// 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->dir = xs->xso.dir;
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 = ixgbevf_write_mbx(hw, msgbuf, IXGBE_VFMAILBOX_SIZE);
if (ret)
goto out;
ret = ixgbevf_poll_mbx(hw, msgbuf, 2);
if (ret)
goto out;
ret = (int)msgbuf[1];
if (msgbuf[0] & IXGBE_VT_MSGTYPE_FAILURE && 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 = ixgbevf_write_mbx(hw, msgbuf, 2);
if (err)
goto out;
err = ixgbevf_poll_mbx(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.real_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
* @extack: extack point to fill failure reason
**/
static int ixgbevf_ipsec_add_sa(struct xfrm_state *xs,
struct netlink_ext_ack *extack)
{
struct net_device *dev = xs->xso.real_dev;
struct ixgbevf_adapter *adapter;
struct ixgbevf_ipsec *ipsec;
u16 sa_idx;
int ret;
adapter = netdev_priv(dev);
ipsec = adapter->ipsec;
if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol for IPsec offload");
return -EINVAL;
}
if (xs->props.mode != XFRM_MODE_TRANSPORT) {
NL_SET_ERR_MSG_MOD(extack, "Unsupported mode for ipsec offload");
return -EINVAL;
}
if (xs->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
NL_SET_ERR_MSG_MOD(extack, "Unsupported ipsec offload type");
return -EINVAL;
}
if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
struct rx_sa rsa;
if (xs->calg) {
NL_SET_ERR_MSG_MOD(extack, "Compression offload not supported");
return -EINVAL;
}
/* find the first unused index */
ret = ixgbevf_ipsec_find_empty_idx(ipsec, true);
if (ret < 0) {
NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx table!");
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) {
NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Rx SA table");
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) {
NL_SET_ERR_MSG_MOD(extack, "No space for SA in Tx table");
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) {
NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Tx SA table");
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.real_dev;
struct ixgbevf_adapter *adapter;
struct ixgbevf_ipsec *ipsec;
u16 sa_idx;
adapter = netdev_priv(dev);
ipsec = adapter->ipsec;
if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
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:
case ixgbe_mbox_api_15:
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);
}
}
Codebase Browser
linux