1f66d7490SDavid Howells /* Peer event handling, typically ICMP messages. 28c3e34a4SDavid Howells * 38c3e34a4SDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 48c3e34a4SDavid Howells * Written by David Howells (dhowells@redhat.com) 58c3e34a4SDavid Howells * 68c3e34a4SDavid Howells * This program is free software; you can redistribute it and/or 78c3e34a4SDavid Howells * modify it under the terms of the GNU General Public License 88c3e34a4SDavid Howells * as published by the Free Software Foundation; either version 98c3e34a4SDavid Howells * 2 of the License, or (at your option) any later version. 108c3e34a4SDavid Howells */ 118c3e34a4SDavid Howells 128c3e34a4SDavid Howells #include <linux/module.h> 138c3e34a4SDavid Howells #include <linux/net.h> 148c3e34a4SDavid Howells #include <linux/skbuff.h> 158c3e34a4SDavid Howells #include <linux/errqueue.h> 168c3e34a4SDavid Howells #include <linux/udp.h> 178c3e34a4SDavid Howells #include <linux/in.h> 188c3e34a4SDavid Howells #include <linux/in6.h> 198c3e34a4SDavid Howells #include <linux/icmp.h> 208c3e34a4SDavid Howells #include <net/sock.h> 218c3e34a4SDavid Howells #include <net/af_rxrpc.h> 228c3e34a4SDavid Howells #include <net/ip.h> 238c3e34a4SDavid Howells #include "ar-internal.h" 248c3e34a4SDavid Howells 25f66d7490SDavid Howells static void rxrpc_store_error(struct rxrpc_peer *, struct sock_exterr_skb *); 26f3344303SDavid Howells static void rxrpc_distribute_error(struct rxrpc_peer *, int, 27f3344303SDavid Howells enum rxrpc_call_completion); 28f66d7490SDavid Howells 298c3e34a4SDavid Howells /* 30be6e6707SDavid Howells * Find the peer associated with an ICMP packet. 31be6e6707SDavid Howells */ 32be6e6707SDavid Howells static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local, 33494337c9SDavid Howells const struct sk_buff *skb, 34494337c9SDavid Howells struct sockaddr_rxrpc *srx) 35be6e6707SDavid Howells { 36be6e6707SDavid Howells struct sock_exterr_skb *serr = SKB_EXT_ERR(skb); 37be6e6707SDavid Howells 38be6e6707SDavid Howells _enter(""); 39be6e6707SDavid Howells 40494337c9SDavid Howells memset(srx, 0, sizeof(*srx)); 41494337c9SDavid Howells srx->transport_type = local->srx.transport_type; 42494337c9SDavid Howells srx->transport_len = local->srx.transport_len; 43494337c9SDavid Howells srx->transport.family = local->srx.transport.family; 44be6e6707SDavid Howells 45be6e6707SDavid Howells /* Can we see an ICMP4 packet on an ICMP6 listening socket? and vice 46be6e6707SDavid Howells * versa? 47be6e6707SDavid Howells */ 48494337c9SDavid Howells switch (srx->transport.family) { 49be6e6707SDavid Howells case AF_INET: 5046894a13SDavid Howells srx->transport_len = sizeof(srx->transport.sin); 5146894a13SDavid Howells srx->transport.family = AF_INET; 52494337c9SDavid Howells srx->transport.sin.sin_port = serr->port; 53be6e6707SDavid Howells switch (serr->ee.ee_origin) { 54be6e6707SDavid Howells case SO_EE_ORIGIN_ICMP: 55be6e6707SDavid Howells _net("Rx ICMP"); 56494337c9SDavid Howells memcpy(&srx->transport.sin.sin_addr, 57be6e6707SDavid Howells skb_network_header(skb) + serr->addr_offset, 58be6e6707SDavid Howells sizeof(struct in_addr)); 59be6e6707SDavid Howells break; 60be6e6707SDavid Howells case SO_EE_ORIGIN_ICMP6: 61be6e6707SDavid Howells _net("Rx ICMP6 on v4 sock"); 62494337c9SDavid Howells memcpy(&srx->transport.sin.sin_addr, 63be6e6707SDavid Howells skb_network_header(skb) + serr->addr_offset + 12, 64be6e6707SDavid Howells sizeof(struct in_addr)); 65be6e6707SDavid Howells break; 66be6e6707SDavid Howells default: 67494337c9SDavid Howells memcpy(&srx->transport.sin.sin_addr, &ip_hdr(skb)->saddr, 68be6e6707SDavid Howells sizeof(struct in_addr)); 69be6e6707SDavid Howells break; 70be6e6707SDavid Howells } 71be6e6707SDavid Howells break; 72be6e6707SDavid Howells 73d1912747SDavid Howells #ifdef CONFIG_AF_RXRPC_IPV6 7475b54cb5SDavid Howells case AF_INET6: 7575b54cb5SDavid Howells switch (serr->ee.ee_origin) { 7675b54cb5SDavid Howells case SO_EE_ORIGIN_ICMP6: 7775b54cb5SDavid Howells _net("Rx ICMP6"); 7846894a13SDavid Howells srx->transport.sin6.sin6_port = serr->port; 79494337c9SDavid Howells memcpy(&srx->transport.sin6.sin6_addr, 8075b54cb5SDavid Howells skb_network_header(skb) + serr->addr_offset, 8175b54cb5SDavid Howells sizeof(struct in6_addr)); 8275b54cb5SDavid Howells break; 8375b54cb5SDavid Howells case SO_EE_ORIGIN_ICMP: 8475b54cb5SDavid Howells _net("Rx ICMP on v6 sock"); 8546894a13SDavid Howells srx->transport_len = sizeof(srx->transport.sin); 8646894a13SDavid Howells srx->transport.family = AF_INET; 8746894a13SDavid Howells srx->transport.sin.sin_port = serr->port; 8846894a13SDavid Howells memcpy(&srx->transport.sin.sin_addr, 8975b54cb5SDavid Howells skb_network_header(skb) + serr->addr_offset, 9075b54cb5SDavid Howells sizeof(struct in_addr)); 9175b54cb5SDavid Howells break; 9275b54cb5SDavid Howells default: 93494337c9SDavid Howells memcpy(&srx->transport.sin6.sin6_addr, 9475b54cb5SDavid Howells &ipv6_hdr(skb)->saddr, 9575b54cb5SDavid Howells sizeof(struct in6_addr)); 9675b54cb5SDavid Howells break; 9775b54cb5SDavid Howells } 9875b54cb5SDavid Howells break; 99d1912747SDavid Howells #endif 10075b54cb5SDavid Howells 101be6e6707SDavid Howells default: 102be6e6707SDavid Howells BUG(); 103be6e6707SDavid Howells } 104be6e6707SDavid Howells 105494337c9SDavid Howells return rxrpc_lookup_peer_rcu(local, srx); 106be6e6707SDavid Howells } 107be6e6707SDavid Howells 108be6e6707SDavid Howells /* 1091a70c05bSDavid Howells * Handle an MTU/fragmentation problem. 1101a70c05bSDavid Howells */ 1111a70c05bSDavid Howells static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, struct sock_exterr_skb *serr) 1121a70c05bSDavid Howells { 1131a70c05bSDavid Howells u32 mtu = serr->ee.ee_info; 1141a70c05bSDavid Howells 1151a70c05bSDavid Howells _net("Rx ICMP Fragmentation Needed (%d)", mtu); 1161a70c05bSDavid Howells 1171a70c05bSDavid Howells /* wind down the local interface MTU */ 1181a70c05bSDavid Howells if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) { 1191a70c05bSDavid Howells peer->if_mtu = mtu; 1201a70c05bSDavid Howells _net("I/F MTU %u", mtu); 1211a70c05bSDavid Howells } 1221a70c05bSDavid Howells 1231a70c05bSDavid Howells if (mtu == 0) { 1241a70c05bSDavid Howells /* they didn't give us a size, estimate one */ 1251a70c05bSDavid Howells mtu = peer->if_mtu; 1261a70c05bSDavid Howells if (mtu > 1500) { 1271a70c05bSDavid Howells mtu >>= 1; 1281a70c05bSDavid Howells if (mtu < 1500) 1291a70c05bSDavid Howells mtu = 1500; 1301a70c05bSDavid Howells } else { 1311a70c05bSDavid Howells mtu -= 100; 1321a70c05bSDavid Howells if (mtu < peer->hdrsize) 1331a70c05bSDavid Howells mtu = peer->hdrsize + 4; 1341a70c05bSDavid Howells } 1351a70c05bSDavid Howells } 1361a70c05bSDavid Howells 1371a70c05bSDavid Howells if (mtu < peer->mtu) { 1381a70c05bSDavid Howells spin_lock_bh(&peer->lock); 1391a70c05bSDavid Howells peer->mtu = mtu; 1401a70c05bSDavid Howells peer->maxdata = peer->mtu - peer->hdrsize; 1411a70c05bSDavid Howells spin_unlock_bh(&peer->lock); 1421a70c05bSDavid Howells _net("Net MTU %u (maxdata %u)", 1431a70c05bSDavid Howells peer->mtu, peer->maxdata); 1441a70c05bSDavid Howells } 1451a70c05bSDavid Howells } 1461a70c05bSDavid Howells 1471a70c05bSDavid Howells /* 148f66d7490SDavid Howells * Handle an error received on the local endpoint. 1498c3e34a4SDavid Howells */ 150abe89ef0SDavid Howells void rxrpc_error_report(struct sock *sk) 1518c3e34a4SDavid Howells { 1528c3e34a4SDavid Howells struct sock_exterr_skb *serr; 153494337c9SDavid Howells struct sockaddr_rxrpc srx; 1548c3e34a4SDavid Howells struct rxrpc_local *local = sk->sk_user_data; 1558c3e34a4SDavid Howells struct rxrpc_peer *peer; 1568c3e34a4SDavid Howells struct sk_buff *skb; 1578c3e34a4SDavid Howells 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) { 1678c3e34a4SDavid Howells _leave("UDP socket errqueue empty"); 1688c3e34a4SDavid Howells return; 1698c3e34a4SDavid Howells } 17071f3ca40SDavid Howells rxrpc_new_skb(skb, rxrpc_skb_rx_received); 1718c3e34a4SDavid Howells serr = SKB_EXT_ERR(skb); 1728c3e34a4SDavid Howells if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) { 1738c3e34a4SDavid Howells _leave("UDP empty message"); 17471f3ca40SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_rx_freed); 1758c3e34a4SDavid Howells return; 1768c3e34a4SDavid Howells } 1778c3e34a4SDavid Howells 178be6e6707SDavid Howells rcu_read_lock(); 179494337c9SDavid Howells peer = rxrpc_lookup_peer_icmp_rcu(local, skb, &srx); 180be6e6707SDavid Howells if (peer && !rxrpc_get_peer_maybe(peer)) 181be6e6707SDavid Howells peer = NULL; 182be6e6707SDavid Howells if (!peer) { 183be6e6707SDavid Howells rcu_read_unlock(); 18471f3ca40SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_rx_freed); 1858c3e34a4SDavid Howells _leave(" [no peer]"); 1868c3e34a4SDavid Howells return; 1878c3e34a4SDavid Howells } 1888c3e34a4SDavid Howells 189494337c9SDavid Howells trace_rxrpc_rx_icmp(peer, &serr->ee, &srx); 190494337c9SDavid Howells 1911a70c05bSDavid Howells if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP && 1928c3e34a4SDavid Howells serr->ee.ee_type == ICMP_DEST_UNREACH && 1931a70c05bSDavid Howells serr->ee.ee_code == ICMP_FRAG_NEEDED)) { 1941a70c05bSDavid Howells rxrpc_adjust_mtu(peer, serr); 195be6e6707SDavid Howells rcu_read_unlock(); 19671f3ca40SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_rx_freed); 1978c3e34a4SDavid Howells rxrpc_put_peer(peer); 198f66d7490SDavid Howells _leave(" [MTU update]"); 199f66d7490SDavid Howells return; 2001a70c05bSDavid Howells } 201f66d7490SDavid Howells 202f66d7490SDavid Howells rxrpc_store_error(peer, serr); 203f66d7490SDavid Howells rcu_read_unlock(); 20471f3ca40SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_rx_freed); 2051890fea7SDavid Howells rxrpc_put_peer(peer); 206f66d7490SDavid Howells 2078c3e34a4SDavid Howells _leave(""); 2088c3e34a4SDavid Howells } 2098c3e34a4SDavid Howells 2108c3e34a4SDavid Howells /* 211f66d7490SDavid Howells * Map an error report to error codes on the peer record. 2128c3e34a4SDavid Howells */ 213f66d7490SDavid Howells static void rxrpc_store_error(struct rxrpc_peer *peer, 214f66d7490SDavid Howells struct sock_exterr_skb *serr) 2158c3e34a4SDavid Howells { 216f3344303SDavid Howells enum rxrpc_call_completion compl = RXRPC_CALL_NETWORK_ERROR; 2178c3e34a4SDavid Howells struct sock_extended_err *ee; 2188c3e34a4SDavid Howells int err; 2198c3e34a4SDavid Howells 2208c3e34a4SDavid Howells _enter(""); 2218c3e34a4SDavid Howells 2228c3e34a4SDavid Howells ee = &serr->ee; 2238c3e34a4SDavid Howells 2248c3e34a4SDavid Howells err = ee->ee_errno; 2258c3e34a4SDavid Howells 2268c3e34a4SDavid Howells switch (ee->ee_origin) { 2278c3e34a4SDavid Howells case SO_EE_ORIGIN_ICMP: 2288c3e34a4SDavid Howells switch (ee->ee_type) { 2298c3e34a4SDavid Howells case ICMP_DEST_UNREACH: 2308c3e34a4SDavid Howells switch (ee->ee_code) { 2318c3e34a4SDavid Howells case ICMP_NET_UNREACH: 2328c3e34a4SDavid Howells _net("Rx Received ICMP Network Unreachable"); 2338c3e34a4SDavid Howells break; 2348c3e34a4SDavid Howells case ICMP_HOST_UNREACH: 2358c3e34a4SDavid Howells _net("Rx Received ICMP Host Unreachable"); 2368c3e34a4SDavid Howells break; 2378c3e34a4SDavid Howells case ICMP_PORT_UNREACH: 2388c3e34a4SDavid Howells _net("Rx Received ICMP Port Unreachable"); 2398c3e34a4SDavid Howells break; 2408c3e34a4SDavid Howells case ICMP_NET_UNKNOWN: 2418c3e34a4SDavid Howells _net("Rx Received ICMP Unknown Network"); 2428c3e34a4SDavid Howells break; 2438c3e34a4SDavid Howells case ICMP_HOST_UNKNOWN: 2448c3e34a4SDavid Howells _net("Rx Received ICMP Unknown Host"); 2458c3e34a4SDavid Howells break; 2468c3e34a4SDavid Howells default: 2478c3e34a4SDavid Howells _net("Rx Received ICMP DestUnreach code=%u", 2488c3e34a4SDavid Howells ee->ee_code); 2498c3e34a4SDavid Howells break; 2508c3e34a4SDavid Howells } 2518c3e34a4SDavid Howells break; 2528c3e34a4SDavid Howells 2538c3e34a4SDavid Howells case ICMP_TIME_EXCEEDED: 2548c3e34a4SDavid Howells _net("Rx Received ICMP TTL Exceeded"); 2558c3e34a4SDavid Howells break; 2568c3e34a4SDavid Howells 2578c3e34a4SDavid Howells default: 2588c3e34a4SDavid Howells _proto("Rx Received ICMP error { type=%u code=%u }", 2598c3e34a4SDavid Howells ee->ee_type, ee->ee_code); 2608c3e34a4SDavid Howells break; 2618c3e34a4SDavid Howells } 2628c3e34a4SDavid Howells break; 2638c3e34a4SDavid Howells 264f66d7490SDavid Howells case SO_EE_ORIGIN_NONE: 2658c3e34a4SDavid Howells case SO_EE_ORIGIN_LOCAL: 266fe77d5fcSDavid Howells _proto("Rx Received local error { error=%d }", err); 267f3344303SDavid Howells compl = RXRPC_CALL_LOCAL_ERROR; 2688c3e34a4SDavid Howells break; 2698c3e34a4SDavid Howells 2708c3e34a4SDavid Howells case SO_EE_ORIGIN_ICMP6: 2718c3e34a4SDavid Howells default: 272fe77d5fcSDavid Howells _proto("Rx Received error report { orig=%u }", ee->ee_origin); 2738c3e34a4SDavid Howells break; 2748c3e34a4SDavid Howells } 2758c3e34a4SDavid Howells 276f3344303SDavid Howells rxrpc_distribute_error(peer, err, compl); 277f66d7490SDavid Howells } 2788c3e34a4SDavid Howells 279f66d7490SDavid Howells /* 280f3344303SDavid Howells * Distribute an error that occurred on a peer. 281f66d7490SDavid Howells */ 282f3344303SDavid Howells static void rxrpc_distribute_error(struct rxrpc_peer *peer, int error, 283f3344303SDavid Howells enum rxrpc_call_completion compl) 284f66d7490SDavid Howells { 285f66d7490SDavid Howells struct rxrpc_call *call; 2868c3e34a4SDavid Howells 287f3344303SDavid Howells hlist_for_each_entry_rcu(call, &peer->error_targets, error_link) { 288e34d4234SDavid Howells rxrpc_see_call(call); 289f3344303SDavid Howells if (call->state < RXRPC_CALL_COMPLETE && 290f3344303SDavid Howells rxrpc_set_call_completion(call, compl, 0, -error)) 291248f219cSDavid Howells rxrpc_notify_socket(call); 2928c3e34a4SDavid Howells } 2938c3e34a4SDavid Howells } 294cf1a6474SDavid Howells 295cf1a6474SDavid Howells /* 296cf1a6474SDavid Howells * Add RTT information to cache. This is called in softirq mode and has 297cf1a6474SDavid Howells * exclusive access to the peer RTT data. 298cf1a6474SDavid Howells */ 299cf1a6474SDavid Howells void rxrpc_peer_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why, 300cf1a6474SDavid Howells rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial, 301cf1a6474SDavid Howells ktime_t send_time, ktime_t resp_time) 302cf1a6474SDavid Howells { 303cf1a6474SDavid Howells struct rxrpc_peer *peer = call->peer; 304cf1a6474SDavid Howells s64 rtt; 305cf1a6474SDavid Howells u64 sum = peer->rtt_sum, avg; 306cf1a6474SDavid Howells u8 cursor = peer->rtt_cursor, usage = peer->rtt_usage; 307cf1a6474SDavid Howells 308cf1a6474SDavid Howells rtt = ktime_to_ns(ktime_sub(resp_time, send_time)); 309cf1a6474SDavid Howells if (rtt < 0) 310cf1a6474SDavid Howells return; 311cf1a6474SDavid Howells 312c1e15b49SDavid Howells spin_lock(&peer->rtt_input_lock); 313c1e15b49SDavid Howells 314cf1a6474SDavid Howells /* Replace the oldest datum in the RTT buffer */ 315cf1a6474SDavid Howells sum -= peer->rtt_cache[cursor]; 316cf1a6474SDavid Howells sum += rtt; 317cf1a6474SDavid Howells peer->rtt_cache[cursor] = rtt; 318cf1a6474SDavid Howells peer->rtt_cursor = (cursor + 1) & (RXRPC_RTT_CACHE_SIZE - 1); 319cf1a6474SDavid Howells peer->rtt_sum = sum; 320cf1a6474SDavid Howells if (usage < RXRPC_RTT_CACHE_SIZE) { 321cf1a6474SDavid Howells usage++; 322cf1a6474SDavid Howells peer->rtt_usage = usage; 323cf1a6474SDavid Howells } 324cf1a6474SDavid Howells 325c1e15b49SDavid Howells spin_unlock(&peer->rtt_input_lock); 326c1e15b49SDavid Howells 327cf1a6474SDavid Howells /* Now recalculate the average */ 328cf1a6474SDavid Howells if (usage == RXRPC_RTT_CACHE_SIZE) { 329cf1a6474SDavid Howells avg = sum / RXRPC_RTT_CACHE_SIZE; 330cf1a6474SDavid Howells } else { 331cf1a6474SDavid Howells avg = sum; 332cf1a6474SDavid Howells do_div(avg, usage); 333cf1a6474SDavid Howells } 334cf1a6474SDavid Howells 335c1e15b49SDavid Howells /* Don't need to update this under lock */ 336cf1a6474SDavid Howells peer->rtt = avg; 337cf1a6474SDavid Howells trace_rxrpc_rtt_rx(call, why, send_serial, resp_serial, rtt, 338cf1a6474SDavid Howells usage, avg); 339cf1a6474SDavid Howells } 340ace45becSDavid Howells 341ace45becSDavid Howells /* 342330bdcfaSDavid Howells * Perform keep-alive pings. 343330bdcfaSDavid Howells */ 344330bdcfaSDavid Howells static void rxrpc_peer_keepalive_dispatch(struct rxrpc_net *rxnet, 345330bdcfaSDavid Howells struct list_head *collector, 346330bdcfaSDavid Howells time64_t base, 347330bdcfaSDavid Howells u8 cursor) 348330bdcfaSDavid Howells { 349330bdcfaSDavid Howells struct rxrpc_peer *peer; 350330bdcfaSDavid Howells const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1; 351330bdcfaSDavid Howells time64_t keepalive_at; 352330bdcfaSDavid Howells int slot; 353330bdcfaSDavid Howells 354330bdcfaSDavid Howells spin_lock_bh(&rxnet->peer_hash_lock); 355330bdcfaSDavid Howells 356330bdcfaSDavid Howells while (!list_empty(collector)) { 357330bdcfaSDavid Howells peer = list_entry(collector->next, 358330bdcfaSDavid Howells struct rxrpc_peer, keepalive_link); 359330bdcfaSDavid Howells 360330bdcfaSDavid Howells list_del_init(&peer->keepalive_link); 361330bdcfaSDavid Howells if (!rxrpc_get_peer_maybe(peer)) 362330bdcfaSDavid Howells continue; 363330bdcfaSDavid Howells 364330bdcfaSDavid Howells spin_unlock_bh(&rxnet->peer_hash_lock); 365330bdcfaSDavid Howells 366330bdcfaSDavid Howells keepalive_at = peer->last_tx_at + RXRPC_KEEPALIVE_TIME; 367330bdcfaSDavid Howells slot = keepalive_at - base; 368330bdcfaSDavid Howells _debug("%02x peer %u t=%d {%pISp}", 369330bdcfaSDavid Howells cursor, peer->debug_id, slot, &peer->srx.transport); 370330bdcfaSDavid Howells 371330bdcfaSDavid Howells if (keepalive_at <= base || 372330bdcfaSDavid Howells keepalive_at > base + RXRPC_KEEPALIVE_TIME) { 373330bdcfaSDavid Howells rxrpc_send_keepalive(peer); 374330bdcfaSDavid Howells slot = RXRPC_KEEPALIVE_TIME; 375330bdcfaSDavid Howells } 376330bdcfaSDavid Howells 377330bdcfaSDavid Howells /* A transmission to this peer occurred since last we examined 378330bdcfaSDavid Howells * it so put it into the appropriate future bucket. 379330bdcfaSDavid Howells */ 380330bdcfaSDavid Howells slot += cursor; 381330bdcfaSDavid Howells slot &= mask; 382330bdcfaSDavid Howells spin_lock_bh(&rxnet->peer_hash_lock); 383330bdcfaSDavid Howells list_add_tail(&peer->keepalive_link, 384330bdcfaSDavid Howells &rxnet->peer_keepalive[slot & mask]); 385330bdcfaSDavid Howells rxrpc_put_peer(peer); 386330bdcfaSDavid Howells } 387330bdcfaSDavid Howells 388330bdcfaSDavid Howells spin_unlock_bh(&rxnet->peer_hash_lock); 389330bdcfaSDavid Howells } 390330bdcfaSDavid Howells 391330bdcfaSDavid Howells /* 392ace45becSDavid Howells * Perform keep-alive pings with VERSION packets to keep any NAT alive. 393ace45becSDavid Howells */ 394ace45becSDavid Howells void rxrpc_peer_keepalive_worker(struct work_struct *work) 395ace45becSDavid Howells { 396ace45becSDavid Howells struct rxrpc_net *rxnet = 397ace45becSDavid Howells container_of(work, struct rxrpc_net, peer_keepalive_work); 398330bdcfaSDavid Howells const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1; 399330bdcfaSDavid Howells time64_t base, now, delay; 400330bdcfaSDavid Howells u8 cursor, stop; 401330bdcfaSDavid Howells LIST_HEAD(collector); 402ace45becSDavid Howells 403330bdcfaSDavid Howells now = ktime_get_seconds(); 404ace45becSDavid Howells base = rxnet->peer_keepalive_base; 405ace45becSDavid Howells cursor = rxnet->peer_keepalive_cursor; 406330bdcfaSDavid Howells _enter("%lld,%u", base - now, cursor); 407ace45becSDavid Howells 408330bdcfaSDavid Howells if (!rxnet->live) 409330bdcfaSDavid Howells return; 410ace45becSDavid Howells 411330bdcfaSDavid Howells /* Remove to a temporary list all the peers that are currently lodged 412330bdcfaSDavid Howells * in expired buckets plus all new peers. 413330bdcfaSDavid Howells * 414330bdcfaSDavid Howells * Everything in the bucket at the cursor is processed this 415330bdcfaSDavid Howells * second; the bucket at cursor + 1 goes at now + 1s and so 416330bdcfaSDavid Howells * on... 417ace45becSDavid Howells */ 418ace45becSDavid Howells spin_lock_bh(&rxnet->peer_hash_lock); 419330bdcfaSDavid Howells list_splice_init(&rxnet->peer_keepalive_new, &collector); 420ace45becSDavid Howells 421330bdcfaSDavid Howells stop = cursor + ARRAY_SIZE(rxnet->peer_keepalive); 422330bdcfaSDavid Howells while (base <= now && (s8)(cursor - stop) < 0) { 423330bdcfaSDavid Howells list_splice_tail_init(&rxnet->peer_keepalive[cursor & mask], 424330bdcfaSDavid Howells &collector); 425330bdcfaSDavid Howells base++; 426ace45becSDavid Howells cursor++; 427330bdcfaSDavid Howells } 428ace45becSDavid Howells 429330bdcfaSDavid Howells base = now; 430330bdcfaSDavid Howells spin_unlock_bh(&rxnet->peer_hash_lock); 431330bdcfaSDavid Howells 432ace45becSDavid Howells rxnet->peer_keepalive_base = base; 433ace45becSDavid Howells rxnet->peer_keepalive_cursor = cursor; 434330bdcfaSDavid Howells rxrpc_peer_keepalive_dispatch(rxnet, &collector, base, cursor); 435330bdcfaSDavid Howells ASSERT(list_empty(&collector)); 436330bdcfaSDavid Howells 437330bdcfaSDavid Howells /* Schedule the timer for the next occupied timeslot. */ 438330bdcfaSDavid Howells cursor = rxnet->peer_keepalive_cursor; 439330bdcfaSDavid Howells stop = cursor + RXRPC_KEEPALIVE_TIME - 1; 440330bdcfaSDavid Howells for (; (s8)(cursor - stop) < 0; cursor++) { 441330bdcfaSDavid Howells if (!list_empty(&rxnet->peer_keepalive[cursor & mask])) 442330bdcfaSDavid Howells break; 443330bdcfaSDavid Howells base++; 444330bdcfaSDavid Howells } 445330bdcfaSDavid Howells 446330bdcfaSDavid Howells now = ktime_get_seconds(); 447330bdcfaSDavid Howells delay = base - now; 448330bdcfaSDavid Howells if (delay < 1) 449330bdcfaSDavid Howells delay = 1; 450330bdcfaSDavid Howells delay *= HZ; 451330bdcfaSDavid Howells if (rxnet->live) 452ace45becSDavid Howells timer_reduce(&rxnet->peer_keepalive_timer, jiffies + delay); 453330bdcfaSDavid Howells 454ace45becSDavid Howells _leave(""); 455ace45becSDavid Howells } 456