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OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
0002 /*
0003  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
0004  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
0005  */
0006 
0007 #include <linux/skbuff.h>
0008 #include <linux/if_arp.h>
0009 #include <linux/netdevice.h>
0010 #include <linux/if.h>
0011 #include <linux/if_vlan.h>
0012 #include <net/udp_tunnel.h>
0013 #include <net/sch_generic.h>
0014 #include <linux/netfilter.h>
0015 #include <rdma/ib_addr.h>
0016 
0017 #include "rxe.h"
0018 #include "rxe_net.h"
0019 #include "rxe_loc.h"
0020 
0021 static struct rxe_recv_sockets recv_sockets;
0022 
0023 static struct dst_entry *rxe_find_route4(struct net_device *ndev,
0024                   struct in_addr *saddr,
0025                   struct in_addr *daddr)
0026 {
0027     struct rtable *rt;
0028     struct flowi4 fl = { { 0 } };
0029 
0030     memset(&fl, 0, sizeof(fl));
0031     fl.flowi4_oif = ndev->ifindex;
0032     memcpy(&fl.saddr, saddr, sizeof(*saddr));
0033     memcpy(&fl.daddr, daddr, sizeof(*daddr));
0034     fl.flowi4_proto = IPPROTO_UDP;
0035 
0036     rt = ip_route_output_key(&init_net, &fl);
0037     if (IS_ERR(rt)) {
0038         pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr);
0039         return NULL;
0040     }
0041 
0042     return &rt->dst;
0043 }
0044 
0045 #if IS_ENABLED(CONFIG_IPV6)
0046 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
0047                      struct in6_addr *saddr,
0048                      struct in6_addr *daddr)
0049 {
0050     struct dst_entry *ndst;
0051     struct flowi6 fl6 = { { 0 } };
0052 
0053     memset(&fl6, 0, sizeof(fl6));
0054     fl6.flowi6_oif = ndev->ifindex;
0055     memcpy(&fl6.saddr, saddr, sizeof(*saddr));
0056     memcpy(&fl6.daddr, daddr, sizeof(*daddr));
0057     fl6.flowi6_proto = IPPROTO_UDP;
0058 
0059     ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
0060                            recv_sockets.sk6->sk, &fl6,
0061                            NULL);
0062     if (IS_ERR(ndst)) {
0063         pr_err_ratelimited("no route to %pI6\n", daddr);
0064         return NULL;
0065     }
0066 
0067     if (unlikely(ndst->error)) {
0068         pr_err("no route to %pI6\n", daddr);
0069         goto put;
0070     }
0071 
0072     return ndst;
0073 put:
0074     dst_release(ndst);
0075     return NULL;
0076 }
0077 
0078 #else
0079 
0080 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
0081                      struct in6_addr *saddr,
0082                      struct in6_addr *daddr)
0083 {
0084     return NULL;
0085 }
0086 
0087 #endif
0088 
0089 static struct dst_entry *rxe_find_route(struct net_device *ndev,
0090                     struct rxe_qp *qp,
0091                     struct rxe_av *av)
0092 {
0093     struct dst_entry *dst = NULL;
0094 
0095     if (qp_type(qp) == IB_QPT_RC)
0096         dst = sk_dst_get(qp->sk->sk);
0097 
0098     if (!dst || !dst_check(dst, qp->dst_cookie)) {
0099         if (dst)
0100             dst_release(dst);
0101 
0102         if (av->network_type == RXE_NETWORK_TYPE_IPV4) {
0103             struct in_addr *saddr;
0104             struct in_addr *daddr;
0105 
0106             saddr = &av->sgid_addr._sockaddr_in.sin_addr;
0107             daddr = &av->dgid_addr._sockaddr_in.sin_addr;
0108             dst = rxe_find_route4(ndev, saddr, daddr);
0109         } else if (av->network_type == RXE_NETWORK_TYPE_IPV6) {
0110             struct in6_addr *saddr6;
0111             struct in6_addr *daddr6;
0112 
0113             saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
0114             daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
0115             dst = rxe_find_route6(ndev, saddr6, daddr6);
0116 #if IS_ENABLED(CONFIG_IPV6)
0117             if (dst)
0118                 qp->dst_cookie =
0119                     rt6_get_cookie((struct rt6_info *)dst);
0120 #endif
0121         }
0122 
0123         if (dst && (qp_type(qp) == IB_QPT_RC)) {
0124             dst_hold(dst);
0125             sk_dst_set(qp->sk->sk, dst);
0126         }
0127     }
0128     return dst;
0129 }
0130 
0131 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
0132 {
0133     struct udphdr *udph;
0134     struct rxe_dev *rxe;
0135     struct net_device *ndev = skb->dev;
0136     struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
0137 
0138     /* takes a reference on rxe->ib_dev
0139      * drop when skb is freed
0140      */
0141     rxe = rxe_get_dev_from_net(ndev);
0142     if (!rxe && is_vlan_dev(ndev))
0143         rxe = rxe_get_dev_from_net(vlan_dev_real_dev(ndev));
0144     if (!rxe)
0145         goto drop;
0146 
0147     if (skb_linearize(skb)) {
0148         pr_err("skb_linearize failed\n");
0149         ib_device_put(&rxe->ib_dev);
0150         goto drop;
0151     }
0152 
0153     udph = udp_hdr(skb);
0154     pkt->rxe = rxe;
0155     pkt->port_num = 1;
0156     pkt->hdr = (u8 *)(udph + 1);
0157     pkt->mask = RXE_GRH_MASK;
0158     pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
0159 
0160     rxe_rcv(skb);
0161 
0162     return 0;
0163 drop:
0164     kfree_skb(skb);
0165 
0166     return 0;
0167 }
0168 
0169 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
0170                        bool ipv6)
0171 {
0172     int err;
0173     struct socket *sock;
0174     struct udp_port_cfg udp_cfg = { };
0175     struct udp_tunnel_sock_cfg tnl_cfg = { };
0176 
0177     if (ipv6) {
0178         udp_cfg.family = AF_INET6;
0179         udp_cfg.ipv6_v6only = 1;
0180     } else {
0181         udp_cfg.family = AF_INET;
0182     }
0183 
0184     udp_cfg.local_udp_port = port;
0185 
0186     /* Create UDP socket */
0187     err = udp_sock_create(net, &udp_cfg, &sock);
0188     if (err < 0)
0189         return ERR_PTR(err);
0190 
0191     tnl_cfg.encap_type = 1;
0192     tnl_cfg.encap_rcv = rxe_udp_encap_recv;
0193 
0194     /* Setup UDP tunnel */
0195     setup_udp_tunnel_sock(net, sock, &tnl_cfg);
0196 
0197     return sock;
0198 }
0199 
0200 static void rxe_release_udp_tunnel(struct socket *sk)
0201 {
0202     if (sk)
0203         udp_tunnel_sock_release(sk);
0204 }
0205 
0206 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
0207                 __be16 dst_port)
0208 {
0209     struct udphdr *udph;
0210 
0211     __skb_push(skb, sizeof(*udph));
0212     skb_reset_transport_header(skb);
0213     udph = udp_hdr(skb);
0214 
0215     udph->dest = dst_port;
0216     udph->source = src_port;
0217     udph->len = htons(skb->len);
0218     udph->check = 0;
0219 }
0220 
0221 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
0222                  __be32 saddr, __be32 daddr, __u8 proto,
0223                  __u8 tos, __u8 ttl, __be16 df, bool xnet)
0224 {
0225     struct iphdr *iph;
0226 
0227     skb_scrub_packet(skb, xnet);
0228 
0229     skb_clear_hash(skb);
0230     skb_dst_set(skb, dst_clone(dst));
0231     memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
0232 
0233     skb_push(skb, sizeof(struct iphdr));
0234     skb_reset_network_header(skb);
0235 
0236     iph = ip_hdr(skb);
0237 
0238     iph->version    =   IPVERSION;
0239     iph->ihl    =   sizeof(struct iphdr) >> 2;
0240     iph->tot_len    =   htons(skb->len);
0241     iph->frag_off   =   df;
0242     iph->protocol   =   proto;
0243     iph->tos    =   tos;
0244     iph->daddr  =   daddr;
0245     iph->saddr  =   saddr;
0246     iph->ttl    =   ttl;
0247     __ip_select_ident(dev_net(dst->dev), iph,
0248               skb_shinfo(skb)->gso_segs ?: 1);
0249 }
0250 
0251 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
0252                  struct in6_addr *saddr, struct in6_addr *daddr,
0253                  __u8 proto, __u8 prio, __u8 ttl)
0254 {
0255     struct ipv6hdr *ip6h;
0256 
0257     memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
0258     IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
0259                 | IPSKB_REROUTED);
0260     skb_dst_set(skb, dst_clone(dst));
0261 
0262     __skb_push(skb, sizeof(*ip6h));
0263     skb_reset_network_header(skb);
0264     ip6h          = ipv6_hdr(skb);
0265     ip6_flow_hdr(ip6h, prio, htonl(0));
0266     ip6h->payload_len = htons(skb->len);
0267     ip6h->nexthdr     = proto;
0268     ip6h->hop_limit   = ttl;
0269     ip6h->daddr   = *daddr;
0270     ip6h->saddr   = *saddr;
0271     ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
0272 }
0273 
0274 static int prepare4(struct rxe_av *av, struct rxe_pkt_info *pkt,
0275             struct sk_buff *skb)
0276 {
0277     struct rxe_qp *qp = pkt->qp;
0278     struct dst_entry *dst;
0279     bool xnet = false;
0280     __be16 df = htons(IP_DF);
0281     struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
0282     struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
0283 
0284     dst = rxe_find_route(skb->dev, qp, av);
0285     if (!dst) {
0286         pr_err("Host not reachable\n");
0287         return -EHOSTUNREACH;
0288     }
0289 
0290     prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
0291             cpu_to_be16(ROCE_V2_UDP_DPORT));
0292 
0293     prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
0294              av->grh.traffic_class, av->grh.hop_limit, df, xnet);
0295 
0296     dst_release(dst);
0297     return 0;
0298 }
0299 
0300 static int prepare6(struct rxe_av *av, struct rxe_pkt_info *pkt,
0301             struct sk_buff *skb)
0302 {
0303     struct rxe_qp *qp = pkt->qp;
0304     struct dst_entry *dst;
0305     struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
0306     struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
0307 
0308     dst = rxe_find_route(skb->dev, qp, av);
0309     if (!dst) {
0310         pr_err("Host not reachable\n");
0311         return -EHOSTUNREACH;
0312     }
0313 
0314     prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
0315             cpu_to_be16(ROCE_V2_UDP_DPORT));
0316 
0317     prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
0318              av->grh.traffic_class,
0319              av->grh.hop_limit);
0320 
0321     dst_release(dst);
0322     return 0;
0323 }
0324 
0325 int rxe_prepare(struct rxe_av *av, struct rxe_pkt_info *pkt,
0326         struct sk_buff *skb)
0327 {
0328     int err = 0;
0329 
0330     if (skb->protocol == htons(ETH_P_IP))
0331         err = prepare4(av, pkt, skb);
0332     else if (skb->protocol == htons(ETH_P_IPV6))
0333         err = prepare6(av, pkt, skb);
0334 
0335     if (ether_addr_equal(skb->dev->dev_addr, av->dmac))
0336         pkt->mask |= RXE_LOOPBACK_MASK;
0337 
0338     return err;
0339 }
0340 
0341 static void rxe_skb_tx_dtor(struct sk_buff *skb)
0342 {
0343     struct sock *sk = skb->sk;
0344     struct rxe_qp *qp = sk->sk_user_data;
0345     int skb_out = atomic_dec_return(&qp->skb_out);
0346 
0347     if (unlikely(qp->need_req_skb &&
0348              skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
0349         rxe_run_task(&qp->req.task, 1);
0350 
0351     rxe_put(qp);
0352 }
0353 
0354 static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)
0355 {
0356     int err;
0357 
0358     skb->destructor = rxe_skb_tx_dtor;
0359     skb->sk = pkt->qp->sk->sk;
0360 
0361     rxe_get(pkt->qp);
0362     atomic_inc(&pkt->qp->skb_out);
0363 
0364     if (skb->protocol == htons(ETH_P_IP)) {
0365         err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
0366     } else if (skb->protocol == htons(ETH_P_IPV6)) {
0367         err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
0368     } else {
0369         pr_err("Unknown layer 3 protocol: %d\n", skb->protocol);
0370         atomic_dec(&pkt->qp->skb_out);
0371         rxe_put(pkt->qp);
0372         kfree_skb(skb);
0373         return -EINVAL;
0374     }
0375 
0376     if (unlikely(net_xmit_eval(err))) {
0377         pr_debug("error sending packet: %d\n", err);
0378         return -EAGAIN;
0379     }
0380 
0381     return 0;
0382 }
0383 
0384 /* fix up a send packet to match the packets
0385  * received from UDP before looping them back
0386  */
0387 static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)
0388 {
0389     memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt));
0390 
0391     if (skb->protocol == htons(ETH_P_IP))
0392         skb_pull(skb, sizeof(struct iphdr));
0393     else
0394         skb_pull(skb, sizeof(struct ipv6hdr));
0395 
0396     if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) {
0397         kfree_skb(skb);
0398         return -EIO;
0399     }
0400 
0401     rxe_rcv(skb);
0402 
0403     return 0;
0404 }
0405 
0406 int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
0407             struct sk_buff *skb)
0408 {
0409     int err;
0410     int is_request = pkt->mask & RXE_REQ_MASK;
0411     struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
0412 
0413     if ((is_request && (qp->req.state != QP_STATE_READY)) ||
0414         (!is_request && (qp->resp.state != QP_STATE_READY))) {
0415         pr_info("Packet dropped. QP is not in ready state\n");
0416         goto drop;
0417     }
0418 
0419     rxe_icrc_generate(skb, pkt);
0420 
0421     if (pkt->mask & RXE_LOOPBACK_MASK)
0422         err = rxe_loopback(skb, pkt);
0423     else
0424         err = rxe_send(skb, pkt);
0425     if (err) {
0426         rxe_counter_inc(rxe, RXE_CNT_SEND_ERR);
0427         return err;
0428     }
0429 
0430     if ((qp_type(qp) != IB_QPT_RC) &&
0431         (pkt->mask & RXE_END_MASK)) {
0432         pkt->wqe->state = wqe_state_done;
0433         rxe_run_task(&qp->comp.task, 1);
0434     }
0435 
0436     rxe_counter_inc(rxe, RXE_CNT_SENT_PKTS);
0437     goto done;
0438 
0439 drop:
0440     kfree_skb(skb);
0441     err = 0;
0442 done:
0443     return err;
0444 }
0445 
0446 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
0447                 int paylen, struct rxe_pkt_info *pkt)
0448 {
0449     unsigned int hdr_len;
0450     struct sk_buff *skb = NULL;
0451     struct net_device *ndev;
0452     const struct ib_gid_attr *attr;
0453     const int port_num = 1;
0454 
0455     attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index);
0456     if (IS_ERR(attr))
0457         return NULL;
0458 
0459     if (av->network_type == RXE_NETWORK_TYPE_IPV4)
0460         hdr_len = ETH_HLEN + sizeof(struct udphdr) +
0461             sizeof(struct iphdr);
0462     else
0463         hdr_len = ETH_HLEN + sizeof(struct udphdr) +
0464             sizeof(struct ipv6hdr);
0465 
0466     rcu_read_lock();
0467     ndev = rdma_read_gid_attr_ndev_rcu(attr);
0468     if (IS_ERR(ndev)) {
0469         rcu_read_unlock();
0470         goto out;
0471     }
0472     skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev),
0473             GFP_ATOMIC);
0474 
0475     if (unlikely(!skb)) {
0476         rcu_read_unlock();
0477         goto out;
0478     }
0479 
0480     skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));
0481 
0482     /* FIXME: hold reference to this netdev until life of this skb. */
0483     skb->dev    = ndev;
0484     rcu_read_unlock();
0485 
0486     if (av->network_type == RXE_NETWORK_TYPE_IPV4)
0487         skb->protocol = htons(ETH_P_IP);
0488     else
0489         skb->protocol = htons(ETH_P_IPV6);
0490 
0491     pkt->rxe    = rxe;
0492     pkt->port_num   = port_num;
0493     pkt->hdr    = skb_put(skb, paylen);
0494     pkt->mask   |= RXE_GRH_MASK;
0495 
0496 out:
0497     rdma_put_gid_attr(attr);
0498     return skb;
0499 }
0500 
0501 /*
0502  * this is required by rxe_cfg to match rxe devices in
0503  * /sys/class/infiniband up with their underlying ethernet devices
0504  */
0505 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
0506 {
0507     return rxe->ndev->name;
0508 }
0509 
0510 int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
0511 {
0512     int err;
0513     struct rxe_dev *rxe = NULL;
0514 
0515     rxe = ib_alloc_device(rxe_dev, ib_dev);
0516     if (!rxe)
0517         return -ENOMEM;
0518 
0519     rxe->ndev = ndev;
0520 
0521     err = rxe_add(rxe, ndev->mtu, ibdev_name);
0522     if (err) {
0523         ib_dealloc_device(&rxe->ib_dev);
0524         return err;
0525     }
0526 
0527     return 0;
0528 }
0529 
0530 static void rxe_port_event(struct rxe_dev *rxe,
0531                enum ib_event_type event)
0532 {
0533     struct ib_event ev;
0534 
0535     ev.device = &rxe->ib_dev;
0536     ev.element.port_num = 1;
0537     ev.event = event;
0538 
0539     ib_dispatch_event(&ev);
0540 }
0541 
0542 /* Caller must hold net_info_lock */
0543 void rxe_port_up(struct rxe_dev *rxe)
0544 {
0545     struct rxe_port *port;
0546 
0547     port = &rxe->port;
0548     port->attr.state = IB_PORT_ACTIVE;
0549 
0550     rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
0551     dev_info(&rxe->ib_dev.dev, "set active\n");
0552 }
0553 
0554 /* Caller must hold net_info_lock */
0555 void rxe_port_down(struct rxe_dev *rxe)
0556 {
0557     struct rxe_port *port;
0558 
0559     port = &rxe->port;
0560     port->attr.state = IB_PORT_DOWN;
0561 
0562     rxe_port_event(rxe, IB_EVENT_PORT_ERR);
0563     rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
0564     dev_info(&rxe->ib_dev.dev, "set down\n");
0565 }
0566 
0567 void rxe_set_port_state(struct rxe_dev *rxe)
0568 {
0569     if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev))
0570         rxe_port_up(rxe);
0571     else
0572         rxe_port_down(rxe);
0573 }
0574 
0575 static int rxe_notify(struct notifier_block *not_blk,
0576               unsigned long event,
0577               void *arg)
0578 {
0579     struct net_device *ndev = netdev_notifier_info_to_dev(arg);
0580     struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
0581 
0582     if (!rxe)
0583         return NOTIFY_OK;
0584 
0585     switch (event) {
0586     case NETDEV_UNREGISTER:
0587         ib_unregister_device_queued(&rxe->ib_dev);
0588         break;
0589     case NETDEV_UP:
0590         rxe_port_up(rxe);
0591         break;
0592     case NETDEV_DOWN:
0593         rxe_port_down(rxe);
0594         break;
0595     case NETDEV_CHANGEMTU:
0596         pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu);
0597         rxe_set_mtu(rxe, ndev->mtu);
0598         break;
0599     case NETDEV_CHANGE:
0600         rxe_set_port_state(rxe);
0601         break;
0602     case NETDEV_REBOOT:
0603     case NETDEV_GOING_DOWN:
0604     case NETDEV_CHANGEADDR:
0605     case NETDEV_CHANGENAME:
0606     case NETDEV_FEAT_CHANGE:
0607     default:
0608         pr_info("ignoring netdev event = %ld for %s\n",
0609             event, ndev->name);
0610         break;
0611     }
0612 
0613     ib_device_put(&rxe->ib_dev);
0614     return NOTIFY_OK;
0615 }
0616 
0617 static struct notifier_block rxe_net_notifier = {
0618     .notifier_call = rxe_notify,
0619 };
0620 
0621 static int rxe_net_ipv4_init(void)
0622 {
0623     recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
0624                 htons(ROCE_V2_UDP_DPORT), false);
0625     if (IS_ERR(recv_sockets.sk4)) {
0626         recv_sockets.sk4 = NULL;
0627         pr_err("Failed to create IPv4 UDP tunnel\n");
0628         return -1;
0629     }
0630 
0631     return 0;
0632 }
0633 
0634 static int rxe_net_ipv6_init(void)
0635 {
0636 #if IS_ENABLED(CONFIG_IPV6)
0637 
0638     recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
0639                         htons(ROCE_V2_UDP_DPORT), true);
0640     if (PTR_ERR(recv_sockets.sk6) == -EAFNOSUPPORT) {
0641         recv_sockets.sk6 = NULL;
0642         pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n");
0643         return 0;
0644     }
0645 
0646     if (IS_ERR(recv_sockets.sk6)) {
0647         recv_sockets.sk6 = NULL;
0648         pr_err("Failed to create IPv6 UDP tunnel\n");
0649         return -1;
0650     }
0651 #endif
0652     return 0;
0653 }
0654 
0655 void rxe_net_exit(void)
0656 {
0657     rxe_release_udp_tunnel(recv_sockets.sk6);
0658     rxe_release_udp_tunnel(recv_sockets.sk4);
0659     unregister_netdevice_notifier(&rxe_net_notifier);
0660 }
0661 
0662 int rxe_net_init(void)
0663 {
0664     int err;
0665 
0666     recv_sockets.sk6 = NULL;
0667 
0668     err = rxe_net_ipv4_init();
0669     if (err)
0670         return err;
0671     err = rxe_net_ipv6_init();
0672     if (err)
0673         goto err_out;
0674     err = register_netdevice_notifier(&rxe_net_notifier);
0675     if (err) {
0676         pr_err("Failed to register netdev notifier\n");
0677         goto err_out;
0678     }
0679     return 0;
0680 err_out:
0681     rxe_net_exit();
0682     return err;
0683 }
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