1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2017 Oracle and/or its affiliates. All rights reserved. */
3
4 #include "ixgbe.h"
5 #include <net/xfrm.h>
6 #include <crypto/aead.h>
7 #include <linux/if_bridge.h>
8
9 #define IXGBE_IPSEC_KEY_BITS 160
10 static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
11
12 static void ixgbe_ipsec_del_sa(struct net_device *dev, struct xfrm_state *xs);
13
14 /**
15 * ixgbe_ipsec_set_tx_sa - set the Tx SA registers
16 * @hw: hw specific details
17 * @idx: register index to write
18 * @key: key byte array
19 * @salt: salt bytes
20 **/
ixgbe_ipsec_set_tx_sa(struct ixgbe_hw * hw,u16 idx,u32 key[],u32 salt)21 static void ixgbe_ipsec_set_tx_sa(struct ixgbe_hw *hw, u16 idx,
22 u32 key[], u32 salt)
23 {
24 u32 reg;
25 int i;
26
27 for (i = 0; i < 4; i++)
28 IXGBE_WRITE_REG(hw, IXGBE_IPSTXKEY(i),
29 (__force u32)cpu_to_be32(key[3 - i]));
30 IXGBE_WRITE_REG(hw, IXGBE_IPSTXSALT, (__force u32)cpu_to_be32(salt));
31 IXGBE_WRITE_FLUSH(hw);
32
33 reg = IXGBE_READ_REG(hw, IXGBE_IPSTXIDX);
34 reg &= IXGBE_RXTXIDX_IPS_EN;
35 reg |= idx << IXGBE_RXTXIDX_IDX_SHIFT | IXGBE_RXTXIDX_WRITE;
36 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, reg);
37 IXGBE_WRITE_FLUSH(hw);
38 }
39
40 /**
41 * ixgbe_ipsec_set_rx_item - set an Rx table item
42 * @hw: hw specific details
43 * @idx: register index to write
44 * @tbl: table selector
45 *
46 * Trigger the device to store into a particular Rx table the
47 * data that has already been loaded into the input register
48 **/
ixgbe_ipsec_set_rx_item(struct ixgbe_hw * hw,u16 idx,enum ixgbe_ipsec_tbl_sel tbl)49 static void ixgbe_ipsec_set_rx_item(struct ixgbe_hw *hw, u16 idx,
50 enum ixgbe_ipsec_tbl_sel tbl)
51 {
52 u32 reg;
53
54 reg = IXGBE_READ_REG(hw, IXGBE_IPSRXIDX);
55 reg &= IXGBE_RXTXIDX_IPS_EN;
56 reg |= tbl << IXGBE_RXIDX_TBL_SHIFT |
57 idx << IXGBE_RXTXIDX_IDX_SHIFT |
58 IXGBE_RXTXIDX_WRITE;
59 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, reg);
60 IXGBE_WRITE_FLUSH(hw);
61 }
62
63 /**
64 * ixgbe_ipsec_set_rx_sa - set up the register bits to save SA info
65 * @hw: hw specific details
66 * @idx: register index to write
67 * @spi: security parameter index
68 * @key: key byte array
69 * @salt: salt bytes
70 * @mode: rx decrypt control bits
71 * @ip_idx: index into IP table for related IP address
72 **/
ixgbe_ipsec_set_rx_sa(struct ixgbe_hw * hw,u16 idx,__be32 spi,u32 key[],u32 salt,u32 mode,u32 ip_idx)73 static void ixgbe_ipsec_set_rx_sa(struct ixgbe_hw *hw, u16 idx, __be32 spi,
74 u32 key[], u32 salt, u32 mode, u32 ip_idx)
75 {
76 int i;
77
78 /* store the SPI (in bigendian) and IPidx */
79 IXGBE_WRITE_REG(hw, IXGBE_IPSRXSPI,
80 (__force u32)cpu_to_le32((__force u32)spi));
81 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPIDX, ip_idx);
82 IXGBE_WRITE_FLUSH(hw);
83
84 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_spi_tbl);
85
86 /* store the key, salt, and mode */
87 for (i = 0; i < 4; i++)
88 IXGBE_WRITE_REG(hw, IXGBE_IPSRXKEY(i),
89 (__force u32)cpu_to_be32(key[3 - i]));
90 IXGBE_WRITE_REG(hw, IXGBE_IPSRXSALT, (__force u32)cpu_to_be32(salt));
91 IXGBE_WRITE_REG(hw, IXGBE_IPSRXMOD, mode);
92 IXGBE_WRITE_FLUSH(hw);
93
94 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_key_tbl);
95 }
96
97 /**
98 * ixgbe_ipsec_set_rx_ip - set up the register bits to save SA IP addr info
99 * @hw: hw specific details
100 * @idx: register index to write
101 * @addr: IP address byte array
102 **/
ixgbe_ipsec_set_rx_ip(struct ixgbe_hw * hw,u16 idx,__be32 addr[])103 static void ixgbe_ipsec_set_rx_ip(struct ixgbe_hw *hw, u16 idx, __be32 addr[])
104 {
105 int i;
106
107 /* store the ip address */
108 for (i = 0; i < 4; i++)
109 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPADDR(i),
110 (__force u32)cpu_to_le32((__force u32)addr[i]));
111 IXGBE_WRITE_FLUSH(hw);
112
113 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_ip_tbl);
114 }
115
116 /**
117 * ixgbe_ipsec_clear_hw_tables - because some tables don't get cleared on reset
118 * @adapter: board private structure
119 **/
ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter * adapter)120 static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
121 {
122 struct ixgbe_hw *hw = &adapter->hw;
123 u32 buf[4] = {0, 0, 0, 0};
124 u16 idx;
125
126 /* disable Rx and Tx SA lookup */
127 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
128 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
129
130 /* scrub the tables - split the loops for the max of the IP table */
131 for (idx = 0; idx < IXGBE_IPSEC_MAX_RX_IP_COUNT; idx++) {
132 ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
133 ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
134 ixgbe_ipsec_set_rx_ip(hw, idx, (__be32 *)buf);
135 }
136 for (; idx < IXGBE_IPSEC_MAX_SA_COUNT; idx++) {
137 ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
138 ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
139 }
140 }
141
142 /**
143 * ixgbe_ipsec_stop_data
144 * @adapter: board private structure
145 **/
ixgbe_ipsec_stop_data(struct ixgbe_adapter * adapter)146 static void ixgbe_ipsec_stop_data(struct ixgbe_adapter *adapter)
147 {
148 struct ixgbe_hw *hw = &adapter->hw;
149 bool link = adapter->link_up;
150 u32 t_rdy, r_rdy;
151 u32 limit;
152 u32 reg;
153
154 /* halt data paths */
155 reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
156 reg |= IXGBE_SECTXCTRL_TX_DIS;
157 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
158
159 reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
160 reg |= IXGBE_SECRXCTRL_RX_DIS;
161 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
162
163 /* If both Tx and Rx are ready there are no packets
164 * that we need to flush so the loopback configuration
165 * below is not necessary.
166 */
167 t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
168 IXGBE_SECTXSTAT_SECTX_RDY;
169 r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
170 IXGBE_SECRXSTAT_SECRX_RDY;
171 if (t_rdy && r_rdy)
172 return;
173
174 /* If the tx fifo doesn't have link, but still has data,
175 * we can't clear the tx sec block. Set the MAC loopback
176 * before block clear
177 */
178 if (!link) {
179 reg = IXGBE_READ_REG(hw, IXGBE_MACC);
180 reg |= IXGBE_MACC_FLU;
181 IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
182
183 reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
184 reg |= IXGBE_HLREG0_LPBK;
185 IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
186
187 IXGBE_WRITE_FLUSH(hw);
188 mdelay(3);
189 }
190
191 /* wait for the paths to empty */
192 limit = 20;
193 do {
194 mdelay(10);
195 t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
196 IXGBE_SECTXSTAT_SECTX_RDY;
197 r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
198 IXGBE_SECRXSTAT_SECRX_RDY;
199 } while (!(t_rdy && r_rdy) && limit--);
200
201 /* undo loopback if we played with it earlier */
202 if (!link) {
203 reg = IXGBE_READ_REG(hw, IXGBE_MACC);
204 reg &= ~IXGBE_MACC_FLU;
205 IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
206
207 reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
208 reg &= ~IXGBE_HLREG0_LPBK;
209 IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
210
211 IXGBE_WRITE_FLUSH(hw);
212 }
213 }
214
215 /**
216 * ixgbe_ipsec_stop_engine
217 * @adapter: board private structure
218 **/
ixgbe_ipsec_stop_engine(struct ixgbe_adapter * adapter)219 static void ixgbe_ipsec_stop_engine(struct ixgbe_adapter *adapter)
220 {
221 struct ixgbe_hw *hw = &adapter->hw;
222 u32 reg;
223
224 ixgbe_ipsec_stop_data(adapter);
225
226 /* disable Rx and Tx SA lookup */
227 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
228 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
229
230 /* disable the Rx and Tx engines and full packet store-n-forward */
231 reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
232 reg |= IXGBE_SECTXCTRL_SECTX_DIS;
233 reg &= ~IXGBE_SECTXCTRL_STORE_FORWARD;
234 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
235
236 reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
237 reg |= IXGBE_SECRXCTRL_SECRX_DIS;
238 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
239
240 /* restore the "tx security buffer almost full threshold" to 0x250 */
241 IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, 0x250);
242
243 /* Set minimum IFG between packets back to the default 0x1 */
244 reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
245 reg = (reg & 0xfffffff0) | 0x1;
246 IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
247
248 /* final set for normal (no ipsec offload) processing */
249 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_SECTX_DIS);
250 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, IXGBE_SECRXCTRL_SECRX_DIS);
251
252 IXGBE_WRITE_FLUSH(hw);
253 }
254
255 /**
256 * ixgbe_ipsec_start_engine
257 * @adapter: board private structure
258 *
259 * NOTE: this increases power consumption whether being used or not
260 **/
ixgbe_ipsec_start_engine(struct ixgbe_adapter * adapter)261 static void ixgbe_ipsec_start_engine(struct ixgbe_adapter *adapter)
262 {
263 struct ixgbe_hw *hw = &adapter->hw;
264 u32 reg;
265
266 ixgbe_ipsec_stop_data(adapter);
267
268 /* Set minimum IFG between packets to 3 */
269 reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
270 reg = (reg & 0xfffffff0) | 0x3;
271 IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
272
273 /* Set "tx security buffer almost full threshold" to 0x15 so that the
274 * almost full indication is generated only after buffer contains at
275 * least an entire jumbo packet.
276 */
277 reg = IXGBE_READ_REG(hw, IXGBE_SECTXBUFFAF);
278 reg = (reg & 0xfffffc00) | 0x15;
279 IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, reg);
280
281 /* restart the data paths by clearing the DISABLE bits */
282 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, 0);
283 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_STORE_FORWARD);
284
285 /* enable Rx and Tx SA lookup */
286 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, IXGBE_RXTXIDX_IPS_EN);
287 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, IXGBE_RXTXIDX_IPS_EN);
288
289 IXGBE_WRITE_FLUSH(hw);
290 }
291
292 /**
293 * ixgbe_ipsec_restore - restore the ipsec HW settings after a reset
294 * @adapter: board private structure
295 *
296 * Reload the HW tables from the SW tables after they've been bashed
297 * by a chip reset.
298 *
299 * Any VF entries are removed from the SW and HW tables since either
300 * (a) the VF also gets reset on PF reset and will ask again for the
301 * offloads, or (b) the VF has been removed by a change in the num_vfs.
302 **/
ixgbe_ipsec_restore(struct ixgbe_adapter * adapter)303 void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter)
304 {
305 struct ixgbe_ipsec *ipsec = adapter->ipsec;
306 struct ixgbe_hw *hw = &adapter->hw;
307 int i;
308
309 if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED))
310 return;
311
312 /* clean up and restart the engine */
313 ixgbe_ipsec_stop_engine(adapter);
314 ixgbe_ipsec_clear_hw_tables(adapter);
315 ixgbe_ipsec_start_engine(adapter);
316
317 /* reload the Rx and Tx keys */
318 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
319 struct rx_sa *r = &ipsec->rx_tbl[i];
320 struct tx_sa *t = &ipsec->tx_tbl[i];
321
322 if (r->used) {
323 if (r->mode & IXGBE_RXTXMOD_VF)
324 ixgbe_ipsec_del_sa(adapter->netdev, r->xs);
325 else
326 ixgbe_ipsec_set_rx_sa(hw, i, r->xs->id.spi,
327 r->key, r->salt,
328 r->mode, r->iptbl_ind);
329 }
330
331 if (t->used) {
332 if (t->mode & IXGBE_RXTXMOD_VF)
333 ixgbe_ipsec_del_sa(adapter->netdev, t->xs);
334 else
335 ixgbe_ipsec_set_tx_sa(hw, i, t->key, t->salt);
336 }
337 }
338
339 /* reload the IP addrs */
340 for (i = 0; i < IXGBE_IPSEC_MAX_RX_IP_COUNT; i++) {
341 struct rx_ip_sa *ipsa = &ipsec->ip_tbl[i];
342
343 if (ipsa->used)
344 ixgbe_ipsec_set_rx_ip(hw, i, ipsa->ipaddr);
345 }
346 }
347
348 /**
349 * ixgbe_ipsec_find_empty_idx - find the first unused security parameter index
350 * @ipsec: pointer to ipsec struct
351 * @rxtable: true if we need to look in the Rx table
352 *
353 * Returns the first unused index in either the Rx or Tx SA table
354 **/
ixgbe_ipsec_find_empty_idx(struct ixgbe_ipsec * ipsec,bool rxtable)355 static int ixgbe_ipsec_find_empty_idx(struct ixgbe_ipsec *ipsec, bool rxtable)
356 {
357 u32 i;
358
359 if (rxtable) {
360 if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
361 return -ENOSPC;
362
363 /* search rx sa table */
364 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
365 if (!ipsec->rx_tbl[i].used)
366 return i;
367 }
368 } else {
369 if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
370 return -ENOSPC;
371
372 /* search tx sa table */
373 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
374 if (!ipsec->tx_tbl[i].used)
375 return i;
376 }
377 }
378
379 return -ENOSPC;
380 }
381
382 /**
383 * ixgbe_ipsec_find_rx_state - find the state that matches
384 * @ipsec: pointer to ipsec struct
385 * @daddr: inbound address to match
386 * @proto: protocol to match
387 * @spi: SPI to match
388 * @ip4: true if using an ipv4 address
389 *
390 * Returns a pointer to the matching SA state information
391 **/
ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec * ipsec,__be32 * daddr,u8 proto,__be32 spi,bool ip4)392 static struct xfrm_state *ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec *ipsec,
393 __be32 *daddr, u8 proto,
394 __be32 spi, bool ip4)
395 {
396 struct rx_sa *rsa;
397 struct xfrm_state *ret = NULL;
398
399 rcu_read_lock();
400 hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
401 (__force u32)spi) {
402 if (rsa->mode & IXGBE_RXTXMOD_VF)
403 continue;
404 if (spi == rsa->xs->id.spi &&
405 ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
406 (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
407 sizeof(rsa->xs->id.daddr.a6)))) &&
408 proto == rsa->xs->id.proto) {
409 ret = rsa->xs;
410 xfrm_state_hold(ret);
411 break;
412 }
413 }
414 rcu_read_unlock();
415 return ret;
416 }
417
418 /**
419 * ixgbe_ipsec_parse_proto_keys - find the key and salt based on the protocol
420 * @dev: pointer to net device
421 * @xs: pointer to xfrm_state struct
422 * @mykey: pointer to key array to populate
423 * @mysalt: pointer to salt value to populate
424 *
425 * This copies the protocol keys and salt to our own data tables. The
426 * 82599 family only supports the one algorithm.
427 **/
ixgbe_ipsec_parse_proto_keys(struct net_device * dev,struct xfrm_state * xs,u32 * mykey,u32 * mysalt)428 static int ixgbe_ipsec_parse_proto_keys(struct net_device *dev,
429 struct xfrm_state *xs,
430 u32 *mykey, u32 *mysalt)
431 {
432 unsigned char *key_data;
433 char *alg_name = NULL;
434 int key_len;
435
436 if (!xs->aead) {
437 netdev_err(dev, "Unsupported IPsec algorithm\n");
438 return -EINVAL;
439 }
440
441 if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
442 netdev_err(dev, "IPsec offload requires %d bit authentication\n",
443 IXGBE_IPSEC_AUTH_BITS);
444 return -EINVAL;
445 }
446
447 key_data = &xs->aead->alg_key[0];
448 key_len = xs->aead->alg_key_len;
449 alg_name = xs->aead->alg_name;
450
451 if (strcmp(alg_name, aes_gcm_name)) {
452 netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
453 aes_gcm_name);
454 return -EINVAL;
455 }
456
457 /* The key bytes come down in a bigendian array of bytes, so
458 * we don't need to do any byteswapping.
459 * 160 accounts for 16 byte key and 4 byte salt
460 */
461 if (key_len == IXGBE_IPSEC_KEY_BITS) {
462 *mysalt = ((u32 *)key_data)[4];
463 } else if (key_len != (IXGBE_IPSEC_KEY_BITS - (sizeof(*mysalt) * 8))) {
464 netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
465 return -EINVAL;
466 } else {
467 netdev_info(dev, "IPsec hw offload parameters missing 32 bit salt value\n");
468 *mysalt = 0;
469 }
470 memcpy(mykey, key_data, 16);
471
472 return 0;
473 }
474
475 /**
476 * ixgbe_ipsec_check_mgmt_ip - make sure there is no clash with mgmt IP filters
477 * @dev: pointer to net device
478 * @xs: pointer to transformer state struct
479 **/
ixgbe_ipsec_check_mgmt_ip(struct net_device * dev,struct xfrm_state * xs)480 static int ixgbe_ipsec_check_mgmt_ip(struct net_device *dev,
481 struct xfrm_state *xs)
482 {
483 struct ixgbe_adapter *adapter = ixgbe_from_netdev(dev);
484 struct ixgbe_hw *hw = &adapter->hw;
485 u32 mfval, manc, reg;
486 int num_filters = 4;
487 bool manc_ipv4;
488 u32 bmcipval;
489 int i, j;
490
491 #define MANC_EN_IPV4_FILTER BIT(24)
492 #define MFVAL_IPV4_FILTER_SHIFT 16
493 #define MFVAL_IPV6_FILTER_SHIFT 24
494 #define MIPAF_ARR(_m, _n) (IXGBE_MIPAF + ((_m) * 0x10) + ((_n) * 4))
495
496 #define IXGBE_BMCIP(_n) (0x5050 + ((_n) * 4))
497 #define IXGBE_BMCIPVAL 0x5060
498 #define BMCIP_V4 0x2
499 #define BMCIP_V6 0x3
500 #define BMCIP_MASK 0x3
501
502 manc = IXGBE_READ_REG(hw, IXGBE_MANC);
503 manc_ipv4 = !!(manc & MANC_EN_IPV4_FILTER);
504 mfval = IXGBE_READ_REG(hw, IXGBE_MFVAL);
505 bmcipval = IXGBE_READ_REG(hw, IXGBE_BMCIPVAL);
506
507 if (xs->props.family == AF_INET) {
508 /* are there any IPv4 filters to check? */
509 if (manc_ipv4) {
510 /* the 4 ipv4 filters are all in MIPAF(3, i) */
511 for (i = 0; i < num_filters; i++) {
512 if (!(mfval & BIT(MFVAL_IPV4_FILTER_SHIFT + i)))
513 continue;
514
515 reg = IXGBE_READ_REG(hw, MIPAF_ARR(3, i));
516 if (reg == (__force u32)xs->id.daddr.a4)
517 return 1;
518 }
519 }
520
521 if ((bmcipval & BMCIP_MASK) == BMCIP_V4) {
522 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(3));
523 if (reg == (__force u32)xs->id.daddr.a4)
524 return 1;
525 }
526
527 } else {
528 /* if there are ipv4 filters, they are in the last ipv6 slot */
529 if (manc_ipv4)
530 num_filters = 3;
531
532 for (i = 0; i < num_filters; i++) {
533 if (!(mfval & BIT(MFVAL_IPV6_FILTER_SHIFT + i)))
534 continue;
535
536 for (j = 0; j < 4; j++) {
537 reg = IXGBE_READ_REG(hw, MIPAF_ARR(i, j));
538 if (reg != (__force u32)xs->id.daddr.a6[j])
539 break;
540 }
541 if (j == 4) /* did we match all 4 words? */
542 return 1;
543 }
544
545 if ((bmcipval & BMCIP_MASK) == BMCIP_V6) {
546 for (j = 0; j < 4; j++) {
547 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(j));
548 if (reg != (__force u32)xs->id.daddr.a6[j])
549 break;
550 }
551 if (j == 4) /* did we match all 4 words? */
552 return 1;
553 }
554 }
555
556 return 0;
557 }
558
559 /**
560 * ixgbe_ipsec_add_sa - program device with a security association
561 * @dev: pointer to device to program
562 * @xs: pointer to transformer state struct
563 * @extack: extack point to fill failure reason
564 **/
ixgbe_ipsec_add_sa(struct net_device * dev,struct xfrm_state * xs,struct netlink_ext_ack * extack)565 static int ixgbe_ipsec_add_sa(struct net_device *dev,
566 struct xfrm_state *xs,
567 struct netlink_ext_ack *extack)
568 {
569 struct ixgbe_adapter *adapter = ixgbe_from_netdev(dev);
570 struct ixgbe_ipsec *ipsec = adapter->ipsec;
571 struct ixgbe_hw *hw = &adapter->hw;
572 int checked, match, first;
573 u16 sa_idx;
574 int ret;
575 int i;
576
577 if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
578 NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol for ipsec offload");
579 return -EINVAL;
580 }
581
582 if (xs->props.mode != XFRM_MODE_TRANSPORT) {
583 NL_SET_ERR_MSG_MOD(extack, "Unsupported mode for ipsec offload");
584 return -EINVAL;
585 }
586
587 if (ixgbe_ipsec_check_mgmt_ip(dev, xs)) {
588 NL_SET_ERR_MSG_MOD(extack, "IPsec IP addr clash with mgmt filters");
589 return -EINVAL;
590 }
591
592 if (xs->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
593 NL_SET_ERR_MSG_MOD(extack, "Unsupported ipsec offload type");
594 return -EINVAL;
595 }
596
597 if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
598 struct rx_sa rsa;
599
600 if (xs->calg) {
601 NL_SET_ERR_MSG_MOD(extack, "Compression offload not supported");
602 return -EINVAL;
603 }
604
605 /* find the first unused index */
606 ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
607 if (ret < 0) {
608 NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx table!");
609 return ret;
610 }
611 sa_idx = (u16)ret;
612
613 memset(&rsa, 0, sizeof(rsa));
614 rsa.used = true;
615 rsa.xs = xs;
616
617 if (rsa.xs->id.proto & IPPROTO_ESP)
618 rsa.decrypt = xs->ealg || xs->aead;
619
620 /* get the key and salt */
621 ret = ixgbe_ipsec_parse_proto_keys(dev, xs, rsa.key, &rsa.salt);
622 if (ret) {
623 NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Rx SA table");
624 return ret;
625 }
626
627 /* get ip for rx sa table */
628 if (xs->props.family == AF_INET6)
629 memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
630 else
631 memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
632
633 /* The HW does not have a 1:1 mapping from keys to IP addrs, so
634 * check for a matching IP addr entry in the table. If the addr
635 * already exists, use it; else find an unused slot and add the
636 * addr. If one does not exist and there are no unused table
637 * entries, fail the request.
638 */
639
640 /* Find an existing match or first not used, and stop looking
641 * after we've checked all we know we have.
642 */
643 checked = 0;
644 match = -1;
645 first = -1;
646 for (i = 0;
647 i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
648 (checked < ipsec->num_rx_sa || first < 0);
649 i++) {
650 if (ipsec->ip_tbl[i].used) {
651 if (!memcmp(ipsec->ip_tbl[i].ipaddr,
652 rsa.ipaddr, sizeof(rsa.ipaddr))) {
653 match = i;
654 break;
655 }
656 checked++;
657 } else if (first < 0) {
658 first = i; /* track the first empty seen */
659 }
660 }
661
662 if (ipsec->num_rx_sa == 0)
663 first = 0;
664
665 if (match >= 0) {
666 /* addrs are the same, we should use this one */
667 rsa.iptbl_ind = match;
668 ipsec->ip_tbl[match].ref_cnt++;
669
670 } else if (first >= 0) {
671 /* no matches, but here's an empty slot */
672 rsa.iptbl_ind = first;
673
674 memcpy(ipsec->ip_tbl[first].ipaddr,
675 rsa.ipaddr, sizeof(rsa.ipaddr));
676 ipsec->ip_tbl[first].ref_cnt = 1;
677 ipsec->ip_tbl[first].used = true;
678
679 ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
680
681 } else {
682 /* no match and no empty slot */
683 NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx IP SA table");
684 memset(&rsa, 0, sizeof(rsa));
685 return -ENOSPC;
686 }
687
688 rsa.mode = IXGBE_RXMOD_VALID;
689 if (rsa.xs->id.proto & IPPROTO_ESP)
690 rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
691 if (rsa.decrypt)
692 rsa.mode |= IXGBE_RXMOD_DECRYPT;
693 if (rsa.xs->props.family == AF_INET6)
694 rsa.mode |= IXGBE_RXMOD_IPV6;
695
696 /* the preparations worked, so save the info */
697 memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
698
699 ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
700 rsa.salt, rsa.mode, rsa.iptbl_ind);
701 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
702
703 ipsec->num_rx_sa++;
704
705 /* hash the new entry for faster search in Rx path */
706 hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
707 (__force u32)rsa.xs->id.spi);
708 } else {
709 struct tx_sa tsa;
710
711 if (adapter->num_vfs &&
712 adapter->bridge_mode != BRIDGE_MODE_VEPA)
713 return -EOPNOTSUPP;
714
715 /* find the first unused index */
716 ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
717 if (ret < 0) {
718 NL_SET_ERR_MSG_MOD(extack, "No space for SA in Tx table");
719 return ret;
720 }
721 sa_idx = (u16)ret;
722
723 memset(&tsa, 0, sizeof(tsa));
724 tsa.used = true;
725 tsa.xs = xs;
726
727 if (xs->id.proto & IPPROTO_ESP)
728 tsa.encrypt = xs->ealg || xs->aead;
729
730 ret = ixgbe_ipsec_parse_proto_keys(dev, xs, tsa.key, &tsa.salt);
731 if (ret) {
732 NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Tx SA table");
733 memset(&tsa, 0, sizeof(tsa));
734 return ret;
735 }
736
737 /* the preparations worked, so save the info */
738 memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
739
740 ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
741
742 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
743
744 ipsec->num_tx_sa++;
745 }
746
747 /* enable the engine if not already warmed up */
748 if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
749 ixgbe_ipsec_start_engine(adapter);
750 adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
751 }
752
753 return 0;
754 }
755
756 /**
757 * ixgbe_ipsec_del_sa - clear out this specific SA
758 * @dev: pointer to device to program
759 * @xs: pointer to transformer state struct
760 **/
ixgbe_ipsec_del_sa(struct net_device * dev,struct xfrm_state * xs)761 static void ixgbe_ipsec_del_sa(struct net_device *dev, struct xfrm_state *xs)
762 {
763 struct ixgbe_adapter *adapter = ixgbe_from_netdev(dev);
764 struct ixgbe_ipsec *ipsec = adapter->ipsec;
765 struct ixgbe_hw *hw = &adapter->hw;
766 u32 zerobuf[4] = {0, 0, 0, 0};
767 u16 sa_idx;
768
769 if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
770 struct rx_sa *rsa;
771 u8 ipi;
772
773 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
774 rsa = &ipsec->rx_tbl[sa_idx];
775
776 if (!rsa->used) {
777 netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
778 sa_idx, xs->xso.offload_handle);
779 return;
780 }
781
782 ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
783 hash_del_rcu(&rsa->hlist);
784
785 /* if the IP table entry is referenced by only this SA,
786 * i.e. ref_cnt is only 1, clear the IP table entry as well
787 */
788 ipi = rsa->iptbl_ind;
789 if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
790 ipsec->ip_tbl[ipi].ref_cnt--;
791
792 if (!ipsec->ip_tbl[ipi].ref_cnt) {
793 memset(&ipsec->ip_tbl[ipi], 0,
794 sizeof(struct rx_ip_sa));
795 ixgbe_ipsec_set_rx_ip(hw, ipi,
796 (__force __be32 *)zerobuf);
797 }
798 }
799
800 memset(rsa, 0, sizeof(struct rx_sa));
801 ipsec->num_rx_sa--;
802 } else {
803 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
804
805 if (!ipsec->tx_tbl[sa_idx].used) {
806 netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
807 sa_idx, xs->xso.offload_handle);
808 return;
809 }
810
811 ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
812 memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
813 ipsec->num_tx_sa--;
814 }
815
816 /* if there are no SAs left, stop the engine to save energy */
817 if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
818 adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
819 ixgbe_ipsec_stop_engine(adapter);
820 }
821 }
822
823 static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
824 .xdo_dev_state_add = ixgbe_ipsec_add_sa,
825 .xdo_dev_state_delete = ixgbe_ipsec_del_sa,
826 };
827
828 /**
829 * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
830 * @adapter: board private structure
831 * @vf: VF id to be removed
832 **/
ixgbe_ipsec_vf_clear(struct ixgbe_adapter * adapter,u32 vf)833 void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
834 {
835 struct ixgbe_ipsec *ipsec = adapter->ipsec;
836 int i;
837
838 if (!ipsec)
839 return;
840
841 /* search rx sa table */
842 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
843 if (!ipsec->rx_tbl[i].used)
844 continue;
845 if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
846 ipsec->rx_tbl[i].vf == vf)
847 ixgbe_ipsec_del_sa(adapter->netdev,
848 ipsec->rx_tbl[i].xs);
849 }
850
851 /* search tx sa table */
852 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
853 if (!ipsec->tx_tbl[i].used)
854 continue;
855 if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
856 ipsec->tx_tbl[i].vf == vf)
857 ixgbe_ipsec_del_sa(adapter->netdev,
858 ipsec->tx_tbl[i].xs);
859 }
860 }
861
862 /**
863 * ixgbe_ipsec_vf_add_sa - translate VF request to SA add
864 * @adapter: board private structure
865 * @msgbuf: The message buffer
866 * @vf: the VF index
867 *
868 * Make up a new xs and algorithm info from the data sent by the VF.
869 * We only need to sketch in just enough to set up the HW offload.
870 * Put the resulting offload_handle into the return message to the VF.
871 *
872 * Returns 0 or error value
873 **/
ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter * adapter,u32 * msgbuf,u32 vf)874 int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
875 {
876 struct ixgbe_ipsec *ipsec = adapter->ipsec;
877 struct xfrm_algo_desc *algo;
878 struct sa_mbx_msg *sam;
879 struct xfrm_state *xs;
880 size_t aead_len;
881 u16 sa_idx;
882 u32 pfsa;
883 int err;
884
885 sam = (struct sa_mbx_msg *)(&msgbuf[1]);
886 if (!adapter->vfinfo[vf].trusted ||
887 !(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
888 e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
889 err = -EACCES;
890 goto err_out;
891 }
892
893 /* Tx IPsec offload doesn't seem to work on this
894 * device, so block these requests for now.
895 */
896 if (sam->dir != XFRM_DEV_OFFLOAD_IN) {
897 err = -EOPNOTSUPP;
898 goto err_out;
899 }
900
901 algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
902 if (unlikely(!algo)) {
903 err = -ENOENT;
904 goto err_out;
905 }
906
907 xs = kzalloc(sizeof(*xs), GFP_ATOMIC);
908 if (unlikely(!xs)) {
909 err = -ENOMEM;
910 goto err_out;
911 }
912
913 xs->xso.dir = sam->dir;
914 xs->id.spi = sam->spi;
915 xs->id.proto = sam->proto;
916 xs->props.family = sam->family;
917 if (xs->props.family == AF_INET6)
918 memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
919 else
920 memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
921 xs->xso.dev = adapter->netdev;
922
923 aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
924 xs->aead = kzalloc(aead_len, GFP_ATOMIC);
925 if (unlikely(!xs->aead)) {
926 err = -ENOMEM;
927 goto err_xs;
928 }
929
930 xs->props.ealgo = algo->desc.sadb_alg_id;
931 xs->geniv = algo->uinfo.aead.geniv;
932 xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
933 xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
934 memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
935 memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
936
937 /* set up the HW offload */
938 err = ixgbe_ipsec_add_sa(adapter->netdev, xs, NULL);
939 if (err)
940 goto err_aead;
941
942 pfsa = xs->xso.offload_handle;
943 if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
944 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
945 ipsec->rx_tbl[sa_idx].vf = vf;
946 ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
947 } else {
948 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
949 ipsec->tx_tbl[sa_idx].vf = vf;
950 ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
951 }
952
953 msgbuf[1] = xs->xso.offload_handle;
954
955 return 0;
956
957 err_aead:
958 kfree_sensitive(xs->aead);
959 err_xs:
960 kfree_sensitive(xs);
961 err_out:
962 msgbuf[1] = err;
963 return err;
964 }
965
966 /**
967 * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
968 * @adapter: board private structure
969 * @msgbuf: The message buffer
970 * @vf: the VF index
971 *
972 * Given the offload_handle sent by the VF, look for the related SA table
973 * entry and use its xs field to call for a delete of the SA.
974 *
975 * Note: We silently ignore requests to delete entries that are already
976 * set to unused because when a VF is set to "DOWN", the PF first
977 * gets a reset and clears all the VF's entries; then the VF's
978 * XFRM stack sends individual deletes for each entry, which the
979 * reset already removed. In the future it might be good to try to
980 * optimize this so not so many unnecessary delete messages are sent.
981 *
982 * Returns 0 or error value
983 **/
ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter * adapter,u32 * msgbuf,u32 vf)984 int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
985 {
986 struct ixgbe_ipsec *ipsec = adapter->ipsec;
987 struct xfrm_state *xs;
988 u32 pfsa = msgbuf[1];
989 u16 sa_idx;
990
991 if (!adapter->vfinfo[vf].trusted) {
992 e_err(drv, "vf %d attempted to delete an SA\n", vf);
993 return -EPERM;
994 }
995
996 if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
997 struct rx_sa *rsa;
998
999 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1000 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1001 e_err(drv, "vf %d SA index %d out of range\n",
1002 vf, sa_idx);
1003 return -EINVAL;
1004 }
1005
1006 rsa = &ipsec->rx_tbl[sa_idx];
1007
1008 if (!rsa->used)
1009 return 0;
1010
1011 if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1012 rsa->vf != vf) {
1013 e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1014 return -ENOENT;
1015 }
1016
1017 xs = ipsec->rx_tbl[sa_idx].xs;
1018 } else {
1019 struct tx_sa *tsa;
1020
1021 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1022 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1023 e_err(drv, "vf %d SA index %d out of range\n",
1024 vf, sa_idx);
1025 return -EINVAL;
1026 }
1027
1028 tsa = &ipsec->tx_tbl[sa_idx];
1029
1030 if (!tsa->used)
1031 return 0;
1032
1033 if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1034 tsa->vf != vf) {
1035 e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1036 return -ENOENT;
1037 }
1038
1039 xs = ipsec->tx_tbl[sa_idx].xs;
1040 }
1041
1042 ixgbe_ipsec_del_sa(adapter->netdev, xs);
1043
1044 /* remove the xs that was made-up in the add request */
1045 kfree_sensitive(xs);
1046
1047 return 0;
1048 }
1049
1050 /**
1051 * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1052 * @tx_ring: outgoing context
1053 * @first: current data packet
1054 * @itd: ipsec Tx data for later use in building context descriptor
1055 **/
ixgbe_ipsec_tx(struct ixgbe_ring * tx_ring,struct ixgbe_tx_buffer * first,struct ixgbe_ipsec_tx_data * itd)1056 int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1057 struct ixgbe_tx_buffer *first,
1058 struct ixgbe_ipsec_tx_data *itd)
1059 {
1060 struct ixgbe_adapter *adapter = ixgbe_from_netdev(tx_ring->netdev);
1061 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1062 struct xfrm_state *xs;
1063 struct sec_path *sp;
1064 struct tx_sa *tsa;
1065
1066 sp = skb_sec_path(first->skb);
1067 if (unlikely(!sp->len)) {
1068 netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1069 __func__, sp->len);
1070 return 0;
1071 }
1072
1073 xs = xfrm_input_state(first->skb);
1074 if (unlikely(!xs)) {
1075 netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1076 __func__, xs);
1077 return 0;
1078 }
1079
1080 itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1081 if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1082 netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1083 __func__, itd->sa_idx, xs->xso.offload_handle);
1084 return 0;
1085 }
1086
1087 tsa = &ipsec->tx_tbl[itd->sa_idx];
1088 if (unlikely(!tsa->used)) {
1089 netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1090 __func__, itd->sa_idx);
1091 return 0;
1092 }
1093
1094 first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1095
1096 if (xs->id.proto == IPPROTO_ESP) {
1097
1098 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1099 IXGBE_ADVTXD_TUCMD_L4T_TCP;
1100 if (first->protocol == htons(ETH_P_IP))
1101 itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1102
1103 /* The actual trailer length is authlen (16 bytes) plus
1104 * 2 bytes for the proto and the padlen values, plus
1105 * padlen bytes of padding. This ends up not the same
1106 * as the static value found in xs->props.trailer_len (21).
1107 *
1108 * ... but if we're doing GSO, don't bother as the stack
1109 * doesn't add a trailer for those.
1110 */
1111 if (!skb_is_gso(first->skb)) {
1112 /* The "correct" way to get the auth length would be
1113 * to use
1114 * authlen = crypto_aead_authsize(xs->data);
1115 * but since we know we only have one size to worry
1116 * about * we can let the compiler use the constant
1117 * and save us a few CPU cycles.
1118 */
1119 const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1120 struct sk_buff *skb = first->skb;
1121 u8 padlen;
1122 int ret;
1123
1124 ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1125 &padlen, 1);
1126 if (unlikely(ret))
1127 return 0;
1128 itd->trailer_len = authlen + 2 + padlen;
1129 }
1130 }
1131 if (tsa->encrypt)
1132 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1133
1134 return 1;
1135 }
1136
1137 /**
1138 * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1139 * @rx_ring: receiving ring
1140 * @rx_desc: receive data descriptor
1141 * @skb: current data packet
1142 *
1143 * Determine if there was an ipsec encapsulation noticed, and if so set up
1144 * the resulting status for later in the receive stack.
1145 **/
ixgbe_ipsec_rx(struct ixgbe_ring * rx_ring,union ixgbe_adv_rx_desc * rx_desc,struct sk_buff * skb)1146 void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1147 union ixgbe_adv_rx_desc *rx_desc,
1148 struct sk_buff *skb)
1149 {
1150 struct ixgbe_adapter *adapter = ixgbe_from_netdev(rx_ring->netdev);
1151 __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1152 __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1153 IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1154 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1155 struct xfrm_offload *xo = NULL;
1156 struct xfrm_state *xs = NULL;
1157 struct ipv6hdr *ip6 = NULL;
1158 struct iphdr *ip4 = NULL;
1159 struct sec_path *sp;
1160 void *daddr;
1161 __be32 spi;
1162 u8 *c_hdr;
1163 u8 proto;
1164
1165 /* Find the ip and crypto headers in the data.
1166 * We can assume no vlan header in the way, b/c the
1167 * hw won't recognize the IPsec packet and anyway the
1168 * currently vlan device doesn't support xfrm offload.
1169 */
1170 if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
1171 ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
1172 daddr = &ip4->daddr;
1173 c_hdr = (u8 *)ip4 + ip4->ihl * 4;
1174 } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
1175 ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
1176 daddr = &ip6->daddr;
1177 c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
1178 } else {
1179 return;
1180 }
1181
1182 switch (pkt_info & ipsec_pkt_types) {
1183 case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
1184 spi = ((struct ip_auth_hdr *)c_hdr)->spi;
1185 proto = IPPROTO_AH;
1186 break;
1187 case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
1188 spi = ((struct ip_esp_hdr *)c_hdr)->spi;
1189 proto = IPPROTO_ESP;
1190 break;
1191 default:
1192 return;
1193 }
1194
1195 xs = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
1196 if (unlikely(!xs))
1197 return;
1198
1199 sp = secpath_set(skb);
1200 if (unlikely(!sp))
1201 return;
1202
1203 sp->xvec[sp->len++] = xs;
1204 sp->olen++;
1205 xo = xfrm_offload(skb);
1206 xo->flags = CRYPTO_DONE;
1207 xo->status = CRYPTO_SUCCESS;
1208
1209 adapter->rx_ipsec++;
1210 }
1211
1212 /**
1213 * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
1214 * @adapter: board private structure
1215 **/
ixgbe_init_ipsec_offload(struct ixgbe_adapter * adapter)1216 void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
1217 {
1218 struct ixgbe_hw *hw = &adapter->hw;
1219 struct ixgbe_ipsec *ipsec;
1220 u32 t_dis, r_dis;
1221 size_t size;
1222
1223 if (hw->mac.type == ixgbe_mac_82598EB)
1224 return;
1225
1226 /* If there is no support for either Tx or Rx offload
1227 * we should not be advertising support for IPsec.
1228 */
1229 t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
1230 IXGBE_SECTXSTAT_SECTX_OFF_DIS;
1231 r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
1232 IXGBE_SECRXSTAT_SECRX_OFF_DIS;
1233 if (t_dis || r_dis)
1234 return;
1235
1236 ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
1237 if (!ipsec)
1238 goto err1;
1239 hash_init(ipsec->rx_sa_list);
1240
1241 size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1242 ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
1243 if (!ipsec->rx_tbl)
1244 goto err2;
1245
1246 size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1247 ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
1248 if (!ipsec->tx_tbl)
1249 goto err2;
1250
1251 size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
1252 ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
1253 if (!ipsec->ip_tbl)
1254 goto err2;
1255
1256 ipsec->num_rx_sa = 0;
1257 ipsec->num_tx_sa = 0;
1258
1259 adapter->ipsec = ipsec;
1260 ixgbe_ipsec_stop_engine(adapter);
1261 ixgbe_ipsec_clear_hw_tables(adapter);
1262
1263 adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
1264
1265 return;
1266
1267 err2:
1268 kfree(ipsec->ip_tbl);
1269 kfree(ipsec->rx_tbl);
1270 kfree(ipsec->tx_tbl);
1271 kfree(ipsec);
1272 err1:
1273 netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
1274 }
1275
1276 /**
1277 * ixgbe_stop_ipsec_offload - tear down the ipsec offload
1278 * @adapter: board private structure
1279 **/
ixgbe_stop_ipsec_offload(struct ixgbe_adapter * adapter)1280 void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
1281 {
1282 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1283
1284 adapter->ipsec = NULL;
1285 if (ipsec) {
1286 kfree(ipsec->ip_tbl);
1287 kfree(ipsec->rx_tbl);
1288 kfree(ipsec->tx_tbl);
1289 kfree(ipsec);
1290 }
1291 }
1292