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 net_device * ndev,struct in_addr * saddr,struct in_addr * daddr)23 static struct dst_entry *rxe_find_route4(struct net_device *ndev,
24 struct in_addr *saddr,
25 struct in_addr *daddr)
26 {
27 struct rtable *rt;
28 struct flowi4 fl = { { 0 } };
29
30 memset(&fl, 0, sizeof(fl));
31 fl.flowi4_oif = ndev->ifindex;
32 memcpy(&fl.saddr, saddr, sizeof(*saddr));
33 memcpy(&fl.daddr, daddr, sizeof(*daddr));
34 fl.flowi4_proto = IPPROTO_UDP;
35
36 rt = ip_route_output_key(&init_net, &fl);
37 if (IS_ERR(rt)) {
38 pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr);
39 return NULL;
40 }
41
42 return &rt->dst;
43 }
44
45 #if IS_ENABLED(CONFIG_IPV6)
rxe_find_route6(struct net_device * ndev,struct in6_addr * saddr,struct in6_addr * daddr)46 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
47 struct in6_addr *saddr,
48 struct in6_addr *daddr)
49 {
50 struct dst_entry *ndst;
51 struct flowi6 fl6 = { { 0 } };
52
53 memset(&fl6, 0, sizeof(fl6));
54 fl6.flowi6_oif = ndev->ifindex;
55 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
56 memcpy(&fl6.daddr, daddr, sizeof(*daddr));
57 fl6.flowi6_proto = IPPROTO_UDP;
58
59 ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
60 recv_sockets.sk6->sk, &fl6,
61 NULL);
62 if (IS_ERR(ndst)) {
63 pr_err_ratelimited("no route to %pI6\n", daddr);
64 return NULL;
65 }
66
67 if (unlikely(ndst->error)) {
68 pr_err("no route to %pI6\n", daddr);
69 goto put;
70 }
71
72 return ndst;
73 put:
74 dst_release(ndst);
75 return NULL;
76 }
77
78 #else
79
rxe_find_route6(struct net_device * ndev,struct in6_addr * saddr,struct in6_addr * daddr)80 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
81 struct in6_addr *saddr,
82 struct in6_addr *daddr)
83 {
84 return NULL;
85 }
86
87 #endif
88
rxe_find_route(struct net_device * ndev,struct rxe_qp * qp,struct rxe_av * av)89 static struct dst_entry *rxe_find_route(struct net_device *ndev,
90 struct rxe_qp *qp,
91 struct rxe_av *av)
92 {
93 struct dst_entry *dst = NULL;
94
95 if (qp_type(qp) == IB_QPT_RC)
96 dst = sk_dst_get(qp->sk->sk);
97
98 if (!dst || !dst_check(dst, qp->dst_cookie)) {
99 if (dst)
100 dst_release(dst);
101
102 if (av->network_type == RXE_NETWORK_TYPE_IPV4) {
103 struct in_addr *saddr;
104 struct in_addr *daddr;
105
106 saddr = &av->sgid_addr._sockaddr_in.sin_addr;
107 daddr = &av->dgid_addr._sockaddr_in.sin_addr;
108 dst = rxe_find_route4(ndev, saddr, daddr);
109 } else if (av->network_type == RXE_NETWORK_TYPE_IPV6) {
110 struct in6_addr *saddr6;
111 struct in6_addr *daddr6;
112
113 saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
114 daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
115 dst = rxe_find_route6(ndev, saddr6, daddr6);
116 #if IS_ENABLED(CONFIG_IPV6)
117 if (dst)
118 qp->dst_cookie =
119 rt6_get_cookie((struct rt6_info *)dst);
120 #endif
121 }
122
123 if (dst && (qp_type(qp) == IB_QPT_RC)) {
124 dst_hold(dst);
125 sk_dst_set(qp->sk->sk, dst);
126 }
127 }
128 return dst;
129 }
130
rxe_udp_encap_recv(struct sock * sk,struct sk_buff * skb)131 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
132 {
133 struct udphdr *udph;
134 struct rxe_dev *rxe;
135 struct net_device *ndev = skb->dev;
136 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
137
138 /* takes a reference on rxe->ib_dev
139 * drop when skb is freed
140 */
141 rxe = rxe_get_dev_from_net(ndev);
142 if (!rxe && is_vlan_dev(ndev))
143 rxe = rxe_get_dev_from_net(vlan_dev_real_dev(ndev));
144 if (!rxe)
145 goto drop;
146
147 if (skb_linearize(skb)) {
148 ib_device_put(&rxe->ib_dev);
149 goto drop;
150 }
151
152 udph = udp_hdr(skb);
153 pkt->rxe = rxe;
154 pkt->port_num = 1;
155 pkt->hdr = (u8 *)(udph + 1);
156 pkt->mask = RXE_GRH_MASK;
157 pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
158
159 rxe_rcv(skb);
160
161 return 0;
162 drop:
163 kfree_skb(skb);
164
165 return 0;
166 }
167
rxe_setup_udp_tunnel(struct net * net,__be16 port,bool ipv6)168 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
169 bool ipv6)
170 {
171 int err;
172 struct socket *sock;
173 struct udp_port_cfg udp_cfg = { };
174 struct udp_tunnel_sock_cfg tnl_cfg = { };
175
176 if (ipv6) {
177 udp_cfg.family = AF_INET6;
178 udp_cfg.ipv6_v6only = 1;
179 } else {
180 udp_cfg.family = AF_INET;
181 }
182
183 udp_cfg.local_udp_port = port;
184
185 /* Create UDP socket */
186 err = udp_sock_create(net, &udp_cfg, &sock);
187 if (err < 0)
188 return ERR_PTR(err);
189
190 tnl_cfg.encap_type = 1;
191 tnl_cfg.encap_rcv = rxe_udp_encap_recv;
192
193 /* Setup UDP tunnel */
194 setup_udp_tunnel_sock(net, sock, &tnl_cfg);
195
196 return sock;
197 }
198
rxe_release_udp_tunnel(struct socket * sk)199 static void rxe_release_udp_tunnel(struct socket *sk)
200 {
201 if (sk)
202 udp_tunnel_sock_release(sk);
203 }
204
prepare_udp_hdr(struct sk_buff * skb,__be16 src_port,__be16 dst_port)205 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
206 __be16 dst_port)
207 {
208 struct udphdr *udph;
209
210 __skb_push(skb, sizeof(*udph));
211 skb_reset_transport_header(skb);
212 udph = udp_hdr(skb);
213
214 udph->dest = dst_port;
215 udph->source = src_port;
216 udph->len = htons(skb->len);
217 udph->check = 0;
218 }
219
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)220 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
221 __be32 saddr, __be32 daddr, __u8 proto,
222 __u8 tos, __u8 ttl, __be16 df, bool xnet)
223 {
224 struct iphdr *iph;
225
226 skb_scrub_packet(skb, xnet);
227
228 skb_clear_hash(skb);
229 skb_dst_set(skb, dst_clone(dst));
230 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
231
232 skb_push(skb, sizeof(struct iphdr));
233 skb_reset_network_header(skb);
234
235 iph = ip_hdr(skb);
236
237 iph->version = IPVERSION;
238 iph->ihl = sizeof(struct iphdr) >> 2;
239 iph->tot_len = htons(skb->len);
240 iph->frag_off = df;
241 iph->protocol = proto;
242 iph->tos = tos;
243 iph->daddr = daddr;
244 iph->saddr = saddr;
245 iph->ttl = ttl;
246 __ip_select_ident(dev_net(dst->dev), iph,
247 skb_shinfo(skb)->gso_segs ?: 1);
248 }
249
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)250 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
251 struct in6_addr *saddr, struct in6_addr *daddr,
252 __u8 proto, __u8 prio, __u8 ttl)
253 {
254 struct ipv6hdr *ip6h;
255
256 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
257 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
258 | IPSKB_REROUTED);
259 skb_dst_set(skb, dst_clone(dst));
260
261 __skb_push(skb, sizeof(*ip6h));
262 skb_reset_network_header(skb);
263 ip6h = ipv6_hdr(skb);
264 ip6_flow_hdr(ip6h, prio, htonl(0));
265 ip6h->payload_len = htons(skb->len);
266 ip6h->nexthdr = proto;
267 ip6h->hop_limit = ttl;
268 ip6h->daddr = *daddr;
269 ip6h->saddr = *saddr;
270 ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
271 }
272
prepare4(struct rxe_av * av,struct rxe_pkt_info * pkt,struct sk_buff * skb)273 static int prepare4(struct rxe_av *av, struct rxe_pkt_info *pkt,
274 struct sk_buff *skb)
275 {
276 struct rxe_qp *qp = pkt->qp;
277 struct dst_entry *dst;
278 bool xnet = false;
279 __be16 df = htons(IP_DF);
280 struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
281 struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
282
283 dst = rxe_find_route(skb->dev, qp, av);
284 if (!dst) {
285 pr_err("Host not reachable\n");
286 return -EHOSTUNREACH;
287 }
288
289 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
290 cpu_to_be16(ROCE_V2_UDP_DPORT));
291
292 prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
293 av->grh.traffic_class, av->grh.hop_limit, df, xnet);
294
295 dst_release(dst);
296 return 0;
297 }
298
prepare6(struct rxe_av * av,struct rxe_pkt_info * pkt,struct sk_buff * skb)299 static int prepare6(struct rxe_av *av, struct rxe_pkt_info *pkt,
300 struct sk_buff *skb)
301 {
302 struct rxe_qp *qp = pkt->qp;
303 struct dst_entry *dst;
304 struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
305 struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
306
307 dst = rxe_find_route(skb->dev, qp, av);
308 if (!dst) {
309 pr_err("Host not reachable\n");
310 return -EHOSTUNREACH;
311 }
312
313 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
314 cpu_to_be16(ROCE_V2_UDP_DPORT));
315
316 prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
317 av->grh.traffic_class,
318 av->grh.hop_limit);
319
320 dst_release(dst);
321 return 0;
322 }
323
rxe_prepare(struct rxe_av * av,struct rxe_pkt_info * pkt,struct sk_buff * skb)324 int rxe_prepare(struct rxe_av *av, struct rxe_pkt_info *pkt,
325 struct sk_buff *skb)
326 {
327 int err = 0;
328
329 if (skb->protocol == htons(ETH_P_IP))
330 err = prepare4(av, pkt, skb);
331 else if (skb->protocol == htons(ETH_P_IPV6))
332 err = prepare6(av, pkt, skb);
333
334 if (ether_addr_equal(skb->dev->dev_addr, av->dmac))
335 pkt->mask |= RXE_LOOPBACK_MASK;
336
337 return err;
338 }
339
rxe_skb_tx_dtor(struct sk_buff * skb)340 static void rxe_skb_tx_dtor(struct sk_buff *skb)
341 {
342 struct sock *sk = skb->sk;
343 struct rxe_qp *qp = sk->sk_user_data;
344 int skb_out = atomic_dec_return(&qp->skb_out);
345
346 if (unlikely(qp->need_req_skb &&
347 skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
348 rxe_run_task(&qp->req.task, 1);
349
350 rxe_put(qp);
351 }
352
rxe_send(struct sk_buff * skb,struct rxe_pkt_info * pkt)353 static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)
354 {
355 int err;
356
357 skb->destructor = rxe_skb_tx_dtor;
358 skb->sk = pkt->qp->sk->sk;
359
360 rxe_get(pkt->qp);
361 atomic_inc(&pkt->qp->skb_out);
362
363 if (skb->protocol == htons(ETH_P_IP)) {
364 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
365 } else if (skb->protocol == htons(ETH_P_IPV6)) {
366 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
367 } else {
368 pr_err("Unknown layer 3 protocol: %d\n", skb->protocol);
369 atomic_dec(&pkt->qp->skb_out);
370 rxe_put(pkt->qp);
371 kfree_skb(skb);
372 return -EINVAL;
373 }
374
375 if (unlikely(net_xmit_eval(err))) {
376 pr_debug("error sending packet: %d\n", err);
377 return -EAGAIN;
378 }
379
380 return 0;
381 }
382
383 /* fix up a send packet to match the packets
384 * received from UDP before looping them back
385 */
rxe_loopback(struct sk_buff * skb,struct rxe_pkt_info * pkt)386 static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)
387 {
388 memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt));
389
390 if (skb->protocol == htons(ETH_P_IP))
391 skb_pull(skb, sizeof(struct iphdr));
392 else
393 skb_pull(skb, sizeof(struct ipv6hdr));
394
395 if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) {
396 kfree_skb(skb);
397 return -EIO;
398 }
399
400 rxe_rcv(skb);
401
402 return 0;
403 }
404
rxe_xmit_packet(struct rxe_qp * qp,struct rxe_pkt_info * pkt,struct sk_buff * skb)405 int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
406 struct sk_buff *skb)
407 {
408 int err;
409 int is_request = pkt->mask & RXE_REQ_MASK;
410 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
411
412 if ((is_request && (qp->req.state != QP_STATE_READY)) ||
413 (!is_request && (qp->resp.state != QP_STATE_READY))) {
414 pr_info("Packet dropped. QP is not in ready state\n");
415 goto drop;
416 }
417
418 rxe_icrc_generate(skb, pkt);
419
420 if (pkt->mask & RXE_LOOPBACK_MASK)
421 err = rxe_loopback(skb, pkt);
422 else
423 err = rxe_send(skb, pkt);
424 if (err) {
425 rxe_counter_inc(rxe, RXE_CNT_SEND_ERR);
426 return err;
427 }
428
429 if ((qp_type(qp) != IB_QPT_RC) &&
430 (pkt->mask & RXE_END_MASK)) {
431 pkt->wqe->state = wqe_state_done;
432 rxe_run_task(&qp->comp.task, 1);
433 }
434
435 rxe_counter_inc(rxe, RXE_CNT_SENT_PKTS);
436 goto done;
437
438 drop:
439 kfree_skb(skb);
440 err = 0;
441 done:
442 return err;
443 }
444
rxe_init_packet(struct rxe_dev * rxe,struct rxe_av * av,int paylen,struct rxe_pkt_info * pkt)445 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
446 int paylen, struct rxe_pkt_info *pkt)
447 {
448 unsigned int hdr_len;
449 struct sk_buff *skb = NULL;
450 struct net_device *ndev;
451 const struct ib_gid_attr *attr;
452 const int port_num = 1;
453
454 attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index);
455 if (IS_ERR(attr))
456 return NULL;
457
458 if (av->network_type == RXE_NETWORK_TYPE_IPV4)
459 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
460 sizeof(struct iphdr);
461 else
462 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
463 sizeof(struct ipv6hdr);
464
465 rcu_read_lock();
466 ndev = rdma_read_gid_attr_ndev_rcu(attr);
467 if (IS_ERR(ndev)) {
468 rcu_read_unlock();
469 goto out;
470 }
471 skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev),
472 GFP_ATOMIC);
473
474 if (unlikely(!skb)) {
475 rcu_read_unlock();
476 goto out;
477 }
478
479 skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));
480
481 /* FIXME: hold reference to this netdev until life of this skb. */
482 skb->dev = ndev;
483 rcu_read_unlock();
484
485 if (av->network_type == RXE_NETWORK_TYPE_IPV4)
486 skb->protocol = htons(ETH_P_IP);
487 else
488 skb->protocol = htons(ETH_P_IPV6);
489
490 pkt->rxe = rxe;
491 pkt->port_num = port_num;
492 pkt->hdr = skb_put(skb, paylen);
493 pkt->mask |= RXE_GRH_MASK;
494
495 out:
496 rdma_put_gid_attr(attr);
497 return skb;
498 }
499
500 /*
501 * this is required by rxe_cfg to match rxe devices in
502 * /sys/class/infiniband up with their underlying ethernet devices
503 */
rxe_parent_name(struct rxe_dev * rxe,unsigned int port_num)504 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
505 {
506 return rxe->ndev->name;
507 }
508
rxe_net_add(const char * ibdev_name,struct net_device * ndev)509 int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
510 {
511 int err;
512 struct rxe_dev *rxe = NULL;
513
514 rxe = ib_alloc_device(rxe_dev, ib_dev);
515 if (!rxe)
516 return -ENOMEM;
517
518 rxe->ndev = ndev;
519
520 err = rxe_add(rxe, ndev->mtu, ibdev_name);
521 if (err) {
522 ib_dealloc_device(&rxe->ib_dev);
523 return err;
524 }
525
526 return 0;
527 }
528
rxe_port_event(struct rxe_dev * rxe,enum ib_event_type event)529 static void rxe_port_event(struct rxe_dev *rxe,
530 enum ib_event_type event)
531 {
532 struct ib_event ev;
533
534 ev.device = &rxe->ib_dev;
535 ev.element.port_num = 1;
536 ev.event = event;
537
538 ib_dispatch_event(&ev);
539 }
540
541 /* Caller must hold net_info_lock */
rxe_port_up(struct rxe_dev * rxe)542 void rxe_port_up(struct rxe_dev *rxe)
543 {
544 struct rxe_port *port;
545
546 port = &rxe->port;
547 port->attr.state = IB_PORT_ACTIVE;
548
549 rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
550 dev_info(&rxe->ib_dev.dev, "set active\n");
551 }
552
553 /* Caller must hold net_info_lock */
rxe_port_down(struct rxe_dev * rxe)554 void rxe_port_down(struct rxe_dev *rxe)
555 {
556 struct rxe_port *port;
557
558 port = &rxe->port;
559 port->attr.state = IB_PORT_DOWN;
560
561 rxe_port_event(rxe, IB_EVENT_PORT_ERR);
562 rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
563 dev_info(&rxe->ib_dev.dev, "set down\n");
564 }
565
rxe_set_port_state(struct rxe_dev * rxe)566 void rxe_set_port_state(struct rxe_dev *rxe)
567 {
568 if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev))
569 rxe_port_up(rxe);
570 else
571 rxe_port_down(rxe);
572 }
573
rxe_notify(struct notifier_block * not_blk,unsigned long event,void * arg)574 static int rxe_notify(struct notifier_block *not_blk,
575 unsigned long event,
576 void *arg)
577 {
578 struct net_device *ndev = netdev_notifier_info_to_dev(arg);
579 struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
580
581 if (!rxe)
582 return NOTIFY_OK;
583
584 switch (event) {
585 case NETDEV_UNREGISTER:
586 ib_unregister_device_queued(&rxe->ib_dev);
587 break;
588 case NETDEV_UP:
589 rxe_port_up(rxe);
590 break;
591 case NETDEV_DOWN:
592 rxe_port_down(rxe);
593 break;
594 case NETDEV_CHANGEMTU:
595 pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu);
596 rxe_set_mtu(rxe, ndev->mtu);
597 break;
598 case NETDEV_CHANGE:
599 rxe_set_port_state(rxe);
600 break;
601 case NETDEV_REBOOT:
602 case NETDEV_GOING_DOWN:
603 case NETDEV_CHANGEADDR:
604 case NETDEV_CHANGENAME:
605 case NETDEV_FEAT_CHANGE:
606 default:
607 pr_info("ignoring netdev event = %ld for %s\n",
608 event, ndev->name);
609 break;
610 }
611
612 ib_device_put(&rxe->ib_dev);
613 return NOTIFY_OK;
614 }
615
616 static struct notifier_block rxe_net_notifier = {
617 .notifier_call = rxe_notify,
618 };
619
rxe_net_ipv4_init(void)620 static int rxe_net_ipv4_init(void)
621 {
622 recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
623 htons(ROCE_V2_UDP_DPORT), false);
624 if (IS_ERR(recv_sockets.sk4)) {
625 recv_sockets.sk4 = NULL;
626 pr_err("Failed to create IPv4 UDP tunnel\n");
627 return -1;
628 }
629
630 return 0;
631 }
632
rxe_net_ipv6_init(void)633 static int rxe_net_ipv6_init(void)
634 {
635 #if IS_ENABLED(CONFIG_IPV6)
636
637 recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
638 htons(ROCE_V2_UDP_DPORT), true);
639 if (PTR_ERR(recv_sockets.sk6) == -EAFNOSUPPORT) {
640 recv_sockets.sk6 = NULL;
641 pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n");
642 return 0;
643 }
644
645 if (IS_ERR(recv_sockets.sk6)) {
646 recv_sockets.sk6 = NULL;
647 pr_err("Failed to create IPv6 UDP tunnel\n");
648 return -1;
649 }
650 #endif
651 return 0;
652 }
653
rxe_net_exit(void)654 void rxe_net_exit(void)
655 {
656 rxe_release_udp_tunnel(recv_sockets.sk6);
657 rxe_release_udp_tunnel(recv_sockets.sk4);
658 unregister_netdevice_notifier(&rxe_net_notifier);
659 }
660
rxe_net_init(void)661 int rxe_net_init(void)
662 {
663 int err;
664
665 recv_sockets.sk6 = NULL;
666
667 err = rxe_net_ipv4_init();
668 if (err)
669 return err;
670 err = rxe_net_ipv6_init();
671 if (err)
672 goto err_out;
673 err = register_netdevice_notifier(&rxe_net_notifier);
674 if (err) {
675 pr_err("Failed to register netdev notifier\n");
676 goto err_out;
677 }
678 return 0;
679 err_out:
680 rxe_net_exit();
681 return err;
682 }
683