geneve: Consolidate Geneve functionality in single module.

geneve_core module handles send and receive functionality.
This way OVS could use the Geneve API. Now with use of
tunnel meatadata mode OVS can directly use Geneve netdevice.
So there is no need for separate module for Geneve. Following
patch consolidates Geneve protocol processing in single module.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Reviewed-by: Jesse Gross <jesse@nicira.com>
Acked-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 0 insertions, 462 deletions

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 6fb3c90ad726..416dfa004cfb 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -331,20 +331,6 @@ config NET_FOU_IP_TUNNELS
 	  When this option is enabled IP tunnels can be configured to use
 	  FOU or GUE encapsulation.
 
-config GENEVE_CORE
-	tristate "Generic Network Virtualization Encapsulation library"
-	depends on INET
-	select NET_UDP_TUNNEL
-	---help---
-	This allows one to create Geneve virtual interfaces that provide
-	Layer 2 Networks over Layer 3 Networks. Geneve is often used
-	to tunnel virtual network infrastructure in virtualized environments.
-	For more information see:
-	  http://tools.ietf.org/html/draft-gross-geneve-01
-
-	  To compile this driver as a module, choose M here: the module
-
-
 config INET_AH
 	tristate "IP: AH transformation"
 	select XFRM_ALGO
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index efc43f300b8c..89aacb630a53 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -57,7 +57,6 @@ obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
 obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
 obj-$(CONFIG_MEMCG_KMEM) += tcp_memcontrol.o
 obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
-obj-$(CONFIG_GENEVE_CORE) += geneve_core.o
 
 obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
 		      xfrm4_output.o xfrm4_protocol.o
diff --git a/net/ipv4/geneve_core.c b/net/ipv4/geneve_core.c
deleted file mode 100644
index 311a4ba6950a..000000000000
--- a/net/ipv4/geneve_core.c
+++ /dev/null
@@ -1,447 +0,0 @@
-/*
- * Geneve: Generic Network Virtualization Encapsulation
- *
- * Copyright (c) 2014 Nicira, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * 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/kernel.h>
-#include <linux/types.h>
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/list.h>
-#include <linux/netdevice.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <linux/igmp.h>
-#include <linux/etherdevice.h>
-#include <linux/if_ether.h>
-#include <linux/if_vlan.h>
-#include <linux/ethtool.h>
-#include <linux/mutex.h>
-#include <net/arp.h>
-#include <net/ndisc.h>
-#include <net/ip.h>
-#include <net/ip_tunnels.h>
-#include <net/icmp.h>
-#include <net/udp.h>
-#include <net/rtnetlink.h>
-#include <net/route.h>
-#include <net/dsfield.h>
-#include <net/inet_ecn.h>
-#include <net/net_namespace.h>
-#include <net/netns/generic.h>
-#include <net/geneve.h>
-#include <net/protocol.h>
-#include <net/udp_tunnel.h>
-#if IS_ENABLED(CONFIG_IPV6)
-#include <net/ipv6.h>
-#include <net/addrconf.h>
-#include <net/ip6_tunnel.h>
-#include <net/ip6_checksum.h>
-#endif
-
-/* Protects sock_list and refcounts. */
-static DEFINE_MUTEX(geneve_mutex);
-
-/* per-network namespace private data for this module */
-struct geneve_net {
-	struct list_head	sock_list;
-};
-
-static int geneve_net_id;
-
-static struct geneve_sock *geneve_find_sock(struct net *net,
-					    sa_family_t family, __be16 port)
-{
-	struct geneve_net *gn = net_generic(net, geneve_net_id);
-	struct geneve_sock *gs;
-
-	list_for_each_entry(gs, &gn->sock_list, list) {
-		if (inet_sk(gs->sock->sk)->inet_sport == port &&
-		    inet_sk(gs->sock->sk)->sk.sk_family == family)
-			return gs;
-	}
-
-	return NULL;
-}
-
-static void geneve_build_header(struct genevehdr *geneveh,
-				__be16 tun_flags, u8 vni[3],
-				u8 options_len, u8 *options)
-{
-	geneveh->ver = GENEVE_VER;
-	geneveh->opt_len = options_len / 4;
-	geneveh->oam = !!(tun_flags & TUNNEL_OAM);
-	geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
-	geneveh->rsvd1 = 0;
-	memcpy(geneveh->vni, vni, 3);
-	geneveh->proto_type = htons(ETH_P_TEB);
-	geneveh->rsvd2 = 0;
-
-	memcpy(geneveh->options, options, options_len);
-}
-
-/* Transmit a fully formatted Geneve frame.
- *
- * When calling this function. The skb->data should point
- * to the geneve header which is fully formed.
- *
- * This function will add other UDP tunnel headers.
- */
-int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
-		    struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos,
-		    __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
-		    __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
-		    bool csum, bool xnet)
-{
-	struct genevehdr *gnvh;
-	int min_headroom;
-	int err;
-
-	min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
-			+ GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr)
-			+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
-
-	err = skb_cow_head(skb, min_headroom);
-	if (unlikely(err)) {
-		kfree_skb(skb);
-		return err;
-	}
-
-	skb = vlan_hwaccel_push_inside(skb);
-	if (unlikely(!skb))
-		return -ENOMEM;
-
-	skb = udp_tunnel_handle_offloads(skb, csum);
-	if (IS_ERR(skb))
-		return PTR_ERR(skb);
-
-	gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
-	geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
-
-	skb_set_inner_protocol(skb, htons(ETH_P_TEB));
-
-	return udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, src, dst,
-				   tos, ttl, df, src_port, dst_port, xnet,
-				   !csum);
-}
-EXPORT_SYMBOL_GPL(geneve_xmit_skb);
-
-static int geneve_hlen(struct genevehdr *gh)
-{
-	return sizeof(*gh) + gh->opt_len * 4;
-}
-
-static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
-					   struct sk_buff *skb,
-					   struct udp_offload *uoff)
-{
-	struct sk_buff *p, **pp = NULL;
-	struct genevehdr *gh, *gh2;
-	unsigned int hlen, gh_len, off_gnv;
-	const struct packet_offload *ptype;
-	__be16 type;
-	int flush = 1;
-
-	off_gnv = skb_gro_offset(skb);
-	hlen = off_gnv + sizeof(*gh);
-	gh = skb_gro_header_fast(skb, off_gnv);
-	if (skb_gro_header_hard(skb, hlen)) {
-		gh = skb_gro_header_slow(skb, hlen, off_gnv);
-		if (unlikely(!gh))
-			goto out;
-	}
-
-	if (gh->ver != GENEVE_VER || gh->oam)
-		goto out;
-	gh_len = geneve_hlen(gh);
-
-	hlen = off_gnv + gh_len;
-	if (skb_gro_header_hard(skb, hlen)) {
-		gh = skb_gro_header_slow(skb, hlen, off_gnv);
-		if (unlikely(!gh))
-			goto out;
-	}
-
-	flush = 0;
-
-	for (p = *head; p; p = p->next) {
-		if (!NAPI_GRO_CB(p)->same_flow)
-			continue;
-
-		gh2 = (struct genevehdr *)(p->data + off_gnv);
-		if (gh->opt_len != gh2->opt_len ||
-		    memcmp(gh, gh2, gh_len)) {
-			NAPI_GRO_CB(p)->same_flow = 0;
-			continue;
-		}
-	}
-
-	type = gh->proto_type;
-
-	rcu_read_lock();
-	ptype = gro_find_receive_by_type(type);
-	if (!ptype) {
-		flush = 1;
-		goto out_unlock;
-	}
-
-	skb_gro_pull(skb, gh_len);
-	skb_gro_postpull_rcsum(skb, gh, gh_len);
-	pp = ptype->callbacks.gro_receive(head, skb);
-
-out_unlock:
-	rcu_read_unlock();
-out:
-	NAPI_GRO_CB(skb)->flush |= flush;
-
-	return pp;
-}
-
-static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
-			       struct udp_offload *uoff)
-{
-	struct genevehdr *gh;
-	struct packet_offload *ptype;
-	__be16 type;
-	int gh_len;
-	int err = -ENOSYS;
-
-	udp_tunnel_gro_complete(skb, nhoff);
-
-	gh = (struct genevehdr *)(skb->data + nhoff);
-	gh_len = geneve_hlen(gh);
-	type = gh->proto_type;
-
-	rcu_read_lock();
-	ptype = gro_find_complete_by_type(type);
-	if (ptype)
-		err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
-
-	rcu_read_unlock();
-	return err;
-}
-
-static void geneve_notify_add_rx_port(struct geneve_sock *gs)
-{
-	struct sock *sk = gs->sock->sk;
-	sa_family_t sa_family = sk->sk_family;
-	int err;
-
-	if (sa_family == AF_INET) {
-		err = udp_add_offload(&gs->udp_offloads);
-		if (err)
-			pr_warn("geneve: udp_add_offload failed with status %d\n",
-				err);
-	}
-}
-
-static void geneve_notify_del_rx_port(struct geneve_sock *gs)
-{
-	struct sock *sk = gs->sock->sk;
-	sa_family_t sa_family = sk->sk_family;
-
-	if (sa_family == AF_INET)
-		udp_del_offload(&gs->udp_offloads);
-}
-
-/* Callback from net/ipv4/udp.c to receive packets */
-static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
-{
-	struct genevehdr *geneveh;
-	struct geneve_sock *gs;
-	int opts_len;
-
-	/* Need Geneve and inner Ethernet header to be present */
-	if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
-		goto error;
-
-	/* Return packets with reserved bits set */
-	geneveh = geneve_hdr(skb);
-
-	if (unlikely(geneveh->ver != GENEVE_VER))
-		goto error;
-
-	if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
-		goto error;
-
-	opts_len = geneveh->opt_len * 4;
-	if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
-				 htons(ETH_P_TEB)))
-		goto drop;
-
-	gs = rcu_dereference_sk_user_data(sk);
-	if (!gs)
-		goto drop;
-
-	gs->rcv(gs, skb);
-	return 0;
-
-drop:
-	/* Consume bad packet */
-	kfree_skb(skb);
-	return 0;
-
-error:
-	/* Let the UDP layer deal with the skb */
-	return 1;
-}
-
-static struct socket *geneve_create_sock(struct net *net, bool ipv6,
-					 __be16 port)
-{
-	struct socket *sock;
-	struct udp_port_cfg udp_conf;
-	int err;
-
-	memset(&udp_conf, 0, sizeof(udp_conf));
-
-	if (ipv6) {
-		udp_conf.family = AF_INET6;
-	} else {
-		udp_conf.family = AF_INET;
-		udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
-	}
-
-	udp_conf.local_udp_port = port;
-
-	/* Open UDP socket */
-	err = udp_sock_create(net, &udp_conf, &sock);
-	if (err < 0)
-		return ERR_PTR(err);
-
-	return sock;
-}
-
-/* Create new listen socket if needed */
-static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
-						geneve_rcv_t *rcv, void *data,
-						bool ipv6)
-{
-	struct geneve_net *gn = net_generic(net, geneve_net_id);
-	struct geneve_sock *gs;
-	struct socket *sock;
-	struct udp_tunnel_sock_cfg tunnel_cfg;
-
-	gs = kzalloc(sizeof(*gs), GFP_KERNEL);
-	if (!gs)
-		return ERR_PTR(-ENOMEM);
-
-	sock = geneve_create_sock(net, ipv6, port);
-	if (IS_ERR(sock)) {
-		kfree(gs);
-		return ERR_CAST(sock);
-	}
-
-	gs->sock = sock;
-	gs->refcnt = 1;
-	gs->rcv = rcv;
-	gs->rcv_data = data;
-
-	/* Initialize the geneve udp offloads structure */
-	gs->udp_offloads.port = port;
-	gs->udp_offloads.callbacks.gro_receive  = geneve_gro_receive;
-	gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
-	geneve_notify_add_rx_port(gs);
-
-	/* Mark socket as an encapsulation socket */
-	tunnel_cfg.sk_user_data = gs;
-	tunnel_cfg.encap_type = 1;
-	tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
-	tunnel_cfg.encap_destroy = NULL;
-	setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
-
-	list_add(&gs->list, &gn->sock_list);
-
-	return gs;
-}
-
-struct geneve_sock *geneve_sock_add(struct net *net, __be16 port,
-				    geneve_rcv_t *rcv, void *data,
-				    bool no_share, bool ipv6)
-{
-	struct geneve_sock *gs;
-
-	mutex_lock(&geneve_mutex);
-
-	gs = geneve_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port);
-	if (gs) {
-		if (!no_share && gs->rcv == rcv)
-			gs->refcnt++;
-		else
-			gs = ERR_PTR(-EBUSY);
-	} else {
-		gs = geneve_socket_create(net, port, rcv, data, ipv6);
-	}
-
-	mutex_unlock(&geneve_mutex);
-
-	return gs;
-}
-EXPORT_SYMBOL_GPL(geneve_sock_add);
-
-void geneve_sock_release(struct geneve_sock *gs)
-{
-	mutex_lock(&geneve_mutex);
-
-	if (--gs->refcnt)
-		goto unlock;
-
-	list_del(&gs->list);
-	geneve_notify_del_rx_port(gs);
-	udp_tunnel_sock_release(gs->sock);
-	kfree_rcu(gs, rcu);
-
-unlock:
-	mutex_unlock(&geneve_mutex);
-}
-EXPORT_SYMBOL_GPL(geneve_sock_release);
-
-static __net_init int geneve_init_net(struct net *net)
-{
-	struct geneve_net *gn = net_generic(net, geneve_net_id);
-
-	INIT_LIST_HEAD(&gn->sock_list);
-
-	return 0;
-}
-
-static struct pernet_operations geneve_net_ops = {
-	.init = geneve_init_net,
-	.id   = &geneve_net_id,
-	.size = sizeof(struct geneve_net),
-};
-
-static int __init geneve_init_module(void)
-{
-	int rc;
-
-	rc = register_pernet_subsys(&geneve_net_ops);
-	if (rc)
-		return rc;
-
-	pr_info("Geneve core logic\n");
-
-	return 0;
-}
-module_init(geneve_init_module);
-
-static void __exit geneve_cleanup_module(void)
-{
-	unregister_pernet_subsys(&geneve_net_ops);
-}
-module_exit(geneve_cleanup_module);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Jesse Gross <jesse@nicira.com>");
-MODULE_DESCRIPTION("Driver library for GENEVE encapsulated traffic");