/*
- * Copyright (c) 2011 Nicira, Inc.
- * Copyright (c) 2013 Cisco Systems, Inc.
+ * Copyright (c) 2015 Nicira, Inc.
*
* 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
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/version.h>
-
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/net.h>
#include <linux/rculist.h>
#include <linux/udp.h>
+#include <linux/if_vlan.h>
+#include <linux/module.h>
+#include <net/lisp.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/route.h>
#include "datapath.h"
#include "vport.h"
+#include "vport-netdev.h"
-/*
- * LISP encapsulation header:
- *
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * |N|L|E|V|I|flags| Nonce/Map-Version |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | Instance ID/Locator Status Bits |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *
- */
-
-/**
- * struct lisphdr - LISP header
- * @nonce_present: Flag indicating the presence of a 24 bit nonce value.
- * @locator_status_bits_present: Flag indicating the presence of Locator Status
- * Bits (LSB).
- * @solicit_echo_nonce: Flag indicating the use of the echo noncing mechanism.
- * @map_version_present: Flag indicating the use of mapping versioning.
- * @instance_id_present: Flag indicating the presence of a 24 bit Instance ID.
- * @reserved_flags: 3 bits reserved for future flags.
- * @nonce: 24 bit nonce value.
- * @map_version: 24 bit mapping version.
- * @locator_status_bits: Locator Status Bits: 32 bits when instance_id_present
- * is not set, 8 bits when it is.
- * @instance_id: 24 bit Instance ID
- */
-struct lisphdr {
-#ifdef __LITTLE_ENDIAN_BITFIELD
- __u8 reserved_flags:3;
- __u8 instance_id_present:1;
- __u8 map_version_present:1;
- __u8 solicit_echo_nonce:1;
- __u8 locator_status_bits_present:1;
- __u8 nonce_present:1;
-#else
- __u8 nonce_present:1;
- __u8 locator_status_bits_present:1;
- __u8 solicit_echo_nonce:1;
- __u8 map_version_present:1;
- __u8 instance_id_present:1;
- __u8 reserved_flags:3;
-#endif
- union {
- __u8 nonce[3];
- __u8 map_version[3];
- } u1;
- union {
- __be32 locator_status_bits;
- struct {
- __u8 instance_id[3];
- __u8 locator_status_bits;
- } word2;
- } u2;
-};
-
-#define LISP_HLEN (sizeof(struct udphdr) + sizeof(struct lisphdr))
-
+static struct vport_ops ovs_lisp_vport_ops;
/**
* struct lisp_port - Keeps track of open UDP ports
- * @dst_port: lisp UDP port no.
- * @list: list element in @lisp_ports.
- * @lisp_rcv_socket: The socket created for this port number.
- * @name: vport name.
+ * @dst_port: destination port.
*/
struct lisp_port {
- __be16 dst_port;
- struct list_head list;
- struct socket *lisp_rcv_socket;
- char name[IFNAMSIZ];
+ u16 port_no;
};
-static LIST_HEAD(lisp_ports);
-
static inline struct lisp_port *lisp_vport(const struct vport *vport)
{
return vport_priv(vport);
}
-static struct lisp_port *lisp_find_port(struct net *net, __be16 port)
-{
- struct lisp_port *lisp_port;
-
- list_for_each_entry_rcu(lisp_port, &lisp_ports, list) {
- if (lisp_port->dst_port == port &&
- net_eq(sock_net(lisp_port->lisp_rcv_socket->sk), net))
- return lisp_port;
- }
-
- return NULL;
-}
-
-static inline struct lisphdr *lisp_hdr(const struct sk_buff *skb)
-{
- return (struct lisphdr *)(udp_hdr(skb) + 1);
-}
-
-/* Convert 64 bit tunnel ID to 24 bit Instance ID. */
-static void tunnel_id_to_instance_id(__be64 tun_id, __u8 *iid)
-{
-
-#ifdef __BIG_ENDIAN
- iid[0] = (__force __u8)(tun_id >> 16);
- iid[1] = (__force __u8)(tun_id >> 8);
- iid[2] = (__force __u8)tun_id;
-#else
- iid[0] = (__force __u8)((__force u64)tun_id >> 40);
- iid[1] = (__force __u8)((__force u64)tun_id >> 48);
- iid[2] = (__force __u8)((__force u64)tun_id >> 56);
-#endif
-}
-
-/* Convert 24 bit Instance ID to 64 bit tunnel ID. */
-static __be64 instance_id_to_tunnel_id(__u8 *iid)
-{
-#ifdef __BIG_ENDIAN
- return (iid[0] << 16) | (iid[1] << 8) | iid[2];
-#else
- return (__force __be64)(((__force u64)iid[0] << 40) |
- ((__force u64)iid[1] << 48) |
- ((__force u64)iid[2] << 56));
-#endif
-}
-
-/* Compute source UDP port for outgoing packet.
- * Currently we use the flow hash.
- */
-static u16 ovs_tnl_get_src_port(struct sk_buff *skb)
-{
- int low;
- int high;
- unsigned int range;
- struct sw_flow_key *pkt_key = OVS_CB(skb)->pkt_key;
- u32 hash = jhash2((const u32 *)pkt_key,
- sizeof(*pkt_key) / sizeof(u32), 0);
-
- inet_get_local_port_range(&low, &high);
- range = (high - low) + 1;
- return (((u64) hash * range) >> 32) + low;
-}
-
-static void lisp_build_header(const struct vport *vport,
- struct sk_buff *skb,
- int tunnel_hlen)
+static int lisp_get_options(const struct vport *vport,
+ struct sk_buff *skb)
{
struct lisp_port *lisp_port = lisp_vport(vport);
- struct udphdr *udph = udp_hdr(skb);
- struct lisphdr *lisph = (struct lisphdr *)(udph + 1);
- const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
-
- udph->dest = lisp_port->dst_port;
- udph->source = htons(ovs_tnl_get_src_port(skb));
- udph->check = 0;
- udph->len = htons(skb->len - skb_transport_offset(skb));
-
- lisph->nonce_present = 0; /* We don't support echo nonce algorithm */
- lisph->locator_status_bits_present = 1; /* Set LSB */
- lisph->solicit_echo_nonce = 0; /* No echo noncing */
- lisph->map_version_present = 0; /* No mapping versioning, nonce instead */
- lisph->instance_id_present = 1; /* Store the tun_id as Instance ID */
- lisph->reserved_flags = 0; /* Reserved flags, set to 0 */
-
- lisph->u1.nonce[0] = 0;
- lisph->u1.nonce[1] = 0;
- lisph->u1.nonce[2] = 0;
-
- tunnel_id_to_instance_id(tun_key->tun_id, &lisph->u2.word2.instance_id[0]);
- lisph->u2.word2.locator_status_bits = 1;
-}
-
-/* Called with rcu_read_lock and BH disabled. */
-static int lisp_rcv(struct sock *sk, struct sk_buff *skb)
-{
- struct lisp_port *lisp_port;
- struct lisphdr *lisph;
- struct iphdr *iph, *inner_iph;
- struct ovs_key_ipv4_tunnel tun_key;
- __be64 key;
- struct ethhdr *ethh;
- __be16 protocol;
-
- lisp_port = lisp_find_port(dev_net(skb->dev), udp_hdr(skb)->dest);
- if (unlikely(!lisp_port))
- goto error;
-
- if (iptunnel_pull_header(skb, LISP_HLEN, 0))
- goto error;
-
- lisph = lisp_hdr(skb);
-
- if (lisph->instance_id_present != 1)
- key = 0;
- else
- key = instance_id_to_tunnel_id(&lisph->u2.word2.instance_id[0]);
-
- /* Save outer tunnel values */
- iph = ip_hdr(skb);
- ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);
-
- /* Drop non-IP inner packets */
- inner_iph = (struct iphdr *)(lisph + 1);
- switch (inner_iph->version) {
- case 4:
- protocol = htons(ETH_P_IP);
- break;
- case 6:
- protocol = htons(ETH_P_IPV6);
- break;
- default:
- goto error;
- }
- skb->protocol = protocol;
-
- /* Add Ethernet header */
- ethh = (struct ethhdr *)skb_push(skb, ETH_HLEN);
- memset(ethh, 0, ETH_HLEN);
- ethh->h_dest[0] = 0x02;
- ethh->h_source[0] = 0x02;
- ethh->h_proto = protocol;
-
- ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
-
- ovs_vport_receive(vport_from_priv(lisp_port), skb, &tun_key);
- goto out;
-
-error:
- kfree_skb(skb);
-out:
- return 0;
-}
-
-/* Arbitrary value. Irrelevant as long as it's not 0 since we set the handler. */
-#define UDP_ENCAP_LISP 1
-static int lisp_socket_init(struct lisp_port *lisp_port, struct net *net)
-{
- struct sockaddr_in sin;
- int err;
-
- err = sock_create_kern(AF_INET, SOCK_DGRAM, 0,
- &lisp_port->lisp_rcv_socket);
- if (err)
- goto error;
-
- /* release net ref. */
- sk_change_net(lisp_port->lisp_rcv_socket->sk, net);
-
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- sin.sin_port = lisp_port->dst_port;
-
- err = kernel_bind(lisp_port->lisp_rcv_socket, (struct sockaddr *)&sin,
- sizeof(struct sockaddr_in));
- if (err)
- goto error_sock;
-
- udp_sk(lisp_port->lisp_rcv_socket->sk)->encap_type = UDP_ENCAP_LISP;
- udp_sk(lisp_port->lisp_rcv_socket->sk)->encap_rcv = lisp_rcv;
-
- udp_encap_enable();
-
- return 0;
-error_sock:
- sk_release_kernel(lisp_port->lisp_rcv_socket->sk);
-error:
- pr_warn("cannot register lisp protocol handler: %d\n", err);
- return err;
-}
-
-static int lisp_get_options(const struct vport *vport, struct sk_buff *skb)
-{
- struct lisp_port *lisp_port = lisp_vport(vport);
-
- if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(lisp_port->dst_port)))
+ if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, lisp_port->port_no))
return -EMSGSIZE;
return 0;
}
-static void lisp_tnl_destroy(struct vport *vport)
+static int lisp_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
+ struct dp_upcall_info *upcall)
{
struct lisp_port *lisp_port = lisp_vport(vport);
+ struct net *net = ovs_dp_get_net(vport->dp);
+ __be16 dport = htons(lisp_port->port_no);
+ __be16 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
- list_del_rcu(&lisp_port->list);
- /* Release socket */
- sk_release_kernel(lisp_port->lisp_rcv_socket->sk);
-
- ovs_vport_deferred_free(vport);
+ return ovs_tunnel_get_egress_info(upcall, ovs_dp_get_net(vport->dp),
+ skb, IPPROTO_UDP, sport, dport);
}
static struct vport *lisp_tnl_create(const struct vport_parms *parms)
struct net *net = ovs_dp_get_net(parms->dp);
struct nlattr *options = parms->options;
struct lisp_port *lisp_port;
+ struct net_device *dev;
struct vport *vport;
struct nlattr *a;
- int err;
u16 dst_port;
+ int err;
if (!options) {
err = -EINVAL;
goto error;
}
- /* Verify if we already have a socket created for this port */
- if (lisp_find_port(net, htons(dst_port))) {
- err = -EEXIST;
- goto error;
- }
-
vport = ovs_vport_alloc(sizeof(struct lisp_port),
&ovs_lisp_vport_ops, parms);
if (IS_ERR(vport))
return vport;
lisp_port = lisp_vport(vport);
- lisp_port->dst_port = htons(dst_port);
- strncpy(lisp_port->name, parms->name, IFNAMSIZ);
-
- err = lisp_socket_init(lisp_port, net);
- if (err)
- goto error_free;
+ lisp_port->port_no = dst_port;
+
+ rtnl_lock();
+ dev = lisp_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
+ if (IS_ERR(dev)) {
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ return ERR_CAST(dev);
+ }
- list_add_tail_rcu(&lisp_port->list, &lisp_ports);
+ dev_change_flags(dev, dev->flags | IFF_UP);
+ rtnl_unlock();
return vport;
-
-error_free:
- ovs_vport_free(vport);
error:
return ERR_PTR(err);
}
-static bool need_linearize(const struct sk_buff *skb)
+static struct vport *lisp_create(const struct vport_parms *parms)
{
- int i;
-
- if (unlikely(skb_shinfo(skb)->frag_list))
- return true;
+ struct vport *vport;
- /*
- * Generally speaking we should linearize if there are paged frags.
- * However, if all of the refcounts are 1 we know nobody else can
- * change them from underneath us and we can skip the linearization.
- */
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
- if (unlikely(page_count(skb_frag_page(&skb_shinfo(skb)->frags[i])) > 1))
- return true;
+ vport = lisp_tnl_create(parms);
+ if (IS_ERR(vport))
+ return vport;
- return false;
+ return ovs_netdev_link(vport, parms->name);
}
-static struct sk_buff *handle_offloads(struct sk_buff *skb)
-{
- int err;
-
- if (skb_is_gso(skb)) {
- struct sk_buff *nskb;
- char cb[sizeof(skb->cb)];
-
- memcpy(cb, skb->cb, sizeof(cb));
-
- nskb = __skb_gso_segment(skb, 0, false);
- if (IS_ERR(nskb)) {
- err = PTR_ERR(nskb);
- goto error;
- }
-
- consume_skb(skb);
- skb = nskb;
- while (nskb) {
- memcpy(nskb->cb, cb, sizeof(cb));
- nskb = nskb->next;
- }
- } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
- /* Pages aren't locked and could change at any time.
- * If this happens after we compute the checksum, the
- * checksum will be wrong. We linearize now to avoid
- * this problem.
- */
- if (unlikely(need_linearize(skb))) {
- err = __skb_linearize(skb);
- if (unlikely(err))
- goto error;
- }
-
- err = skb_checksum_help(skb);
- if (unlikely(err))
- goto error;
- }
-
- skb->ip_summed = CHECKSUM_NONE;
- return skb;
-
-error:
- return ERR_PTR(err);
-}
+static struct vport_ops ovs_lisp_vport_ops = {
+ .type = OVS_VPORT_TYPE_LISP,
+ .create = lisp_create,
+ .destroy = ovs_netdev_tunnel_destroy,
+ .get_options = lisp_get_options,
+ .send = lisp_xmit,
+ .get_egress_tun_info = lisp_get_egress_tun_info,
+};
-static int ovs_tnl_send(struct vport *vport, struct sk_buff *skb,
- u8 ipproto, int tunnel_hlen,
- void (*build_header)(const struct vport *,
- struct sk_buff *,
- int tunnel_hlen))
+static int __init ovs_lisp_tnl_init(void)
{
- int min_headroom;
- struct rtable *rt;
- __be32 saddr;
- int sent_len = 0;
- int err;
- struct sk_buff *nskb;
-
- /* Route lookup */
- saddr = OVS_CB(skb)->tun_key->ipv4_src;
- rt = find_route(ovs_dp_get_net(vport->dp),
- &saddr,
- OVS_CB(skb)->tun_key->ipv4_dst,
- ipproto,
- OVS_CB(skb)->tun_key->ipv4_tos,
- skb->mark);
- if (IS_ERR(rt)) {
- err = PTR_ERR(rt);
- goto error;
- }
-
- tunnel_hlen += sizeof(struct iphdr);
-
- min_headroom = LL_RESERVED_SPACE(rt_dst(rt).dev) + rt_dst(rt).header_len
- + tunnel_hlen
- + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
-
- if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
- int head_delta = SKB_DATA_ALIGN(min_headroom -
- skb_headroom(skb) +
- 16);
-
- err = pskb_expand_head(skb, max_t(int, head_delta, 0),
- 0, GFP_ATOMIC);
- if (unlikely(err))
- goto err_free_rt;
- }
-
- /* Offloading */
- nskb = handle_offloads(skb);
- if (IS_ERR(nskb)) {
- err = PTR_ERR(nskb);
- goto err_free_rt;
- }
- skb = nskb;
-
- /* Reset SKB */
- nf_reset(skb);
- secpath_reset(skb);
- skb_dst_drop(skb);
- skb_clear_rxhash(skb);
-
- while (skb) {
- struct sk_buff *next_skb = skb->next;
- struct iphdr *iph;
- int frag_len;
-
- skb->next = NULL;
-
- if (vlan_tx_tag_present(skb)) {
- if (unlikely(!__vlan_put_tag(skb,
- skb->vlan_proto,
- vlan_tx_tag_get(skb))))
- goto next;
-
- vlan_set_tci(skb, 0);
- }
-
- frag_len = skb->len;
- skb_push(skb, tunnel_hlen);
- skb_reset_network_header(skb);
- skb_set_transport_header(skb, sizeof(struct iphdr));
-
- if (next_skb)
- skb_dst_set(skb, dst_clone(&rt_dst(rt)));
- else
- skb_dst_set(skb, &rt_dst(rt));
-
- /* Push Tunnel header. */
- build_header(vport, skb, tunnel_hlen);
-
- /* Push IP header. */
- iph = ip_hdr(skb);
- iph->version = 4;
- iph->ihl = sizeof(struct iphdr) >> 2;
- iph->protocol = ipproto;
- iph->daddr = OVS_CB(skb)->tun_key->ipv4_dst;
- iph->saddr = saddr;
- iph->tos = OVS_CB(skb)->tun_key->ipv4_tos;
- iph->ttl = OVS_CB(skb)->tun_key->ipv4_ttl;
- iph->frag_off = OVS_CB(skb)->tun_key->tun_flags &
- TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
- /*
- * Allow our local IP stack to fragment the outer packet even
- * if the DF bit is set as a last resort. We also need to
- * force selection of an IP ID here with __ip_select_ident(),
- * as ip_select_ident() assumes a proper ID is not needed when
- * when the DF bit is set.
- */
- skb->local_df = 1;
- __ip_select_ident(iph, skb_dst(skb), 0);
-
- memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
-
- err = ip_local_out(skb);
- if (unlikely(net_xmit_eval(err)))
- goto next;
-
- sent_len += frag_len;
-
-next:
- skb = next_skb;
- }
-
- return sent_len;
-
-err_free_rt:
- ip_rt_put(rt);
-error:
- return err;
+ return ovs_vport_ops_register(&ovs_lisp_vport_ops);
}
-static int lisp_tnl_send(struct vport *vport, struct sk_buff *skb)
+static void __exit ovs_lisp_tnl_exit(void)
{
- int tnl_len;
- int network_offset = skb_network_offset(skb);
-
- if (unlikely(!OVS_CB(skb)->tun_key))
- return -EINVAL;
-
- /* We only encapsulate IPv4 and IPv6 packets */
- switch (skb->protocol) {
- case htons(ETH_P_IP):
- case htons(ETH_P_IPV6):
- /* Pop off "inner" Ethernet header */
- skb_pull(skb, network_offset);
- tnl_len = ovs_tnl_send(vport, skb, IPPROTO_UDP,
- LISP_HLEN, lisp_build_header);
- return tnl_len > 0 ? tnl_len + network_offset : tnl_len;
- default:
- kfree_skb(skb);
- return 0;
- }
+ ovs_vport_ops_unregister(&ovs_lisp_vport_ops);
}
-static const char *lisp_get_name(const struct vport *vport)
-{
- struct lisp_port *lisp_port = lisp_vport(vport);
- return lisp_port->name;
-}
+module_init(ovs_lisp_tnl_init);
+module_exit(ovs_lisp_tnl_exit);
-const struct vport_ops ovs_lisp_vport_ops = {
- .type = OVS_VPORT_TYPE_LISP,
- .create = lisp_tnl_create,
- .destroy = lisp_tnl_destroy,
- .get_name = lisp_get_name,
- .get_options = lisp_get_options,
- .send = lisp_tnl_send,
-};
+MODULE_DESCRIPTION("OVS: Lisp switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-105");
projects / cascardo / ovs.git / blobdiff