[dpdk-dev] [PATCH v3] ipsec: include high order bytes of esn in pkt len

Lukasz Bartosik lbartosik at marvell.com
Wed Jun 5 17:31:27 CEST 2019


When esn is used then high-order 32 bits are included in ICV
calculation however are not transmitted. Update packet length
to be consistent with auth data offset and length before crypto
operation. High-order 32 bits of esn will be removed from packet
length in crypto post processing.

Signed-off-by: Lukasz Bartosik <lbartosik at marvell.com>
---
 lib/librte_ipsec/esp_inb.c  | 59 +++++++++++++++++++++++++++++++++++----------
 lib/librte_ipsec/esp_outb.c | 36 +++++++++++++++------------
 lib/librte_ipsec/sa.c       |  4 +--
 lib/librte_ipsec/sa.h       |  8 ++++++
 4 files changed, 76 insertions(+), 31 deletions(-)

diff --git a/lib/librte_ipsec/esp_inb.c b/lib/librte_ipsec/esp_inb.c
index 4e0e12a..23e4945 100644
--- a/lib/librte_ipsec/esp_inb.c
+++ b/lib/librte_ipsec/esp_inb.c
@@ -16,7 +16,8 @@
 #include "pad.h"
 
 typedef uint16_t (*esp_inb_process_t)(const struct rte_ipsec_sa *sa,
-	struct rte_mbuf *mb[], uint32_t sqn[], uint32_t dr[], uint16_t num);
+	struct rte_mbuf *mb[], uint32_t sqn[], uint32_t dr[], uint16_t num,
+	uint8_t sqh_len);
 
 /*
  * helper function to fill crypto_sym op for cipher+auth algorithms.
@@ -181,6 +182,15 @@ inb_pkt_prepare(const struct rte_ipsec_sa *sa, const struct replay_sqn *rsn,
 	icv->va = rte_pktmbuf_mtod_offset(ml, void *, icv_ofs);
 	icv->pa = rte_pktmbuf_iova_offset(ml, icv_ofs);
 
+	/*
+	 * if esn is used then high-order 32 bits are also used in ICV
+	 * calculation but are not transmitted, update packet length
+	 * to be consistent with auth data length and offset, this will
+	 * be subtracted from packet length in post crypto processing
+	 */
+	mb->pkt_len += sa->sqh_len;
+	ml->data_len += sa->sqh_len;
+
 	inb_pkt_xprepare(sa, sqn, icv);
 	return plen;
 }
@@ -373,14 +383,18 @@ tun_process_step3(struct rte_mbuf *mb, uint64_t txof_msk, uint64_t txof_val)
  */
 static inline uint16_t
 tun_process(const struct rte_ipsec_sa *sa, struct rte_mbuf *mb[],
-	uint32_t sqn[], uint32_t dr[], uint16_t num)
+	uint32_t sqn[], uint32_t dr[], uint16_t num, uint8_t sqh_len)
 {
 	uint32_t adj, i, k, tl;
 	uint32_t hl[num];
 	struct esp_tail espt[num];
 	struct rte_mbuf *ml[num];
 
-	const uint32_t tlen = sa->icv_len + sizeof(espt[0]);
+	/*
+	 * remove icv, esp trailer and high-order
+	 * 32 bits of esn from packet length
+	 */
+	const uint32_t tlen = sa->icv_len + sizeof(espt[0]) + sqh_len;
 	const uint32_t cofs = sa->ctp.cipher.offset;
 
 	/*
@@ -420,7 +434,7 @@ tun_process(const struct rte_ipsec_sa *sa, struct rte_mbuf *mb[],
  */
 static inline uint16_t
 trs_process(const struct rte_ipsec_sa *sa, struct rte_mbuf *mb[],
-	uint32_t sqn[], uint32_t dr[], uint16_t num)
+	uint32_t sqn[], uint32_t dr[], uint16_t num, uint8_t sqh_len)
 {
 	char *np;
 	uint32_t i, k, l2, tl;
@@ -428,7 +442,11 @@ trs_process(const struct rte_ipsec_sa *sa, struct rte_mbuf *mb[],
 	struct esp_tail espt[num];
 	struct rte_mbuf *ml[num];
 
-	const uint32_t tlen = sa->icv_len + sizeof(espt[0]);
+	/*
+	 * remove icv, esp trailer and high-order
+	 * 32 bits of esn from packet length
+	 */
+	const uint32_t tlen = sa->icv_len + sizeof(espt[0]) + sqh_len;
 	const uint32_t cofs = sa->ctp.cipher.offset;
 
 	/*
@@ -496,18 +514,15 @@ esp_inb_rsn_update(struct rte_ipsec_sa *sa, const uint32_t sqn[],
  * process group of ESP inbound packets.
  */
 static inline uint16_t
-esp_inb_pkt_process(const struct rte_ipsec_session *ss,
-	struct rte_mbuf *mb[], uint16_t num, esp_inb_process_t process)
+esp_inb_pkt_process(struct rte_ipsec_sa *sa, struct rte_mbuf *mb[],
+	uint16_t num, uint8_t sqh_len, esp_inb_process_t process)
 {
 	uint32_t k, n;
-	struct rte_ipsec_sa *sa;
 	uint32_t sqn[num];
 	uint32_t dr[num];
 
-	sa = ss->sa;
-
 	/* process packets, extract seq numbers */
-	k = process(sa, mb, sqn, dr, num);
+	k = process(sa, mb, sqn, dr, num, sqh_len);
 
 	/* handle unprocessed mbufs */
 	if (k != num && k != 0)
@@ -533,7 +548,16 @@ uint16_t
 esp_inb_tun_pkt_process(const struct rte_ipsec_session *ss,
 	struct rte_mbuf *mb[], uint16_t num)
 {
-	return esp_inb_pkt_process(ss, mb, num, tun_process);
+	struct rte_ipsec_sa *sa = ss->sa;
+
+	return esp_inb_pkt_process(sa, mb, num, sa->sqh_len, tun_process);
+}
+
+uint16_t
+inline_inb_tun_pkt_process(const struct rte_ipsec_session *ss,
+	struct rte_mbuf *mb[], uint16_t num)
+{
+	return esp_inb_pkt_process(ss->sa, mb, num, 0, tun_process);
 }
 
 /*
@@ -543,5 +567,14 @@ uint16_t
 esp_inb_trs_pkt_process(const struct rte_ipsec_session *ss,
 	struct rte_mbuf *mb[], uint16_t num)
 {
-	return esp_inb_pkt_process(ss, mb, num, trs_process);
+	struct rte_ipsec_sa *sa = ss->sa;
+
+	return esp_inb_pkt_process(sa, mb, num, sa->sqh_len, trs_process);
+}
+
+uint16_t
+inline_inb_trs_pkt_process(const struct rte_ipsec_session *ss,
+	struct rte_mbuf *mb[], uint16_t num)
+{
+	return esp_inb_pkt_process(ss->sa, mb, num, 0, trs_process);
 }
diff --git a/lib/librte_ipsec/esp_outb.c b/lib/librte_ipsec/esp_outb.c
index c798bc4..71bc3a6 100644
--- a/lib/librte_ipsec/esp_outb.c
+++ b/lib/librte_ipsec/esp_outb.c
@@ -104,7 +104,7 @@ outb_cop_prepare(struct rte_crypto_op *cop,
 static inline int32_t
 outb_tun_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 	const uint64_t ivp[IPSEC_MAX_IV_QWORD], struct rte_mbuf *mb,
-	union sym_op_data *icv)
+	union sym_op_data *icv, uint8_t sqh_len)
 {
 	uint32_t clen, hlen, l2len, pdlen, pdofs, plen, tlen;
 	struct rte_mbuf *ml;
@@ -126,11 +126,11 @@ outb_tun_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 
 	/* pad length + esp tail */
 	pdlen = clen - plen;
-	tlen = pdlen + sa->icv_len;
+	tlen = pdlen + sa->icv_len + sqh_len;
 
 	/* do append and prepend */
 	ml = rte_pktmbuf_lastseg(mb);
-	if (tlen + sa->sqh_len + sa->aad_len > rte_pktmbuf_tailroom(ml))
+	if (tlen + sa->aad_len > rte_pktmbuf_tailroom(ml))
 		return -ENOSPC;
 
 	/* prepend header */
@@ -152,8 +152,8 @@ outb_tun_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 	rte_memcpy(ph, sa->hdr, sa->hdr_len);
 
 	/* update original and new ip header fields */
-	update_tun_l3hdr(sa, ph + sa->hdr_l3_off, mb->pkt_len, sa->hdr_l3_off,
-			sqn_low16(sqc));
+	update_tun_l3hdr(sa, ph + sa->hdr_l3_off, mb->pkt_len - sqh_len,
+			sa->hdr_l3_off, sqn_low16(sqc));
 
 	/* update spi, seqn and iv */
 	esph = (struct esp_hdr *)(ph + sa->hdr_len);
@@ -242,8 +242,8 @@ esp_outb_tun_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
 		gen_iv(iv, sqc);
 
 		/* try to update the packet itself */
-		rc = outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv);
-
+		rc = outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv,
+					  sa->sqh_len);
 		/* success, setup crypto op */
 		if (rc >= 0) {
 			outb_pkt_xprepare(sa, sqc, &icv);
@@ -270,7 +270,8 @@ esp_outb_tun_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
 static inline int32_t
 outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 	const uint64_t ivp[IPSEC_MAX_IV_QWORD], struct rte_mbuf *mb,
-	uint32_t l2len, uint32_t l3len, union sym_op_data *icv)
+	uint32_t l2len, uint32_t l3len, union sym_op_data *icv,
+	uint8_t sqh_len)
 {
 	uint8_t np;
 	uint32_t clen, hlen, pdlen, pdofs, plen, tlen, uhlen;
@@ -292,11 +293,11 @@ outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 
 	/* pad length + esp tail */
 	pdlen = clen - plen;
-	tlen = pdlen + sa->icv_len;
+	tlen = pdlen + sa->icv_len + sqh_len;
 
 	/* do append and insert */
 	ml = rte_pktmbuf_lastseg(mb);
-	if (tlen + sa->sqh_len + sa->aad_len > rte_pktmbuf_tailroom(ml))
+	if (tlen + sa->aad_len > rte_pktmbuf_tailroom(ml))
 		return -ENOSPC;
 
 	/* prepend space for ESP header */
@@ -314,8 +315,8 @@ outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 	insert_esph(ph, ph + hlen, uhlen);
 
 	/* update ip  header fields */
-	np = update_trs_l3hdr(sa, ph + l2len, mb->pkt_len, l2len, l3len,
-			IPPROTO_ESP);
+	np = update_trs_l3hdr(sa, ph + l2len, mb->pkt_len - sqh_len, l2len,
+			l3len, IPPROTO_ESP);
 
 	/* update spi, seqn and iv */
 	esph = (struct esp_hdr *)(ph + uhlen);
@@ -380,8 +381,8 @@ esp_outb_trs_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
 		gen_iv(iv, sqc);
 
 		/* try to update the packet itself */
-		rc = outb_trs_pkt_prepare(sa, sqc, iv, mb[i], l2, l3, &icv);
-
+		rc = outb_trs_pkt_prepare(sa, sqc, iv, mb[i], l2, l3, &icv,
+					  sa->sqh_len);
 		/* success, setup crypto op */
 		if (rc >= 0) {
 			outb_pkt_xprepare(sa, sqc, &icv);
@@ -425,6 +426,9 @@ esp_outb_sqh_process(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
 	for (i = 0; i != num; i++) {
 		if ((mb[i]->ol_flags & PKT_RX_SEC_OFFLOAD_FAILED) == 0) {
 			ml = rte_pktmbuf_lastseg(mb[i]);
+			/* remove high-order 32 bits of esn from packet len */
+			mb[i]->pkt_len -= sa->sqh_len;
+			ml->data_len -= sa->sqh_len;
 			icv = rte_pktmbuf_mtod_offset(ml, void *,
 				ml->data_len - icv_len);
 			remove_sqh(icv, icv_len);
@@ -494,7 +498,7 @@ inline_outb_tun_pkt_process(const struct rte_ipsec_session *ss,
 		gen_iv(iv, sqc);
 
 		/* try to update the packet itself */
-		rc = outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv);
+		rc = outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv, 0);
 
 		k += (rc >= 0);
 
@@ -548,7 +552,7 @@ inline_outb_trs_pkt_process(const struct rte_ipsec_session *ss,
 
 		/* try to update the packet itself */
 		rc = outb_trs_pkt_prepare(sa, sqc, iv, mb[i],
-				l2, l3, &icv);
+				l2, l3, &icv, 0);
 
 		k += (rc >= 0);
 
diff --git a/lib/librte_ipsec/sa.c b/lib/librte_ipsec/sa.c
index 846e317..ff01358 100644
--- a/lib/librte_ipsec/sa.c
+++ b/lib/librte_ipsec/sa.c
@@ -610,10 +610,10 @@ inline_crypto_pkt_func_select(const struct rte_ipsec_sa *sa,
 	switch (sa->type & msk) {
 	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TUNLV4):
 	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TUNLV6):
-		pf->process = esp_inb_tun_pkt_process;
+		pf->process = inline_inb_tun_pkt_process;
 		break;
 	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TRANS):
-		pf->process = esp_inb_trs_pkt_process;
+		pf->process = inline_inb_trs_pkt_process;
 		break;
 	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV4):
 	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV6):
diff --git a/lib/librte_ipsec/sa.h b/lib/librte_ipsec/sa.h
index ffb5fb4..20c0a65 100644
--- a/lib/librte_ipsec/sa.h
+++ b/lib/librte_ipsec/sa.h
@@ -143,9 +143,17 @@ esp_inb_tun_pkt_process(const struct rte_ipsec_session *ss,
 	struct rte_mbuf *mb[], uint16_t num);
 
 uint16_t
+inline_inb_tun_pkt_process(const struct rte_ipsec_session *ss,
+	struct rte_mbuf *mb[], uint16_t num);
+
+uint16_t
 esp_inb_trs_pkt_process(const struct rte_ipsec_session *ss,
 	struct rte_mbuf *mb[], uint16_t num);
 
+uint16_t
+inline_inb_trs_pkt_process(const struct rte_ipsec_session *ss,
+	struct rte_mbuf *mb[], uint16_t num);
+
 /* outbound processing */
 
 uint16_t
-- 
2.7.4



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