs(ip_hdr(skb)->tot_len) >= IP_MIN_MTU)
- mtu = IP_MIN_MTU;
- else
- goto out;
- }
-
- }
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
- else if (skb->protocol == htons(ETH_P_IPV6)) {
- if (mtu < IPV6_MIN_MTU) {
- unsigned int packet_length = sizeof(struct ipv6hdr) +
- ntohs(ipv6_hdr(skb)->payload_len);
-
- if (packet_length >= IPV6_MIN_MTU
- || ntohs(ipv6_hdr(skb)->payload_len) == 0)
- mtu = IPV6_MIN_MTU;
- else
- goto out;
- }
- }
-#endif
-
- __skb_pull(skb, tunnel_hdr_len);
- tnl_frag_needed(vport, mutable, skb, mtu, key);
- __skb_push(skb, tunnel_hdr_len);
-
-out:
- skb_set_mac_header(skb, orig_mac_header);
- skb_set_network_header(skb, orig_nw_header);
- skb->protocol = htons(ETH_P_IP);
-}
-
-static bool check_checksum(struct sk_buff *skb)
-{
- struct iphdr *iph = ip_hdr(skb);
- struct gre_base_hdr *greh = (struct gre_base_hdr *)(iph + 1);
- __sum16 csum = 0;
-
- if (greh->flags & GRE_CSUM) {
- switch (skb->ip_summed) {
- case CHECKSUM_COMPLETE:
- csum = csum_fold(skb->csum);
-
- if (!csum)
- break;
- /* Fall through. */
+ dev_change_flags(dev, dev->flags | IFF_UP);
+ rtnl_unlock();
- case CHECKSUM_NONE:
- skb->csum = 0;
- csum = __skb_checksum_complete(skb);
- skb->ip_summed = CHECKSUM_COMPLETE;
- break;
- }
- }
-
- return (csum == 0);
+ return vport;
}
-/* Called with rcu_read_lock and BH disabled. */
-static int gre_rcv(struct sk_buff *skb)
+static struct vport *gre_create(const struct vport_parms *parms)
{
struct vport *vport;
- const struct tnl_mutable_config *mutable;
- int hdr_len;
- struct iphdr *iph;
- __be16 flags;
- __be32 key;
-
- if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr) + ETH_HLEN)))
- goto error;
-
- if (unlikely(!check_checksum(skb)))
- goto error;
-
- hdr_len = parse_header(ip_hdr(skb), &flags, &key);
- if (unlikely(hdr_len < 0))
- goto error;
-
- if (unlikely(!pskb_may_pull(skb, hdr_len + ETH_HLEN)))
- goto error;
-
- iph = ip_hdr(skb);
- vport = tnl_find_port(iph->daddr, iph->saddr, key,
- TNL_T_PROTO_GRE | TNL_T_KEY_EITHER, &mutable);
- if (unlikely(!vport)) {
- icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
- goto error;
- }
- if (mutable->port_config.flags & TNL_F_IN_KEY_MATCH)
- OVS_CB(skb)->tun_id = key;
- else
- OVS_CB(skb)->tun_id = 0;
+ vport = gre_tnl_create(parms);
+ if (IS_ERR(vport))
+ return vport;
- __skb_pull(skb, hdr_len);
- skb_postpull_rcsum(skb, skb_transport_header(skb), hdr_len + ETH_HLEN);
-
- tnl_rcv(vport, skb);
- return 0;
-
-error:
- kfree_skb(skb);
- return 0;
+ return ovs_netdev_link(vport, parms->name);
}
-static const struct tnl_ops gre_tnl_ops = {
- .tunnel_type = TNL_T_PROTO_GRE,
- .ipproto = IPPROTO_GRE,
- .hdr_len = gre_hdr_len,
- .build_header = gre_build_header,
- .update_header = gre_update_header,
-};
-
-static struct vport *gre_create(const char *name, const void __user *config)
+static int gre_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
+ struct dp_upcall_info *upcall)
{
- return tnl_create(name, config, &gre_vport_ops, &gre_tnl_ops);
+ return ovs_tunnel_get_egress_info(upcall, ovs_dp_get_net(vport->dp),
+ skb, IPPROTO_GRE, 0, 0);
}
-static const struct net_protocol gre_protocol_handlers = {
- .handler = gre_rcv,
- .err_handler = gre_err,
+static struct vport_ops ovs_gre_vport_ops = {
+ .type = OVS_VPORT_TYPE_GRE,
+ .create = gre_create,
+ .send = gre_fb_xmit,
+ .get_egress_tun_info = gre_get_egress_tun_info,
+ .destroy = ovs_netdev_tunnel_destroy,
};
-static int gre_init(void)
+static int __init ovs_gre_tnl_init(void)
{
- int err;
-
- err = inet_add_protocol(&gre_protocol_handlers, IPPROTO_GRE);
- if (err)
- pr_warn("cannot register gre protocol handler\n");
-
- return err;
+ return ovs_vport_ops_register(&ovs_gre_vport_ops);
}
-static void gre_exit(void)
+static void __exit ovs_gre_tnl_exit(void)
{
- inet_del_protocol(&gre_protocol_handlers, IPPROTO_GRE);
+ ovs_vport_ops_unregister(&ovs_gre_vport_ops);
}
-const struct vport_ops gre_vport_ops = {
- .type = "gre",
- .flags = VPORT_F_GEN_STATS | VPORT_F_TUN_ID,
- .init = gre_init,
- .exit = gre_exit,
- .create = gre_create,
- .modify = tnl_modify,
- .destroy = tnl_destroy,
- .set_mtu = tnl_set_mtu,
- .set_addr = tnl_set_addr,
- .get_name = tnl_get_name,
- .get_addr = tnl_get_addr,
- .get_dev_flags = vport_gen_get_dev_flags,
- .is_running = vport_gen_is_running,
- .get_operstate = vport_gen_get_operstate,
- .get_mtu = tnl_get_mtu,
- .send = tnl_send,
-};
+module_init(ovs_gre_tnl_init);
+module_exit(ovs_gre_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: GRE switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-3");
projects / cascardo / ovs.git / blobdiff