2 * IPV4 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>
31 static struct sk_buff **esp4_gro_receive(struct sk_buff **head,
34 int offset = skb_gro_offset(skb);
35 struct xfrm_offload *xo;
41 skb_pull(skb, offset);
43 if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
46 err = secpath_set(skb);
50 if (skb->sp->len == XFRM_MAX_DEPTH)
53 x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
54 (xfrm_address_t *)&ip_hdr(skb)->daddr,
55 spi, IPPROTO_ESP, AF_INET);
59 skb->sp->xvec[skb->sp->len++] = x;
62 xo = xfrm_offload(skb);
67 xo->flags |= XFRM_GRO;
69 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
70 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
71 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
72 XFRM_SPI_SKB_CB(skb)->seq = seq;
74 /* We don't need to handle errors from xfrm_input, it does all
75 * the error handling and frees the resources on error. */
76 xfrm_input(skb, IPPROTO_ESP, spi, -2);
78 return ERR_PTR(-EINPROGRESS);
80 skb_push(skb, offset);
81 NAPI_GRO_CB(skb)->same_flow = 0;
82 NAPI_GRO_CB(skb)->flush = 1;
87 static const struct net_offload esp4_offload = {
89 .gro_receive = esp4_gro_receive,
93 static int __init esp4_offload_init(void)
95 return inet_add_offload(&esp4_offload, IPPROTO_ESP);
98 static void __exit esp4_offload_exit(void)
100 inet_del_offload(&esp4_offload, IPPROTO_ESP);
103 module_init(esp4_offload_init);
104 module_exit(esp4_offload_exit);
105 MODULE_LICENSE("GPL");
106 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");