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[NETLINK] Routing attribute related shortcuts

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RTA_GET_U(32|64)(tlv)
   Assumes TLV is a u32/u64 field and returns its value.

 RTA_GET_[M]SECS(tlv)
   Assumes TLV is a u64 and transports jiffies converted
   to seconds or milliseconds and returns its value.

 RTA_PUT_U(32|64)(skb, type, value)
   Appends %value as fixed u32/u64 to %skb as TLV %type.

 RTA_PUT_[M]SECS(skb, type, jiffies)
   Converts %jiffies to secs/msecs and appends it as u64
   to %skb as TLV %type.

 RTA_PUT_STRING(skb, type, string)
   Appends %NUL terminated %string to %skb as TLV %type.

 RTA_NEST(skb, type)
   Starts a nested TLV %type and returns the nesting handle.

 RTA_NEST_END(skb, nesting_handle)
   Finishes the nested TLV %nesting_handle, must be called
   symmetric to RTA_NEST(). Returns skb->len

 RTA_NEST_CANCEL(skb, nesting_handle)
   Cancel the nested TLV %nesting_handle and trim nested TLV
   from skb again, returns -1.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2005-06-18 22:50:38 -07:00 committed by David S. Miller
parent f88a10d656
commit 0076824492
1 changed files with 45 additions and 0 deletions
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45
include/linux/rtnetlink.h
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@ -790,6 +790,51 @@ extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const voi
goto rtattr_failure; \
memcpy(skb_put(skb, RTA_ALIGN(attrlen)), data, attrlen); })
#define RTA_PUT_U32(skb, attrtype, value) \
({ u32 _tmp = (value); \
RTA_PUT(skb, attrtype, sizeof(u32), &_tmp); })
#define RTA_PUT_U64(skb, attrtype, value) \
({ u64 _tmp = (value); \
RTA_PUT(skb, attrtype, sizeof(u64), &_tmp); })
#define RTA_PUT_SECS(skb, attrtype, value) \
RTA_PUT_U64(skb, attrtype, (value) / HZ)
#define RTA_PUT_MSECS(skb, attrtype, value) \
RTA_PUT_U64(skb, attrtype, jiffies_to_msecs(value))
#define RTA_PUT_STRING(skb, attrtype, value) \
RTA_PUT(skb, attrtype, strlen(value) + 1, value)
#define RTA_NEST(skb, type) \
({ struct rtattr *__start = (struct rtattr *) (skb)->tail; \
RTA_PUT(skb, type, 0, NULL); \
__start; })
#define RTA_NEST_END(skb, start) \
({ (start)->rta_len = ((skb)->tail - (unsigned char *) (start)); \
(skb)->len; })
#define RTA_NEST_CANCEL(skb, start) \
({ skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
-1; })
#define RTA_GET_U32(rta) \
({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u32)) \
goto rtattr_failure; \
*(u32 *) RTA_DATA(rta); })
#define RTA_GET_U64(rta) \
({ u64 _tmp; \
if (!rta || RTA_PAYLOAD(rta) < sizeof(u64)) \
goto rtattr_failure; \
memcpy(&_tmp, RTA_DATA(rta), sizeof(_tmp)); \
_tmp; })
#define RTA_GET_SECS(rta) ((unsigned long) RTA_GET_U64(rta) * HZ)
#define RTA_GET_MSECS(rta) (msecs_to_jiffies((unsigned long) RTA_GET_U64(rta)))
static inline struct rtattr *
__rta_reserve(struct sk_buff *skb, int attrtype, int attrlen)
{