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>
This commit is contained in:
Vlad Yasevich
David S. Miller
parent
3336288a9f
commit
d1da932ed4
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@ -10,6 +10,8 @@ ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
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raw.o protocol.o icmp.o mcast.o reassembly.o tcp_ipv6.o \
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exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o
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ipv6-offload := ip6_offload.o
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ipv6-$(CONFIG_SYSCTL) = sysctl_net_ipv6.o
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ipv6-$(CONFIG_IPV6_MROUTE) += ip6mr.o
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@ -21,6 +23,7 @@ ipv6-$(CONFIG_PROC_FS) += proc.o
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ipv6-$(CONFIG_SYN_COOKIES) += syncookies.o
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ipv6-objs += $(ipv6-y)
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ipv6-objs += $(ipv6-offload)
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obj-$(CONFIG_INET6_AH) += ah6.o
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obj-$(CONFIG_INET6_ESP) += esp6.o
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@ -62,6 +62,7 @@
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#include <asm/uaccess.h>
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#include <linux/mroute6.h>
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#include "ip6_offload.h"
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MODULE_AUTHOR("Cast of dozens");
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MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
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@ -699,266 +700,22 @@ bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
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}
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EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
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static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
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{
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const struct net_offload *ops = NULL;
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for (;;) {
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struct ipv6_opt_hdr *opth;
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int len;
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if (proto != NEXTHDR_HOP) {
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ops = rcu_dereference(inet6_offloads[proto]);
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if (unlikely(!ops))
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break;
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if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
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break;
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}
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if (unlikely(!pskb_may_pull(skb, 8)))
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break;
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opth = (void *)skb->data;
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len = ipv6_optlen(opth);
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if (unlikely(!pskb_may_pull(skb, len)))
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break;
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proto = opth->nexthdr;
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__skb_pull(skb, len);
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}
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return proto;
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}
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static int ipv6_gso_send_check(struct sk_buff *skb)
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{
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const struct ipv6hdr *ipv6h;
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const struct net_offload *ops;
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int err = -EINVAL;
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if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
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goto out;
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ipv6h = ipv6_hdr(skb);
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__skb_pull(skb, sizeof(*ipv6h));
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err = -EPROTONOSUPPORT;
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rcu_read_lock();
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ops = rcu_dereference(inet6_offloads[
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ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
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if (likely(ops && ops->gso_send_check)) {
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skb_reset_transport_header(skb);
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err = ops->gso_send_check(skb);
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}
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rcu_read_unlock();
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out:
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return err;
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}
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static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct ipv6hdr *ipv6h;
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const struct net_offload *ops;
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int proto;
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struct frag_hdr *fptr;
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unsigned int unfrag_ip6hlen;
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u8 *prevhdr;
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int offset = 0;
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if (!(features & NETIF_F_V6_CSUM))
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features &= ~NETIF_F_SG;
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if (unlikely(skb_shinfo(skb)->gso_type &
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~(SKB_GSO_UDP |
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SKB_GSO_DODGY |
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SKB_GSO_TCP_ECN |
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SKB_GSO_TCPV6 |
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0)))
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goto out;
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if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
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goto out;
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ipv6h = ipv6_hdr(skb);
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__skb_pull(skb, sizeof(*ipv6h));
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segs = ERR_PTR(-EPROTONOSUPPORT);
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proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
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rcu_read_lock();
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ops = rcu_dereference(inet6_offloads[proto]);
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if (likely(ops && ops->gso_segment)) {
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skb_reset_transport_header(skb);
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segs = ops->gso_segment(skb, features);
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}
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rcu_read_unlock();
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if (IS_ERR(segs))
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goto out;
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for (skb = segs; skb; skb = skb->next) {
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ipv6h = ipv6_hdr(skb);
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ipv6h->payload_len = htons(skb->len - skb->mac_len -
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sizeof(*ipv6h));
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if (proto == IPPROTO_UDP) {
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unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
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fptr = (struct frag_hdr *)(skb_network_header(skb) +
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unfrag_ip6hlen);
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fptr->frag_off = htons(offset);
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if (skb->next != NULL)
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fptr->frag_off |= htons(IP6_MF);
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offset += (ntohs(ipv6h->payload_len) -
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sizeof(struct frag_hdr));
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}
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}
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out:
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return segs;
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}
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static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
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struct sk_buff *skb)
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{
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const struct net_offload *ops;
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struct sk_buff **pp = NULL;
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struct sk_buff *p;
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struct ipv6hdr *iph;
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unsigned int nlen;
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unsigned int hlen;
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unsigned int off;
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int flush = 1;
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int proto;
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__wsum csum;
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off = skb_gro_offset(skb);
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hlen = off + sizeof(*iph);
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iph = skb_gro_header_fast(skb, off);
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if (skb_gro_header_hard(skb, hlen)) {
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iph = skb_gro_header_slow(skb, hlen, off);
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if (unlikely(!iph))
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goto out;
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}
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skb_gro_pull(skb, sizeof(*iph));
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skb_set_transport_header(skb, skb_gro_offset(skb));
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flush += ntohs(iph->payload_len) != skb_gro_len(skb);
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rcu_read_lock();
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proto = iph->nexthdr;
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ops = rcu_dereference(inet6_offloads[proto]);
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if (!ops || !ops->gro_receive) {
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__pskb_pull(skb, skb_gro_offset(skb));
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proto = ipv6_gso_pull_exthdrs(skb, proto);
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skb_gro_pull(skb, -skb_transport_offset(skb));
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skb_reset_transport_header(skb);
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__skb_push(skb, skb_gro_offset(skb));
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ops = rcu_dereference(inet6_offloads[proto]);
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if (!ops || !ops->gro_receive)
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goto out_unlock;
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iph = ipv6_hdr(skb);
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}
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NAPI_GRO_CB(skb)->proto = proto;
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flush--;
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nlen = skb_network_header_len(skb);
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for (p = *head; p; p = p->next) {
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const struct ipv6hdr *iph2;
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__be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */
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if (!NAPI_GRO_CB(p)->same_flow)
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continue;
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iph2 = ipv6_hdr(p);
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first_word = *(__be32 *)iph ^ *(__be32 *)iph2 ;
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/* All fields must match except length and Traffic Class. */
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if (nlen != skb_network_header_len(p) ||
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(first_word & htonl(0xF00FFFFF)) ||
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memcmp(&iph->nexthdr, &iph2->nexthdr,
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nlen - offsetof(struct ipv6hdr, nexthdr))) {
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NAPI_GRO_CB(p)->same_flow = 0;
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continue;
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}
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/* flush if Traffic Class fields are different */
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NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000));
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NAPI_GRO_CB(p)->flush |= flush;
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}
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NAPI_GRO_CB(skb)->flush |= flush;
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csum = skb->csum;
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skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
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pp = ops->gro_receive(head, skb);
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skb->csum = csum;
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out_unlock:
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rcu_read_unlock();
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out:
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NAPI_GRO_CB(skb)->flush |= flush;
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return pp;
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}
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static int ipv6_gro_complete(struct sk_buff *skb)
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{
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const struct net_offload *ops;
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struct ipv6hdr *iph = ipv6_hdr(skb);
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int err = -ENOSYS;
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iph->payload_len = htons(skb->len - skb_network_offset(skb) -
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sizeof(*iph));
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rcu_read_lock();
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ops = rcu_dereference(inet6_offloads[NAPI_GRO_CB(skb)->proto]);
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if (WARN_ON(!ops || !ops->gro_complete))
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goto out_unlock;
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err = ops->gro_complete(skb);
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out_unlock:
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rcu_read_unlock();
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return err;
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}
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static struct packet_type ipv6_packet_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_IPV6),
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.func = ipv6_rcv,
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};
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static struct packet_offload ipv6_packet_offload __read_mostly = {
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.type = cpu_to_be16(ETH_P_IPV6),
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.gso_send_check = ipv6_gso_send_check,
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.gso_segment = ipv6_gso_segment,
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.gro_receive = ipv6_gro_receive,
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.gro_complete = ipv6_gro_complete,
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};
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static int __init ipv6_packet_init(void)
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{
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dev_add_offload(&ipv6_packet_offload);
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ipv6_offload_init();
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dev_add_pack(&ipv6_packet_type);
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return 0;
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}
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static void ipv6_packet_cleanup(void)
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{
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ipv6_offload_cleanup();
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dev_remove_pack(&ipv6_packet_type);
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dev_remove_offload(&ipv6_packet_offload);
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}
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static int __net_init ipv6_init_mibs(struct net *net)
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@ -0,0 +1,273 @@
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/*
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* IPV6 GSO/GRO offload support
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* Linux INET6 implementation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/socket.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <net/protocol.h>
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#include <net/ipv6.h>
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#include "ip6_offload.h"
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static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
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{
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const struct net_offload *ops = NULL;
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for (;;) {
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struct ipv6_opt_hdr *opth;
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int len;
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if (proto != NEXTHDR_HOP) {
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ops = rcu_dereference(inet6_offloads[proto]);
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if (unlikely(!ops))
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break;
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if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
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break;
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}
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if (unlikely(!pskb_may_pull(skb, 8)))
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break;
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opth = (void *)skb->data;
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len = ipv6_optlen(opth);
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if (unlikely(!pskb_may_pull(skb, len)))
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break;
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proto = opth->nexthdr;
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__skb_pull(skb, len);
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}
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return proto;
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}
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static int ipv6_gso_send_check(struct sk_buff *skb)
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{
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const struct ipv6hdr *ipv6h;
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const struct net_offload *ops;
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int err = -EINVAL;
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if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
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goto out;
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ipv6h = ipv6_hdr(skb);
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__skb_pull(skb, sizeof(*ipv6h));
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err = -EPROTONOSUPPORT;
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rcu_read_lock();
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ops = rcu_dereference(inet6_offloads[
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ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
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if (likely(ops && ops->gso_send_check)) {
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skb_reset_transport_header(skb);
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err = ops->gso_send_check(skb);
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}
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rcu_read_unlock();
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out:
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return err;
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}
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static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct ipv6hdr *ipv6h;
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const struct net_offload *ops;
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int proto;
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struct frag_hdr *fptr;
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unsigned int unfrag_ip6hlen;
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u8 *prevhdr;
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int offset = 0;
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if (!(features & NETIF_F_V6_CSUM))
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features &= ~NETIF_F_SG;
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if (unlikely(skb_shinfo(skb)->gso_type &
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~(SKB_GSO_UDP |
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SKB_GSO_DODGY |
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SKB_GSO_TCP_ECN |
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SKB_GSO_TCPV6 |
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0)))
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goto out;
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if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
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goto out;
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ipv6h = ipv6_hdr(skb);
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__skb_pull(skb, sizeof(*ipv6h));
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segs = ERR_PTR(-EPROTONOSUPPORT);
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proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
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rcu_read_lock();
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ops = rcu_dereference(inet6_offloads[proto]);
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if (likely(ops && ops->gso_segment)) {
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skb_reset_transport_header(skb);
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segs = ops->gso_segment(skb, features);
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}
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rcu_read_unlock();
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if (IS_ERR(segs))
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goto out;
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for (skb = segs; skb; skb = skb->next) {
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ipv6h = ipv6_hdr(skb);
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ipv6h->payload_len = htons(skb->len - skb->mac_len -
|
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sizeof(*ipv6h));
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if (proto == IPPROTO_UDP) {
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unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
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fptr = (struct frag_hdr *)(skb_network_header(skb) +
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unfrag_ip6hlen);
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fptr->frag_off = htons(offset);
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if (skb->next != NULL)
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fptr->frag_off |= htons(IP6_MF);
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offset += (ntohs(ipv6h->payload_len) -
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sizeof(struct frag_hdr));
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}
|
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}
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out:
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return segs;
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}
|
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static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
|
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struct sk_buff *skb)
|
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{
|
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const struct net_offload *ops;
|
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struct sk_buff **pp = NULL;
|
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struct sk_buff *p;
|
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struct ipv6hdr *iph;
|
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unsigned int nlen;
|
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unsigned int hlen;
|
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unsigned int off;
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int flush = 1;
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int proto;
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__wsum csum;
|
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off = skb_gro_offset(skb);
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hlen = off + sizeof(*iph);
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iph = skb_gro_header_fast(skb, off);
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if (skb_gro_header_hard(skb, hlen)) {
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iph = skb_gro_header_slow(skb, hlen, off);
|
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if (unlikely(!iph))
|
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goto out;
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}
|
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skb_gro_pull(skb, sizeof(*iph));
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skb_set_transport_header(skb, skb_gro_offset(skb));
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flush += ntohs(iph->payload_len) != skb_gro_len(skb);
|
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rcu_read_lock();
|
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proto = iph->nexthdr;
|
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ops = rcu_dereference(inet6_offloads[proto]);
|
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if (!ops || !ops->gro_receive) {
|
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__pskb_pull(skb, skb_gro_offset(skb));
|
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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);
|
||||
}
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
/*
|
||||
* 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
|
||||
Loading…
Reference in New Issue