mirror of
https://github.com/torvalds/linux.git
synced 2024-12-14 23:25:54 +00:00
efa1a65c7e
This patch is to add csum offload support for gre header:
On the TX path in gre_build_header(), when CHECKSUM_PARTIAL's set
for inner proto, it will calculate the csum for outer proto, and
inner csum will be offloaded later. Otherwise, CHECKSUM_PARTIAL
and csum_start/offset will be set for outer proto, and the outer
csum will be offloaded later.
On the GSO path in gre_gso_segment(), when CHECKSUM_PARTIAL is
not set for inner proto and the hardware supports csum offload,
CHECKSUM_PARTIAL and csum_start/offset will be set for outer
proto, and outer csum will be offloaded later. Otherwise, it
will do csum for outer proto by calling gso_make_checksum().
Note that SCTP has to do the csum by itself for non GSO path in
sctp_packet_pack(), as gre_build_header() can't handle the csum
with CHECKSUM_PARTIAL set for SCTP CRC csum offload.
v1->v2:
- remove the SCTP part, as GRE dev doesn't support SCTP CRC CSUM
and it will always do checksum for SCTP in sctp_packet_pack()
when it's not a GSO packet.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
150 lines
3.3 KiB
C
150 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_GRE_H
|
|
#define __LINUX_GRE_H
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <net/ip_tunnels.h>
|
|
|
|
struct gre_base_hdr {
|
|
__be16 flags;
|
|
__be16 protocol;
|
|
} __packed;
|
|
|
|
struct gre_full_hdr {
|
|
struct gre_base_hdr fixed_header;
|
|
__be16 csum;
|
|
__be16 reserved1;
|
|
__be32 key;
|
|
__be32 seq;
|
|
} __packed;
|
|
#define GRE_HEADER_SECTION 4
|
|
|
|
#define GREPROTO_CISCO 0
|
|
#define GREPROTO_PPTP 1
|
|
#define GREPROTO_MAX 2
|
|
#define GRE_IP_PROTO_MAX 2
|
|
|
|
struct gre_protocol {
|
|
int (*handler)(struct sk_buff *skb);
|
|
void (*err_handler)(struct sk_buff *skb, u32 info);
|
|
};
|
|
|
|
int gre_add_protocol(const struct gre_protocol *proto, u8 version);
|
|
int gre_del_protocol(const struct gre_protocol *proto, u8 version);
|
|
|
|
struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
|
|
u8 name_assign_type);
|
|
int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
|
|
bool *csum_err, __be16 proto, int nhs);
|
|
|
|
static inline bool netif_is_gretap(const struct net_device *dev)
|
|
{
|
|
return dev->rtnl_link_ops &&
|
|
!strcmp(dev->rtnl_link_ops->kind, "gretap");
|
|
}
|
|
|
|
static inline bool netif_is_ip6gretap(const struct net_device *dev)
|
|
{
|
|
return dev->rtnl_link_ops &&
|
|
!strcmp(dev->rtnl_link_ops->kind, "ip6gretap");
|
|
}
|
|
|
|
static inline int gre_calc_hlen(__be16 o_flags)
|
|
{
|
|
int addend = 4;
|
|
|
|
if (o_flags & TUNNEL_CSUM)
|
|
addend += 4;
|
|
if (o_flags & TUNNEL_KEY)
|
|
addend += 4;
|
|
if (o_flags & TUNNEL_SEQ)
|
|
addend += 4;
|
|
return addend;
|
|
}
|
|
|
|
static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
|
|
{
|
|
__be16 tflags = 0;
|
|
|
|
if (flags & GRE_CSUM)
|
|
tflags |= TUNNEL_CSUM;
|
|
if (flags & GRE_ROUTING)
|
|
tflags |= TUNNEL_ROUTING;
|
|
if (flags & GRE_KEY)
|
|
tflags |= TUNNEL_KEY;
|
|
if (flags & GRE_SEQ)
|
|
tflags |= TUNNEL_SEQ;
|
|
if (flags & GRE_STRICT)
|
|
tflags |= TUNNEL_STRICT;
|
|
if (flags & GRE_REC)
|
|
tflags |= TUNNEL_REC;
|
|
if (flags & GRE_VERSION)
|
|
tflags |= TUNNEL_VERSION;
|
|
|
|
return tflags;
|
|
}
|
|
|
|
static inline __be16 gre_tnl_flags_to_gre_flags(__be16 tflags)
|
|
{
|
|
__be16 flags = 0;
|
|
|
|
if (tflags & TUNNEL_CSUM)
|
|
flags |= GRE_CSUM;
|
|
if (tflags & TUNNEL_ROUTING)
|
|
flags |= GRE_ROUTING;
|
|
if (tflags & TUNNEL_KEY)
|
|
flags |= GRE_KEY;
|
|
if (tflags & TUNNEL_SEQ)
|
|
flags |= GRE_SEQ;
|
|
if (tflags & TUNNEL_STRICT)
|
|
flags |= GRE_STRICT;
|
|
if (tflags & TUNNEL_REC)
|
|
flags |= GRE_REC;
|
|
if (tflags & TUNNEL_VERSION)
|
|
flags |= GRE_VERSION;
|
|
|
|
return flags;
|
|
}
|
|
|
|
static inline void gre_build_header(struct sk_buff *skb, int hdr_len,
|
|
__be16 flags, __be16 proto,
|
|
__be32 key, __be32 seq)
|
|
{
|
|
struct gre_base_hdr *greh;
|
|
|
|
skb_push(skb, hdr_len);
|
|
|
|
skb_set_inner_protocol(skb, proto);
|
|
skb_reset_transport_header(skb);
|
|
greh = (struct gre_base_hdr *)skb->data;
|
|
greh->flags = gre_tnl_flags_to_gre_flags(flags);
|
|
greh->protocol = proto;
|
|
|
|
if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) {
|
|
__be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
|
|
|
|
if (flags & TUNNEL_SEQ) {
|
|
*ptr = seq;
|
|
ptr--;
|
|
}
|
|
if (flags & TUNNEL_KEY) {
|
|
*ptr = key;
|
|
ptr--;
|
|
}
|
|
if (flags & TUNNEL_CSUM &&
|
|
!(skb_shinfo(skb)->gso_type &
|
|
(SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
|
|
*ptr = 0;
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
*(__sum16 *)ptr = csum_fold(lco_csum(skb));
|
|
} else {
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
skb->csum_start = skb_transport_header(skb) - skb->head;
|
|
skb->csum_offset = sizeof(*greh);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|