1 | // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB |
2 | /* |
3 | * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. |
4 | * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. |
5 | */ |
6 | |
7 | #include <linux/skbuff.h> |
8 | |
9 | #include "rxe.h" |
10 | #include "rxe_loc.h" |
11 | |
12 | /* check that QP matches packet opcode type and is in a valid state */ |
13 | static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, |
14 | struct rxe_qp *qp) |
15 | { |
16 | unsigned int pkt_type; |
17 | unsigned long flags; |
18 | |
19 | if (unlikely(!qp->valid)) |
20 | return -EINVAL; |
21 | |
22 | pkt_type = pkt->opcode & 0xe0; |
23 | |
24 | switch (qp_type(qp)) { |
25 | case IB_QPT_RC: |
26 | if (unlikely(pkt_type != IB_OPCODE_RC)) |
27 | return -EINVAL; |
28 | break; |
29 | case IB_QPT_UC: |
30 | if (unlikely(pkt_type != IB_OPCODE_UC)) |
31 | return -EINVAL; |
32 | break; |
33 | case IB_QPT_UD: |
34 | case IB_QPT_GSI: |
35 | if (unlikely(pkt_type != IB_OPCODE_UD)) |
36 | return -EINVAL; |
37 | break; |
38 | default: |
39 | return -EINVAL; |
40 | } |
41 | |
42 | spin_lock_irqsave(&qp->state_lock, flags); |
43 | if (pkt->mask & RXE_REQ_MASK) { |
44 | if (unlikely(qp_state(qp) < IB_QPS_RTR)) { |
45 | spin_unlock_irqrestore(lock: &qp->state_lock, flags); |
46 | return -EINVAL; |
47 | } |
48 | } else { |
49 | if (unlikely(qp_state(qp) < IB_QPS_RTS)) { |
50 | spin_unlock_irqrestore(lock: &qp->state_lock, flags); |
51 | return -EINVAL; |
52 | } |
53 | } |
54 | spin_unlock_irqrestore(lock: &qp->state_lock, flags); |
55 | |
56 | return 0; |
57 | } |
58 | |
59 | static void set_bad_pkey_cntr(struct rxe_port *port) |
60 | { |
61 | spin_lock_bh(lock: &port->port_lock); |
62 | port->attr.bad_pkey_cntr = min((u32)0xffff, |
63 | port->attr.bad_pkey_cntr + 1); |
64 | spin_unlock_bh(lock: &port->port_lock); |
65 | } |
66 | |
67 | static void set_qkey_viol_cntr(struct rxe_port *port) |
68 | { |
69 | spin_lock_bh(lock: &port->port_lock); |
70 | port->attr.qkey_viol_cntr = min((u32)0xffff, |
71 | port->attr.qkey_viol_cntr + 1); |
72 | spin_unlock_bh(lock: &port->port_lock); |
73 | } |
74 | |
75 | static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, |
76 | u32 qpn, struct rxe_qp *qp) |
77 | { |
78 | struct rxe_port *port = &rxe->port; |
79 | u16 pkey = bth_pkey(pkt); |
80 | |
81 | pkt->pkey_index = 0; |
82 | |
83 | if (!pkey_match(key1: pkey, IB_DEFAULT_PKEY_FULL)) { |
84 | set_bad_pkey_cntr(port); |
85 | return -EINVAL; |
86 | } |
87 | |
88 | if (qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) { |
89 | u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey; |
90 | |
91 | if (unlikely(deth_qkey(pkt) != qkey)) { |
92 | set_qkey_viol_cntr(port); |
93 | return -EINVAL; |
94 | } |
95 | } |
96 | |
97 | return 0; |
98 | } |
99 | |
100 | static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, |
101 | struct rxe_qp *qp) |
102 | { |
103 | struct sk_buff *skb = PKT_TO_SKB(pkt); |
104 | |
105 | if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC) |
106 | return 0; |
107 | |
108 | if (unlikely(pkt->port_num != qp->attr.port_num)) |
109 | return -EINVAL; |
110 | |
111 | if (skb->protocol == htons(ETH_P_IP)) { |
112 | struct in_addr *saddr = |
113 | &qp->pri_av.sgid_addr._sockaddr_in.sin_addr; |
114 | struct in_addr *daddr = |
115 | &qp->pri_av.dgid_addr._sockaddr_in.sin_addr; |
116 | |
117 | if ((ip_hdr(skb)->daddr != saddr->s_addr) || |
118 | (ip_hdr(skb)->saddr != daddr->s_addr)) |
119 | return -EINVAL; |
120 | |
121 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
122 | struct in6_addr *saddr = |
123 | &qp->pri_av.sgid_addr._sockaddr_in6.sin6_addr; |
124 | struct in6_addr *daddr = |
125 | &qp->pri_av.dgid_addr._sockaddr_in6.sin6_addr; |
126 | |
127 | if (memcmp(p: &ipv6_hdr(skb)->daddr, q: saddr, size: sizeof(*saddr)) || |
128 | memcmp(p: &ipv6_hdr(skb)->saddr, q: daddr, size: sizeof(*daddr))) |
129 | return -EINVAL; |
130 | } |
131 | |
132 | return 0; |
133 | } |
134 | |
135 | static int hdr_check(struct rxe_pkt_info *pkt) |
136 | { |
137 | struct rxe_dev *rxe = pkt->rxe; |
138 | struct rxe_port *port = &rxe->port; |
139 | struct rxe_qp *qp = NULL; |
140 | u32 qpn = bth_qpn(pkt); |
141 | int index; |
142 | int err; |
143 | |
144 | if (unlikely(bth_tver(pkt) != BTH_TVER)) |
145 | goto err1; |
146 | |
147 | if (unlikely(qpn == 0)) |
148 | goto err1; |
149 | |
150 | if (qpn != IB_MULTICAST_QPN) { |
151 | index = (qpn == 1) ? port->qp_gsi_index : qpn; |
152 | |
153 | qp = rxe_pool_get_index(pool: &rxe->qp_pool, index); |
154 | if (unlikely(!qp)) |
155 | goto err1; |
156 | |
157 | err = check_type_state(rxe, pkt, qp); |
158 | if (unlikely(err)) |
159 | goto err2; |
160 | |
161 | err = check_addr(rxe, pkt, qp); |
162 | if (unlikely(err)) |
163 | goto err2; |
164 | |
165 | err = check_keys(rxe, pkt, qpn, qp); |
166 | if (unlikely(err)) |
167 | goto err2; |
168 | } else { |
169 | if (unlikely((pkt->mask & RXE_GRH_MASK) == 0)) |
170 | goto err1; |
171 | } |
172 | |
173 | pkt->qp = qp; |
174 | return 0; |
175 | |
176 | err2: |
177 | rxe_put(qp); |
178 | err1: |
179 | return -EINVAL; |
180 | } |
181 | |
182 | static inline void rxe_rcv_pkt(struct rxe_pkt_info *pkt, struct sk_buff *skb) |
183 | { |
184 | if (pkt->mask & RXE_REQ_MASK) |
185 | rxe_resp_queue_pkt(qp: pkt->qp, skb); |
186 | else |
187 | rxe_comp_queue_pkt(qp: pkt->qp, skb); |
188 | } |
189 | |
190 | static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb) |
191 | { |
192 | struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); |
193 | struct rxe_mcg *mcg; |
194 | struct rxe_mca *mca; |
195 | struct rxe_qp *qp; |
196 | union ib_gid dgid; |
197 | int err; |
198 | |
199 | if (skb->protocol == htons(ETH_P_IP)) |
200 | ipv6_addr_set_v4mapped(addr: ip_hdr(skb)->daddr, |
201 | v4mapped: (struct in6_addr *)&dgid); |
202 | else if (skb->protocol == htons(ETH_P_IPV6)) |
203 | memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid)); |
204 | |
205 | /* lookup mcast group corresponding to mgid, takes a ref */ |
206 | mcg = rxe_lookup_mcg(rxe, mgid: &dgid); |
207 | if (!mcg) |
208 | goto drop; /* mcast group not registered */ |
209 | |
210 | spin_lock_bh(lock: &rxe->mcg_lock); |
211 | |
212 | /* this is unreliable datagram service so we let |
213 | * failures to deliver a multicast packet to a |
214 | * single QP happen and just move on and try |
215 | * the rest of them on the list |
216 | */ |
217 | list_for_each_entry(mca, &mcg->qp_list, qp_list) { |
218 | qp = mca->qp; |
219 | |
220 | /* validate qp for incoming packet */ |
221 | err = check_type_state(rxe, pkt, qp); |
222 | if (err) |
223 | continue; |
224 | |
225 | err = check_keys(rxe, pkt, qpn: bth_qpn(pkt), qp); |
226 | if (err) |
227 | continue; |
228 | |
229 | /* for all but the last QP create a new clone of the |
230 | * skb and pass to the QP. Pass the original skb to |
231 | * the last QP in the list. |
232 | */ |
233 | if (mca->qp_list.next != &mcg->qp_list) { |
234 | struct sk_buff *cskb; |
235 | struct rxe_pkt_info *cpkt; |
236 | |
237 | cskb = skb_clone(skb, GFP_ATOMIC); |
238 | if (unlikely(!cskb)) |
239 | continue; |
240 | |
241 | if (WARN_ON(!ib_device_try_get(&rxe->ib_dev))) { |
242 | kfree_skb(skb: cskb); |
243 | break; |
244 | } |
245 | |
246 | cpkt = SKB_TO_PKT(skb: cskb); |
247 | cpkt->qp = qp; |
248 | rxe_get(qp); |
249 | rxe_rcv_pkt(pkt: cpkt, skb: cskb); |
250 | } else { |
251 | pkt->qp = qp; |
252 | rxe_get(qp); |
253 | rxe_rcv_pkt(pkt, skb); |
254 | skb = NULL; /* mark consumed */ |
255 | } |
256 | } |
257 | |
258 | spin_unlock_bh(lock: &rxe->mcg_lock); |
259 | |
260 | kref_put(kref: &mcg->ref_cnt, release: rxe_cleanup_mcg); |
261 | |
262 | if (likely(!skb)) |
263 | return; |
264 | |
265 | /* This only occurs if one of the checks fails on the last |
266 | * QP in the list above |
267 | */ |
268 | |
269 | drop: |
270 | kfree_skb(skb); |
271 | ib_device_put(device: &rxe->ib_dev); |
272 | } |
273 | |
274 | /** |
275 | * rxe_chk_dgid - validate destination IP address |
276 | * @rxe: rxe device that received packet |
277 | * @skb: the received packet buffer |
278 | * |
279 | * Accept any loopback packets |
280 | * Extract IP address from packet and |
281 | * Accept if multicast packet |
282 | * Accept if matches an SGID table entry |
283 | */ |
284 | static int rxe_chk_dgid(struct rxe_dev *rxe, struct sk_buff *skb) |
285 | { |
286 | struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); |
287 | const struct ib_gid_attr *gid_attr; |
288 | union ib_gid dgid; |
289 | union ib_gid *pdgid; |
290 | |
291 | if (pkt->mask & RXE_LOOPBACK_MASK) |
292 | return 0; |
293 | |
294 | if (skb->protocol == htons(ETH_P_IP)) { |
295 | ipv6_addr_set_v4mapped(addr: ip_hdr(skb)->daddr, |
296 | v4mapped: (struct in6_addr *)&dgid); |
297 | pdgid = &dgid; |
298 | } else { |
299 | pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr; |
300 | } |
301 | |
302 | if (rdma_is_multicast_addr(addr: (struct in6_addr *)pdgid)) |
303 | return 0; |
304 | |
305 | gid_attr = rdma_find_gid_by_port(ib_dev: &rxe->ib_dev, gid: pdgid, |
306 | gid_type: IB_GID_TYPE_ROCE_UDP_ENCAP, |
307 | port: 1, ndev: skb->dev); |
308 | if (IS_ERR(ptr: gid_attr)) |
309 | return PTR_ERR(ptr: gid_attr); |
310 | |
311 | rdma_put_gid_attr(attr: gid_attr); |
312 | return 0; |
313 | } |
314 | |
315 | /* rxe_rcv is called from the interface driver */ |
316 | void rxe_rcv(struct sk_buff *skb) |
317 | { |
318 | int err; |
319 | struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); |
320 | struct rxe_dev *rxe = pkt->rxe; |
321 | |
322 | if (unlikely(skb->len < RXE_BTH_BYTES)) |
323 | goto drop; |
324 | |
325 | if (rxe_chk_dgid(rxe, skb) < 0) |
326 | goto drop; |
327 | |
328 | pkt->opcode = bth_opcode(pkt); |
329 | pkt->psn = bth_psn(pkt); |
330 | pkt->qp = NULL; |
331 | pkt->mask |= rxe_opcode[pkt->opcode].mask; |
332 | |
333 | if (unlikely(skb->len < header_size(pkt))) |
334 | goto drop; |
335 | |
336 | err = hdr_check(pkt); |
337 | if (unlikely(err)) |
338 | goto drop; |
339 | |
340 | err = rxe_icrc_check(skb, pkt); |
341 | if (unlikely(err)) |
342 | goto drop; |
343 | |
344 | rxe_counter_inc(rxe, index: RXE_CNT_RCVD_PKTS); |
345 | |
346 | if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN)) |
347 | rxe_rcv_mcast_pkt(rxe, skb); |
348 | else |
349 | rxe_rcv_pkt(pkt, skb); |
350 | |
351 | return; |
352 | |
353 | drop: |
354 | if (pkt->qp) |
355 | rxe_put(pkt->qp); |
356 | |
357 | kfree_skb(skb); |
358 | ib_device_put(device: &rxe->ib_dev); |
359 | } |
360 | |