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net: create skb_gso_validate_mac_len()

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commit 2b16f048729bf35e6c28a40cbfad07239f9dcd90 upstream.

If you take a GSO skb, and split it into packets, will the MAC
length (L2 + L3 + L4 headers + payload) of those packets be small
enough to fit within a given length?

Move skb_gso_mac_seglen() to skbuff.h with other related functions
like skb_gso_network_seglen() so we can use it, and then create
skb_gso_validate_mac_len to do the full calculation.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 4.4: There is no GSO_BY_FRAGS case to handle, so
 skb_gso_validate_mac_len() becomes a trivial comparison. Put it inline in
 <linux/skbuff.h>.]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Axtens 2018-01-31 14:15:33 +11:00 • committed by Greg Kroah-Hartman
parent c53c1a821d
commit a33b6d4c8b
2 changed files with 30 additions and 10 deletions
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30
include/linux/skbuff.h
View file

@ -3664,5 +3664,35 @@ static inline unsigned int skb_gso_network_seglen(const struct sk_buff *skb)
return hdr_len + skb_gso_transport_seglen(skb);
}
/**
* skb_gso_mac_seglen - Return length of individual segments of a gso packet
*
* @skb: GSO skb
*
* skb_gso_mac_seglen is used to determine the real size of the
* individual segments, including MAC/L2, Layer3 (IP, IPv6) and L4
* headers (TCP/UDP).
*/
static inline unsigned int skb_gso_mac_seglen(const struct sk_buff *skb)
{
unsigned int hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
return hdr_len + skb_gso_transport_seglen(skb);
}
/**
* skb_gso_validate_mac_len - Will a split GSO skb fit in a given length?
*
* @skb: GSO skb
* @len: length to validate against
*
* skb_gso_validate_mac_len validates if a given skb will fit a wanted
* length once split, including L2, L3 and L4 headers and the payload.
*/
static inline bool
skb_gso_validate_mac_len(const struct sk_buff *skb, unsigned int len)
{
return skb_gso_mac_seglen(skb) <= len;
}
#endif /* __KERNEL__ */
#endif /* _LINUX_SKBUFF_H */

10
net/sched/sch_tbf.c
View file

@ -142,16 +142,6 @@ static u64 psched_ns_t2l(const struct psched_ratecfg *r,
return len;
}
/*
* Return length of individual segments of a gso packet,
* including all headers (MAC, IP, TCP/UDP)
*/
static unsigned int skb_gso_mac_seglen(const struct sk_buff *skb)
{
unsigned int hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
return hdr_len + skb_gso_transport_seglen(skb);
}
/* GSO packet is too big, segment it so that tbf can transmit
* each segment in time
*/