struct cbuf cb;
int retries;
#define MAX_CONNECT_RETRIES 3
- int sctp_assoc;
struct hlist_node list;
struct connection *othercon;
struct work_struct rwork; /* Receive workqueue */
struct work_struct swork; /* Send workqueue */
- bool try_new_addr;
+ void (*orig_error_report)(struct sock *sk);
};
#define sock2con(x) ((struct connection *)(x)->sk_user_data)
return con;
}
-/* This is a bit drastic, but only called when things go wrong */
-static struct connection *assoc2con(int assoc_id)
-{
- int i;
- struct connection *con;
-
- mutex_lock(&connections_lock);
-
- for (i = 0 ; i < CONN_HASH_SIZE; i++) {
- hlist_for_each_entry(con, &connection_hash[i], list) {
- if (con->sctp_assoc == assoc_id) {
- mutex_unlock(&connections_lock);
- return con;
- }
- }
- }
- mutex_unlock(&connections_lock);
- return NULL;
-}
-
static struct dlm_node_addr *find_node_addr(int nodeid)
{
struct dlm_node_addr *na;
spin_lock(&dlm_node_addrs_spin);
na = find_node_addr(nodeid);
if (na && na->addr_count) {
+ memcpy(&sas, na->addr[na->curr_addr_index],
+ sizeof(struct sockaddr_storage));
+
if (try_new_addr) {
na->curr_addr_index++;
if (na->curr_addr_index == na->addr_count)
na->curr_addr_index = 0;
}
-
- memcpy(&sas, na->addr[na->curr_addr_index ],
- sizeof(struct sockaddr_storage));
}
spin_unlock(&dlm_node_addrs_spin);
if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) {
con->sock->sk->sk_write_pending--;
- clear_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags);
+ clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags);
}
if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags))
static void lowcomms_state_change(struct sock *sk)
{
- if (sk->sk_state == TCP_ESTABLISHED)
+ /* SCTP layer is not calling sk_data_ready when the connection
+ * is done, so we catch the signal through here. Also, it
+ * doesn't switch socket state when entering shutdown, so we
+ * skip the write in that case.
+ */
+ if (sk->sk_shutdown) {
+ if (sk->sk_shutdown == RCV_SHUTDOWN)
+ lowcomms_data_ready(sk);
+ } else if (sk->sk_state == TCP_ESTABLISHED) {
lowcomms_write_space(sk);
+ }
}
int dlm_lowcomms_connect_node(int nodeid)
{
struct connection *con;
- /* with sctp there's no connecting without sending */
- if (dlm_config.ci_protocol != 0)
- return 0;
-
if (nodeid == dlm_our_nodeid())
return 0;
return 0;
}
+static void lowcomms_error_report(struct sock *sk)
+{
+ struct connection *con = sock2con(sk);
+ struct sockaddr_storage saddr;
+
+ if (nodeid_to_addr(con->nodeid, &saddr, NULL, false)) {
+ printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
+ "sending to node %d, port %d, "
+ "sk_err=%d/%d\n", dlm_our_nodeid(),
+ con->nodeid, dlm_config.ci_tcp_port,
+ sk->sk_err, sk->sk_err_soft);
+ return;
+ } else if (saddr.ss_family == AF_INET) {
+ struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr;
+
+ printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
+ "sending to node %d at %pI4, port %d, "
+ "sk_err=%d/%d\n", dlm_our_nodeid(),
+ con->nodeid, &sin4->sin_addr.s_addr,
+ dlm_config.ci_tcp_port, sk->sk_err,
+ sk->sk_err_soft);
+ } else {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr;
+
+ printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
+ "sending to node %d at %u.%u.%u.%u, "
+ "port %d, sk_err=%d/%d\n", dlm_our_nodeid(),
+ con->nodeid, sin6->sin6_addr.s6_addr32[0],
+ sin6->sin6_addr.s6_addr32[1],
+ sin6->sin6_addr.s6_addr32[2],
+ sin6->sin6_addr.s6_addr32[3],
+ dlm_config.ci_tcp_port, sk->sk_err,
+ sk->sk_err_soft);
+ }
+ con->orig_error_report(sk);
+}
+
/* Make a socket active */
static void add_sock(struct socket *sock, struct connection *con)
{
con->sock->sk->sk_state_change = lowcomms_state_change;
con->sock->sk->sk_user_data = con;
con->sock->sk->sk_allocation = GFP_NOFS;
+ con->orig_error_report = con->sock->sk->sk_error_report;
+ con->sock->sk->sk_error_report = lowcomms_error_report;
}
/* Add the port number to an IPv6 or 4 sockaddr and return the address
}
/* Close a remote connection and tidy up */
-static void close_connection(struct connection *con, bool and_other)
+static void close_connection(struct connection *con, bool and_other,
+ bool tx, bool rx)
{
- mutex_lock(&con->sock_mutex);
+ clear_bit(CF_CONNECT_PENDING, &con->flags);
+ clear_bit(CF_WRITE_PENDING, &con->flags);
+ if (tx && cancel_work_sync(&con->swork))
+ log_print("canceled swork for node %d", con->nodeid);
+ if (rx && cancel_work_sync(&con->rwork))
+ log_print("canceled rwork for node %d", con->nodeid);
+ mutex_lock(&con->sock_mutex);
if (con->sock) {
sock_release(con->sock);
con->sock = NULL;
}
if (con->othercon && and_other) {
/* Will only re-enter once. */
- close_connection(con->othercon, false);
+ close_connection(con->othercon, false, true, true);
}
if (con->rx_page) {
__free_page(con->rx_page);
mutex_unlock(&con->sock_mutex);
}
-/* We only send shutdown messages to nodes that are not part of the cluster */
-static void sctp_send_shutdown(sctp_assoc_t associd)
-{
- static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
- struct msghdr outmessage;
- struct cmsghdr *cmsg;
- struct sctp_sndrcvinfo *sinfo;
- int ret;
- struct connection *con;
-
- con = nodeid2con(0,0);
- BUG_ON(con == NULL);
-
- outmessage.msg_name = NULL;
- outmessage.msg_namelen = 0;
- outmessage.msg_control = outcmsg;
- outmessage.msg_controllen = sizeof(outcmsg);
- outmessage.msg_flags = MSG_EOR;
-
- cmsg = CMSG_FIRSTHDR(&outmessage);
- cmsg->cmsg_level = IPPROTO_SCTP;
- cmsg->cmsg_type = SCTP_SNDRCV;
- cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
- outmessage.msg_controllen = cmsg->cmsg_len;
- sinfo = CMSG_DATA(cmsg);
- memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
-
- sinfo->sinfo_flags |= MSG_EOF;
- sinfo->sinfo_assoc_id = associd;
-
- ret = kernel_sendmsg(con->sock, &outmessage, NULL, 0, 0);
-
- if (ret != 0)
- log_print("send EOF to node failed: %d", ret);
-}
-
-static void sctp_init_failed_foreach(struct connection *con)
-{
-
- /*
- * Don't try to recover base con and handle race where the
- * other node's assoc init creates a assoc and we get that
- * notification, then we get a notification that our attempt
- * failed due. This happens when we are still trying the primary
- * address, but the other node has already tried secondary addrs
- * and found one that worked.
- */
- if (!con->nodeid || con->sctp_assoc)
- return;
-
- log_print("Retrying SCTP association init for node %d\n", con->nodeid);
-
- con->try_new_addr = true;
- con->sctp_assoc = 0;
- if (test_and_clear_bit(CF_INIT_PENDING, &con->flags)) {
- if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags))
- queue_work(send_workqueue, &con->swork);
- }
-}
-
-/* INIT failed but we don't know which node...
- restart INIT on all pending nodes */
-static void sctp_init_failed(void)
-{
- mutex_lock(&connections_lock);
-
- foreach_conn(sctp_init_failed_foreach);
-
- mutex_unlock(&connections_lock);
-}
-
-static void retry_failed_sctp_send(struct connection *recv_con,
- struct sctp_send_failed *sn_send_failed,
- char *buf)
-{
- int len = sn_send_failed->ssf_length - sizeof(struct sctp_send_failed);
- struct dlm_mhandle *mh;
- struct connection *con;
- char *retry_buf;
- int nodeid = sn_send_failed->ssf_info.sinfo_ppid;
-
- log_print("Retry sending %d bytes to node id %d", len, nodeid);
-
- if (!nodeid) {
- log_print("Shouldn't resend data via listening connection.");
- return;
- }
-
- con = nodeid2con(nodeid, 0);
- if (!con) {
- log_print("Could not look up con for nodeid %d\n",
- nodeid);
- return;
- }
-
- mh = dlm_lowcomms_get_buffer(nodeid, len, GFP_NOFS, &retry_buf);
- if (!mh) {
- log_print("Could not allocate buf for retry.");
- return;
- }
- memcpy(retry_buf, buf + sizeof(struct sctp_send_failed), len);
- dlm_lowcomms_commit_buffer(mh);
-
- /*
- * If we got a assoc changed event before the send failed event then
- * we only need to retry the send.
- */
- if (con->sctp_assoc) {
- if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags))
- queue_work(send_workqueue, &con->swork);
- } else
- sctp_init_failed_foreach(con);
-}
-
-/* Something happened to an association */
-static void process_sctp_notification(struct connection *con,
- struct msghdr *msg, char *buf)
-{
- union sctp_notification *sn = (union sctp_notification *)buf;
- struct linger linger;
-
- switch (sn->sn_header.sn_type) {
- case SCTP_SEND_FAILED:
- retry_failed_sctp_send(con, &sn->sn_send_failed, buf);
- break;
- case SCTP_ASSOC_CHANGE:
- switch (sn->sn_assoc_change.sac_state) {
- case SCTP_COMM_UP:
- case SCTP_RESTART:
- {
- /* Check that the new node is in the lockspace */
- struct sctp_prim prim;
- int nodeid;
- int prim_len, ret;
- int addr_len;
- struct connection *new_con;
-
- /*
- * We get this before any data for an association.
- * We verify that the node is in the cluster and
- * then peel off a socket for it.
- */
- if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) {
- log_print("COMM_UP for invalid assoc ID %d",
- (int)sn->sn_assoc_change.sac_assoc_id);
- sctp_init_failed();
- return;
- }
- memset(&prim, 0, sizeof(struct sctp_prim));
- prim_len = sizeof(struct sctp_prim);
- prim.ssp_assoc_id = sn->sn_assoc_change.sac_assoc_id;
-
- ret = kernel_getsockopt(con->sock,
- IPPROTO_SCTP,
- SCTP_PRIMARY_ADDR,
- (char*)&prim,
- &prim_len);
- if (ret < 0) {
- log_print("getsockopt/sctp_primary_addr on "
- "new assoc %d failed : %d",
- (int)sn->sn_assoc_change.sac_assoc_id,
- ret);
-
- /* Retry INIT later */
- new_con = assoc2con(sn->sn_assoc_change.sac_assoc_id);
- if (new_con)
- clear_bit(CF_CONNECT_PENDING, &con->flags);
- return;
- }
- make_sockaddr(&prim.ssp_addr, 0, &addr_len);
- if (addr_to_nodeid(&prim.ssp_addr, &nodeid)) {
- unsigned char *b=(unsigned char *)&prim.ssp_addr;
- log_print("reject connect from unknown addr");
- print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE,
- b, sizeof(struct sockaddr_storage));
- sctp_send_shutdown(prim.ssp_assoc_id);
- return;
- }
-
- new_con = nodeid2con(nodeid, GFP_NOFS);
- if (!new_con)
- return;
-
- /* Peel off a new sock */
- lock_sock(con->sock->sk);
- ret = sctp_do_peeloff(con->sock->sk,
- sn->sn_assoc_change.sac_assoc_id,
- &new_con->sock);
- release_sock(con->sock->sk);
- if (ret < 0) {
- log_print("Can't peel off a socket for "
- "connection %d to node %d: err=%d",
- (int)sn->sn_assoc_change.sac_assoc_id,
- nodeid, ret);
- return;
- }
- add_sock(new_con->sock, new_con);
-
- linger.l_onoff = 1;
- linger.l_linger = 0;
- ret = kernel_setsockopt(new_con->sock, SOL_SOCKET, SO_LINGER,
- (char *)&linger, sizeof(linger));
- if (ret < 0)
- log_print("set socket option SO_LINGER failed");
-
- log_print("connecting to %d sctp association %d",
- nodeid, (int)sn->sn_assoc_change.sac_assoc_id);
-
- new_con->sctp_assoc = sn->sn_assoc_change.sac_assoc_id;
- new_con->try_new_addr = false;
- /* Send any pending writes */
- clear_bit(CF_CONNECT_PENDING, &new_con->flags);
- clear_bit(CF_INIT_PENDING, &new_con->flags);
- if (!test_and_set_bit(CF_WRITE_PENDING, &new_con->flags)) {
- queue_work(send_workqueue, &new_con->swork);
- }
- if (!test_and_set_bit(CF_READ_PENDING, &new_con->flags))
- queue_work(recv_workqueue, &new_con->rwork);
- }
- break;
-
- case SCTP_COMM_LOST:
- case SCTP_SHUTDOWN_COMP:
- {
- con = assoc2con(sn->sn_assoc_change.sac_assoc_id);
- if (con) {
- con->sctp_assoc = 0;
- }
- }
- break;
-
- case SCTP_CANT_STR_ASSOC:
- {
- /* Will retry init when we get the send failed notification */
- log_print("Can't start SCTP association - retrying");
- }
- break;
-
- default:
- log_print("unexpected SCTP assoc change id=%d state=%d",
- (int)sn->sn_assoc_change.sac_assoc_id,
- sn->sn_assoc_change.sac_state);
- }
- default:
- ; /* fall through */
- }
-}
-
/* Data received from remote end */
static int receive_from_sock(struct connection *con)
{
int r;
int call_again_soon = 0;
int nvec;
- char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
mutex_lock(&con->sock_mutex);
ret = -EAGAIN;
goto out_close;
}
+ if (con->nodeid == 0) {
+ ret = -EINVAL;
+ goto out_close;
+ }
if (con->rx_page == NULL) {
/*
cbuf_init(&con->cb, PAGE_CACHE_SIZE);
}
- /* Only SCTP needs these really */
- memset(&incmsg, 0, sizeof(incmsg));
- msg.msg_control = incmsg;
- msg.msg_controllen = sizeof(incmsg);
-
/*
* iov[0] is the bit of the circular buffer between the current end
* point (cb.base + cb.len) and the end of the buffer.
MSG_DONTWAIT | MSG_NOSIGNAL);
if (ret <= 0)
goto out_close;
-
- /* Process SCTP notifications */
- if (msg.msg_flags & MSG_NOTIFICATION) {
- msg.msg_control = incmsg;
- msg.msg_controllen = sizeof(incmsg);
-
- process_sctp_notification(con, &msg,
- page_address(con->rx_page) + con->cb.base);
- mutex_unlock(&con->sock_mutex);
- return 0;
- }
- BUG_ON(con->nodeid == 0);
-
- if (ret == len)
+ else if (ret == len)
call_again_soon = 1;
+
cbuf_add(&con->cb, ret);
ret = dlm_process_incoming_buffer(con->nodeid,
page_address(con->rx_page),
con->cb.base, con->cb.len,
PAGE_CACHE_SIZE);
if (ret == -EBADMSG) {
- log_print("lowcomms: addr=%p, base=%u, len=%u, "
- "iov_len=%u, iov_base[0]=%p, read=%d",
- page_address(con->rx_page), con->cb.base, con->cb.len,
- len, iov[0].iov_base, r);
+ log_print("lowcomms: addr=%p, base=%u, len=%u, read=%d",
+ page_address(con->rx_page), con->cb.base,
+ con->cb.len, r);
}
if (ret < 0)
goto out_close;
out_close:
mutex_unlock(&con->sock_mutex);
if (ret != -EAGAIN) {
- close_connection(con, false);
+ close_connection(con, false, true, false);
/* Reconnect when there is something to send */
}
/* Don't return success if we really got EOF */
mutex_unlock(&connections_lock);
memset(&peeraddr, 0, sizeof(peeraddr));
- result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM,
- IPPROTO_TCP, &newsock);
+ result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
+ SOCK_STREAM, IPPROTO_TCP, &newsock);
if (result < 0)
return -ENOMEM;
return result;
}
+static int sctp_accept_from_sock(struct connection *con)
+{
+ /* Check that the new node is in the lockspace */
+ struct sctp_prim prim;
+ int nodeid;
+ int prim_len, ret;
+ int addr_len;
+ struct connection *newcon;
+ struct connection *addcon;
+ struct socket *newsock;
+
+ mutex_lock(&connections_lock);
+ if (!dlm_allow_conn) {
+ mutex_unlock(&connections_lock);
+ return -1;
+ }
+ mutex_unlock(&connections_lock);
+
+ mutex_lock_nested(&con->sock_mutex, 0);
+
+ ret = kernel_accept(con->sock, &newsock, O_NONBLOCK);
+ if (ret < 0)
+ goto accept_err;
+
+ memset(&prim, 0, sizeof(struct sctp_prim));
+ prim_len = sizeof(struct sctp_prim);
+
+ ret = kernel_getsockopt(newsock, IPPROTO_SCTP, SCTP_PRIMARY_ADDR,
+ (char *)&prim, &prim_len);
+ if (ret < 0) {
+ log_print("getsockopt/sctp_primary_addr failed: %d", ret);
+ goto accept_err;
+ }
+
+ make_sockaddr(&prim.ssp_addr, 0, &addr_len);
+ if (addr_to_nodeid(&prim.ssp_addr, &nodeid)) {
+ unsigned char *b = (unsigned char *)&prim.ssp_addr;
+
+ log_print("reject connect from unknown addr");
+ print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE,
+ b, sizeof(struct sockaddr_storage));
+ goto accept_err;
+ }
+
+ newcon = nodeid2con(nodeid, GFP_NOFS);
+ if (!newcon) {
+ ret = -ENOMEM;
+ goto accept_err;
+ }
+
+ mutex_lock_nested(&newcon->sock_mutex, 1);
+
+ if (newcon->sock) {
+ struct connection *othercon = newcon->othercon;
+
+ if (!othercon) {
+ othercon = kmem_cache_zalloc(con_cache, GFP_NOFS);
+ if (!othercon) {
+ log_print("failed to allocate incoming socket");
+ mutex_unlock(&newcon->sock_mutex);
+ ret = -ENOMEM;
+ goto accept_err;
+ }
+ othercon->nodeid = nodeid;
+ othercon->rx_action = receive_from_sock;
+ mutex_init(&othercon->sock_mutex);
+ INIT_WORK(&othercon->swork, process_send_sockets);
+ INIT_WORK(&othercon->rwork, process_recv_sockets);
+ set_bit(CF_IS_OTHERCON, &othercon->flags);
+ }
+ if (!othercon->sock) {
+ newcon->othercon = othercon;
+ othercon->sock = newsock;
+ newsock->sk->sk_user_data = othercon;
+ add_sock(newsock, othercon);
+ addcon = othercon;
+ } else {
+ printk("Extra connection from node %d attempted\n", nodeid);
+ ret = -EAGAIN;
+ mutex_unlock(&newcon->sock_mutex);
+ goto accept_err;
+ }
+ } else {
+ newsock->sk->sk_user_data = newcon;
+ newcon->rx_action = receive_from_sock;
+ add_sock(newsock, newcon);
+ addcon = newcon;
+ }
+
+ log_print("connected to %d", nodeid);
+
+ mutex_unlock(&newcon->sock_mutex);
+
+ /*
+ * Add it to the active queue in case we got data
+ * between processing the accept adding the socket
+ * to the read_sockets list
+ */
+ if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags))
+ queue_work(recv_workqueue, &addcon->rwork);
+ mutex_unlock(&con->sock_mutex);
+
+ return 0;
+
+accept_err:
+ mutex_unlock(&con->sock_mutex);
+ if (newsock)
+ sock_release(newsock);
+ if (ret != -EAGAIN)
+ log_print("error accepting connection from node: %d", ret);
+
+ return ret;
+}
+
static void free_entry(struct writequeue_entry *e)
{
__free_page(e->page);
}
}
+/*
+ * sctp_bind_addrs - bind a SCTP socket to all our addresses
+ */
+static int sctp_bind_addrs(struct connection *con, uint16_t port)
+{
+ struct sockaddr_storage localaddr;
+ int i, addr_len, result = 0;
+
+ for (i = 0; i < dlm_local_count; i++) {
+ memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr));
+ make_sockaddr(&localaddr, port, &addr_len);
+
+ if (!i)
+ result = kernel_bind(con->sock,
+ (struct sockaddr *)&localaddr,
+ addr_len);
+ else
+ result = kernel_setsockopt(con->sock, SOL_SCTP,
+ SCTP_SOCKOPT_BINDX_ADD,
+ (char *)&localaddr, addr_len);
+
+ if (result < 0) {
+ log_print("Can't bind to %d addr number %d, %d.\n",
+ port, i + 1, result);
+ break;
+ }
+ }
+ return result;
+}
+
/* Initiate an SCTP association.
This is a special case of send_to_sock() in that we don't yet have a
peeled-off socket for this association, so we use the listening socket
and add the primary IP address of the remote node.
*/
-static void sctp_init_assoc(struct connection *con)
+static void sctp_connect_to_sock(struct connection *con)
{
- struct sockaddr_storage rem_addr;
- char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
- struct msghdr outmessage;
- struct cmsghdr *cmsg;
- struct sctp_sndrcvinfo *sinfo;
- struct connection *base_con;
- struct writequeue_entry *e;
- int len, offset;
- int ret;
- int addrlen;
- struct kvec iov[1];
+ struct sockaddr_storage daddr;
+ int one = 1;
+ int result;
+ int addr_len;
+ struct socket *sock;
+
+ if (con->nodeid == 0) {
+ log_print("attempt to connect sock 0 foiled");
+ return;
+ }
mutex_lock(&con->sock_mutex);
- if (test_and_set_bit(CF_INIT_PENDING, &con->flags))
- goto unlock;
- if (nodeid_to_addr(con->nodeid, NULL, (struct sockaddr *)&rem_addr,
- con->try_new_addr)) {
+ /* Some odd races can cause double-connects, ignore them */
+ if (con->retries++ > MAX_CONNECT_RETRIES)
+ goto out;
+
+ if (con->sock) {
+ log_print("node %d already connected.", con->nodeid);
+ goto out;
+ }
+
+ memset(&daddr, 0, sizeof(daddr));
+ result = nodeid_to_addr(con->nodeid, &daddr, NULL, true);
+ if (result < 0) {
log_print("no address for nodeid %d", con->nodeid);
- goto unlock;
+ goto out;
}
- base_con = nodeid2con(0, 0);
- BUG_ON(base_con == NULL);
- make_sockaddr(&rem_addr, dlm_config.ci_tcp_port, &addrlen);
+ /* Create a socket to communicate with */
+ result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
+ SOCK_STREAM, IPPROTO_SCTP, &sock);
+ if (result < 0)
+ goto socket_err;
- outmessage.msg_name = &rem_addr;
- outmessage.msg_namelen = addrlen;
- outmessage.msg_control = outcmsg;
- outmessage.msg_controllen = sizeof(outcmsg);
- outmessage.msg_flags = MSG_EOR;
+ sock->sk->sk_user_data = con;
+ con->rx_action = receive_from_sock;
+ con->connect_action = sctp_connect_to_sock;
+ add_sock(sock, con);
- spin_lock(&con->writequeue_lock);
+ /* Bind to all addresses. */
+ if (sctp_bind_addrs(con, 0))
+ goto bind_err;
- if (list_empty(&con->writequeue)) {
- spin_unlock(&con->writequeue_lock);
- log_print("writequeue empty for nodeid %d", con->nodeid);
- goto unlock;
- }
+ make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len);
- e = list_first_entry(&con->writequeue, struct writequeue_entry, list);
- len = e->len;
- offset = e->offset;
+ log_print("connecting to %d", con->nodeid);
- /* Send the first block off the write queue */
- iov[0].iov_base = page_address(e->page)+offset;
- iov[0].iov_len = len;
- spin_unlock(&con->writequeue_lock);
+ /* Turn off Nagle's algorithm */
+ kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one,
+ sizeof(one));
- if (rem_addr.ss_family == AF_INET) {
- struct sockaddr_in *sin = (struct sockaddr_in *)&rem_addr;
- log_print("Trying to connect to %pI4", &sin->sin_addr.s_addr);
- } else {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&rem_addr;
- log_print("Trying to connect to %pI6", &sin6->sin6_addr);
- }
+ result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len,
+ O_NONBLOCK);
+ if (result == -EINPROGRESS)
+ result = 0;
+ if (result == 0)
+ goto out;
- cmsg = CMSG_FIRSTHDR(&outmessage);
- cmsg->cmsg_level = IPPROTO_SCTP;
- cmsg->cmsg_type = SCTP_SNDRCV;
- cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
- sinfo = CMSG_DATA(cmsg);
- memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
- sinfo->sinfo_ppid = cpu_to_le32(con->nodeid);
- outmessage.msg_controllen = cmsg->cmsg_len;
- sinfo->sinfo_flags |= SCTP_ADDR_OVER;
- ret = kernel_sendmsg(base_con->sock, &outmessage, iov, 1, len);
- if (ret < 0) {
- log_print("Send first packet to node %d failed: %d",
- con->nodeid, ret);
+bind_err:
+ con->sock = NULL;
+ sock_release(sock);
- /* Try again later */
+socket_err:
+ /*
+ * Some errors are fatal and this list might need adjusting. For other
+ * errors we try again until the max number of retries is reached.
+ */
+ if (result != -EHOSTUNREACH &&
+ result != -ENETUNREACH &&
+ result != -ENETDOWN &&
+ result != -EINVAL &&
+ result != -EPROTONOSUPPORT) {
+ log_print("connect %d try %d error %d", con->nodeid,
+ con->retries, result);
+ mutex_unlock(&con->sock_mutex);
+ msleep(1000);
clear_bit(CF_CONNECT_PENDING, &con->flags);
- clear_bit(CF_INIT_PENDING, &con->flags);
- }
- else {
- spin_lock(&con->writequeue_lock);
- writequeue_entry_complete(e, ret);
- spin_unlock(&con->writequeue_lock);
+ lowcomms_connect_sock(con);
+ return;
}
-unlock:
+out:
mutex_unlock(&con->sock_mutex);
+ set_bit(CF_WRITE_PENDING, &con->flags);
}
/* Connect a new socket to its peer */
goto out;
/* Create a socket to communicate with */
- result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM,
- IPPROTO_TCP, &sock);
+ result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
+ SOCK_STREAM, IPPROTO_TCP, &sock);
if (result < 0)
goto out_err;
con->retries, result);
mutex_unlock(&con->sock_mutex);
msleep(1000);
+ clear_bit(CF_CONNECT_PENDING, &con->flags);
lowcomms_connect_sock(con);
return;
}
out:
mutex_unlock(&con->sock_mutex);
+ set_bit(CF_WRITE_PENDING, &con->flags);
return;
}
addr_len = sizeof(struct sockaddr_in6);
/* Create a socket to communicate with */
- result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM,
- IPPROTO_TCP, &sock);
+ result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
+ SOCK_STREAM, IPPROTO_TCP, &sock);
if (result < 0) {
log_print("Can't create listening comms socket");
goto create_out;
}
}
-/* Bind to an IP address. SCTP allows multiple address so it can do
- multi-homing */
-static int add_sctp_bind_addr(struct connection *sctp_con,
- struct sockaddr_storage *addr,
- int addr_len, int num)
-{
- int result = 0;
-
- if (num == 1)
- result = kernel_bind(sctp_con->sock,
- (struct sockaddr *) addr,
- addr_len);
- else
- result = kernel_setsockopt(sctp_con->sock, SOL_SCTP,
- SCTP_SOCKOPT_BINDX_ADD,
- (char *)addr, addr_len);
-
- if (result < 0)
- log_print("Can't bind to port %d addr number %d",
- dlm_config.ci_tcp_port, num);
-
- return result;
-}
-
/* Initialise SCTP socket and bind to all interfaces */
static int sctp_listen_for_all(void)
{
struct socket *sock = NULL;
- struct sockaddr_storage localaddr;
- struct sctp_event_subscribe subscribe;
- int result = -EINVAL, num = 1, i, addr_len;
+ int result = -EINVAL;
struct connection *con = nodeid2con(0, GFP_NOFS);
int bufsize = NEEDED_RMEM;
int one = 1;
log_print("Using SCTP for communications");
- result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_SEQPACKET,
- IPPROTO_SCTP, &sock);
+ result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
+ SOCK_STREAM, IPPROTO_SCTP, &sock);
if (result < 0) {
log_print("Can't create comms socket, check SCTP is loaded");
goto out;
}
- /* Listen for events */
- memset(&subscribe, 0, sizeof(subscribe));
- subscribe.sctp_data_io_event = 1;
- subscribe.sctp_association_event = 1;
- subscribe.sctp_send_failure_event = 1;
- subscribe.sctp_shutdown_event = 1;
- subscribe.sctp_partial_delivery_event = 1;
-
result = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE,
(char *)&bufsize, sizeof(bufsize));
if (result)
log_print("Error increasing buffer space on socket %d", result);
- result = kernel_setsockopt(sock, SOL_SCTP, SCTP_EVENTS,
- (char *)&subscribe, sizeof(subscribe));
- if (result < 0) {
- log_print("Failed to set SCTP_EVENTS on socket: result=%d",
- result);
- goto create_delsock;
- }
-
result = kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one,
sizeof(one));
if (result < 0)
sock->sk->sk_user_data = con;
con->sock = sock;
con->sock->sk->sk_data_ready = lowcomms_data_ready;
- con->rx_action = receive_from_sock;
- con->connect_action = sctp_init_assoc;
+ con->rx_action = sctp_accept_from_sock;
+ con->connect_action = sctp_connect_to_sock;
- /* Bind to all interfaces. */
- for (i = 0; i < dlm_local_count; i++) {
- memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr));
- make_sockaddr(&localaddr, dlm_config.ci_tcp_port, &addr_len);
-
- result = add_sctp_bind_addr(con, &localaddr, addr_len, num);
- if (result)
- goto create_delsock;
- ++num;
- }
+ /* Bind to all addresses. */
+ if (sctp_bind_addrs(con, dlm_config.ci_tcp_port))
+ goto create_delsock;
result = sock->ops->listen(sock, 5);
if (result < 0) {
msg_flags);
if (ret == -EAGAIN || ret == 0) {
if (ret == -EAGAIN &&
- test_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags) &&
+ test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) &&
!test_and_set_bit(CF_APP_LIMITED, &con->flags)) {
/* Notify TCP that we're limited by the
* application window size.
send_error:
mutex_unlock(&con->sock_mutex);
- close_connection(con, false);
+ close_connection(con, false, false, true);
lowcomms_connect_sock(con);
return;
out_connect:
mutex_unlock(&con->sock_mutex);
- if (!test_bit(CF_INIT_PENDING, &con->flags))
- lowcomms_connect_sock(con);
+ lowcomms_connect_sock(con);
}
static void clean_one_writequeue(struct connection *con)
log_print("closing connection to node %d", nodeid);
con = nodeid2con(nodeid, 0);
if (con) {
- clear_bit(CF_CONNECT_PENDING, &con->flags);
- clear_bit(CF_WRITE_PENDING, &con->flags);
set_bit(CF_CLOSE, &con->flags);
- if (cancel_work_sync(&con->swork))
- log_print("canceled swork for node %d", nodeid);
- if (cancel_work_sync(&con->rwork))
- log_print("canceled rwork for node %d", nodeid);
+ close_connection(con, true, true, true);
clean_one_writequeue(con);
- close_connection(con, true);
}
spin_lock(&dlm_node_addrs_spin);
{
struct connection *con = container_of(work, struct connection, swork);
- if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) {
+ if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags))
con->connect_action(con);
- set_bit(CF_WRITE_PENDING, &con->flags);
- }
if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags))
send_to_sock(con);
}
static void free_conn(struct connection *con)
{
- close_connection(con, true);
+ close_connection(con, true, true, true);
if (con->othercon)
kmem_cache_free(con_cache, con->othercon);
hlist_del(&con->list);
dlm_allow_conn = 0;
con = nodeid2con(0,0);
if (con) {
- close_connection(con, false);
+ close_connection(con, false, true, true);
kmem_cache_free(con_cache, con);
}
fail_destroy:
Code Review / kvmfornfv.git / blobdiff