12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2f66d7490SDavid Howells /* Peer event handling, typically ICMP messages. 38c3e34a4SDavid Howells * 48c3e34a4SDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 58c3e34a4SDavid Howells * Written by David Howells (dhowells@redhat.com) 68c3e34a4SDavid Howells */ 78c3e34a4SDavid Howells 88c3e34a4SDavid Howells #include <linux/module.h> 98c3e34a4SDavid Howells #include <linux/net.h> 108c3e34a4SDavid Howells #include <linux/skbuff.h> 118c3e34a4SDavid Howells #include <linux/errqueue.h> 128c3e34a4SDavid Howells #include <linux/udp.h> 138c3e34a4SDavid Howells #include <linux/in.h> 148c3e34a4SDavid Howells #include <linux/in6.h> 158c3e34a4SDavid Howells #include <linux/icmp.h> 168c3e34a4SDavid Howells #include <net/sock.h> 178c3e34a4SDavid Howells #include <net/af_rxrpc.h> 188c3e34a4SDavid Howells #include <net/ip.h> 198c3e34a4SDavid Howells #include "ar-internal.h" 208c3e34a4SDavid Howells 21f66d7490SDavid Howells static void rxrpc_store_error(struct rxrpc_peer *, struct sock_exterr_skb *); 22f3344303SDavid Howells static void rxrpc_distribute_error(struct rxrpc_peer *, int, 23f3344303SDavid Howells enum rxrpc_call_completion); 24f66d7490SDavid Howells 258c3e34a4SDavid Howells /* 26ac56a0b4SDavid Howells * Find the peer associated with a local error. 27ac56a0b4SDavid Howells */ 28ac56a0b4SDavid Howells static struct rxrpc_peer *rxrpc_lookup_peer_local_rcu(struct rxrpc_local *local, 29494337c9SDavid Howells const struct sk_buff *skb, 30494337c9SDavid Howells struct sockaddr_rxrpc *srx) 31be6e6707SDavid Howells { 32be6e6707SDavid Howells struct sock_exterr_skb *serr = SKB_EXT_ERR(skb); 33be6e6707SDavid Howells 34be6e6707SDavid Howells _enter(""); 35be6e6707SDavid Howells 36494337c9SDavid Howells memset(srx, 0, sizeof(*srx)); 37494337c9SDavid Howells srx->transport_type = local->srx.transport_type; 38494337c9SDavid Howells srx->transport_len = local->srx.transport_len; 39494337c9SDavid Howells srx->transport.family = local->srx.transport.family; 40be6e6707SDavid Howells 41*b6c66c43SDavid Howells /* Can we see an ICMP4 packet on an ICMP6 listening socket? and vice 42*b6c66c43SDavid Howells * versa? 43*b6c66c43SDavid Howells */ 44494337c9SDavid Howells switch (srx->transport.family) { 45be6e6707SDavid Howells case AF_INET: 4646894a13SDavid Howells srx->transport_len = sizeof(srx->transport.sin); 4746894a13SDavid Howells srx->transport.family = AF_INET; 48494337c9SDavid Howells srx->transport.sin.sin_port = serr->port; 49be6e6707SDavid Howells switch (serr->ee.ee_origin) { 50be6e6707SDavid Howells case SO_EE_ORIGIN_ICMP: 51be6e6707SDavid Howells _net("Rx ICMP"); 52494337c9SDavid Howells memcpy(&srx->transport.sin.sin_addr, 53be6e6707SDavid Howells skb_network_header(skb) + serr->addr_offset, 54be6e6707SDavid Howells sizeof(struct in_addr)); 55be6e6707SDavid Howells break; 56be6e6707SDavid Howells case SO_EE_ORIGIN_ICMP6: 57be6e6707SDavid Howells _net("Rx ICMP6 on v4 sock"); 58494337c9SDavid Howells memcpy(&srx->transport.sin.sin_addr, 59be6e6707SDavid Howells skb_network_header(skb) + serr->addr_offset + 12, 60be6e6707SDavid Howells sizeof(struct in_addr)); 61be6e6707SDavid Howells break; 62be6e6707SDavid Howells default: 63494337c9SDavid Howells memcpy(&srx->transport.sin.sin_addr, &ip_hdr(skb)->saddr, 64be6e6707SDavid Howells sizeof(struct in_addr)); 65be6e6707SDavid Howells break; 66be6e6707SDavid Howells } 67be6e6707SDavid Howells break; 68be6e6707SDavid Howells 69d1912747SDavid Howells #ifdef CONFIG_AF_RXRPC_IPV6 7075b54cb5SDavid Howells case AF_INET6: 7175b54cb5SDavid Howells switch (serr->ee.ee_origin) { 7275b54cb5SDavid Howells case SO_EE_ORIGIN_ICMP6: 7375b54cb5SDavid Howells _net("Rx ICMP6"); 7446894a13SDavid Howells srx->transport.sin6.sin6_port = serr->port; 75494337c9SDavid Howells memcpy(&srx->transport.sin6.sin6_addr, 7675b54cb5SDavid Howells skb_network_header(skb) + serr->addr_offset, 7775b54cb5SDavid Howells sizeof(struct in6_addr)); 7875b54cb5SDavid Howells break; 7975b54cb5SDavid Howells case SO_EE_ORIGIN_ICMP: 8075b54cb5SDavid Howells _net("Rx ICMP on v6 sock"); 8146894a13SDavid Howells srx->transport_len = sizeof(srx->transport.sin); 8246894a13SDavid Howells srx->transport.family = AF_INET; 8346894a13SDavid Howells srx->transport.sin.sin_port = serr->port; 8446894a13SDavid Howells memcpy(&srx->transport.sin.sin_addr, 8575b54cb5SDavid Howells skb_network_header(skb) + serr->addr_offset, 8675b54cb5SDavid Howells sizeof(struct in_addr)); 8775b54cb5SDavid Howells break; 8875b54cb5SDavid Howells default: 89494337c9SDavid Howells memcpy(&srx->transport.sin6.sin6_addr, 9075b54cb5SDavid Howells &ipv6_hdr(skb)->saddr, 9175b54cb5SDavid Howells sizeof(struct in6_addr)); 9275b54cb5SDavid Howells break; 9375b54cb5SDavid Howells } 9475b54cb5SDavid Howells break; 95d1912747SDavid Howells #endif 9675b54cb5SDavid Howells 97be6e6707SDavid Howells default: 98be6e6707SDavid Howells BUG(); 99be6e6707SDavid Howells } 100be6e6707SDavid Howells 101494337c9SDavid Howells return rxrpc_lookup_peer_rcu(local, srx); 102be6e6707SDavid Howells } 103be6e6707SDavid Howells 104be6e6707SDavid Howells /* 1051a70c05bSDavid Howells * Handle an MTU/fragmentation problem. 1061a70c05bSDavid Howells */ 107ac56a0b4SDavid Howells static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, unsigned int mtu) 1081a70c05bSDavid Howells { 1091a70c05bSDavid Howells _net("Rx ICMP Fragmentation Needed (%d)", mtu); 1101a70c05bSDavid Howells 1111a70c05bSDavid Howells /* wind down the local interface MTU */ 1121a70c05bSDavid Howells if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) { 1131a70c05bSDavid Howells peer->if_mtu = mtu; 1141a70c05bSDavid Howells _net("I/F MTU %u", mtu); 1151a70c05bSDavid Howells } 1161a70c05bSDavid Howells 1171a70c05bSDavid Howells if (mtu == 0) { 1181a70c05bSDavid Howells /* they didn't give us a size, estimate one */ 1191a70c05bSDavid Howells mtu = peer->if_mtu; 1201a70c05bSDavid Howells if (mtu > 1500) { 1211a70c05bSDavid Howells mtu >>= 1; 1221a70c05bSDavid Howells if (mtu < 1500) 1231a70c05bSDavid Howells mtu = 1500; 1241a70c05bSDavid Howells } else { 1251a70c05bSDavid Howells mtu -= 100; 1261a70c05bSDavid Howells if (mtu < peer->hdrsize) 1271a70c05bSDavid Howells mtu = peer->hdrsize + 4; 1281a70c05bSDavid Howells } 1291a70c05bSDavid Howells } 1301a70c05bSDavid Howells 1311a70c05bSDavid Howells if (mtu < peer->mtu) { 1321a70c05bSDavid Howells spin_lock_bh(&peer->lock); 1331a70c05bSDavid Howells peer->mtu = mtu; 1341a70c05bSDavid Howells peer->maxdata = peer->mtu - peer->hdrsize; 1351a70c05bSDavid Howells spin_unlock_bh(&peer->lock); 1361a70c05bSDavid Howells _net("Net MTU %u (maxdata %u)", 1371a70c05bSDavid Howells peer->mtu, peer->maxdata); 1381a70c05bSDavid Howells } 1391a70c05bSDavid Howells } 1401a70c05bSDavid Howells 1411a70c05bSDavid Howells /* 142f66d7490SDavid Howells * Handle an error received on the local endpoint. 1438c3e34a4SDavid Howells */ 144abe89ef0SDavid Howells void rxrpc_error_report(struct sock *sk) 1458c3e34a4SDavid Howells { 1468c3e34a4SDavid Howells struct sock_exterr_skb *serr; 147494337c9SDavid Howells struct sockaddr_rxrpc srx; 1482ca4f6caSEric Dumazet struct rxrpc_local *local; 149ac56a0b4SDavid Howells struct rxrpc_peer *peer = NULL; 1508c3e34a4SDavid Howells struct sk_buff *skb; 1518c3e34a4SDavid Howells 1522ca4f6caSEric Dumazet rcu_read_lock(); 1532ca4f6caSEric Dumazet local = rcu_dereference_sk_user_data(sk); 1542ca4f6caSEric Dumazet if (unlikely(!local)) { 1552ca4f6caSEric Dumazet rcu_read_unlock(); 156f0308fb0SDavid Howells return; 1572ca4f6caSEric Dumazet } 1588c3e34a4SDavid Howells _enter("%p{%d}", sk, local->debug_id); 1598c3e34a4SDavid Howells 16056d282d9SMarc Dionne /* Clear the outstanding error value on the socket so that it doesn't 16156d282d9SMarc Dionne * cause kernel_sendmsg() to return it later. 16256d282d9SMarc Dionne */ 16356d282d9SMarc Dionne sock_error(sk); 16456d282d9SMarc Dionne 1658c3e34a4SDavid Howells skb = sock_dequeue_err_skb(sk); 1668c3e34a4SDavid Howells if (!skb) { 1672ca4f6caSEric Dumazet rcu_read_unlock(); 1688c3e34a4SDavid Howells _leave("UDP socket errqueue empty"); 1698c3e34a4SDavid Howells return; 1708c3e34a4SDavid Howells } 171987db9f7SDavid Howells rxrpc_new_skb(skb, rxrpc_skb_received); 1728c3e34a4SDavid Howells serr = SKB_EXT_ERR(skb); 173*b6c66c43SDavid Howells if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) { 174*b6c66c43SDavid Howells _leave("UDP empty message"); 175*b6c66c43SDavid Howells rcu_read_unlock(); 176*b6c66c43SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_freed); 177*b6c66c43SDavid Howells return; 178*b6c66c43SDavid Howells } 1798c3e34a4SDavid Howells 180ac56a0b4SDavid Howells peer = rxrpc_lookup_peer_local_rcu(local, skb, &srx); 181be6e6707SDavid Howells if (peer && !rxrpc_get_peer_maybe(peer)) 182be6e6707SDavid Howells peer = NULL; 183*b6c66c43SDavid Howells if (!peer) { 184*b6c66c43SDavid Howells rcu_read_unlock(); 185*b6c66c43SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_freed); 186*b6c66c43SDavid Howells _leave(" [no peer]"); 187*b6c66c43SDavid Howells return; 1881a70c05bSDavid Howells } 189f66d7490SDavid Howells 190*b6c66c43SDavid Howells trace_rxrpc_rx_icmp(peer, &serr->ee, &srx); 191*b6c66c43SDavid Howells 192*b6c66c43SDavid Howells if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP && 193*b6c66c43SDavid Howells serr->ee.ee_type == ICMP_DEST_UNREACH && 194*b6c66c43SDavid Howells serr->ee.ee_code == ICMP_FRAG_NEEDED)) { 195*b6c66c43SDavid Howells rxrpc_adjust_mtu(peer, serr->ee.ee_info); 196*b6c66c43SDavid Howells goto out; 197*b6c66c43SDavid Howells } 198*b6c66c43SDavid Howells 199*b6c66c43SDavid Howells rxrpc_store_error(peer, serr); 200*b6c66c43SDavid Howells out: 201f66d7490SDavid Howells rcu_read_unlock(); 202987db9f7SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_freed); 2031890fea7SDavid Howells rxrpc_put_peer(peer); 204*b6c66c43SDavid Howells 2058c3e34a4SDavid Howells _leave(""); 2068c3e34a4SDavid Howells } 2078c3e34a4SDavid Howells 2088c3e34a4SDavid Howells /* 209f66d7490SDavid Howells * Map an error report to error codes on the peer record. 2108c3e34a4SDavid Howells */ 211f66d7490SDavid Howells static void rxrpc_store_error(struct rxrpc_peer *peer, 212f66d7490SDavid Howells struct sock_exterr_skb *serr) 2138c3e34a4SDavid Howells { 214f3344303SDavid Howells enum rxrpc_call_completion compl = RXRPC_CALL_NETWORK_ERROR; 2158c3e34a4SDavid Howells struct sock_extended_err *ee; 2168c3e34a4SDavid Howells int err; 2178c3e34a4SDavid Howells 2188c3e34a4SDavid Howells _enter(""); 2198c3e34a4SDavid Howells 2208c3e34a4SDavid Howells ee = &serr->ee; 2218c3e34a4SDavid Howells 2228c3e34a4SDavid Howells err = ee->ee_errno; 2238c3e34a4SDavid Howells 2248c3e34a4SDavid Howells switch (ee->ee_origin) { 2258c3e34a4SDavid Howells case SO_EE_ORIGIN_ICMP: 2268c3e34a4SDavid Howells switch (ee->ee_type) { 2278c3e34a4SDavid Howells case ICMP_DEST_UNREACH: 2288c3e34a4SDavid Howells switch (ee->ee_code) { 2298c3e34a4SDavid Howells case ICMP_NET_UNREACH: 2308c3e34a4SDavid Howells _net("Rx Received ICMP Network Unreachable"); 2318c3e34a4SDavid Howells break; 2328c3e34a4SDavid Howells case ICMP_HOST_UNREACH: 2338c3e34a4SDavid Howells _net("Rx Received ICMP Host Unreachable"); 2348c3e34a4SDavid Howells break; 2358c3e34a4SDavid Howells case ICMP_PORT_UNREACH: 2368c3e34a4SDavid Howells _net("Rx Received ICMP Port Unreachable"); 2378c3e34a4SDavid Howells break; 2388c3e34a4SDavid Howells case ICMP_NET_UNKNOWN: 2398c3e34a4SDavid Howells _net("Rx Received ICMP Unknown Network"); 2408c3e34a4SDavid Howells break; 2418c3e34a4SDavid Howells case ICMP_HOST_UNKNOWN: 2428c3e34a4SDavid Howells _net("Rx Received ICMP Unknown Host"); 2438c3e34a4SDavid Howells break; 2448c3e34a4SDavid Howells default: 2458c3e34a4SDavid Howells _net("Rx Received ICMP DestUnreach code=%u", 2468c3e34a4SDavid Howells ee->ee_code); 2478c3e34a4SDavid Howells break; 2488c3e34a4SDavid Howells } 2498c3e34a4SDavid Howells break; 2508c3e34a4SDavid Howells 2518c3e34a4SDavid Howells case ICMP_TIME_EXCEEDED: 2528c3e34a4SDavid Howells _net("Rx Received ICMP TTL Exceeded"); 2538c3e34a4SDavid Howells break; 2548c3e34a4SDavid Howells 2558c3e34a4SDavid Howells default: 2568c3e34a4SDavid Howells _proto("Rx Received ICMP error { type=%u code=%u }", 2578c3e34a4SDavid Howells ee->ee_type, ee->ee_code); 2588c3e34a4SDavid Howells break; 2598c3e34a4SDavid Howells } 2608c3e34a4SDavid Howells break; 2618c3e34a4SDavid Howells 262f66d7490SDavid Howells case SO_EE_ORIGIN_NONE: 2638c3e34a4SDavid Howells case SO_EE_ORIGIN_LOCAL: 264fe77d5fcSDavid Howells _proto("Rx Received local error { error=%d }", err); 265f3344303SDavid Howells compl = RXRPC_CALL_LOCAL_ERROR; 2668c3e34a4SDavid Howells break; 2678c3e34a4SDavid Howells 2688c3e34a4SDavid Howells case SO_EE_ORIGIN_ICMP6: 26923e2db31SDavid Howells if (err == EACCES) 27023e2db31SDavid Howells err = EHOSTUNREACH; 271df561f66SGustavo A. R. Silva fallthrough; 2728c3e34a4SDavid Howells default: 273fe77d5fcSDavid Howells _proto("Rx Received error report { orig=%u }", ee->ee_origin); 2748c3e34a4SDavid Howells break; 2758c3e34a4SDavid Howells } 2768c3e34a4SDavid Howells 277f3344303SDavid Howells rxrpc_distribute_error(peer, err, compl); 278f66d7490SDavid Howells } 2798c3e34a4SDavid Howells 280f66d7490SDavid Howells /* 281f3344303SDavid Howells * Distribute an error that occurred on a peer. 282f66d7490SDavid Howells */ 283f3344303SDavid Howells static void rxrpc_distribute_error(struct rxrpc_peer *peer, int error, 284f3344303SDavid Howells enum rxrpc_call_completion compl) 285f66d7490SDavid Howells { 286f66d7490SDavid Howells struct rxrpc_call *call; 2878c3e34a4SDavid Howells 288f3344303SDavid Howells hlist_for_each_entry_rcu(call, &peer->error_targets, error_link) { 289e34d4234SDavid Howells rxrpc_see_call(call); 2905ac0d622SDavid Howells rxrpc_set_call_completion(call, compl, 0, -error); 2918c3e34a4SDavid Howells } 2928c3e34a4SDavid Howells } 293cf1a6474SDavid Howells 294cf1a6474SDavid Howells /* 295330bdcfaSDavid Howells * Perform keep-alive pings. 296330bdcfaSDavid Howells */ 297330bdcfaSDavid Howells static void rxrpc_peer_keepalive_dispatch(struct rxrpc_net *rxnet, 298330bdcfaSDavid Howells struct list_head *collector, 299330bdcfaSDavid Howells time64_t base, 300330bdcfaSDavid Howells u8 cursor) 301330bdcfaSDavid Howells { 302330bdcfaSDavid Howells struct rxrpc_peer *peer; 303330bdcfaSDavid Howells const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1; 304330bdcfaSDavid Howells time64_t keepalive_at; 305330bdcfaSDavid Howells int slot; 306330bdcfaSDavid Howells 307330bdcfaSDavid Howells spin_lock_bh(&rxnet->peer_hash_lock); 308330bdcfaSDavid Howells 309330bdcfaSDavid Howells while (!list_empty(collector)) { 310330bdcfaSDavid Howells peer = list_entry(collector->next, 311330bdcfaSDavid Howells struct rxrpc_peer, keepalive_link); 312330bdcfaSDavid Howells 313330bdcfaSDavid Howells list_del_init(&peer->keepalive_link); 314330bdcfaSDavid Howells if (!rxrpc_get_peer_maybe(peer)) 315330bdcfaSDavid Howells continue; 316330bdcfaSDavid Howells 31704d36d74SDavid Howells if (__rxrpc_use_local(peer->local)) { 318330bdcfaSDavid Howells spin_unlock_bh(&rxnet->peer_hash_lock); 319330bdcfaSDavid Howells 320330bdcfaSDavid Howells keepalive_at = peer->last_tx_at + RXRPC_KEEPALIVE_TIME; 321330bdcfaSDavid Howells slot = keepalive_at - base; 322330bdcfaSDavid Howells _debug("%02x peer %u t=%d {%pISp}", 323330bdcfaSDavid Howells cursor, peer->debug_id, slot, &peer->srx.transport); 324330bdcfaSDavid Howells 325330bdcfaSDavid Howells if (keepalive_at <= base || 326330bdcfaSDavid Howells keepalive_at > base + RXRPC_KEEPALIVE_TIME) { 327330bdcfaSDavid Howells rxrpc_send_keepalive(peer); 328330bdcfaSDavid Howells slot = RXRPC_KEEPALIVE_TIME; 329330bdcfaSDavid Howells } 330330bdcfaSDavid Howells 33104d36d74SDavid Howells /* A transmission to this peer occurred since last we 33204d36d74SDavid Howells * examined it so put it into the appropriate future 33304d36d74SDavid Howells * bucket. 334330bdcfaSDavid Howells */ 335330bdcfaSDavid Howells slot += cursor; 336330bdcfaSDavid Howells slot &= mask; 337330bdcfaSDavid Howells spin_lock_bh(&rxnet->peer_hash_lock); 338330bdcfaSDavid Howells list_add_tail(&peer->keepalive_link, 339330bdcfaSDavid Howells &rxnet->peer_keepalive[slot & mask]); 34004d36d74SDavid Howells rxrpc_unuse_local(peer->local); 34104d36d74SDavid Howells } 34260034d3dSDavid Howells rxrpc_put_peer_locked(peer); 343330bdcfaSDavid Howells } 344330bdcfaSDavid Howells 345330bdcfaSDavid Howells spin_unlock_bh(&rxnet->peer_hash_lock); 346330bdcfaSDavid Howells } 347330bdcfaSDavid Howells 348330bdcfaSDavid Howells /* 349ace45becSDavid Howells * Perform keep-alive pings with VERSION packets to keep any NAT alive. 350ace45becSDavid Howells */ 351ace45becSDavid Howells void rxrpc_peer_keepalive_worker(struct work_struct *work) 352ace45becSDavid Howells { 353ace45becSDavid Howells struct rxrpc_net *rxnet = 354ace45becSDavid Howells container_of(work, struct rxrpc_net, peer_keepalive_work); 355330bdcfaSDavid Howells const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1; 356330bdcfaSDavid Howells time64_t base, now, delay; 357330bdcfaSDavid Howells u8 cursor, stop; 358330bdcfaSDavid Howells LIST_HEAD(collector); 359ace45becSDavid Howells 360330bdcfaSDavid Howells now = ktime_get_seconds(); 361ace45becSDavid Howells base = rxnet->peer_keepalive_base; 362ace45becSDavid Howells cursor = rxnet->peer_keepalive_cursor; 363330bdcfaSDavid Howells _enter("%lld,%u", base - now, cursor); 364ace45becSDavid Howells 365330bdcfaSDavid Howells if (!rxnet->live) 366330bdcfaSDavid Howells return; 367ace45becSDavid Howells 368330bdcfaSDavid Howells /* Remove to a temporary list all the peers that are currently lodged 369330bdcfaSDavid Howells * in expired buckets plus all new peers. 370330bdcfaSDavid Howells * 371330bdcfaSDavid Howells * Everything in the bucket at the cursor is processed this 372330bdcfaSDavid Howells * second; the bucket at cursor + 1 goes at now + 1s and so 373330bdcfaSDavid Howells * on... 374ace45becSDavid Howells */ 375ace45becSDavid Howells spin_lock_bh(&rxnet->peer_hash_lock); 376330bdcfaSDavid Howells list_splice_init(&rxnet->peer_keepalive_new, &collector); 377ace45becSDavid Howells 378330bdcfaSDavid Howells stop = cursor + ARRAY_SIZE(rxnet->peer_keepalive); 379330bdcfaSDavid Howells while (base <= now && (s8)(cursor - stop) < 0) { 380330bdcfaSDavid Howells list_splice_tail_init(&rxnet->peer_keepalive[cursor & mask], 381330bdcfaSDavid Howells &collector); 382330bdcfaSDavid Howells base++; 383ace45becSDavid Howells cursor++; 384330bdcfaSDavid Howells } 385ace45becSDavid Howells 386330bdcfaSDavid Howells base = now; 387330bdcfaSDavid Howells spin_unlock_bh(&rxnet->peer_hash_lock); 388330bdcfaSDavid Howells 389ace45becSDavid Howells rxnet->peer_keepalive_base = base; 390ace45becSDavid Howells rxnet->peer_keepalive_cursor = cursor; 391330bdcfaSDavid Howells rxrpc_peer_keepalive_dispatch(rxnet, &collector, base, cursor); 392330bdcfaSDavid Howells ASSERT(list_empty(&collector)); 393330bdcfaSDavid Howells 394330bdcfaSDavid Howells /* Schedule the timer for the next occupied timeslot. */ 395330bdcfaSDavid Howells cursor = rxnet->peer_keepalive_cursor; 396330bdcfaSDavid Howells stop = cursor + RXRPC_KEEPALIVE_TIME - 1; 397330bdcfaSDavid Howells for (; (s8)(cursor - stop) < 0; cursor++) { 398330bdcfaSDavid Howells if (!list_empty(&rxnet->peer_keepalive[cursor & mask])) 399330bdcfaSDavid Howells break; 400330bdcfaSDavid Howells base++; 401330bdcfaSDavid Howells } 402330bdcfaSDavid Howells 403330bdcfaSDavid Howells now = ktime_get_seconds(); 404330bdcfaSDavid Howells delay = base - now; 405330bdcfaSDavid Howells if (delay < 1) 406330bdcfaSDavid Howells delay = 1; 407330bdcfaSDavid Howells delay *= HZ; 408330bdcfaSDavid Howells if (rxnet->live) 409ace45becSDavid Howells timer_reduce(&rxnet->peer_keepalive_timer, jiffies + delay); 410330bdcfaSDavid Howells 411ace45becSDavid Howells _leave(""); 412ace45becSDavid Howells } 413