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![David Howells](/assets/img/avatar_default.png)
Fix IPv6 support in AF_RXRPC in the following ways: (1) When extracting the address from a received IPv4 packet, if the local transport socket is open for IPv6 then fill out the sockaddr_rxrpc struct for an IPv4-mapped-to-IPv6 AF_INET6 transport address instead of an AF_INET one. (2) When sending CHALLENGE or RESPONSE packets, the transport length needs to be set from the sockaddr_rxrpc::transport_len field rather than sizeof() on the IPv4 transport address. (3) When processing an IPv4 ICMP packet received by an IPv6 socket, set up the address correctly before searching for the affected peer. Signed-off-by: David Howells <dhowells@redhat.com>
350 lines
8.4 KiB
C
350 lines
8.4 KiB
C
/* Peer event handling, typically ICMP messages.
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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#include "ar-internal.h"
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static void rxrpc_store_error(struct rxrpc_peer *, struct sock_exterr_skb *);
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/*
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* Find the peer associated with an ICMP packet.
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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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const struct sk_buff *skb)
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{
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struct sock_exterr_skb *serr = SKB_EXT_ERR(skb);
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struct sockaddr_rxrpc srx;
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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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/* 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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srx.transport.sin.sin_port = serr->port;
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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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memcpy(&srx.transport.sin.sin_addr,
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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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memcpy(&srx.transport.sin.sin_addr,
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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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memcpy(&srx.transport.sin.sin_addr, &ip_hdr(skb)->saddr,
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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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#ifdef CONFIG_AF_RXRPC_IPV6
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case AF_INET6:
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srx.transport.sin6.sin6_port = serr->port;
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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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memcpy(&srx.transport.sin6.sin6_addr,
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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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srx.transport.sin6.sin6_addr.s6_addr32[0] = 0;
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srx.transport.sin6.sin6_addr.s6_addr32[1] = 0;
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srx.transport.sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
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memcpy(srx.transport.sin6.sin6_addr.s6_addr + 12,
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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:
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memcpy(&srx.transport.sin6.sin6_addr,
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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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#endif
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default:
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BUG();
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}
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return rxrpc_lookup_peer_rcu(local, &srx);
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}
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/*
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* Handle an MTU/fragmentation problem.
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*/
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static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, struct sock_exterr_skb *serr)
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{
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u32 mtu = serr->ee.ee_info;
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_net("Rx ICMP Fragmentation Needed (%d)", mtu);
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/* wind down the local interface MTU */
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if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
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peer->if_mtu = mtu;
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_net("I/F MTU %u", mtu);
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}
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if (mtu == 0) {
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/* they didn't give us a size, estimate one */
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mtu = peer->if_mtu;
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if (mtu > 1500) {
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mtu >>= 1;
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if (mtu < 1500)
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mtu = 1500;
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} else {
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mtu -= 100;
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if (mtu < peer->hdrsize)
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mtu = peer->hdrsize + 4;
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}
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}
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if (mtu < peer->mtu) {
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spin_lock_bh(&peer->lock);
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peer->mtu = mtu;
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peer->maxdata = peer->mtu - peer->hdrsize;
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spin_unlock_bh(&peer->lock);
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_net("Net MTU %u (maxdata %u)",
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peer->mtu, peer->maxdata);
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}
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}
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/*
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* Handle an error received on the local endpoint.
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*/
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void rxrpc_error_report(struct sock *sk)
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{
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struct sock_exterr_skb *serr;
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struct rxrpc_local *local = sk->sk_user_data;
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struct rxrpc_peer *peer;
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struct sk_buff *skb;
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_enter("%p{%d}", sk, local->debug_id);
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skb = sock_dequeue_err_skb(sk);
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if (!skb) {
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_leave("UDP socket errqueue empty");
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return;
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}
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rxrpc_new_skb(skb, rxrpc_skb_rx_received);
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serr = SKB_EXT_ERR(skb);
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if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) {
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_leave("UDP empty message");
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rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
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return;
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}
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rcu_read_lock();
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peer = rxrpc_lookup_peer_icmp_rcu(local, skb);
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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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rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
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_leave(" [no peer]");
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return;
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}
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if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
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serr->ee.ee_type == ICMP_DEST_UNREACH &&
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serr->ee.ee_code == ICMP_FRAG_NEEDED)) {
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rxrpc_adjust_mtu(peer, serr);
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rcu_read_unlock();
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rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
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rxrpc_put_peer(peer);
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_leave(" [MTU update]");
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return;
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}
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rxrpc_store_error(peer, serr);
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rcu_read_unlock();
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rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
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/* The ref we obtained is passed off to the work item */
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rxrpc_queue_work(&peer->error_distributor);
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_leave("");
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}
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/*
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* Map an error report to error codes on the peer record.
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*/
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static void rxrpc_store_error(struct rxrpc_peer *peer,
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struct sock_exterr_skb *serr)
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{
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struct sock_extended_err *ee;
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int err;
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_enter("");
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ee = &serr->ee;
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_net("Rx Error o=%d t=%d c=%d e=%d",
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ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
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err = ee->ee_errno;
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switch (ee->ee_origin) {
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case SO_EE_ORIGIN_ICMP:
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switch (ee->ee_type) {
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case ICMP_DEST_UNREACH:
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switch (ee->ee_code) {
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case ICMP_NET_UNREACH:
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_net("Rx Received ICMP Network Unreachable");
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break;
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case ICMP_HOST_UNREACH:
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_net("Rx Received ICMP Host Unreachable");
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break;
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case ICMP_PORT_UNREACH:
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_net("Rx Received ICMP Port Unreachable");
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break;
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case ICMP_NET_UNKNOWN:
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_net("Rx Received ICMP Unknown Network");
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break;
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case ICMP_HOST_UNKNOWN:
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_net("Rx Received ICMP Unknown Host");
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break;
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default:
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_net("Rx Received ICMP DestUnreach code=%u",
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ee->ee_code);
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break;
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}
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break;
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case ICMP_TIME_EXCEEDED:
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_net("Rx Received ICMP TTL Exceeded");
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break;
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default:
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_proto("Rx Received ICMP error { type=%u code=%u }",
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ee->ee_type, ee->ee_code);
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break;
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}
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break;
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case SO_EE_ORIGIN_NONE:
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case SO_EE_ORIGIN_LOCAL:
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_proto("Rx Received local error { error=%d }", err);
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err += RXRPC_LOCAL_ERROR_OFFSET;
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break;
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case SO_EE_ORIGIN_ICMP6:
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default:
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_proto("Rx Received error report { orig=%u }", ee->ee_origin);
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break;
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}
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peer->error_report = err;
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}
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/*
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* Distribute an error that occurred on a peer
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*/
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void rxrpc_peer_error_distributor(struct work_struct *work)
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{
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struct rxrpc_peer *peer =
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container_of(work, struct rxrpc_peer, error_distributor);
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struct rxrpc_call *call;
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enum rxrpc_call_completion compl;
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int error;
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_enter("");
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error = READ_ONCE(peer->error_report);
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if (error < RXRPC_LOCAL_ERROR_OFFSET) {
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compl = RXRPC_CALL_NETWORK_ERROR;
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} else {
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compl = RXRPC_CALL_LOCAL_ERROR;
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error -= RXRPC_LOCAL_ERROR_OFFSET;
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}
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_debug("ISSUE ERROR %s %d", rxrpc_call_completions[compl], error);
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spin_lock_bh(&peer->lock);
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while (!hlist_empty(&peer->error_targets)) {
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call = hlist_entry(peer->error_targets.first,
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struct rxrpc_call, error_link);
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hlist_del_init(&call->error_link);
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rxrpc_see_call(call);
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if (rxrpc_set_call_completion(call, compl, 0, -error))
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rxrpc_notify_socket(call);
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}
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spin_unlock_bh(&peer->lock);
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rxrpc_put_peer(peer);
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_leave("");
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}
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/*
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* Add RTT information to cache. This is called in softirq mode and has
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* exclusive access to the peer RTT data.
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*/
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void rxrpc_peer_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
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rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial,
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ktime_t send_time, ktime_t resp_time)
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{
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struct rxrpc_peer *peer = call->peer;
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s64 rtt;
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u64 sum = peer->rtt_sum, avg;
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u8 cursor = peer->rtt_cursor, usage = peer->rtt_usage;
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rtt = ktime_to_ns(ktime_sub(resp_time, send_time));
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if (rtt < 0)
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return;
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/* Replace the oldest datum in the RTT buffer */
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sum -= peer->rtt_cache[cursor];
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sum += rtt;
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peer->rtt_cache[cursor] = rtt;
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peer->rtt_cursor = (cursor + 1) & (RXRPC_RTT_CACHE_SIZE - 1);
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peer->rtt_sum = sum;
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if (usage < RXRPC_RTT_CACHE_SIZE) {
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usage++;
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peer->rtt_usage = usage;
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}
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/* Now recalculate the average */
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if (usage == RXRPC_RTT_CACHE_SIZE) {
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avg = sum / RXRPC_RTT_CACHE_SIZE;
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} else {
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avg = sum;
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do_div(avg, usage);
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}
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peer->rtt = avg;
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trace_rxrpc_rtt_rx(call, why, send_serial, resp_serial, rtt,
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usage, avg);
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}
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