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7785bba299
This patch adds GRO ifrastructure and callbacks for ESP on
ipv4 and ipv6.
In case the GRO layer detects an ESP packet, the
esp{4,6}_gro_receive() function does a xfrm state lookup
and calls the xfrm input layer if it finds a matching state.
The packet will be decapsulated and reinjected it into layer 2.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
/*
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* IPV4 GSO/GRO offload support
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* Linux INET implementation
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*
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* Copyright (C) 2016 secunet Security Networks AG
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* Author: Steffen Klassert <steffen.klassert@secunet.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* ESP GRO support
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*/
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <net/protocol.h>
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#include <crypto/aead.h>
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#include <crypto/authenc.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <net/esp.h>
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#include <linux/scatterlist.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <net/udp.h>
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static struct sk_buff **esp4_gro_receive(struct sk_buff **head,
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struct sk_buff *skb)
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{
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int offset = skb_gro_offset(skb);
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struct xfrm_offload *xo;
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struct xfrm_state *x;
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__be32 seq;
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__be32 spi;
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int err;
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skb_pull(skb, offset);
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if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
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goto out;
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err = secpath_set(skb);
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if (err)
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goto out;
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if (skb->sp->len == XFRM_MAX_DEPTH)
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goto out;
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x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
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(xfrm_address_t *)&ip_hdr(skb)->daddr,
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spi, IPPROTO_ESP, AF_INET);
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if (!x)
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goto out;
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skb->sp->xvec[skb->sp->len++] = x;
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skb->sp->olen++;
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xo = xfrm_offload(skb);
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if (!xo) {
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xfrm_state_put(x);
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goto out;
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}
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xo->flags |= XFRM_GRO;
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XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
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XFRM_SPI_SKB_CB(skb)->family = AF_INET;
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XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
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XFRM_SPI_SKB_CB(skb)->seq = seq;
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/* We don't need to handle errors from xfrm_input, it does all
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* the error handling and frees the resources on error. */
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xfrm_input(skb, IPPROTO_ESP, spi, -2);
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return ERR_PTR(-EINPROGRESS);
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out:
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skb_push(skb, offset);
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NAPI_GRO_CB(skb)->same_flow = 0;
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NAPI_GRO_CB(skb)->flush = 1;
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return NULL;
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}
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static const struct net_offload esp4_offload = {
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.callbacks = {
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.gro_receive = esp4_gro_receive,
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},
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};
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static int __init esp4_offload_init(void)
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{
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return inet_add_offload(&esp4_offload, IPPROTO_ESP);
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}
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static void __exit esp4_offload_exit(void)
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{
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inet_del_offload(&esp4_offload, IPPROTO_ESP);
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}
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module_init(esp4_offload_init);
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module_exit(esp4_offload_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
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