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: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 246 deletions

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index eb63dac6872..c84d5ba60cd 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -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)