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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
21static struct rxe_recv_sockets recv_sockets;
22
23int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
24{
25 int err;
26 unsigned char ll_addr[ETH_ALEN];
27
28 ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
29 err = dev_mc_add(rxe->ndev, ll_addr);
30
31 return err;
32}
33
34int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid)
35{
36 int err;
37 unsigned char ll_addr[ETH_ALEN];
38
39 ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
40 err = dev_mc_del(rxe->ndev, ll_addr);
41
42 return err;
43}
44
45static struct dst_entry *rxe_find_route4(struct net_device *ndev,
46 struct in_addr *saddr,
47 struct in_addr *daddr)
48{
49 struct rtable *rt;
50 struct flowi4 fl = { { 0 } };
51
52 memset(&fl, 0, sizeof(fl));
53 fl.flowi4_oif = ndev->ifindex;
54 memcpy(&fl.saddr, saddr, sizeof(*saddr));
55 memcpy(&fl.daddr, daddr, sizeof(*daddr));
56 fl.flowi4_proto = IPPROTO_UDP;
57
58 rt = ip_route_output_key(&init_net, &fl);
59 if (IS_ERR(rt)) {
60 pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr);
61 return NULL;
62 }
63
64 return &rt->dst;
65}
66
67#if IS_ENABLED(CONFIG_IPV6)
68static struct dst_entry *rxe_find_route6(struct net_device *ndev,
69 struct in6_addr *saddr,
70 struct in6_addr *daddr)
71{
72 struct dst_entry *ndst;
73 struct flowi6 fl6 = { { 0 } };
74
75 memset(&fl6, 0, sizeof(fl6));
76 fl6.flowi6_oif = ndev->ifindex;
77 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
78 memcpy(&fl6.daddr, daddr, sizeof(*daddr));
79 fl6.flowi6_proto = IPPROTO_UDP;
80
81 ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
82 recv_sockets.sk6->sk, &fl6,
83 NULL);
84 if (IS_ERR(ndst)) {
85 pr_err_ratelimited("no route to %pI6\n", daddr);
86 return NULL;
87 }
88
89 if (unlikely(ndst->error)) {
90 pr_err("no route to %pI6\n", daddr);
91 goto put;
92 }
93
94 return ndst;
95put:
96 dst_release(ndst);
97 return NULL;
98}
99
100#else
101
102static struct dst_entry *rxe_find_route6(struct net_device *ndev,
103 struct in6_addr *saddr,
104 struct in6_addr *daddr)
105{
106 return NULL;
107}
108
109#endif
110
111static struct dst_entry *rxe_find_route(struct net_device *ndev,
112 struct rxe_qp *qp,
113 struct rxe_av *av)
114{
115 struct dst_entry *dst = NULL;
116
117 if (qp_type(qp) == IB_QPT_RC)
118 dst = sk_dst_get(qp->sk->sk);
119
120 if (!dst || !dst_check(dst, qp->dst_cookie)) {
121 if (dst)
122 dst_release(dst);
123
124 if (av->network_type == RXE_NETWORK_TYPE_IPV4) {
125 struct in_addr *saddr;
126 struct in_addr *daddr;
127
128 saddr = &av->sgid_addr._sockaddr_in.sin_addr;
129 daddr = &av->dgid_addr._sockaddr_in.sin_addr;
130 dst = rxe_find_route4(ndev, saddr, daddr);
131 } else if (av->network_type == RXE_NETWORK_TYPE_IPV6) {
132 struct in6_addr *saddr6;
133 struct in6_addr *daddr6;
134
135 saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
136 daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
137 dst = rxe_find_route6(ndev, saddr6, daddr6);
138#if IS_ENABLED(CONFIG_IPV6)
139 if (dst)
140 qp->dst_cookie =
141 rt6_get_cookie((struct rt6_info *)dst);
142#endif
143 }
144
145 if (dst && (qp_type(qp) == IB_QPT_RC)) {
146 dst_hold(dst);
147 sk_dst_set(qp->sk->sk, dst);
148 }
149 }
150 return dst;
151}
152
153static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
154{
155 struct udphdr *udph;
156 struct rxe_dev *rxe;
157 struct net_device *ndev = skb->dev;
158 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
159
160
161
162
163 rxe = rxe_get_dev_from_net(ndev);
164 if (!rxe && is_vlan_dev(ndev))
165 rxe = rxe_get_dev_from_net(vlan_dev_real_dev(ndev));
166 if (!rxe)
167 goto drop;
168
169 if (skb_linearize(skb)) {
170 pr_err("skb_linearize failed\n");
171 ib_device_put(&rxe->ib_dev);
172 goto drop;
173 }
174
175 udph = udp_hdr(skb);
176 pkt->rxe = rxe;
177 pkt->port_num = 1;
178 pkt->hdr = (u8 *)(udph + 1);
179 pkt->mask = RXE_GRH_MASK;
180 pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
181
182 rxe_rcv(skb);
183
184 return 0;
185drop:
186 kfree_skb(skb);
187
188 return 0;
189}
190
191static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
192 bool ipv6)
193{
194 int err;
195 struct socket *sock;
196 struct udp_port_cfg udp_cfg = { };
197 struct udp_tunnel_sock_cfg tnl_cfg = { };
198
199 if (ipv6) {
200 udp_cfg.family = AF_INET6;
201 udp_cfg.ipv6_v6only = 1;
202 } else {
203 udp_cfg.family = AF_INET;
204 }
205
206 udp_cfg.local_udp_port = port;
207
208
209 err = udp_sock_create(net, &udp_cfg, &sock);
210 if (err < 0)
211 return ERR_PTR(err);
212
213 tnl_cfg.encap_type = 1;
214 tnl_cfg.encap_rcv = rxe_udp_encap_recv;
215
216
217 setup_udp_tunnel_sock(net, sock, &tnl_cfg);
218
219 return sock;
220}
221
222static void rxe_release_udp_tunnel(struct socket *sk)
223{
224 if (sk)
225 udp_tunnel_sock_release(sk);
226}
227
228static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
229 __be16 dst_port)
230{
231 struct udphdr *udph;
232
233 __skb_push(skb, sizeof(*udph));
234 skb_reset_transport_header(skb);
235 udph = udp_hdr(skb);
236
237 udph->dest = dst_port;
238 udph->source = src_port;
239 udph->len = htons(skb->len);
240 udph->check = 0;
241}
242
243static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
244 __be32 saddr, __be32 daddr, __u8 proto,
245 __u8 tos, __u8 ttl, __be16 df, bool xnet)
246{
247 struct iphdr *iph;
248
249 skb_scrub_packet(skb, xnet);
250
251 skb_clear_hash(skb);
252 skb_dst_set(skb, dst_clone(dst));
253 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
254
255 skb_push(skb, sizeof(struct iphdr));
256 skb_reset_network_header(skb);
257
258 iph = ip_hdr(skb);
259
260 iph->version = IPVERSION;
261 iph->ihl = sizeof(struct iphdr) >> 2;
262 iph->tot_len = htons(skb->len);
263 iph->frag_off = df;
264 iph->protocol = proto;
265 iph->tos = tos;
266 iph->daddr = daddr;
267 iph->saddr = saddr;
268 iph->ttl = ttl;
269 __ip_select_ident(dev_net(dst->dev), iph,
270 skb_shinfo(skb)->gso_segs ?: 1);
271}
272
273static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
274 struct in6_addr *saddr, struct in6_addr *daddr,
275 __u8 proto, __u8 prio, __u8 ttl)
276{
277 struct ipv6hdr *ip6h;
278
279 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
280 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
281 | IPSKB_REROUTED);
282 skb_dst_set(skb, dst_clone(dst));
283
284 __skb_push(skb, sizeof(*ip6h));
285 skb_reset_network_header(skb);
286 ip6h = ipv6_hdr(skb);
287 ip6_flow_hdr(ip6h, prio, htonl(0));
288 ip6h->payload_len = htons(skb->len);
289 ip6h->nexthdr = proto;
290 ip6h->hop_limit = ttl;
291 ip6h->daddr = *daddr;
292 ip6h->saddr = *saddr;
293 ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
294}
295
296static int prepare4(struct rxe_pkt_info *pkt, struct sk_buff *skb)
297{
298 struct rxe_qp *qp = pkt->qp;
299 struct dst_entry *dst;
300 bool xnet = false;
301 __be16 df = htons(IP_DF);
302 struct rxe_av *av = rxe_get_av(pkt);
303 struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
304 struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
305
306 dst = rxe_find_route(skb->dev, qp, av);
307 if (!dst) {
308 pr_err("Host not reachable\n");
309 return -EHOSTUNREACH;
310 }
311
312 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
313 cpu_to_be16(ROCE_V2_UDP_DPORT));
314
315 prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
316 av->grh.traffic_class, av->grh.hop_limit, df, xnet);
317
318 dst_release(dst);
319 return 0;
320}
321
322static int prepare6(struct rxe_pkt_info *pkt, struct sk_buff *skb)
323{
324 struct rxe_qp *qp = pkt->qp;
325 struct dst_entry *dst;
326 struct rxe_av *av = rxe_get_av(pkt);
327 struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
328 struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
329
330 dst = rxe_find_route(skb->dev, qp, av);
331 if (!dst) {
332 pr_err("Host not reachable\n");
333 return -EHOSTUNREACH;
334 }
335
336 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
337 cpu_to_be16(ROCE_V2_UDP_DPORT));
338
339 prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
340 av->grh.traffic_class,
341 av->grh.hop_limit);
342
343 dst_release(dst);
344 return 0;
345}
346
347int rxe_prepare(struct rxe_pkt_info *pkt, struct sk_buff *skb)
348{
349 int err = 0;
350
351 if (skb->protocol == htons(ETH_P_IP))
352 err = prepare4(pkt, skb);
353 else if (skb->protocol == htons(ETH_P_IPV6))
354 err = prepare6(pkt, skb);
355
356 if (ether_addr_equal(skb->dev->dev_addr, rxe_get_av(pkt)->dmac))
357 pkt->mask |= RXE_LOOPBACK_MASK;
358
359 return err;
360}
361
362static void rxe_skb_tx_dtor(struct sk_buff *skb)
363{
364 struct sock *sk = skb->sk;
365 struct rxe_qp *qp = sk->sk_user_data;
366 int skb_out = atomic_dec_return(&qp->skb_out);
367
368 if (unlikely(qp->need_req_skb &&
369 skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
370 rxe_run_task(&qp->req.task, 1);
371
372 rxe_drop_ref(qp);
373}
374
375static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)
376{
377 int err;
378
379 skb->destructor = rxe_skb_tx_dtor;
380 skb->sk = pkt->qp->sk->sk;
381
382 rxe_add_ref(pkt->qp);
383 atomic_inc(&pkt->qp->skb_out);
384
385 if (skb->protocol == htons(ETH_P_IP)) {
386 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
387 } else if (skb->protocol == htons(ETH_P_IPV6)) {
388 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
389 } else {
390 pr_err("Unknown layer 3 protocol: %d\n", skb->protocol);
391 atomic_dec(&pkt->qp->skb_out);
392 rxe_drop_ref(pkt->qp);
393 kfree_skb(skb);
394 return -EINVAL;
395 }
396
397 if (unlikely(net_xmit_eval(err))) {
398 pr_debug("error sending packet: %d\n", err);
399 return -EAGAIN;
400 }
401
402 return 0;
403}
404
405
406
407
408static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)
409{
410 memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt));
411
412 if (skb->protocol == htons(ETH_P_IP))
413 skb_pull(skb, sizeof(struct iphdr));
414 else
415 skb_pull(skb, sizeof(struct ipv6hdr));
416
417 if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) {
418 kfree_skb(skb);
419 return -EIO;
420 }
421
422 rxe_rcv(skb);
423
424 return 0;
425}
426
427int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
428 struct sk_buff *skb)
429{
430 int err;
431 int is_request = pkt->mask & RXE_REQ_MASK;
432 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
433
434 if ((is_request && (qp->req.state != QP_STATE_READY)) ||
435 (!is_request && (qp->resp.state != QP_STATE_READY))) {
436 pr_info("Packet dropped. QP is not in ready state\n");
437 goto drop;
438 }
439
440 rxe_icrc_generate(skb, pkt);
441
442 if (pkt->mask & RXE_LOOPBACK_MASK)
443 err = rxe_loopback(skb, pkt);
444 else
445 err = rxe_send(skb, pkt);
446 if (err) {
447 rxe->xmit_errors++;
448 rxe_counter_inc(rxe, RXE_CNT_SEND_ERR);
449 return err;
450 }
451
452 if ((qp_type(qp) != IB_QPT_RC) &&
453 (pkt->mask & RXE_END_MASK)) {
454 pkt->wqe->state = wqe_state_done;
455 rxe_run_task(&qp->comp.task, 1);
456 }
457
458 rxe_counter_inc(rxe, RXE_CNT_SENT_PKTS);
459 goto done;
460
461drop:
462 kfree_skb(skb);
463 err = 0;
464done:
465 return err;
466}
467
468struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
469 int paylen, struct rxe_pkt_info *pkt)
470{
471 unsigned int hdr_len;
472 struct sk_buff *skb = NULL;
473 struct net_device *ndev;
474 const struct ib_gid_attr *attr;
475 const int port_num = 1;
476
477 attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index);
478 if (IS_ERR(attr))
479 return NULL;
480
481 if (av->network_type == RXE_NETWORK_TYPE_IPV4)
482 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
483 sizeof(struct iphdr);
484 else
485 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
486 sizeof(struct ipv6hdr);
487
488 rcu_read_lock();
489 ndev = rdma_read_gid_attr_ndev_rcu(attr);
490 if (IS_ERR(ndev)) {
491 rcu_read_unlock();
492 goto out;
493 }
494 skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev),
495 GFP_ATOMIC);
496
497 if (unlikely(!skb)) {
498 rcu_read_unlock();
499 goto out;
500 }
501
502 skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));
503
504
505 skb->dev = ndev;
506 rcu_read_unlock();
507
508 if (av->network_type == RXE_NETWORK_TYPE_IPV4)
509 skb->protocol = htons(ETH_P_IP);
510 else
511 skb->protocol = htons(ETH_P_IPV6);
512
513 pkt->rxe = rxe;
514 pkt->port_num = port_num;
515 pkt->hdr = skb_put(skb, paylen);
516 pkt->mask |= RXE_GRH_MASK;
517
518out:
519 rdma_put_gid_attr(attr);
520 return skb;
521}
522
523
524
525
526
527const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
528{
529 return rxe->ndev->name;
530}
531
532int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
533{
534 int err;
535 struct rxe_dev *rxe = NULL;
536
537 rxe = ib_alloc_device(rxe_dev, ib_dev);
538 if (!rxe)
539 return -ENOMEM;
540
541 rxe->ndev = ndev;
542
543 err = rxe_add(rxe, ndev->mtu, ibdev_name);
544 if (err) {
545 ib_dealloc_device(&rxe->ib_dev);
546 return err;
547 }
548
549 return 0;
550}
551
552static void rxe_port_event(struct rxe_dev *rxe,
553 enum ib_event_type event)
554{
555 struct ib_event ev;
556
557 ev.device = &rxe->ib_dev;
558 ev.element.port_num = 1;
559 ev.event = event;
560
561 ib_dispatch_event(&ev);
562}
563
564
565void rxe_port_up(struct rxe_dev *rxe)
566{
567 struct rxe_port *port;
568
569 port = &rxe->port;
570 port->attr.state = IB_PORT_ACTIVE;
571
572 rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
573 dev_info(&rxe->ib_dev.dev, "set active\n");
574}
575
576
577void rxe_port_down(struct rxe_dev *rxe)
578{
579 struct rxe_port *port;
580
581 port = &rxe->port;
582 port->attr.state = IB_PORT_DOWN;
583
584 rxe_port_event(rxe, IB_EVENT_PORT_ERR);
585 rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
586 dev_info(&rxe->ib_dev.dev, "set down\n");
587}
588
589void rxe_set_port_state(struct rxe_dev *rxe)
590{
591 if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev))
592 rxe_port_up(rxe);
593 else
594 rxe_port_down(rxe);
595}
596
597static int rxe_notify(struct notifier_block *not_blk,
598 unsigned long event,
599 void *arg)
600{
601 struct net_device *ndev = netdev_notifier_info_to_dev(arg);
602 struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
603
604 if (!rxe)
605 return NOTIFY_OK;
606
607 switch (event) {
608 case NETDEV_UNREGISTER:
609 ib_unregister_device_queued(&rxe->ib_dev);
610 break;
611 case NETDEV_UP:
612 rxe_port_up(rxe);
613 break;
614 case NETDEV_DOWN:
615 rxe_port_down(rxe);
616 break;
617 case NETDEV_CHANGEMTU:
618 pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu);
619 rxe_set_mtu(rxe, ndev->mtu);
620 break;
621 case NETDEV_CHANGE:
622 rxe_set_port_state(rxe);
623 break;
624 case NETDEV_REBOOT:
625 case NETDEV_GOING_DOWN:
626 case NETDEV_CHANGEADDR:
627 case NETDEV_CHANGENAME:
628 case NETDEV_FEAT_CHANGE:
629 default:
630 pr_info("ignoring netdev event = %ld for %s\n",
631 event, ndev->name);
632 break;
633 }
634
635 ib_device_put(&rxe->ib_dev);
636 return NOTIFY_OK;
637}
638
639static struct notifier_block rxe_net_notifier = {
640 .notifier_call = rxe_notify,
641};
642
643static int rxe_net_ipv4_init(void)
644{
645 recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
646 htons(ROCE_V2_UDP_DPORT), false);
647 if (IS_ERR(recv_sockets.sk4)) {
648 recv_sockets.sk4 = NULL;
649 pr_err("Failed to create IPv4 UDP tunnel\n");
650 return -1;
651 }
652
653 return 0;
654}
655
656static int rxe_net_ipv6_init(void)
657{
658#if IS_ENABLED(CONFIG_IPV6)
659
660 recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
661 htons(ROCE_V2_UDP_DPORT), true);
662 if (PTR_ERR(recv_sockets.sk6) == -EAFNOSUPPORT) {
663 recv_sockets.sk6 = NULL;
664 pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n");
665 return 0;
666 }
667
668 if (IS_ERR(recv_sockets.sk6)) {
669 recv_sockets.sk6 = NULL;
670 pr_err("Failed to create IPv6 UDP tunnel\n");
671 return -1;
672 }
673#endif
674 return 0;
675}
676
677void rxe_net_exit(void)
678{
679 rxe_release_udp_tunnel(recv_sockets.sk6);
680 rxe_release_udp_tunnel(recv_sockets.sk4);
681 unregister_netdevice_notifier(&rxe_net_notifier);
682}
683
684int rxe_net_init(void)
685{
686 int err;
687
688 recv_sockets.sk6 = NULL;
689
690 err = rxe_net_ipv4_init();
691 if (err)
692 return err;
693 err = rxe_net_ipv6_init();
694 if (err)
695 goto err_out;
696 err = register_netdevice_notifier(&rxe_net_notifier);
697 if (err) {
698 pr_err("Failed to register netdev notifier\n");
699 goto err_out;
700 }
701 return 0;
702err_out:
703 rxe_net_exit();
704 return err;
705}
706
