[1/3] examples/ipsec-secgw: fix invalid packet length
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Commit Message
for packets smaller then 64B some NICs reports pkt_len=64B.
As ipsec-secgw (and librte_ipsec) relies on pkt_len value to determine
payload length, that causes problems for small packets.
To fix the issue, check that pkt_len matches values in IPv4/IPv6 header
and re-adjust pkt_len if necessary.
Fixes: 906257e965b7 ("examples/ipsec-secgw: support IPv6")
Fixes: d299106e8e31 ("examples/ipsec-secgw: add IPsec sample application")
Cc: stable@dpdk.org
Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
---
examples/ipsec-secgw/ipsec-secgw.c | 59 +++++++++++++++++++++++-------
1 file changed, 46 insertions(+), 13 deletions(-)
@@ -229,35 +229,68 @@ static struct rte_eth_conf port_conf = {
static struct socket_ctx socket_ctx[NB_SOCKETS];
+static inline void
+adjust_ipv4_pktlen(struct rte_mbuf *m, const struct ipv4_hdr *iph,
+ uint32_t l2_len)
+{
+ uint32_t plen, trim;
+
+ plen = rte_be_to_cpu_16(iph->total_length) + l2_len;
+ if (plen < m->pkt_len) {
+ trim = m->pkt_len - plen;
+ rte_pktmbuf_trim(m, trim);
+ }
+}
+
+static inline void
+adjust_ipv6_pktlen(struct rte_mbuf *m, const struct ipv6_hdr *iph,
+ uint32_t l2_len)
+{
+ uint32_t plen, trim;
+
+ plen = rte_be_to_cpu_16(iph->payload_len) + sizeof(*iph) + l2_len;
+ if (plen < m->pkt_len) {
+ trim = m->pkt_len - plen;
+ rte_pktmbuf_trim(m, trim);
+ }
+}
+
static inline void
prepare_one_packet(struct rte_mbuf *pkt, struct ipsec_traffic *t)
{
- uint8_t *nlp;
- struct ether_hdr *eth;
+ const struct ether_hdr *eth;
+ const struct ipv4_hdr *iph4;
+ const struct ipv6_hdr *iph6;
- eth = rte_pktmbuf_mtod(pkt, struct ether_hdr *);
+ eth = rte_pktmbuf_mtod(pkt, const struct ether_hdr *);
if (eth->ether_type == rte_cpu_to_be_16(ETHER_TYPE_IPv4)) {
- nlp = (uint8_t *)rte_pktmbuf_adj(pkt, ETHER_HDR_LEN);
- nlp = RTE_PTR_ADD(nlp, offsetof(struct ip, ip_p));
- if (*nlp == IPPROTO_ESP)
+
+ iph4 = (const struct ipv4_hdr *)rte_pktmbuf_adj(pkt,
+ ETHER_HDR_LEN);
+ adjust_ipv4_pktlen(pkt, iph4, 0);
+
+ if (iph4->next_proto_id == IPPROTO_ESP)
t->ipsec.pkts[(t->ipsec.num)++] = pkt;
else {
- t->ip4.data[t->ip4.num] = nlp;
+ t->ip4.data[t->ip4.num] = &iph4->next_proto_id;
t->ip4.pkts[(t->ip4.num)++] = pkt;
}
pkt->l2_len = 0;
- pkt->l3_len = sizeof(struct ip);
+ pkt->l3_len = sizeof(*iph4);
} else if (eth->ether_type == rte_cpu_to_be_16(ETHER_TYPE_IPv6)) {
- nlp = (uint8_t *)rte_pktmbuf_adj(pkt, ETHER_HDR_LEN);
- nlp = RTE_PTR_ADD(nlp, offsetof(struct ip6_hdr, ip6_nxt));
- if (*nlp == IPPROTO_ESP)
+
+ iph6 = (const struct ipv6_hdr *)rte_pktmbuf_adj(pkt,
+ ETHER_HDR_LEN);
+ adjust_ipv6_pktlen(pkt, iph6, 0);
+
+ if (iph6->proto == IPPROTO_ESP)
t->ipsec.pkts[(t->ipsec.num)++] = pkt;
else {
- t->ip6.data[t->ip6.num] = nlp;
+ t->ip6.data[t->ip6.num] = &iph6->proto;
t->ip6.pkts[(t->ip6.num)++] = pkt;
}
pkt->l2_len = 0;
- pkt->l3_len = sizeof(struct ip6_hdr);
+ pkt->l3_len = sizeof(*iph6);
} else {
/* Unknown/Unsupported type, drop the packet */
RTE_LOG(ERR, IPSEC, "Unsupported packet type 0x%x\n",