Re: [dpdk-dev] [PATCH v4 4/9] examples/ipsec-secgw: fix outbound codepath for single SA

[Akhil Goyal <akhil.goyal@nxp.com>]

On 12/14/2018 10:10 PM, Konstantin Ananyev wrote:
> Looking at process_pkts_outbound_nosp() there seems few issues:
> - accessing mbuf after it was freed
> - invoking ipsec_outbound() for ipv4 packets only
> - copying number of packets, but not the mbuf pointers itself
>
> that patch provides fixes for that issues.
>
> Fixes: 906257e965b7 ("examples/ipsec-secgw: support IPv6")
>
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> Acked-by: Radu Nicolau <radu.nicolau@intel.com>
> ---
>   examples/ipsec-secgw/ipsec-secgw.c | 32 ++++++++++++++++++++----------
>   1 file changed, 22 insertions(+), 10 deletions(-)
>
> diff --git a/examples/ipsec-secgw/ipsec-secgw.c b/examples/ipsec-secgw/ipsec-secgw.c
> index 62443172a..d1da2d5ce 100644
> --- a/examples/ipsec-secgw/ipsec-secgw.c
> +++ b/examples/ipsec-secgw/ipsec-secgw.c
> @@ -616,32 +616,44 @@ process_pkts_outbound_nosp(struct ipsec_ctx *ipsec_ctx,
>   		struct ipsec_traffic *traffic)
>   {
>   	struct rte_mbuf *m;
> -	uint32_t nb_pkts_out, i;
> +	uint32_t nb_pkts_out, i, n;
>   	struct ip *ip;
>   
>   	/* Drop any IPsec traffic from protected ports */
>   	for (i = 0; i < traffic->ipsec.num; i++)
>   		rte_pktmbuf_free(traffic->ipsec.pkts[i]);
>   
> -	traffic->ipsec.num = 0;
> +	n = 0;
>   
> -	for (i = 0; i < traffic->ip4.num; i++)
> -		traffic->ip4.res[i] = single_sa_idx;
> +	for (i = 0; i < traffic->ip4.num; i++) {
> +		traffic->ipsec.pkts[n] = traffic->ip4.pkts[i];
> +		traffic->ipsec.res[n++] = single_sa_idx;
> +	}
>   
> -	for (i = 0; i < traffic->ip6.num; i++)
> -		traffic->ip6.res[i] = single_sa_idx;
> +	for (i = 0; i < traffic->ip6.num; i++) {
> +		traffic->ipsec.pkts[n] = traffic->ip6.pkts[i];
> +		traffic->ipsec.res[n++] = single_sa_idx;
> +	}
> +
> +	traffic->ip4.num = 0;
> +	traffic->ip6.num = 0;
> +	traffic->ipsec.num = n;
>   
> -	nb_pkts_out = ipsec_outbound(ipsec_ctx, traffic->ip4.pkts,
> -			traffic->ip4.res, traffic->ip4.num,
> +	nb_pkts_out = ipsec_outbound(ipsec_ctx, traffic->ipsec.pkts,
> +			traffic->ipsec.res, traffic->ipsec.num,
>   			MAX_PKT_BURST);
>   
>   	/* They all sue the same SA (ip4 or ip6 tunnel) */
>   	m = traffic->ipsec.pkts[i];
>   	ip = rte_pktmbuf_mtod(m, struct ip *);
> -	if (ip->ip_v == IPVERSION)
> +	if (ip->ip_v == IPVERSION) {
>   		traffic->ip4.num = nb_pkts_out;
> -	else
> +		for (i = 0; i < nb_pkts_out; i++)
> +			traffic->ip4.pkts[i] = traffic->ipsec.pkts[i];
> +	} else {
>   		traffic->ip6.num = nb_pkts_out;
> +		traffic->ip6.pkts[i] = traffic->ipsec.pkts[i];
you don't need a for loop here??
> +	}
>   }
>   
>   static inline int32_t