xref: /linux/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c (revision b82779648dfd3814df4e381f086326ec70fd791f)
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 == (__force u32)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 == (__force u32)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 != (__force u32)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 != (__force u32)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  * @extack: extack point to fill failure reason
561  **/
ixgbe_ipsec_add_sa(struct xfrm_state * xs,struct netlink_ext_ack * extack)562 static int ixgbe_ipsec_add_sa(struct xfrm_state *xs,
563 			      struct netlink_ext_ack *extack)
564 {
565 	struct net_device *dev = xs->xso.real_dev;
566 	struct ixgbe_adapter *adapter = netdev_priv(dev);
567 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
568 	struct ixgbe_hw *hw = &adapter->hw;
569 	int checked, match, first;
570 	u16 sa_idx;
571 	int ret;
572 	int i;
573 
574 	if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
575 		NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol for ipsec offload");
576 		return -EINVAL;
577 	}
578 
579 	if (xs->props.mode != XFRM_MODE_TRANSPORT) {
580 		NL_SET_ERR_MSG_MOD(extack, "Unsupported mode for ipsec offload");
581 		return -EINVAL;
582 	}
583 
584 	if (ixgbe_ipsec_check_mgmt_ip(xs)) {
585 		NL_SET_ERR_MSG_MOD(extack, "IPsec IP addr clash with mgmt filters");
586 		return -EINVAL;
587 	}
588 
589 	if (xs->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
590 		NL_SET_ERR_MSG_MOD(extack, "Unsupported ipsec offload type");
591 		return -EINVAL;
592 	}
593 
594 	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
595 		struct rx_sa rsa;
596 
597 		if (xs->calg) {
598 			NL_SET_ERR_MSG_MOD(extack, "Compression offload not supported");
599 			return -EINVAL;
600 		}
601 
602 		/* find the first unused index */
603 		ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
604 		if (ret < 0) {
605 			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx table!");
606 			return ret;
607 		}
608 		sa_idx = (u16)ret;
609 
610 		memset(&rsa, 0, sizeof(rsa));
611 		rsa.used = true;
612 		rsa.xs = xs;
613 
614 		if (rsa.xs->id.proto & IPPROTO_ESP)
615 			rsa.decrypt = xs->ealg || xs->aead;
616 
617 		/* get the key and salt */
618 		ret = ixgbe_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
619 		if (ret) {
620 			NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Rx SA table");
621 			return ret;
622 		}
623 
624 		/* get ip for rx sa table */
625 		if (xs->props.family == AF_INET6)
626 			memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
627 		else
628 			memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
629 
630 		/* The HW does not have a 1:1 mapping from keys to IP addrs, so
631 		 * check for a matching IP addr entry in the table.  If the addr
632 		 * already exists, use it; else find an unused slot and add the
633 		 * addr.  If one does not exist and there are no unused table
634 		 * entries, fail the request.
635 		 */
636 
637 		/* Find an existing match or first not used, and stop looking
638 		 * after we've checked all we know we have.
639 		 */
640 		checked = 0;
641 		match = -1;
642 		first = -1;
643 		for (i = 0;
644 		     i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
645 		     (checked < ipsec->num_rx_sa || first < 0);
646 		     i++) {
647 			if (ipsec->ip_tbl[i].used) {
648 				if (!memcmp(ipsec->ip_tbl[i].ipaddr,
649 					    rsa.ipaddr, sizeof(rsa.ipaddr))) {
650 					match = i;
651 					break;
652 				}
653 				checked++;
654 			} else if (first < 0) {
655 				first = i;  /* track the first empty seen */
656 			}
657 		}
658 
659 		if (ipsec->num_rx_sa == 0)
660 			first = 0;
661 
662 		if (match >= 0) {
663 			/* addrs are the same, we should use this one */
664 			rsa.iptbl_ind = match;
665 			ipsec->ip_tbl[match].ref_cnt++;
666 
667 		} else if (first >= 0) {
668 			/* no matches, but here's an empty slot */
669 			rsa.iptbl_ind = first;
670 
671 			memcpy(ipsec->ip_tbl[first].ipaddr,
672 			       rsa.ipaddr, sizeof(rsa.ipaddr));
673 			ipsec->ip_tbl[first].ref_cnt = 1;
674 			ipsec->ip_tbl[first].used = true;
675 
676 			ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
677 
678 		} else {
679 			/* no match and no empty slot */
680 			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx IP SA table");
681 			memset(&rsa, 0, sizeof(rsa));
682 			return -ENOSPC;
683 		}
684 
685 		rsa.mode = IXGBE_RXMOD_VALID;
686 		if (rsa.xs->id.proto & IPPROTO_ESP)
687 			rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
688 		if (rsa.decrypt)
689 			rsa.mode |= IXGBE_RXMOD_DECRYPT;
690 		if (rsa.xs->props.family == AF_INET6)
691 			rsa.mode |= IXGBE_RXMOD_IPV6;
692 
693 		/* the preparations worked, so save the info */
694 		memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
695 
696 		ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
697 				      rsa.salt, rsa.mode, rsa.iptbl_ind);
698 		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
699 
700 		ipsec->num_rx_sa++;
701 
702 		/* hash the new entry for faster search in Rx path */
703 		hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
704 			     (__force u32)rsa.xs->id.spi);
705 	} else {
706 		struct tx_sa tsa;
707 
708 		if (adapter->num_vfs &&
709 		    adapter->bridge_mode != BRIDGE_MODE_VEPA)
710 			return -EOPNOTSUPP;
711 
712 		/* find the first unused index */
713 		ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
714 		if (ret < 0) {
715 			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Tx table");
716 			return ret;
717 		}
718 		sa_idx = (u16)ret;
719 
720 		memset(&tsa, 0, sizeof(tsa));
721 		tsa.used = true;
722 		tsa.xs = xs;
723 
724 		if (xs->id.proto & IPPROTO_ESP)
725 			tsa.encrypt = xs->ealg || xs->aead;
726 
727 		ret = ixgbe_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
728 		if (ret) {
729 			NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Tx SA table");
730 			memset(&tsa, 0, sizeof(tsa));
731 			return ret;
732 		}
733 
734 		/* the preparations worked, so save the info */
735 		memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
736 
737 		ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
738 
739 		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
740 
741 		ipsec->num_tx_sa++;
742 	}
743 
744 	/* enable the engine if not already warmed up */
745 	if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
746 		ixgbe_ipsec_start_engine(adapter);
747 		adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
748 	}
749 
750 	return 0;
751 }
752 
753 /**
754  * ixgbe_ipsec_del_sa - clear out this specific SA
755  * @xs: pointer to transformer state struct
756  **/
ixgbe_ipsec_del_sa(struct xfrm_state * xs)757 static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
758 {
759 	struct net_device *dev = xs->xso.real_dev;
760 	struct ixgbe_adapter *adapter = netdev_priv(dev);
761 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
762 	struct ixgbe_hw *hw = &adapter->hw;
763 	u32 zerobuf[4] = {0, 0, 0, 0};
764 	u16 sa_idx;
765 
766 	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
767 		struct rx_sa *rsa;
768 		u8 ipi;
769 
770 		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
771 		rsa = &ipsec->rx_tbl[sa_idx];
772 
773 		if (!rsa->used) {
774 			netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
775 				   sa_idx, xs->xso.offload_handle);
776 			return;
777 		}
778 
779 		ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
780 		hash_del_rcu(&rsa->hlist);
781 
782 		/* if the IP table entry is referenced by only this SA,
783 		 * i.e. ref_cnt is only 1, clear the IP table entry as well
784 		 */
785 		ipi = rsa->iptbl_ind;
786 		if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
787 			ipsec->ip_tbl[ipi].ref_cnt--;
788 
789 			if (!ipsec->ip_tbl[ipi].ref_cnt) {
790 				memset(&ipsec->ip_tbl[ipi], 0,
791 				       sizeof(struct rx_ip_sa));
792 				ixgbe_ipsec_set_rx_ip(hw, ipi,
793 						      (__force __be32 *)zerobuf);
794 			}
795 		}
796 
797 		memset(rsa, 0, sizeof(struct rx_sa));
798 		ipsec->num_rx_sa--;
799 	} else {
800 		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
801 
802 		if (!ipsec->tx_tbl[sa_idx].used) {
803 			netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
804 				   sa_idx, xs->xso.offload_handle);
805 			return;
806 		}
807 
808 		ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
809 		memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
810 		ipsec->num_tx_sa--;
811 	}
812 
813 	/* if there are no SAs left, stop the engine to save energy */
814 	if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
815 		adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
816 		ixgbe_ipsec_stop_engine(adapter);
817 	}
818 }
819 
820 /**
821  * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
822  * @skb: current data packet
823  * @xs: pointer to transformer state struct
824  **/
ixgbe_ipsec_offload_ok(struct sk_buff * skb,struct xfrm_state * xs)825 static bool ixgbe_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
826 {
827 	if (xs->props.family == AF_INET) {
828 		/* Offload with IPv4 options is not supported yet */
829 		if (ip_hdr(skb)->ihl != 5)
830 			return false;
831 	} else {
832 		/* Offload with IPv6 extension headers is not support yet */
833 		if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
834 			return false;
835 	}
836 
837 	return true;
838 }
839 
840 static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
841 	.xdo_dev_state_add = ixgbe_ipsec_add_sa,
842 	.xdo_dev_state_delete = ixgbe_ipsec_del_sa,
843 	.xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
844 };
845 
846 /**
847  * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
848  * @adapter: board private structure
849  * @vf: VF id to be removed
850  **/
ixgbe_ipsec_vf_clear(struct ixgbe_adapter * adapter,u32 vf)851 void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
852 {
853 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
854 	int i;
855 
856 	if (!ipsec)
857 		return;
858 
859 	/* search rx sa table */
860 	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
861 		if (!ipsec->rx_tbl[i].used)
862 			continue;
863 		if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
864 		    ipsec->rx_tbl[i].vf == vf)
865 			ixgbe_ipsec_del_sa(ipsec->rx_tbl[i].xs);
866 	}
867 
868 	/* search tx sa table */
869 	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
870 		if (!ipsec->tx_tbl[i].used)
871 			continue;
872 		if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
873 		    ipsec->tx_tbl[i].vf == vf)
874 			ixgbe_ipsec_del_sa(ipsec->tx_tbl[i].xs);
875 	}
876 }
877 
878 /**
879  * ixgbe_ipsec_vf_add_sa - translate VF request to SA add
880  * @adapter: board private structure
881  * @msgbuf: The message buffer
882  * @vf: the VF index
883  *
884  * Make up a new xs and algorithm info from the data sent by the VF.
885  * We only need to sketch in just enough to set up the HW offload.
886  * Put the resulting offload_handle into the return message to the VF.
887  *
888  * Returns 0 or error value
889  **/
ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter * adapter,u32 * msgbuf,u32 vf)890 int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
891 {
892 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
893 	struct xfrm_algo_desc *algo;
894 	struct sa_mbx_msg *sam;
895 	struct xfrm_state *xs;
896 	size_t aead_len;
897 	u16 sa_idx;
898 	u32 pfsa;
899 	int err;
900 
901 	sam = (struct sa_mbx_msg *)(&msgbuf[1]);
902 	if (!adapter->vfinfo[vf].trusted ||
903 	    !(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
904 		e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
905 		err = -EACCES;
906 		goto err_out;
907 	}
908 
909 	/* Tx IPsec offload doesn't seem to work on this
910 	 * device, so block these requests for now.
911 	 */
912 	if (sam->dir != XFRM_DEV_OFFLOAD_IN) {
913 		err = -EOPNOTSUPP;
914 		goto err_out;
915 	}
916 
917 	algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
918 	if (unlikely(!algo)) {
919 		err = -ENOENT;
920 		goto err_out;
921 	}
922 
923 	xs = kzalloc(sizeof(*xs), GFP_ATOMIC);
924 	if (unlikely(!xs)) {
925 		err = -ENOMEM;
926 		goto err_out;
927 	}
928 
929 	xs->xso.dir = sam->dir;
930 	xs->id.spi = sam->spi;
931 	xs->id.proto = sam->proto;
932 	xs->props.family = sam->family;
933 	if (xs->props.family == AF_INET6)
934 		memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
935 	else
936 		memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
937 	xs->xso.dev = adapter->netdev;
938 
939 	aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
940 	xs->aead = kzalloc(aead_len, GFP_ATOMIC);
941 	if (unlikely(!xs->aead)) {
942 		err = -ENOMEM;
943 		goto err_xs;
944 	}
945 
946 	xs->props.ealgo = algo->desc.sadb_alg_id;
947 	xs->geniv = algo->uinfo.aead.geniv;
948 	xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
949 	xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
950 	memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
951 	memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
952 
953 	/* set up the HW offload */
954 	err = ixgbe_ipsec_add_sa(xs, NULL);
955 	if (err)
956 		goto err_aead;
957 
958 	pfsa = xs->xso.offload_handle;
959 	if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
960 		sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
961 		ipsec->rx_tbl[sa_idx].vf = vf;
962 		ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
963 	} else {
964 		sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
965 		ipsec->tx_tbl[sa_idx].vf = vf;
966 		ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
967 	}
968 
969 	msgbuf[1] = xs->xso.offload_handle;
970 
971 	return 0;
972 
973 err_aead:
974 	kfree_sensitive(xs->aead);
975 err_xs:
976 	kfree_sensitive(xs);
977 err_out:
978 	msgbuf[1] = err;
979 	return err;
980 }
981 
982 /**
983  * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
984  * @adapter: board private structure
985  * @msgbuf: The message buffer
986  * @vf: the VF index
987  *
988  * Given the offload_handle sent by the VF, look for the related SA table
989  * entry and use its xs field to call for a delete of the SA.
990  *
991  * Note: We silently ignore requests to delete entries that are already
992  *       set to unused because when a VF is set to "DOWN", the PF first
993  *       gets a reset and clears all the VF's entries; then the VF's
994  *       XFRM stack sends individual deletes for each entry, which the
995  *       reset already removed.  In the future it might be good to try to
996  *       optimize this so not so many unnecessary delete messages are sent.
997  *
998  * Returns 0 or error value
999  **/
ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter * adapter,u32 * msgbuf,u32 vf)1000 int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
1001 {
1002 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1003 	struct xfrm_state *xs;
1004 	u32 pfsa = msgbuf[1];
1005 	u16 sa_idx;
1006 
1007 	if (!adapter->vfinfo[vf].trusted) {
1008 		e_err(drv, "vf %d attempted to delete an SA\n", vf);
1009 		return -EPERM;
1010 	}
1011 
1012 	if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
1013 		struct rx_sa *rsa;
1014 
1015 		sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1016 		if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1017 			e_err(drv, "vf %d SA index %d out of range\n",
1018 			      vf, sa_idx);
1019 			return -EINVAL;
1020 		}
1021 
1022 		rsa = &ipsec->rx_tbl[sa_idx];
1023 
1024 		if (!rsa->used)
1025 			return 0;
1026 
1027 		if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1028 		    rsa->vf != vf) {
1029 			e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1030 			return -ENOENT;
1031 		}
1032 
1033 		xs = ipsec->rx_tbl[sa_idx].xs;
1034 	} else {
1035 		struct tx_sa *tsa;
1036 
1037 		sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1038 		if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1039 			e_err(drv, "vf %d SA index %d out of range\n",
1040 			      vf, sa_idx);
1041 			return -EINVAL;
1042 		}
1043 
1044 		tsa = &ipsec->tx_tbl[sa_idx];
1045 
1046 		if (!tsa->used)
1047 			return 0;
1048 
1049 		if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1050 		    tsa->vf != vf) {
1051 			e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1052 			return -ENOENT;
1053 		}
1054 
1055 		xs = ipsec->tx_tbl[sa_idx].xs;
1056 	}
1057 
1058 	ixgbe_ipsec_del_sa(xs);
1059 
1060 	/* remove the xs that was made-up in the add request */
1061 	kfree_sensitive(xs);
1062 
1063 	return 0;
1064 }
1065 
1066 /**
1067  * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1068  * @tx_ring: outgoing context
1069  * @first: current data packet
1070  * @itd: ipsec Tx data for later use in building context descriptor
1071  **/
ixgbe_ipsec_tx(struct ixgbe_ring * tx_ring,struct ixgbe_tx_buffer * first,struct ixgbe_ipsec_tx_data * itd)1072 int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1073 		   struct ixgbe_tx_buffer *first,
1074 		   struct ixgbe_ipsec_tx_data *itd)
1075 {
1076 	struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
1077 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1078 	struct xfrm_state *xs;
1079 	struct sec_path *sp;
1080 	struct tx_sa *tsa;
1081 
1082 	sp = skb_sec_path(first->skb);
1083 	if (unlikely(!sp->len)) {
1084 		netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1085 			   __func__, sp->len);
1086 		return 0;
1087 	}
1088 
1089 	xs = xfrm_input_state(first->skb);
1090 	if (unlikely(!xs)) {
1091 		netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1092 			   __func__, xs);
1093 		return 0;
1094 	}
1095 
1096 	itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1097 	if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1098 		netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1099 			   __func__, itd->sa_idx, xs->xso.offload_handle);
1100 		return 0;
1101 	}
1102 
1103 	tsa = &ipsec->tx_tbl[itd->sa_idx];
1104 	if (unlikely(!tsa->used)) {
1105 		netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1106 			   __func__, itd->sa_idx);
1107 		return 0;
1108 	}
1109 
1110 	first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1111 
1112 	if (xs->id.proto == IPPROTO_ESP) {
1113 
1114 		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1115 			      IXGBE_ADVTXD_TUCMD_L4T_TCP;
1116 		if (first->protocol == htons(ETH_P_IP))
1117 			itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1118 
1119 		/* The actual trailer length is authlen (16 bytes) plus
1120 		 * 2 bytes for the proto and the padlen values, plus
1121 		 * padlen bytes of padding.  This ends up not the same
1122 		 * as the static value found in xs->props.trailer_len (21).
1123 		 *
1124 		 * ... but if we're doing GSO, don't bother as the stack
1125 		 * doesn't add a trailer for those.
1126 		 */
1127 		if (!skb_is_gso(first->skb)) {
1128 			/* The "correct" way to get the auth length would be
1129 			 * to use
1130 			 *    authlen = crypto_aead_authsize(xs->data);
1131 			 * but since we know we only have one size to worry
1132 			 * about * we can let the compiler use the constant
1133 			 * and save us a few CPU cycles.
1134 			 */
1135 			const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1136 			struct sk_buff *skb = first->skb;
1137 			u8 padlen;
1138 			int ret;
1139 
1140 			ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1141 					    &padlen, 1);
1142 			if (unlikely(ret))
1143 				return 0;
1144 			itd->trailer_len = authlen + 2 + padlen;
1145 		}
1146 	}
1147 	if (tsa->encrypt)
1148 		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1149 
1150 	return 1;
1151 }
1152 
1153 /**
1154  * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1155  * @rx_ring: receiving ring
1156  * @rx_desc: receive data descriptor
1157  * @skb: current data packet
1158  *
1159  * Determine if there was an ipsec encapsulation noticed, and if so set up
1160  * the resulting status for later in the receive stack.
1161  **/
ixgbe_ipsec_rx(struct ixgbe_ring * rx_ring,union ixgbe_adv_rx_desc * rx_desc,struct sk_buff * skb)1162 void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1163 		    union ixgbe_adv_rx_desc *rx_desc,
1164 		    struct sk_buff *skb)
1165 {
1166 	struct ixgbe_adapter *adapter = netdev_priv(rx_ring->netdev);
1167 	__le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1168 	__le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1169 					     IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1170 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1171 	struct xfrm_offload *xo = NULL;
1172 	struct xfrm_state *xs = NULL;
1173 	struct ipv6hdr *ip6 = NULL;
1174 	struct iphdr *ip4 = NULL;
1175 	struct sec_path *sp;
1176 	void *daddr;
1177 	__be32 spi;
1178 	u8 *c_hdr;
1179 	u8 proto;
1180 
1181 	/* Find the ip and crypto headers in the data.
1182 	 * We can assume no vlan header in the way, b/c the
1183 	 * hw won't recognize the IPsec packet and anyway the
1184 	 * currently vlan device doesn't support xfrm offload.
1185 	 */
1186 	if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
1187 		ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
1188 		daddr = &ip4->daddr;
1189 		c_hdr = (u8 *)ip4 + ip4->ihl * 4;
1190 	} else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
1191 		ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
1192 		daddr = &ip6->daddr;
1193 		c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
1194 	} else {
1195 		return;
1196 	}
1197 
1198 	switch (pkt_info & ipsec_pkt_types) {
1199 	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
1200 		spi = ((struct ip_auth_hdr *)c_hdr)->spi;
1201 		proto = IPPROTO_AH;
1202 		break;
1203 	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
1204 		spi = ((struct ip_esp_hdr *)c_hdr)->spi;
1205 		proto = IPPROTO_ESP;
1206 		break;
1207 	default:
1208 		return;
1209 	}
1210 
1211 	xs = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
1212 	if (unlikely(!xs))
1213 		return;
1214 
1215 	sp = secpath_set(skb);
1216 	if (unlikely(!sp))
1217 		return;
1218 
1219 	sp->xvec[sp->len++] = xs;
1220 	sp->olen++;
1221 	xo = xfrm_offload(skb);
1222 	xo->flags = CRYPTO_DONE;
1223 	xo->status = CRYPTO_SUCCESS;
1224 
1225 	adapter->rx_ipsec++;
1226 }
1227 
1228 /**
1229  * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
1230  * @adapter: board private structure
1231  **/
ixgbe_init_ipsec_offload(struct ixgbe_adapter * adapter)1232 void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
1233 {
1234 	struct ixgbe_hw *hw = &adapter->hw;
1235 	struct ixgbe_ipsec *ipsec;
1236 	u32 t_dis, r_dis;
1237 	size_t size;
1238 
1239 	if (hw->mac.type == ixgbe_mac_82598EB)
1240 		return;
1241 
1242 	/* If there is no support for either Tx or Rx offload
1243 	 * we should not be advertising support for IPsec.
1244 	 */
1245 	t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
1246 		IXGBE_SECTXSTAT_SECTX_OFF_DIS;
1247 	r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
1248 		IXGBE_SECRXSTAT_SECRX_OFF_DIS;
1249 	if (t_dis || r_dis)
1250 		return;
1251 
1252 	ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
1253 	if (!ipsec)
1254 		goto err1;
1255 	hash_init(ipsec->rx_sa_list);
1256 
1257 	size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1258 	ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
1259 	if (!ipsec->rx_tbl)
1260 		goto err2;
1261 
1262 	size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1263 	ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
1264 	if (!ipsec->tx_tbl)
1265 		goto err2;
1266 
1267 	size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
1268 	ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
1269 	if (!ipsec->ip_tbl)
1270 		goto err2;
1271 
1272 	ipsec->num_rx_sa = 0;
1273 	ipsec->num_tx_sa = 0;
1274 
1275 	adapter->ipsec = ipsec;
1276 	ixgbe_ipsec_stop_engine(adapter);
1277 	ixgbe_ipsec_clear_hw_tables(adapter);
1278 
1279 	adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
1280 
1281 	return;
1282 
1283 err2:
1284 	kfree(ipsec->ip_tbl);
1285 	kfree(ipsec->rx_tbl);
1286 	kfree(ipsec->tx_tbl);
1287 	kfree(ipsec);
1288 err1:
1289 	netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
1290 }
1291 
1292 /**
1293  * ixgbe_stop_ipsec_offload - tear down the ipsec offload
1294  * @adapter: board private structure
1295  **/
ixgbe_stop_ipsec_offload(struct ixgbe_adapter * adapter)1296 void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
1297 {
1298 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1299 
1300 	adapter->ipsec = NULL;
1301 	if (ipsec) {
1302 		kfree(ipsec->ip_tbl);
1303 		kfree(ipsec->rx_tbl);
1304 		kfree(ipsec->tx_tbl);
1305 		kfree(ipsec);
1306 	}
1307 }
1308