mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 23:46:41 +07:00
c1aa8347e7
Define a private flag for remote checksun offload as well as a length for the option. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
#ifndef __NET_GUE_H
|
|
#define __NET_GUE_H
|
|
|
|
/* Definitions for the GUE header, standard and private flags, lengths
|
|
* of optional fields are below.
|
|
*
|
|
* Diagram of GUE header:
|
|
*
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* |Ver|C| Hlen | Proto/ctype | Standard flags |P|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | |
|
|
* ~ Fields (optional) ~
|
|
* | |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Private flags (optional, P bit is set) |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | |
|
|
* ~ Private fields (optional) ~
|
|
* | |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*
|
|
* C bit indicates contol message when set, data message when unset.
|
|
* For a control message, proto/ctype is interpreted as a type of
|
|
* control message. For data messages, proto/ctype is the IP protocol
|
|
* of the next header.
|
|
*
|
|
* P bit indicates private flags field is present. The private flags
|
|
* may refer to options placed after this field.
|
|
*/
|
|
|
|
struct guehdr {
|
|
union {
|
|
struct {
|
|
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
|
__u8 hlen:5,
|
|
control:1,
|
|
version:2;
|
|
#elif defined (__BIG_ENDIAN_BITFIELD)
|
|
__u8 version:2,
|
|
control:1,
|
|
hlen:5;
|
|
#else
|
|
#error "Please fix <asm/byteorder.h>"
|
|
#endif
|
|
__u8 proto_ctype;
|
|
__u16 flags;
|
|
};
|
|
__u32 word;
|
|
};
|
|
};
|
|
|
|
/* Standard flags in GUE header */
|
|
|
|
#define GUE_FLAG_PRIV htons(1<<0) /* Private flags are in options */
|
|
#define GUE_LEN_PRIV 4
|
|
|
|
#define GUE_FLAGS_ALL (GUE_FLAG_PRIV)
|
|
|
|
/* Private flags in the private option extension */
|
|
|
|
#define GUE_PFLAG_REMCSUM htonl(1 << 31)
|
|
#define GUE_PLEN_REMCSUM 4
|
|
|
|
#define GUE_PFLAGS_ALL (GUE_PFLAG_REMCSUM)
|
|
|
|
/* Functions to compute options length corresponding to flags.
|
|
* If we ever have a lot of flags this can be potentially be
|
|
* converted to a more optimized algorithm (table lookup
|
|
* for instance).
|
|
*/
|
|
static inline size_t guehdr_flags_len(__be16 flags)
|
|
{
|
|
return ((flags & GUE_FLAG_PRIV) ? GUE_LEN_PRIV : 0);
|
|
}
|
|
|
|
static inline size_t guehdr_priv_flags_len(__be32 flags)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* Validate standard and private flags. Returns non-zero (meaning invalid)
|
|
* if there is an unknown standard or private flags, or the options length for
|
|
* the flags exceeds the options length specific in hlen of the GUE header.
|
|
*/
|
|
static inline int validate_gue_flags(struct guehdr *guehdr,
|
|
size_t optlen)
|
|
{
|
|
size_t len;
|
|
__be32 flags = guehdr->flags;
|
|
|
|
if (flags & ~GUE_FLAGS_ALL)
|
|
return 1;
|
|
|
|
len = guehdr_flags_len(flags);
|
|
if (len > optlen)
|
|
return 1;
|
|
|
|
if (flags & GUE_FLAG_PRIV) {
|
|
/* Private flags are last four bytes accounted in
|
|
* guehdr_flags_len
|
|
*/
|
|
flags = *(__be32 *)((void *)&guehdr[1] + len - GUE_LEN_PRIV);
|
|
|
|
if (flags & ~GUE_PFLAGS_ALL)
|
|
return 1;
|
|
|
|
len += guehdr_priv_flags_len(flags);
|
|
if (len > optlen)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|