[dpdk-dev] [PATCH] examples/ipsec-secgw: fix corner case for spi value

[Akhil Goyal]

application is using index 0 of SA table as error,
with current value of IPSEC_SA_MAX_ENTRIES(128) it can
not support SA with spi = 128, as it uses sa_idx = 0
in the SA table.

With this patch, sa_idx = 0 can also be used.

PS: spi = 0 is an invalid SPI and application throws error
for it.

Fixes: d299106e8e31 ("examples/ipsec-secgw: add IPsec sample application")

Signed-off-by: Akhil Goyal <akhil.goyal at nxp.com>
---
 examples/ipsec-secgw/ipsec-secgw.c | 7 ++++---
 examples/ipsec-secgw/sa.c          | 2 ++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/examples/ipsec-secgw/ipsec-secgw.c b/examples/ipsec-secgw/ipsec-secgw.c
index d6f7b36..4d50e72 100644
--- a/examples/ipsec-secgw/ipsec-secgw.c
+++ b/examples/ipsec-secgw/ipsec-secgw.c
@@ -420,7 +420,8 @@ inbound_sp_sa(struct sp_ctx *sp, struct sa_ctx *sa, struct traffic_type *ip,
 		}
 
 		sa_idx = ip->res[i] & PROTECT_MASK;
-		if (sa_idx == 0 || !inbound_sa_check(sa, m, sa_idx)) {
+		if (sa_idx >= IPSEC_SA_MAX_ENTRIES ||
+				!inbound_sa_check(sa, m, sa_idx)) {
 			rte_pktmbuf_free(m);
 			continue;
 		}
@@ -485,9 +486,9 @@ outbound_sp(struct sp_ctx *sp, struct traffic_type *ip,
 	for (i = 0; i < ip->num; i++) {
 		m = ip->pkts[i];
 		sa_idx = ip->res[i] & PROTECT_MASK;
-		if ((ip->res[i] == 0) || (ip->res[i] & DISCARD))
+		if (ip->res[i] & DISCARD)
 			rte_pktmbuf_free(m);
-		else if (sa_idx != 0) {
+		else if (sa_idx < IPSEC_SA_MAX_ENTRIES) {
 			ipsec->res[ipsec->num] = sa_idx;
 			ipsec->pkts[ipsec->num++] = m;
 		} else /* BYPASS */
diff --git a/examples/ipsec-secgw/sa.c b/examples/ipsec-secgw/sa.c
index 1ae4e2a..25ceea1 100644
--- a/examples/ipsec-secgw/sa.c
+++ b/examples/ipsec-secgw/sa.c
@@ -240,6 +240,8 @@ parse_sa_tokens(char **tokens, uint32_t n_tokens,
 	APP_CHECK_TOKEN_IS_NUM(tokens, 1, status);
 	if (status->status < 0)
 		return;
+	if (atoi(tokens[1]) == INVALID_SPI)
+		return;
 	rule->spi = atoi(tokens[1]);
 
 	for (ti = 2; ti < n_tokens; ti++) {
-- 
2.9.3