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446 lines
11 KiB
446 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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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#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 <linux/printk.h> |
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#include <net/protocol.h> |
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#include <net/ipv6.h> |
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#include <net/inet_common.h> |
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#include <net/tcp.h> |
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#include <net/udp.h> |
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#include <net/gro.h> |
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#include "ip6_offload.h" |
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/* All GRO functions are always builtin, except UDP over ipv6, which lays in |
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* ipv6 module, as it depends on UDPv6 lookup function, so we need special care |
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* when ipv6 is built as a module |
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*/ |
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#if IS_BUILTIN(CONFIG_IPV6) |
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#define INDIRECT_CALL_L4(f, f2, f1, ...) INDIRECT_CALL_2(f, f2, f1, __VA_ARGS__) |
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#else |
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#define INDIRECT_CALL_L4(f, f2, f1, ...) INDIRECT_CALL_1(f, f2, __VA_ARGS__) |
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#endif |
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#define indirect_call_gro_receive_l4(f2, f1, cb, head, skb) \ |
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({ \ |
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unlikely(gro_recursion_inc_test(skb)) ? \ |
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NAPI_GRO_CB(skb)->flush |= 1, NULL : \ |
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INDIRECT_CALL_L4(cb, f2, f1, head, skb); \ |
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}) |
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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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opth = (void *)skb->data; |
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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 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 payload_len; |
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u8 *prevhdr; |
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int offset = 0; |
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bool encap, udpfrag; |
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int nhoff; |
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bool gso_partial; |
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skb_reset_network_header(skb); |
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nhoff = skb_network_header(skb) - skb_mac_header(skb); |
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if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) |
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goto out; |
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encap = SKB_GSO_CB(skb)->encap_level > 0; |
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if (encap) |
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features &= skb->dev->hw_enc_features; |
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SKB_GSO_CB(skb)->encap_level += sizeof(*ipv6h); |
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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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if (skb->encapsulation && |
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skb_shinfo(skb)->gso_type & (SKB_GSO_IPXIP4 | SKB_GSO_IPXIP6)) |
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udpfrag = proto == IPPROTO_UDP && encap && |
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(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); |
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else |
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udpfrag = proto == IPPROTO_UDP && !skb->encapsulation && |
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(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); |
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ops = rcu_dereference(inet6_offloads[proto]); |
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if (likely(ops && ops->callbacks.gso_segment)) { |
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skb_reset_transport_header(skb); |
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segs = ops->callbacks.gso_segment(skb, features); |
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} |
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if (IS_ERR_OR_NULL(segs)) |
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goto out; |
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gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); |
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for (skb = segs; skb; skb = skb->next) { |
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ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff); |
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if (gso_partial && skb_is_gso(skb)) |
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payload_len = skb_shinfo(skb)->gso_size + |
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SKB_GSO_CB(skb)->data_offset + |
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skb->head - (unsigned char *)(ipv6h + 1); |
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else |
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payload_len = skb->len - nhoff - sizeof(*ipv6h); |
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ipv6h->payload_len = htons(payload_len); |
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skb->network_header = (u8 *)ipv6h - skb->head; |
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skb_reset_mac_len(skb); |
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if (udpfrag) { |
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int err = ip6_find_1stfragopt(skb, &prevhdr); |
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if (err < 0) { |
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kfree_skb_list(segs); |
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return ERR_PTR(err); |
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} |
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fptr = (struct frag_hdr *)((u8 *)ipv6h + err); |
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fptr->frag_off = htons(offset); |
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if (skb->next) |
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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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if (encap) |
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skb_reset_inner_headers(skb); |
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} |
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out: |
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return segs; |
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} |
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/* Return the total length of all the extension hdrs, following the same |
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* logic in ipv6_gso_pull_exthdrs() when parsing ext-hdrs. |
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*/ |
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static int ipv6_exthdrs_len(struct ipv6hdr *iph, |
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const struct net_offload **opps) |
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{ |
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struct ipv6_opt_hdr *opth = (void *)iph; |
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int len = 0, proto, optlen = sizeof(*iph); |
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proto = iph->nexthdr; |
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for (;;) { |
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if (proto != NEXTHDR_HOP) { |
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*opps = rcu_dereference(inet6_offloads[proto]); |
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if (unlikely(!(*opps))) |
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break; |
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if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR)) |
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break; |
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} |
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opth = (void *)opth + optlen; |
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optlen = ipv6_optlen(opth); |
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len += optlen; |
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proto = opth->nexthdr; |
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} |
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return len; |
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} |
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INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *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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u16 flush = 1; |
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int proto; |
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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_set_network_header(skb, off); |
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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->callbacks.gro_receive) { |
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__pskb_pull(skb, skb_gro_offset(skb)); |
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skb_gro_frag0_invalidate(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->callbacks.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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list_for_each_entry(p, head, list) { |
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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 = (struct ipv6hdr *)(p->data + off); |
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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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* XXX skbs on the gro_list have all been parsed and pulled |
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* already so we don't need to compare nlen |
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* (nlen != (sizeof(*iph2) + ipv6_exthdrs_len(iph2, &ops))) |
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* memcmp() alone below is sufficient, right? |
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*/ |
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if ((first_word & htonl(0xF00FFFFF)) || |
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!ipv6_addr_equal(&iph->saddr, &iph2->saddr) || |
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!ipv6_addr_equal(&iph->daddr, &iph2->daddr) || |
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*(u16 *)&iph->nexthdr != *(u16 *)&iph2->nexthdr) { |
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not_same_flow: |
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NAPI_GRO_CB(p)->same_flow = 0; |
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continue; |
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} |
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if (unlikely(nlen > sizeof(struct ipv6hdr))) { |
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if (memcmp(iph + 1, iph2 + 1, |
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nlen - sizeof(struct ipv6hdr))) |
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goto not_same_flow; |
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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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/* If the previous IP ID value was based on an atomic |
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* datagram we can overwrite the value and ignore it. |
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*/ |
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if (NAPI_GRO_CB(skb)->is_atomic) |
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NAPI_GRO_CB(p)->flush_id = 0; |
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} |
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NAPI_GRO_CB(skb)->is_atomic = true; |
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NAPI_GRO_CB(skb)->flush |= flush; |
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skb_gro_postpull_rcsum(skb, iph, nlen); |
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pp = indirect_call_gro_receive_l4(tcp6_gro_receive, udp6_gro_receive, |
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ops->callbacks.gro_receive, head, skb); |
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out_unlock: |
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rcu_read_unlock(); |
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out: |
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skb_gro_flush_final(skb, pp, flush); |
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return pp; |
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} |
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static struct sk_buff *sit_ip6ip6_gro_receive(struct list_head *head, |
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struct sk_buff *skb) |
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{ |
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/* Common GRO receive for SIT and IP6IP6 */ |
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if (NAPI_GRO_CB(skb)->encap_mark) { |
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NAPI_GRO_CB(skb)->flush = 1; |
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return NULL; |
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} |
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NAPI_GRO_CB(skb)->encap_mark = 1; |
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return ipv6_gro_receive(head, skb); |
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} |
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static struct sk_buff *ip4ip6_gro_receive(struct list_head *head, |
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struct sk_buff *skb) |
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{ |
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/* Common GRO receive for SIT and IP6IP6 */ |
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if (NAPI_GRO_CB(skb)->encap_mark) { |
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NAPI_GRO_CB(skb)->flush = 1; |
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return NULL; |
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} |
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NAPI_GRO_CB(skb)->encap_mark = 1; |
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return inet_gro_receive(head, skb); |
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} |
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INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff) |
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{ |
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const struct net_offload *ops; |
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struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + nhoff); |
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int err = -ENOSYS; |
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if (skb->encapsulation) { |
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skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IPV6)); |
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skb_set_inner_network_header(skb, nhoff); |
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} |
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iph->payload_len = htons(skb->len - nhoff - sizeof(*iph)); |
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rcu_read_lock(); |
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nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops); |
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if (WARN_ON(!ops || !ops->callbacks.gro_complete)) |
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goto out_unlock; |
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err = INDIRECT_CALL_L4(ops->callbacks.gro_complete, tcp6_gro_complete, |
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udp6_gro_complete, skb, nhoff); |
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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 int sit_gro_complete(struct sk_buff *skb, int nhoff) |
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{ |
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skb->encapsulation = 1; |
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skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; |
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return ipv6_gro_complete(skb, nhoff); |
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} |
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static int ip6ip6_gro_complete(struct sk_buff *skb, int nhoff) |
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{ |
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skb->encapsulation = 1; |
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skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6; |
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return ipv6_gro_complete(skb, nhoff); |
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} |
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static int ip4ip6_gro_complete(struct sk_buff *skb, int nhoff) |
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{ |
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skb->encapsulation = 1; |
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skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6; |
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return inet_gro_complete(skb, nhoff); |
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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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.callbacks = { |
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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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}; |
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static struct sk_buff *sit_gso_segment(struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) |
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return ERR_PTR(-EINVAL); |
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return ipv6_gso_segment(skb, features); |
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} |
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static struct sk_buff *ip4ip6_gso_segment(struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP6)) |
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return ERR_PTR(-EINVAL); |
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return inet_gso_segment(skb, features); |
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} |
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static struct sk_buff *ip6ip6_gso_segment(struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP6)) |
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return ERR_PTR(-EINVAL); |
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return ipv6_gso_segment(skb, features); |
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} |
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static const struct net_offload sit_offload = { |
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.callbacks = { |
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.gso_segment = sit_gso_segment, |
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.gro_receive = sit_ip6ip6_gro_receive, |
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.gro_complete = sit_gro_complete, |
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}, |
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}; |
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static const struct net_offload ip4ip6_offload = { |
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.callbacks = { |
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.gso_segment = ip4ip6_gso_segment, |
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.gro_receive = ip4ip6_gro_receive, |
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.gro_complete = ip4ip6_gro_complete, |
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}, |
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}; |
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static const struct net_offload ip6ip6_offload = { |
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.callbacks = { |
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.gso_segment = ip6ip6_gso_segment, |
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.gro_receive = sit_ip6ip6_gro_receive, |
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.gro_complete = ip6ip6_gro_complete, |
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}, |
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}; |
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static int __init ipv6_offload_init(void) |
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{ |
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if (tcpv6_offload_init() < 0) |
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pr_crit("%s: Cannot add TCP protocol offload\n", __func__); |
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if (ipv6_exthdrs_offload_init() < 0) |
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pr_crit("%s: Cannot add EXTHDRS protocol offload\n", __func__); |
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dev_add_offload(&ipv6_packet_offload); |
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inet_add_offload(&sit_offload, IPPROTO_IPV6); |
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inet6_add_offload(&ip6ip6_offload, IPPROTO_IPV6); |
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inet6_add_offload(&ip4ip6_offload, IPPROTO_IPIP); |
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return 0; |
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} |
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fs_initcall(ipv6_offload_init);
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