// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2018 Oracle and/or its affiliates. All rights reserved. */

#include "ixgbevf.h"
#include <net/xfrm.h>
#include <crypto/aead.h>

#define IXGBE_IPSEC_KEY_BITS  160
static const char aes_gcm_name[] = "rfc4106(gcm(aes))";

/**
 * ixgbevf_ipsec_set_pf_sa - ask the PF to set up an SA
 * @adapter: board private structure
 * @xs: xfrm info to be sent to the PF
 *
 * Returns: positive offload handle from the PF, or negative error code
 **/
static int ixgbevf_ipsec_set_pf_sa(struct ixgbevf_adapter *adapter,
                                   struct xfrm_state *xs)
{
        u32 msgbuf[IXGBE_VFMAILBOX_SIZE] = { 0 };
        struct ixgbe_hw *hw = &adapter->hw;
        struct sa_mbx_msg *sam;
        int ret;

        /* send the important bits to the PF */
        sam = (struct sa_mbx_msg *)(&msgbuf[1]);
        sam->flags = xs->xso.flags;
        sam->spi = xs->id.spi;
        sam->proto = xs->id.proto;
        sam->family = xs->props.family;

        if (xs->props.family == AF_INET6)
                memcpy(sam->addr, &xs->id.daddr.a6, sizeof(xs->id.daddr.a6));
        else
                memcpy(sam->addr, &xs->id.daddr.a4, sizeof(xs->id.daddr.a4));
        memcpy(sam->key, xs->aead->alg_key, sizeof(sam->key));

        msgbuf[0] = IXGBE_VF_IPSEC_ADD;

        spin_lock_bh(&adapter->mbx_lock);

        ret = hw->mbx.ops.write_posted(hw, msgbuf, IXGBE_VFMAILBOX_SIZE);
        if (ret)
                goto out;

        ret = hw->mbx.ops.read_posted(hw, msgbuf, 2);
        if (ret)
                goto out;

        ret = (int)msgbuf[1];
        if (msgbuf[0] & IXGBE_VT_MSGTYPE_NACK && ret >= 0)
                ret = -1;

out:
        spin_unlock_bh(&adapter->mbx_lock);

        return ret;
}

/**
 * ixgbevf_ipsec_del_pf_sa - ask the PF to delete an SA
 * @adapter: board private structure
 * @pfsa: sa index returned from PF when created, -1 for all
 *
 * Returns: 0 on success, or negative error code
 **/
static int ixgbevf_ipsec_del_pf_sa(struct ixgbevf_adapter *adapter, int pfsa)
{
        struct ixgbe_hw *hw = &adapter->hw;
        u32 msgbuf[2];
        int err;

        memset(msgbuf, 0, sizeof(msgbuf));
        msgbuf[0] = IXGBE_VF_IPSEC_DEL;
        msgbuf[1] = (u32)pfsa;

        spin_lock_bh(&adapter->mbx_lock);

        err = hw->mbx.ops.write_posted(hw, msgbuf, 2);
        if (err)
                goto out;

        err = hw->mbx.ops.read_posted(hw, msgbuf, 2);
        if (err)
                goto out;

out:
        spin_unlock_bh(&adapter->mbx_lock);
        return err;
}

/**
 * ixgbevf_ipsec_restore - restore the IPsec HW settings after a reset
 * @adapter: board private structure
 *
 * Reload the HW tables from the SW tables after they've been bashed
 * by a chip reset.  While we're here, make sure any stale VF data is
 * removed, since we go through reset when num_vfs changes.
 **/
void ixgbevf_ipsec_restore(struct ixgbevf_adapter *adapter)
{
        struct ixgbevf_ipsec *ipsec = adapter->ipsec;
        struct net_device *netdev = adapter->netdev;
        int i;

        if (!(adapter->netdev->features & NETIF_F_HW_ESP))
                return;

        /* reload the Rx and Tx keys */
        for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
                struct rx_sa *r = &ipsec->rx_tbl[i];
                struct tx_sa *t = &ipsec->tx_tbl[i];
                int ret;

                if (r->used) {
                        ret = ixgbevf_ipsec_set_pf_sa(adapter, r->xs);
                        if (ret < 0)
                                netdev_err(netdev, "reload rx_tbl[%d] failed = %d\n",
                                           i, ret);
                }

                if (t->used) {
                        ret = ixgbevf_ipsec_set_pf_sa(adapter, t->xs);
                        if (ret < 0)
                                netdev_err(netdev, "reload tx_tbl[%d] failed = %d\n",
                                           i, ret);
                }
        }
}

/**
 * ixgbevf_ipsec_find_empty_idx - find the first unused security parameter index
 * @ipsec: pointer to IPsec struct
 * @rxtable: true if we need to look in the Rx table
 *
 * Returns the first unused index in either the Rx or Tx SA table
 **/
static
int ixgbevf_ipsec_find_empty_idx(struct ixgbevf_ipsec *ipsec, bool rxtable)
{
        u32 i;

        if (rxtable) {
                if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
                        return -ENOSPC;

                /* search rx sa table */
                for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
                        if (!ipsec->rx_tbl[i].used)
                                return i;
                }
        } else {
                if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
                        return -ENOSPC;

                /* search tx sa table */
                for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
                        if (!ipsec->tx_tbl[i].used)
                                return i;
                }
        }

        return -ENOSPC;
}

/**
 * ixgbevf_ipsec_find_rx_state - find the state that matches
 * @ipsec: pointer to IPsec struct
 * @daddr: inbound address to match
 * @proto: protocol to match
 * @spi: SPI to match
 * @ip4: true if using an IPv4 address
 *
 * Returns a pointer to the matching SA state information
 **/
static
struct xfrm_state *ixgbevf_ipsec_find_rx_state(struct ixgbevf_ipsec *ipsec,
                                               __be32 *daddr, u8 proto,
                                               __be32 spi, bool ip4)
{
        struct xfrm_state *ret = NULL;
        struct rx_sa *rsa;

        rcu_read_lock();
        hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
                                   (__force u32)spi) {
                if (spi == rsa->xs->id.spi &&
                    ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
                      (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
                                       sizeof(rsa->xs->id.daddr.a6)))) &&
                    proto == rsa->xs->id.proto) {
                        ret = rsa->xs;
                        xfrm_state_hold(ret);
                        break;
                }
        }
        rcu_read_unlock();
        return ret;
}

/**
 * ixgbevf_ipsec_parse_proto_keys - find the key and salt based on the protocol
 * @xs: pointer to xfrm_state struct
 * @mykey: pointer to key array to populate
 * @mysalt: pointer to salt value to populate
 *
 * This copies the protocol keys and salt to our own data tables.  The
 * 82599 family only supports the one algorithm.
 **/
static int ixgbevf_ipsec_parse_proto_keys(struct xfrm_state *xs,
                                          u32 *mykey, u32 *mysalt)
{
        struct net_device *dev = xs->xso.dev;
        unsigned char *key_data;
        char *alg_name = NULL;
        int key_len;

        if (!xs->aead) {
                netdev_err(dev, "Unsupported IPsec algorithm\n");
                return -EINVAL;
        }

        if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
                netdev_err(dev, "IPsec offload requires %d bit authentication\n",
                           IXGBE_IPSEC_AUTH_BITS);
                return -EINVAL;
        }

        key_data = &xs->aead->alg_key[0];
        key_len = xs->aead->alg_key_len;
        alg_name = xs->aead->alg_name;

        if (strcmp(alg_name, aes_gcm_name)) {
                netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
                           aes_gcm_name);
                return -EINVAL;
        }

        /* The key bytes come down in a big endian array of bytes, so
         * we don't need to do any byte swapping.
         * 160 accounts for 16 byte key and 4 byte salt
         */
        if (key_len > IXGBE_IPSEC_KEY_BITS) {
                *mysalt = ((u32 *)key_data)[4];
        } else if (key_len == IXGBE_IPSEC_KEY_BITS) {
                *mysalt = 0;
        } else {
                netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
                return -EINVAL;
        }
        memcpy(mykey, key_data, 16);

        return 0;
}

/**
 * ixgbevf_ipsec_add_sa - program device with a security association
 * @xs: pointer to transformer state struct
 **/
static int ixgbevf_ipsec_add_sa(struct xfrm_state *xs)
{
        struct net_device *dev = xs->xso.dev;
        struct ixgbevf_adapter *adapter = netdev_priv(dev);
        struct ixgbevf_ipsec *ipsec = adapter->ipsec;
        u16 sa_idx;
        int ret;

        if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
                netdev_err(dev, "Unsupported protocol 0x%04x for IPsec offload\n",
                           xs->id.proto);
                return -EINVAL;
        }

        if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
                struct rx_sa rsa;

                if (xs->calg) {
                        netdev_err(dev, "Compression offload not supported\n");
                        return -EINVAL;
                }

                /* find the first unused index */
                ret = ixgbevf_ipsec_find_empty_idx(ipsec, true);
                if (ret < 0) {
                        netdev_err(dev, "No space for SA in Rx table!\n");
                        return ret;
                }
                sa_idx = (u16)ret;

                memset(&rsa, 0, sizeof(rsa));
                rsa.used = true;
                rsa.xs = xs;

                if (rsa.xs->id.proto & IPPROTO_ESP)
                        rsa.decrypt = xs->ealg || xs->aead;

                /* get the key and salt */
                ret = ixgbevf_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
                if (ret) {
                        netdev_err(dev, "Failed to get key data for Rx SA table\n");
                        return ret;
                }

                /* get ip for rx sa table */
                if (xs->props.family == AF_INET6)
                        memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
                else
                        memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);

                rsa.mode = IXGBE_RXMOD_VALID;
                if (rsa.xs->id.proto & IPPROTO_ESP)
                        rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
                if (rsa.decrypt)
                        rsa.mode |= IXGBE_RXMOD_DECRYPT;
                if (rsa.xs->props.family == AF_INET6)
                        rsa.mode |= IXGBE_RXMOD_IPV6;

                ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
                if (ret < 0)
                        return ret;
                rsa.pfsa = ret;

                /* the preparations worked, so save the info */
                memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));

                xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;

                ipsec->num_rx_sa++;

                /* hash the new entry for faster search in Rx path */
                hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
                             (__force u32)rsa.xs->id.spi);
        } else {
                struct tx_sa tsa;

                /* find the first unused index */
                ret = ixgbevf_ipsec_find_empty_idx(ipsec, false);
                if (ret < 0) {
                        netdev_err(dev, "No space for SA in Tx table\n");
                        return ret;
                }
                sa_idx = (u16)ret;

                memset(&tsa, 0, sizeof(tsa));
                tsa.used = true;
                tsa.xs = xs;

                if (xs->id.proto & IPPROTO_ESP)
                        tsa.encrypt = xs->ealg || xs->aead;

                ret = ixgbevf_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
                if (ret) {
                        netdev_err(dev, "Failed to get key data for Tx SA table\n");
                        memset(&tsa, 0, sizeof(tsa));
                        return ret;
                }

                ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
                if (ret < 0)
                        return ret;
                tsa.pfsa = ret;

                /* the preparations worked, so save the info */
                memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));

                xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;

                ipsec->num_tx_sa++;
        }

        return 0;
}

/**
 * ixgbevf_ipsec_del_sa - clear out this specific SA
 * @xs: pointer to transformer state struct
 **/
static void ixgbevf_ipsec_del_sa(struct xfrm_state *xs)
{
        struct net_device *dev = xs->xso.dev;
        struct ixgbevf_adapter *adapter = netdev_priv(dev);
        struct ixgbevf_ipsec *ipsec = adapter->ipsec;
        u16 sa_idx;

        if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
                sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;

                if (!ipsec->rx_tbl[sa_idx].used) {
                        netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
                                   sa_idx, xs->xso.offload_handle);
                        return;
                }

                ixgbevf_ipsec_del_pf_sa(adapter, ipsec->rx_tbl[sa_idx].pfsa);
                hash_del_rcu(&ipsec->rx_tbl[sa_idx].hlist);
                memset(&ipsec->rx_tbl[sa_idx], 0, sizeof(struct rx_sa));
                ipsec->num_rx_sa--;
        } else {
                sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;

                if (!ipsec->tx_tbl[sa_idx].used) {
                        netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
                                   sa_idx, xs->xso.offload_handle);
                        return;
                }

                ixgbevf_ipsec_del_pf_sa(adapter, ipsec->tx_tbl[sa_idx].pfsa);
                memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
                ipsec->num_tx_sa--;
        }
}

/**
 * ixgbevf_ipsec_offload_ok - can this packet use the xfrm hw offload
 * @skb: current data packet
 * @xs: pointer to transformer state struct
 **/
static bool ixgbevf_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
{
        if (xs->props.family == AF_INET) {
                /* Offload with IPv4 options is not supported yet */
                if (ip_hdr(skb)->ihl != 5)
                        return false;
        } else {
                /* Offload with IPv6 extension headers is not support yet */
                if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
                        return false;
        }

        return true;
}

static const struct xfrmdev_ops ixgbevf_xfrmdev_ops = {
        .xdo_dev_state_add = ixgbevf_ipsec_add_sa,
        .xdo_dev_state_delete = ixgbevf_ipsec_del_sa,
        .xdo_dev_offload_ok = ixgbevf_ipsec_offload_ok,
};

/**
 * ixgbevf_ipsec_tx - setup Tx flags for IPsec offload
 * @tx_ring: outgoing context
 * @first: current data packet
 * @itd: ipsec Tx data for later use in building context descriptor
 **/
int ixgbevf_ipsec_tx(struct ixgbevf_ring *tx_ring,
                     struct ixgbevf_tx_buffer *first,
                     struct ixgbevf_ipsec_tx_data *itd)
{
        struct ixgbevf_adapter *adapter = netdev_priv(tx_ring->netdev);
        struct ixgbevf_ipsec *ipsec = adapter->ipsec;
        struct xfrm_state *xs;
        struct sec_path *sp;
        struct tx_sa *tsa;
        u16 sa_idx;

        sp = skb_sec_path(first->skb);
        if (unlikely(!sp->len)) {
                netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
                           __func__, sp->len);
                return 0;
        }

        xs = xfrm_input_state(first->skb);
        if (unlikely(!xs)) {
                netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
                           __func__, xs);
                return 0;
        }

        sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
        if (unlikely(sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
                netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
                           __func__, sa_idx, xs->xso.offload_handle);
                return 0;
        }

        tsa = &ipsec->tx_tbl[sa_idx];
        if (unlikely(!tsa->used)) {
                netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
                           __func__, sa_idx);
                return 0;
        }

        itd->pfsa = tsa->pfsa - IXGBE_IPSEC_BASE_TX_INDEX;

        first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CSUM;

        if (xs->id.proto == IPPROTO_ESP) {
                itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
                              IXGBE_ADVTXD_TUCMD_L4T_TCP;
                if (first->protocol == htons(ETH_P_IP))
                        itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;

                /* The actual trailer length is authlen (16 bytes) plus
                 * 2 bytes for the proto and the padlen values, plus
                 * padlen bytes of padding.  This ends up not the same
                 * as the static value found in xs->props.trailer_len (21).
                 *
                 * ... but if we're doing GSO, don't bother as the stack
                 * doesn't add a trailer for those.
                 */
                if (!skb_is_gso(first->skb)) {
                        /* The "correct" way to get the auth length would be
                         * to use
                         *    authlen = crypto_aead_authsize(xs->data);
                         * but since we know we only have one size to worry
                         * about * we can let the compiler use the constant
                         * and save us a few CPU cycles.
                         */
                        const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
                        struct sk_buff *skb = first->skb;
                        u8 padlen;
                        int ret;

                        ret = skb_copy_bits(skb, skb->len - (authlen + 2),
                                            &padlen, 1);
                        if (unlikely(ret))
                                return 0;
                        itd->trailer_len = authlen + 2 + padlen;
                }
        }
        if (tsa->encrypt)
                itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;

        return 1;
}

/**
 * ixgbevf_ipsec_rx - decode IPsec bits from Rx descriptor
 * @rx_ring: receiving ring
 * @rx_desc: receive data descriptor
 * @skb: current data packet
 *
 * Determine if there was an IPsec encapsulation noticed, and if so set up
 * the resulting status for later in the receive stack.
 **/
void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
                      union ixgbe_adv_rx_desc *rx_desc,
                      struct sk_buff *skb)
{
        struct ixgbevf_adapter *adapter = netdev_priv(rx_ring->netdev);
        __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
        __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
                                             IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
        struct ixgbevf_ipsec *ipsec = adapter->ipsec;
        struct xfrm_offload *xo = NULL;
        struct xfrm_state *xs = NULL;
        struct ipv6hdr *ip6 = NULL;
        struct iphdr *ip4 = NULL;
        struct sec_path *sp;
        void *daddr;
        __be32 spi;
        u8 *c_hdr;
        u8 proto;

        /* Find the IP and crypto headers in the data.
         * We can assume no VLAN header in the way, b/c the
         * hw won't recognize the IPsec packet and anyway the
         * currently VLAN device doesn't support xfrm offload.
         */
        if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
                ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
                daddr = &ip4->daddr;
                c_hdr = (u8 *)ip4 + ip4->ihl * 4;
        } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
                ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
                daddr = &ip6->daddr;
                c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
        } else {
                return;
        }

        switch (pkt_info & ipsec_pkt_types) {
        case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
                spi = ((struct ip_auth_hdr *)c_hdr)->spi;
                proto = IPPROTO_AH;
                break;
        case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
                spi = ((struct ip_esp_hdr *)c_hdr)->spi;
                proto = IPPROTO_ESP;
                break;
        default:
                return;
        }

        xs = ixgbevf_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
        if (unlikely(!xs))
                return;

        sp = secpath_set(skb);
        if (unlikely(!sp))
                return;

        sp->xvec[sp->len++] = xs;
        sp->olen++;
        xo = xfrm_offload(skb);
        xo->flags = CRYPTO_DONE;
        xo->status = CRYPTO_SUCCESS;

        adapter->rx_ipsec++;
}

/**
 * ixgbevf_init_ipsec_offload - initialize registers for IPsec operation
 * @adapter: board private structure
 **/
void ixgbevf_init_ipsec_offload(struct ixgbevf_adapter *adapter)
{
        struct ixgbevf_ipsec *ipsec;
        size_t size;

        switch (adapter->hw.api_version) {
        case ixgbe_mbox_api_14:
                break;
        default:
                return;
        }

        ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
        if (!ipsec)
                goto err1;
        hash_init(ipsec->rx_sa_list);

        size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
        ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
        if (!ipsec->rx_tbl)
                goto err2;

        size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
        ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
        if (!ipsec->tx_tbl)
                goto err2;

        ipsec->num_rx_sa = 0;
        ipsec->num_tx_sa = 0;

        adapter->ipsec = ipsec;

        adapter->netdev->xfrmdev_ops = &ixgbevf_xfrmdev_ops;

#define IXGBEVF_ESP_FEATURES    (NETIF_F_HW_ESP | \
                                 NETIF_F_HW_ESP_TX_CSUM | \
                                 NETIF_F_GSO_ESP)

        adapter->netdev->features |= IXGBEVF_ESP_FEATURES;
        adapter->netdev->hw_enc_features |= IXGBEVF_ESP_FEATURES;

        return;

err2:
        kfree(ipsec->rx_tbl);
        kfree(ipsec->tx_tbl);
        kfree(ipsec);
err1:
        netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
}

/**
 * ixgbevf_stop_ipsec_offload - tear down the IPsec offload
 * @adapter: board private structure
 **/
void ixgbevf_stop_ipsec_offload(struct ixgbevf_adapter *adapter)
{
        struct ixgbevf_ipsec *ipsec = adapter->ipsec;

        adapter->ipsec = NULL;
        if (ipsec) {
                kfree(ipsec->rx_tbl);
                kfree(ipsec->tx_tbl);
                kfree(ipsec);
        }
}