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f1bd7d659e
Both esp4 and esp6 used to assume that the SKB payload is encrypted and therefore the inner_network and inner_transport offsets are not relevant. When doing crypto offload in the NIC, this is no longer the case and the NIC driver needs these offsets so it can do TX TCP checksum offloading. This patch sets the inner_network and inner_transport members of the SKB, as well as encapsulation, to reflect the actual positions of these headers, and removes them only once encryption is done on the payload. Signed-off-by: Ilan Tayari <ilant@mellanox.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
152 lines
4 KiB
C
152 lines
4 KiB
C
/*
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* xfrm6_mode_tunnel.c - Tunnel 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/gfp.h>
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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/dsfield.h>
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#include <net/dst.h>
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#include <net/inet_ecn.h>
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#include <net/ip6_route.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
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{
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struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
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if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
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IP6_ECN_set_ce(skb, inner_iph);
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}
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/* Add encapsulation header.
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*
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* The top IP header will be constructed per RFC 2401.
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*/
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static int xfrm6_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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struct ipv6hdr *top_iph;
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int dsfield;
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skb_set_inner_network_header(skb, skb_network_offset(skb));
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skb_set_inner_transport_header(skb, skb_transport_offset(skb));
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skb_set_network_header(skb, -x->props.header_len);
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skb->mac_header = skb->network_header +
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offsetof(struct ipv6hdr, nexthdr);
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skb->transport_header = skb->network_header + sizeof(*top_iph);
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top_iph = ipv6_hdr(skb);
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top_iph->version = 6;
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memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
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sizeof(top_iph->flow_lbl));
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top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
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if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
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dsfield = 0;
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else
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dsfield = XFRM_MODE_SKB_CB(skb)->tos;
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dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
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if (x->props.flags & XFRM_STATE_NOECN)
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dsfield &= ~INET_ECN_MASK;
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ipv6_change_dsfield(top_iph, 0, dsfield);
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top_iph->hop_limit = ip6_dst_hoplimit(dst->child);
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top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
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top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
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return 0;
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}
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#define for_each_input_rcu(head, handler) \
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for (handler = rcu_dereference(head); \
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handler != NULL; \
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handler = rcu_dereference(handler->next))
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static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err = -EINVAL;
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if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
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goto out;
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if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
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goto out;
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err = skb_unclone(skb, GFP_ATOMIC);
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if (err)
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goto out;
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if (x->props.flags & XFRM_STATE_DECAP_DSCP)
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ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
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ipipv6_hdr(skb));
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if (!(x->props.flags & XFRM_STATE_NOECN))
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ipip6_ecn_decapsulate(skb);
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skb_reset_network_header(skb);
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skb_mac_header_rebuild(skb);
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err = 0;
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out:
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return err;
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}
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static struct sk_buff *xfrm6_mode_tunnel_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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__skb_push(skb, skb->mac_len);
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return skb_mac_gso_segment(skb, features);
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}
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static void xfrm6_mode_tunnel_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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if (xo->flags & XFRM_GSO_SEGMENT) {
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skb->network_header = skb->network_header - x->props.header_len;
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skb->transport_header = skb->network_header + sizeof(struct ipv6hdr);
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}
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skb_reset_mac_len(skb);
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pskb_pull(skb, skb->mac_len + x->props.header_len);
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}
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static struct xfrm_mode xfrm6_tunnel_mode = {
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.input2 = xfrm6_mode_tunnel_input,
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.input = xfrm_prepare_input,
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.output2 = xfrm6_mode_tunnel_output,
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.output = xfrm6_prepare_output,
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.gso_segment = xfrm6_mode_tunnel_gso_segment,
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.xmit = xfrm6_mode_tunnel_xmit,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_TUNNEL,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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};
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static int __init xfrm6_mode_tunnel_init(void)
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{
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return xfrm_register_mode(&xfrm6_tunnel_mode, AF_INET6);
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}
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static void __exit xfrm6_mode_tunnel_exit(void)
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{
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int err;
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err = xfrm_unregister_mode(&xfrm6_tunnel_mode, AF_INET6);
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BUG_ON(err);
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}
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module_init(xfrm6_mode_tunnel_init);
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module_exit(xfrm6_mode_tunnel_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TUNNEL);
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