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>"); 109