12522fe45SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 26ed7257bSPatrick Caulfield /****************************************************************************** 36ed7257bSPatrick Caulfield ******************************************************************************* 46ed7257bSPatrick Caulfield ** 56ed7257bSPatrick Caulfield ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 65e9ccc37SChristine Caulfield ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. 76ed7257bSPatrick Caulfield ** 86ed7257bSPatrick Caulfield ** 96ed7257bSPatrick Caulfield ******************************************************************************* 106ed7257bSPatrick Caulfield ******************************************************************************/ 116ed7257bSPatrick Caulfield 126ed7257bSPatrick Caulfield /* 136ed7257bSPatrick Caulfield * lowcomms.c 146ed7257bSPatrick Caulfield * 156ed7257bSPatrick Caulfield * This is the "low-level" comms layer. 166ed7257bSPatrick Caulfield * 176ed7257bSPatrick Caulfield * It is responsible for sending/receiving messages 186ed7257bSPatrick Caulfield * from other nodes in the cluster. 196ed7257bSPatrick Caulfield * 206ed7257bSPatrick Caulfield * Cluster nodes are referred to by their nodeids. nodeids are 216ed7257bSPatrick Caulfield * simply 32 bit numbers to the locking module - if they need to 222cf12c0bSJoe Perches * be expanded for the cluster infrastructure then that is its 236ed7257bSPatrick Caulfield * responsibility. It is this layer's 246ed7257bSPatrick Caulfield * responsibility to resolve these into IP address or 256ed7257bSPatrick Caulfield * whatever it needs for inter-node communication. 266ed7257bSPatrick Caulfield * 276ed7257bSPatrick Caulfield * The comms level is two kernel threads that deal mainly with 286ed7257bSPatrick Caulfield * the receiving of messages from other nodes and passing them 296ed7257bSPatrick Caulfield * up to the mid-level comms layer (which understands the 306ed7257bSPatrick Caulfield * message format) for execution by the locking core, and 316ed7257bSPatrick Caulfield * a send thread which does all the setting up of connections 326ed7257bSPatrick Caulfield * to remote nodes and the sending of data. Threads are not allowed 336ed7257bSPatrick Caulfield * to send their own data because it may cause them to wait in times 346ed7257bSPatrick Caulfield * of high load. Also, this way, the sending thread can collect together 356ed7257bSPatrick Caulfield * messages bound for one node and send them in one block. 366ed7257bSPatrick Caulfield * 372cf12c0bSJoe Perches * lowcomms will choose to use either TCP or SCTP as its transport layer 386ed7257bSPatrick Caulfield * depending on the configuration variable 'protocol'. This should be set 396ed7257bSPatrick Caulfield * to 0 (default) for TCP or 1 for SCTP. It should be configured using a 406ed7257bSPatrick Caulfield * cluster-wide mechanism as it must be the same on all nodes of the cluster 416ed7257bSPatrick Caulfield * for the DLM to function. 426ed7257bSPatrick Caulfield * 436ed7257bSPatrick Caulfield */ 446ed7257bSPatrick Caulfield 456ed7257bSPatrick Caulfield #include <asm/ioctls.h> 466ed7257bSPatrick Caulfield #include <net/sock.h> 476ed7257bSPatrick Caulfield #include <net/tcp.h> 486ed7257bSPatrick Caulfield #include <linux/pagemap.h> 496ed7257bSPatrick Caulfield #include <linux/file.h> 507a936ce7SMatthias Kaehlcke #include <linux/mutex.h> 516ed7257bSPatrick Caulfield #include <linux/sctp.h> 525a0e3ad6STejun Heo #include <linux/slab.h> 532f2d76ccSBenjamin Poirier #include <net/sctp/sctp.h> 5444ad532bSJoe Perches #include <net/ipv6.h> 556ed7257bSPatrick Caulfield 5692732376SAlexander Aring #include <trace/events/dlm.h> 5792732376SAlexander Aring 586ed7257bSPatrick Caulfield #include "dlm_internal.h" 596ed7257bSPatrick Caulfield #include "lowcomms.h" 606ed7257bSPatrick Caulfield #include "midcomms.h" 613af2326cSAlexander Aring #include "memory.h" 626ed7257bSPatrick Caulfield #include "config.h" 636ed7257bSPatrick Caulfield 646ed7257bSPatrick Caulfield #define NEEDED_RMEM (4*1024*1024) 656ed7257bSPatrick Caulfield 666ed7257bSPatrick Caulfield struct connection { 676ed7257bSPatrick Caulfield struct socket *sock; /* NULL if not connected */ 686ed7257bSPatrick Caulfield uint32_t nodeid; /* So we know who we are in the list */ 69dbb751ffSAlexander Aring /* this semaphore is used to allow parallel recv/send in read 70dbb751ffSAlexander Aring * lock mode. When we release a sock we need to held the write lock. 71dbb751ffSAlexander Aring * 72dbb751ffSAlexander Aring * However this is locking code and not nice. When we remove the 73dbb751ffSAlexander Aring * othercon handling we can look into other mechanism to synchronize 74dbb751ffSAlexander Aring * io handling to call sock_release() at the right time. 75dbb751ffSAlexander Aring */ 76dbb751ffSAlexander Aring struct rw_semaphore sock_lock; 776ed7257bSPatrick Caulfield unsigned long flags; 78dbb751ffSAlexander Aring #define CF_APP_LIMITED 0 79dbb751ffSAlexander Aring #define CF_RECV_PENDING 1 80dbb751ffSAlexander Aring #define CF_SEND_PENDING 2 81dbb751ffSAlexander Aring #define CF_RECV_INTR 3 82dbb751ffSAlexander Aring #define CF_IO_STOP 4 836ed7257bSPatrick Caulfield #define CF_IS_OTHERCON 5 846ed7257bSPatrick Caulfield struct list_head writequeue; /* List of outgoing writequeue_entries */ 856ed7257bSPatrick Caulfield spinlock_t writequeue_lock; 866ed7257bSPatrick Caulfield int retries; 875e9ccc37SChristine Caulfield struct hlist_node list; 88dbb751ffSAlexander Aring /* due some connect()/accept() races we currently have this cross over 89dbb751ffSAlexander Aring * connection attempt second connection for one node. 90dbb751ffSAlexander Aring * 91dbb751ffSAlexander Aring * There is a solution to avoid the race by introducing a connect 92dbb751ffSAlexander Aring * rule as e.g. our_nodeid > nodeid_to_connect who is allowed to 93dbb751ffSAlexander Aring * connect. Otherside can connect but will only be considered that 94dbb751ffSAlexander Aring * the other side wants to have a reconnect. 95dbb751ffSAlexander Aring * 96dbb751ffSAlexander Aring * However changing to this behaviour will break backwards compatible. 97dbb751ffSAlexander Aring * In a DLM protocol major version upgrade we should remove this! 98dbb751ffSAlexander Aring */ 996ed7257bSPatrick Caulfield struct connection *othercon; 100dbb751ffSAlexander Aring struct work_struct rwork; /* receive worker */ 101dbb751ffSAlexander Aring struct work_struct swork; /* send worker */ 102dbb751ffSAlexander Aring unsigned char rx_leftover_buf[DLM_MAX_SOCKET_BUFSIZE]; 1034798cbbfSAlexander Aring int rx_leftover; 1046f0b0b5dSAlexander Aring int mark; 1056f0b0b5dSAlexander Aring int addr_count; 1066f0b0b5dSAlexander Aring int curr_addr_index; 1076f0b0b5dSAlexander Aring struct sockaddr_storage addr[DLM_MAX_ADDR_COUNT]; 1086f0b0b5dSAlexander Aring spinlock_t addrs_lock; 109a47666ebSAlexander Aring struct rcu_head rcu; 1106ed7257bSPatrick Caulfield }; 1116ed7257bSPatrick Caulfield #define sock2con(x) ((struct connection *)(x)->sk_user_data) 1126ed7257bSPatrick Caulfield 113d11ccd45SAlexander Aring struct listen_connection { 114d11ccd45SAlexander Aring struct socket *sock; 115d11ccd45SAlexander Aring struct work_struct rwork; 116d11ccd45SAlexander Aring }; 117d11ccd45SAlexander Aring 118f0747ebfSAlexander Aring #define DLM_WQ_REMAIN_BYTES(e) (PAGE_SIZE - e->end) 119f0747ebfSAlexander Aring #define DLM_WQ_LENGTH_BYTES(e) (e->end - e->offset) 120f0747ebfSAlexander Aring 1216ed7257bSPatrick Caulfield /* An entry waiting to be sent */ 1226ed7257bSPatrick Caulfield struct writequeue_entry { 1236ed7257bSPatrick Caulfield struct list_head list; 1246ed7257bSPatrick Caulfield struct page *page; 1256ed7257bSPatrick Caulfield int offset; 1266ed7257bSPatrick Caulfield int len; 1276ed7257bSPatrick Caulfield int end; 1286ed7257bSPatrick Caulfield int users; 129706474fbSAlexander Aring bool dirty; 1306ed7257bSPatrick Caulfield struct connection *con; 1318f2dc78dSAlexander Aring struct list_head msgs; 1328f2dc78dSAlexander Aring struct kref ref; 1338f2dc78dSAlexander Aring }; 1348f2dc78dSAlexander Aring 1358f2dc78dSAlexander Aring struct dlm_msg { 1368f2dc78dSAlexander Aring struct writequeue_entry *entry; 1372874d1a6SAlexander Aring struct dlm_msg *orig_msg; 1382874d1a6SAlexander Aring bool retransmit; 1398f2dc78dSAlexander Aring void *ppc; 1408f2dc78dSAlexander Aring int len; 1418f2dc78dSAlexander Aring int idx; /* new()/commit() idx exchange */ 1428f2dc78dSAlexander Aring 1438f2dc78dSAlexander Aring struct list_head list; 1448f2dc78dSAlexander Aring struct kref ref; 1456ed7257bSPatrick Caulfield }; 1466ed7257bSPatrick Caulfield 147dbb751ffSAlexander Aring struct processqueue_entry { 148dbb751ffSAlexander Aring unsigned char *buf; 149dbb751ffSAlexander Aring int nodeid; 150dbb751ffSAlexander Aring int buflen; 151dbb751ffSAlexander Aring 152dbb751ffSAlexander Aring struct list_head list; 153dbb751ffSAlexander Aring }; 154dbb751ffSAlexander Aring 155a66c008cSAlexander Aring struct dlm_proto_ops { 1568728a455SAlexander Aring bool try_new_addr; 1572dc6b115SAlexander Aring const char *name; 1582dc6b115SAlexander Aring int proto; 1592dc6b115SAlexander Aring 1608728a455SAlexander Aring int (*connect)(struct connection *con, struct socket *sock, 1618728a455SAlexander Aring struct sockaddr *addr, int addr_len); 1628728a455SAlexander Aring void (*sockopts)(struct socket *sock); 1638728a455SAlexander Aring int (*bind)(struct socket *sock); 1642dc6b115SAlexander Aring int (*listen_validate)(void); 1652dc6b115SAlexander Aring void (*listen_sockopts)(struct socket *sock); 1662dc6b115SAlexander Aring int (*listen_bind)(struct socket *sock); 167a66c008cSAlexander Aring }; 168a66c008cSAlexander Aring 169cc661fc9SBob Peterson static struct listen_sock_callbacks { 170cc661fc9SBob Peterson void (*sk_error_report)(struct sock *); 171cc661fc9SBob Peterson void (*sk_data_ready)(struct sock *); 172cc661fc9SBob Peterson void (*sk_state_change)(struct sock *); 173cc661fc9SBob Peterson void (*sk_write_space)(struct sock *); 174cc661fc9SBob Peterson } listen_sock; 175cc661fc9SBob Peterson 176d11ccd45SAlexander Aring static struct listen_connection listen_con; 177c51c9cd8SAlexander Aring static struct sockaddr_storage dlm_local_addr[DLM_MAX_ADDR_COUNT]; 1786ed7257bSPatrick Caulfield static int dlm_local_count; 1796ed7257bSPatrick Caulfield 1806ed7257bSPatrick Caulfield /* Work queues */ 181dbb751ffSAlexander Aring static struct workqueue_struct *io_workqueue; 182dbb751ffSAlexander Aring static struct workqueue_struct *process_workqueue; 1836ed7257bSPatrick Caulfield 1845e9ccc37SChristine Caulfield static struct hlist_head connection_hash[CONN_HASH_SIZE]; 185a47666ebSAlexander Aring static DEFINE_SPINLOCK(connections_lock); 186a47666ebSAlexander Aring DEFINE_STATIC_SRCU(connections_srcu); 1876ed7257bSPatrick Caulfield 188a66c008cSAlexander Aring static const struct dlm_proto_ops *dlm_proto_ops; 189a66c008cSAlexander Aring 190dbb751ffSAlexander Aring #define DLM_IO_SUCCESS 0 191dbb751ffSAlexander Aring #define DLM_IO_END 1 192dbb751ffSAlexander Aring #define DLM_IO_EOF 2 193dbb751ffSAlexander Aring #define DLM_IO_RESCHED 3 194dbb751ffSAlexander Aring 1956ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work); 1966ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work); 197dbb751ffSAlexander Aring static void process_dlm_messages(struct work_struct *work); 198dbb751ffSAlexander Aring 199dbb751ffSAlexander Aring static DECLARE_WORK(process_work, process_dlm_messages); 200dbb751ffSAlexander Aring static DEFINE_SPINLOCK(processqueue_lock); 201dbb751ffSAlexander Aring static bool process_dlm_messages_pending; 202dbb751ffSAlexander Aring static LIST_HEAD(processqueue); 2036ed7257bSPatrick Caulfield 2041037c2a9SAlexander Aring bool dlm_lowcomms_is_running(void) 2051037c2a9SAlexander Aring { 2061037c2a9SAlexander Aring return !!listen_con.sock; 2071037c2a9SAlexander Aring } 2081037c2a9SAlexander Aring 209dbb751ffSAlexander Aring static void lowcomms_queue_swork(struct connection *con) 210dbb751ffSAlexander Aring { 2117a5e9f1fSAlexander Aring assert_spin_locked(&con->writequeue_lock); 212dbb751ffSAlexander Aring 213dbb751ffSAlexander Aring if (!test_bit(CF_IO_STOP, &con->flags) && 214dbb751ffSAlexander Aring !test_bit(CF_APP_LIMITED, &con->flags) && 215dbb751ffSAlexander Aring !test_and_set_bit(CF_SEND_PENDING, &con->flags)) 216dbb751ffSAlexander Aring queue_work(io_workqueue, &con->swork); 217dbb751ffSAlexander Aring } 218dbb751ffSAlexander Aring 219dbb751ffSAlexander Aring static void lowcomms_queue_rwork(struct connection *con) 220dbb751ffSAlexander Aring { 2217a5e9f1fSAlexander Aring #ifdef CONFIG_LOCKDEP 222dbb751ffSAlexander Aring WARN_ON_ONCE(!lockdep_sock_is_held(con->sock->sk)); 2237a5e9f1fSAlexander Aring #endif 224dbb751ffSAlexander Aring 225dbb751ffSAlexander Aring if (!test_bit(CF_IO_STOP, &con->flags) && 226dbb751ffSAlexander Aring !test_and_set_bit(CF_RECV_PENDING, &con->flags)) 227dbb751ffSAlexander Aring queue_work(io_workqueue, &con->rwork); 228dbb751ffSAlexander Aring } 229dbb751ffSAlexander Aring 2303af2326cSAlexander Aring static void writequeue_entry_ctor(void *data) 2313af2326cSAlexander Aring { 2323af2326cSAlexander Aring struct writequeue_entry *entry = data; 2333af2326cSAlexander Aring 2343af2326cSAlexander Aring INIT_LIST_HEAD(&entry->msgs); 2353af2326cSAlexander Aring } 2363af2326cSAlexander Aring 2373af2326cSAlexander Aring struct kmem_cache *dlm_lowcomms_writequeue_cache_create(void) 2383af2326cSAlexander Aring { 2393af2326cSAlexander Aring return kmem_cache_create("dlm_writequeue", sizeof(struct writequeue_entry), 2403af2326cSAlexander Aring 0, 0, writequeue_entry_ctor); 2413af2326cSAlexander Aring } 2423af2326cSAlexander Aring 243e4dc81edSAlexander Aring struct kmem_cache *dlm_lowcomms_msg_cache_create(void) 244e4dc81edSAlexander Aring { 245e4dc81edSAlexander Aring return kmem_cache_create("dlm_msg", sizeof(struct dlm_msg), 0, 0, NULL); 246e4dc81edSAlexander Aring } 247e4dc81edSAlexander Aring 24866d5955aSAlexander Aring /* need to held writequeue_lock */ 24966d5955aSAlexander Aring static struct writequeue_entry *con_next_wq(struct connection *con) 25066d5955aSAlexander Aring { 25166d5955aSAlexander Aring struct writequeue_entry *e; 25266d5955aSAlexander Aring 253dd070a56SAlexander Aring e = list_first_entry_or_null(&con->writequeue, struct writequeue_entry, 25466d5955aSAlexander Aring list); 255bcbfea41SAlexander Aring /* if len is zero nothing is to send, if there are users filling 256bcbfea41SAlexander Aring * buffers we wait until the users are done so we can send more. 257bcbfea41SAlexander Aring */ 258dd070a56SAlexander Aring if (!e || e->users || e->len == 0) 25966d5955aSAlexander Aring return NULL; 26066d5955aSAlexander Aring 26166d5955aSAlexander Aring return e; 26266d5955aSAlexander Aring } 26366d5955aSAlexander Aring 264b38bc9c2SAlexander Aring static struct connection *__find_con(int nodeid, int r) 2655e9ccc37SChristine Caulfield { 2665e9ccc37SChristine Caulfield struct connection *con; 2675e9ccc37SChristine Caulfield 268a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[r], list) { 269b38bc9c2SAlexander Aring if (con->nodeid == nodeid) 2705e9ccc37SChristine Caulfield return con; 2715e9ccc37SChristine Caulfield } 272a47666ebSAlexander Aring 2735e9ccc37SChristine Caulfield return NULL; 2745e9ccc37SChristine Caulfield } 2755e9ccc37SChristine Caulfield 276dbb751ffSAlexander Aring static void dlm_con_init(struct connection *con, int nodeid) 2776ed7257bSPatrick Caulfield { 2786ed7257bSPatrick Caulfield con->nodeid = nodeid; 279dbb751ffSAlexander Aring init_rwsem(&con->sock_lock); 2806ed7257bSPatrick Caulfield INIT_LIST_HEAD(&con->writequeue); 2816ed7257bSPatrick Caulfield spin_lock_init(&con->writequeue_lock); 2826ed7257bSPatrick Caulfield INIT_WORK(&con->swork, process_send_sockets); 2836ed7257bSPatrick Caulfield INIT_WORK(&con->rwork, process_recv_sockets); 284dbb751ffSAlexander Aring spin_lock_init(&con->addrs_lock); 2856cde210aSAlexander Aring } 2866cde210aSAlexander Aring 2876cde210aSAlexander Aring /* 2886cde210aSAlexander Aring * If 'allocation' is zero then we don't attempt to create a new 2896cde210aSAlexander Aring * connection structure for this node. 2906cde210aSAlexander Aring */ 2916cde210aSAlexander Aring static struct connection *nodeid2con(int nodeid, gfp_t alloc) 2926cde210aSAlexander Aring { 2936cde210aSAlexander Aring struct connection *con, *tmp; 294dbb751ffSAlexander Aring int r; 2956cde210aSAlexander Aring 296b38bc9c2SAlexander Aring r = nodeid_hash(nodeid); 297b38bc9c2SAlexander Aring con = __find_con(nodeid, r); 2986cde210aSAlexander Aring if (con || !alloc) 2996cde210aSAlexander Aring return con; 3006cde210aSAlexander Aring 3016cde210aSAlexander Aring con = kzalloc(sizeof(*con), alloc); 3026cde210aSAlexander Aring if (!con) 3036cde210aSAlexander Aring return NULL; 3046cde210aSAlexander Aring 305dbb751ffSAlexander Aring dlm_con_init(con, nodeid); 3066cde210aSAlexander Aring 307a47666ebSAlexander Aring spin_lock(&connections_lock); 3084f2b30fdSAlexander Aring /* Because multiple workqueues/threads calls this function it can 3094f2b30fdSAlexander Aring * race on multiple cpu's. Instead of locking hot path __find_con() 3104f2b30fdSAlexander Aring * we just check in rare cases of recently added nodes again 3114f2b30fdSAlexander Aring * under protection of connections_lock. If this is the case we 3124f2b30fdSAlexander Aring * abort our connection creation and return the existing connection. 3134f2b30fdSAlexander Aring */ 314b38bc9c2SAlexander Aring tmp = __find_con(nodeid, r); 3154f2b30fdSAlexander Aring if (tmp) { 3164f2b30fdSAlexander Aring spin_unlock(&connections_lock); 3174f2b30fdSAlexander Aring kfree(con); 3184f2b30fdSAlexander Aring return tmp; 3194f2b30fdSAlexander Aring } 3204f2b30fdSAlexander Aring 321a47666ebSAlexander Aring hlist_add_head_rcu(&con->list, &connection_hash[r]); 322a47666ebSAlexander Aring spin_unlock(&connections_lock); 323a47666ebSAlexander Aring 3246ed7257bSPatrick Caulfield return con; 3256ed7257bSPatrick Caulfield } 3266ed7257bSPatrick Caulfield 32740c6b83eSAlexander Aring static int addr_compare(const struct sockaddr_storage *x, 32840c6b83eSAlexander Aring const struct sockaddr_storage *y) 32936b71a8bSDavid Teigland { 33036b71a8bSDavid Teigland switch (x->ss_family) { 33136b71a8bSDavid Teigland case AF_INET: { 33236b71a8bSDavid Teigland struct sockaddr_in *sinx = (struct sockaddr_in *)x; 33336b71a8bSDavid Teigland struct sockaddr_in *siny = (struct sockaddr_in *)y; 33436b71a8bSDavid Teigland if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 33536b71a8bSDavid Teigland return 0; 33636b71a8bSDavid Teigland if (sinx->sin_port != siny->sin_port) 33736b71a8bSDavid Teigland return 0; 33836b71a8bSDavid Teigland break; 33936b71a8bSDavid Teigland } 34036b71a8bSDavid Teigland case AF_INET6: { 34136b71a8bSDavid Teigland struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 34236b71a8bSDavid Teigland struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 34336b71a8bSDavid Teigland if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 34436b71a8bSDavid Teigland return 0; 34536b71a8bSDavid Teigland if (sinx->sin6_port != siny->sin6_port) 34636b71a8bSDavid Teigland return 0; 34736b71a8bSDavid Teigland break; 34836b71a8bSDavid Teigland } 34936b71a8bSDavid Teigland default: 35036b71a8bSDavid Teigland return 0; 35136b71a8bSDavid Teigland } 35236b71a8bSDavid Teigland return 1; 35336b71a8bSDavid Teigland } 35436b71a8bSDavid Teigland 35536b71a8bSDavid Teigland static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, 356e125fbebSAlexander Aring struct sockaddr *sa_out, bool try_new_addr, 357e125fbebSAlexander Aring unsigned int *mark) 35836b71a8bSDavid Teigland { 35936b71a8bSDavid Teigland struct sockaddr_storage sas; 3606f0b0b5dSAlexander Aring struct connection *con; 3616f0b0b5dSAlexander Aring int idx; 3626ed7257bSPatrick Caulfield 3636ed7257bSPatrick Caulfield if (!dlm_local_count) 3646ed7257bSPatrick Caulfield return -1; 3656ed7257bSPatrick Caulfield 3666f0b0b5dSAlexander Aring idx = srcu_read_lock(&connections_srcu); 3676f0b0b5dSAlexander Aring con = nodeid2con(nodeid, 0); 3686f0b0b5dSAlexander Aring if (!con) { 3696f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 3706f0b0b5dSAlexander Aring return -ENOENT; 3716f0b0b5dSAlexander Aring } 3726f0b0b5dSAlexander Aring 3736f0b0b5dSAlexander Aring spin_lock(&con->addrs_lock); 3746f0b0b5dSAlexander Aring if (!con->addr_count) { 3756f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 3766f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 3776f0b0b5dSAlexander Aring return -ENOENT; 3786f0b0b5dSAlexander Aring } 3796f0b0b5dSAlexander Aring 3806f0b0b5dSAlexander Aring memcpy(&sas, &con->addr[con->curr_addr_index], 381ee44b4bcSMarcelo Ricardo Leitner sizeof(struct sockaddr_storage)); 382ee44b4bcSMarcelo Ricardo Leitner 38398e1b60eSMike Christie if (try_new_addr) { 3846f0b0b5dSAlexander Aring con->curr_addr_index++; 3856f0b0b5dSAlexander Aring if (con->curr_addr_index == con->addr_count) 3866f0b0b5dSAlexander Aring con->curr_addr_index = 0; 38798e1b60eSMike Christie } 38836b71a8bSDavid Teigland 3896f0b0b5dSAlexander Aring *mark = con->mark; 3906f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 391e125fbebSAlexander Aring 39236b71a8bSDavid Teigland if (sas_out) 39336b71a8bSDavid Teigland memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); 39436b71a8bSDavid Teigland 3956f0b0b5dSAlexander Aring if (!sa_out) { 3966f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 39736b71a8bSDavid Teigland return 0; 3986f0b0b5dSAlexander Aring } 3996ed7257bSPatrick Caulfield 400c51c9cd8SAlexander Aring if (dlm_local_addr[0].ss_family == AF_INET) { 40136b71a8bSDavid Teigland struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; 40236b71a8bSDavid Teigland struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; 4036ed7257bSPatrick Caulfield ret4->sin_addr.s_addr = in4->sin_addr.s_addr; 4046ed7257bSPatrick Caulfield } else { 40536b71a8bSDavid Teigland struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; 40636b71a8bSDavid Teigland struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; 4074e3fd7a0SAlexey Dobriyan ret6->sin6_addr = in6->sin6_addr; 4086ed7257bSPatrick Caulfield } 4096ed7257bSPatrick Caulfield 4106f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 4116ed7257bSPatrick Caulfield return 0; 4126ed7257bSPatrick Caulfield } 4136ed7257bSPatrick Caulfield 414e125fbebSAlexander Aring static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid, 415e125fbebSAlexander Aring unsigned int *mark) 41636b71a8bSDavid Teigland { 4176f0b0b5dSAlexander Aring struct connection *con; 4186f0b0b5dSAlexander Aring int i, idx, addr_i; 41936b71a8bSDavid Teigland 4206f0b0b5dSAlexander Aring idx = srcu_read_lock(&connections_srcu); 4216f0b0b5dSAlexander Aring for (i = 0; i < CONN_HASH_SIZE; i++) { 4226f0b0b5dSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], list) { 4236f0b0b5dSAlexander Aring WARN_ON_ONCE(!con->addr_count); 42436b71a8bSDavid Teigland 4256f0b0b5dSAlexander Aring spin_lock(&con->addrs_lock); 4266f0b0b5dSAlexander Aring for (addr_i = 0; addr_i < con->addr_count; addr_i++) { 4276f0b0b5dSAlexander Aring if (addr_compare(&con->addr[addr_i], addr)) { 4286f0b0b5dSAlexander Aring *nodeid = con->nodeid; 4296f0b0b5dSAlexander Aring *mark = con->mark; 4306f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 4316f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 4326f0b0b5dSAlexander Aring return 0; 43336b71a8bSDavid Teigland } 43498e1b60eSMike Christie } 4356f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 43698e1b60eSMike Christie } 4376f0b0b5dSAlexander Aring } 4386f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 4396f0b0b5dSAlexander Aring 4406f0b0b5dSAlexander Aring return -ENOENT; 44136b71a8bSDavid Teigland } 44236b71a8bSDavid Teigland 4436f0b0b5dSAlexander Aring static bool dlm_lowcomms_con_has_addr(const struct connection *con, 4444f19d071SAlexander Aring const struct sockaddr_storage *addr) 4454f19d071SAlexander Aring { 4464f19d071SAlexander Aring int i; 4474f19d071SAlexander Aring 4486f0b0b5dSAlexander Aring for (i = 0; i < con->addr_count; i++) { 4496f0b0b5dSAlexander Aring if (addr_compare(&con->addr[i], addr)) 4504f19d071SAlexander Aring return true; 4514f19d071SAlexander Aring } 4524f19d071SAlexander Aring 4534f19d071SAlexander Aring return false; 4544f19d071SAlexander Aring } 4554f19d071SAlexander Aring 45636b71a8bSDavid Teigland int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) 45736b71a8bSDavid Teigland { 4586f0b0b5dSAlexander Aring struct connection *con; 4596f0b0b5dSAlexander Aring bool ret, idx; 46036b71a8bSDavid Teigland 4616f0b0b5dSAlexander Aring idx = srcu_read_lock(&connections_srcu); 4626f0b0b5dSAlexander Aring con = nodeid2con(nodeid, GFP_NOFS); 4636f0b0b5dSAlexander Aring if (!con) { 4646f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 46536b71a8bSDavid Teigland return -ENOMEM; 46636b71a8bSDavid Teigland } 46736b71a8bSDavid Teigland 4686f0b0b5dSAlexander Aring spin_lock(&con->addrs_lock); 4696f0b0b5dSAlexander Aring if (!con->addr_count) { 4706f0b0b5dSAlexander Aring memcpy(&con->addr[0], addr, sizeof(*addr)); 4716f0b0b5dSAlexander Aring con->addr_count = 1; 4726f0b0b5dSAlexander Aring con->mark = dlm_config.ci_mark; 4736f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 4746f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 47536b71a8bSDavid Teigland return 0; 47636b71a8bSDavid Teigland } 47736b71a8bSDavid Teigland 4786f0b0b5dSAlexander Aring ret = dlm_lowcomms_con_has_addr(con, addr); 4794f19d071SAlexander Aring if (ret) { 4806f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 4816f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 4824f19d071SAlexander Aring return -EEXIST; 4834f19d071SAlexander Aring } 4844f19d071SAlexander Aring 4856f0b0b5dSAlexander Aring if (con->addr_count >= DLM_MAX_ADDR_COUNT) { 4866f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 4876f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 48836b71a8bSDavid Teigland return -ENOSPC; 48936b71a8bSDavid Teigland } 49036b71a8bSDavid Teigland 4916f0b0b5dSAlexander Aring memcpy(&con->addr[con->addr_count++], addr, sizeof(*addr)); 4926f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 4936f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 49436b71a8bSDavid Teigland return 0; 49536b71a8bSDavid Teigland } 49636b71a8bSDavid Teigland 4976ed7257bSPatrick Caulfield /* Data available on socket or listen socket received a connect */ 498676d2369SDavid S. Miller static void lowcomms_data_ready(struct sock *sk) 4996ed7257bSPatrick Caulfield { 500e9dd5fd8SAlexander Aring struct connection *con = sock2con(sk); 50193eaadebStsutomu.owa@toshiba.co.jp 502dbb751ffSAlexander Aring set_bit(CF_RECV_INTR, &con->flags); 503dbb751ffSAlexander Aring lowcomms_queue_rwork(con); 504d11ccd45SAlexander Aring } 505d11ccd45SAlexander Aring 5066ed7257bSPatrick Caulfield static void lowcomms_write_space(struct sock *sk) 5076ed7257bSPatrick Caulfield { 508e9dd5fd8SAlexander Aring struct connection *con = sock2con(sk); 509b36930ddSDavid Miller 510b36930ddSDavid Miller clear_bit(SOCK_NOSPACE, &con->sock->flags); 511b36930ddSDavid Miller 512dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 513b36930ddSDavid Miller if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { 514b36930ddSDavid Miller con->sock->sk->sk_write_pending--; 5159cd3e072SEric Dumazet clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); 516b36930ddSDavid Miller } 517b36930ddSDavid Miller 518dbb751ffSAlexander Aring lowcomms_queue_swork(con); 519dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 5206ed7257bSPatrick Caulfield } 5216ed7257bSPatrick Caulfield 5226ed7257bSPatrick Caulfield static void lowcomms_state_change(struct sock *sk) 5236ed7257bSPatrick Caulfield { 524ee44b4bcSMarcelo Ricardo Leitner /* SCTP layer is not calling sk_data_ready when the connection 525dbb751ffSAlexander Aring * is done, so we catch the signal through here. 526ee44b4bcSMarcelo Ricardo Leitner */ 527ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown == RCV_SHUTDOWN) 528ee44b4bcSMarcelo Ricardo Leitner lowcomms_data_ready(sk); 5296ed7257bSPatrick Caulfield } 530dbb751ffSAlexander Aring 531dbb751ffSAlexander Aring static void lowcomms_listen_data_ready(struct sock *sk) 532dbb751ffSAlexander Aring { 533dbb751ffSAlexander Aring queue_work(io_workqueue, &listen_con.rwork); 534ee44b4bcSMarcelo Ricardo Leitner } 5356ed7257bSPatrick Caulfield 536391fbdc5SChristine Caulfield int dlm_lowcomms_connect_node(int nodeid) 537391fbdc5SChristine Caulfield { 538391fbdc5SChristine Caulfield struct connection *con; 539b38bc9c2SAlexander Aring int idx; 540391fbdc5SChristine Caulfield 541391fbdc5SChristine Caulfield if (nodeid == dlm_our_nodeid()) 542391fbdc5SChristine Caulfield return 0; 543391fbdc5SChristine Caulfield 544b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 5456f0b0b5dSAlexander Aring con = nodeid2con(nodeid, 0); 5466f0b0b5dSAlexander Aring if (WARN_ON_ONCE(!con)) { 547b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 5486f0b0b5dSAlexander Aring return -ENOENT; 549b38bc9c2SAlexander Aring } 550b38bc9c2SAlexander Aring 551dbb751ffSAlexander Aring down_read(&con->sock_lock); 552dbb751ffSAlexander Aring if (!con->sock) { 553dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 554dbb751ffSAlexander Aring lowcomms_queue_swork(con); 555dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 556dbb751ffSAlexander Aring } 557dbb751ffSAlexander Aring up_read(&con->sock_lock); 558b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 559b38bc9c2SAlexander Aring 560dbb751ffSAlexander Aring cond_resched(); 561391fbdc5SChristine Caulfield return 0; 562391fbdc5SChristine Caulfield } 563391fbdc5SChristine Caulfield 564e125fbebSAlexander Aring int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark) 565e125fbebSAlexander Aring { 5666f0b0b5dSAlexander Aring struct connection *con; 5676f0b0b5dSAlexander Aring int idx; 568e125fbebSAlexander Aring 5696f0b0b5dSAlexander Aring idx = srcu_read_lock(&connections_srcu); 5706f0b0b5dSAlexander Aring con = nodeid2con(nodeid, 0); 5716f0b0b5dSAlexander Aring if (!con) { 5726f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 573e125fbebSAlexander Aring return -ENOENT; 574e125fbebSAlexander Aring } 575e125fbebSAlexander Aring 5766f0b0b5dSAlexander Aring spin_lock(&con->addrs_lock); 5776f0b0b5dSAlexander Aring con->mark = mark; 5786f0b0b5dSAlexander Aring spin_unlock(&con->addrs_lock); 5796f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 580e125fbebSAlexander Aring return 0; 581e125fbebSAlexander Aring } 582e125fbebSAlexander Aring 583b3a5bbfdSBob Peterson static void lowcomms_error_report(struct sock *sk) 584b3a5bbfdSBob Peterson { 585e9dd5fd8SAlexander Aring struct connection *con = sock2con(sk); 5864c3d9057SAlexander Aring struct inet_sock *inet; 587b3a5bbfdSBob Peterson 5884c3d9057SAlexander Aring inet = inet_sk(sk); 5894c3d9057SAlexander Aring switch (sk->sk_family) { 5904c3d9057SAlexander Aring case AF_INET: 591b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 5924c3d9057SAlexander Aring "sending to node %d at %pI4, dport %d, " 593b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 5944c3d9057SAlexander Aring con->nodeid, &inet->inet_daddr, 5954c3d9057SAlexander Aring ntohs(inet->inet_dport), sk->sk_err, 596b3a5bbfdSBob Peterson sk->sk_err_soft); 5974c3d9057SAlexander Aring break; 5981b9beda8SAlexander Aring #if IS_ENABLED(CONFIG_IPV6) 5994c3d9057SAlexander Aring case AF_INET6: 600b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 6014c3d9057SAlexander Aring "sending to node %d at %pI6c, " 6024c3d9057SAlexander Aring "dport %d, sk_err=%d/%d\n", dlm_our_nodeid(), 6034c3d9057SAlexander Aring con->nodeid, &sk->sk_v6_daddr, 6044c3d9057SAlexander Aring ntohs(inet->inet_dport), sk->sk_err, 605b3a5bbfdSBob Peterson sk->sk_err_soft); 6064c3d9057SAlexander Aring break; 6071b9beda8SAlexander Aring #endif 6084c3d9057SAlexander Aring default: 6094c3d9057SAlexander Aring printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 6104c3d9057SAlexander Aring "invalid socket family %d set, " 6114c3d9057SAlexander Aring "sk_err=%d/%d\n", dlm_our_nodeid(), 6124c3d9057SAlexander Aring sk->sk_family, sk->sk_err, sk->sk_err_soft); 613ba868d9dSAlexander Aring break; 614ba868d9dSAlexander Aring } 615ba868d9dSAlexander Aring 616dbb751ffSAlexander Aring dlm_midcomms_unack_msg_resend(con->nodeid); 617ba868d9dSAlexander Aring 618c852a6d7SAlexander Aring listen_sock.sk_error_report(sk); 619b81171cbSBob Peterson } 620b81171cbSBob Peterson 621dbb751ffSAlexander Aring static void restore_callbacks(struct sock *sk) 622b81171cbSBob Peterson { 6237a5e9f1fSAlexander Aring #ifdef CONFIG_LOCKDEP 624dbb751ffSAlexander Aring WARN_ON_ONCE(!lockdep_sock_is_held(sk)); 6257a5e9f1fSAlexander Aring #endif 626cc661fc9SBob Peterson 627b81171cbSBob Peterson sk->sk_user_data = NULL; 628cc661fc9SBob Peterson sk->sk_data_ready = listen_sock.sk_data_ready; 629cc661fc9SBob Peterson sk->sk_state_change = listen_sock.sk_state_change; 630cc661fc9SBob Peterson sk->sk_write_space = listen_sock.sk_write_space; 631cc661fc9SBob Peterson sk->sk_error_report = listen_sock.sk_error_report; 632b3a5bbfdSBob Peterson } 633b3a5bbfdSBob Peterson 6346ed7257bSPatrick Caulfield /* Make a socket active */ 635988419a9Stsutomu.owa@toshiba.co.jp static void add_sock(struct socket *sock, struct connection *con) 6366ed7257bSPatrick Caulfield { 637b81171cbSBob Peterson struct sock *sk = sock->sk; 638b81171cbSBob Peterson 63992c44605SAlexander Aring lock_sock(sk); 6406ed7257bSPatrick Caulfield con->sock = sock; 6416ed7257bSPatrick Caulfield 642b81171cbSBob Peterson sk->sk_user_data = con; 643b81171cbSBob Peterson sk->sk_data_ready = lowcomms_data_ready; 644b81171cbSBob Peterson sk->sk_write_space = lowcomms_write_space; 645dbb751ffSAlexander Aring if (dlm_config.ci_protocol == DLM_PROTO_SCTP) 646b81171cbSBob Peterson sk->sk_state_change = lowcomms_state_change; 647b81171cbSBob Peterson sk->sk_allocation = GFP_NOFS; 648*98123866SBenjamin Coddington sk->sk_use_task_frag = false; 649b81171cbSBob Peterson sk->sk_error_report = lowcomms_error_report; 65092c44605SAlexander Aring release_sock(sk); 6516ed7257bSPatrick Caulfield } 6526ed7257bSPatrick Caulfield 6536ed7257bSPatrick Caulfield /* Add the port number to an IPv6 or 4 sockaddr and return the address 6546ed7257bSPatrick Caulfield length */ 6556ed7257bSPatrick Caulfield static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, 6566ed7257bSPatrick Caulfield int *addr_len) 6576ed7257bSPatrick Caulfield { 658c51c9cd8SAlexander Aring saddr->ss_family = dlm_local_addr[0].ss_family; 6596ed7257bSPatrick Caulfield if (saddr->ss_family == AF_INET) { 6606ed7257bSPatrick Caulfield struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; 6616ed7257bSPatrick Caulfield in4_addr->sin_port = cpu_to_be16(port); 6626ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in); 6636ed7257bSPatrick Caulfield memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); 6646ed7257bSPatrick Caulfield } else { 6656ed7257bSPatrick Caulfield struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; 6666ed7257bSPatrick Caulfield in6_addr->sin6_port = cpu_to_be16(port); 6676ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in6); 6686ed7257bSPatrick Caulfield } 66901c8cab2SPatrick Caulfield memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); 6706ed7257bSPatrick Caulfield } 6716ed7257bSPatrick Caulfield 672706474fbSAlexander Aring static void dlm_page_release(struct kref *kref) 673706474fbSAlexander Aring { 674706474fbSAlexander Aring struct writequeue_entry *e = container_of(kref, struct writequeue_entry, 675706474fbSAlexander Aring ref); 676706474fbSAlexander Aring 677706474fbSAlexander Aring __free_page(e->page); 6783af2326cSAlexander Aring dlm_free_writequeue(e); 679706474fbSAlexander Aring } 680706474fbSAlexander Aring 681706474fbSAlexander Aring static void dlm_msg_release(struct kref *kref) 682706474fbSAlexander Aring { 683706474fbSAlexander Aring struct dlm_msg *msg = container_of(kref, struct dlm_msg, ref); 684706474fbSAlexander Aring 685706474fbSAlexander Aring kref_put(&msg->entry->ref, dlm_page_release); 686e4dc81edSAlexander Aring dlm_free_msg(msg); 687706474fbSAlexander Aring } 688706474fbSAlexander Aring 689706474fbSAlexander Aring static void free_entry(struct writequeue_entry *e) 690706474fbSAlexander Aring { 691706474fbSAlexander Aring struct dlm_msg *msg, *tmp; 692706474fbSAlexander Aring 693706474fbSAlexander Aring list_for_each_entry_safe(msg, tmp, &e->msgs, list) { 694706474fbSAlexander Aring if (msg->orig_msg) { 695706474fbSAlexander Aring msg->orig_msg->retransmit = false; 696706474fbSAlexander Aring kref_put(&msg->orig_msg->ref, dlm_msg_release); 697706474fbSAlexander Aring } 698706474fbSAlexander Aring 699706474fbSAlexander Aring list_del(&msg->list); 700706474fbSAlexander Aring kref_put(&msg->ref, dlm_msg_release); 701706474fbSAlexander Aring } 702706474fbSAlexander Aring 703706474fbSAlexander Aring list_del(&e->list); 704706474fbSAlexander Aring kref_put(&e->ref, dlm_page_release); 705706474fbSAlexander Aring } 706706474fbSAlexander Aring 707d11ccd45SAlexander Aring static void dlm_close_sock(struct socket **sock) 708d11ccd45SAlexander Aring { 709dbb751ffSAlexander Aring lock_sock((*sock)->sk); 710dbb751ffSAlexander Aring restore_callbacks((*sock)->sk); 711dbb751ffSAlexander Aring release_sock((*sock)->sk); 712dbb751ffSAlexander Aring 713d11ccd45SAlexander Aring sock_release(*sock); 714d11ccd45SAlexander Aring *sock = NULL; 715d11ccd45SAlexander Aring } 716dbb751ffSAlexander Aring 717dbb751ffSAlexander Aring static void allow_connection_io(struct connection *con) 718dbb751ffSAlexander Aring { 719dbb751ffSAlexander Aring if (con->othercon) 720dbb751ffSAlexander Aring clear_bit(CF_IO_STOP, &con->othercon->flags); 721dbb751ffSAlexander Aring clear_bit(CF_IO_STOP, &con->flags); 722dbb751ffSAlexander Aring } 723dbb751ffSAlexander Aring 724dbb751ffSAlexander Aring static void stop_connection_io(struct connection *con) 725dbb751ffSAlexander Aring { 726dbb751ffSAlexander Aring if (con->othercon) 727dbb751ffSAlexander Aring stop_connection_io(con->othercon); 728dbb751ffSAlexander Aring 729dbb751ffSAlexander Aring down_write(&con->sock_lock); 730dbb751ffSAlexander Aring if (con->sock) { 731dbb751ffSAlexander Aring lock_sock(con->sock->sk); 732dbb751ffSAlexander Aring restore_callbacks(con->sock->sk); 733dbb751ffSAlexander Aring 734dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 735dbb751ffSAlexander Aring set_bit(CF_IO_STOP, &con->flags); 736dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 737dbb751ffSAlexander Aring release_sock(con->sock->sk); 738dbb751ffSAlexander Aring } else { 739dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 740dbb751ffSAlexander Aring set_bit(CF_IO_STOP, &con->flags); 741dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 742dbb751ffSAlexander Aring } 743dbb751ffSAlexander Aring up_write(&con->sock_lock); 744dbb751ffSAlexander Aring 745dbb751ffSAlexander Aring cancel_work_sync(&con->swork); 746dbb751ffSAlexander Aring cancel_work_sync(&con->rwork); 747d11ccd45SAlexander Aring } 748d11ccd45SAlexander Aring 7496ed7257bSPatrick Caulfield /* Close a remote connection and tidy up */ 750dbb751ffSAlexander Aring static void close_connection(struct connection *con, bool and_other) 7516ed7257bSPatrick Caulfield { 752706474fbSAlexander Aring struct writequeue_entry *e; 753b2a66629Stsutomu.owa@toshiba.co.jp 754dbb751ffSAlexander Aring if (con->othercon && and_other) 755dbb751ffSAlexander Aring close_connection(con->othercon, false); 756dbb751ffSAlexander Aring 757dbb751ffSAlexander Aring down_write(&con->sock_lock); 758dbb751ffSAlexander Aring if (!con->sock) { 759dbb751ffSAlexander Aring up_write(&con->sock_lock); 760dbb751ffSAlexander Aring return; 7610aa18464Stsutomu.owa@toshiba.co.jp } 7626ed7257bSPatrick Caulfield 763d11ccd45SAlexander Aring dlm_close_sock(&con->sock); 764d11ccd45SAlexander Aring 765706474fbSAlexander Aring /* if we send a writequeue entry only a half way, we drop the 766706474fbSAlexander Aring * whole entry because reconnection and that we not start of the 767706474fbSAlexander Aring * middle of a msg which will confuse the other end. 768706474fbSAlexander Aring * 769706474fbSAlexander Aring * we can always drop messages because retransmits, but what we 770706474fbSAlexander Aring * cannot allow is to transmit half messages which may be processed 771706474fbSAlexander Aring * at the other side. 772706474fbSAlexander Aring * 773706474fbSAlexander Aring * our policy is to start on a clean state when disconnects, we don't 774706474fbSAlexander Aring * know what's send/received on transport layer in this case. 775706474fbSAlexander Aring */ 776dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 777706474fbSAlexander Aring if (!list_empty(&con->writequeue)) { 778706474fbSAlexander Aring e = list_first_entry(&con->writequeue, struct writequeue_entry, 779706474fbSAlexander Aring list); 780706474fbSAlexander Aring if (e->dirty) 781706474fbSAlexander Aring free_entry(e); 782706474fbSAlexander Aring } 783dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 784706474fbSAlexander Aring 7854798cbbfSAlexander Aring con->rx_leftover = 0; 7866ed7257bSPatrick Caulfield con->retries = 0; 787052849beSAlexander Aring clear_bit(CF_APP_LIMITED, &con->flags); 788dbb751ffSAlexander Aring clear_bit(CF_RECV_PENDING, &con->flags); 789dbb751ffSAlexander Aring clear_bit(CF_SEND_PENDING, &con->flags); 790dbb751ffSAlexander Aring up_write(&con->sock_lock); 7916ed7257bSPatrick Caulfield } 7926ed7257bSPatrick Caulfield 793dbb751ffSAlexander Aring static struct processqueue_entry *new_processqueue_entry(int nodeid, 794dbb751ffSAlexander Aring int buflen) 7954798cbbfSAlexander Aring { 796dbb751ffSAlexander Aring struct processqueue_entry *pentry; 7974798cbbfSAlexander Aring 798dbb751ffSAlexander Aring pentry = kmalloc(sizeof(*pentry), GFP_NOFS); 799dbb751ffSAlexander Aring if (!pentry) 800dbb751ffSAlexander Aring return NULL; 8014798cbbfSAlexander Aring 802dbb751ffSAlexander Aring pentry->buf = kmalloc(buflen, GFP_NOFS); 803dbb751ffSAlexander Aring if (!pentry->buf) { 804dbb751ffSAlexander Aring kfree(pentry); 805dbb751ffSAlexander Aring return NULL; 806dbb751ffSAlexander Aring } 8074798cbbfSAlexander Aring 808dbb751ffSAlexander Aring pentry->nodeid = nodeid; 809dbb751ffSAlexander Aring return pentry; 810dbb751ffSAlexander Aring } 8114798cbbfSAlexander Aring 812dbb751ffSAlexander Aring static void free_processqueue_entry(struct processqueue_entry *pentry) 813dbb751ffSAlexander Aring { 814dbb751ffSAlexander Aring kfree(pentry->buf); 815dbb751ffSAlexander Aring kfree(pentry); 816dbb751ffSAlexander Aring } 817dbb751ffSAlexander Aring 818dbb751ffSAlexander Aring struct dlm_processed_nodes { 819dbb751ffSAlexander Aring int nodeid; 820dbb751ffSAlexander Aring 821dbb751ffSAlexander Aring struct list_head list; 822dbb751ffSAlexander Aring }; 823dbb751ffSAlexander Aring 824dbb751ffSAlexander Aring static void add_processed_node(int nodeid, struct list_head *processed_nodes) 825dbb751ffSAlexander Aring { 826dbb751ffSAlexander Aring struct dlm_processed_nodes *n; 827dbb751ffSAlexander Aring 828dbb751ffSAlexander Aring list_for_each_entry(n, processed_nodes, list) { 829dbb751ffSAlexander Aring /* we already remembered this node */ 830dbb751ffSAlexander Aring if (n->nodeid == nodeid) 831dbb751ffSAlexander Aring return; 832dbb751ffSAlexander Aring } 833dbb751ffSAlexander Aring 834dbb751ffSAlexander Aring /* if it's fails in worst case we simple don't send an ack back. 835dbb751ffSAlexander Aring * We try it next time. 836dbb751ffSAlexander Aring */ 837dbb751ffSAlexander Aring n = kmalloc(sizeof(*n), GFP_NOFS); 838dbb751ffSAlexander Aring if (!n) 839dbb751ffSAlexander Aring return; 840dbb751ffSAlexander Aring 841dbb751ffSAlexander Aring n->nodeid = nodeid; 842dbb751ffSAlexander Aring list_add(&n->list, processed_nodes); 843dbb751ffSAlexander Aring } 844dbb751ffSAlexander Aring 845dbb751ffSAlexander Aring static void process_dlm_messages(struct work_struct *work) 846dbb751ffSAlexander Aring { 847dbb751ffSAlexander Aring struct dlm_processed_nodes *n, *n_tmp; 848dbb751ffSAlexander Aring struct processqueue_entry *pentry; 849dbb751ffSAlexander Aring LIST_HEAD(processed_nodes); 850dbb751ffSAlexander Aring 851dbb751ffSAlexander Aring spin_lock(&processqueue_lock); 852dbb751ffSAlexander Aring pentry = list_first_entry_or_null(&processqueue, 853dbb751ffSAlexander Aring struct processqueue_entry, list); 854dbb751ffSAlexander Aring if (WARN_ON_ONCE(!pentry)) { 855dbb751ffSAlexander Aring spin_unlock(&processqueue_lock); 856dbb751ffSAlexander Aring return; 857dbb751ffSAlexander Aring } 858dbb751ffSAlexander Aring 859dbb751ffSAlexander Aring list_del(&pentry->list); 860dbb751ffSAlexander Aring spin_unlock(&processqueue_lock); 861dbb751ffSAlexander Aring 862dbb751ffSAlexander Aring for (;;) { 863dbb751ffSAlexander Aring dlm_process_incoming_buffer(pentry->nodeid, pentry->buf, 864dbb751ffSAlexander Aring pentry->buflen); 865dbb751ffSAlexander Aring add_processed_node(pentry->nodeid, &processed_nodes); 866dbb751ffSAlexander Aring free_processqueue_entry(pentry); 867dbb751ffSAlexander Aring 868dbb751ffSAlexander Aring spin_lock(&processqueue_lock); 869dbb751ffSAlexander Aring pentry = list_first_entry_or_null(&processqueue, 870dbb751ffSAlexander Aring struct processqueue_entry, list); 871dbb751ffSAlexander Aring if (!pentry) { 872dbb751ffSAlexander Aring process_dlm_messages_pending = false; 873dbb751ffSAlexander Aring spin_unlock(&processqueue_lock); 874dbb751ffSAlexander Aring break; 875dbb751ffSAlexander Aring } 876dbb751ffSAlexander Aring 877dbb751ffSAlexander Aring list_del(&pentry->list); 878dbb751ffSAlexander Aring spin_unlock(&processqueue_lock); 879dbb751ffSAlexander Aring } 880dbb751ffSAlexander Aring 881dbb751ffSAlexander Aring /* send ack back after we processed couple of messages */ 882dbb751ffSAlexander Aring list_for_each_entry_safe(n, n_tmp, &processed_nodes, list) { 883dbb751ffSAlexander Aring list_del(&n->list); 884dbb751ffSAlexander Aring dlm_midcomms_receive_done(n->nodeid); 885dbb751ffSAlexander Aring kfree(n); 886dbb751ffSAlexander Aring } 8874798cbbfSAlexander Aring } 8884798cbbfSAlexander Aring 8896ed7257bSPatrick Caulfield /* Data received from remote end */ 890dbb751ffSAlexander Aring static int receive_from_sock(struct connection *con, int buflen) 8916ed7257bSPatrick Caulfield { 892dbb751ffSAlexander Aring struct processqueue_entry *pentry; 893dbb751ffSAlexander Aring int ret, buflen_real; 8944798cbbfSAlexander Aring struct msghdr msg; 8954798cbbfSAlexander Aring struct kvec iov; 8966ed7257bSPatrick Caulfield 897dbb751ffSAlexander Aring pentry = new_processqueue_entry(con->nodeid, buflen); 898dbb751ffSAlexander Aring if (!pentry) 899dbb751ffSAlexander Aring return DLM_IO_RESCHED; 9006ed7257bSPatrick Caulfield 901dbb751ffSAlexander Aring memcpy(pentry->buf, con->rx_leftover_buf, con->rx_leftover); 9024798cbbfSAlexander Aring 9034798cbbfSAlexander Aring /* calculate new buffer parameter regarding last receive and 9044798cbbfSAlexander Aring * possible leftover bytes 9056ed7257bSPatrick Caulfield */ 906dbb751ffSAlexander Aring iov.iov_base = pentry->buf + con->rx_leftover; 907dbb751ffSAlexander Aring iov.iov_len = buflen - con->rx_leftover; 9086ed7257bSPatrick Caulfield 9094798cbbfSAlexander Aring memset(&msg, 0, sizeof(msg)); 9104798cbbfSAlexander Aring msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 911dbb751ffSAlexander Aring clear_bit(CF_RECV_INTR, &con->flags); 912dbb751ffSAlexander Aring again: 9134798cbbfSAlexander Aring ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len, 9144798cbbfSAlexander Aring msg.msg_flags); 91592732376SAlexander Aring trace_dlm_recv(con->nodeid, ret); 916dbb751ffSAlexander Aring if (ret == -EAGAIN) { 917dbb751ffSAlexander Aring lock_sock(con->sock->sk); 918dbb751ffSAlexander Aring if (test_and_clear_bit(CF_RECV_INTR, &con->flags)) { 919dbb751ffSAlexander Aring release_sock(con->sock->sk); 920dbb751ffSAlexander Aring goto again; 921dbb751ffSAlexander Aring } 922dbb751ffSAlexander Aring 923dbb751ffSAlexander Aring clear_bit(CF_RECV_PENDING, &con->flags); 924dbb751ffSAlexander Aring release_sock(con->sock->sk); 925dbb751ffSAlexander Aring free_processqueue_entry(pentry); 926dbb751ffSAlexander Aring return DLM_IO_END; 927dbb751ffSAlexander Aring } else if (ret == 0) { 928dbb751ffSAlexander Aring /* close will clear CF_RECV_PENDING */ 929dbb751ffSAlexander Aring free_processqueue_entry(pentry); 930dbb751ffSAlexander Aring return DLM_IO_EOF; 931dbb751ffSAlexander Aring } else if (ret < 0) { 932dbb751ffSAlexander Aring free_processqueue_entry(pentry); 933dbb751ffSAlexander Aring return ret; 934dbb751ffSAlexander Aring } 9356ed7257bSPatrick Caulfield 9364798cbbfSAlexander Aring /* new buflen according readed bytes and leftover from last receive */ 937dbb751ffSAlexander Aring buflen_real = ret + con->rx_leftover; 938dbb751ffSAlexander Aring ret = dlm_validate_incoming_buffer(con->nodeid, pentry->buf, 939dbb751ffSAlexander Aring buflen_real); 940dbb751ffSAlexander Aring if (ret < 0) { 941dbb751ffSAlexander Aring free_processqueue_entry(pentry); 942dbb751ffSAlexander Aring return ret; 943dbb751ffSAlexander Aring } 944dbb751ffSAlexander Aring 945dbb751ffSAlexander Aring pentry->buflen = ret; 9466ed7257bSPatrick Caulfield 9474798cbbfSAlexander Aring /* calculate leftover bytes from process and put it into begin of 9484798cbbfSAlexander Aring * the receive buffer, so next receive we have the full message 9494798cbbfSAlexander Aring * at the start address of the receive buffer. 9504798cbbfSAlexander Aring */ 951dbb751ffSAlexander Aring con->rx_leftover = buflen_real - ret; 952dbb751ffSAlexander Aring memmove(con->rx_leftover_buf, pentry->buf + ret, 9534798cbbfSAlexander Aring con->rx_leftover); 954dbb751ffSAlexander Aring 955dbb751ffSAlexander Aring spin_lock(&processqueue_lock); 956dbb751ffSAlexander Aring list_add_tail(&pentry->list, &processqueue); 957dbb751ffSAlexander Aring if (!process_dlm_messages_pending) { 958dbb751ffSAlexander Aring process_dlm_messages_pending = true; 959dbb751ffSAlexander Aring queue_work(process_workqueue, &process_work); 9606ed7257bSPatrick Caulfield } 961dbb751ffSAlexander Aring spin_unlock(&processqueue_lock); 9624798cbbfSAlexander Aring 963dbb751ffSAlexander Aring return DLM_IO_SUCCESS; 9646ed7257bSPatrick Caulfield } 9656ed7257bSPatrick Caulfield 9666ed7257bSPatrick Caulfield /* Listening socket is busy, accept a connection */ 967dbb751ffSAlexander Aring static int accept_from_sock(void) 9686ed7257bSPatrick Caulfield { 9696ed7257bSPatrick Caulfield struct sockaddr_storage peeraddr; 970dbb751ffSAlexander Aring int len, idx, result, nodeid; 9716ed7257bSPatrick Caulfield struct connection *newcon; 972dbb751ffSAlexander Aring struct socket *newsock; 9733f78cd7dSAlexander Aring unsigned int mark; 9746ed7257bSPatrick Caulfield 975dbb751ffSAlexander Aring result = kernel_accept(listen_con.sock, &newsock, O_NONBLOCK); 976dbb751ffSAlexander Aring if (result == -EAGAIN) 977dbb751ffSAlexander Aring return DLM_IO_END; 978dbb751ffSAlexander Aring else if (result < 0) 9796ed7257bSPatrick Caulfield goto accept_err; 9806ed7257bSPatrick Caulfield 9816ed7257bSPatrick Caulfield /* Get the connected socket's peer */ 9826ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 9839b2c45d4SDenys Vlasenko len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); 9849b2c45d4SDenys Vlasenko if (len < 0) { 9856ed7257bSPatrick Caulfield result = -ECONNABORTED; 9866ed7257bSPatrick Caulfield goto accept_err; 9876ed7257bSPatrick Caulfield } 9886ed7257bSPatrick Caulfield 9896ed7257bSPatrick Caulfield /* Get the new node's NODEID */ 9906ed7257bSPatrick Caulfield make_sockaddr(&peeraddr, 0, &len); 991e125fbebSAlexander Aring if (addr_to_nodeid(&peeraddr, &nodeid, &mark)) { 992feae43f8SAlexander Aring switch (peeraddr.ss_family) { 993feae43f8SAlexander Aring case AF_INET: { 994feae43f8SAlexander Aring struct sockaddr_in *sin = (struct sockaddr_in *)&peeraddr; 995feae43f8SAlexander Aring 996feae43f8SAlexander Aring log_print("connect from non cluster IPv4 node %pI4", 997feae43f8SAlexander Aring &sin->sin_addr); 998feae43f8SAlexander Aring break; 999feae43f8SAlexander Aring } 1000feae43f8SAlexander Aring #if IS_ENABLED(CONFIG_IPV6) 1001feae43f8SAlexander Aring case AF_INET6: { 1002feae43f8SAlexander Aring struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&peeraddr; 1003feae43f8SAlexander Aring 1004feae43f8SAlexander Aring log_print("connect from non cluster IPv6 node %pI6c", 1005feae43f8SAlexander Aring &sin6->sin6_addr); 1006feae43f8SAlexander Aring break; 1007feae43f8SAlexander Aring } 1008feae43f8SAlexander Aring #endif 1009feae43f8SAlexander Aring default: 1010feae43f8SAlexander Aring log_print("invalid family from non cluster node"); 1011feae43f8SAlexander Aring break; 1012feae43f8SAlexander Aring } 1013feae43f8SAlexander Aring 10146ed7257bSPatrick Caulfield sock_release(newsock); 10156ed7257bSPatrick Caulfield return -1; 10166ed7257bSPatrick Caulfield } 10176ed7257bSPatrick Caulfield 10186ed7257bSPatrick Caulfield log_print("got connection from %d", nodeid); 10196ed7257bSPatrick Caulfield 10206ed7257bSPatrick Caulfield /* Check to see if we already have a connection to this node. This 10216ed7257bSPatrick Caulfield * could happen if the two nodes initiate a connection at roughly 10226ed7257bSPatrick Caulfield * the same time and the connections cross on the wire. 10236ed7257bSPatrick Caulfield * In this case we store the incoming one in "othercon" 10246ed7257bSPatrick Caulfield */ 1025b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 10266f0b0b5dSAlexander Aring newcon = nodeid2con(nodeid, 0); 10276f0b0b5dSAlexander Aring if (WARN_ON_ONCE(!newcon)) { 1028b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 10296f0b0b5dSAlexander Aring result = -ENOENT; 10306ed7257bSPatrick Caulfield goto accept_err; 10316ed7257bSPatrick Caulfield } 1032d11ccd45SAlexander Aring 1033e125fbebSAlexander Aring sock_set_mark(newsock->sk, mark); 1034e125fbebSAlexander Aring 1035dbb751ffSAlexander Aring down_write(&newcon->sock_lock); 10366ed7257bSPatrick Caulfield if (newcon->sock) { 10376ed7257bSPatrick Caulfield struct connection *othercon = newcon->othercon; 10386ed7257bSPatrick Caulfield 10396ed7257bSPatrick Caulfield if (!othercon) { 1040a47666ebSAlexander Aring othercon = kzalloc(sizeof(*othercon), GFP_NOFS); 10416ed7257bSPatrick Caulfield if (!othercon) { 1042617e82e1SDavid Teigland log_print("failed to allocate incoming socket"); 1043dbb751ffSAlexander Aring up_write(&newcon->sock_lock); 1044b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 10456ed7257bSPatrick Caulfield result = -ENOMEM; 10466ed7257bSPatrick Caulfield goto accept_err; 10476ed7257bSPatrick Caulfield } 10484798cbbfSAlexander Aring 1049dbb751ffSAlexander Aring dlm_con_init(othercon, nodeid); 1050dbb751ffSAlexander Aring lockdep_set_subclass(&othercon->sock_lock, 1); 10516cde210aSAlexander Aring newcon->othercon = othercon; 1052dbb751ffSAlexander Aring set_bit(CF_IS_OTHERCON, &othercon->flags); 1053ba3ab3caSAlexander Aring } else { 1054ba3ab3caSAlexander Aring /* close other sock con if we have something new */ 1055dbb751ffSAlexander Aring close_connection(othercon, false); 105661d96be0SPatrick Caulfield } 1057ba3ab3caSAlexander Aring 1058dbb751ffSAlexander Aring down_write(&othercon->sock_lock); 1059988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, othercon); 1060dbb751ffSAlexander Aring 1061dbb751ffSAlexander Aring /* check if we receved something while adding */ 1062dbb751ffSAlexander Aring lock_sock(othercon->sock->sk); 1063dbb751ffSAlexander Aring lowcomms_queue_rwork(othercon); 1064dbb751ffSAlexander Aring release_sock(othercon->sock->sk); 1065dbb751ffSAlexander Aring up_write(&othercon->sock_lock); 10666ed7257bSPatrick Caulfield } 10676ed7257bSPatrick Caulfield else { 10683735b4b9SBob Peterson /* accept copies the sk after we've saved the callbacks, so we 10693735b4b9SBob Peterson don't want to save them a second time or comm errors will 10703735b4b9SBob Peterson result in calling sk_error_report recursively. */ 1071988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, newcon); 1072dbb751ffSAlexander Aring 1073dbb751ffSAlexander Aring /* check if we receved something while adding */ 1074dbb751ffSAlexander Aring lock_sock(newcon->sock->sk); 1075dbb751ffSAlexander Aring lowcomms_queue_rwork(newcon); 1076dbb751ffSAlexander Aring release_sock(newcon->sock->sk); 10776ed7257bSPatrick Caulfield } 1078dbb751ffSAlexander Aring up_write(&newcon->sock_lock); 1079b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1080b38bc9c2SAlexander Aring 1081dbb751ffSAlexander Aring return DLM_IO_SUCCESS; 10826ed7257bSPatrick Caulfield 10836ed7257bSPatrick Caulfield accept_err: 10843421fb15Stsutomu.owa@toshiba.co.jp if (newsock) 10856ed7257bSPatrick Caulfield sock_release(newsock); 10866ed7257bSPatrick Caulfield 10876ed7257bSPatrick Caulfield return result; 10886ed7257bSPatrick Caulfield } 10896ed7257bSPatrick Caulfield 10905d689871SMike Christie /* 10915d689871SMike Christie * writequeue_entry_complete - try to delete and free write queue entry 10925d689871SMike Christie * @e: write queue entry to try to delete 10935d689871SMike Christie * @completed: bytes completed 10945d689871SMike Christie * 10955d689871SMike Christie * writequeue_lock must be held. 10965d689871SMike Christie */ 10975d689871SMike Christie static void writequeue_entry_complete(struct writequeue_entry *e, int completed) 10985d689871SMike Christie { 10995d689871SMike Christie e->offset += completed; 11005d689871SMike Christie e->len -= completed; 1101706474fbSAlexander Aring /* signal that page was half way transmitted */ 1102706474fbSAlexander Aring e->dirty = true; 11035d689871SMike Christie 11048f2dc78dSAlexander Aring if (e->len == 0 && e->users == 0) 11055d689871SMike Christie free_entry(e); 11065d689871SMike Christie } 11075d689871SMike Christie 1108ee44b4bcSMarcelo Ricardo Leitner /* 1109ee44b4bcSMarcelo Ricardo Leitner * sctp_bind_addrs - bind a SCTP socket to all our addresses 1110ee44b4bcSMarcelo Ricardo Leitner */ 111113004e8aSAlexander Aring static int sctp_bind_addrs(struct socket *sock, uint16_t port) 1112ee44b4bcSMarcelo Ricardo Leitner { 1113ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage localaddr; 1114c0425a42SChristoph Hellwig struct sockaddr *addr = (struct sockaddr *)&localaddr; 1115ee44b4bcSMarcelo Ricardo Leitner int i, addr_len, result = 0; 1116ee44b4bcSMarcelo Ricardo Leitner 1117ee44b4bcSMarcelo Ricardo Leitner for (i = 0; i < dlm_local_count; i++) { 1118c51c9cd8SAlexander Aring memcpy(&localaddr, &dlm_local_addr[i], sizeof(localaddr)); 1119ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&localaddr, port, &addr_len); 1120ee44b4bcSMarcelo Ricardo Leitner 1121ee44b4bcSMarcelo Ricardo Leitner if (!i) 112213004e8aSAlexander Aring result = kernel_bind(sock, addr, addr_len); 1123ee44b4bcSMarcelo Ricardo Leitner else 112413004e8aSAlexander Aring result = sock_bind_add(sock->sk, addr, addr_len); 1125ee44b4bcSMarcelo Ricardo Leitner 1126ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 1127ee44b4bcSMarcelo Ricardo Leitner log_print("Can't bind to %d addr number %d, %d.\n", 1128ee44b4bcSMarcelo Ricardo Leitner port, i + 1, result); 1129ee44b4bcSMarcelo Ricardo Leitner break; 1130ee44b4bcSMarcelo Ricardo Leitner } 1131ee44b4bcSMarcelo Ricardo Leitner } 1132ee44b4bcSMarcelo Ricardo Leitner return result; 1133ee44b4bcSMarcelo Ricardo Leitner } 1134ee44b4bcSMarcelo Ricardo Leitner 11356ed7257bSPatrick Caulfield /* Get local addresses */ 11366ed7257bSPatrick Caulfield static void init_local(void) 11376ed7257bSPatrick Caulfield { 1138c51c9cd8SAlexander Aring struct sockaddr_storage sas; 11396ed7257bSPatrick Caulfield int i; 11406ed7257bSPatrick Caulfield 114130d3a237SPatrick Caulfield dlm_local_count = 0; 11421b189b88SDavid Teigland for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { 11436ed7257bSPatrick Caulfield if (dlm_our_addr(&sas, i)) 11446ed7257bSPatrick Caulfield break; 11456ed7257bSPatrick Caulfield 1146c51c9cd8SAlexander Aring memcpy(&dlm_local_addr[dlm_local_count++], &sas, sizeof(sas)); 11476ed7257bSPatrick Caulfield } 11486ed7257bSPatrick Caulfield } 11496ed7257bSPatrick Caulfield 1150be3b0400SAlexander Aring static struct writequeue_entry *new_writequeue_entry(struct connection *con) 11516ed7257bSPatrick Caulfield { 11526ed7257bSPatrick Caulfield struct writequeue_entry *entry; 11536ed7257bSPatrick Caulfield 11543af2326cSAlexander Aring entry = dlm_allocate_writequeue(); 11556ed7257bSPatrick Caulfield if (!entry) 11566ed7257bSPatrick Caulfield return NULL; 11576ed7257bSPatrick Caulfield 1158be3b0400SAlexander Aring entry->page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 11596ed7257bSPatrick Caulfield if (!entry->page) { 11603af2326cSAlexander Aring dlm_free_writequeue(entry); 11616ed7257bSPatrick Caulfield return NULL; 11626ed7257bSPatrick Caulfield } 11636ed7257bSPatrick Caulfield 11643af2326cSAlexander Aring entry->offset = 0; 11653af2326cSAlexander Aring entry->len = 0; 11663af2326cSAlexander Aring entry->end = 0; 11673af2326cSAlexander Aring entry->dirty = false; 11686ed7257bSPatrick Caulfield entry->con = con; 1169f0747ebfSAlexander Aring entry->users = 1; 11708f2dc78dSAlexander Aring kref_init(&entry->ref); 11716ed7257bSPatrick Caulfield return entry; 11726ed7257bSPatrick Caulfield } 11736ed7257bSPatrick Caulfield 1174f0747ebfSAlexander Aring static struct writequeue_entry *new_wq_entry(struct connection *con, int len, 1175be3b0400SAlexander Aring char **ppc, void (*cb)(void *data), 1176be3b0400SAlexander Aring void *data) 1177f0747ebfSAlexander Aring { 1178f0747ebfSAlexander Aring struct writequeue_entry *e; 1179f0747ebfSAlexander Aring 1180dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 1181f0747ebfSAlexander Aring if (!list_empty(&con->writequeue)) { 1182f0747ebfSAlexander Aring e = list_last_entry(&con->writequeue, struct writequeue_entry, list); 1183f0747ebfSAlexander Aring if (DLM_WQ_REMAIN_BYTES(e) >= len) { 11848f2dc78dSAlexander Aring kref_get(&e->ref); 11858f2dc78dSAlexander Aring 1186f0747ebfSAlexander Aring *ppc = page_address(e->page) + e->end; 11878f2dc78dSAlexander Aring if (cb) 11885c16febbSAlexander Aring cb(data); 11898f2dc78dSAlexander Aring 1190f0747ebfSAlexander Aring e->end += len; 1191f0747ebfSAlexander Aring e->users++; 1192be3b0400SAlexander Aring goto out; 1193f0747ebfSAlexander Aring } 1194f0747ebfSAlexander Aring } 1195f0747ebfSAlexander Aring 1196be3b0400SAlexander Aring e = new_writequeue_entry(con); 1197f0747ebfSAlexander Aring if (!e) 1198be3b0400SAlexander Aring goto out; 1199f0747ebfSAlexander Aring 12008f2dc78dSAlexander Aring kref_get(&e->ref); 1201f0747ebfSAlexander Aring *ppc = page_address(e->page); 1202f0747ebfSAlexander Aring e->end += len; 12038f2dc78dSAlexander Aring if (cb) 12045c16febbSAlexander Aring cb(data); 12058f2dc78dSAlexander Aring 1206f0747ebfSAlexander Aring list_add_tail(&e->list, &con->writequeue); 1207f0747ebfSAlexander Aring 1208be3b0400SAlexander Aring out: 1209dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 1210f0747ebfSAlexander Aring return e; 1211f0747ebfSAlexander Aring }; 1212f0747ebfSAlexander Aring 12132874d1a6SAlexander Aring static struct dlm_msg *dlm_lowcomms_new_msg_con(struct connection *con, int len, 12142874d1a6SAlexander Aring gfp_t allocation, char **ppc, 12155c16febbSAlexander Aring void (*cb)(void *data), 12165c16febbSAlexander Aring void *data) 12172874d1a6SAlexander Aring { 12182874d1a6SAlexander Aring struct writequeue_entry *e; 12192874d1a6SAlexander Aring struct dlm_msg *msg; 12202874d1a6SAlexander Aring 1221e4dc81edSAlexander Aring msg = dlm_allocate_msg(allocation); 12222874d1a6SAlexander Aring if (!msg) 12232874d1a6SAlexander Aring return NULL; 12242874d1a6SAlexander Aring 12252874d1a6SAlexander Aring kref_init(&msg->ref); 12262874d1a6SAlexander Aring 1227be3b0400SAlexander Aring e = new_wq_entry(con, len, ppc, cb, data); 12282874d1a6SAlexander Aring if (!e) { 1229e4dc81edSAlexander Aring dlm_free_msg(msg); 12302874d1a6SAlexander Aring return NULL; 12312874d1a6SAlexander Aring } 12322874d1a6SAlexander Aring 1233e4dc81edSAlexander Aring msg->retransmit = false; 1234e4dc81edSAlexander Aring msg->orig_msg = NULL; 12352874d1a6SAlexander Aring msg->ppc = *ppc; 12362874d1a6SAlexander Aring msg->len = len; 12372874d1a6SAlexander Aring msg->entry = e; 12382874d1a6SAlexander Aring 12392874d1a6SAlexander Aring return msg; 12402874d1a6SAlexander Aring } 12412874d1a6SAlexander Aring 1242a8449f23SAlexander Aring /* avoid false positive for nodes_srcu, unlock happens in 1243a8449f23SAlexander Aring * dlm_lowcomms_commit_msg which is a must call if success 1244a8449f23SAlexander Aring */ 1245a8449f23SAlexander Aring #ifndef __CHECKER__ 12468f2dc78dSAlexander Aring struct dlm_msg *dlm_lowcomms_new_msg(int nodeid, int len, gfp_t allocation, 12475c16febbSAlexander Aring char **ppc, void (*cb)(void *data), 12485c16febbSAlexander Aring void *data) 12496ed7257bSPatrick Caulfield { 12506ed7257bSPatrick Caulfield struct connection *con; 12518f2dc78dSAlexander Aring struct dlm_msg *msg; 1252b38bc9c2SAlexander Aring int idx; 12536ed7257bSPatrick Caulfield 1254d10a0b88SAlexander Aring if (len > DLM_MAX_SOCKET_BUFSIZE || 1255c45674fbSAlexander Aring len < sizeof(struct dlm_header)) { 1256d10a0b88SAlexander Aring BUILD_BUG_ON(PAGE_SIZE < DLM_MAX_SOCKET_BUFSIZE); 1257692f51c8SAlexander Aring log_print("failed to allocate a buffer of size %d", len); 1258dbb751ffSAlexander Aring WARN_ON_ONCE(1); 1259692f51c8SAlexander Aring return NULL; 1260692f51c8SAlexander Aring } 1261692f51c8SAlexander Aring 1262b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 12636f0b0b5dSAlexander Aring con = nodeid2con(nodeid, 0); 12646f0b0b5dSAlexander Aring if (WARN_ON_ONCE(!con)) { 1265b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 12666ed7257bSPatrick Caulfield return NULL; 1267b38bc9c2SAlexander Aring } 12686ed7257bSPatrick Caulfield 12695c16febbSAlexander Aring msg = dlm_lowcomms_new_msg_con(con, len, allocation, ppc, cb, data); 12708f2dc78dSAlexander Aring if (!msg) { 1271b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1272b38bc9c2SAlexander Aring return NULL; 1273b38bc9c2SAlexander Aring } 1274b38bc9c2SAlexander Aring 127530ea3257SAlexander Aring /* for dlm_lowcomms_commit_msg() */ 127630ea3257SAlexander Aring kref_get(&msg->ref); 12778f2dc78dSAlexander Aring /* we assume if successful commit must called */ 12788f2dc78dSAlexander Aring msg->idx = idx; 12798f2dc78dSAlexander Aring return msg; 12808f2dc78dSAlexander Aring } 1281a8449f23SAlexander Aring #endif 12828f2dc78dSAlexander Aring 12832874d1a6SAlexander Aring static void _dlm_lowcomms_commit_msg(struct dlm_msg *msg) 12846ed7257bSPatrick Caulfield { 12858f2dc78dSAlexander Aring struct writequeue_entry *e = msg->entry; 12866ed7257bSPatrick Caulfield struct connection *con = e->con; 12876ed7257bSPatrick Caulfield int users; 12886ed7257bSPatrick Caulfield 1289dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 12908f2dc78dSAlexander Aring kref_get(&msg->ref); 12918f2dc78dSAlexander Aring list_add(&msg->list, &e->msgs); 12928f2dc78dSAlexander Aring 12936ed7257bSPatrick Caulfield users = --e->users; 12946ed7257bSPatrick Caulfield if (users) 12956ed7257bSPatrick Caulfield goto out; 1296f0747ebfSAlexander Aring 1297f0747ebfSAlexander Aring e->len = DLM_WQ_LENGTH_BYTES(e); 12986ed7257bSPatrick Caulfield 1299dbb751ffSAlexander Aring lowcomms_queue_swork(con); 13006ed7257bSPatrick Caulfield 13016ed7257bSPatrick Caulfield out: 1302dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 13036ed7257bSPatrick Caulfield return; 13046ed7257bSPatrick Caulfield } 13056ed7257bSPatrick Caulfield 1306a8449f23SAlexander Aring /* avoid false positive for nodes_srcu, lock was happen in 1307a8449f23SAlexander Aring * dlm_lowcomms_new_msg 1308a8449f23SAlexander Aring */ 1309a8449f23SAlexander Aring #ifndef __CHECKER__ 13102874d1a6SAlexander Aring void dlm_lowcomms_commit_msg(struct dlm_msg *msg) 13112874d1a6SAlexander Aring { 13122874d1a6SAlexander Aring _dlm_lowcomms_commit_msg(msg); 13132874d1a6SAlexander Aring srcu_read_unlock(&connections_srcu, msg->idx); 131430ea3257SAlexander Aring /* because dlm_lowcomms_new_msg() */ 131530ea3257SAlexander Aring kref_put(&msg->ref, dlm_msg_release); 13162874d1a6SAlexander Aring } 1317a8449f23SAlexander Aring #endif 13182874d1a6SAlexander Aring 13198f2dc78dSAlexander Aring void dlm_lowcomms_put_msg(struct dlm_msg *msg) 13208f2dc78dSAlexander Aring { 13218f2dc78dSAlexander Aring kref_put(&msg->ref, dlm_msg_release); 13228f2dc78dSAlexander Aring } 13238f2dc78dSAlexander Aring 1324dbb751ffSAlexander Aring /* does not held connections_srcu, usage lowcomms_error_report only */ 13252874d1a6SAlexander Aring int dlm_lowcomms_resend_msg(struct dlm_msg *msg) 13262874d1a6SAlexander Aring { 13272874d1a6SAlexander Aring struct dlm_msg *msg_resend; 13282874d1a6SAlexander Aring char *ppc; 13292874d1a6SAlexander Aring 13302874d1a6SAlexander Aring if (msg->retransmit) 13312874d1a6SAlexander Aring return 1; 13322874d1a6SAlexander Aring 13332874d1a6SAlexander Aring msg_resend = dlm_lowcomms_new_msg_con(msg->entry->con, msg->len, 13342874d1a6SAlexander Aring GFP_ATOMIC, &ppc, NULL, NULL); 13352874d1a6SAlexander Aring if (!msg_resend) 13362874d1a6SAlexander Aring return -ENOMEM; 13372874d1a6SAlexander Aring 13382874d1a6SAlexander Aring msg->retransmit = true; 13392874d1a6SAlexander Aring kref_get(&msg->ref); 13402874d1a6SAlexander Aring msg_resend->orig_msg = msg; 13412874d1a6SAlexander Aring 13422874d1a6SAlexander Aring memcpy(ppc, msg->ppc, msg->len); 13432874d1a6SAlexander Aring _dlm_lowcomms_commit_msg(msg_resend); 13442874d1a6SAlexander Aring dlm_lowcomms_put_msg(msg_resend); 13452874d1a6SAlexander Aring 13462874d1a6SAlexander Aring return 0; 13472874d1a6SAlexander Aring } 13482874d1a6SAlexander Aring 13496ed7257bSPatrick Caulfield /* Send a message */ 1350dbb751ffSAlexander Aring static int send_to_sock(struct connection *con) 13516ed7257bSPatrick Caulfield { 13526ed7257bSPatrick Caulfield const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 13536ed7257bSPatrick Caulfield struct writequeue_entry *e; 135466d5955aSAlexander Aring int len, offset, ret; 1355194a3fb4SAlexander Aring 1356dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 135766d5955aSAlexander Aring e = con_next_wq(con); 1358dbb751ffSAlexander Aring if (!e) { 1359dbb751ffSAlexander Aring clear_bit(CF_SEND_PENDING, &con->flags); 1360dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 1361dbb751ffSAlexander Aring return DLM_IO_END; 1362dbb751ffSAlexander Aring } 13636ed7257bSPatrick Caulfield 13646ed7257bSPatrick Caulfield len = e->len; 13656ed7257bSPatrick Caulfield offset = e->offset; 1366dbb751ffSAlexander Aring WARN_ON_ONCE(len == 0 && e->users == 0); 1367dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 13686ed7257bSPatrick Caulfield 13691329e3f2SPaolo Bonzini ret = kernel_sendpage(con->sock, e->page, offset, len, 13706ed7257bSPatrick Caulfield msg_flags); 137192732376SAlexander Aring trace_dlm_send(con->nodeid, ret); 1372d66f8277SPatrick Caulfield if (ret == -EAGAIN || ret == 0) { 1373dbb751ffSAlexander Aring lock_sock(con->sock->sk); 1374dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 1375dbb751ffSAlexander Aring if (test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && 1376b36930ddSDavid Miller !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { 1377b36930ddSDavid Miller /* Notify TCP that we're limited by the 1378b36930ddSDavid Miller * application window size. 1379b36930ddSDavid Miller */ 1380dbb751ffSAlexander Aring set_bit(SOCK_NOSPACE, &con->sock->sk->sk_socket->flags); 1381b36930ddSDavid Miller con->sock->sk->sk_write_pending++; 1382f92c8dd7SBob Peterson 1383dbb751ffSAlexander Aring clear_bit(CF_SEND_PENDING, &con->flags); 1384dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 1385dbb751ffSAlexander Aring release_sock(con->sock->sk); 1386dbb751ffSAlexander Aring 1387dbb751ffSAlexander Aring /* wait for write_space() event */ 1388dbb751ffSAlexander Aring return DLM_IO_END; 1389dbb751ffSAlexander Aring } 1390dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 1391dbb751ffSAlexander Aring release_sock(con->sock->sk); 1392dbb751ffSAlexander Aring 1393dbb751ffSAlexander Aring return DLM_IO_RESCHED; 1394dbb751ffSAlexander Aring } else if (ret < 0) { 1395dbb751ffSAlexander Aring return ret; 1396dbb751ffSAlexander Aring } 1397dbb751ffSAlexander Aring 1398dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 13995d689871SMike Christie writequeue_entry_complete(e, ret); 1400dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 1401194a3fb4SAlexander Aring 1402dbb751ffSAlexander Aring return DLM_IO_SUCCESS; 14036ed7257bSPatrick Caulfield } 14046ed7257bSPatrick Caulfield 14056ed7257bSPatrick Caulfield static void clean_one_writequeue(struct connection *con) 14066ed7257bSPatrick Caulfield { 14075e9ccc37SChristine Caulfield struct writequeue_entry *e, *safe; 14086ed7257bSPatrick Caulfield 1409dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 14105e9ccc37SChristine Caulfield list_for_each_entry_safe(e, safe, &con->writequeue, list) { 14116ed7257bSPatrick Caulfield free_entry(e); 14126ed7257bSPatrick Caulfield } 1413dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 14146ed7257bSPatrick Caulfield } 14156ed7257bSPatrick Caulfield 14166f0b0b5dSAlexander Aring static void connection_release(struct rcu_head *rcu) 14176f0b0b5dSAlexander Aring { 14186f0b0b5dSAlexander Aring struct connection *con = container_of(rcu, struct connection, rcu); 14196f0b0b5dSAlexander Aring 1420dbb751ffSAlexander Aring WARN_ON_ONCE(!list_empty(&con->writequeue)); 1421dbb751ffSAlexander Aring WARN_ON_ONCE(con->sock); 14226f0b0b5dSAlexander Aring kfree(con); 14236f0b0b5dSAlexander Aring } 14246f0b0b5dSAlexander Aring 14256ed7257bSPatrick Caulfield /* Called from recovery when it knows that a node has 14266ed7257bSPatrick Caulfield left the cluster */ 14276ed7257bSPatrick Caulfield int dlm_lowcomms_close(int nodeid) 14286ed7257bSPatrick Caulfield { 14296ed7257bSPatrick Caulfield struct connection *con; 1430b38bc9c2SAlexander Aring int idx; 14316ed7257bSPatrick Caulfield 14326ed7257bSPatrick Caulfield log_print("closing connection to node %d", nodeid); 14336f0b0b5dSAlexander Aring 1434b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 14356ed7257bSPatrick Caulfield con = nodeid2con(nodeid, 0); 14366f0b0b5dSAlexander Aring if (WARN_ON_ONCE(!con)) { 14376f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 14386f0b0b5dSAlexander Aring return -ENOENT; 14396f0b0b5dSAlexander Aring } 14406f0b0b5dSAlexander Aring 1441dbb751ffSAlexander Aring stop_connection_io(con); 1442dbb751ffSAlexander Aring log_print("io handling for node: %d stopped", nodeid); 1443dbb751ffSAlexander Aring close_connection(con, true); 1444dbb751ffSAlexander Aring 14456f0b0b5dSAlexander Aring spin_lock(&connections_lock); 14466f0b0b5dSAlexander Aring hlist_del_rcu(&con->list); 14476f0b0b5dSAlexander Aring spin_unlock(&connections_lock); 14486f0b0b5dSAlexander Aring 14496ed7257bSPatrick Caulfield clean_one_writequeue(con); 14506f0b0b5dSAlexander Aring call_srcu(&connections_srcu, &con->rcu, connection_release); 14516f0b0b5dSAlexander Aring if (con->othercon) { 145253a5edaaSAlexander Aring clean_one_writequeue(con->othercon); 14536f0b0b5dSAlexander Aring if (con->othercon) 14546f0b0b5dSAlexander Aring call_srcu(&connections_srcu, &con->othercon->rcu, connection_release); 14556ed7257bSPatrick Caulfield } 1456b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 145736b71a8bSDavid Teigland 1458dbb751ffSAlexander Aring /* for debugging we print when we are done to compare with other 1459dbb751ffSAlexander Aring * messages in between. This function need to be correctly synchronized 1460dbb751ffSAlexander Aring * with io handling 1461dbb751ffSAlexander Aring */ 1462dbb751ffSAlexander Aring log_print("closing connection to node %d done", nodeid); 1463dbb751ffSAlexander Aring 14646ed7257bSPatrick Caulfield return 0; 14656ed7257bSPatrick Caulfield } 14666ed7257bSPatrick Caulfield 1467dbb751ffSAlexander Aring /* Receive worker function */ 14686ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work) 14696ed7257bSPatrick Caulfield { 14706ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, rwork); 1471dbb751ffSAlexander Aring int ret, buflen; 14726ed7257bSPatrick Caulfield 1473dbb751ffSAlexander Aring down_read(&con->sock_lock); 1474dbb751ffSAlexander Aring if (!con->sock) { 1475dbb751ffSAlexander Aring up_read(&con->sock_lock); 1476dbb751ffSAlexander Aring return; 1477dbb751ffSAlexander Aring } 1478dbb751ffSAlexander Aring 1479dbb751ffSAlexander Aring buflen = READ_ONCE(dlm_config.ci_buffer_size); 1480dbb751ffSAlexander Aring do { 1481dbb751ffSAlexander Aring ret = receive_from_sock(con, buflen); 1482dbb751ffSAlexander Aring } while (ret == DLM_IO_SUCCESS); 1483dbb751ffSAlexander Aring up_read(&con->sock_lock); 1484dbb751ffSAlexander Aring 1485dbb751ffSAlexander Aring switch (ret) { 1486dbb751ffSAlexander Aring case DLM_IO_END: 1487dbb751ffSAlexander Aring /* CF_RECV_PENDING cleared */ 1488dbb751ffSAlexander Aring break; 1489dbb751ffSAlexander Aring case DLM_IO_EOF: 1490dbb751ffSAlexander Aring close_connection(con, false); 1491dbb751ffSAlexander Aring /* CF_RECV_PENDING cleared */ 1492dbb751ffSAlexander Aring break; 1493dbb751ffSAlexander Aring case DLM_IO_RESCHED: 1494dbb751ffSAlexander Aring cond_resched(); 1495dbb751ffSAlexander Aring queue_work(io_workqueue, &con->rwork); 1496dbb751ffSAlexander Aring /* CF_RECV_PENDING not cleared */ 1497dbb751ffSAlexander Aring break; 1498dbb751ffSAlexander Aring default: 1499dbb751ffSAlexander Aring if (ret < 0) { 1500dbb751ffSAlexander Aring if (test_bit(CF_IS_OTHERCON, &con->flags)) { 1501dbb751ffSAlexander Aring close_connection(con, false); 1502dbb751ffSAlexander Aring } else { 1503dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 1504dbb751ffSAlexander Aring lowcomms_queue_swork(con); 1505dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 1506dbb751ffSAlexander Aring } 1507dbb751ffSAlexander Aring 1508dbb751ffSAlexander Aring /* CF_RECV_PENDING cleared for othercon 1509dbb751ffSAlexander Aring * we trigger send queue if not already done 1510dbb751ffSAlexander Aring * and process_send_sockets will handle it 1511dbb751ffSAlexander Aring */ 1512dbb751ffSAlexander Aring break; 1513dbb751ffSAlexander Aring } 1514dbb751ffSAlexander Aring 1515dbb751ffSAlexander Aring WARN_ON_ONCE(1); 1516dbb751ffSAlexander Aring break; 1517dbb751ffSAlexander Aring } 15186ed7257bSPatrick Caulfield } 15196ed7257bSPatrick Caulfield 1520d11ccd45SAlexander Aring static void process_listen_recv_socket(struct work_struct *work) 1521d11ccd45SAlexander Aring { 1522f0f4bb43SAlexander Aring int ret; 1523f0f4bb43SAlexander Aring 1524dbb751ffSAlexander Aring if (WARN_ON_ONCE(!listen_con.sock)) 1525dbb751ffSAlexander Aring return; 1526dbb751ffSAlexander Aring 1527f0f4bb43SAlexander Aring do { 1528dbb751ffSAlexander Aring ret = accept_from_sock(); 1529dbb751ffSAlexander Aring } while (ret == DLM_IO_SUCCESS); 1530dbb751ffSAlexander Aring 1531dbb751ffSAlexander Aring if (ret < 0) 1532dbb751ffSAlexander Aring log_print("critical error accepting connection: %d", ret); 1533d11ccd45SAlexander Aring } 1534d11ccd45SAlexander Aring 1535dbb751ffSAlexander Aring static int dlm_connect(struct connection *con) 15368728a455SAlexander Aring { 15378728a455SAlexander Aring struct sockaddr_storage addr; 15388728a455SAlexander Aring int result, addr_len; 15398728a455SAlexander Aring struct socket *sock; 15408728a455SAlexander Aring unsigned int mark; 15418728a455SAlexander Aring 15428728a455SAlexander Aring memset(&addr, 0, sizeof(addr)); 15438728a455SAlexander Aring result = nodeid_to_addr(con->nodeid, &addr, NULL, 15448728a455SAlexander Aring dlm_proto_ops->try_new_addr, &mark); 15458728a455SAlexander Aring if (result < 0) { 15468728a455SAlexander Aring log_print("no address for nodeid %d", con->nodeid); 1547dbb751ffSAlexander Aring return result; 15488728a455SAlexander Aring } 15498728a455SAlexander Aring 15508728a455SAlexander Aring /* Create a socket to communicate with */ 1551c51c9cd8SAlexander Aring result = sock_create_kern(&init_net, dlm_local_addr[0].ss_family, 15528728a455SAlexander Aring SOCK_STREAM, dlm_proto_ops->proto, &sock); 15538728a455SAlexander Aring if (result < 0) 1554dbb751ffSAlexander Aring return result; 15558728a455SAlexander Aring 15568728a455SAlexander Aring sock_set_mark(sock->sk, mark); 15578728a455SAlexander Aring dlm_proto_ops->sockopts(sock); 15588728a455SAlexander Aring 15598728a455SAlexander Aring result = dlm_proto_ops->bind(sock); 1560dbb751ffSAlexander Aring if (result < 0) { 1561dbb751ffSAlexander Aring sock_release(sock); 1562dbb751ffSAlexander Aring return result; 1563dbb751ffSAlexander Aring } 1564dbb751ffSAlexander Aring 1565dbb751ffSAlexander Aring add_sock(sock, con); 15668728a455SAlexander Aring 15678728a455SAlexander Aring log_print_ratelimited("connecting to %d", con->nodeid); 15688728a455SAlexander Aring make_sockaddr(&addr, dlm_config.ci_tcp_port, &addr_len); 15698728a455SAlexander Aring result = dlm_proto_ops->connect(con, sock, (struct sockaddr *)&addr, 15708728a455SAlexander Aring addr_len); 1571dbb751ffSAlexander Aring switch (result) { 1572dbb751ffSAlexander Aring case -EINPROGRESS: 1573dbb751ffSAlexander Aring /* not an error */ 1574dbb751ffSAlexander Aring fallthrough; 1575dbb751ffSAlexander Aring case 0: 1576dbb751ffSAlexander Aring break; 1577dbb751ffSAlexander Aring default: 15788728a455SAlexander Aring if (result < 0) 15798728a455SAlexander Aring dlm_close_sock(&con->sock); 15808728a455SAlexander Aring 1581dbb751ffSAlexander Aring break; 15828728a455SAlexander Aring } 15838728a455SAlexander Aring 1584dbb751ffSAlexander Aring return result; 1585dbb751ffSAlexander Aring } 1586dbb751ffSAlexander Aring 1587dbb751ffSAlexander Aring /* Send worker function */ 15886ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work) 15896ed7257bSPatrick Caulfield { 15906ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, swork); 1591dbb751ffSAlexander Aring int ret; 15926ed7257bSPatrick Caulfield 1593dbb751ffSAlexander Aring WARN_ON_ONCE(test_bit(CF_IS_OTHERCON, &con->flags)); 15947443bc96SAlexander Aring 1595dbb751ffSAlexander Aring down_read(&con->sock_lock); 1596dbb751ffSAlexander Aring if (!con->sock) { 1597dbb751ffSAlexander Aring up_read(&con->sock_lock); 1598dbb751ffSAlexander Aring down_write(&con->sock_lock); 1599dbb751ffSAlexander Aring if (!con->sock) { 1600dbb751ffSAlexander Aring ret = dlm_connect(con); 1601dbb751ffSAlexander Aring switch (ret) { 1602dbb751ffSAlexander Aring case 0: 1603dbb751ffSAlexander Aring break; 1604dbb751ffSAlexander Aring case -EINPROGRESS: 1605dbb751ffSAlexander Aring /* avoid spamming resched on connection 1606dbb751ffSAlexander Aring * we might can switch to a state_change 1607dbb751ffSAlexander Aring * event based mechanism if established 1608dbb751ffSAlexander Aring */ 1609dbb751ffSAlexander Aring msleep(100); 1610dbb751ffSAlexander Aring break; 1611dbb751ffSAlexander Aring default: 1612dbb751ffSAlexander Aring /* CF_SEND_PENDING not cleared */ 1613dbb751ffSAlexander Aring up_write(&con->sock_lock); 1614dbb751ffSAlexander Aring log_print("connect to node %d try %d error %d", 1615dbb751ffSAlexander Aring con->nodeid, con->retries++, ret); 1616ba868d9dSAlexander Aring msleep(1000); 1617dbb751ffSAlexander Aring /* For now we try forever to reconnect. In 1618dbb751ffSAlexander Aring * future we should send a event to cluster 1619dbb751ffSAlexander Aring * manager to fence itself after certain amount 1620dbb751ffSAlexander Aring * of retries. 1621dbb751ffSAlexander Aring */ 1622dbb751ffSAlexander Aring queue_work(io_workqueue, &con->swork); 1623dbb751ffSAlexander Aring return; 1624dbb751ffSAlexander Aring } 1625dbb751ffSAlexander Aring } 1626dbb751ffSAlexander Aring downgrade_write(&con->sock_lock); 1627ba868d9dSAlexander Aring } 16288728a455SAlexander Aring 1629dbb751ffSAlexander Aring do { 1630dbb751ffSAlexander Aring ret = send_to_sock(con); 1631dbb751ffSAlexander Aring } while (ret == DLM_IO_SUCCESS); 1632dbb751ffSAlexander Aring up_read(&con->sock_lock); 1633dbb751ffSAlexander Aring 1634dbb751ffSAlexander Aring switch (ret) { 1635dbb751ffSAlexander Aring case DLM_IO_END: 1636dbb751ffSAlexander Aring /* CF_SEND_PENDING cleared */ 1637dbb751ffSAlexander Aring break; 1638dbb751ffSAlexander Aring case DLM_IO_RESCHED: 1639dbb751ffSAlexander Aring /* CF_SEND_PENDING not cleared */ 1640dbb751ffSAlexander Aring cond_resched(); 1641dbb751ffSAlexander Aring queue_work(io_workqueue, &con->swork); 1642dbb751ffSAlexander Aring break; 1643dbb751ffSAlexander Aring default: 1644dbb751ffSAlexander Aring if (ret < 0) { 1645dbb751ffSAlexander Aring close_connection(con, false); 1646dbb751ffSAlexander Aring 1647dbb751ffSAlexander Aring /* CF_SEND_PENDING cleared */ 1648dbb751ffSAlexander Aring spin_lock_bh(&con->writequeue_lock); 1649dbb751ffSAlexander Aring lowcomms_queue_swork(con); 1650dbb751ffSAlexander Aring spin_unlock_bh(&con->writequeue_lock); 1651dbb751ffSAlexander Aring break; 1652dbb751ffSAlexander Aring } 1653dbb751ffSAlexander Aring 1654dbb751ffSAlexander Aring WARN_ON_ONCE(1); 1655dbb751ffSAlexander Aring break; 1656dbb751ffSAlexander Aring } 16576ed7257bSPatrick Caulfield } 16586ed7257bSPatrick Caulfield 16596ed7257bSPatrick Caulfield static void work_stop(void) 16606ed7257bSPatrick Caulfield { 1661dbb751ffSAlexander Aring if (io_workqueue) { 1662dbb751ffSAlexander Aring destroy_workqueue(io_workqueue); 1663dbb751ffSAlexander Aring io_workqueue = NULL; 1664fcef0e6cSAlexander Aring } 1665fcef0e6cSAlexander Aring 1666dbb751ffSAlexander Aring if (process_workqueue) { 1667dbb751ffSAlexander Aring destroy_workqueue(process_workqueue); 1668dbb751ffSAlexander Aring process_workqueue = NULL; 1669fcef0e6cSAlexander Aring } 16706ed7257bSPatrick Caulfield } 16716ed7257bSPatrick Caulfield 16726ed7257bSPatrick Caulfield static int work_start(void) 16736ed7257bSPatrick Caulfield { 1674dbb751ffSAlexander Aring io_workqueue = alloc_workqueue("dlm_io", WQ_HIGHPRI | WQ_MEM_RECLAIM, 1675dbb751ffSAlexander Aring 0); 1676dbb751ffSAlexander Aring if (!io_workqueue) { 1677dbb751ffSAlexander Aring log_print("can't start dlm_io"); 1678b9d41052SNamhyung Kim return -ENOMEM; 16796ed7257bSPatrick Caulfield } 16806ed7257bSPatrick Caulfield 1681dbb751ffSAlexander Aring /* ordered dlm message process queue, 1682dbb751ffSAlexander Aring * should be converted to a tasklet 1683dbb751ffSAlexander Aring */ 1684dbb751ffSAlexander Aring process_workqueue = alloc_ordered_workqueue("dlm_process", 1685dbb751ffSAlexander Aring WQ_HIGHPRI | WQ_MEM_RECLAIM); 1686dbb751ffSAlexander Aring if (!process_workqueue) { 1687dbb751ffSAlexander Aring log_print("can't start dlm_process"); 1688dbb751ffSAlexander Aring destroy_workqueue(io_workqueue); 1689dbb751ffSAlexander Aring io_workqueue = NULL; 1690b9d41052SNamhyung Kim return -ENOMEM; 16916ed7257bSPatrick Caulfield } 16926ed7257bSPatrick Caulfield 16936ed7257bSPatrick Caulfield return 0; 16946ed7257bSPatrick Caulfield } 16956ed7257bSPatrick Caulfield 16969d232469SAlexander Aring void dlm_lowcomms_shutdown(void) 16979d232469SAlexander Aring { 1698c3d88dfdSAlexander Aring /* stop lowcomms_listen_data_ready calls */ 1699c3d88dfdSAlexander Aring lock_sock(listen_con.sock->sk); 1700c3d88dfdSAlexander Aring listen_con.sock->sk->sk_data_ready = listen_sock.sk_data_ready; 1701c3d88dfdSAlexander Aring release_sock(listen_con.sock->sk); 17029d232469SAlexander Aring 1703c3d88dfdSAlexander Aring cancel_work_sync(&listen_con.rwork); 17049d232469SAlexander Aring dlm_close_sock(&listen_con.sock); 1705dbb751ffSAlexander Aring 1706dbb751ffSAlexander Aring flush_workqueue(process_workqueue); 17074f567acbSAlexander Aring } 17084f567acbSAlexander Aring 17094f567acbSAlexander Aring void dlm_lowcomms_shutdown_node(int nodeid, bool force) 17104f567acbSAlexander Aring { 17114f567acbSAlexander Aring struct connection *con; 17124f567acbSAlexander Aring int idx; 17139d232469SAlexander Aring 1714b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 17154f567acbSAlexander Aring con = nodeid2con(nodeid, 0); 17164f567acbSAlexander Aring if (WARN_ON_ONCE(!con)) { 17174f567acbSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 17184f567acbSAlexander Aring return; 17194f567acbSAlexander Aring } 17204f567acbSAlexander Aring 1721c3d88dfdSAlexander Aring flush_work(&con->swork); 1722dbb751ffSAlexander Aring stop_connection_io(con); 17234f567acbSAlexander Aring WARN_ON_ONCE(!force && !list_empty(&con->writequeue)); 1724dbb751ffSAlexander Aring close_connection(con, true); 17254f567acbSAlexander Aring clean_one_writequeue(con); 17264f567acbSAlexander Aring if (con->othercon) 17274f567acbSAlexander Aring clean_one_writequeue(con->othercon); 1728dbb751ffSAlexander Aring allow_connection_io(con); 1729b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 17309d232469SAlexander Aring } 17319d232469SAlexander Aring 17325e9ccc37SChristine Caulfield void dlm_lowcomms_stop(void) 17335e9ccc37SChristine Caulfield { 17346ed7257bSPatrick Caulfield work_stop(); 1735a66c008cSAlexander Aring dlm_proto_ops = NULL; 17366ed7257bSPatrick Caulfield } 17376ed7257bSPatrick Caulfield 17382dc6b115SAlexander Aring static int dlm_listen_for_all(void) 17392dc6b115SAlexander Aring { 17402dc6b115SAlexander Aring struct socket *sock; 17412dc6b115SAlexander Aring int result; 17422dc6b115SAlexander Aring 17432dc6b115SAlexander Aring log_print("Using %s for communications", 17442dc6b115SAlexander Aring dlm_proto_ops->name); 17452dc6b115SAlexander Aring 17462dc6b115SAlexander Aring result = dlm_proto_ops->listen_validate(); 17472dc6b115SAlexander Aring if (result < 0) 17482dc6b115SAlexander Aring return result; 17492dc6b115SAlexander Aring 1750c51c9cd8SAlexander Aring result = sock_create_kern(&init_net, dlm_local_addr[0].ss_family, 17512dc6b115SAlexander Aring SOCK_STREAM, dlm_proto_ops->proto, &sock); 17522dc6b115SAlexander Aring if (result < 0) { 1753fe933675SAlexander Aring log_print("Can't create comms socket: %d", result); 17541f4f1084SDan Carpenter return result; 17552dc6b115SAlexander Aring } 17562dc6b115SAlexander Aring 17572dc6b115SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 17582dc6b115SAlexander Aring dlm_proto_ops->listen_sockopts(sock); 17592dc6b115SAlexander Aring 17602dc6b115SAlexander Aring result = dlm_proto_ops->listen_bind(sock); 17612dc6b115SAlexander Aring if (result < 0) 17622dc6b115SAlexander Aring goto out; 17632dc6b115SAlexander Aring 1764c3d88dfdSAlexander Aring lock_sock(sock->sk); 1765c3d88dfdSAlexander Aring listen_sock.sk_data_ready = sock->sk->sk_data_ready; 1766c3d88dfdSAlexander Aring listen_sock.sk_write_space = sock->sk->sk_write_space; 1767c3d88dfdSAlexander Aring listen_sock.sk_error_report = sock->sk->sk_error_report; 1768c3d88dfdSAlexander Aring listen_sock.sk_state_change = sock->sk->sk_state_change; 1769c3d88dfdSAlexander Aring 1770c3d88dfdSAlexander Aring listen_con.sock = sock; 1771c3d88dfdSAlexander Aring 1772c3d88dfdSAlexander Aring sock->sk->sk_allocation = GFP_NOFS; 1773*98123866SBenjamin Coddington sock->sk->sk_use_task_frag = false; 1774c3d88dfdSAlexander Aring sock->sk->sk_data_ready = lowcomms_listen_data_ready; 1775c3d88dfdSAlexander Aring release_sock(sock->sk); 17762dc6b115SAlexander Aring 17772dc6b115SAlexander Aring result = sock->ops->listen(sock, 5); 17782dc6b115SAlexander Aring if (result < 0) { 17792dc6b115SAlexander Aring dlm_close_sock(&listen_con.sock); 178008ae0547SAlexander Aring return result; 17812dc6b115SAlexander Aring } 17822dc6b115SAlexander Aring 17832dc6b115SAlexander Aring return 0; 17842dc6b115SAlexander Aring 17852dc6b115SAlexander Aring out: 17862dc6b115SAlexander Aring sock_release(sock); 17872dc6b115SAlexander Aring return result; 17882dc6b115SAlexander Aring } 17892dc6b115SAlexander Aring 17908728a455SAlexander Aring static int dlm_tcp_bind(struct socket *sock) 17918728a455SAlexander Aring { 17928728a455SAlexander Aring struct sockaddr_storage src_addr; 17938728a455SAlexander Aring int result, addr_len; 17948728a455SAlexander Aring 17958728a455SAlexander Aring /* Bind to our cluster-known address connecting to avoid 17968728a455SAlexander Aring * routing problems. 17978728a455SAlexander Aring */ 1798c51c9cd8SAlexander Aring memcpy(&src_addr, &dlm_local_addr[0], sizeof(src_addr)); 17998728a455SAlexander Aring make_sockaddr(&src_addr, 0, &addr_len); 18008728a455SAlexander Aring 18018728a455SAlexander Aring result = sock->ops->bind(sock, (struct sockaddr *)&src_addr, 18028728a455SAlexander Aring addr_len); 18038728a455SAlexander Aring if (result < 0) { 18048728a455SAlexander Aring /* This *may* not indicate a critical error */ 18058728a455SAlexander Aring log_print("could not bind for connect: %d", result); 18068728a455SAlexander Aring } 18078728a455SAlexander Aring 18088728a455SAlexander Aring return 0; 18098728a455SAlexander Aring } 18108728a455SAlexander Aring 18118728a455SAlexander Aring static int dlm_tcp_connect(struct connection *con, struct socket *sock, 18128728a455SAlexander Aring struct sockaddr *addr, int addr_len) 18138728a455SAlexander Aring { 1814dbb751ffSAlexander Aring return sock->ops->connect(sock, addr, addr_len, O_NONBLOCK); 18158728a455SAlexander Aring } 18168728a455SAlexander Aring 18172dc6b115SAlexander Aring static int dlm_tcp_listen_validate(void) 18182dc6b115SAlexander Aring { 18192dc6b115SAlexander Aring /* We don't support multi-homed hosts */ 18202dc6b115SAlexander Aring if (dlm_local_count > 1) { 18212dc6b115SAlexander Aring log_print("TCP protocol can't handle multi-homed hosts, try SCTP"); 18222dc6b115SAlexander Aring return -EINVAL; 18232dc6b115SAlexander Aring } 18242dc6b115SAlexander Aring 18252dc6b115SAlexander Aring return 0; 18262dc6b115SAlexander Aring } 18272dc6b115SAlexander Aring 18282dc6b115SAlexander Aring static void dlm_tcp_sockopts(struct socket *sock) 18292dc6b115SAlexander Aring { 18302dc6b115SAlexander Aring /* Turn off Nagle's algorithm */ 18312dc6b115SAlexander Aring tcp_sock_set_nodelay(sock->sk); 18322dc6b115SAlexander Aring } 18332dc6b115SAlexander Aring 18342dc6b115SAlexander Aring static void dlm_tcp_listen_sockopts(struct socket *sock) 18352dc6b115SAlexander Aring { 18362dc6b115SAlexander Aring dlm_tcp_sockopts(sock); 18372dc6b115SAlexander Aring sock_set_reuseaddr(sock->sk); 18382dc6b115SAlexander Aring } 18392dc6b115SAlexander Aring 18402dc6b115SAlexander Aring static int dlm_tcp_listen_bind(struct socket *sock) 18412dc6b115SAlexander Aring { 18422dc6b115SAlexander Aring int addr_len; 18432dc6b115SAlexander Aring 18442dc6b115SAlexander Aring /* Bind to our port */ 1845c51c9cd8SAlexander Aring make_sockaddr(&dlm_local_addr[0], dlm_config.ci_tcp_port, &addr_len); 1846c51c9cd8SAlexander Aring return sock->ops->bind(sock, (struct sockaddr *)&dlm_local_addr[0], 18472dc6b115SAlexander Aring addr_len); 18482dc6b115SAlexander Aring } 18492dc6b115SAlexander Aring 1850a66c008cSAlexander Aring static const struct dlm_proto_ops dlm_tcp_ops = { 18512dc6b115SAlexander Aring .name = "TCP", 18522dc6b115SAlexander Aring .proto = IPPROTO_TCP, 18538728a455SAlexander Aring .connect = dlm_tcp_connect, 18548728a455SAlexander Aring .sockopts = dlm_tcp_sockopts, 18558728a455SAlexander Aring .bind = dlm_tcp_bind, 18562dc6b115SAlexander Aring .listen_validate = dlm_tcp_listen_validate, 18572dc6b115SAlexander Aring .listen_sockopts = dlm_tcp_listen_sockopts, 18582dc6b115SAlexander Aring .listen_bind = dlm_tcp_listen_bind, 1859a66c008cSAlexander Aring }; 1860a66c008cSAlexander Aring 18618728a455SAlexander Aring static int dlm_sctp_bind(struct socket *sock) 18628728a455SAlexander Aring { 18638728a455SAlexander Aring return sctp_bind_addrs(sock, 0); 18648728a455SAlexander Aring } 18658728a455SAlexander Aring 18668728a455SAlexander Aring static int dlm_sctp_connect(struct connection *con, struct socket *sock, 18678728a455SAlexander Aring struct sockaddr *addr, int addr_len) 18688728a455SAlexander Aring { 18698728a455SAlexander Aring int ret; 18708728a455SAlexander Aring 18718728a455SAlexander Aring /* 18728728a455SAlexander Aring * Make sock->ops->connect() function return in specified time, 18738728a455SAlexander Aring * since O_NONBLOCK argument in connect() function does not work here, 18748728a455SAlexander Aring * then, we should restore the default value of this attribute. 18758728a455SAlexander Aring */ 18768728a455SAlexander Aring sock_set_sndtimeo(sock->sk, 5); 18778728a455SAlexander Aring ret = sock->ops->connect(sock, addr, addr_len, 0); 18788728a455SAlexander Aring sock_set_sndtimeo(sock->sk, 0); 18798728a455SAlexander Aring return ret; 18808728a455SAlexander Aring } 18818728a455SAlexander Aring 188290d21fc0SAlexander Aring static int dlm_sctp_listen_validate(void) 188390d21fc0SAlexander Aring { 188490d21fc0SAlexander Aring if (!IS_ENABLED(CONFIG_IP_SCTP)) { 188590d21fc0SAlexander Aring log_print("SCTP is not enabled by this kernel"); 188690d21fc0SAlexander Aring return -EOPNOTSUPP; 188790d21fc0SAlexander Aring } 188890d21fc0SAlexander Aring 188990d21fc0SAlexander Aring request_module("sctp"); 189090d21fc0SAlexander Aring return 0; 189190d21fc0SAlexander Aring } 189290d21fc0SAlexander Aring 18932dc6b115SAlexander Aring static int dlm_sctp_bind_listen(struct socket *sock) 18942dc6b115SAlexander Aring { 18952dc6b115SAlexander Aring return sctp_bind_addrs(sock, dlm_config.ci_tcp_port); 18962dc6b115SAlexander Aring } 18972dc6b115SAlexander Aring 18982dc6b115SAlexander Aring static void dlm_sctp_sockopts(struct socket *sock) 18992dc6b115SAlexander Aring { 19002dc6b115SAlexander Aring /* Turn off Nagle's algorithm */ 19012dc6b115SAlexander Aring sctp_sock_set_nodelay(sock->sk); 19022dc6b115SAlexander Aring sock_set_rcvbuf(sock->sk, NEEDED_RMEM); 19032dc6b115SAlexander Aring } 19042dc6b115SAlexander Aring 1905a66c008cSAlexander Aring static const struct dlm_proto_ops dlm_sctp_ops = { 19062dc6b115SAlexander Aring .name = "SCTP", 19072dc6b115SAlexander Aring .proto = IPPROTO_SCTP, 19088728a455SAlexander Aring .try_new_addr = true, 19098728a455SAlexander Aring .connect = dlm_sctp_connect, 19108728a455SAlexander Aring .sockopts = dlm_sctp_sockopts, 19118728a455SAlexander Aring .bind = dlm_sctp_bind, 191290d21fc0SAlexander Aring .listen_validate = dlm_sctp_listen_validate, 19132dc6b115SAlexander Aring .listen_sockopts = dlm_sctp_sockopts, 19142dc6b115SAlexander Aring .listen_bind = dlm_sctp_bind_listen, 1915a66c008cSAlexander Aring }; 1916a66c008cSAlexander Aring 19176ed7257bSPatrick Caulfield int dlm_lowcomms_start(void) 19186ed7257bSPatrick Caulfield { 19191351975aSAlexander Aring int error; 19206ed7257bSPatrick Caulfield 19216ed7257bSPatrick Caulfield init_local(); 19226ed7257bSPatrick Caulfield if (!dlm_local_count) { 1923617e82e1SDavid Teigland error = -ENOTCONN; 19246ed7257bSPatrick Caulfield log_print("no local IP address has been set"); 1925513ef596SDavid Teigland goto fail; 19266ed7257bSPatrick Caulfield } 19276ed7257bSPatrick Caulfield 1928513ef596SDavid Teigland error = work_start(); 1929513ef596SDavid Teigland if (error) 1930c51c9cd8SAlexander Aring goto fail; 1931513ef596SDavid Teigland 19326ed7257bSPatrick Caulfield /* Start listening */ 1933ac7d5d03SAlexander Aring switch (dlm_config.ci_protocol) { 1934ac7d5d03SAlexander Aring case DLM_PROTO_TCP: 1935a66c008cSAlexander Aring dlm_proto_ops = &dlm_tcp_ops; 1936ac7d5d03SAlexander Aring break; 1937ac7d5d03SAlexander Aring case DLM_PROTO_SCTP: 1938a66c008cSAlexander Aring dlm_proto_ops = &dlm_sctp_ops; 1939ac7d5d03SAlexander Aring break; 1940ac7d5d03SAlexander Aring default: 1941ac7d5d03SAlexander Aring log_print("Invalid protocol identifier %d set", 1942ac7d5d03SAlexander Aring dlm_config.ci_protocol); 1943ac7d5d03SAlexander Aring error = -EINVAL; 19442dc6b115SAlexander Aring goto fail_proto_ops; 1945ac7d5d03SAlexander Aring } 19462dc6b115SAlexander Aring 19472dc6b115SAlexander Aring error = dlm_listen_for_all(); 19486ed7257bSPatrick Caulfield if (error) 19492dc6b115SAlexander Aring goto fail_listen; 19506ed7257bSPatrick Caulfield 19516ed7257bSPatrick Caulfield return 0; 19526ed7257bSPatrick Caulfield 19532dc6b115SAlexander Aring fail_listen: 19542dc6b115SAlexander Aring dlm_proto_ops = NULL; 19552dc6b115SAlexander Aring fail_proto_ops: 1956fcef0e6cSAlexander Aring work_stop(); 1957513ef596SDavid Teigland fail: 19586ed7257bSPatrick Caulfield return error; 19596ed7257bSPatrick Caulfield } 196036b71a8bSDavid Teigland 19618b0188b0SAlexander Aring void dlm_lowcomms_init(void) 19628b0188b0SAlexander Aring { 19638b0188b0SAlexander Aring int i; 19648b0188b0SAlexander Aring 19658b0188b0SAlexander Aring for (i = 0; i < CONN_HASH_SIZE; i++) 19668b0188b0SAlexander Aring INIT_HLIST_HEAD(&connection_hash[i]); 19678b0188b0SAlexander Aring 19688b0188b0SAlexander Aring INIT_WORK(&listen_con.rwork, process_listen_recv_socket); 19698b0188b0SAlexander Aring } 19708b0188b0SAlexander Aring 197136b71a8bSDavid Teigland void dlm_lowcomms_exit(void) 197236b71a8bSDavid Teigland { 19736f0b0b5dSAlexander Aring struct connection *con; 19746f0b0b5dSAlexander Aring int i, idx; 197536b71a8bSDavid Teigland 19766f0b0b5dSAlexander Aring idx = srcu_read_lock(&connections_srcu); 19776f0b0b5dSAlexander Aring for (i = 0; i < CONN_HASH_SIZE; i++) { 19786f0b0b5dSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], list) { 19796f0b0b5dSAlexander Aring spin_lock(&connections_lock); 19806f0b0b5dSAlexander Aring hlist_del_rcu(&con->list); 19816f0b0b5dSAlexander Aring spin_unlock(&connections_lock); 19826f0b0b5dSAlexander Aring 19836f0b0b5dSAlexander Aring if (con->othercon) 19846f0b0b5dSAlexander Aring call_srcu(&connections_srcu, &con->othercon->rcu, 19856f0b0b5dSAlexander Aring connection_release); 19866f0b0b5dSAlexander Aring call_srcu(&connections_srcu, &con->rcu, connection_release); 198736b71a8bSDavid Teigland } 19886f0b0b5dSAlexander Aring } 19896f0b0b5dSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 199036b71a8bSDavid Teigland } 1991