[people/ms/linux.git] / net / ipv6 / ip6_offload.c

/*
 *	IPV6 GSO/GRO offload support
 *	Linux INET6 implementation
 *
 *	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.
 */

#include <linux/kernel.h>
#include <linux/socket.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/printk.h>

#include <net/protocol.h>
#include <net/ipv6.h>

#include "ip6_offload.h"

static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
{
	const struct net_offload *ops = NULL;

	for (;;) {
		struct ipv6_opt_hdr *opth;
		int len;

		if (proto != NEXTHDR_HOP) {
			ops = rcu_dereference(inet6_offloads[proto]);

			if (unlikely(!ops))
				break;

			if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
				break;
		}

		if (unlikely(!pskb_may_pull(skb, 8)))
			break;

		opth = (void *)skb->data;
		len = ipv6_optlen(opth);

		if (unlikely(!pskb_may_pull(skb, len)))
			break;

		opth = (void *)skb->data;
		proto = opth->nexthdr;
		__skb_pull(skb, len);
	}

	return proto;
}

static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
	netdev_features_t features)
{
	struct sk_buff *segs = ERR_PTR(-EINVAL);
	struct ipv6hdr *ipv6h;
	const struct net_offload *ops;
	int proto;
	struct frag_hdr *fptr;
	unsigned int unfrag_ip6hlen;
	u8 *prevhdr;
	int offset = 0;
	bool encap, udpfrag;
	int nhoff;

	if (unlikely(skb_shinfo(skb)->gso_type &
		     ~(SKB_GSO_TCPV4 |
		       SKB_GSO_UDP |
		       SKB_GSO_DODGY |
		       SKB_GSO_TCP_ECN |
		       SKB_GSO_GRE |
		       SKB_GSO_GRE_CSUM |
		       SKB_GSO_IPIP |
		       SKB_GSO_SIT |
		       SKB_GSO_UDP_TUNNEL |
		       SKB_GSO_UDP_TUNNEL_CSUM |
		       SKB_GSO_TUNNEL_REMCSUM |
		       SKB_GSO_TCPV6 |
		       0)))
		goto out;

	skb_reset_network_header(skb);
	nhoff = skb_network_header(skb) - skb_mac_header(skb);
	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
		goto out;

	encap = SKB_GSO_CB(skb)->encap_level > 0;
	if (encap)
		features &= skb->dev->hw_enc_features;
	SKB_GSO_CB(skb)->encap_level += sizeof(*ipv6h);

	ipv6h = ipv6_hdr(skb);
	__skb_pull(skb, sizeof(*ipv6h));
	segs = ERR_PTR(-EPROTONOSUPPORT);

	proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);

	if (skb->encapsulation &&
	    skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP))
		udpfrag = proto == IPPROTO_UDP && encap;
	else
		udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;

	ops = rcu_dereference(inet6_offloads[proto]);
	if (likely(ops && ops->callbacks.gso_segment)) {
		skb_reset_transport_header(skb);
		segs = ops->callbacks.gso_segment(skb, features);
	}

	if (IS_ERR(segs))
		goto out;

	for (skb = segs; skb; skb = skb->next) {
		ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
		ipv6h->payload_len = htons(skb->len - nhoff - sizeof(*ipv6h));
		skb->network_header = (u8 *)ipv6h - skb->head;

		if (udpfrag) {
			unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
			fptr = (struct frag_hdr *)((u8 *)ipv6h + unfrag_ip6hlen);
			fptr->frag_off = htons(offset);
			if (skb->next)
				fptr->frag_off |= htons(IP6_MF);
			offset += (ntohs(ipv6h->payload_len) -
				   sizeof(struct frag_hdr));
		}
		if (encap)
			skb_reset_inner_headers(skb);
	}

out:
	return segs;
}

/* Return the total length of all the extension hdrs, following the same
 * logic in ipv6_gso_pull_exthdrs() when parsing ext-hdrs.
 */
static int ipv6_exthdrs_len(struct ipv6hdr *iph,
			    const struct net_offload **opps)
{
	struct ipv6_opt_hdr *opth = (void *)iph;
	int len = 0, proto, optlen = sizeof(*iph);

	proto = iph->nexthdr;
	for (;;) {
		if (proto != NEXTHDR_HOP) {
			*opps = rcu_dereference(inet6_offloads[proto]);
			if (unlikely(!(*opps)))
				break;
			if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
				break;
		}
		opth = (void *)opth + optlen;
		optlen = ipv6_optlen(opth);
		len += optlen;
		proto = opth->nexthdr;
	}
	return len;
}

static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
					 struct sk_buff *skb)
{
	const struct net_offload *ops;
	struct sk_buff **pp = NULL;
	struct sk_buff *p;
	struct ipv6hdr *iph;
	unsigned int nlen;
	unsigned int hlen;
	unsigned int off;
	u16 flush = 1;
	int proto;

	off = skb_gro_offset(skb);
	hlen = off + sizeof(*iph);
	iph = skb_gro_header_fast(skb, off);
	if (skb_gro_header_hard(skb, hlen)) {
		iph = skb_gro_header_slow(skb, hlen, off);
		if (unlikely(!iph))
			goto out;
	}

	skb_set_network_header(skb, off);
	skb_gro_pull(skb, sizeof(*iph));
	skb_set_transport_header(skb, skb_gro_offset(skb));

	flush += ntohs(iph->payload_len) != skb_gro_len(skb);

	rcu_read_lock();
	proto = iph->nexthdr;
	ops = rcu_dereference(inet6_offloads[proto]);
	if (!ops || !ops->callbacks.gro_receive) {
		__pskb_pull(skb, skb_gro_offset(skb));
		proto = ipv6_gso_pull_exthdrs(skb, proto);
		skb_gro_pull(skb, -skb_transport_offset(skb));
		skb_reset_transport_header(skb);
		__skb_push(skb, skb_gro_offset(skb));

		ops = rcu_dereference(inet6_offloads[proto]);
		if (!ops || !ops->callbacks.gro_receive)
			goto out_unlock;

		iph = ipv6_hdr(skb);
	}

	NAPI_GRO_CB(skb)->proto = proto;

	flush--;
	nlen = skb_network_header_len(skb);

	for (p = *head; p; p = p->next) {
		const struct ipv6hdr *iph2;
		__be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */

		if (!NAPI_GRO_CB(p)->same_flow)
			continue;

		iph2 = (struct ipv6hdr *)(p->data + off);
		first_word = *(__be32 *)iph ^ *(__be32 *)iph2;

		/* All fields must match except length and Traffic Class.
		 * XXX skbs on the gro_list have all been parsed and pulled
		 * already so we don't need to compare nlen
		 * (nlen != (sizeof(*iph2) + ipv6_exthdrs_len(iph2, &ops)))
		 * memcmp() alone below is suffcient, right?
		 */
		 if ((first_word & htonl(0xF00FFFFF)) ||
		    memcmp(&iph->nexthdr, &iph2->nexthdr,
			   nlen - offsetof(struct ipv6hdr, nexthdr))) {
			NAPI_GRO_CB(p)->same_flow = 0;
			continue;
		}
		/* flush if Traffic Class fields are different */
		NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000));
		NAPI_GRO_CB(p)->flush |= flush;

		/* Clear flush_id, there's really no concept of ID in IPv6. */
		NAPI_GRO_CB(p)->flush_id = 0;
	}

	NAPI_GRO_CB(skb)->flush |= flush;

	skb_gro_postpull_rcsum(skb, iph, nlen);

	pp = ops->callbacks.gro_receive(head, skb);

out_unlock:
	rcu_read_unlock();

out:
	NAPI_GRO_CB(skb)->flush |= flush;

	return pp;
}

static int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
{
	const struct net_offload *ops;
	struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + nhoff);
	int err = -ENOSYS;

	if (skb->encapsulation)
		skb_set_inner_network_header(skb, nhoff);

	iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));

	rcu_read_lock();

	nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
	if (WARN_ON(!ops || !ops->callbacks.gro_complete))
		goto out_unlock;

	err = ops->callbacks.gro_complete(skb, nhoff);

out_unlock:
	rcu_read_unlock();

	return err;
}

static int sit_gro_complete(struct sk_buff *skb, int nhoff)
{
	skb->encapsulation = 1;
	skb_shinfo(skb)->gso_type |= SKB_GSO_SIT;
	return ipv6_gro_complete(skb, nhoff);
}

static struct packet_offload ipv6_packet_offload __read_mostly = {
	.type = cpu_to_be16(ETH_P_IPV6),
	.callbacks = {
		.gso_segment = ipv6_gso_segment,
		.gro_receive = ipv6_gro_receive,
		.gro_complete = ipv6_gro_complete,
	},
};

static const struct net_offload sit_offload = {
	.callbacks = {
		.gso_segment	= ipv6_gso_segment,
		.gro_receive    = ipv6_gro_receive,
		.gro_complete   = sit_gro_complete,
	},
};

static int __init ipv6_offload_init(void)
{

	if (tcpv6_offload_init() < 0)
		pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
	if (udp_offload_init() < 0)
		pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
	if (ipv6_exthdrs_offload_init() < 0)
		pr_crit("%s: Cannot add EXTHDRS protocol offload\n", __func__);

	dev_add_offload(&ipv6_packet_offload);

	inet_add_offload(&sit_offload, IPPROTO_IPV6);

	return 0;
}

fs_initcall(ipv6_offload_init);
Commit	Line	Data
d1da932e VY	1	/*
	2	* IPV6 GSO/GRO offload support
	3	* Linux INET6 implementation
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License
	7	* as published by the Free Software Foundation; either version
	8	* 2 of the License, or (at your option) any later version.
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/socket.h>
	13	#include <linux/netdevice.h>
	14	#include <linux/skbuff.h>
c6b641a4	15	#include <linux/printk.h>
d1da932e VY	16
	17	#include <net/protocol.h>
	18	#include <net/ipv6.h>
	19
	20	#include "ip6_offload.h"
	21
	22	static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
	23	{
	24	const struct net_offload *ops = NULL;
	25
	26	for (;;) {
	27	struct ipv6_opt_hdr *opth;
	28	int len;
	29
	30	if (proto != NEXTHDR_HOP) {
	31	ops = rcu_dereference(inet6_offloads[proto]);
	32
	33	if (unlikely(!ops))
	34	break;
	35
	36	if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
	37	break;
	38	}
	39
	40	if (unlikely(!pskb_may_pull(skb, 8)))
	41	break;
	42
	43	opth = (void *)skb->data;
	44	len = ipv6_optlen(opth);
	45
	46	if (unlikely(!pskb_may_pull(skb, len)))
	47	break;
	48
fc6fb41c	49	opth = (void *)skb->data;
d1da932e VY	50	proto = opth->nexthdr;
	51	__skb_pull(skb, len);
	52	}
	53
	54	return proto;
	55	}
	56
d1da932e VY	57	static struct sk_buff ipv6_gso_segment(struct sk_buff skb,
	58	netdev_features_t features)
	59	{
	60	struct sk_buff *segs = ERR_PTR(-EINVAL);
	61	struct ipv6hdr *ipv6h;
	62	const struct net_offload *ops;
	63	int proto;
	64	struct frag_hdr *fptr;
	65	unsigned int unfrag_ip6hlen;
	66	u8 *prevhdr;
	67	int offset = 0;
91a48a2e	68	bool encap, udpfrag;
d3e5e006	69	int nhoff;
d1da932e	70
d1da932e	71	if (unlikely(skb_shinfo(skb)->gso_type &
b6fef4c6 AD	72	~(SKB_GSO_TCPV4 \|
b6fef4c6 AD	73	SKB_GSO_UDP \|
d1da932e VY	74	SKB_GSO_DODGY \|
d1da932e VY	75	SKB_GSO_TCP_ECN \|
68c33163	76	SKB_GSO_GRE \|
4749c09c	77	SKB_GSO_GRE_CSUM \|
cb32f511	78	SKB_GSO_IPIP \|
61c1db7f	79	SKB_GSO_SIT \|
73136267	80	SKB_GSO_UDP_TUNNEL \|
0f4f4ffa	81	SKB_GSO_UDP_TUNNEL_CSUM \|
e585f236	82	SKB_GSO_TUNNEL_REMCSUM \|
d1da932e VY	83	SKB_GSO_TCPV6 \|
	84	0)))
	85	goto out;
	86
d3e5e006 ED	87	skb_reset_network_header(skb);
d3e5e006 ED	88	nhoff = skb_network_header(skb) - skb_mac_header(skb);
d1da932e VY	89	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
	90	goto out;
	91
91a48a2e HFS	92	encap = SKB_GSO_CB(skb)->encap_level > 0;
91a48a2e HFS	93	if (encap)
1e16aa3d	94	features &= skb->dev->hw_enc_features;
d3e5e006 ED	95	SKB_GSO_CB(skb)->encap_level += sizeof(*ipv6h);
d3e5e006 ED	96
d1da932e VY	97	ipv6h = ipv6_hdr(skb);
	98	__skb_pull(skb, sizeof(*ipv6h));
	99	segs = ERR_PTR(-EPROTONOSUPPORT);
	100
	101	proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
b917eb15	102
91a48a2e HFS	103	if (skb->encapsulation &&
	104	skb_shinfo(skb)->gso_type & (SKB_GSO_SIT\|SKB_GSO_IPIP))
	105	udpfrag = proto == IPPROTO_UDP && encap;
	106	else
	107	udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
	108
d1da932e	109	ops = rcu_dereference(inet6_offloads[proto]);
f191a1d1	110	if (likely(ops && ops->callbacks.gso_segment)) {
d1da932e	111	skb_reset_transport_header(skb);
f191a1d1	112	segs = ops->callbacks.gso_segment(skb, features);
d1da932e	113	}
d1da932e VY	114
	115	if (IS_ERR(segs))
	116	goto out;
	117
	118	for (skb = segs; skb; skb = skb->next) {
d3e5e006 ED	119	ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
d3e5e006 ED	120	ipv6h->payload_len = htons(skb->len - nhoff - sizeof(*ipv6h));
d3e5e006 ED	121	skb->network_header = (u8 *)ipv6h - skb->head;
d3e5e006 ED	122
91a48a2e	123	if (udpfrag) {
d1da932e	124	unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
d3e5e006	125	fptr = (struct frag_hdr )((u8 )ipv6h + unfrag_ip6hlen);
d1da932e	126	fptr->frag_off = htons(offset);
53b24b8f	127	if (skb->next)
d1da932e VY	128	fptr->frag_off \|= htons(IP6_MF);
	129	offset += (ntohs(ipv6h->payload_len) -
	130	sizeof(struct frag_hdr));
	131	}
91a48a2e HFS	132	if (encap)
91a48a2e HFS	133	skb_reset_inner_headers(skb);
d1da932e VY	134	}
	135
	136	out:
	137	return segs;
	138	}
	139
299603e8 JC	140	/* Return the total length of all the extension hdrs, following the same
	141	* logic in ipv6_gso_pull_exthdrs() when parsing ext-hdrs.
	142	*/
	143	static int ipv6_exthdrs_len(struct ipv6hdr *iph,
	144	const struct net_offload **opps)
	145	{
810c23a3 JC	146	struct ipv6_opt_hdr opth = (void )iph;
810c23a3 JC	147	int len = 0, proto, optlen = sizeof(*iph);
299603e8 JC	148
	149	proto = iph->nexthdr;
	150	for (;;) {
	151	if (proto != NEXTHDR_HOP) {
	152	*opps = rcu_dereference(inet6_offloads[proto]);
	153	if (unlikely(!(*opps)))
	154	break;
	155	if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
	156	break;
	157	}
810c23a3 JC	158	opth = (void *)opth + optlen;
810c23a3 JC	159	optlen = ipv6_optlen(opth);
299603e8 JC	160	len += optlen;
	161	proto = opth->nexthdr;
	162	}
	163	return len;
	164	}
	165
d1da932e VY	166	static struct sk_buff ipv6_gro_receive(struct sk_buff head,
	167	struct sk_buff *skb)
	168	{
	169	const struct net_offload *ops;
	170	struct sk_buff **pp = NULL;
	171	struct sk_buff *p;
	172	struct ipv6hdr *iph;
	173	unsigned int nlen;
	174	unsigned int hlen;
	175	unsigned int off;
bf5a755f	176	u16 flush = 1;
d1da932e	177	int proto;
d1da932e VY	178
	179	off = skb_gro_offset(skb);
	180	hlen = off + sizeof(*iph);
	181	iph = skb_gro_header_fast(skb, off);
	182	if (skb_gro_header_hard(skb, hlen)) {
	183	iph = skb_gro_header_slow(skb, hlen, off);
	184	if (unlikely(!iph))
	185	goto out;
	186	}
	187
299603e8	188	skb_set_network_header(skb, off);
d1da932e VY	189	skb_gro_pull(skb, sizeof(*iph));
	190	skb_set_transport_header(skb, skb_gro_offset(skb));
	191
	192	flush += ntohs(iph->payload_len) != skb_gro_len(skb);
	193
	194	rcu_read_lock();
	195	proto = iph->nexthdr;
	196	ops = rcu_dereference(inet6_offloads[proto]);
f191a1d1	197	if (!ops \|\| !ops->callbacks.gro_receive) {
d1da932e VY	198	__pskb_pull(skb, skb_gro_offset(skb));
	199	proto = ipv6_gso_pull_exthdrs(skb, proto);
	200	skb_gro_pull(skb, -skb_transport_offset(skb));
	201	skb_reset_transport_header(skb);
	202	__skb_push(skb, skb_gro_offset(skb));
	203
	204	ops = rcu_dereference(inet6_offloads[proto]);
f191a1d1	205	if (!ops \|\| !ops->callbacks.gro_receive)
d1da932e VY	206	goto out_unlock;
	207
	208	iph = ipv6_hdr(skb);
	209	}
	210
	211	NAPI_GRO_CB(skb)->proto = proto;
	212
	213	flush--;
	214	nlen = skb_network_header_len(skb);
	215
	216	for (p = *head; p; p = p->next) {
	217	const struct ipv6hdr *iph2;
	218	__be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */
	219
	220	if (!NAPI_GRO_CB(p)->same_flow)
	221	continue;
	222
299603e8	223	iph2 = (struct ipv6hdr *)(p->data + off);
67ba4152	224	first_word = (__be32 )iph ^ (__be32 )iph2;
d1da932e	225
299603e8 JC	226	/* All fields must match except length and Traffic Class.
	227	* XXX skbs on the gro_list have all been parsed and pulled
	228	* already so we don't need to compare nlen
	229	* (nlen != (sizeof(*iph2) + ipv6_exthdrs_len(iph2, &ops)))
	230	* memcmp() alone below is suffcient, right?
	231	*/
	232	if ((first_word & htonl(0xF00FFFFF)) \|\|
d1da932e VY	233	memcmp(&iph->nexthdr, &iph2->nexthdr,
	234	nlen - offsetof(struct ipv6hdr, nexthdr))) {
	235	NAPI_GRO_CB(p)->same_flow = 0;
	236	continue;
	237	}
	238	/* flush if Traffic Class fields are different */
	239	NAPI_GRO_CB(p)->flush \|= !!(first_word & htonl(0x0FF00000));
	240	NAPI_GRO_CB(p)->flush \|= flush;
03d56daa TH	241
	242	/* Clear flush_id, there's really no concept of ID in IPv6. */
	243	NAPI_GRO_CB(p)->flush_id = 0;
d1da932e VY	244	}
	245
	246	NAPI_GRO_CB(skb)->flush \|= flush;
	247
4de462ab	248	skb_gro_postpull_rcsum(skb, iph, nlen);
d1da932e	249
f191a1d1	250	pp = ops->callbacks.gro_receive(head, skb);
d1da932e	251
d1da932e VY	252	out_unlock:
	253	rcu_read_unlock();
	254
	255	out:
	256	NAPI_GRO_CB(skb)->flush \|= flush;
	257
	258	return pp;
	259	}
	260
299603e8	261	static int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
d1da932e VY	262	{
d1da932e VY	263	const struct net_offload *ops;
299603e8	264	struct ipv6hdr iph = (struct ipv6hdr )(skb->data + nhoff);
d1da932e VY	265	int err = -ENOSYS;
d1da932e VY	266
feec0cb3 ED	267	if (skb->encapsulation)
	268	skb_set_inner_network_header(skb, nhoff);
	269
299603e8	270	iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));
d1da932e VY	271
d1da932e VY	272	rcu_read_lock();
299603e8 JC	273
299603e8 JC	274	nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
f191a1d1	275	if (WARN_ON(!ops \|\| !ops->callbacks.gro_complete))
d1da932e VY	276	goto out_unlock;
d1da932e VY	277
299603e8	278	err = ops->callbacks.gro_complete(skb, nhoff);
d1da932e VY	279
	280	out_unlock:
	281	rcu_read_unlock();
	282
	283	return err;
	284	}
	285
feec0cb3 ED	286	static int sit_gro_complete(struct sk_buff *skb, int nhoff)
	287	{
	288	skb->encapsulation = 1;
	289	skb_shinfo(skb)->gso_type \|= SKB_GSO_SIT;
	290	return ipv6_gro_complete(skb, nhoff);
	291	}
	292
d1da932e VY	293	static struct packet_offload ipv6_packet_offload __read_mostly = {
d1da932e VY	294	.type = cpu_to_be16(ETH_P_IPV6),
f191a1d1	295	.callbacks = {
f191a1d1 VY	296	.gso_segment = ipv6_gso_segment,
	297	.gro_receive = ipv6_gro_receive,
	298	.gro_complete = ipv6_gro_complete,
	299	},
d1da932e VY	300	};
d1da932e VY	301
61c1db7f ED	302	static const struct net_offload sit_offload = {
61c1db7f ED	303	.callbacks = {
61c1db7f	304	.gso_segment = ipv6_gso_segment,
feec0cb3 ED	305	.gro_receive = ipv6_gro_receive,
feec0cb3 ED	306	.gro_complete = sit_gro_complete,
61c1db7f ED	307	},
	308	};
	309
c6b641a4	310	static int __init ipv6_offload_init(void)
d1da932e	311	{
c6b641a4 VY	312
	313	if (tcpv6_offload_init() < 0)
	314	pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
	315	if (udp_offload_init() < 0)
	316	pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
	317	if (ipv6_exthdrs_offload_init() < 0)
	318	pr_crit("%s: Cannot add EXTHDRS protocol offload\n", __func__);
	319
d1da932e	320	dev_add_offload(&ipv6_packet_offload);
61c1db7f ED	321
	322	inet_add_offload(&sit_offload, IPPROTO_IPV6);
	323
c6b641a4	324	return 0;
d1da932e VY	325	}
d1da932e VY	326
c6b641a4	327	fs_initcall(ipv6_offload_init);