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1 | /* |
2 | * IPV6 GSO/GRO offload support | |
3 | * Linux INET implementation | |
4 | * | |
5 | * Copyright (C) 2016 secunet Security Networks AG | |
6 | * Author: Steffen Klassert <steffen.klassert@secunet.com> | |
7 | * | |
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. | |
11 | * | |
12 | * ESP GRO support | |
13 | */ | |
14 | ||
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> | |
22 | #include <net/ip.h> | |
23 | #include <net/xfrm.h> | |
24 | #include <net/esp.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> | |
30 | #include <net/ipv6.h> | |
31 | #include <linux/icmpv6.h> | |
32 | ||
33 | static struct sk_buff **esp6_gro_receive(struct sk_buff **head, | |
34 | struct sk_buff *skb) | |
35 | { | |
36 | int offset = skb_gro_offset(skb); | |
37 | struct xfrm_offload *xo; | |
38 | struct xfrm_state *x; | |
39 | __be32 seq; | |
40 | __be32 spi; | |
41 | int err; | |
42 | ||
43 | skb_pull(skb, offset); | |
44 | ||
45 | if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0) | |
46 | goto out; | |
47 | ||
48 | err = secpath_set(skb); | |
49 | if (err) | |
50 | goto out; | |
51 | ||
52 | if (skb->sp->len == XFRM_MAX_DEPTH) | |
53 | goto out; | |
54 | ||
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); | |
58 | if (!x) | |
59 | goto out; | |
60 | ||
61 | skb->sp->xvec[skb->sp->len++] = x; | |
62 | skb->sp->olen++; | |
63 | ||
64 | xo = xfrm_offload(skb); | |
65 | if (!xo) { | |
66 | xfrm_state_put(x); | |
67 | goto out; | |
68 | } | |
69 | xo->flags |= XFRM_GRO; | |
70 | ||
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; | |
75 | ||
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); | |
79 | ||
80 | return ERR_PTR(-EINPROGRESS); | |
81 | out: | |
82 | skb_push(skb, offset); | |
83 | NAPI_GRO_CB(skb)->same_flow = 0; | |
84 | NAPI_GRO_CB(skb)->flush = 1; | |
85 | ||
86 | return NULL; | |
87 | } | |
88 | ||
89 | static const struct net_offload esp6_offload = { | |
90 | .callbacks = { | |
91 | .gro_receive = esp6_gro_receive, | |
92 | }, | |
93 | }; | |
94 | ||
95 | static int __init esp6_offload_init(void) | |
96 | { | |
97 | return inet6_add_offload(&esp6_offload, IPPROTO_ESP); | |
98 | } | |
99 | ||
100 | static void __exit esp6_offload_exit(void) | |
101 | { | |
102 | inet6_del_offload(&esp6_offload, IPPROTO_ESP); | |
103 | } | |
104 | ||
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>"); |