projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 7785bba2 SK |
1 | /* |
| 2 | * IPV4 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/udp.h> | |
| 30 | ||
| 31 | static struct sk_buff **esp4_gro_receive(struct sk_buff **head, | |
| 32 | struct sk_buff *skb) | |
| 33 | { | |
| 34 | int offset = skb_gro_offset(skb); | |
| 35 | struct xfrm_offload *xo; | |
| 36 | struct xfrm_state *x; | |
| 37 | __be32 seq; | |
| 38 | __be32 spi; | |
| 39 | int err; | |
| 40 | ||
| 41 | skb_pull(skb, offset); | |
| 42 | ||
| 43 | if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0) | |
| 44 | goto out; | |
| 45 | ||
| 46 | err = secpath_set(skb); | |
| 47 | if (err) | |
| 48 | goto out; | |
| 49 | ||
| 50 | if (skb->sp->len == XFRM_MAX_DEPTH) | |
| 51 | goto out; | |
| 52 | ||
| 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); | |
| 56 | if (!x) | |
| 57 | goto out; | |
| 58 | ||
| 59 | skb->sp->xvec[skb->sp->len++] = x; | |
| 60 | skb->sp->olen++; | |
| 61 | ||
| 62 | xo = xfrm_offload(skb); | |
| 63 | if (!xo) { | |
| 64 | xfrm_state_put(x); | |
| 65 | goto out; | |
| 66 | } | |
| 67 | xo->flags |= XFRM_GRO; | |
| 68 | ||
| 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; | |
| 73 | ||
| 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); | |
| 77 | ||
| 78 | return ERR_PTR(-EINPROGRESS); | |
| 79 | out: | |
| 80 | skb_push(skb, offset); | |
| 81 | NAPI_GRO_CB(skb)->same_flow = 0; | |
| 82 | NAPI_GRO_CB(skb)->flush = 1; | |
| 83 | ||
| 84 | return NULL; | |
| 85 | } | |
| 86 | ||
| 87 | static const struct net_offload esp4_offload = { | |
| 88 | .callbacks = { | |
| 89 | .gro_receive = esp4_gro_receive, | |
| 90 | }, | |
| 91 | }; | |
| 92 | ||
| 93 | static int __init esp4_offload_init(void) | |
| 94 | { | |
| 95 | return inet_add_offload(&esp4_offload, IPPROTO_ESP); | |
| 96 | } | |
| 97 | ||
| 98 | static void __exit esp4_offload_exit(void) | |
| 99 | { | |
| 100 | inet_del_offload(&esp4_offload, IPPROTO_ESP); | |
| 101 | } | |
| 102 | ||
| 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>"); |