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 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(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(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 * @xs: pointer to xfrm_state struct
421 * @mykey: pointer to key array to populate
422 * @mysalt: pointer to salt value to populate
423 *
424 * This copies the protocol keys and salt to our own data tables. The
425 * 82599 family only supports the one algorithm.
426 **/
ixgbe_ipsec_parse_proto_keys(struct xfrm_state * xs,u32 * mykey,u32 * mysalt)427 static int ixgbe_ipsec_parse_proto_keys(struct xfrm_state *xs,
428 u32 *mykey, u32 *mysalt)
429 {
430 struct net_device *dev = xs->xso.real_dev;
431 unsigned char *key_data;
432 char *alg_name = NULL;
433 int key_len;
434
435 if (!xs->aead) {
436 netdev_err(dev, "Unsupported IPsec algorithm\n");
437 return -EINVAL;
438 }
439
440 if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
441 netdev_err(dev, "IPsec offload requires %d bit authentication\n",
442 IXGBE_IPSEC_AUTH_BITS);
443 return -EINVAL;
444 }
445
446 key_data = &xs->aead->alg_key[0];
447 key_len = xs->aead->alg_key_len;
448 alg_name = xs->aead->alg_name;
449
450 if (strcmp(alg_name, aes_gcm_name)) {
451 netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
452 aes_gcm_name);
453 return -EINVAL;
454 }
455
456 /* The key bytes come down in a bigendian array of bytes, so
457 * we don't need to do any byteswapping.
458 * 160 accounts for 16 byte key and 4 byte salt
459 */
460 if (key_len == IXGBE_IPSEC_KEY_BITS) {
461 *mysalt = ((u32 *)key_data)[4];
462 } else if (key_len != (IXGBE_IPSEC_KEY_BITS - (sizeof(*mysalt) * 8))) {
463 netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
464 return -EINVAL;
465 } else {
466 netdev_info(dev, "IPsec hw offload parameters missing 32 bit salt value\n");
467 *mysalt = 0;
468 }
469 memcpy(mykey, key_data, 16);
470
471 return 0;
472 }
473
474 /**
475 * ixgbe_ipsec_check_mgmt_ip - make sure there is no clash with mgmt IP filters
476 * @xs: pointer to transformer state struct
477 **/
ixgbe_ipsec_check_mgmt_ip(struct xfrm_state * xs)478 static int ixgbe_ipsec_check_mgmt_ip(struct xfrm_state *xs)
479 {
480 struct net_device *dev = xs->xso.real_dev;
481 struct ixgbe_adapter *adapter = netdev_priv(dev);
482 struct ixgbe_hw *hw = &adapter->hw;
483 u32 mfval, manc, reg;
484 int num_filters = 4;
485 bool manc_ipv4;
486 u32 bmcipval;
487 int i, j;
488
489 #define MANC_EN_IPV4_FILTER BIT(24)
490 #define MFVAL_IPV4_FILTER_SHIFT 16
491 #define MFVAL_IPV6_FILTER_SHIFT 24
492 #define MIPAF_ARR(_m, _n) (IXGBE_MIPAF + ((_m) * 0x10) + ((_n) * 4))
493
494 #define IXGBE_BMCIP(_n) (0x5050 + ((_n) * 4))
495 #define IXGBE_BMCIPVAL 0x5060
496 #define BMCIP_V4 0x2
497 #define BMCIP_V6 0x3
498 #define BMCIP_MASK 0x3
499
500 manc = IXGBE_READ_REG(hw, IXGBE_MANC);
501 manc_ipv4 = !!(manc & MANC_EN_IPV4_FILTER);
502 mfval = IXGBE_READ_REG(hw, IXGBE_MFVAL);
503 bmcipval = IXGBE_READ_REG(hw, IXGBE_BMCIPVAL);
504
505 if (xs->props.family == AF_INET) {
506 /* are there any IPv4 filters to check? */
507 if (manc_ipv4) {
508 /* the 4 ipv4 filters are all in MIPAF(3, i) */
509 for (i = 0; i < num_filters; i++) {
510 if (!(mfval & BIT(MFVAL_IPV4_FILTER_SHIFT + i)))
511 continue;
512
513 reg = IXGBE_READ_REG(hw, MIPAF_ARR(3, i));
514 if (reg == xs->id.daddr.a4)
515 return 1;
516 }
517 }
518
519 if ((bmcipval & BMCIP_MASK) == BMCIP_V4) {
520 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(3));
521 if (reg == xs->id.daddr.a4)
522 return 1;
523 }
524
525 } else {
526 /* if there are ipv4 filters, they are in the last ipv6 slot */
527 if (manc_ipv4)
528 num_filters = 3;
529
530 for (i = 0; i < num_filters; i++) {
531 if (!(mfval & BIT(MFVAL_IPV6_FILTER_SHIFT + i)))
532 continue;
533
534 for (j = 0; j < 4; j++) {
535 reg = IXGBE_READ_REG(hw, MIPAF_ARR(i, j));
536 if (reg != xs->id.daddr.a6[j])
537 break;
538 }
539 if (j == 4) /* did we match all 4 words? */
540 return 1;
541 }
542
543 if ((bmcipval & BMCIP_MASK) == BMCIP_V6) {
544 for (j = 0; j < 4; j++) {
545 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(j));
546 if (reg != xs->id.daddr.a6[j])
547 break;
548 }
549 if (j == 4) /* did we match all 4 words? */
550 return 1;
551 }
552 }
553
554 return 0;
555 }
556
557 /**
558 * ixgbe_ipsec_add_sa - program device with a security association
559 * @xs: pointer to transformer state struct
560 **/
ixgbe_ipsec_add_sa(struct xfrm_state * xs)561 static int ixgbe_ipsec_add_sa(struct xfrm_state *xs)
562 {
563 struct net_device *dev = xs->xso.real_dev;
564 struct ixgbe_adapter *adapter = netdev_priv(dev);
565 struct ixgbe_ipsec *ipsec = adapter->ipsec;
566 struct ixgbe_hw *hw = &adapter->hw;
567 int checked, match, first;
568 u16 sa_idx;
569 int ret;
570 int i;
571
572 if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
573 netdev_err(dev, "Unsupported protocol 0x%04x for ipsec offload\n",
574 xs->id.proto);
575 return -EINVAL;
576 }
577
578 if (xs->props.mode != XFRM_MODE_TRANSPORT) {
579 netdev_err(dev, "Unsupported mode for ipsec offload\n");
580 return -EINVAL;
581 }
582
583 if (ixgbe_ipsec_check_mgmt_ip(xs)) {
584 netdev_err(dev, "IPsec IP addr clash with mgmt filters\n");
585 return -EINVAL;
586 }
587
588 if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
589 struct rx_sa rsa;
590
591 if (xs->calg) {
592 netdev_err(dev, "Compression offload not supported\n");
593 return -EINVAL;
594 }
595
596 /* find the first unused index */
597 ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
598 if (ret < 0) {
599 netdev_err(dev, "No space for SA in Rx table!\n");
600 return ret;
601 }
602 sa_idx = (u16)ret;
603
604 memset(&rsa, 0, sizeof(rsa));
605 rsa.used = true;
606 rsa.xs = xs;
607
608 if (rsa.xs->id.proto & IPPROTO_ESP)
609 rsa.decrypt = xs->ealg || xs->aead;
610
611 /* get the key and salt */
612 ret = ixgbe_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
613 if (ret) {
614 netdev_err(dev, "Failed to get key data for Rx SA table\n");
615 return ret;
616 }
617
618 /* get ip for rx sa table */
619 if (xs->props.family == AF_INET6)
620 memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
621 else
622 memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
623
624 /* The HW does not have a 1:1 mapping from keys to IP addrs, so
625 * check for a matching IP addr entry in the table. If the addr
626 * already exists, use it; else find an unused slot and add the
627 * addr. If one does not exist and there are no unused table
628 * entries, fail the request.
629 */
630
631 /* Find an existing match or first not used, and stop looking
632 * after we've checked all we know we have.
633 */
634 checked = 0;
635 match = -1;
636 first = -1;
637 for (i = 0;
638 i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
639 (checked < ipsec->num_rx_sa || first < 0);
640 i++) {
641 if (ipsec->ip_tbl[i].used) {
642 if (!memcmp(ipsec->ip_tbl[i].ipaddr,
643 rsa.ipaddr, sizeof(rsa.ipaddr))) {
644 match = i;
645 break;
646 }
647 checked++;
648 } else if (first < 0) {
649 first = i; /* track the first empty seen */
650 }
651 }
652
653 if (ipsec->num_rx_sa == 0)
654 first = 0;
655
656 if (match >= 0) {
657 /* addrs are the same, we should use this one */
658 rsa.iptbl_ind = match;
659 ipsec->ip_tbl[match].ref_cnt++;
660
661 } else if (first >= 0) {
662 /* no matches, but here's an empty slot */
663 rsa.iptbl_ind = first;
664
665 memcpy(ipsec->ip_tbl[first].ipaddr,
666 rsa.ipaddr, sizeof(rsa.ipaddr));
667 ipsec->ip_tbl[first].ref_cnt = 1;
668 ipsec->ip_tbl[first].used = true;
669
670 ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
671
672 } else {
673 /* no match and no empty slot */
674 netdev_err(dev, "No space for SA in Rx IP SA table\n");
675 memset(&rsa, 0, sizeof(rsa));
676 return -ENOSPC;
677 }
678
679 rsa.mode = IXGBE_RXMOD_VALID;
680 if (rsa.xs->id.proto & IPPROTO_ESP)
681 rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
682 if (rsa.decrypt)
683 rsa.mode |= IXGBE_RXMOD_DECRYPT;
684 if (rsa.xs->props.family == AF_INET6)
685 rsa.mode |= IXGBE_RXMOD_IPV6;
686
687 /* the preparations worked, so save the info */
688 memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
689
690 ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
691 rsa.salt, rsa.mode, rsa.iptbl_ind);
692 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
693
694 ipsec->num_rx_sa++;
695
696 /* hash the new entry for faster search in Rx path */
697 hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
698 (__force u32)rsa.xs->id.spi);
699 } else {
700 struct tx_sa tsa;
701
702 if (adapter->num_vfs &&
703 adapter->bridge_mode != BRIDGE_MODE_VEPA)
704 return -EOPNOTSUPP;
705
706 /* find the first unused index */
707 ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
708 if (ret < 0) {
709 netdev_err(dev, "No space for SA in Tx table\n");
710 return ret;
711 }
712 sa_idx = (u16)ret;
713
714 memset(&tsa, 0, sizeof(tsa));
715 tsa.used = true;
716 tsa.xs = xs;
717
718 if (xs->id.proto & IPPROTO_ESP)
719 tsa.encrypt = xs->ealg || xs->aead;
720
721 ret = ixgbe_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
722 if (ret) {
723 netdev_err(dev, "Failed to get key data for Tx SA table\n");
724 memset(&tsa, 0, sizeof(tsa));
725 return ret;
726 }
727
728 /* the preparations worked, so save the info */
729 memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
730
731 ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
732
733 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
734
735 ipsec->num_tx_sa++;
736 }
737
738 /* enable the engine if not already warmed up */
739 if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
740 ixgbe_ipsec_start_engine(adapter);
741 adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
742 }
743
744 return 0;
745 }
746
747 /**
748 * ixgbe_ipsec_del_sa - clear out this specific SA
749 * @xs: pointer to transformer state struct
750 **/
ixgbe_ipsec_del_sa(struct xfrm_state * xs)751 static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
752 {
753 struct net_device *dev = xs->xso.real_dev;
754 struct ixgbe_adapter *adapter = netdev_priv(dev);
755 struct ixgbe_ipsec *ipsec = adapter->ipsec;
756 struct ixgbe_hw *hw = &adapter->hw;
757 u32 zerobuf[4] = {0, 0, 0, 0};
758 u16 sa_idx;
759
760 if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
761 struct rx_sa *rsa;
762 u8 ipi;
763
764 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
765 rsa = &ipsec->rx_tbl[sa_idx];
766
767 if (!rsa->used) {
768 netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
769 sa_idx, xs->xso.offload_handle);
770 return;
771 }
772
773 ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
774 hash_del_rcu(&rsa->hlist);
775
776 /* if the IP table entry is referenced by only this SA,
777 * i.e. ref_cnt is only 1, clear the IP table entry as well
778 */
779 ipi = rsa->iptbl_ind;
780 if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
781 ipsec->ip_tbl[ipi].ref_cnt--;
782
783 if (!ipsec->ip_tbl[ipi].ref_cnt) {
784 memset(&ipsec->ip_tbl[ipi], 0,
785 sizeof(struct rx_ip_sa));
786 ixgbe_ipsec_set_rx_ip(hw, ipi,
787 (__force __be32 *)zerobuf);
788 }
789 }
790
791 memset(rsa, 0, sizeof(struct rx_sa));
792 ipsec->num_rx_sa--;
793 } else {
794 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
795
796 if (!ipsec->tx_tbl[sa_idx].used) {
797 netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
798 sa_idx, xs->xso.offload_handle);
799 return;
800 }
801
802 ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
803 memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
804 ipsec->num_tx_sa--;
805 }
806
807 /* if there are no SAs left, stop the engine to save energy */
808 if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
809 adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
810 ixgbe_ipsec_stop_engine(adapter);
811 }
812 }
813
814 /**
815 * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
816 * @skb: current data packet
817 * @xs: pointer to transformer state struct
818 **/
ixgbe_ipsec_offload_ok(struct sk_buff * skb,struct xfrm_state * xs)819 static bool ixgbe_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
820 {
821 if (xs->props.family == AF_INET) {
822 /* Offload with IPv4 options is not supported yet */
823 if (ip_hdr(skb)->ihl != 5)
824 return false;
825 } else {
826 /* Offload with IPv6 extension headers is not support yet */
827 if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
828 return false;
829 }
830
831 return true;
832 }
833
834 static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
835 .xdo_dev_state_add = ixgbe_ipsec_add_sa,
836 .xdo_dev_state_delete = ixgbe_ipsec_del_sa,
837 .xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
838 };
839
840 /**
841 * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
842 * @adapter: board private structure
843 * @vf: VF id to be removed
844 **/
ixgbe_ipsec_vf_clear(struct ixgbe_adapter * adapter,u32 vf)845 void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
846 {
847 struct ixgbe_ipsec *ipsec = adapter->ipsec;
848 int i;
849
850 if (!ipsec)
851 return;
852
853 /* search rx sa table */
854 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
855 if (!ipsec->rx_tbl[i].used)
856 continue;
857 if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
858 ipsec->rx_tbl[i].vf == vf)
859 ixgbe_ipsec_del_sa(ipsec->rx_tbl[i].xs);
860 }
861
862 /* search tx sa table */
863 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
864 if (!ipsec->tx_tbl[i].used)
865 continue;
866 if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
867 ipsec->tx_tbl[i].vf == vf)
868 ixgbe_ipsec_del_sa(ipsec->tx_tbl[i].xs);
869 }
870 }
871
872 /**
873 * ixgbe_ipsec_vf_add_sa - translate VF request to SA add
874 * @adapter: board private structure
875 * @msgbuf: The message buffer
876 * @vf: the VF index
877 *
878 * Make up a new xs and algorithm info from the data sent by the VF.
879 * We only need to sketch in just enough to set up the HW offload.
880 * Put the resulting offload_handle into the return message to the VF.
881 *
882 * Returns 0 or error value
883 **/
ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter * adapter,u32 * msgbuf,u32 vf)884 int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
885 {
886 struct ixgbe_ipsec *ipsec = adapter->ipsec;
887 struct xfrm_algo_desc *algo;
888 struct sa_mbx_msg *sam;
889 struct xfrm_state *xs;
890 size_t aead_len;
891 u16 sa_idx;
892 u32 pfsa;
893 int err;
894
895 sam = (struct sa_mbx_msg *)(&msgbuf[1]);
896 if (!adapter->vfinfo[vf].trusted ||
897 !(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
898 e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
899 err = -EACCES;
900 goto err_out;
901 }
902
903 /* Tx IPsec offload doesn't seem to work on this
904 * device, so block these requests for now.
905 */
906 sam->flags = sam->flags & ~XFRM_OFFLOAD_IPV6;
907 if (sam->flags != XFRM_OFFLOAD_INBOUND) {
908 err = -EOPNOTSUPP;
909 goto err_out;
910 }
911
912 xs = kzalloc(sizeof(*xs), GFP_KERNEL);
913 if (unlikely(!xs)) {
914 err = -ENOMEM;
915 goto err_out;
916 }
917
918 xs->xso.flags = sam->flags;
919 xs->id.spi = sam->spi;
920 xs->id.proto = sam->proto;
921 xs->props.family = sam->family;
922 if (xs->props.family == AF_INET6)
923 memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
924 else
925 memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
926 xs->xso.dev = adapter->netdev;
927
928 algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
929 if (unlikely(!algo)) {
930 err = -ENOENT;
931 goto err_xs;
932 }
933
934 aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
935 xs->aead = kzalloc(aead_len, GFP_KERNEL);
936 if (unlikely(!xs->aead)) {
937 err = -ENOMEM;
938 goto err_xs;
939 }
940
941 xs->props.ealgo = algo->desc.sadb_alg_id;
942 xs->geniv = algo->uinfo.aead.geniv;
943 xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
944 xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
945 memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
946 memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
947
948 /* set up the HW offload */
949 err = ixgbe_ipsec_add_sa(xs);
950 if (err)
951 goto err_aead;
952
953 pfsa = xs->xso.offload_handle;
954 if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
955 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
956 ipsec->rx_tbl[sa_idx].vf = vf;
957 ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
958 } else {
959 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
960 ipsec->tx_tbl[sa_idx].vf = vf;
961 ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
962 }
963
964 msgbuf[1] = xs->xso.offload_handle;
965
966 return 0;
967
968 err_aead:
969 kfree_sensitive(xs->aead);
970 err_xs:
971 kfree_sensitive(xs);
972 err_out:
973 msgbuf[1] = err;
974 return err;
975 }
976
977 /**
978 * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
979 * @adapter: board private structure
980 * @msgbuf: The message buffer
981 * @vf: the VF index
982 *
983 * Given the offload_handle sent by the VF, look for the related SA table
984 * entry and use its xs field to call for a delete of the SA.
985 *
986 * Note: We silently ignore requests to delete entries that are already
987 * set to unused because when a VF is set to "DOWN", the PF first
988 * gets a reset and clears all the VF's entries; then the VF's
989 * XFRM stack sends individual deletes for each entry, which the
990 * reset already removed. In the future it might be good to try to
991 * optimize this so not so many unnecessary delete messages are sent.
992 *
993 * Returns 0 or error value
994 **/
ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter * adapter,u32 * msgbuf,u32 vf)995 int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
996 {
997 struct ixgbe_ipsec *ipsec = adapter->ipsec;
998 struct xfrm_state *xs;
999 u32 pfsa = msgbuf[1];
1000 u16 sa_idx;
1001
1002 if (!adapter->vfinfo[vf].trusted) {
1003 e_err(drv, "vf %d attempted to delete an SA\n", vf);
1004 return -EPERM;
1005 }
1006
1007 if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
1008 struct rx_sa *rsa;
1009
1010 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1011 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1012 e_err(drv, "vf %d SA index %d out of range\n",
1013 vf, sa_idx);
1014 return -EINVAL;
1015 }
1016
1017 rsa = &ipsec->rx_tbl[sa_idx];
1018
1019 if (!rsa->used)
1020 return 0;
1021
1022 if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1023 rsa->vf != vf) {
1024 e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1025 return -ENOENT;
1026 }
1027
1028 xs = ipsec->rx_tbl[sa_idx].xs;
1029 } else {
1030 struct tx_sa *tsa;
1031
1032 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1033 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1034 e_err(drv, "vf %d SA index %d out of range\n",
1035 vf, sa_idx);
1036 return -EINVAL;
1037 }
1038
1039 tsa = &ipsec->tx_tbl[sa_idx];
1040
1041 if (!tsa->used)
1042 return 0;
1043
1044 if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1045 tsa->vf != vf) {
1046 e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1047 return -ENOENT;
1048 }
1049
1050 xs = ipsec->tx_tbl[sa_idx].xs;
1051 }
1052
1053 ixgbe_ipsec_del_sa(xs);
1054
1055 /* remove the xs that was made-up in the add request */
1056 kfree_sensitive(xs);
1057
1058 return 0;
1059 }
1060
1061 /**
1062 * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1063 * @tx_ring: outgoing context
1064 * @first: current data packet
1065 * @itd: ipsec Tx data for later use in building context descriptor
1066 **/
ixgbe_ipsec_tx(struct ixgbe_ring * tx_ring,struct ixgbe_tx_buffer * first,struct ixgbe_ipsec_tx_data * itd)1067 int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1068 struct ixgbe_tx_buffer *first,
1069 struct ixgbe_ipsec_tx_data *itd)
1070 {
1071 struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
1072 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1073 struct xfrm_state *xs;
1074 struct sec_path *sp;
1075 struct tx_sa *tsa;
1076
1077 sp = skb_sec_path(first->skb);
1078 if (unlikely(!sp->len)) {
1079 netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1080 __func__, sp->len);
1081 return 0;
1082 }
1083
1084 xs = xfrm_input_state(first->skb);
1085 if (unlikely(!xs)) {
1086 netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1087 __func__, xs);
1088 return 0;
1089 }
1090
1091 itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1092 if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1093 netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1094 __func__, itd->sa_idx, xs->xso.offload_handle);
1095 return 0;
1096 }
1097
1098 tsa = &ipsec->tx_tbl[itd->sa_idx];
1099 if (unlikely(!tsa->used)) {
1100 netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1101 __func__, itd->sa_idx);
1102 return 0;
1103 }
1104
1105 first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1106
1107 if (xs->id.proto == IPPROTO_ESP) {
1108
1109 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1110 IXGBE_ADVTXD_TUCMD_L4T_TCP;
1111 if (first->protocol == htons(ETH_P_IP))
1112 itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1113
1114 /* The actual trailer length is authlen (16 bytes) plus
1115 * 2 bytes for the proto and the padlen values, plus
1116 * padlen bytes of padding. This ends up not the same
1117 * as the static value found in xs->props.trailer_len (21).
1118 *
1119 * ... but if we're doing GSO, don't bother as the stack
1120 * doesn't add a trailer for those.
1121 */
1122 if (!skb_is_gso(first->skb)) {
1123 /* The "correct" way to get the auth length would be
1124 * to use
1125 * authlen = crypto_aead_authsize(xs->data);
1126 * but since we know we only have one size to worry
1127 * about * we can let the compiler use the constant
1128 * and save us a few CPU cycles.
1129 */
1130 const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1131 struct sk_buff *skb = first->skb;
1132 u8 padlen;
1133 int ret;
1134
1135 ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1136 &padlen, 1);
1137 if (unlikely(ret))
1138 return 0;
1139 itd->trailer_len = authlen + 2 + padlen;
1140 }
1141 }
1142 if (tsa->encrypt)
1143 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1144
1145 return 1;
1146 }
1147
1148 /**
1149 * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1150 * @rx_ring: receiving ring
1151 * @rx_desc: receive data descriptor
1152 * @skb: current data packet
1153 *
1154 * Determine if there was an ipsec encapsulation noticed, and if so set up
1155 * the resulting status for later in the receive stack.
1156 **/
ixgbe_ipsec_rx(struct ixgbe_ring * rx_ring,union ixgbe_adv_rx_desc * rx_desc,struct sk_buff * skb)1157 void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1158 union ixgbe_adv_rx_desc *rx_desc,
1159 struct sk_buff *skb)
1160 {
1161 struct ixgbe_adapter *adapter = netdev_priv(rx_ring->netdev);
1162 __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1163 __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1164 IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1165 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1166 struct xfrm_offload *xo = NULL;
1167 struct xfrm_state *xs = NULL;
1168 struct ipv6hdr *ip6 = NULL;
1169 struct iphdr *ip4 = NULL;
1170 struct sec_path *sp;
1171 void *daddr;
1172 __be32 spi;
1173 u8 *c_hdr;
1174 u8 proto;
1175
1176 /* Find the ip and crypto headers in the data.
1177 * We can assume no vlan header in the way, b/c the
1178 * hw won't recognize the IPsec packet and anyway the
1179 * currently vlan device doesn't support xfrm offload.
1180 */
1181 if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
1182 ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
1183 daddr = &ip4->daddr;
1184 c_hdr = (u8 *)ip4 + ip4->ihl * 4;
1185 } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
1186 ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
1187 daddr = &ip6->daddr;
1188 c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
1189 } else {
1190 return;
1191 }
1192
1193 switch (pkt_info & ipsec_pkt_types) {
1194 case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
1195 spi = ((struct ip_auth_hdr *)c_hdr)->spi;
1196 proto = IPPROTO_AH;
1197 break;
1198 case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
1199 spi = ((struct ip_esp_hdr *)c_hdr)->spi;
1200 proto = IPPROTO_ESP;
1201 break;
1202 default:
1203 return;
1204 }
1205
1206 xs = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
1207 if (unlikely(!xs))
1208 return;
1209
1210 sp = secpath_set(skb);
1211 if (unlikely(!sp))
1212 return;
1213
1214 sp->xvec[sp->len++] = xs;
1215 sp->olen++;
1216 xo = xfrm_offload(skb);
1217 xo->flags = CRYPTO_DONE;
1218 xo->status = CRYPTO_SUCCESS;
1219
1220 adapter->rx_ipsec++;
1221 }
1222
1223 /**
1224 * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
1225 * @adapter: board private structure
1226 **/
ixgbe_init_ipsec_offload(struct ixgbe_adapter * adapter)1227 void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
1228 {
1229 struct ixgbe_hw *hw = &adapter->hw;
1230 struct ixgbe_ipsec *ipsec;
1231 u32 t_dis, r_dis;
1232 size_t size;
1233
1234 if (hw->mac.type == ixgbe_mac_82598EB)
1235 return;
1236
1237 /* If there is no support for either Tx or Rx offload
1238 * we should not be advertising support for IPsec.
1239 */
1240 t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
1241 IXGBE_SECTXSTAT_SECTX_OFF_DIS;
1242 r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
1243 IXGBE_SECRXSTAT_SECRX_OFF_DIS;
1244 if (t_dis || r_dis)
1245 return;
1246
1247 ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
1248 if (!ipsec)
1249 goto err1;
1250 hash_init(ipsec->rx_sa_list);
1251
1252 size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1253 ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
1254 if (!ipsec->rx_tbl)
1255 goto err2;
1256
1257 size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1258 ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
1259 if (!ipsec->tx_tbl)
1260 goto err2;
1261
1262 size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
1263 ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
1264 if (!ipsec->ip_tbl)
1265 goto err2;
1266
1267 ipsec->num_rx_sa = 0;
1268 ipsec->num_tx_sa = 0;
1269
1270 adapter->ipsec = ipsec;
1271 ixgbe_ipsec_stop_engine(adapter);
1272 ixgbe_ipsec_clear_hw_tables(adapter);
1273
1274 adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
1275
1276 return;
1277
1278 err2:
1279 kfree(ipsec->ip_tbl);
1280 kfree(ipsec->rx_tbl);
1281 kfree(ipsec->tx_tbl);
1282 kfree(ipsec);
1283 err1:
1284 netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
1285 }
1286
1287 /**
1288 * ixgbe_stop_ipsec_offload - tear down the ipsec offload
1289 * @adapter: board private structure
1290 **/
ixgbe_stop_ipsec_offload(struct ixgbe_adapter * adapter)1291 void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
1292 {
1293 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1294
1295 adapter->ipsec = NULL;
1296 if (ipsec) {
1297 kfree(ipsec->ip_tbl);
1298 kfree(ipsec->rx_tbl);
1299 kfree(ipsec->tx_tbl);
1300 kfree(ipsec);
1301 }
1302 }
1303