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linux/linux-5.4.31/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c

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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2017 Oracle and/or its affiliates. All rights reserved. */
#include "ixgbe.h"
#include <net/xfrm.h>
#include <crypto/aead.h>
#include <linux/if_bridge.h>
#define IXGBE_IPSEC_KEY_BITS 160
static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
static void ixgbe_ipsec_del_sa(struct xfrm_state *xs);
/**
* ixgbe_ipsec_set_tx_sa - set the Tx SA registers
* @hw: hw specific details
* @idx: register index to write
* @key: key byte array
* @salt: salt bytes
**/
static void ixgbe_ipsec_set_tx_sa(struct ixgbe_hw *hw, u16 idx,
u32 key[], u32 salt)
{
u32 reg;
int i;
for (i = 0; i < 4; i++)
IXGBE_WRITE_REG(hw, IXGBE_IPSTXKEY(i),
(__force u32)cpu_to_be32(key[3 - i]));
IXGBE_WRITE_REG(hw, IXGBE_IPSTXSALT, (__force u32)cpu_to_be32(salt));
IXGBE_WRITE_FLUSH(hw);
reg = IXGBE_READ_REG(hw, IXGBE_IPSTXIDX);
reg &= IXGBE_RXTXIDX_IPS_EN;
reg |= idx << IXGBE_RXTXIDX_IDX_SHIFT | IXGBE_RXTXIDX_WRITE;
IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, reg);
IXGBE_WRITE_FLUSH(hw);
}
/**
* ixgbe_ipsec_set_rx_item - set an Rx table item
* @hw: hw specific details
* @idx: register index to write
* @tbl: table selector
*
* Trigger the device to store into a particular Rx table the
* data that has already been loaded into the input register
**/
static void ixgbe_ipsec_set_rx_item(struct ixgbe_hw *hw, u16 idx,
enum ixgbe_ipsec_tbl_sel tbl)
{
u32 reg;
reg = IXGBE_READ_REG(hw, IXGBE_IPSRXIDX);
reg &= IXGBE_RXTXIDX_IPS_EN;
reg |= tbl << IXGBE_RXIDX_TBL_SHIFT |
idx << IXGBE_RXTXIDX_IDX_SHIFT |
IXGBE_RXTXIDX_WRITE;
IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, reg);
IXGBE_WRITE_FLUSH(hw);
}
/**
* ixgbe_ipsec_set_rx_sa - set up the register bits to save SA info
* @hw: hw specific details
* @idx: register index to write
* @spi: security parameter index
* @key: key byte array
* @salt: salt bytes
* @mode: rx decrypt control bits
* @ip_idx: index into IP table for related IP address
**/
static void ixgbe_ipsec_set_rx_sa(struct ixgbe_hw *hw, u16 idx, __be32 spi,
u32 key[], u32 salt, u32 mode, u32 ip_idx)
{
int i;
/* store the SPI (in bigendian) and IPidx */
IXGBE_WRITE_REG(hw, IXGBE_IPSRXSPI,
(__force u32)cpu_to_le32((__force u32)spi));
IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPIDX, ip_idx);
IXGBE_WRITE_FLUSH(hw);
ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_spi_tbl);
/* store the key, salt, and mode */
for (i = 0; i < 4; i++)
IXGBE_WRITE_REG(hw, IXGBE_IPSRXKEY(i),
(__force u32)cpu_to_be32(key[3 - i]));
IXGBE_WRITE_REG(hw, IXGBE_IPSRXSALT, (__force u32)cpu_to_be32(salt));
IXGBE_WRITE_REG(hw, IXGBE_IPSRXMOD, mode);
IXGBE_WRITE_FLUSH(hw);
ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_key_tbl);
}
/**
* ixgbe_ipsec_set_rx_ip - set up the register bits to save SA IP addr info
* @hw: hw specific details
* @idx: register index to write
* @addr: IP address byte array
**/
static void ixgbe_ipsec_set_rx_ip(struct ixgbe_hw *hw, u16 idx, __be32 addr[])
{
int i;
/* store the ip address */
for (i = 0; i < 4; i++)
IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPADDR(i),
(__force u32)cpu_to_le32((__force u32)addr[i]));
IXGBE_WRITE_FLUSH(hw);
ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_ip_tbl);
}
/**
* ixgbe_ipsec_clear_hw_tables - because some tables don't get cleared on reset
* @adapter: board private structure
**/
static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
u32 buf[4] = {0, 0, 0, 0};
u16 idx;
/* disable Rx and Tx SA lookup */
IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
/* scrub the tables - split the loops for the max of the IP table */
for (idx = 0; idx < IXGBE_IPSEC_MAX_RX_IP_COUNT; idx++) {
ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
ixgbe_ipsec_set_rx_ip(hw, idx, (__be32 *)buf);
}
for (; idx < IXGBE_IPSEC_MAX_SA_COUNT; idx++) {
ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
}
}
/**
* ixgbe_ipsec_stop_data
* @adapter: board private structure
**/
static void ixgbe_ipsec_stop_data(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
bool link = adapter->link_up;
u32 t_rdy, r_rdy;
u32 limit;
u32 reg;
/* halt data paths */
reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
reg |= IXGBE_SECTXCTRL_TX_DIS;
IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
reg |= IXGBE_SECRXCTRL_RX_DIS;
IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
/* If both Tx and Rx are ready there are no packets
* that we need to flush so the loopback configuration
* below is not necessary.
*/
t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
IXGBE_SECTXSTAT_SECTX_RDY;
r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
IXGBE_SECRXSTAT_SECRX_RDY;
if (t_rdy && r_rdy)
return;
/* If the tx fifo doesn't have link, but still has data,
* we can't clear the tx sec block. Set the MAC loopback
* before block clear
*/
if (!link) {
reg = IXGBE_READ_REG(hw, IXGBE_MACC);
reg |= IXGBE_MACC_FLU;
IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
reg |= IXGBE_HLREG0_LPBK;
IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
IXGBE_WRITE_FLUSH(hw);
mdelay(3);
}
/* wait for the paths to empty */
limit = 20;
do {
mdelay(10);
t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
IXGBE_SECTXSTAT_SECTX_RDY;
r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
IXGBE_SECRXSTAT_SECRX_RDY;
} while (!(t_rdy && r_rdy) && limit--);
/* undo loopback if we played with it earlier */
if (!link) {
reg = IXGBE_READ_REG(hw, IXGBE_MACC);
reg &= ~IXGBE_MACC_FLU;
IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
reg &= ~IXGBE_HLREG0_LPBK;
IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
IXGBE_WRITE_FLUSH(hw);
}
}
/**
* ixgbe_ipsec_stop_engine
* @adapter: board private structure
**/
static void ixgbe_ipsec_stop_engine(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
u32 reg;
ixgbe_ipsec_stop_data(adapter);
/* disable Rx and Tx SA lookup */
IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
/* disable the Rx and Tx engines and full packet store-n-forward */
reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
reg |= IXGBE_SECTXCTRL_SECTX_DIS;
reg &= ~IXGBE_SECTXCTRL_STORE_FORWARD;
IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
reg |= IXGBE_SECRXCTRL_SECRX_DIS;
IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
/* restore the "tx security buffer almost full threshold" to 0x250 */
IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, 0x250);
/* Set minimum IFG between packets back to the default 0x1 */
reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
reg = (reg & 0xfffffff0) | 0x1;
IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
/* final set for normal (no ipsec offload) processing */
IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_SECTX_DIS);
IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, IXGBE_SECRXCTRL_SECRX_DIS);
IXGBE_WRITE_FLUSH(hw);
}
/**
* ixgbe_ipsec_start_engine
* @adapter: board private structure
*
* NOTE: this increases power consumption whether being used or not
**/
static void ixgbe_ipsec_start_engine(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
u32 reg;
ixgbe_ipsec_stop_data(adapter);
/* Set minimum IFG between packets to 3 */
reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
reg = (reg & 0xfffffff0) | 0x3;
IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
/* Set "tx security buffer almost full threshold" to 0x15 so that the
* almost full indication is generated only after buffer contains at
* least an entire jumbo packet.
*/
reg = IXGBE_READ_REG(hw, IXGBE_SECTXBUFFAF);
reg = (reg & 0xfffffc00) | 0x15;
IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, reg);
/* restart the data paths by clearing the DISABLE bits */
IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, 0);
IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_STORE_FORWARD);
/* enable Rx and Tx SA lookup */
IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, IXGBE_RXTXIDX_IPS_EN);
IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, IXGBE_RXTXIDX_IPS_EN);
IXGBE_WRITE_FLUSH(hw);
}
/**
* ixgbe_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.
*
* Any VF entries are removed from the SW and HW tables since either
* (a) the VF also gets reset on PF reset and will ask again for the
* offloads, or (b) the VF has been removed by a change in the num_vfs.
**/
void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter)
{
struct ixgbe_ipsec *ipsec = adapter->ipsec;
struct ixgbe_hw *hw = &adapter->hw;
int i;
if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED))
return;
/* clean up and restart the engine */
ixgbe_ipsec_stop_engine(adapter);
ixgbe_ipsec_clear_hw_tables(adapter);
ixgbe_ipsec_start_engine(adapter);
/* 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];
if (r->used) {
if (r->mode & IXGBE_RXTXMOD_VF)
ixgbe_ipsec_del_sa(r->xs);
else
ixgbe_ipsec_set_rx_sa(hw, i, r->xs->id.spi,
r->key, r->salt,
r->mode, r->iptbl_ind);
}
if (t->used) {
if (t->mode & IXGBE_RXTXMOD_VF)
ixgbe_ipsec_del_sa(t->xs);
else
ixgbe_ipsec_set_tx_sa(hw, i, t->key, t->salt);
}
}
/* reload the IP addrs */
for (i = 0; i < IXGBE_IPSEC_MAX_RX_IP_COUNT; i++) {
struct rx_ip_sa *ipsa = &ipsec->ip_tbl[i];
if (ipsa->used)
ixgbe_ipsec_set_rx_ip(hw, i, ipsa->ipaddr);
}
}
/**
* ixgbe_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 ixgbe_ipsec_find_empty_idx(struct ixgbe_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;
}
/**
* ixgbe_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 *ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec *ipsec,
__be32 *daddr, u8 proto,
__be32 spi, bool ip4)
{
struct rx_sa *rsa;
struct xfrm_state *ret = NULL;
rcu_read_lock();
hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
(__force u32)spi) {
if (rsa->mode & IXGBE_RXTXMOD_VF)
continue;
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;
}
/**
* ixgbe_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 ixgbe_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 bigendian array of bytes, so
* we don't need to do any byteswapping.
* 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 - (sizeof(*mysalt) * 8))) {
netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
return -EINVAL;
} else {
netdev_info(dev, "IPsec hw offload parameters missing 32 bit salt value\n");
*mysalt = 0;
}
memcpy(mykey, key_data, 16);
return 0;
}
/**
* ixgbe_ipsec_check_mgmt_ip - make sure there is no clash with mgmt IP filters
* @xs: pointer to transformer state struct
**/
static int ixgbe_ipsec_check_mgmt_ip(struct xfrm_state *xs)
{
struct net_device *dev = xs->xso.dev;
struct ixgbe_adapter *adapter = netdev_priv(dev);
struct ixgbe_hw *hw = &adapter->hw;
u32 mfval, manc, reg;
int num_filters = 4;
bool manc_ipv4;
u32 bmcipval;
int i, j;
#define MANC_EN_IPV4_FILTER BIT(24)
#define MFVAL_IPV4_FILTER_SHIFT 16
#define MFVAL_IPV6_FILTER_SHIFT 24
#define MIPAF_ARR(_m, _n) (IXGBE_MIPAF + ((_m) * 0x10) + ((_n) * 4))
#define IXGBE_BMCIP(_n) (0x5050 + ((_n) * 4))
#define IXGBE_BMCIPVAL 0x5060
#define BMCIP_V4 0x2
#define BMCIP_V6 0x3
#define BMCIP_MASK 0x3
manc = IXGBE_READ_REG(hw, IXGBE_MANC);
manc_ipv4 = !!(manc & MANC_EN_IPV4_FILTER);
mfval = IXGBE_READ_REG(hw, IXGBE_MFVAL);
bmcipval = IXGBE_READ_REG(hw, IXGBE_BMCIPVAL);
if (xs->props.family == AF_INET) {
/* are there any IPv4 filters to check? */
if (manc_ipv4) {
/* the 4 ipv4 filters are all in MIPAF(3, i) */
for (i = 0; i < num_filters; i++) {
if (!(mfval & BIT(MFVAL_IPV4_FILTER_SHIFT + i)))
continue;
reg = IXGBE_READ_REG(hw, MIPAF_ARR(3, i));
if (reg == xs->id.daddr.a4)
return 1;
}
}
if ((bmcipval & BMCIP_MASK) == BMCIP_V4) {
reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(3));
if (reg == xs->id.daddr.a4)
return 1;
}
} else {
/* if there are ipv4 filters, they are in the last ipv6 slot */
if (manc_ipv4)
num_filters = 3;
for (i = 0; i < num_filters; i++) {
if (!(mfval & BIT(MFVAL_IPV6_FILTER_SHIFT + i)))
continue;
for (j = 0; j < 4; j++) {
reg = IXGBE_READ_REG(hw, MIPAF_ARR(i, j));
if (reg != xs->id.daddr.a6[j])
break;
}
if (j == 4) /* did we match all 4 words? */
return 1;
}
if ((bmcipval & BMCIP_MASK) == BMCIP_V6) {
for (j = 0; j < 4; j++) {
reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(j));
if (reg != xs->id.daddr.a6[j])
break;
}
if (j == 4) /* did we match all 4 words? */
return 1;
}
}
return 0;
}
/**
* ixgbe_ipsec_add_sa - program device with a security association
* @xs: pointer to transformer state struct
**/
static int ixgbe_ipsec_add_sa(struct xfrm_state *xs)
{
struct net_device *dev = xs->xso.dev;
struct ixgbe_adapter *adapter = netdev_priv(dev);
struct ixgbe_ipsec *ipsec = adapter->ipsec;
struct ixgbe_hw *hw = &adapter->hw;
int checked, match, first;
u16 sa_idx;
int ret;
int i;
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 (ixgbe_ipsec_check_mgmt_ip(xs)) {
netdev_err(dev, "IPsec IP addr clash with mgmt filters\n");
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 = ixgbe_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 = ixgbe_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);
/* The HW does not have a 1:1 mapping from keys to IP addrs, so
* check for a matching IP addr entry in the table. If the addr
* already exists, use it; else find an unused slot and add the
* addr. If one does not exist and there are no unused table
* entries, fail the request.
*/
/* Find an existing match or first not used, and stop looking
* after we've checked all we know we have.
*/
checked = 0;
match = -1;
first = -1;
for (i = 0;
i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
(checked < ipsec->num_rx_sa || first < 0);
i++) {
if (ipsec->ip_tbl[i].used) {
if (!memcmp(ipsec->ip_tbl[i].ipaddr,
rsa.ipaddr, sizeof(rsa.ipaddr))) {
match = i;
break;
}
checked++;
} else if (first < 0) {
first = i; /* track the first empty seen */
}
}
if (ipsec->num_rx_sa == 0)
first = 0;
if (match >= 0) {
/* addrs are the same, we should use this one */
rsa.iptbl_ind = match;
ipsec->ip_tbl[match].ref_cnt++;
} else if (first >= 0) {
/* no matches, but here's an empty slot */
rsa.iptbl_ind = first;
memcpy(ipsec->ip_tbl[first].ipaddr,
rsa.ipaddr, sizeof(rsa.ipaddr));
ipsec->ip_tbl[first].ref_cnt = 1;
ipsec->ip_tbl[first].used = true;
ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
} else {
/* no match and no empty slot */
netdev_err(dev, "No space for SA in Rx IP SA table\n");
memset(&rsa, 0, sizeof(rsa));
return -ENOSPC;
}
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;
/* the preparations worked, so save the info */
memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
rsa.salt, rsa.mode, rsa.iptbl_ind);
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;
if (adapter->num_vfs &&
adapter->bridge_mode != BRIDGE_MODE_VEPA)
return -EOPNOTSUPP;
/* find the first unused index */
ret = ixgbe_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 = ixgbe_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;
}
/* the preparations worked, so save the info */
memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
ipsec->num_tx_sa++;
}
/* enable the engine if not already warmed up */
if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
ixgbe_ipsec_start_engine(adapter);
adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
}
return 0;
}
/**
* ixgbe_ipsec_del_sa - clear out this specific SA
* @xs: pointer to transformer state struct
**/
static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
{
struct net_device *dev = xs->xso.dev;
struct ixgbe_adapter *adapter = netdev_priv(dev);
struct ixgbe_ipsec *ipsec = adapter->ipsec;
struct ixgbe_hw *hw = &adapter->hw;
u32 zerobuf[4] = {0, 0, 0, 0};
u16 sa_idx;
if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
struct rx_sa *rsa;
u8 ipi;
sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
rsa = &ipsec->rx_tbl[sa_idx];
if (!rsa->used) {
netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
sa_idx, xs->xso.offload_handle);
return;
}
ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
hash_del_rcu(&rsa->hlist);
/* if the IP table entry is referenced by only this SA,
* i.e. ref_cnt is only 1, clear the IP table entry as well
*/
ipi = rsa->iptbl_ind;
if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
ipsec->ip_tbl[ipi].ref_cnt--;
if (!ipsec->ip_tbl[ipi].ref_cnt) {
memset(&ipsec->ip_tbl[ipi], 0,
sizeof(struct rx_ip_sa));
ixgbe_ipsec_set_rx_ip(hw, ipi,
(__force __be32 *)zerobuf);
}
}
memset(rsa, 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;
}
ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
ipsec->num_tx_sa--;
}
/* if there are no SAs left, stop the engine to save energy */
if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
ixgbe_ipsec_stop_engine(adapter);
}
}
/**
* ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
* @skb: current data packet
* @xs: pointer to transformer state struct
**/
static bool ixgbe_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 ixgbe_xfrmdev_ops = {
.xdo_dev_state_add = ixgbe_ipsec_add_sa,
.xdo_dev_state_delete = ixgbe_ipsec_del_sa,
.xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
};
/**
* ixgbe_ipsec_vf_clear - clear the tables of data for a VF
* @adapter: board private structure
* @vf: VF id to be removed
**/
void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
{
struct ixgbe_ipsec *ipsec = adapter->ipsec;
int i;
if (!ipsec)
return;
/* search rx sa table */
for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
if (!ipsec->rx_tbl[i].used)
continue;
if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
ipsec->rx_tbl[i].vf == vf)
ixgbe_ipsec_del_sa(ipsec->rx_tbl[i].xs);
}
/* search tx sa table */
for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
if (!ipsec->tx_tbl[i].used)
continue;
if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
ipsec->tx_tbl[i].vf == vf)
ixgbe_ipsec_del_sa(ipsec->tx_tbl[i].xs);
}
}
/**
* ixgbe_ipsec_vf_add_sa - translate VF request to SA add
* @adapter: board private structure
* @msgbuf: The message buffer
* @vf: the VF index
*
* Make up a new xs and algorithm info from the data sent by the VF.
* We only need to sketch in just enough to set up the HW offload.
* Put the resulting offload_handle into the return message to the VF.
*
* Returns 0 or error value
**/
int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
{
struct ixgbe_ipsec *ipsec = adapter->ipsec;
struct xfrm_algo_desc *algo;
struct sa_mbx_msg *sam;
struct xfrm_state *xs;
size_t aead_len;
u16 sa_idx;
u32 pfsa;
int err;
sam = (struct sa_mbx_msg *)(&msgbuf[1]);
if (!adapter->vfinfo[vf].trusted ||
!(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
err = -EACCES;
goto err_out;
}
/* Tx IPsec offload doesn't seem to work on this
* device, so block these requests for now.
*/
if (!(sam->flags & XFRM_OFFLOAD_INBOUND)) {
err = -EOPNOTSUPP;
goto err_out;
}
xs = kzalloc(sizeof(*xs), GFP_KERNEL);
if (unlikely(!xs)) {
err = -ENOMEM;
goto err_out;
}
xs->xso.flags = sam->flags;
xs->id.spi = sam->spi;
xs->id.proto = sam->proto;
xs->props.family = sam->family;
if (xs->props.family == AF_INET6)
memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
else
memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
xs->xso.dev = adapter->netdev;
algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
if (unlikely(!algo)) {
err = -ENOENT;
goto err_xs;
}
aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
xs->aead = kzalloc(aead_len, GFP_KERNEL);
if (unlikely(!xs->aead)) {
err = -ENOMEM;
goto err_xs;
}
xs->props.ealgo = algo->desc.sadb_alg_id;
xs->geniv = algo->uinfo.aead.geniv;
xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
/* set up the HW offload */
err = ixgbe_ipsec_add_sa(xs);
if (err)
goto err_aead;
pfsa = xs->xso.offload_handle;
if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
ipsec->rx_tbl[sa_idx].vf = vf;
ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
} else {
sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
ipsec->tx_tbl[sa_idx].vf = vf;
ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
}
msgbuf[1] = xs->xso.offload_handle;
return 0;
err_aead:
kzfree(xs->aead);
err_xs:
kzfree(xs);
err_out:
msgbuf[1] = err;
return err;
}
/**
* ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
* @adapter: board private structure
* @msgbuf: The message buffer
* @vf: the VF index
*
* Given the offload_handle sent by the VF, look for the related SA table
* entry and use its xs field to call for a delete of the SA.
*
* Note: We silently ignore requests to delete entries that are already
* set to unused because when a VF is set to "DOWN", the PF first
* gets a reset and clears all the VF's entries; then the VF's
* XFRM stack sends individual deletes for each entry, which the
* reset already removed. In the future it might be good to try to
* optimize this so not so many unnecessary delete messages are sent.
*
* Returns 0 or error value
**/
int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
{
struct ixgbe_ipsec *ipsec = adapter->ipsec;
struct xfrm_state *xs;
u32 pfsa = msgbuf[1];
u16 sa_idx;
if (!adapter->vfinfo[vf].trusted) {
e_err(drv, "vf %d attempted to delete an SA\n", vf);
return -EPERM;
}
if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
struct rx_sa *rsa;
sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
e_err(drv, "vf %d SA index %d out of range\n",
vf, sa_idx);
return -EINVAL;
}
rsa = &ipsec->rx_tbl[sa_idx];
if (!rsa->used)
return 0;
if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
rsa->vf != vf) {
e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
return -ENOENT;
}
xs = ipsec->rx_tbl[sa_idx].xs;
} else {
struct tx_sa *tsa;
sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
e_err(drv, "vf %d SA index %d out of range\n",
vf, sa_idx);
return -EINVAL;
}
tsa = &ipsec->tx_tbl[sa_idx];
if (!tsa->used)
return 0;
if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
tsa->vf != vf) {
e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
return -ENOENT;
}
xs = ipsec->tx_tbl[sa_idx].xs;
}
ixgbe_ipsec_del_sa(xs);
/* remove the xs that was made-up in the add request */
kzfree(xs);
return 0;
}
/**
* ixgbe_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 ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
struct ixgbe_tx_buffer *first,
struct ixgbe_ipsec_tx_data *itd)
{
struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
struct ixgbe_ipsec *ipsec = adapter->ipsec;
struct xfrm_state *xs;
struct sec_path *sp;
struct tx_sa *tsa;
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;
}
itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
__func__, itd->sa_idx, xs->xso.offload_handle);
return 0;
}
tsa = &ipsec->tx_tbl[itd->sa_idx];
if (unlikely(!tsa->used)) {
netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
__func__, itd->sa_idx);
return 0;
}
first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
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;
}
/**
* ixgbe_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 ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
union ixgbe_adv_rx_desc *rx_desc,
struct sk_buff *skb)
{
struct ixgbe_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 ixgbe_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 = ixgbe_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++;
}
/**
* ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
* @adapter: board private structure
**/
void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
struct ixgbe_ipsec *ipsec;
u32 t_dis, r_dis;
size_t size;
if (hw->mac.type == ixgbe_mac_82598EB)
return;
/* If there is no support for either Tx or Rx offload
* we should not be advertising support for IPsec.
*/
t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
IXGBE_SECTXSTAT_SECTX_OFF_DIS;
r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
IXGBE_SECRXSTAT_SECRX_OFF_DIS;
if (t_dis || r_dis)
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;
size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
if (!ipsec->ip_tbl)
goto err2;
ipsec->num_rx_sa = 0;
ipsec->num_tx_sa = 0;
adapter->ipsec = ipsec;
ixgbe_ipsec_stop_engine(adapter);
ixgbe_ipsec_clear_hw_tables(adapter);
adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
return;
err2:
kfree(ipsec->ip_tbl);
kfree(ipsec->rx_tbl);
kfree(ipsec->tx_tbl);
kfree(ipsec);
err1:
netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
}
/**
* ixgbe_stop_ipsec_offload - tear down the ipsec offload
* @adapter: board private structure
**/
void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
{
struct ixgbe_ipsec *ipsec = adapter->ipsec;
adapter->ipsec = NULL;
if (ipsec) {
kfree(ipsec->ip_tbl);
kfree(ipsec->rx_tbl);
kfree(ipsec->tx_tbl);
kfree(ipsec);
}
}
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