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authorThomas Graf <tgraf@suug.ch>2005-06-19 01:50:38 -0400
committerDavid S. Miller <davem@davemloft.net>2005-06-19 01:50:38 -0400
commit00768244923f66801958a8d2d103f7b65608c9b6 (patch)
tree8d4ec56bd4edd9e3bb47938d01ef809d60a83aa3 /include
parentf88a10d65620d97b6d0a7e352a3493c1b7e7409b (diff)
[NETLINK] Routing attribute related shortcuts
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/rtnetlink.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 91ac97c20777..a09b5d42babf 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -789,6 +789,51 @@ extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const voi
789({ if (unlikely(skb_tailroom(skb) < (int)(attrlen))) \ 789({ if (unlikely(skb_tailroom(skb) < (int)(attrlen))) \
790 goto rtattr_failure; \ 790 goto rtattr_failure; \
791 memcpy(skb_put(skb, RTA_ALIGN(attrlen)), data, attrlen); }) 791 memcpy(skb_put(skb, RTA_ALIGN(attrlen)), data, attrlen); })
792
793#define RTA_PUT_U32(skb, attrtype, value) \
794({ u32 _tmp = (value); \
795 RTA_PUT(skb, attrtype, sizeof(u32), &_tmp); })
796
797#define RTA_PUT_U64(skb, attrtype, value) \
798({ u64 _tmp = (value); \
799 RTA_PUT(skb, attrtype, sizeof(u64), &_tmp); })
800
801#define RTA_PUT_SECS(skb, attrtype, value) \
802 RTA_PUT_U64(skb, attrtype, (value) / HZ)
803
804#define RTA_PUT_MSECS(skb, attrtype, value) \
805 RTA_PUT_U64(skb, attrtype, jiffies_to_msecs(value))
806
807#define RTA_PUT_STRING(skb, attrtype, value) \
808 RTA_PUT(skb, attrtype, strlen(value) + 1, value)
809
810#define RTA_NEST(skb, type) \
811({ struct rtattr *__start = (struct rtattr *) (skb)->tail; \
812 RTA_PUT(skb, type, 0, NULL); \
813 __start; })
814
815#define RTA_NEST_END(skb, start) \
816({ (start)->rta_len = ((skb)->tail - (unsigned char *) (start)); \
817 (skb)->len; })
818
819#define RTA_NEST_CANCEL(skb, start) \
820({ skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
821 -1; })
822
823#define RTA_GET_U32(rta) \
824({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u32)) \
825 goto rtattr_failure; \
826 *(u32 *) RTA_DATA(rta); })
827
828#define RTA_GET_U64(rta) \
829({ u64 _tmp; \
830 if (!rta || RTA_PAYLOAD(rta) < sizeof(u64)) \
831 goto rtattr_failure; \
832 memcpy(&_tmp, RTA_DATA(rta), sizeof(_tmp)); \
833 _tmp; })
834
835#define RTA_GET_SECS(rta) ((unsigned long) RTA_GET_U64(rta) * HZ)
836#define RTA_GET_MSECS(rta) (msecs_to_jiffies((unsigned long) RTA_GET_U64(rta)))
792 837
793static inline struct rtattr * 838static inline struct rtattr *
794__rta_reserve(struct sk_buff *skb, int attrtype, int attrlen) 839__rta_reserve(struct sk_buff *skb, int attrtype, int attrlen)