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1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB2/*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 21static struct rxe_recv_sockets recv_sockets;22 23static 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)47static 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;75put:76 dst_release(ndst);77 return NULL;78}79 80#else81 82static 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#endif91 92static 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#endif124 }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 134static 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_dev142 * drop when skb is freed143 */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;168drop:169 kfree_skb(skb);170 171 return 0;172}173 174static 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 205static void rxe_release_udp_tunnel(struct socket *sk)206{207 if (sk)208 udp_tunnel_sock_release(sk);209}210 211static 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 226static 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 256static 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_TRANSFORMED264 | 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 279static 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 305static 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 330int 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 346static void rxe_skb_tx_dtor(struct sk_buff *skb)347{348 struct net_device *ndev = skb->dev;349 struct rxe_dev *rxe;350 unsigned int qp_index;351 struct rxe_qp *qp;352 int skb_out;353 354 rxe = rxe_get_dev_from_net(ndev);355 if (!rxe && is_vlan_dev(ndev))356 rxe = rxe_get_dev_from_net(vlan_dev_real_dev(ndev));357 if (WARN_ON(!rxe))358 return;359 360 qp_index = (int)(uintptr_t)skb->sk->sk_user_data;361 if (!qp_index)362 return;363 364 qp = rxe_pool_get_index(&rxe->qp_pool, qp_index);365 if (!qp)366 goto put_dev;367 368 skb_out = atomic_dec_return(&qp->skb_out);369 if (qp->need_req_skb && skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW)370 rxe_sched_task(&qp->send_task);371 372 rxe_put(qp);373put_dev:374 ib_device_put(&rxe->ib_dev);375 sock_put(skb->sk);376}377 378static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)379{380 int err;381 struct sock *sk = pkt->qp->sk->sk;382 383 sock_hold(sk);384 skb->sk = sk;385 skb->destructor = rxe_skb_tx_dtor;386 atomic_inc(&pkt->qp->skb_out);387 388 if (skb->protocol == htons(ETH_P_IP))389 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);390 else391 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);392 393 return err;394}395 396/* fix up a send packet to match the packets397 * received from UDP before looping them back398 */399static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)400{401 struct sock *sk = pkt->qp->sk->sk;402 403 memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt));404 405 sock_hold(sk);406 skb->sk = sk;407 skb->destructor = rxe_skb_tx_dtor;408 atomic_inc(&pkt->qp->skb_out);409 410 if (skb->protocol == htons(ETH_P_IP))411 skb_pull(skb, sizeof(struct iphdr));412 else413 skb_pull(skb, sizeof(struct ipv6hdr));414 415 if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) {416 kfree_skb(skb);417 return -EIO;418 }419 420 /* remove udp header */421 skb_pull(skb, sizeof(struct udphdr));422 423 rxe_rcv(skb);424 425 return 0;426}427 428int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,429 struct sk_buff *skb)430{431 int err;432 int is_request = pkt->mask & RXE_REQ_MASK;433 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);434 unsigned long flags;435 436 spin_lock_irqsave(&qp->state_lock, flags);437 if ((is_request && (qp_state(qp) < IB_QPS_RTS)) ||438 (!is_request && (qp_state(qp) < IB_QPS_RTR))) {439 spin_unlock_irqrestore(&qp->state_lock, flags);440 rxe_dbg_qp(qp, "Packet dropped. QP is not in ready state\n");441 goto drop;442 }443 spin_unlock_irqrestore(&qp->state_lock, flags);444 445 rxe_icrc_generate(skb, pkt);446 447 if (pkt->mask & RXE_LOOPBACK_MASK)448 err = rxe_loopback(skb, pkt);449 else450 err = rxe_send(skb, pkt);451 if (err) {452 rxe_counter_inc(rxe, RXE_CNT_SEND_ERR);453 return err;454 }455 456 rxe_counter_inc(rxe, RXE_CNT_SENT_PKTS);457 goto done;458 459drop:460 kfree_skb(skb);461 err = 0;462done:463 return err;464}465 466struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,467 int paylen, struct rxe_pkt_info *pkt)468{469 unsigned int hdr_len;470 struct sk_buff *skb = NULL;471 struct net_device *ndev;472 const struct ib_gid_attr *attr;473 const int port_num = 1;474 475 attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index);476 if (IS_ERR(attr))477 return NULL;478 479 if (av->network_type == RXE_NETWORK_TYPE_IPV4)480 hdr_len = ETH_HLEN + sizeof(struct udphdr) +481 sizeof(struct iphdr);482 else483 hdr_len = ETH_HLEN + sizeof(struct udphdr) +484 sizeof(struct ipv6hdr);485 486 rcu_read_lock();487 ndev = rdma_read_gid_attr_ndev_rcu(attr);488 if (IS_ERR(ndev)) {489 rcu_read_unlock();490 goto out;491 }492 skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev),493 GFP_ATOMIC);494 495 if (unlikely(!skb)) {496 rcu_read_unlock();497 goto out;498 }499 500 skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));501 502 /* FIXME: hold reference to this netdev until life of this skb. */503 skb->dev = ndev;504 rcu_read_unlock();505 506 if (av->network_type == RXE_NETWORK_TYPE_IPV4)507 skb->protocol = htons(ETH_P_IP);508 else509 skb->protocol = htons(ETH_P_IPV6);510 511 pkt->rxe = rxe;512 pkt->port_num = port_num;513 pkt->hdr = skb_put(skb, paylen);514 pkt->mask |= RXE_GRH_MASK;515 516out:517 rdma_put_gid_attr(attr);518 return skb;519}520 521/*522 * this is required by rxe_cfg to match rxe devices in523 * /sys/class/infiniband up with their underlying ethernet devices524 */525const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)526{527 return rxe->ndev->name;528}529 530int rxe_net_add(const char *ibdev_name, struct net_device *ndev)531{532 int err;533 struct rxe_dev *rxe = NULL;534 535 rxe = ib_alloc_device(rxe_dev, ib_dev);536 if (!rxe)537 return -ENOMEM;538 539 rxe->ndev = ndev;540 ib_mark_name_assigned_by_user(&rxe->ib_dev);541 542 err = rxe_add(rxe, ndev->mtu, ibdev_name);543 if (err) {544 ib_dealloc_device(&rxe->ib_dev);545 return err;546 }547 548 return 0;549}550 551static void rxe_port_event(struct rxe_dev *rxe,552 enum ib_event_type event)553{554 struct ib_event ev;555 556 ev.device = &rxe->ib_dev;557 ev.element.port_num = 1;558 ev.event = event;559 560 ib_dispatch_event(&ev);561}562 563/* Caller must hold net_info_lock */564void rxe_port_up(struct rxe_dev *rxe)565{566 struct rxe_port *port;567 568 port = &rxe->port;569 port->attr.state = IB_PORT_ACTIVE;570 571 rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);572 dev_info(&rxe->ib_dev.dev, "set active\n");573}574 575/* Caller must hold net_info_lock */576void rxe_port_down(struct rxe_dev *rxe)577{578 struct rxe_port *port;579 580 port = &rxe->port;581 port->attr.state = IB_PORT_DOWN;582 583 rxe_port_event(rxe, IB_EVENT_PORT_ERR);584 rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);585 dev_info(&rxe->ib_dev.dev, "set down\n");586}587 588void rxe_set_port_state(struct rxe_dev *rxe)589{590 if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev))591 rxe_port_up(rxe);592 else593 rxe_port_down(rxe);594}595 596static int rxe_notify(struct notifier_block *not_blk,597 unsigned long event,598 void *arg)599{600 struct net_device *ndev = netdev_notifier_info_to_dev(arg);601 struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);602 603 if (!rxe)604 return NOTIFY_OK;605 606 switch (event) {607 case NETDEV_UNREGISTER:608 ib_unregister_device_queued(&rxe->ib_dev);609 break;610 case NETDEV_UP:611 rxe_port_up(rxe);612 break;613 case NETDEV_DOWN:614 rxe_port_down(rxe);615 break;616 case NETDEV_CHANGEMTU:617 rxe_dbg_dev(rxe, "%s changed mtu to %d\n", ndev->name, ndev->mtu);618 rxe_set_mtu(rxe, ndev->mtu);619 break;620 case NETDEV_CHANGE:621 rxe_set_port_state(rxe);622 break;623 case NETDEV_REBOOT:624 case NETDEV_GOING_DOWN:625 case NETDEV_CHANGEADDR:626 case NETDEV_CHANGENAME:627 case NETDEV_FEAT_CHANGE:628 default:629 rxe_dbg_dev(rxe, "ignoring netdev event = %ld for %s\n",630 event, ndev->name);631 break;632 }633 634 ib_device_put(&rxe->ib_dev);635 return NOTIFY_OK;636}637 638static struct notifier_block rxe_net_notifier = {639 .notifier_call = rxe_notify,640};641 642static int rxe_net_ipv4_init(void)643{644 recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,645 htons(ROCE_V2_UDP_DPORT), false);646 if (IS_ERR(recv_sockets.sk4)) {647 recv_sockets.sk4 = NULL;648 pr_err("Failed to create IPv4 UDP tunnel\n");649 return -1;650 }651 652 return 0;653}654 655static int rxe_net_ipv6_init(void)656{657#if IS_ENABLED(CONFIG_IPV6)658 659 recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,660 htons(ROCE_V2_UDP_DPORT), true);661 if (PTR_ERR(recv_sockets.sk6) == -EAFNOSUPPORT) {662 recv_sockets.sk6 = NULL;663 pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n");664 return 0;665 }666 667 if (IS_ERR(recv_sockets.sk6)) {668 recv_sockets.sk6 = NULL;669 pr_err("Failed to create IPv6 UDP tunnel\n");670 return -1;671 }672#endif673 return 0;674}675 676void rxe_net_exit(void)677{678 rxe_release_udp_tunnel(recv_sockets.sk6);679 rxe_release_udp_tunnel(recv_sockets.sk4);680 unregister_netdevice_notifier(&rxe_net_notifier);681}682 683int rxe_net_init(void)684{685 int err;686 687 recv_sockets.sk6 = NULL;688 689 err = rxe_net_ipv4_init();690 if (err)691 return err;692 err = rxe_net_ipv6_init();693 if (err)694 goto err_out;695 err = register_netdevice_notifier(&rxe_net_notifier);696 if (err) {697 pr_err("Failed to register netdev notifier\n");698 goto err_out;699 }700 return 0;701err_out:702 rxe_net_exit();703 return err;704}705