2 * IPV6 GSO/GRO offload support
3 * Linux INET implementation
5 * Copyright (C) 2016 secunet Security Networks AG
6 * Author: Steffen Klassert <steffen.klassert@secunet.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
15 #include <linux/skbuff.h>
16 #include <linux/init.h>
17 #include <net/protocol.h>
18 #include <crypto/aead.h>
19 #include <crypto/authenc.h>
20 #include <linux/err.h>
21 #include <linux/module.h>
25 #include <linux/scatterlist.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29 #include <net/ip6_route.h>
31 #include <linux/icmpv6.h>
33 static struct sk_buff **esp6_gro_receive(struct sk_buff **head,
36 int offset = skb_gro_offset(skb);
37 struct xfrm_offload *xo;
43 skb_pull(skb, offset);
45 if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
48 err = secpath_set(skb);
52 if (skb->sp->len == XFRM_MAX_DEPTH)
55 x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
56 (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
57 spi, IPPROTO_ESP, AF_INET6);
61 skb->sp->xvec[skb->sp->len++] = x;
64 xo = xfrm_offload(skb);
69 xo->flags |= XFRM_GRO;
71 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
72 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
73 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
74 XFRM_SPI_SKB_CB(skb)->seq = seq;
76 /* We don't need to handle errors from xfrm_input, it does all
77 * the error handling and frees the resources on error. */
78 xfrm_input(skb, IPPROTO_ESP, spi, -2);
80 return ERR_PTR(-EINPROGRESS);
82 skb_push(skb, offset);
83 NAPI_GRO_CB(skb)->same_flow = 0;
84 NAPI_GRO_CB(skb)->flush = 1;
89 static const struct net_offload esp6_offload = {
91 .gro_receive = esp6_gro_receive,
95 static int __init esp6_offload_init(void)
97 return inet6_add_offload(&esp6_offload, IPPROTO_ESP);
100 static void __exit esp6_offload_exit(void)
102 inet6_del_offload(&esp6_offload, IPPROTO_ESP);
105 module_init(esp6_offload_init);
106 module_exit(esp6_offload_exit);
107 MODULE_LICENSE("GPL");
108 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");