2019-05-27 06:55:01 +00:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2016-04-04 13:00:34 +00:00
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/* Peer event handling, typically ICMP messages.
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2007-04-26 22:48:28 +00:00
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/errqueue.h>
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#include <linux/udp.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/icmp.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include <net/ip.h>
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2022-08-26 14:39:28 +00:00
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#include <net/icmp.h>
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2007-04-26 22:48:28 +00:00
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#include "ar-internal.h"
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2022-08-26 14:39:28 +00:00
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static void rxrpc_adjust_mtu(struct rxrpc_peer *, unsigned int);
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2016-04-04 13:00:34 +00:00
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static void rxrpc_store_error(struct rxrpc_peer *, struct sock_exterr_skb *);
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2018-09-27 14:13:09 +00:00
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static void rxrpc_distribute_error(struct rxrpc_peer *, int,
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enum rxrpc_call_completion);
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2016-04-04 13:00:34 +00:00
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2016-04-04 13:00:32 +00:00
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/*
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2022-08-26 14:39:28 +00:00
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* Find the peer associated with an ICMPv4 packet.
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2016-04-04 13:00:32 +00:00
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*/
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static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local,
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2022-08-26 14:39:28 +00:00
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struct sk_buff *skb,
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unsigned int udp_offset,
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unsigned int *info,
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2018-05-10 22:26:01 +00:00
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struct sockaddr_rxrpc *srx)
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2016-04-04 13:00:32 +00:00
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{
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2022-08-26 14:39:28 +00:00
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struct iphdr *ip, *ip0 = ip_hdr(skb);
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struct icmphdr *icmp = icmp_hdr(skb);
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struct udphdr *udp = (struct udphdr *)(skb->data + udp_offset);
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2016-04-04 13:00:32 +00:00
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2022-08-26 14:39:28 +00:00
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_enter("%u,%u,%u", ip0->protocol, icmp->type, icmp->code);
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switch (icmp->type) {
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case ICMP_DEST_UNREACH:
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*info = ntohs(icmp->un.frag.mtu);
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fallthrough;
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case ICMP_TIME_EXCEEDED:
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case ICMP_PARAMETERPROB:
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ip = (struct iphdr *)((void *)icmp + 8);
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break;
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default:
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return NULL;
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}
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2016-04-04 13:00:32 +00:00
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2018-05-10 22:26:01 +00:00
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memset(srx, 0, sizeof(*srx));
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srx->transport_type = local->srx.transport_type;
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srx->transport_len = local->srx.transport_len;
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srx->transport.family = local->srx.transport.family;
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2016-04-04 13:00:32 +00:00
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/* Can we see an ICMP4 packet on an ICMP6 listening socket? and vice
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* versa?
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*/
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2022-08-26 14:39:28 +00:00
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switch (srx->transport.family) {
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case AF_INET:
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srx->transport_len = sizeof(srx->transport.sin);
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srx->transport.family = AF_INET;
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srx->transport.sin.sin_port = udp->dest;
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memcpy(&srx->transport.sin.sin_addr, &ip->daddr,
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sizeof(struct in_addr));
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break;
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#ifdef CONFIG_AF_RXRPC_IPV6
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case AF_INET6:
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srx->transport_len = sizeof(srx->transport.sin);
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srx->transport.family = AF_INET;
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srx->transport.sin.sin_port = udp->dest;
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memcpy(&srx->transport.sin.sin_addr, &ip->daddr,
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sizeof(struct in_addr));
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break;
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#endif
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default:
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WARN_ON_ONCE(1);
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return NULL;
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}
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_net("ICMP {%pISp}", &srx->transport);
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return rxrpc_lookup_peer_rcu(local, srx);
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}
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#ifdef CONFIG_AF_RXRPC_IPV6
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/*
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* Find the peer associated with an ICMPv6 packet.
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*/
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static struct rxrpc_peer *rxrpc_lookup_peer_icmp6_rcu(struct rxrpc_local *local,
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struct sk_buff *skb,
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unsigned int udp_offset,
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unsigned int *info,
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struct sockaddr_rxrpc *srx)
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{
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struct icmp6hdr *icmp = icmp6_hdr(skb);
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struct ipv6hdr *ip, *ip0 = ipv6_hdr(skb);
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struct udphdr *udp = (struct udphdr *)(skb->data + udp_offset);
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_enter("%u,%u,%u", ip0->nexthdr, icmp->icmp6_type, icmp->icmp6_code);
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switch (icmp->icmp6_type) {
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case ICMPV6_DEST_UNREACH:
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*info = ntohl(icmp->icmp6_mtu);
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fallthrough;
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case ICMPV6_PKT_TOOBIG:
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case ICMPV6_TIME_EXCEED:
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case ICMPV6_PARAMPROB:
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ip = (struct ipv6hdr *)((void *)icmp + 8);
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break;
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default:
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return NULL;
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}
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memset(srx, 0, sizeof(*srx));
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srx->transport_type = local->srx.transport_type;
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srx->transport_len = local->srx.transport_len;
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srx->transport.family = local->srx.transport.family;
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/* Can we see an ICMP4 packet on an ICMP6 listening socket? and vice
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* versa?
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*/
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switch (srx->transport.family) {
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case AF_INET:
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_net("Rx ICMP6 on v4 sock");
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srx->transport_len = sizeof(srx->transport.sin);
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srx->transport.family = AF_INET;
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srx->transport.sin.sin_port = udp->dest;
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memcpy(&srx->transport.sin.sin_addr,
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&ip->daddr.s6_addr32[3], sizeof(struct in_addr));
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break;
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case AF_INET6:
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_net("Rx ICMP6");
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srx->transport.sin.sin_port = udp->dest;
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memcpy(&srx->transport.sin6.sin6_addr, &ip->daddr,
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sizeof(struct in6_addr));
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break;
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default:
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WARN_ON_ONCE(1);
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return NULL;
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}
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_net("ICMP {%pISp}", &srx->transport);
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return rxrpc_lookup_peer_rcu(local, srx);
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}
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#endif /* CONFIG_AF_RXRPC_IPV6 */
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/*
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* Handle an error received on the local endpoint as a tunnel.
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*/
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void rxrpc_encap_err_rcv(struct sock *sk, struct sk_buff *skb,
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unsigned int udp_offset)
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{
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struct sock_extended_err ee;
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struct sockaddr_rxrpc srx;
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struct rxrpc_local *local;
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struct rxrpc_peer *peer;
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unsigned int info = 0;
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int err;
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u8 version = ip_hdr(skb)->version;
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u8 type = icmp_hdr(skb)->type;
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u8 code = icmp_hdr(skb)->code;
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rcu_read_lock();
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local = rcu_dereference_sk_user_data(sk);
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if (unlikely(!local)) {
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rcu_read_unlock();
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return;
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}
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rxrpc_new_skb(skb, rxrpc_skb_received);
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switch (ip_hdr(skb)->version) {
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case IPVERSION:
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peer = rxrpc_lookup_peer_icmp_rcu(local, skb, udp_offset,
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&info, &srx);
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break;
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#ifdef CONFIG_AF_RXRPC_IPV6
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case 6:
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peer = rxrpc_lookup_peer_icmp6_rcu(local, skb, udp_offset,
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&info, &srx);
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break;
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#endif
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default:
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rcu_read_unlock();
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return;
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}
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if (peer && !rxrpc_get_peer_maybe(peer))
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peer = NULL;
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if (!peer) {
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rcu_read_unlock();
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return;
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}
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memset(&ee, 0, sizeof(ee));
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switch (version) {
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case IPVERSION:
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switch (type) {
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case ICMP_DEST_UNREACH:
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switch (code) {
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case ICMP_FRAG_NEEDED:
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rxrpc_adjust_mtu(peer, info);
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rcu_read_unlock();
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rxrpc_put_peer(peer);
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return;
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default:
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break;
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}
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err = EHOSTUNREACH;
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if (code <= NR_ICMP_UNREACH) {
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/* Might want to do something different with
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* non-fatal errors
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*/
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//harderr = icmp_err_convert[code].fatal;
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err = icmp_err_convert[code].errno;
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}
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break;
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case ICMP_TIME_EXCEEDED:
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err = EHOSTUNREACH;
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break;
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default:
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err = EPROTO;
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break;
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}
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ee.ee_origin = SO_EE_ORIGIN_ICMP;
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ee.ee_type = type;
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ee.ee_code = code;
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ee.ee_errno = err;
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break;
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#ifdef CONFIG_AF_RXRPC_IPV6
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case 6:
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switch (type) {
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case ICMPV6_PKT_TOOBIG:
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rxrpc_adjust_mtu(peer, info);
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rcu_read_unlock();
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rxrpc_put_peer(peer);
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return;
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}
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icmpv6_err_convert(type, code, &err);
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if (err == EACCES)
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err = EHOSTUNREACH;
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ee.ee_origin = SO_EE_ORIGIN_ICMP6;
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ee.ee_type = type;
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ee.ee_code = code;
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ee.ee_errno = err;
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break;
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#endif
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}
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trace_rxrpc_rx_icmp(peer, &ee, &srx);
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rxrpc_distribute_error(peer, err, RXRPC_CALL_NETWORK_ERROR);
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rcu_read_unlock();
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rxrpc_put_peer(peer);
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}
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/*
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* Find the peer associated with a local error.
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*/
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static struct rxrpc_peer *rxrpc_lookup_peer_local_rcu(struct rxrpc_local *local,
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const struct sk_buff *skb,
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struct sockaddr_rxrpc *srx)
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{
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struct sock_exterr_skb *serr = SKB_EXT_ERR(skb);
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_enter("");
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memset(srx, 0, sizeof(*srx));
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srx->transport_type = local->srx.transport_type;
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srx->transport_len = local->srx.transport_len;
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srx->transport.family = local->srx.transport.family;
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2018-05-10 22:26:01 +00:00
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switch (srx->transport.family) {
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2016-04-04 13:00:32 +00:00
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case AF_INET:
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2018-10-04 08:32:28 +00:00
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srx->transport_len = sizeof(srx->transport.sin);
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srx->transport.family = AF_INET;
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2018-05-10 22:26:01 +00:00
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srx->transport.sin.sin_port = serr->port;
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2016-04-04 13:00:32 +00:00
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switch (serr->ee.ee_origin) {
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case SO_EE_ORIGIN_ICMP:
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_net("Rx ICMP");
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2018-05-10 22:26:01 +00:00
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memcpy(&srx->transport.sin.sin_addr,
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2016-04-04 13:00:32 +00:00
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skb_network_header(skb) + serr->addr_offset,
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sizeof(struct in_addr));
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break;
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case SO_EE_ORIGIN_ICMP6:
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_net("Rx ICMP6 on v4 sock");
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2018-05-10 22:26:01 +00:00
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memcpy(&srx->transport.sin.sin_addr,
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2016-04-04 13:00:32 +00:00
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skb_network_header(skb) + serr->addr_offset + 12,
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sizeof(struct in_addr));
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break;
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default:
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2018-05-10 22:26:01 +00:00
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memcpy(&srx->transport.sin.sin_addr, &ip_hdr(skb)->saddr,
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2016-04-04 13:00:32 +00:00
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sizeof(struct in_addr));
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break;
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}
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break;
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2016-09-17 06:26:01 +00:00
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#ifdef CONFIG_AF_RXRPC_IPV6
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2016-09-13 07:49:05 +00:00
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case AF_INET6:
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switch (serr->ee.ee_origin) {
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case SO_EE_ORIGIN_ICMP6:
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_net("Rx ICMP6");
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2018-10-04 08:32:28 +00:00
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srx->transport.sin6.sin6_port = serr->port;
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2018-05-10 22:26:01 +00:00
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memcpy(&srx->transport.sin6.sin6_addr,
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2016-09-13 07:49:05 +00:00
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skb_network_header(skb) + serr->addr_offset,
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sizeof(struct in6_addr));
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break;
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case SO_EE_ORIGIN_ICMP:
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_net("Rx ICMP on v6 sock");
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2018-10-04 08:32:28 +00:00
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srx->transport_len = sizeof(srx->transport.sin);
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srx->transport.family = AF_INET;
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srx->transport.sin.sin_port = serr->port;
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memcpy(&srx->transport.sin.sin_addr,
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2016-09-13 07:49:05 +00:00
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skb_network_header(skb) + serr->addr_offset,
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sizeof(struct in_addr));
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break;
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default:
|
2018-05-10 22:26:01 +00:00
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memcpy(&srx->transport.sin6.sin6_addr,
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2016-09-13 07:49:05 +00:00
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&ipv6_hdr(skb)->saddr,
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sizeof(struct in6_addr));
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break;
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}
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break;
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2016-09-17 06:26:01 +00:00
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#endif
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2016-09-13 07:49:05 +00:00
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2016-04-04 13:00:32 +00:00
|
|
|
default:
|
|
|
|
BUG();
|
|
|
|
}
|
|
|
|
|
2018-05-10 22:26:01 +00:00
|
|
|
return rxrpc_lookup_peer_rcu(local, srx);
|
2016-04-04 13:00:32 +00:00
|
|
|
}
|
|
|
|
|
2016-04-04 13:00:33 +00:00
|
|
|
/*
|
|
|
|
* Handle an MTU/fragmentation problem.
|
|
|
|
*/
|
2022-08-26 14:39:28 +00:00
|
|
|
static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, unsigned int mtu)
|
2016-04-04 13:00:33 +00:00
|
|
|
{
|
|
|
|
_net("Rx ICMP Fragmentation Needed (%d)", mtu);
|
|
|
|
|
|
|
|
/* wind down the local interface MTU */
|
|
|
|
if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
|
|
|
|
peer->if_mtu = mtu;
|
|
|
|
_net("I/F MTU %u", mtu);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mtu == 0) {
|
|
|
|
/* they didn't give us a size, estimate one */
|
|
|
|
mtu = peer->if_mtu;
|
|
|
|
if (mtu > 1500) {
|
|
|
|
mtu >>= 1;
|
|
|
|
if (mtu < 1500)
|
|
|
|
mtu = 1500;
|
|
|
|
} else {
|
|
|
|
mtu -= 100;
|
|
|
|
if (mtu < peer->hdrsize)
|
|
|
|
mtu = peer->hdrsize + 4;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mtu < peer->mtu) {
|
|
|
|
spin_lock_bh(&peer->lock);
|
|
|
|
peer->mtu = mtu;
|
|
|
|
peer->maxdata = peer->mtu - peer->hdrsize;
|
|
|
|
spin_unlock_bh(&peer->lock);
|
|
|
|
_net("Net MTU %u (maxdata %u)",
|
|
|
|
peer->mtu, peer->maxdata);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-04-26 22:48:28 +00:00
|
|
|
/*
|
2016-04-04 13:00:34 +00:00
|
|
|
* Handle an error received on the local endpoint.
|
2007-04-26 22:48:28 +00:00
|
|
|
*/
|
2016-04-04 13:00:32 +00:00
|
|
|
void rxrpc_error_report(struct sock *sk)
|
2007-04-26 22:48:28 +00:00
|
|
|
{
|
|
|
|
struct sock_exterr_skb *serr;
|
2018-05-10 22:26:01 +00:00
|
|
|
struct sockaddr_rxrpc srx;
|
2019-10-14 13:04:38 +00:00
|
|
|
struct rxrpc_local *local;
|
2022-08-26 14:39:28 +00:00
|
|
|
struct rxrpc_peer *peer = NULL;
|
2007-04-26 22:48:28 +00:00
|
|
|
struct sk_buff *skb;
|
|
|
|
|
2019-10-14 13:04:38 +00:00
|
|
|
rcu_read_lock();
|
|
|
|
local = rcu_dereference_sk_user_data(sk);
|
|
|
|
if (unlikely(!local)) {
|
|
|
|
rcu_read_unlock();
|
2019-10-10 14:52:34 +00:00
|
|
|
return;
|
2019-10-14 13:04:38 +00:00
|
|
|
}
|
2007-04-26 22:48:28 +00:00
|
|
|
_enter("%p{%d}", sk, local->debug_id);
|
|
|
|
|
2019-04-12 15:33:40 +00:00
|
|
|
/* Clear the outstanding error value on the socket so that it doesn't
|
|
|
|
* cause kernel_sendmsg() to return it later.
|
|
|
|
*/
|
|
|
|
sock_error(sk);
|
|
|
|
|
2014-09-01 01:30:27 +00:00
|
|
|
skb = sock_dequeue_err_skb(sk);
|
2007-04-26 22:48:28 +00:00
|
|
|
if (!skb) {
|
2019-10-14 13:04:38 +00:00
|
|
|
rcu_read_unlock();
|
2007-04-26 22:48:28 +00:00
|
|
|
_leave("UDP socket errqueue empty");
|
|
|
|
return;
|
|
|
|
}
|
2019-08-19 08:25:38 +00:00
|
|
|
rxrpc_new_skb(skb, rxrpc_skb_received);
|
2015-03-08 01:33:22 +00:00
|
|
|
serr = SKB_EXT_ERR(skb);
|
2018-05-10 22:26:01 +00:00
|
|
|
|
2022-08-26 14:39:28 +00:00
|
|
|
if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) {
|
|
|
|
peer = rxrpc_lookup_peer_local_rcu(local, skb, &srx);
|
|
|
|
if (peer && !rxrpc_get_peer_maybe(peer))
|
|
|
|
peer = NULL;
|
|
|
|
if (peer) {
|
|
|
|
trace_rxrpc_rx_icmp(peer, &serr->ee, &srx);
|
|
|
|
rxrpc_store_error(peer, serr);
|
|
|
|
}
|
2007-04-26 22:48:28 +00:00
|
|
|
}
|
|
|
|
|
2016-04-04 13:00:32 +00:00
|
|
|
rcu_read_unlock();
|
2019-08-19 08:25:38 +00:00
|
|
|
rxrpc_free_skb(skb, rxrpc_skb_freed);
|
2018-10-15 21:37:21 +00:00
|
|
|
rxrpc_put_peer(peer);
|
2007-04-26 22:48:28 +00:00
|
|
|
_leave("");
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2016-04-04 13:00:34 +00:00
|
|
|
* Map an error report to error codes on the peer record.
|
2007-04-26 22:48:28 +00:00
|
|
|
*/
|
2016-04-04 13:00:34 +00:00
|
|
|
static void rxrpc_store_error(struct rxrpc_peer *peer,
|
|
|
|
struct sock_exterr_skb *serr)
|
2007-04-26 22:48:28 +00:00
|
|
|
{
|
2018-09-27 14:13:09 +00:00
|
|
|
enum rxrpc_call_completion compl = RXRPC_CALL_NETWORK_ERROR;
|
2007-04-26 22:48:28 +00:00
|
|
|
struct sock_extended_err *ee;
|
2011-05-19 22:37:11 +00:00
|
|
|
int err;
|
2007-04-26 22:48:28 +00:00
|
|
|
|
|
|
|
_enter("");
|
|
|
|
|
|
|
|
ee = &serr->ee;
|
|
|
|
|
|
|
|
err = ee->ee_errno;
|
|
|
|
|
|
|
|
switch (ee->ee_origin) {
|
|
|
|
case SO_EE_ORIGIN_ICMP:
|
|
|
|
switch (ee->ee_type) {
|
|
|
|
case ICMP_DEST_UNREACH:
|
|
|
|
switch (ee->ee_code) {
|
|
|
|
case ICMP_NET_UNREACH:
|
|
|
|
_net("Rx Received ICMP Network Unreachable");
|
|
|
|
break;
|
|
|
|
case ICMP_HOST_UNREACH:
|
|
|
|
_net("Rx Received ICMP Host Unreachable");
|
|
|
|
break;
|
|
|
|
case ICMP_PORT_UNREACH:
|
|
|
|
_net("Rx Received ICMP Port Unreachable");
|
|
|
|
break;
|
|
|
|
case ICMP_NET_UNKNOWN:
|
|
|
|
_net("Rx Received ICMP Unknown Network");
|
|
|
|
break;
|
|
|
|
case ICMP_HOST_UNKNOWN:
|
|
|
|
_net("Rx Received ICMP Unknown Host");
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
_net("Rx Received ICMP DestUnreach code=%u",
|
|
|
|
ee->ee_code);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case ICMP_TIME_EXCEEDED:
|
|
|
|
_net("Rx Received ICMP TTL Exceeded");
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
_proto("Rx Received ICMP error { type=%u code=%u }",
|
|
|
|
ee->ee_type, ee->ee_code);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
2016-04-04 13:00:34 +00:00
|
|
|
case SO_EE_ORIGIN_NONE:
|
2007-04-26 22:48:28 +00:00
|
|
|
case SO_EE_ORIGIN_LOCAL:
|
2016-04-04 13:00:34 +00:00
|
|
|
_proto("Rx Received local error { error=%d }", err);
|
2018-09-27 14:13:09 +00:00
|
|
|
compl = RXRPC_CALL_LOCAL_ERROR;
|
2007-04-26 22:48:28 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case SO_EE_ORIGIN_ICMP6:
|
2020-05-02 12:31:19 +00:00
|
|
|
if (err == EACCES)
|
|
|
|
err = EHOSTUNREACH;
|
2020-08-23 22:36:59 +00:00
|
|
|
fallthrough;
|
2007-04-26 22:48:28 +00:00
|
|
|
default:
|
2016-04-04 13:00:34 +00:00
|
|
|
_proto("Rx Received error report { orig=%u }", ee->ee_origin);
|
2007-04-26 22:48:28 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2018-09-27 14:13:09 +00:00
|
|
|
rxrpc_distribute_error(peer, err, compl);
|
2016-04-04 13:00:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2018-09-27 14:13:09 +00:00
|
|
|
* Distribute an error that occurred on a peer.
|
2016-04-04 13:00:34 +00:00
|
|
|
*/
|
2018-09-27 14:13:09 +00:00
|
|
|
static void rxrpc_distribute_error(struct rxrpc_peer *peer, int error,
|
|
|
|
enum rxrpc_call_completion compl)
|
2016-04-04 13:00:34 +00:00
|
|
|
{
|
|
|
|
struct rxrpc_call *call;
|
2007-04-26 22:48:28 +00:00
|
|
|
|
2018-09-27 14:13:09 +00:00
|
|
|
hlist_for_each_entry_rcu(call, &peer->error_targets, error_link) {
|
2016-08-30 08:49:29 +00:00
|
|
|
rxrpc_see_call(call);
|
2020-06-03 21:21:16 +00:00
|
|
|
rxrpc_set_call_completion(call, compl, 0, -error);
|
2007-04-26 22:48:28 +00:00
|
|
|
}
|
|
|
|
}
|
2016-09-21 23:41:53 +00:00
|
|
|
|
2018-03-30 20:04:43 +00:00
|
|
|
/*
|
2018-08-08 10:30:02 +00:00
|
|
|
* Perform keep-alive pings.
|
2018-03-30 20:04:43 +00:00
|
|
|
*/
|
2018-08-08 10:30:02 +00:00
|
|
|
static void rxrpc_peer_keepalive_dispatch(struct rxrpc_net *rxnet,
|
|
|
|
struct list_head *collector,
|
|
|
|
time64_t base,
|
|
|
|
u8 cursor)
|
2018-03-30 20:04:43 +00:00
|
|
|
{
|
|
|
|
struct rxrpc_peer *peer;
|
2018-08-08 10:30:02 +00:00
|
|
|
const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1;
|
|
|
|
time64_t keepalive_at;
|
|
|
|
int slot;
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2018-08-08 10:30:02 +00:00
|
|
|
spin_lock_bh(&rxnet->peer_hash_lock);
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2018-08-08 10:30:02 +00:00
|
|
|
while (!list_empty(collector)) {
|
|
|
|
peer = list_entry(collector->next,
|
|
|
|
struct rxrpc_peer, keepalive_link);
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2018-08-08 10:30:02 +00:00
|
|
|
list_del_init(&peer->keepalive_link);
|
|
|
|
if (!rxrpc_get_peer_maybe(peer))
|
|
|
|
continue;
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2020-01-30 21:50:36 +00:00
|
|
|
if (__rxrpc_use_local(peer->local)) {
|
|
|
|
spin_unlock_bh(&rxnet->peer_hash_lock);
|
|
|
|
|
|
|
|
keepalive_at = peer->last_tx_at + RXRPC_KEEPALIVE_TIME;
|
|
|
|
slot = keepalive_at - base;
|
|
|
|
_debug("%02x peer %u t=%d {%pISp}",
|
|
|
|
cursor, peer->debug_id, slot, &peer->srx.transport);
|
|
|
|
|
|
|
|
if (keepalive_at <= base ||
|
|
|
|
keepalive_at > base + RXRPC_KEEPALIVE_TIME) {
|
|
|
|
rxrpc_send_keepalive(peer);
|
|
|
|
slot = RXRPC_KEEPALIVE_TIME;
|
|
|
|
}
|
2018-08-08 10:30:02 +00:00
|
|
|
|
2020-01-30 21:50:36 +00:00
|
|
|
/* A transmission to this peer occurred since last we
|
|
|
|
* examined it so put it into the appropriate future
|
|
|
|
* bucket.
|
|
|
|
*/
|
|
|
|
slot += cursor;
|
|
|
|
slot &= mask;
|
|
|
|
spin_lock_bh(&rxnet->peer_hash_lock);
|
|
|
|
list_add_tail(&peer->keepalive_link,
|
|
|
|
&rxnet->peer_keepalive[slot & mask]);
|
|
|
|
rxrpc_unuse_local(peer->local);
|
2018-03-30 20:04:43 +00:00
|
|
|
}
|
2019-07-30 13:42:50 +00:00
|
|
|
rxrpc_put_peer_locked(peer);
|
2018-03-30 20:04:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
spin_unlock_bh(&rxnet->peer_hash_lock);
|
2018-08-08 10:30:02 +00:00
|
|
|
}
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2018-08-08 10:30:02 +00:00
|
|
|
/*
|
|
|
|
* Perform keep-alive pings with VERSION packets to keep any NAT alive.
|
|
|
|
*/
|
|
|
|
void rxrpc_peer_keepalive_worker(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct rxrpc_net *rxnet =
|
|
|
|
container_of(work, struct rxrpc_net, peer_keepalive_work);
|
|
|
|
const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1;
|
|
|
|
time64_t base, now, delay;
|
|
|
|
u8 cursor, stop;
|
|
|
|
LIST_HEAD(collector);
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2018-08-08 10:30:02 +00:00
|
|
|
now = ktime_get_seconds();
|
|
|
|
base = rxnet->peer_keepalive_base;
|
|
|
|
cursor = rxnet->peer_keepalive_cursor;
|
|
|
|
_enter("%lld,%u", base - now, cursor);
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2018-08-08 10:30:02 +00:00
|
|
|
if (!rxnet->live)
|
|
|
|
return;
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2018-08-08 10:30:02 +00:00
|
|
|
/* Remove to a temporary list all the peers that are currently lodged
|
|
|
|
* in expired buckets plus all new peers.
|
|
|
|
*
|
|
|
|
* Everything in the bucket at the cursor is processed this
|
|
|
|
* second; the bucket at cursor + 1 goes at now + 1s and so
|
|
|
|
* on...
|
2018-03-30 20:04:43 +00:00
|
|
|
*/
|
|
|
|
spin_lock_bh(&rxnet->peer_hash_lock);
|
2018-08-08 10:30:02 +00:00
|
|
|
list_splice_init(&rxnet->peer_keepalive_new, &collector);
|
|
|
|
|
|
|
|
stop = cursor + ARRAY_SIZE(rxnet->peer_keepalive);
|
|
|
|
while (base <= now && (s8)(cursor - stop) < 0) {
|
|
|
|
list_splice_tail_init(&rxnet->peer_keepalive[cursor & mask],
|
|
|
|
&collector);
|
|
|
|
base++;
|
|
|
|
cursor++;
|
|
|
|
}
|
2018-03-30 20:04:43 +00:00
|
|
|
|
2018-08-08 10:30:02 +00:00
|
|
|
base = now;
|
|
|
|
spin_unlock_bh(&rxnet->peer_hash_lock);
|
2018-03-30 20:04:43 +00:00
|
|
|
|
|
|
|
rxnet->peer_keepalive_base = base;
|
|
|
|
rxnet->peer_keepalive_cursor = cursor;
|
2018-08-08 10:30:02 +00:00
|
|
|
rxrpc_peer_keepalive_dispatch(rxnet, &collector, base, cursor);
|
|
|
|
ASSERT(list_empty(&collector));
|
|
|
|
|
|
|
|
/* Schedule the timer for the next occupied timeslot. */
|
|
|
|
cursor = rxnet->peer_keepalive_cursor;
|
|
|
|
stop = cursor + RXRPC_KEEPALIVE_TIME - 1;
|
|
|
|
for (; (s8)(cursor - stop) < 0; cursor++) {
|
|
|
|
if (!list_empty(&rxnet->peer_keepalive[cursor & mask]))
|
|
|
|
break;
|
|
|
|
base++;
|
|
|
|
}
|
|
|
|
|
|
|
|
now = ktime_get_seconds();
|
|
|
|
delay = base - now;
|
|
|
|
if (delay < 1)
|
|
|
|
delay = 1;
|
|
|
|
delay *= HZ;
|
|
|
|
if (rxnet->live)
|
|
|
|
timer_reduce(&rxnet->peer_keepalive_timer, jiffies + delay);
|
|
|
|
|
2018-03-30 20:04:43 +00:00
|
|
|
_leave("");
|
|
|
|
}
|