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 (unlikely(qpn == 0)) {
229 		pr_warn_once("QP 0 not supported");
230 		goto err1;
231 	}
232 
233 	if (qpn != IB_MULTICAST_QPN) {
234 		index = (qpn == 1) ? port->qp_gsi_index : qpn;
235 
236 		qp = rxe_pool_get_index(&rxe->qp_pool, index);
237 		if (unlikely(!qp)) {
238 			pr_warn_ratelimited("no qp matches qpn 0x%x\n", qpn);
239 			goto err1;
240 		}
241 
242 		err = check_type_state(rxe, pkt, qp);
243 		if (unlikely(err))
244 			goto err2;
245 
246 		err = check_addr(rxe, pkt, qp);
247 		if (unlikely(err))
248 			goto err2;
249 
250 		err = check_keys(rxe, pkt, qpn, qp);
251 		if (unlikely(err))
252 			goto err2;
253 	} else {
254 		if (unlikely((pkt->mask & RXE_GRH_MASK) == 0)) {
255 			pr_warn_ratelimited("no grh for mcast qpn\n");
256 			goto err1;
257 		}
258 	}
259 
260 	pkt->qp = qp;
261 	return 0;
262 
263 err2:
264 	rxe_drop_ref(qp);
265 err1:
266 	return -EINVAL;
267 }
268 
269 static inline void rxe_rcv_pkt(struct rxe_dev *rxe,
270 			       struct rxe_pkt_info *pkt,
271 			       struct sk_buff *skb)
272 {
273 	if (pkt->mask & RXE_REQ_MASK)
274 		rxe_resp_queue_pkt(rxe, pkt->qp, skb);
275 	else
276 		rxe_comp_queue_pkt(rxe, pkt->qp, skb);
277 }
278 
279 static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
280 {
281 	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
282 	struct rxe_mc_grp *mcg;
283 	struct rxe_mc_elem *mce;
284 	struct rxe_qp *qp;
285 	union ib_gid dgid;
286 	int err;
287 
288 	if (skb->protocol == htons(ETH_P_IP))
289 		ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
290 				       (struct in6_addr *)&dgid);
291 	else if (skb->protocol == htons(ETH_P_IPV6))
292 		memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));
293 
294 	/* lookup mcast group corresponding to mgid, takes a ref */
295 	mcg = rxe_pool_get_key(&rxe->mc_grp_pool, &dgid);
296 	if (!mcg)
297 		goto err1;	/* mcast group not registered */
298 
299 	spin_lock_bh(&mcg->mcg_lock);
300 
301 	list_for_each_entry(mce, &mcg->qp_list, qp_list) {
302 		qp = mce->qp;
303 		pkt = SKB_TO_PKT(skb);
304 
305 		/* validate qp for incoming packet */
306 		err = check_type_state(rxe, pkt, qp);
307 		if (err)
308 			continue;
309 
310 		err = check_keys(rxe, pkt, bth_qpn(pkt), qp);
311 		if (err)
312 			continue;
313 
314 		/* if *not* the last qp in the list
315 		 * increase the users of the skb then post to the next qp
316 		 */
317 		if (mce->qp_list.next != &mcg->qp_list)
318 			skb_get(skb);
319 
320 		pkt->qp = qp;
321 		rxe_add_ref(qp);
322 		rxe_rcv_pkt(rxe, pkt, skb);
323 	}
324 
325 	spin_unlock_bh(&mcg->mcg_lock);
326 
327 	rxe_drop_ref(mcg);	/* drop ref from rxe_pool_get_key. */
328 
329 err1:
330 	kfree_skb(skb);
331 }
332 
333 static int rxe_match_dgid(struct rxe_dev *rxe, struct sk_buff *skb)
334 {
335 	const struct ib_gid_attr *gid_attr;
336 	union ib_gid dgid;
337 	union ib_gid *pdgid;
338 
339 	if (skb->protocol == htons(ETH_P_IP)) {
340 		ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
341 				       (struct in6_addr *)&dgid);
342 		pdgid = &dgid;
343 	} else {
344 		pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr;
345 	}
346 
347 	gid_attr = rdma_find_gid_by_port(&rxe->ib_dev, pdgid,
348 					 IB_GID_TYPE_ROCE_UDP_ENCAP,
349 					 1, skb->dev);
350 	if (IS_ERR(gid_attr))
351 		return PTR_ERR(gid_attr);
352 
353 	rdma_put_gid_attr(gid_attr);
354 	return 0;
355 }
356 
357 /* rxe_rcv is called from the interface driver */
358 void rxe_rcv(struct sk_buff *skb)
359 {
360 	int err;
361 	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
362 	struct rxe_dev *rxe = pkt->rxe;
363 	__be32 *icrcp;
364 	u32 calc_icrc, pack_icrc;
365 
366 	pkt->offset = 0;
367 
368 	if (unlikely(skb->len < pkt->offset + RXE_BTH_BYTES))
369 		goto drop;
370 
371 	if (unlikely(rxe_match_dgid(rxe, skb) < 0)) {
372 		pr_warn_ratelimited("failed matching dgid\n");
373 		goto drop;
374 	}
375 
376 	pkt->opcode = bth_opcode(pkt);
377 	pkt->psn = bth_psn(pkt);
378 	pkt->qp = NULL;
379 	pkt->mask |= rxe_opcode[pkt->opcode].mask;
380 
381 	if (unlikely(skb->len < header_size(pkt)))
382 		goto drop;
383 
384 	err = hdr_check(pkt);
385 	if (unlikely(err))
386 		goto drop;
387 
388 	/* Verify ICRC */
389 	icrcp = (__be32 *)(pkt->hdr + pkt->paylen - RXE_ICRC_SIZE);
390 	pack_icrc = be32_to_cpu(*icrcp);
391 
392 	calc_icrc = rxe_icrc_hdr(pkt, skb);
393 	calc_icrc = rxe_crc32(rxe, calc_icrc, (u8 *)payload_addr(pkt),
394 			      payload_size(pkt));
395 	calc_icrc = (__force u32)cpu_to_be32(~calc_icrc);
396 	if (unlikely(calc_icrc != pack_icrc)) {
397 		if (skb->protocol == htons(ETH_P_IPV6))
398 			pr_warn_ratelimited("bad ICRC from %pI6c\n",
399 					    &ipv6_hdr(skb)->saddr);
400 		else if (skb->protocol == htons(ETH_P_IP))
401 			pr_warn_ratelimited("bad ICRC from %pI4\n",
402 					    &ip_hdr(skb)->saddr);
403 		else
404 			pr_warn_ratelimited("bad ICRC from unknown\n");
405 
406 		goto drop;
407 	}
408 
409 	rxe_counter_inc(rxe, RXE_CNT_RCVD_PKTS);
410 
411 	if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
412 		rxe_rcv_mcast_pkt(rxe, skb);
413 	else
414 		rxe_rcv_pkt(rxe, pkt, skb);
415 
416 	return;
417 
418 drop:
419 	if (pkt->qp)
420 		rxe_drop_ref(pkt->qp);
421 
422 	kfree_skb(skb);
423 }
424