bfc0698beb
A policy may have been set up with multiple transforms (e.g., ESP
and ipcomp). In this situation, the ingress IPsec processing
iterates in xfrm_input() and applies each transform in turn,
processing the nexthdr to find any additional xfrm that may apply.
This patch resets the transport header back to network header
only after the last transformation so that subsequent xfrms
can find the correct transport header.
Fixes: 7785bba299 ("esp: Add a software GRO codepath")
Suggested-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/*
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* xfrm6_mode_transport.c - Transport mode encapsulation for IPv6.
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*
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* Copyright (C) 2002 USAGI/WIDE Project
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* Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/stringify.h>
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#include <net/dst.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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#include <net/protocol.h>
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/* Add encapsulation header.
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*
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* The IP header and mutable extension headers will be moved forward to make
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* space for the encapsulation header.
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*/
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static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *iph;
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u8 *prevhdr;
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int hdr_len;
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iph = ipv6_hdr(skb);
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skb_set_inner_transport_header(skb, skb_transport_offset(skb));
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hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
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if (hdr_len < 0)
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return hdr_len;
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skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
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skb_set_network_header(skb, -x->props.header_len);
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skb->transport_header = skb->network_header + hdr_len;
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__skb_pull(skb, hdr_len);
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memmove(ipv6_hdr(skb), iph, hdr_len);
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return 0;
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}
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/* Remove encapsulation header.
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*
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* The IP header will be moved over the top of the encapsulation header.
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*
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* On entry, skb->h shall point to where the IP header should be and skb->nh
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* shall be set to where the IP header currently is. skb->data shall point
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* to the start of the payload.
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*/
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static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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int ihl = skb->data - skb_transport_header(skb);
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if (skb->transport_header != skb->network_header) {
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memmove(skb_transport_header(skb),
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skb_network_header(skb), ihl);
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skb->network_header = skb->transport_header;
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}
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ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
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sizeof(struct ipv6hdr));
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skb_reset_transport_header(skb);
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return 0;
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}
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static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
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struct sk_buff *skb,
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netdev_features_t features)
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{
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const struct net_offload *ops;
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct xfrm_offload *xo = xfrm_offload(skb);
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skb->transport_header += x->props.header_len;
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ops = rcu_dereference(inet6_offloads[xo->proto]);
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if (likely(ops && ops->callbacks.gso_segment))
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segs = ops->callbacks.gso_segment(skb, features);
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return segs;
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}
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static void xfrm6_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct xfrm_offload *xo = xfrm_offload(skb);
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skb_reset_mac_len(skb);
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pskb_pull(skb, skb->mac_len + sizeof(struct ipv6hdr) + x->props.header_len);
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if (xo->flags & XFRM_GSO_SEGMENT) {
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skb_reset_transport_header(skb);
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skb->transport_header -= x->props.header_len;
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}
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}
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static struct xfrm_mode xfrm6_transport_mode = {
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.input = xfrm6_transport_input,
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.output = xfrm6_transport_output,
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.gso_segment = xfrm4_transport_gso_segment,
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.xmit = xfrm6_transport_xmit,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_TRANSPORT,
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};
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static int __init xfrm6_transport_init(void)
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{
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return xfrm_register_mode(&xfrm6_transport_mode, AF_INET6);
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}
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static void __exit xfrm6_transport_exit(void)
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{
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int err;
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err = xfrm_unregister_mode(&xfrm6_transport_mode, AF_INET6);
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BUG_ON(err);
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}
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module_init(xfrm6_transport_init);
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module_exit(xfrm6_transport_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TRANSPORT);
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