[dpdk-dev] [PATCH v5 1/3] ip_frag: ensure minimum v4 fragmentation length

[Ananyev, Konstantin]

> Do a formal parameter check of mtu length, as well as
> checking the the various inputs for validity.  If any
> aren't acceptable, we bail.
> 
> Acked-by: Lukasz Wojciechowski <l.wojciechow at partner.samsung.com>
> Signed-off-by: Aaron Conole <aconole at redhat.com>
> ---
>  lib/librte_ip_frag/rte_ipv4_fragmentation.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/lib/librte_ip_frag/rte_ipv4_fragmentation.c b/lib/librte_ip_frag/rte_ipv4_fragmentation.c
> index 9e9f986cc5..c36678a6d2 100644
> --- a/lib/librte_ip_frag/rte_ipv4_fragmentation.c
> +++ b/lib/librte_ip_frag/rte_ipv4_fragmentation.c
> @@ -76,6 +76,15 @@ rte_ipv4_fragment_packet(struct rte_mbuf *pkt_in,
>  	uint16_t fragment_offset, flag_offset, frag_size;
>  	uint16_t frag_bytes_remaining;
> 
> +	/*
> +	 * Formal parameter checking.
> +	 */
> +	if (unlikely(pkt_in == NULL) || unlikely(pkts_out == NULL) ||
> +	    unlikely(nb_pkts_out == 0) ||
> +	    unlikely(pool_direct == NULL) || unlikely(pool_indirect == NULL) ||
> +	    unlikely(mtu_size < 68))

It is better not to use hard-coded constant values.
I think we have a macro for it at lib/librte_net/rte_ether.h:
#define RTE_ETHER_MIN_MTU 68 /**< Minimum MTU for IPv4 packets, see RFC 791. */

Apart from that:
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>


> +		return -EINVAL;
> +
>  	/*
>  	 * Ensure the IP payload length of all fragments is aligned to a
>  	 * multiple of 8 bytes as per RFC791 section 2.3.
> --
> 2.25.1