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ila: add checksum neutral ILA translations

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Support checksum neutral ILA as described in the ILA draft. The low
order 16 bits of the identifier are used to contain the checksum
adjustment value.

The csum-mode parameter is added to described checksum processing. There
are three values:
 - adjust transport checksum (previous behavior)
 - do checksum neutral mapping
 - do nothing

On output the csum-mode in the ila_params is checked and acted on. If
mode is checksum neutral mapping then to mapping and set C-bit.

On input, C-bit is checked. If it is set checksum-netural mapping is
done (regardless of csum-mode in ila params) and C-bit will be cleared.
If it is not set then action in csum-mode is taken.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2016-04-23 11:46:57 -07:00
committed by David S. Miller
parent 642c2c9558
commit 90bfe662db
5 changed files with 112 additions and 15 deletions
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16
net/ipv6/ila/ila.h
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@@ -36,11 +36,13 @@ struct ila_identifier {
union {
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
u8 __space:5;
u8 __space:4;
u8 csum_neutral:1;
u8 type:3;
#elif defined(__BIG_ENDIAN_BITFIELD)
u8 type:3;
u8 __space:5;
u8 csum_neutral:1;
u8 __space:4;
#else
#error "Adjust your <asm/byteorder.h> defines"
#endif
@@ -64,6 +66,8 @@ enum {
ILA_ATYPE_RSVD_3,
};
#define CSUM_NEUTRAL_FLAG htonl(0x10000000)
struct ila_addr {
union {
struct in6_addr addr;
@@ -88,6 +92,7 @@ struct ila_params {
struct ila_locator locator;
struct ila_locator locator_match;
__wsum csum_diff;
u8 csum_mode;
};
static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
@@ -99,8 +104,15 @@ static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
return csum_partial(diff, sizeof(diff), 0);
}
static inline bool ila_csum_neutral_set(struct ila_identifier ident)
{
return !!(ident.csum_neutral);
}
void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p);
void ila_init_saved_csum(struct ila_params *p);
int ila_lwt_init(void);
void ila_lwt_fini(void);
int ila_xlat_init(void);