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