diff mbox series

[v7,4/8] ipsec: add support for NAT-T

Message ID 20211001095017.3342431-5-radu.nicolau@intel.com (mailing list archive)
State Superseded, archived
Delegated to: akhil goyal
Headers
Series new features for ipsec and security libraries |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Radu Nicolau Oct. 1, 2021, 9:50 a.m. UTC 
  Add support for the IPsec NAT-Traversal use case for Tunnel mode
packets.

Signed-off-by: Declan Doherty <declan.doherty@intel.com>
Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
Signed-off-by: Abhijit Sinha <abhijit.sinha@intel.com>
Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>
---
 lib/ipsec/esp_outb.c     |  9 +++++++++
 lib/ipsec/rte_ipsec_sa.h |  9 ++++++++-
 lib/ipsec/sa.c           | 28 +++++++++++++++++++++++++---
 3 files changed, 42 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/lib/ipsec/esp_outb.c b/lib/ipsec/esp_outb.c
index a3f77469c3..0e3314b358 100644
--- a/lib/ipsec/esp_outb.c
+++ b/lib/ipsec/esp_outb.c
@@ -5,6 +5,7 @@ 
 #include <rte_ipsec.h>
 #include <rte_esp.h>
 #include <rte_ip.h>
+#include <rte_udp.h>
 #include <rte_errno.h>
 #include <rte_cryptodev.h>
 
@@ -185,6 +186,14 @@  outb_tun_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 	/* copy tunnel pkt header */
 	rte_memcpy(ph, sa->hdr, sa->hdr_len);
 
+	/* if UDP encap is enabled update the dgram_len */
+	if (sa->type & RTE_IPSEC_SATP_NATT_ENABLE) {
+		struct rte_udp_hdr *udph = (struct rte_udp_hdr *)
+				(ph - sizeof(struct rte_udp_hdr));
+		udph->dgram_len = rte_cpu_to_be_16(mb->pkt_len - sqh_len -
+				sa->hdr_l3_off - sa->hdr_len);
+	}
+
 	/* update original and new ip header fields */
 	update_tun_outb_l3hdr(sa, ph + sa->hdr_l3_off, ph + hlen,
 			mb->pkt_len - sqh_len, sa->hdr_l3_off, sqn_low16(sqc));
diff --git a/lib/ipsec/rte_ipsec_sa.h b/lib/ipsec/rte_ipsec_sa.h
index cf51ad8338..3a22705055 100644
--- a/lib/ipsec/rte_ipsec_sa.h
+++ b/lib/ipsec/rte_ipsec_sa.h
@@ -78,6 +78,7 @@  struct rte_ipsec_sa_prm {
  * - for TUNNEL outer IP version (IPv4/IPv6)
  * - are SA SQN operations 'atomic'
  * - ESN enabled/disabled
+ * - NAT-T UDP encapsulated (TUNNEL mode only)
  * ...
  */
 
@@ -89,7 +90,8 @@  enum {
 	RTE_SATP_LOG2_SQN = RTE_SATP_LOG2_MODE + 2,
 	RTE_SATP_LOG2_ESN,
 	RTE_SATP_LOG2_ECN,
-	RTE_SATP_LOG2_DSCP
+	RTE_SATP_LOG2_DSCP,
+	RTE_SATP_LOG2_NATT
 };
 
 #define RTE_IPSEC_SATP_IPV_MASK		(1ULL << RTE_SATP_LOG2_IPV)
@@ -125,6 +127,11 @@  enum {
 #define RTE_IPSEC_SATP_DSCP_DISABLE	(0ULL << RTE_SATP_LOG2_DSCP)
 #define RTE_IPSEC_SATP_DSCP_ENABLE	(1ULL << RTE_SATP_LOG2_DSCP)
 
+#define RTE_IPSEC_SATP_NATT_MASK	(1ULL << RTE_SATP_LOG2_NATT)
+#define RTE_IPSEC_SATP_NATT_DISABLE	(0ULL << RTE_SATP_LOG2_NATT)
+#define RTE_IPSEC_SATP_NATT_ENABLE	(1ULL << RTE_SATP_LOG2_NATT)
+
+
 /**
  * get type of given SA
  * @return
diff --git a/lib/ipsec/sa.c b/lib/ipsec/sa.c
index 720e0f365b..1dd19467a6 100644
--- a/lib/ipsec/sa.c
+++ b/lib/ipsec/sa.c
@@ -5,6 +5,7 @@ 
 #include <rte_ipsec.h>
 #include <rte_esp.h>
 #include <rte_ip.h>
+#include <rte_udp.h>
 #include <rte_errno.h>
 #include <rte_cryptodev.h>
 
@@ -217,6 +218,10 @@  fill_sa_type(const struct rte_ipsec_sa_prm *prm, uint64_t *type)
 	} else
 		return -EINVAL;
 
+	/* check for UDP encapsulation flag */
+	if (prm->ipsec_xform.options.udp_encap == 1)
+		tp |= RTE_IPSEC_SATP_NATT_ENABLE;
+
 	/* check for ESN flag */
 	if (prm->ipsec_xform.options.esn == 0)
 		tp |= RTE_IPSEC_SATP_ESN_DISABLE;
@@ -355,12 +360,22 @@  esp_outb_tun_init(struct rte_ipsec_sa *sa, const struct rte_ipsec_sa_prm *prm)
 	sa->hdr_len = prm->tun.hdr_len;
 	sa->hdr_l3_off = prm->tun.hdr_l3_off;
 
+	memcpy(sa->hdr, prm->tun.hdr, prm->tun.hdr_len);
+
+	/* insert UDP header if UDP encapsulation is inabled */
+	if (sa->type & RTE_IPSEC_SATP_NATT_ENABLE) {
+		struct rte_udp_hdr *udph = (struct rte_udp_hdr *)
+				&sa->hdr[prm->tun.hdr_len];
+		sa->hdr_len += sizeof(struct rte_udp_hdr);
+		udph->src_port = prm->ipsec_xform.udp.sport;
+		udph->dst_port = prm->ipsec_xform.udp.dport;
+		udph->dgram_cksum = 0;
+	}
+
 	/* update l2_len and l3_len fields for outbound mbuf */
 	sa->tx_offload.val = rte_mbuf_tx_offload(sa->hdr_l3_off,
 		sa->hdr_len - sa->hdr_l3_off, 0, 0, 0, 0, 0);
 
-	memcpy(sa->hdr, prm->tun.hdr, sa->hdr_len);
-
 	esp_outb_init(sa, sa->hdr_len);
 }
 
@@ -372,7 +387,8 @@  esp_sa_init(struct rte_ipsec_sa *sa, const struct rte_ipsec_sa_prm *prm,
 	const struct crypto_xform *cxf)
 {
 	static const uint64_t msk = RTE_IPSEC_SATP_DIR_MASK |
-				RTE_IPSEC_SATP_MODE_MASK;
+				RTE_IPSEC_SATP_MODE_MASK |
+				RTE_IPSEC_SATP_NATT_MASK;
 
 	if (prm->ipsec_xform.options.ecn)
 		sa->tos_mask |= RTE_IPV4_HDR_ECN_MASK;
@@ -475,10 +491,16 @@  esp_sa_init(struct rte_ipsec_sa *sa, const struct rte_ipsec_sa_prm *prm,
 	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TRANS):
 		esp_inb_init(sa);
 		break;
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV4 |
+			RTE_IPSEC_SATP_NATT_ENABLE):
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV6 |
+			RTE_IPSEC_SATP_NATT_ENABLE):
 	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV4):
 	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV6):
 		esp_outb_tun_init(sa, prm);
 		break;
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TRANS |
+			RTE_IPSEC_SATP_NATT_ENABLE):
 	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TRANS):
 		esp_outb_init(sa, 0);
 		break;