[linux-block.git] / net / ipv4 / ip_tunnel_core.c

/*
 * Copyright (c) 2013 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
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/mroute.h>
#include <linux/init.h>
#include <linux/in6.h>
#include <linux/inetdevice.h>
#include <linux/netfilter_ipv4.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>

#include <net/ip.h>
#include <net/icmp.h>
#include <net/protocol.h>
#include <net/ip_tunnels.h>
#include <net/arp.h>
#include <net/checksum.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>

int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
		  __be32 src, __be32 dst, __u8 proto,
		  __u8 tos, __u8 ttl, __be16 df, bool xnet)
{
	int pkt_len = skb->len;
	struct iphdr *iph;
	int err;

	skb_scrub_packet(skb, xnet);

	skb_clear_hash(skb);
	skb_dst_set(skb, &rt->dst);
	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));

	/* Push down and install the IP header. */
	skb_push(skb, sizeof(struct iphdr));
	skb_reset_network_header(skb);

	iph = ip_hdr(skb);

	iph->version	=	4;
	iph->ihl	=	sizeof(struct iphdr) >> 2;
	iph->frag_off	=	df;
	iph->protocol	=	proto;
	iph->tos	=	tos;
	iph->daddr	=	dst;
	iph->saddr	=	src;
	iph->ttl	=	ttl;
	__ip_select_ident(dev_net(rt->dst.dev), iph,
			  skb_shinfo(skb)->gso_segs ?: 1);

	err = ip_local_out_sk(sk, skb);
	if (unlikely(net_xmit_eval(err)))
		pkt_len = 0;
	return pkt_len;
}
EXPORT_SYMBOL_GPL(iptunnel_xmit);

int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
{
	if (unlikely(!pskb_may_pull(skb, hdr_len)))
		return -ENOMEM;

	skb_pull_rcsum(skb, hdr_len);

	if (inner_proto == htons(ETH_P_TEB)) {
		struct ethhdr *eh;

		if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
			return -ENOMEM;

		eh = (struct ethhdr *)skb->data;
		if (likely(eth_proto_is_802_3(eh->h_proto)))
			skb->protocol = eh->h_proto;
		else
			skb->protocol = htons(ETH_P_802_2);

	} else {
		skb->protocol = inner_proto;
	}

	nf_reset(skb);
	secpath_reset(skb);
	skb_clear_hash_if_not_l4(skb);
	skb_dst_drop(skb);
	skb->vlan_tci = 0;
	skb_set_queue_mapping(skb, 0);
	skb->pkt_type = PACKET_HOST;
	return 0;
}
EXPORT_SYMBOL_GPL(iptunnel_pull_header);

struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb,
					 bool csum_help,
					 int gso_type_mask)
{
	int err;

	if (likely(!skb->encapsulation)) {
		skb_reset_inner_headers(skb);
		skb->encapsulation = 1;
	}

	if (skb_is_gso(skb)) {
		err = skb_unclone(skb, GFP_ATOMIC);
		if (unlikely(err))
			goto error;
		skb_shinfo(skb)->gso_type |= gso_type_mask;
		return skb;
	}

	/* If packet is not gso and we are resolving any partial checksum,
	 * clear encapsulation flag. This allows setting CHECKSUM_PARTIAL
	 * on the outer header without confusing devices that implement
	 * NETIF_F_IP_CSUM with encapsulation.
	 */
	if (csum_help)
		skb->encapsulation = 0;

	if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) {
		err = skb_checksum_help(skb);
		if (unlikely(err))
			goto error;
	} else if (skb->ip_summed != CHECKSUM_PARTIAL)
		skb->ip_summed = CHECKSUM_NONE;

	return skb;
error:
	kfree_skb(skb);
	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);

/* Often modified stats are per cpu, other are shared (netdev->stats) */
struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
						struct rtnl_link_stats64 *tot)
{
	int i;

	netdev_stats_to_stats64(tot, &dev->stats);

	for_each_possible_cpu(i) {
		const struct pcpu_sw_netstats *tstats =
						   per_cpu_ptr(dev->tstats, i);
		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
		unsigned int start;

		do {
			start = u64_stats_fetch_begin_irq(&tstats->syncp);
			rx_packets = tstats->rx_packets;
			tx_packets = tstats->tx_packets;
			rx_bytes = tstats->rx_bytes;
			tx_bytes = tstats->tx_bytes;
		} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));

		tot->rx_packets += rx_packets;
		tot->tx_packets += tx_packets;
		tot->rx_bytes   += rx_bytes;
		tot->tx_bytes   += tx_bytes;
	}

	return tot;
}
EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
Commit	Line	Data
0e6fbc5b PS	1	/*
	2	* Copyright (c) 2013 Nicira, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of version 2 of the GNU General Public
	6	* License as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	16	* 02110-1301, USA
	17	*/
	18
	19	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	20
	21	#include <linux/types.h>
	22	#include <linux/kernel.h>
	23	#include <linux/skbuff.h>
	24	#include <linux/netdevice.h>
	25	#include <linux/in.h>
	26	#include <linux/if_arp.h>
	27	#include <linux/mroute.h>
	28	#include <linux/init.h>
	29	#include <linux/in6.h>
	30	#include <linux/inetdevice.h>
	31	#include <linux/netfilter_ipv4.h>
	32	#include <linux/etherdevice.h>
	33	#include <linux/if_ether.h>
	34	#include <linux/if_vlan.h>
	35
	36	#include <net/ip.h>
	37	#include <net/icmp.h>
	38	#include <net/protocol.h>
	39	#include <net/ip_tunnels.h>
	40	#include <net/arp.h>
	41	#include <net/checksum.h>
	42	#include <net/dsfield.h>
	43	#include <net/inet_ecn.h>
	44	#include <net/xfrm.h>
	45	#include <net/net_namespace.h>
	46	#include <net/netns/generic.h>
	47	#include <net/rtnetlink.h>
	48
aad88724	49	int iptunnel_xmit(struct sock sk, struct rtable rt, struct sk_buff *skb,
0e6fbc5b	50	__be32 src, __be32 dst, __u8 proto,
963a88b3	51	__u8 tos, __u8 ttl, __be16 df, bool xnet)
0e6fbc5b PS	52	{
	53	int pkt_len = skb->len;
	54	struct iphdr *iph;
	55	int err;
	56
963a88b3 ND	57	skb_scrub_packet(skb, xnet);
963a88b3 ND	58
7539fadc	59	skb_clear_hash(skb);
0e6fbc5b PS	60	skb_dst_set(skb, &rt->dst);
	61	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
	62
	63	/* Push down and install the IP header. */
78a3694d	64	skb_push(skb, sizeof(struct iphdr));
0e6fbc5b PS	65	skb_reset_network_header(skb);
	66
	67	iph = ip_hdr(skb);
	68
	69	iph->version = 4;
	70	iph->ihl = sizeof(struct iphdr) >> 2;
	71	iph->frag_off = df;
	72	iph->protocol = proto;
	73	iph->tos = tos;
	74	iph->daddr = dst;
	75	iph->saddr = src;
	76	iph->ttl = ttl;
926a882f HFS	77	__ip_select_ident(dev_net(rt->dst.dev), iph,
926a882f HFS	78	skb_shinfo(skb)->gso_segs ?: 1);
0e6fbc5b	79
aad88724	80	err = ip_local_out_sk(sk, skb);
0e6fbc5b PS	81	if (unlikely(net_xmit_eval(err)))
	82	pkt_len = 0;
	83	return pkt_len;
	84	}
	85	EXPORT_SYMBOL_GPL(iptunnel_xmit);
3d7b46cd PS	86
	87	int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
	88	{
	89	if (unlikely(!pskb_may_pull(skb, hdr_len)))
	90	return -ENOMEM;
	91
	92	skb_pull_rcsum(skb, hdr_len);
	93
	94	if (inner_proto == htons(ETH_P_TEB)) {
1245dfc8	95	struct ethhdr *eh;
3d7b46cd PS	96
	97	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
	98	return -ENOMEM;
	99
1245dfc8	100	eh = (struct ethhdr *)skb->data;
d181ddca	101	if (likely(eth_proto_is_802_3(eh->h_proto)))
3d7b46cd PS	102	skb->protocol = eh->h_proto;
	103	else
	104	skb->protocol = htons(ETH_P_802_2);
	105
	106	} else {
	107	skb->protocol = inner_proto;
	108	}
	109
	110	nf_reset(skb);
	111	secpath_reset(skb);
7539fadc	112	skb_clear_hash_if_not_l4(skb);
fbd02dd4	113	skb_dst_drop(skb);
3d7b46cd PS	114	skb->vlan_tci = 0;
	115	skb_set_queue_mapping(skb, 0);
	116	skb->pkt_type = PACKET_HOST;
	117	return 0;
	118	}
	119	EXPORT_SYMBOL_GPL(iptunnel_pull_header);
2d26f0a3 ED	120
	121	struct sk_buff iptunnel_handle_offloads(struct sk_buff skb,
	122	bool csum_help,
	123	int gso_type_mask)
	124	{
	125	int err;
	126
	127	if (likely(!skb->encapsulation)) {
	128	skb_reset_inner_headers(skb);
	129	skb->encapsulation = 1;
	130	}
	131
	132	if (skb_is_gso(skb)) {
	133	err = skb_unclone(skb, GFP_ATOMIC);
	134	if (unlikely(err))
	135	goto error;
	136	skb_shinfo(skb)->gso_type \|= gso_type_mask;
	137	return skb;
	138	}
	139
7e2b10c1 TH	140	/* If packet is not gso and we are resolving any partial checksum,
	141	* clear encapsulation flag. This allows setting CHECKSUM_PARTIAL
	142	* on the outer header without confusing devices that implement
	143	* NETIF_F_IP_CSUM with encapsulation.
	144	*/
	145	if (csum_help)
	146	skb->encapsulation = 0;
	147
2d26f0a3 ED	148	if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) {
	149	err = skb_checksum_help(skb);
	150	if (unlikely(err))
	151	goto error;
	152	} else if (skb->ip_summed != CHECKSUM_PARTIAL)
	153	skb->ip_summed = CHECKSUM_NONE;
	154
	155	return skb;
	156	error:
	157	kfree_skb(skb);
	158	return ERR_PTR(err);
	159	}
	160	EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
ebe44f35 DM	161
	162	/* Often modified stats are per cpu, other are shared (netdev->stats) */
	163	struct rtnl_link_stats64 ip_tunnel_get_stats64(struct net_device dev,
	164	struct rtnl_link_stats64 *tot)
	165	{
	166	int i;
	167
c24a5964 AD	168	netdev_stats_to_stats64(tot, &dev->stats);
c24a5964 AD	169
ebe44f35 DM	170	for_each_possible_cpu(i) {
	171	const struct pcpu_sw_netstats *tstats =
	172	per_cpu_ptr(dev->tstats, i);
	173	u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
	174	unsigned int start;
	175
	176	do {
57a7744e	177	start = u64_stats_fetch_begin_irq(&tstats->syncp);
ebe44f35 DM	178	rx_packets = tstats->rx_packets;
	179	tx_packets = tstats->tx_packets;
	180	rx_bytes = tstats->rx_bytes;
	181	tx_bytes = tstats->tx_bytes;
57a7744e	182	} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
ebe44f35 DM	183
	184	tot->rx_packets += rx_packets;
	185	tot->tx_packets += tx_packets;
	186	tot->rx_bytes += rx_bytes;
	187	tot->tx_bytes += tx_bytes;
	188	}
	189
ebe44f35 DM	190	return tot;
	191	}
	192	EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);