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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 <[email protected]>- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /* | ||
| * IPV4 GSO/GRO offload support | ||
| * Linux INET implementation | ||
| * | ||
| * Copyright (C) 2016 secunet Security Networks AG | ||
| * Author: Steffen Klassert <[email protected]> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify it | ||
| * under the terms and conditions of the GNU General Public License, | ||
| * version 2, as published by the Free Software Foundation. | ||
| * | ||
| * ESP GRO support | ||
| */ | ||
|
|
||
| #include <linux/skbuff.h> | ||
| #include <linux/init.h> | ||
| #include <net/protocol.h> | ||
| #include <crypto/aead.h> | ||
| #include <crypto/authenc.h> | ||
| #include <linux/err.h> | ||
| #include <linux/module.h> | ||
| #include <net/ip.h> | ||
| #include <net/xfrm.h> | ||
| #include <net/esp.h> | ||
| #include <linux/scatterlist.h> | ||
| #include <linux/kernel.h> | ||
| #include <linux/slab.h> | ||
| #include <linux/spinlock.h> | ||
| #include <net/udp.h> | ||
|
|
||
| static struct sk_buff **esp4_gro_receive(struct sk_buff **head, | ||
| struct sk_buff *skb) | ||
| { | ||
| int offset = skb_gro_offset(skb); | ||
| struct xfrm_offload *xo; | ||
| struct xfrm_state *x; | ||
| __be32 seq; | ||
| __be32 spi; | ||
| int err; | ||
|
|
||
| skb_pull(skb, offset); | ||
|
|
||
| if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0) | ||
| goto out; | ||
|
|
||
| err = secpath_set(skb); | ||
| if (err) | ||
| goto out; | ||
|
|
||
| if (skb->sp->len == XFRM_MAX_DEPTH) | ||
| goto out; | ||
|
|
||
| x = xfrm_state_lookup(dev_net(skb->dev), skb->mark, | ||
| (xfrm_address_t *)&ip_hdr(skb)->daddr, | ||
| spi, IPPROTO_ESP, AF_INET); | ||
| if (!x) | ||
| goto out; | ||
|
|
||
| skb->sp->xvec[skb->sp->len++] = x; | ||
| skb->sp->olen++; | ||
|
|
||
| xo = xfrm_offload(skb); | ||
| if (!xo) { | ||
| xfrm_state_put(x); | ||
| goto out; | ||
| } | ||
| xo->flags |= XFRM_GRO; | ||
|
|
||
| XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; | ||
| XFRM_SPI_SKB_CB(skb)->family = AF_INET; | ||
| XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); | ||
| XFRM_SPI_SKB_CB(skb)->seq = seq; | ||
|
|
||
| /* We don't need to handle errors from xfrm_input, it does all | ||
| * the error handling and frees the resources on error. */ | ||
| xfrm_input(skb, IPPROTO_ESP, spi, -2); | ||
|
|
||
| return ERR_PTR(-EINPROGRESS); | ||
| out: | ||
| skb_push(skb, offset); | ||
| NAPI_GRO_CB(skb)->same_flow = 0; | ||
| NAPI_GRO_CB(skb)->flush = 1; | ||
|
|
||
| return NULL; | ||
| } | ||
|
|
||
| static const struct net_offload esp4_offload = { | ||
| .callbacks = { | ||
| .gro_receive = esp4_gro_receive, | ||
| }, | ||
| }; | ||
|
|
||
| static int __init esp4_offload_init(void) | ||
| { | ||
| return inet_add_offload(&esp4_offload, IPPROTO_ESP); | ||
| } | ||
|
|
||
| static void __exit esp4_offload_exit(void) | ||
| { | ||
| inet_del_offload(&esp4_offload, IPPROTO_ESP); | ||
| } | ||
|
|
||
| module_init(esp4_offload_init); | ||
| module_exit(esp4_offload_exit); | ||
| MODULE_LICENSE("GPL"); | ||
| MODULE_AUTHOR("Steffen Klassert <[email protected]>"); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| /* | ||
| * IPV6 GSO/GRO offload support | ||
| * Linux INET implementation | ||
| * | ||
| * Copyright (C) 2016 secunet Security Networks AG | ||
| * Author: Steffen Klassert <[email protected]> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify it | ||
| * under the terms and conditions of the GNU General Public License, | ||
| * version 2, as published by the Free Software Foundation. | ||
| * | ||
| * ESP GRO support | ||
| */ | ||
|
|
||
| #include <linux/skbuff.h> | ||
| #include <linux/init.h> | ||
| #include <net/protocol.h> | ||
| #include <crypto/aead.h> | ||
| #include <crypto/authenc.h> | ||
| #include <linux/err.h> | ||
| #include <linux/module.h> | ||
| #include <net/ip.h> | ||
| #include <net/xfrm.h> | ||
| #include <net/esp.h> | ||
| #include <linux/scatterlist.h> | ||
| #include <linux/kernel.h> | ||
| #include <linux/slab.h> | ||
| #include <linux/spinlock.h> | ||
| #include <net/ip6_route.h> | ||
| #include <net/ipv6.h> | ||
| #include <linux/icmpv6.h> | ||
|
|
||
| static struct sk_buff **esp6_gro_receive(struct sk_buff **head, | ||
| struct sk_buff *skb) | ||
| { | ||
| int offset = skb_gro_offset(skb); | ||
| struct xfrm_offload *xo; | ||
| struct xfrm_state *x; | ||
| __be32 seq; | ||
| __be32 spi; | ||
| int err; | ||
|
|
||
| skb_pull(skb, offset); | ||
|
|
||
| if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0) | ||
| goto out; | ||
|
|
||
| err = secpath_set(skb); | ||
| if (err) | ||
| goto out; | ||
|
|
||
| if (skb->sp->len == XFRM_MAX_DEPTH) | ||
| goto out; | ||
|
|
||
| x = xfrm_state_lookup(dev_net(skb->dev), skb->mark, | ||
| (xfrm_address_t *)&ipv6_hdr(skb)->daddr, | ||
| spi, IPPROTO_ESP, AF_INET6); | ||
| if (!x) | ||
| goto out; | ||
|
|
||
| skb->sp->xvec[skb->sp->len++] = x; | ||
| skb->sp->olen++; | ||
|
|
||
| xo = xfrm_offload(skb); | ||
| if (!xo) { | ||
| xfrm_state_put(x); | ||
| goto out; | ||
| } | ||
| xo->flags |= XFRM_GRO; | ||
|
|
||
| XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; | ||
| XFRM_SPI_SKB_CB(skb)->family = AF_INET6; | ||
| XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); | ||
| XFRM_SPI_SKB_CB(skb)->seq = seq; | ||
|
|
||
| /* We don't need to handle errors from xfrm_input, it does all | ||
| * the error handling and frees the resources on error. */ | ||
| xfrm_input(skb, IPPROTO_ESP, spi, -2); | ||
|
|
||
| return ERR_PTR(-EINPROGRESS); | ||
| out: | ||
| skb_push(skb, offset); | ||
| NAPI_GRO_CB(skb)->same_flow = 0; | ||
| NAPI_GRO_CB(skb)->flush = 1; | ||
|
|
||
| return NULL; | ||
| } | ||
|
|
||
| static const struct net_offload esp6_offload = { | ||
| .callbacks = { | ||
| .gro_receive = esp6_gro_receive, | ||
| }, | ||
| }; | ||
|
|
||
| static int __init esp6_offload_init(void) | ||
| { | ||
| return inet6_add_offload(&esp6_offload, IPPROTO_ESP); | ||
| } | ||
|
|
||
| static void __exit esp6_offload_exit(void) | ||
| { | ||
| inet6_del_offload(&esp6_offload, IPPROTO_ESP); | ||
| } | ||
|
|
||
| module_init(esp6_offload_init); | ||
| module_exit(esp6_offload_exit); | ||
| MODULE_LICENSE("GPL"); | ||
| MODULE_AUTHOR("Steffen Klassert <[email protected]>"); |
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