1 /*
2  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
3  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *	- Redistributions of source code must retain the above
16  *	  copyright notice, this list of conditions and the following
17  *	  disclaimer.
18  *
19  *	- Redistributions in binary form must reproduce the above
20  *	  copyright notice, this list of conditions and the following
21  *	  disclaimer in the documentation and/or other materials
22  *	  provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33 
34 #include <linux/skbuff.h>
35 
36 #include "rxe.h"
37 #include "rxe_loc.h"
38 
39 static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
40 			    struct rxe_qp *qp)
41 {
42 	if (unlikely(!qp->valid))
43 		goto err1;
44 
45 	switch (qp_type(qp)) {
46 	case IB_QPT_RC:
47 		if (unlikely((pkt->opcode & IB_OPCODE_RC) != 0)) {
48 			pr_warn_ratelimited("bad qp type\n");
49 			goto err1;
50 		}
51 		break;
52 	case IB_QPT_UC:
53 		if (unlikely(!(pkt->opcode & IB_OPCODE_UC))) {
54 			pr_warn_ratelimited("bad qp type\n");
55 			goto err1;
56 		}
57 		break;
58 	case IB_QPT_UD:
59 	case IB_QPT_SMI:
60 	case IB_QPT_GSI:
61 		if (unlikely(!(pkt->opcode & IB_OPCODE_UD))) {
62 			pr_warn_ratelimited("bad qp type\n");
63 			goto err1;
64 		}
65 		break;
66 	default:
67 		pr_warn_ratelimited("unsupported qp type\n");
68 		goto err1;
69 	}
70 
71 	if (pkt->mask & RXE_REQ_MASK) {
72 		if (unlikely(qp->resp.state != QP_STATE_READY))
73 			goto err1;
74 	} else if (unlikely(qp->req.state < QP_STATE_READY ||
75 				qp->req.state > QP_STATE_DRAINED)) {
76 		goto err1;
77 	}
78 
79 	return 0;
80 
81 err1:
82 	return -EINVAL;
83 }
84 
85 static void set_bad_pkey_cntr(struct rxe_port *port)
86 {
87 	spin_lock_bh(&port->port_lock);
88 	port->attr.bad_pkey_cntr = min((u32)0xffff,
89 				       port->attr.bad_pkey_cntr + 1);
90 	spin_unlock_bh(&port->port_lock);
91 }
92 
93 static void set_qkey_viol_cntr(struct rxe_port *port)
94 {
95 	spin_lock_bh(&port->port_lock);
96 	port->attr.qkey_viol_cntr = min((u32)0xffff,
97 					port->attr.qkey_viol_cntr + 1);
98 	spin_unlock_bh(&port->port_lock);
99 }
100 
101 static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
102 		      u32 qpn, struct rxe_qp *qp)
103 {
104 	int i;
105 	int found_pkey = 0;
106 	struct rxe_port *port = &rxe->port;
107 	u16 pkey = bth_pkey(pkt);
108 
109 	pkt->pkey_index = 0;
110 
111 	if (qpn == 1) {
112 		for (i = 0; i < port->attr.pkey_tbl_len; i++) {
113 			if (pkey_match(pkey, port->pkey_tbl[i])) {
114 				pkt->pkey_index = i;
115 				found_pkey = 1;
116 				break;
117 			}
118 		}
119 
120 		if (!found_pkey) {
121 			pr_warn_ratelimited("bad pkey = 0x%x\n", pkey);
122 			set_bad_pkey_cntr(port);
123 			goto err1;
124 		}
125 	} else if (qpn != 0) {
126 		if (unlikely(!pkey_match(pkey,
127 					 port->pkey_tbl[qp->attr.pkey_index]
128 					))) {
129 			pr_warn_ratelimited("bad pkey = 0x%0x\n", pkey);
130 			set_bad_pkey_cntr(port);
131 			goto err1;
132 		}
133 		pkt->pkey_index = qp->attr.pkey_index;
134 	}
135 
136 	if ((qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) &&
137 	    qpn != 0 && pkt->mask) {
138 		u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;
139 
140 		if (unlikely(deth_qkey(pkt) != qkey)) {
141 			pr_warn_ratelimited("bad qkey, got 0x%x expected 0x%x for qpn 0x%x\n",
142 					    deth_qkey(pkt), qkey, qpn);
143 			set_qkey_viol_cntr(port);
144 			goto err1;
145 		}
146 	}
147 
148 	return 0;
149 
150 err1:
151 	return -EINVAL;
152 }
153 
154 static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
155 		      struct rxe_qp *qp)
156 {
157 	struct sk_buff *skb = PKT_TO_SKB(pkt);
158 
159 	if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC)
160 		goto done;
161 
162 	if (unlikely(pkt->port_num != qp->attr.port_num)) {
163 		pr_warn_ratelimited("port %d != qp port %d\n",
164 				    pkt->port_num, qp->attr.port_num);
165 		goto err1;
166 	}
167 
168 	if (skb->protocol == htons(ETH_P_IP)) {
169 		struct in_addr *saddr =
170 			&qp->pri_av.sgid_addr._sockaddr_in.sin_addr;
171 		struct in_addr *daddr =
172 			&qp->pri_av.dgid_addr._sockaddr_in.sin_addr;
173 
174 		if (ip_hdr(skb)->daddr != saddr->s_addr) {
175 			pr_warn_ratelimited("dst addr %pI4 != qp source addr %pI4\n",
176 					    &ip_hdr(skb)->daddr,
177 					    &saddr->s_addr);
178 			goto err1;
179 		}
180 
181 		if (ip_hdr(skb)->saddr != daddr->s_addr) {
182 			pr_warn_ratelimited("source addr %pI4 != qp dst addr %pI4\n",
183 					    &ip_hdr(skb)->saddr,
184 					    &daddr->s_addr);
185 			goto err1;
186 		}
187 
188 	} else if (skb->protocol == htons(ETH_P_IPV6)) {
189 		struct in6_addr *saddr =
190 			&qp->pri_av.sgid_addr._sockaddr_in6.sin6_addr;
191 		struct in6_addr *daddr =
192 			&qp->pri_av.dgid_addr._sockaddr_in6.sin6_addr;
193 
194 		if (memcmp(&ipv6_hdr(skb)->daddr, saddr, sizeof(*saddr))) {
195 			pr_warn_ratelimited("dst addr %pI6 != qp source addr %pI6\n",
196 					    &ipv6_hdr(skb)->daddr, saddr);
197 			goto err1;
198 		}
199 
200 		if (memcmp(&ipv6_hdr(skb)->saddr, daddr, sizeof(*daddr))) {
201 			pr_warn_ratelimited("source addr %pI6 != qp dst addr %pI6\n",
202 					    &ipv6_hdr(skb)->saddr, daddr);
203 			goto err1;
204 		}
205 	}
206 
207 done:
208 	return 0;
209 
210 err1:
211 	return -EINVAL;
212 }
213 
214 static int hdr_check(struct rxe_pkt_info *pkt)
215 {
216 	struct rxe_dev *rxe = pkt->rxe;
217 	struct rxe_port *port = &rxe->port;
218 	struct rxe_qp *qp = NULL;
219 	u32 qpn = bth_qpn(pkt);
220 	int index;
221 	int err;
222 
223 	if (unlikely(bth_tver(pkt) != BTH_TVER)) {
224 		pr_warn_ratelimited("bad tver\n");
225 		goto err1;
226 	}
227 
228 	if (qpn != IB_MULTICAST_QPN) {
229 		index = (qpn == 0) ? port->qp_smi_index :
230 			((qpn == 1) ? port->qp_gsi_index : qpn);
231 		qp = rxe_pool_get_index(&rxe->qp_pool, index);
232 		if (unlikely(!qp)) {
233 			pr_warn_ratelimited("no qp matches qpn 0x%x\n", qpn);
234 			goto err1;
235 		}
236 
237 		err = check_type_state(rxe, pkt, qp);
238 		if (unlikely(err))
239 			goto err2;
240 
241 		err = check_addr(rxe, pkt, qp);
242 		if (unlikely(err))
243 			goto err2;
244 
245 		err = check_keys(rxe, pkt, qpn, qp);
246 		if (unlikely(err))
247 			goto err2;
248 	} else {
249 		if (unlikely((pkt->mask & RXE_GRH_MASK) == 0)) {
250 			pr_warn_ratelimited("no grh for mcast qpn\n");
251 			goto err1;
252 		}
253 	}
254 
255 	pkt->qp = qp;
256 	return 0;
257 
258 err2:
259 	if (qp)
260 		rxe_drop_ref(qp);
261 err1:
262 	return -EINVAL;
263 }
264 
265 static inline void rxe_rcv_pkt(struct rxe_dev *rxe,
266 			       struct rxe_pkt_info *pkt,
267 			       struct sk_buff *skb)
268 {
269 	if (pkt->mask & RXE_REQ_MASK)
270 		rxe_resp_queue_pkt(rxe, pkt->qp, skb);
271 	else
272 		rxe_comp_queue_pkt(rxe, pkt->qp, skb);
273 }
274 
275 static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
276 {
277 	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
278 	struct rxe_mc_grp *mcg;
279 	struct sk_buff *skb_copy;
280 	struct rxe_mc_elem *mce;
281 	struct rxe_qp *qp;
282 	union ib_gid dgid;
283 	int err;
284 
285 	if (skb->protocol == htons(ETH_P_IP))
286 		ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
287 				       (struct in6_addr *)&dgid);
288 	else if (skb->protocol == htons(ETH_P_IPV6))
289 		memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));
290 
291 	/* lookup mcast group corresponding to mgid, takes a ref */
292 	mcg = rxe_pool_get_key(&rxe->mc_grp_pool, &dgid);
293 	if (!mcg)
294 		goto err1;	/* mcast group not registered */
295 
296 	spin_lock_bh(&mcg->mcg_lock);
297 
298 	list_for_each_entry(mce, &mcg->qp_list, qp_list) {
299 		qp = mce->qp;
300 		pkt = SKB_TO_PKT(skb);
301 
302 		/* validate qp for incoming packet */
303 		err = check_type_state(rxe, pkt, qp);
304 		if (err)
305 			continue;
306 
307 		err = check_keys(rxe, pkt, bth_qpn(pkt), qp);
308 		if (err)
309 			continue;
310 
311 		/* if *not* the last qp in the list
312 		 * make a copy of the skb to post to the next qp
313 		 */
314 		skb_copy = (mce->qp_list.next != &mcg->qp_list) ?
315 				skb_clone(skb, GFP_ATOMIC) : NULL;
316 
317 		pkt->qp = qp;
318 		rxe_add_ref(qp);
319 		rxe_rcv_pkt(rxe, pkt, skb);
320 
321 		skb = skb_copy;
322 		if (!skb)
323 			break;
324 	}
325 
326 	spin_unlock_bh(&mcg->mcg_lock);
327 
328 	rxe_drop_ref(mcg);	/* drop ref from rxe_pool_get_key. */
329 
330 err1:
331 	if (skb)
332 		kfree_skb(skb);
333 }
334 
335 static int rxe_match_dgid(struct rxe_dev *rxe, struct sk_buff *skb)
336 {
337 	union ib_gid dgid;
338 	union ib_gid *pdgid;
339 
340 	if (skb->protocol == htons(ETH_P_IP)) {
341 		ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
342 				       (struct in6_addr *)&dgid);
343 		pdgid = &dgid;
344 	} else {
345 		pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr;
346 	}
347 
348 	return ib_find_cached_gid_by_port(&rxe->ib_dev, pdgid,
349 					  IB_GID_TYPE_ROCE_UDP_ENCAP,
350 					  1, rxe->ndev, NULL);
351 }
352 
353 /* rxe_rcv is called from the interface driver */
354 int rxe_rcv(struct sk_buff *skb)
355 {
356 	int err;
357 	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
358 	struct rxe_dev *rxe = pkt->rxe;
359 	__be32 *icrcp;
360 	u32 calc_icrc, pack_icrc;
361 
362 	pkt->offset = 0;
363 
364 	if (unlikely(skb->len < pkt->offset + RXE_BTH_BYTES))
365 		goto drop;
366 
367 	if (unlikely(rxe_match_dgid(rxe, skb) < 0)) {
368 		pr_warn_ratelimited("failed matching dgid\n");
369 		goto drop;
370 	}
371 
372 	pkt->opcode = bth_opcode(pkt);
373 	pkt->psn = bth_psn(pkt);
374 	pkt->qp = NULL;
375 	pkt->mask |= rxe_opcode[pkt->opcode].mask;
376 
377 	if (unlikely(skb->len < header_size(pkt)))
378 		goto drop;
379 
380 	err = hdr_check(pkt);
381 	if (unlikely(err))
382 		goto drop;
383 
384 	/* Verify ICRC */
385 	icrcp = (__be32 *)(pkt->hdr + pkt->paylen - RXE_ICRC_SIZE);
386 	pack_icrc = be32_to_cpu(*icrcp);
387 
388 	calc_icrc = rxe_icrc_hdr(pkt, skb);
389 	calc_icrc = rxe_crc32(rxe, calc_icrc, (u8 *)payload_addr(pkt),
390 			      payload_size(pkt));
391 	calc_icrc = (__force u32)cpu_to_be32(~calc_icrc);
392 	if (unlikely(calc_icrc != pack_icrc)) {
393 		if (skb->protocol == htons(ETH_P_IPV6))
394 			pr_warn_ratelimited("bad ICRC from %pI6c\n",
395 					    &ipv6_hdr(skb)->saddr);
396 		else if (skb->protocol == htons(ETH_P_IP))
397 			pr_warn_ratelimited("bad ICRC from %pI4\n",
398 					    &ip_hdr(skb)->saddr);
399 		else
400 			pr_warn_ratelimited("bad ICRC from unknown\n");
401 
402 		goto drop;
403 	}
404 
405 	rxe_counter_inc(rxe, RXE_CNT_RCVD_PKTS);
406 
407 	if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
408 		rxe_rcv_mcast_pkt(rxe, skb);
409 	else
410 		rxe_rcv_pkt(rxe, pkt, skb);
411 
412 	return 0;
413 
414 drop:
415 	if (pkt->qp)
416 		rxe_drop_ref(pkt->qp);
417 
418 	kfree_skb(skb);
419 	return 0;
420 }
421