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 #include <linux/if_arp.h>
9 #include <linux/netdevice.h>
10 #include <linux/if.h>
11 #include <linux/if_vlan.h>
12 #include <net/udp_tunnel.h>
13 #include <net/sch_generic.h>
14 #include <linux/netfilter.h>
15 #include <rdma/ib_addr.h>
16
17 #include "rxe.h"
18 #include "rxe_net.h"
19 #include "rxe_loc.h"
20
21 static struct rxe_recv_sockets recv_sockets;
22
rxe_find_route4(struct rxe_qp * qp,struct net_device * ndev,struct in_addr * saddr,struct in_addr * daddr)23 static struct dst_entry *rxe_find_route4(struct rxe_qp *qp,
24 struct net_device *ndev,
25 struct in_addr *saddr,
26 struct in_addr *daddr)
27 {
28 struct rtable *rt;
29 struct flowi4 fl = { { 0 } };
30
31 memset(&fl, 0, sizeof(fl));
32 fl.flowi4_oif = ndev->ifindex;
33 memcpy(&fl.saddr, saddr, sizeof(*saddr));
34 memcpy(&fl.daddr, daddr, sizeof(*daddr));
35 fl.flowi4_proto = IPPROTO_UDP;
36
37 rt = ip_route_output_key(&init_net, &fl);
38 if (IS_ERR(rt)) {
39 rxe_dbg_qp(qp, "no route to %pI4\n", &daddr->s_addr);
40 return NULL;
41 }
42
43 return &rt->dst;
44 }
45
46 #if IS_ENABLED(CONFIG_IPV6)
rxe_find_route6(struct rxe_qp * qp,struct net_device * ndev,struct in6_addr * saddr,struct in6_addr * daddr)47 static struct dst_entry *rxe_find_route6(struct rxe_qp *qp,
48 struct net_device *ndev,
49 struct in6_addr *saddr,
50 struct in6_addr *daddr)
51 {
52 struct dst_entry *ndst;
53 struct flowi6 fl6 = { { 0 } };
54
55 memset(&fl6, 0, sizeof(fl6));
56 fl6.flowi6_oif = ndev->ifindex;
57 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
58 memcpy(&fl6.daddr, daddr, sizeof(*daddr));
59 fl6.flowi6_proto = IPPROTO_UDP;
60
61 ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
62 recv_sockets.sk6->sk, &fl6,
63 NULL);
64 if (IS_ERR(ndst)) {
65 rxe_dbg_qp(qp, "no route to %pI6\n", daddr);
66 return NULL;
67 }
68
69 if (unlikely(ndst->error)) {
70 rxe_dbg_qp(qp, "no route to %pI6\n", daddr);
71 goto put;
72 }
73
74 return ndst;
75 put:
76 dst_release(ndst);
77 return NULL;
78 }
79
80 #else
81
rxe_find_route6(struct rxe_qp * qp,struct net_device * ndev,struct in6_addr * saddr,struct in6_addr * daddr)82 static struct dst_entry *rxe_find_route6(struct rxe_qp *qp,
83 struct net_device *ndev,
84 struct in6_addr *saddr,
85 struct in6_addr *daddr)
86 {
87 return NULL;
88 }
89
90 #endif
91
rxe_find_route(struct net_device * ndev,struct rxe_qp * qp,struct rxe_av * av)92 static struct dst_entry *rxe_find_route(struct net_device *ndev,
93 struct rxe_qp *qp,
94 struct rxe_av *av)
95 {
96 struct dst_entry *dst = NULL;
97
98 if (qp_type(qp) == IB_QPT_RC)
99 dst = sk_dst_get(qp->sk->sk);
100
101 if (!dst || !dst_check(dst, qp->dst_cookie)) {
102 if (dst)
103 dst_release(dst);
104
105 if (av->network_type == RXE_NETWORK_TYPE_IPV4) {
106 struct in_addr *saddr;
107 struct in_addr *daddr;
108
109 saddr = &av->sgid_addr._sockaddr_in.sin_addr;
110 daddr = &av->dgid_addr._sockaddr_in.sin_addr;
111 dst = rxe_find_route4(qp, ndev, saddr, daddr);
112 } else if (av->network_type == RXE_NETWORK_TYPE_IPV6) {
113 struct in6_addr *saddr6;
114 struct in6_addr *daddr6;
115
116 saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
117 daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
118 dst = rxe_find_route6(qp, ndev, saddr6, daddr6);
119 #if IS_ENABLED(CONFIG_IPV6)
120 if (dst)
121 qp->dst_cookie =
122 rt6_get_cookie((struct rt6_info *)dst);
123 #endif
124 }
125
126 if (dst && (qp_type(qp) == IB_QPT_RC)) {
127 dst_hold(dst);
128 sk_dst_set(qp->sk->sk, dst);
129 }
130 }
131 return dst;
132 }
133
rxe_udp_encap_recv(struct sock * sk,struct sk_buff * skb)134 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
135 {
136 struct udphdr *udph;
137 struct rxe_dev *rxe;
138 struct net_device *ndev = skb->dev;
139 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
140
141 /* takes a reference on rxe->ib_dev
142 * drop when skb is freed
143 */
144 rxe = rxe_get_dev_from_net(ndev);
145 if (!rxe && is_vlan_dev(ndev))
146 rxe = rxe_get_dev_from_net(vlan_dev_real_dev(ndev));
147 if (!rxe)
148 goto drop;
149
150 if (skb_linearize(skb)) {
151 ib_device_put(&rxe->ib_dev);
152 goto drop;
153 }
154
155 udph = udp_hdr(skb);
156 pkt->rxe = rxe;
157 pkt->port_num = 1;
158 pkt->hdr = (u8 *)(udph + 1);
159 pkt->mask = RXE_GRH_MASK;
160 pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
161
162 /* remove udp header */
163 skb_pull(skb, sizeof(struct udphdr));
164
165 rxe_rcv(skb);
166
167 return 0;
168 drop:
169 kfree_skb(skb);
170
171 return 0;
172 }
173
rxe_setup_udp_tunnel(struct net * net,__be16 port,bool ipv6)174 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
175 bool ipv6)
176 {
177 int err;
178 struct socket *sock;
179 struct udp_port_cfg udp_cfg = { };
180 struct udp_tunnel_sock_cfg tnl_cfg = { };
181
182 if (ipv6) {
183 udp_cfg.family = AF_INET6;
184 udp_cfg.ipv6_v6only = 1;
185 } else {
186 udp_cfg.family = AF_INET;
187 }
188
189 udp_cfg.local_udp_port = port;
190
191 /* Create UDP socket */
192 err = udp_sock_create(net, &udp_cfg, &sock);
193 if (err < 0)
194 return ERR_PTR(err);
195
196 tnl_cfg.encap_type = 1;
197 tnl_cfg.encap_rcv = rxe_udp_encap_recv;
198
199 /* Setup UDP tunnel */
200 setup_udp_tunnel_sock(net, sock, &tnl_cfg);
201
202 return sock;
203 }
204
rxe_release_udp_tunnel(struct socket * sk)205 static void rxe_release_udp_tunnel(struct socket *sk)
206 {
207 if (sk)
208 udp_tunnel_sock_release(sk);
209 }
210
prepare_udp_hdr(struct sk_buff * skb,__be16 src_port,__be16 dst_port)211 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
212 __be16 dst_port)
213 {
214 struct udphdr *udph;
215
216 __skb_push(skb, sizeof(*udph));
217 skb_reset_transport_header(skb);
218 udph = udp_hdr(skb);
219
220 udph->dest = dst_port;
221 udph->source = src_port;
222 udph->len = htons(skb->len);
223 udph->check = 0;
224 }
225
prepare_ipv4_hdr(struct dst_entry * dst,struct sk_buff * skb,__be32 saddr,__be32 daddr,__u8 proto,__u8 tos,__u8 ttl,__be16 df,bool xnet)226 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
227 __be32 saddr, __be32 daddr, __u8 proto,
228 __u8 tos, __u8 ttl, __be16 df, bool xnet)
229 {
230 struct iphdr *iph;
231
232 skb_scrub_packet(skb, xnet);
233
234 skb_clear_hash(skb);
235 skb_dst_set(skb, dst_clone(dst));
236 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
237
238 skb_push(skb, sizeof(struct iphdr));
239 skb_reset_network_header(skb);
240
241 iph = ip_hdr(skb);
242
243 iph->version = IPVERSION;
244 iph->ihl = sizeof(struct iphdr) >> 2;
245 iph->tot_len = htons(skb->len);
246 iph->frag_off = df;
247 iph->protocol = proto;
248 iph->tos = tos;
249 iph->daddr = daddr;
250 iph->saddr = saddr;
251 iph->ttl = ttl;
252 __ip_select_ident(dev_net(dst->dev), iph,
253 skb_shinfo(skb)->gso_segs ?: 1);
254 }
255
prepare_ipv6_hdr(struct dst_entry * dst,struct sk_buff * skb,struct in6_addr * saddr,struct in6_addr * daddr,__u8 proto,__u8 prio,__u8 ttl)256 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
257 struct in6_addr *saddr, struct in6_addr *daddr,
258 __u8 proto, __u8 prio, __u8 ttl)
259 {
260 struct ipv6hdr *ip6h;
261
262 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
263 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
264 | IPSKB_REROUTED);
265 skb_dst_set(skb, dst_clone(dst));
266
267 __skb_push(skb, sizeof(*ip6h));
268 skb_reset_network_header(skb);
269 ip6h = ipv6_hdr(skb);
270 ip6_flow_hdr(ip6h, prio, htonl(0));
271 ip6h->payload_len = htons(skb->len);
272 ip6h->nexthdr = proto;
273 ip6h->hop_limit = ttl;
274 ip6h->daddr = *daddr;
275 ip6h->saddr = *saddr;
276 ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
277 }
278
prepare4(struct rxe_av * av,struct rxe_pkt_info * pkt,struct sk_buff * skb)279 static int prepare4(struct rxe_av *av, struct rxe_pkt_info *pkt,
280 struct sk_buff *skb)
281 {
282 struct rxe_qp *qp = pkt->qp;
283 struct dst_entry *dst;
284 bool xnet = false;
285 __be16 df = htons(IP_DF);
286 struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
287 struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
288
289 dst = rxe_find_route(skb->dev, qp, av);
290 if (!dst) {
291 rxe_dbg_qp(qp, "Host not reachable\n");
292 return -EHOSTUNREACH;
293 }
294
295 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
296 cpu_to_be16(ROCE_V2_UDP_DPORT));
297
298 prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
299 av->grh.traffic_class, av->grh.hop_limit, df, xnet);
300
301 dst_release(dst);
302 return 0;
303 }
304
prepare6(struct rxe_av * av,struct rxe_pkt_info * pkt,struct sk_buff * skb)305 static int prepare6(struct rxe_av *av, struct rxe_pkt_info *pkt,
306 struct sk_buff *skb)
307 {
308 struct rxe_qp *qp = pkt->qp;
309 struct dst_entry *dst;
310 struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
311 struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
312
313 dst = rxe_find_route(skb->dev, qp, av);
314 if (!dst) {
315 rxe_dbg_qp(qp, "Host not reachable\n");
316 return -EHOSTUNREACH;
317 }
318
319 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
320 cpu_to_be16(ROCE_V2_UDP_DPORT));
321
322 prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
323 av->grh.traffic_class,
324 av->grh.hop_limit);
325
326 dst_release(dst);
327 return 0;
328 }
329
rxe_prepare(struct rxe_av * av,struct rxe_pkt_info * pkt,struct sk_buff * skb)330 int rxe_prepare(struct rxe_av *av, struct rxe_pkt_info *pkt,
331 struct sk_buff *skb)
332 {
333 int err = 0;
334
335 if (skb->protocol == htons(ETH_P_IP))
336 err = prepare4(av, pkt, skb);
337 else if (skb->protocol == htons(ETH_P_IPV6))
338 err = prepare6(av, pkt, skb);
339
340 if (ether_addr_equal(skb->dev->dev_addr, av->dmac))
341 pkt->mask |= RXE_LOOPBACK_MASK;
342
343 return err;
344 }
345
rxe_skb_tx_dtor(struct sk_buff * skb)346 static void rxe_skb_tx_dtor(struct sk_buff *skb)
347 {
348 struct rxe_qp *qp = skb->sk->sk_user_data;
349 int skb_out;
350
351 skb_out = atomic_dec_return(&qp->skb_out);
352 if (unlikely(qp->need_req_skb &&
353 skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
354 rxe_sched_task(&qp->send_task);
355
356 rxe_put(qp);
357 sock_put(skb->sk);
358 }
359
rxe_send(struct sk_buff * skb,struct rxe_pkt_info * pkt)360 static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)
361 {
362 int err;
363 struct sock *sk = pkt->qp->sk->sk;
364
365 sock_hold(sk);
366 skb->sk = sk;
367 skb->destructor = rxe_skb_tx_dtor;
368 rxe_get(pkt->qp);
369 atomic_inc(&pkt->qp->skb_out);
370
371 if (skb->protocol == htons(ETH_P_IP))
372 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
373 else
374 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
375
376 return err;
377 }
378
379 /* fix up a send packet to match the packets
380 * received from UDP before looping them back
381 */
rxe_loopback(struct sk_buff * skb,struct rxe_pkt_info * pkt)382 static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)
383 {
384 struct sock *sk = pkt->qp->sk->sk;
385
386 memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt));
387
388 sock_hold(sk);
389 skb->sk = sk;
390 skb->destructor = rxe_skb_tx_dtor;
391 rxe_get(pkt->qp);
392 atomic_inc(&pkt->qp->skb_out);
393
394 if (skb->protocol == htons(ETH_P_IP))
395 skb_pull(skb, sizeof(struct iphdr));
396 else
397 skb_pull(skb, sizeof(struct ipv6hdr));
398
399 if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) {
400 kfree_skb(skb);
401 return -EIO;
402 }
403
404 /* remove udp header */
405 skb_pull(skb, sizeof(struct udphdr));
406
407 rxe_rcv(skb);
408
409 return 0;
410 }
411
rxe_xmit_packet(struct rxe_qp * qp,struct rxe_pkt_info * pkt,struct sk_buff * skb)412 int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
413 struct sk_buff *skb)
414 {
415 int err;
416 int is_request = pkt->mask & RXE_REQ_MASK;
417 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
418 unsigned long flags;
419
420 spin_lock_irqsave(&qp->state_lock, flags);
421 if ((is_request && (qp_state(qp) < IB_QPS_RTS)) ||
422 (!is_request && (qp_state(qp) < IB_QPS_RTR))) {
423 spin_unlock_irqrestore(&qp->state_lock, flags);
424 rxe_dbg_qp(qp, "Packet dropped. QP is not in ready state\n");
425 goto drop;
426 }
427 spin_unlock_irqrestore(&qp->state_lock, flags);
428
429 rxe_icrc_generate(skb, pkt);
430
431 if (pkt->mask & RXE_LOOPBACK_MASK)
432 err = rxe_loopback(skb, pkt);
433 else
434 err = rxe_send(skb, pkt);
435 if (err) {
436 rxe_counter_inc(rxe, RXE_CNT_SEND_ERR);
437 return err;
438 }
439
440 rxe_counter_inc(rxe, RXE_CNT_SENT_PKTS);
441 goto done;
442
443 drop:
444 kfree_skb(skb);
445 err = 0;
446 done:
447 return err;
448 }
449
rxe_init_packet(struct rxe_dev * rxe,struct rxe_av * av,int paylen,struct rxe_pkt_info * pkt)450 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
451 int paylen, struct rxe_pkt_info *pkt)
452 {
453 unsigned int hdr_len;
454 struct sk_buff *skb = NULL;
455 struct net_device *ndev;
456 const struct ib_gid_attr *attr;
457 const int port_num = 1;
458
459 attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index);
460 if (IS_ERR(attr))
461 return NULL;
462
463 if (av->network_type == RXE_NETWORK_TYPE_IPV4)
464 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
465 sizeof(struct iphdr);
466 else
467 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
468 sizeof(struct ipv6hdr);
469
470 rcu_read_lock();
471 ndev = rdma_read_gid_attr_ndev_rcu(attr);
472 if (IS_ERR(ndev)) {
473 rcu_read_unlock();
474 goto out;
475 }
476 skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev),
477 GFP_ATOMIC);
478
479 if (unlikely(!skb)) {
480 rcu_read_unlock();
481 goto out;
482 }
483
484 /* Add time stamp to skb. */
485 skb->tstamp = ktime_get();
486
487 skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));
488
489 /* FIXME: hold reference to this netdev until life of this skb. */
490 skb->dev = ndev;
491 rcu_read_unlock();
492
493 if (av->network_type == RXE_NETWORK_TYPE_IPV4)
494 skb->protocol = htons(ETH_P_IP);
495 else
496 skb->protocol = htons(ETH_P_IPV6);
497
498 pkt->rxe = rxe;
499 pkt->port_num = port_num;
500 pkt->hdr = skb_put(skb, paylen);
501 pkt->mask |= RXE_GRH_MASK;
502
503 out:
504 rdma_put_gid_attr(attr);
505 return skb;
506 }
507
508 /*
509 * this is required by rxe_cfg to match rxe devices in
510 * /sys/class/infiniband up with their underlying ethernet devices
511 */
rxe_parent_name(struct rxe_dev * rxe,unsigned int port_num)512 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
513 {
514 struct net_device *ndev;
515 char *ndev_name;
516
517 ndev = rxe_ib_device_get_netdev(&rxe->ib_dev);
518 if (!ndev)
519 return NULL;
520 ndev_name = ndev->name;
521 dev_put(ndev);
522
523 return ndev_name;
524 }
525
rxe_net_add(const char * ibdev_name,struct net_device * ndev)526 int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
527 {
528 int err;
529 struct rxe_dev *rxe = NULL;
530
531 rxe = ib_alloc_device(rxe_dev, ib_dev);
532 if (!rxe)
533 return -ENOMEM;
534
535 ib_mark_name_assigned_by_user(&rxe->ib_dev);
536
537 err = rxe_add(rxe, ndev->mtu, ibdev_name, ndev);
538 if (err) {
539 ib_dealloc_device(&rxe->ib_dev);
540 return err;
541 }
542
543 return 0;
544 }
545
rxe_port_event(struct rxe_dev * rxe,enum ib_event_type event)546 static void rxe_port_event(struct rxe_dev *rxe,
547 enum ib_event_type event)
548 {
549 struct ib_event ev;
550
551 ev.device = &rxe->ib_dev;
552 ev.element.port_num = 1;
553 ev.event = event;
554
555 ib_dispatch_event(&ev);
556 }
557
558 /* Caller must hold net_info_lock */
rxe_port_up(struct rxe_dev * rxe)559 void rxe_port_up(struct rxe_dev *rxe)
560 {
561 rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
562 dev_info(&rxe->ib_dev.dev, "set active\n");
563 }
564
565 /* Caller must hold net_info_lock */
rxe_port_down(struct rxe_dev * rxe)566 void rxe_port_down(struct rxe_dev *rxe)
567 {
568 rxe_port_event(rxe, IB_EVENT_PORT_ERR);
569 rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
570 dev_info(&rxe->ib_dev.dev, "set down\n");
571 }
572
rxe_set_port_state(struct rxe_dev * rxe)573 void rxe_set_port_state(struct rxe_dev *rxe)
574 {
575 struct net_device *ndev;
576
577 ndev = rxe_ib_device_get_netdev(&rxe->ib_dev);
578 if (!ndev)
579 return;
580
581 if (ib_get_curr_port_state(ndev) == IB_PORT_ACTIVE)
582 rxe_port_up(rxe);
583 else
584 rxe_port_down(rxe);
585
586 dev_put(ndev);
587 }
588
rxe_notify(struct notifier_block * not_blk,unsigned long event,void * arg)589 static int rxe_notify(struct notifier_block *not_blk,
590 unsigned long event,
591 void *arg)
592 {
593 struct net_device *ndev = netdev_notifier_info_to_dev(arg);
594 struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
595
596 if (!rxe)
597 return NOTIFY_OK;
598
599 switch (event) {
600 case NETDEV_UNREGISTER:
601 ib_unregister_device_queued(&rxe->ib_dev);
602 break;
603 case NETDEV_CHANGEMTU:
604 rxe_dbg_dev(rxe, "%s changed mtu to %d\n", ndev->name, ndev->mtu);
605 rxe_set_mtu(rxe, ndev->mtu);
606 break;
607 case NETDEV_DOWN:
608 case NETDEV_CHANGE:
609 if (ib_get_curr_port_state(ndev) == IB_PORT_DOWN)
610 rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
611 break;
612 case NETDEV_REBOOT:
613 case NETDEV_GOING_DOWN:
614 case NETDEV_CHANGEADDR:
615 case NETDEV_CHANGENAME:
616 case NETDEV_FEAT_CHANGE:
617 default:
618 rxe_dbg_dev(rxe, "ignoring netdev event = %ld for %s\n",
619 event, ndev->name);
620 break;
621 }
622
623 ib_device_put(&rxe->ib_dev);
624 return NOTIFY_OK;
625 }
626
627 static struct notifier_block rxe_net_notifier = {
628 .notifier_call = rxe_notify,
629 };
630
rxe_net_ipv4_init(void)631 static int rxe_net_ipv4_init(void)
632 {
633 recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
634 htons(ROCE_V2_UDP_DPORT), false);
635 if (IS_ERR(recv_sockets.sk4)) {
636 recv_sockets.sk4 = NULL;
637 pr_err("Failed to create IPv4 UDP tunnel\n");
638 return -1;
639 }
640
641 return 0;
642 }
643
rxe_net_ipv6_init(void)644 static int rxe_net_ipv6_init(void)
645 {
646 #if IS_ENABLED(CONFIG_IPV6)
647
648 recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
649 htons(ROCE_V2_UDP_DPORT), true);
650 if (PTR_ERR(recv_sockets.sk6) == -EAFNOSUPPORT) {
651 recv_sockets.sk6 = NULL;
652 pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n");
653 return 0;
654 }
655
656 if (IS_ERR(recv_sockets.sk6)) {
657 recv_sockets.sk6 = NULL;
658 pr_err("Failed to create IPv6 UDP tunnel\n");
659 return -1;
660 }
661 #endif
662 return 0;
663 }
664
rxe_net_exit(void)665 void rxe_net_exit(void)
666 {
667 rxe_release_udp_tunnel(recv_sockets.sk6);
668 rxe_release_udp_tunnel(recv_sockets.sk4);
669 unregister_netdevice_notifier(&rxe_net_notifier);
670 }
671
rxe_net_init(void)672 int rxe_net_init(void)
673 {
674 int err;
675
676 recv_sockets.sk6 = NULL;
677
678 err = rxe_net_ipv4_init();
679 if (err)
680 return err;
681 err = rxe_net_ipv6_init();
682 if (err)
683 goto err_out;
684 err = register_netdevice_notifier(&rxe_net_notifier);
685 if (err) {
686 pr_err("Failed to register netdev notifier\n");
687 goto err_out;
688 }
689 return 0;
690 err_out:
691 rxe_net_exit();
692 return err;
693 }
694