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Release 4.8 net/rxrpc/peer_event.c

Directory: net/rxrpc
/* Peer event handling, typically ICMP messages.
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.

#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/errqueue.h>
#include <linux/udp.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/icmp.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include <net/ip.h>
#include "ar-internal.h"

static void rxrpc_store_error(struct rxrpc_peer *, struct sock_exterr_skb *);

 * Find the peer associated with an ICMP packet.

static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local, const struct sk_buff *skb) { struct sock_exterr_skb *serr = SKB_EXT_ERR(skb); struct sockaddr_rxrpc srx; _enter(""); memset(&srx, 0, sizeof(srx)); srx.transport_type = local->srx.transport_type; = local->; /* Can we see an ICMP4 packet on an ICMP6 listening socket? and vice * versa? */ switch ( { case AF_INET: srx.transport.sin.sin_port = serr->port; srx.transport_len = sizeof(struct sockaddr_in); switch (serr->ee.ee_origin) { case SO_EE_ORIGIN_ICMP: _net("Rx ICMP"); memcpy(&srx.transport.sin.sin_addr, skb_network_header(skb) + serr->addr_offset, sizeof(struct in_addr)); break; case SO_EE_ORIGIN_ICMP6: _net("Rx ICMP6 on v4 sock"); memcpy(&srx.transport.sin.sin_addr, skb_network_header(skb) + serr->addr_offset + 12, sizeof(struct in_addr)); break; default: memcpy(&srx.transport.sin.sin_addr, &ip_hdr(skb)->saddr, sizeof(struct in_addr)); break; } break; default: BUG(); } return rxrpc_lookup_peer_rcu(local, &srx); }


david howellsdavid howells237100.00%1100.00%

/* * Handle an MTU/fragmentation problem. */
static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, struct sock_exterr_skb *serr) { u32 mtu = serr->ee.ee_info; _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); } }


david howellsdavid howells183100.00%1100.00%

/* * Handle an error received on the local endpoint. */
void rxrpc_error_report(struct sock *sk) { struct sock_exterr_skb *serr; struct rxrpc_local *local = sk->sk_user_data; struct rxrpc_peer *peer; struct sk_buff *skb; _enter("%p{%d}", sk, local->debug_id); skb = sock_dequeue_err_skb(sk); if (!skb) { _leave("UDP socket errqueue empty"); return; } serr = SKB_EXT_ERR(skb); if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) { _leave("UDP empty message"); kfree_skb(skb); return; } rxrpc_new_skb(skb); rcu_read_lock(); peer = rxrpc_lookup_peer_icmp_rcu(local, skb); if (peer && !rxrpc_get_peer_maybe(peer)) peer = NULL; if (!peer) { rcu_read_unlock(); rxrpc_free_skb(skb); _leave(" [no peer]"); return; } if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP && serr->ee.ee_type == ICMP_DEST_UNREACH && serr->ee.ee_code == ICMP_FRAG_NEEDED)) { rxrpc_adjust_mtu(peer, serr); rcu_read_unlock(); rxrpc_free_skb(skb); rxrpc_put_peer(peer); _leave(" [MTU update]"); return; } rxrpc_store_error(peer, serr); rcu_read_unlock(); rxrpc_free_skb(skb); /* The ref we obtained is passed off to the work item */ rxrpc_queue_work(&peer->error_distributor); _leave(""); }


david howellsdavid howells20184.81%770.00%
willem de bruijnwillem de bruijn3615.19%330.00%

/* * Map an error report to error codes on the peer record. */
static void rxrpc_store_error(struct rxrpc_peer *peer, struct sock_exterr_skb *serr) { struct sock_extended_err *ee; int err; _enter(""); ee = &serr->ee; _net("Rx Error o=%d t=%d c=%d e=%d", ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno); 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; case SO_EE_ORIGIN_NONE: case SO_EE_ORIGIN_LOCAL: _proto("Rx Received local error { error=%d }", err); err += RXRPC_LOCAL_ERROR_OFFSET; break; case SO_EE_ORIGIN_ICMP6: default: _proto("Rx Received error report { orig=%u }", ee->ee_origin); break; } peer->error_report = err; }


david howellsdavid howells213100.00%3100.00%

/* * Distribute an error that occurred on a peer */
void rxrpc_peer_error_distributor(struct work_struct *work) { struct rxrpc_peer *peer = container_of(work, struct rxrpc_peer, error_distributor); struct rxrpc_call *call; int error_report; _enter(""); error_report = READ_ONCE(peer->error_report); _debug("ISSUE ERROR %d", error_report); spin_lock_bh(&peer->lock); while (!hlist_empty(&peer->error_targets)) { call = hlist_entry(peer->error_targets.first, struct rxrpc_call, error_link); hlist_del_init(&call->error_link); write_lock(&call->state_lock); if (call->state != RXRPC_CALL_COMPLETE && call->state < RXRPC_CALL_NETWORK_ERROR) { call->error_report = error_report; call->state = RXRPC_CALL_NETWORK_ERROR; set_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events); rxrpc_queue_call(call); } write_unlock(&call->state_lock); } spin_unlock_bh(&peer->lock); rxrpc_put_peer(peer); _leave(""); }


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Directory: net/rxrpc
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