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Commit d1da932e authored by Vlad Yasevich's avatar Vlad Yasevich Committed by David S. Miller
Browse files

ipv6: Separate ipv6 offload support 



Separate IPv6 offload functionality into its own file
in preparation for the move out of the module

Signed-off-by: default avatarVlad Yasevich <vyasevic@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3336288a

net/ipv6/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \ 
		raw.o protocol.o icmp.o mcast.o reassembly.o tcp_ipv6.o \

		exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o



ipv6-offload :=	ip6_offload.o



ipv6-$(CONFIG_SYSCTL) = sysctl_net_ipv6.o

ipv6-$(CONFIG_IPV6_MROUTE) += ip6mr.o
@@ -21,6 +23,7 @@ ipv6-$(CONFIG_PROC_FS) += proc.o 
ipv6-$(CONFIG_SYN_COOKIES) += syncookies.o



ipv6-objs += $(ipv6-y)

ipv6-objs += $(ipv6-offload)



obj-$(CONFIG_INET6_AH) += ah6.o

obj-$(CONFIG_INET6_ESP) += esp6.o

net/ipv6/af_inet6.c

+3 −246
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ 


#include <asm/uaccess.h>

#include <linux/mroute6.h>

#include "ip6_offload.h"



MODULE_AUTHOR("Cast of dozens");

MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
@@ -699,266 +700,22 @@ bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb) 
}

EXPORT_SYMBOL_GPL(ipv6_opt_accepted);



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;



		proto = opth->nexthdr;

		__skb_pull(skb, len);

	}



	return proto;

}



static int ipv6_gso_send_check(struct sk_buff *skb)

{

	const struct ipv6hdr *ipv6h;

	const struct net_offload *ops;

	int err = -EINVAL;



	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))

		goto out;



	ipv6h = ipv6_hdr(skb);

	__skb_pull(skb, sizeof(*ipv6h));

	err = -EPROTONOSUPPORT;



	rcu_read_lock();

	ops = rcu_dereference(inet6_offloads[

		ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);



	if (likely(ops && ops->gso_send_check)) {

		skb_reset_transport_header(skb);

		err = ops->gso_send_check(skb);

	}

	rcu_read_unlock();



out:

	return err;

}



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;



	if (!(features & NETIF_F_V6_CSUM))

		features &= ~NETIF_F_SG;



	if (unlikely(skb_shinfo(skb)->gso_type &

		     ~(SKB_GSO_UDP |

		       SKB_GSO_DODGY |

		       SKB_GSO_TCP_ECN |

		       SKB_GSO_TCPV6 |

		       0)))

		goto out;



	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))

		goto out;



	ipv6h = ipv6_hdr(skb);

	__skb_pull(skb, sizeof(*ipv6h));

	segs = ERR_PTR(-EPROTONOSUPPORT);



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

	rcu_read_lock();

	ops = rcu_dereference(inet6_offloads[proto]);

	if (likely(ops && ops->gso_segment)) {

		skb_reset_transport_header(skb);

		segs = ops->gso_segment(skb, features);

	}

	rcu_read_unlock();



	if (IS_ERR(segs))

		goto out;



	for (skb = segs; skb; skb = skb->next) {

		ipv6h = ipv6_hdr(skb);

		ipv6h->payload_len = htons(skb->len - skb->mac_len -

					   sizeof(*ipv6h));

		if (proto == IPPROTO_UDP) {

			unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);

			fptr = (struct frag_hdr *)(skb_network_header(skb) +

				unfrag_ip6hlen);

			fptr->frag_off = htons(offset);

			if (skb->next != NULL)

				fptr->frag_off |= htons(IP6_MF);

			offset += (ntohs(ipv6h->payload_len) -

				   sizeof(struct frag_hdr));

		}

	}



out:

	return segs;

}



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;

	int flush = 1;

	int proto;

	__wsum csum;



	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_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->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->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 = ipv6_hdr(p);

		first_word = *(__be32 *)iph ^ *(__be32 *)iph2 ;



		/* All fields must match except length and Traffic Class. */

		if (nlen != skb_network_header_len(p) ||

		    (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;

	}



	NAPI_GRO_CB(skb)->flush |= flush;



	csum = skb->csum;

	skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));



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



	skb->csum = csum;



out_unlock:

	rcu_read_unlock();



out:

	NAPI_GRO_CB(skb)->flush |= flush;



	return pp;

}



static int ipv6_gro_complete(struct sk_buff *skb)

{

	const struct net_offload *ops;

	struct ipv6hdr *iph = ipv6_hdr(skb);

	int err = -ENOSYS;



	iph->payload_len = htons(skb->len - skb_network_offset(skb) -

				 sizeof(*iph));



	rcu_read_lock();

	ops = rcu_dereference(inet6_offloads[NAPI_GRO_CB(skb)->proto]);

	if (WARN_ON(!ops || !ops->gro_complete))

		goto out_unlock;



	err = ops->gro_complete(skb);



out_unlock:

	rcu_read_unlock();



	return err;

}



static struct packet_type ipv6_packet_type __read_mostly = {

	.type = cpu_to_be16(ETH_P_IPV6),

	.func = ipv6_rcv,

};



static struct packet_offload ipv6_packet_offload __read_mostly = {

	.type = cpu_to_be16(ETH_P_IPV6),

	.gso_send_check = ipv6_gso_send_check,

	.gso_segment = ipv6_gso_segment,

	.gro_receive = ipv6_gro_receive,

	.gro_complete = ipv6_gro_complete,

};



static int __init ipv6_packet_init(void)

{

	dev_add_offload(&ipv6_packet_offload);

	ipv6_offload_init();

	dev_add_pack(&ipv6_packet_type);

	return 0;

}



static void ipv6_packet_cleanup(void)

{

	ipv6_offload_cleanup();

	dev_remove_pack(&ipv6_packet_type);

	dev_remove_offload(&ipv6_packet_offload);

}



static int __net_init ipv6_init_mibs(struct net *net)

net/ipv6/ip6_offload.c

0 → 100644
+273 −0
Original line number Diff line number Diff line 
/*

 *	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 <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;



		proto = opth->nexthdr;

		__skb_pull(skb, len);

	}



	return proto;

}



static int ipv6_gso_send_check(struct sk_buff *skb)

{

	const struct ipv6hdr *ipv6h;

	const struct net_offload *ops;

	int err = -EINVAL;



	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))

		goto out;



	ipv6h = ipv6_hdr(skb);

	__skb_pull(skb, sizeof(*ipv6h));

	err = -EPROTONOSUPPORT;



	rcu_read_lock();

	ops = rcu_dereference(inet6_offloads[

		ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);



	if (likely(ops && ops->gso_send_check)) {

		skb_reset_transport_header(skb);

		err = ops->gso_send_check(skb);

	}

	rcu_read_unlock();



out:

	return err;

}



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;



	if (!(features & NETIF_F_V6_CSUM))

		features &= ~NETIF_F_SG;



	if (unlikely(skb_shinfo(skb)->gso_type &

		     ~(SKB_GSO_UDP |

		       SKB_GSO_DODGY |

		       SKB_GSO_TCP_ECN |

		       SKB_GSO_TCPV6 |

		       0)))

		goto out;



	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))

		goto out;



	ipv6h = ipv6_hdr(skb);

	__skb_pull(skb, sizeof(*ipv6h));

	segs = ERR_PTR(-EPROTONOSUPPORT);



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

	rcu_read_lock();

	ops = rcu_dereference(inet6_offloads[proto]);

	if (likely(ops && ops->gso_segment)) {

		skb_reset_transport_header(skb);

		segs = ops->gso_segment(skb, features);

	}

	rcu_read_unlock();



	if (IS_ERR(segs))

		goto out;



	for (skb = segs; skb; skb = skb->next) {

		ipv6h = ipv6_hdr(skb);

		ipv6h->payload_len = htons(skb->len - skb->mac_len -

					   sizeof(*ipv6h));

		if (proto == IPPROTO_UDP) {

			unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);

			fptr = (struct frag_hdr *)(skb_network_header(skb) +

				unfrag_ip6hlen);

			fptr->frag_off = htons(offset);

			if (skb->next != NULL)

				fptr->frag_off |= htons(IP6_MF);

			offset += (ntohs(ipv6h->payload_len) -

				   sizeof(struct frag_hdr));

		}

	}



out:

	return segs;

}



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;

	int flush = 1;

	int proto;

	__wsum csum;



	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_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->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->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 = ipv6_hdr(p);

		first_word = *(__be32 *)iph ^ *(__be32 *)iph2 ;



		/* All fields must match except length and Traffic Class. */

		if (nlen != skb_network_header_len(p) ||

		    (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;

	}



	NAPI_GRO_CB(skb)->flush |= flush;



	csum = skb->csum;

	skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));



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



	skb->csum = csum;



out_unlock:

	rcu_read_unlock();



out:

	NAPI_GRO_CB(skb)->flush |= flush;



	return pp;

}



static int ipv6_gro_complete(struct sk_buff *skb)

{

	const struct net_offload *ops;

	struct ipv6hdr *iph = ipv6_hdr(skb);

	int err = -ENOSYS;



	iph->payload_len = htons(skb->len - skb_network_offset(skb) -

				 sizeof(*iph));



	rcu_read_lock();

	ops = rcu_dereference(inet6_offloads[NAPI_GRO_CB(skb)->proto]);

	if (WARN_ON(!ops || !ops->gro_complete))

		goto out_unlock;



	err = ops->gro_complete(skb);



out_unlock:

	rcu_read_unlock();



	return err;

}



static struct packet_offload ipv6_packet_offload __read_mostly = {

	.type = cpu_to_be16(ETH_P_IPV6),

	.gso_send_check = ipv6_gso_send_check,

	.gso_segment = ipv6_gso_segment,

	.gro_receive = ipv6_gro_receive,

	.gro_complete = ipv6_gro_complete,

};



void __init ipv6_offload_init(void)

{

	dev_add_offload(&ipv6_packet_offload);

}



void ipv6_offload_cleanup(void)

{

	dev_remove_offload(&ipv6_packet_offload);

}

net/ipv6/ip6_offload.h

0 → 100644
+17 −0
Original line number Diff line number Diff line 
/*

 *	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.

 */



#ifndef __ip6_offload_h

#define __ip6_offload_h



extern void ipv6_offload_init(void);

extern void ipv6_offload_cleanup(void);



#endif