linux/net/ceph/messenger_v1.c
Al Viro de4eda9de2 use less confusing names for iov_iter direction initializers
READ/WRITE proved to be actively confusing - the meanings are
"data destination, as used with read(2)" and "data source, as
used with write(2)", but people keep interpreting those as
"we read data from it" and "we write data to it", i.e. exactly
the wrong way.

Call them ITER_DEST and ITER_SOURCE - at least that is harder
to misinterpret...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2022-11-25 13:01:55 -05:00

1549 lines
39 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>
#include <linux/bvec.h>
#include <linux/crc32c.h>
#include <linux/net.h>
#include <linux/socket.h>
#include <net/sock.h>
#include <linux/ceph/ceph_features.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/libceph.h>
#include <linux/ceph/messenger.h>
/* static tag bytes (protocol control messages) */
static char tag_msg = CEPH_MSGR_TAG_MSG;
static char tag_ack = CEPH_MSGR_TAG_ACK;
static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2;
/*
* If @buf is NULL, discard up to @len bytes.
*/
static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
{
struct kvec iov = {buf, len};
struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
int r;
if (!buf)
msg.msg_flags |= MSG_TRUNC;
iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, len);
r = sock_recvmsg(sock, &msg, msg.msg_flags);
if (r == -EAGAIN)
r = 0;
return r;
}
static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
int page_offset, size_t length)
{
struct bio_vec bvec = {
.bv_page = page,
.bv_offset = page_offset,
.bv_len = length
};
struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
int r;
BUG_ON(page_offset + length > PAGE_SIZE);
iov_iter_bvec(&msg.msg_iter, ITER_DEST, &bvec, 1, length);
r = sock_recvmsg(sock, &msg, msg.msg_flags);
if (r == -EAGAIN)
r = 0;
return r;
}
/*
* write something. @more is true if caller will be sending more data
* shortly.
*/
static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
size_t kvlen, size_t len, bool more)
{
struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
int r;
if (more)
msg.msg_flags |= MSG_MORE;
else
msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
if (r == -EAGAIN)
r = 0;
return r;
}
/*
* @more: either or both of MSG_MORE and MSG_SENDPAGE_NOTLAST
*/
static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
int offset, size_t size, int more)
{
ssize_t (*sendpage)(struct socket *sock, struct page *page,
int offset, size_t size, int flags);
int flags = MSG_DONTWAIT | MSG_NOSIGNAL | more;
int ret;
/*
* sendpage cannot properly handle pages with page_count == 0,
* we need to fall back to sendmsg if that's the case.
*
* Same goes for slab pages: skb_can_coalesce() allows
* coalescing neighboring slab objects into a single frag which
* triggers one of hardened usercopy checks.
*/
if (sendpage_ok(page))
sendpage = sock->ops->sendpage;
else
sendpage = sock_no_sendpage;
ret = sendpage(sock, page, offset, size, flags);
if (ret == -EAGAIN)
ret = 0;
return ret;
}
static void con_out_kvec_reset(struct ceph_connection *con)
{
BUG_ON(con->v1.out_skip);
con->v1.out_kvec_left = 0;
con->v1.out_kvec_bytes = 0;
con->v1.out_kvec_cur = &con->v1.out_kvec[0];
}
static void con_out_kvec_add(struct ceph_connection *con,
size_t size, void *data)
{
int index = con->v1.out_kvec_left;
BUG_ON(con->v1.out_skip);
BUG_ON(index >= ARRAY_SIZE(con->v1.out_kvec));
con->v1.out_kvec[index].iov_len = size;
con->v1.out_kvec[index].iov_base = data;
con->v1.out_kvec_left++;
con->v1.out_kvec_bytes += size;
}
/*
* Chop off a kvec from the end. Return residual number of bytes for
* that kvec, i.e. how many bytes would have been written if the kvec
* hadn't been nuked.
*/
static int con_out_kvec_skip(struct ceph_connection *con)
{
int skip = 0;
if (con->v1.out_kvec_bytes > 0) {
skip = con->v1.out_kvec_cur[con->v1.out_kvec_left - 1].iov_len;
BUG_ON(con->v1.out_kvec_bytes < skip);
BUG_ON(!con->v1.out_kvec_left);
con->v1.out_kvec_bytes -= skip;
con->v1.out_kvec_left--;
}
return skip;
}
static size_t sizeof_footer(struct ceph_connection *con)
{
return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ?
sizeof(struct ceph_msg_footer) :
sizeof(struct ceph_msg_footer_old);
}
static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
{
/* Initialize data cursor */
ceph_msg_data_cursor_init(&msg->cursor, msg, data_len);
}
/*
* Prepare footer for currently outgoing message, and finish things
* off. Assumes out_kvec* are already valid.. we just add on to the end.
*/
static void prepare_write_message_footer(struct ceph_connection *con)
{
struct ceph_msg *m = con->out_msg;
m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
dout("prepare_write_message_footer %p\n", con);
con_out_kvec_add(con, sizeof_footer(con), &m->footer);
if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
if (con->ops->sign_message)
con->ops->sign_message(m);
else
m->footer.sig = 0;
} else {
m->old_footer.flags = m->footer.flags;
}
con->v1.out_more = m->more_to_follow;
con->v1.out_msg_done = true;
}
/*
* Prepare headers for the next outgoing message.
*/
static void prepare_write_message(struct ceph_connection *con)
{
struct ceph_msg *m;
u32 crc;
con_out_kvec_reset(con);
con->v1.out_msg_done = false;
/* Sneak an ack in there first? If we can get it into the same
* TCP packet that's a good thing. */
if (con->in_seq > con->in_seq_acked) {
con->in_seq_acked = con->in_seq;
con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
&con->v1.out_temp_ack);
}
ceph_con_get_out_msg(con);
m = con->out_msg;
dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
m, con->out_seq, le16_to_cpu(m->hdr.type),
le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
m->data_length);
WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len));
WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
/* tag + hdr + front + middle */
con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
con_out_kvec_add(con, sizeof(con->v1.out_hdr), &con->v1.out_hdr);
con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
if (m->middle)
con_out_kvec_add(con, m->middle->vec.iov_len,
m->middle->vec.iov_base);
/* fill in hdr crc and finalize hdr */
crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
con->out_msg->hdr.crc = cpu_to_le32(crc);
memcpy(&con->v1.out_hdr, &con->out_msg->hdr, sizeof(con->v1.out_hdr));
/* fill in front and middle crc, footer */
crc = crc32c(0, m->front.iov_base, m->front.iov_len);
con->out_msg->footer.front_crc = cpu_to_le32(crc);
if (m->middle) {
crc = crc32c(0, m->middle->vec.iov_base,
m->middle->vec.iov_len);
con->out_msg->footer.middle_crc = cpu_to_le32(crc);
} else
con->out_msg->footer.middle_crc = 0;
dout("%s front_crc %u middle_crc %u\n", __func__,
le32_to_cpu(con->out_msg->footer.front_crc),
le32_to_cpu(con->out_msg->footer.middle_crc));
con->out_msg->footer.flags = 0;
/* is there a data payload? */
con->out_msg->footer.data_crc = 0;
if (m->data_length) {
prepare_message_data(con->out_msg, m->data_length);
con->v1.out_more = 1; /* data + footer will follow */
} else {
/* no, queue up footer too and be done */
prepare_write_message_footer(con);
}
ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
}
/*
* Prepare an ack.
*/
static void prepare_write_ack(struct ceph_connection *con)
{
dout("prepare_write_ack %p %llu -> %llu\n", con,
con->in_seq_acked, con->in_seq);
con->in_seq_acked = con->in_seq;
con_out_kvec_reset(con);
con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
&con->v1.out_temp_ack);
con->v1.out_more = 1; /* more will follow.. eventually.. */
ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
}
/*
* Prepare to share the seq during handshake
*/
static void prepare_write_seq(struct ceph_connection *con)
{
dout("prepare_write_seq %p %llu -> %llu\n", con,
con->in_seq_acked, con->in_seq);
con->in_seq_acked = con->in_seq;
con_out_kvec_reset(con);
con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
&con->v1.out_temp_ack);
ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
}
/*
* Prepare to write keepalive byte.
*/
static void prepare_write_keepalive(struct ceph_connection *con)
{
dout("prepare_write_keepalive %p\n", con);
con_out_kvec_reset(con);
if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
struct timespec64 now;
ktime_get_real_ts64(&now);
con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
ceph_encode_timespec64(&con->v1.out_temp_keepalive2, &now);
con_out_kvec_add(con, sizeof(con->v1.out_temp_keepalive2),
&con->v1.out_temp_keepalive2);
} else {
con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
}
ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
}
/*
* Connection negotiation.
*/
static int get_connect_authorizer(struct ceph_connection *con)
{
struct ceph_auth_handshake *auth;
int auth_proto;
if (!con->ops->get_authorizer) {
con->v1.auth = NULL;
con->v1.out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
con->v1.out_connect.authorizer_len = 0;
return 0;
}
auth = con->ops->get_authorizer(con, &auth_proto, con->v1.auth_retry);
if (IS_ERR(auth))
return PTR_ERR(auth);
con->v1.auth = auth;
con->v1.out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
con->v1.out_connect.authorizer_len =
cpu_to_le32(auth->authorizer_buf_len);
return 0;
}
/*
* We connected to a peer and are saying hello.
*/
static void prepare_write_banner(struct ceph_connection *con)
{
con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
&con->msgr->my_enc_addr);
con->v1.out_more = 0;
ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
}
static void __prepare_write_connect(struct ceph_connection *con)
{
con_out_kvec_add(con, sizeof(con->v1.out_connect),
&con->v1.out_connect);
if (con->v1.auth)
con_out_kvec_add(con, con->v1.auth->authorizer_buf_len,
con->v1.auth->authorizer_buf);
con->v1.out_more = 0;
ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
}
static int prepare_write_connect(struct ceph_connection *con)
{
unsigned int global_seq = ceph_get_global_seq(con->msgr, 0);
int proto;
int ret;
switch (con->peer_name.type) {
case CEPH_ENTITY_TYPE_MON:
proto = CEPH_MONC_PROTOCOL;
break;
case CEPH_ENTITY_TYPE_OSD:
proto = CEPH_OSDC_PROTOCOL;
break;
case CEPH_ENTITY_TYPE_MDS:
proto = CEPH_MDSC_PROTOCOL;
break;
default:
BUG();
}
dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
con->v1.connect_seq, global_seq, proto);
con->v1.out_connect.features =
cpu_to_le64(from_msgr(con->msgr)->supported_features);
con->v1.out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
con->v1.out_connect.connect_seq = cpu_to_le32(con->v1.connect_seq);
con->v1.out_connect.global_seq = cpu_to_le32(global_seq);
con->v1.out_connect.protocol_version = cpu_to_le32(proto);
con->v1.out_connect.flags = 0;
ret = get_connect_authorizer(con);
if (ret)
return ret;
__prepare_write_connect(con);
return 0;
}
/*
* write as much of pending kvecs to the socket as we can.
* 1 -> done
* 0 -> socket full, but more to do
* <0 -> error
*/
static int write_partial_kvec(struct ceph_connection *con)
{
int ret;
dout("write_partial_kvec %p %d left\n", con, con->v1.out_kvec_bytes);
while (con->v1.out_kvec_bytes > 0) {
ret = ceph_tcp_sendmsg(con->sock, con->v1.out_kvec_cur,
con->v1.out_kvec_left,
con->v1.out_kvec_bytes,
con->v1.out_more);
if (ret <= 0)
goto out;
con->v1.out_kvec_bytes -= ret;
if (!con->v1.out_kvec_bytes)
break; /* done */
/* account for full iov entries consumed */
while (ret >= con->v1.out_kvec_cur->iov_len) {
BUG_ON(!con->v1.out_kvec_left);
ret -= con->v1.out_kvec_cur->iov_len;
con->v1.out_kvec_cur++;
con->v1.out_kvec_left--;
}
/* and for a partially-consumed entry */
if (ret) {
con->v1.out_kvec_cur->iov_len -= ret;
con->v1.out_kvec_cur->iov_base += ret;
}
}
con->v1.out_kvec_left = 0;
ret = 1;
out:
dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
con->v1.out_kvec_bytes, con->v1.out_kvec_left, ret);
return ret; /* done! */
}
/*
* Write as much message data payload as we can. If we finish, queue
* up the footer.
* 1 -> done, footer is now queued in out_kvec[].
* 0 -> socket full, but more to do
* <0 -> error
*/
static int write_partial_message_data(struct ceph_connection *con)
{
struct ceph_msg *msg = con->out_msg;
struct ceph_msg_data_cursor *cursor = &msg->cursor;
bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
int more = MSG_MORE | MSG_SENDPAGE_NOTLAST;
u32 crc;
dout("%s %p msg %p\n", __func__, con, msg);
if (!msg->num_data_items)
return -EINVAL;
/*
* Iterate through each page that contains data to be
* written, and send as much as possible for each.
*
* If we are calculating the data crc (the default), we will
* need to map the page. If we have no pages, they have
* been revoked, so use the zero page.
*/
crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
while (cursor->total_resid) {
struct page *page;
size_t page_offset;
size_t length;
int ret;
if (!cursor->resid) {
ceph_msg_data_advance(cursor, 0);
continue;
}
page = ceph_msg_data_next(cursor, &page_offset, &length);
if (length == cursor->total_resid)
more = MSG_MORE;
ret = ceph_tcp_sendpage(con->sock, page, page_offset, length,
more);
if (ret <= 0) {
if (do_datacrc)
msg->footer.data_crc = cpu_to_le32(crc);
return ret;
}
if (do_datacrc && cursor->need_crc)
crc = ceph_crc32c_page(crc, page, page_offset, length);
ceph_msg_data_advance(cursor, (size_t)ret);
}
dout("%s %p msg %p done\n", __func__, con, msg);
/* prepare and queue up footer, too */
if (do_datacrc)
msg->footer.data_crc = cpu_to_le32(crc);
else
msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
con_out_kvec_reset(con);
prepare_write_message_footer(con);
return 1; /* must return > 0 to indicate success */
}
/*
* write some zeros
*/
static int write_partial_skip(struct ceph_connection *con)
{
int more = MSG_MORE | MSG_SENDPAGE_NOTLAST;
int ret;
dout("%s %p %d left\n", __func__, con, con->v1.out_skip);
while (con->v1.out_skip > 0) {
size_t size = min(con->v1.out_skip, (int)PAGE_SIZE);
if (size == con->v1.out_skip)
more = MSG_MORE;
ret = ceph_tcp_sendpage(con->sock, ceph_zero_page, 0, size,
more);
if (ret <= 0)
goto out;
con->v1.out_skip -= ret;
}
ret = 1;
out:
return ret;
}
/*
* Prepare to read connection handshake, or an ack.
*/
static void prepare_read_banner(struct ceph_connection *con)
{
dout("prepare_read_banner %p\n", con);
con->v1.in_base_pos = 0;
}
static void prepare_read_connect(struct ceph_connection *con)
{
dout("prepare_read_connect %p\n", con);
con->v1.in_base_pos = 0;
}
static void prepare_read_ack(struct ceph_connection *con)
{
dout("prepare_read_ack %p\n", con);
con->v1.in_base_pos = 0;
}
static void prepare_read_seq(struct ceph_connection *con)
{
dout("prepare_read_seq %p\n", con);
con->v1.in_base_pos = 0;
con->v1.in_tag = CEPH_MSGR_TAG_SEQ;
}
static void prepare_read_tag(struct ceph_connection *con)
{
dout("prepare_read_tag %p\n", con);
con->v1.in_base_pos = 0;
con->v1.in_tag = CEPH_MSGR_TAG_READY;
}
static void prepare_read_keepalive_ack(struct ceph_connection *con)
{
dout("prepare_read_keepalive_ack %p\n", con);
con->v1.in_base_pos = 0;
}
/*
* Prepare to read a message.
*/
static int prepare_read_message(struct ceph_connection *con)
{
dout("prepare_read_message %p\n", con);
BUG_ON(con->in_msg != NULL);
con->v1.in_base_pos = 0;
con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
return 0;
}
static int read_partial(struct ceph_connection *con,
int end, int size, void *object)
{
while (con->v1.in_base_pos < end) {
int left = end - con->v1.in_base_pos;
int have = size - left;
int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
if (ret <= 0)
return ret;
con->v1.in_base_pos += ret;
}
return 1;
}
/*
* Read all or part of the connect-side handshake on a new connection
*/
static int read_partial_banner(struct ceph_connection *con)
{
int size;
int end;
int ret;
dout("read_partial_banner %p at %d\n", con, con->v1.in_base_pos);
/* peer's banner */
size = strlen(CEPH_BANNER);
end = size;
ret = read_partial(con, end, size, con->v1.in_banner);
if (ret <= 0)
goto out;
size = sizeof(con->v1.actual_peer_addr);
end += size;
ret = read_partial(con, end, size, &con->v1.actual_peer_addr);
if (ret <= 0)
goto out;
ceph_decode_banner_addr(&con->v1.actual_peer_addr);
size = sizeof(con->v1.peer_addr_for_me);
end += size;
ret = read_partial(con, end, size, &con->v1.peer_addr_for_me);
if (ret <= 0)
goto out;
ceph_decode_banner_addr(&con->v1.peer_addr_for_me);
out:
return ret;
}
static int read_partial_connect(struct ceph_connection *con)
{
int size;
int end;
int ret;
dout("read_partial_connect %p at %d\n", con, con->v1.in_base_pos);
size = sizeof(con->v1.in_reply);
end = size;
ret = read_partial(con, end, size, &con->v1.in_reply);
if (ret <= 0)
goto out;
if (con->v1.auth) {
size = le32_to_cpu(con->v1.in_reply.authorizer_len);
if (size > con->v1.auth->authorizer_reply_buf_len) {
pr_err("authorizer reply too big: %d > %zu\n", size,
con->v1.auth->authorizer_reply_buf_len);
ret = -EINVAL;
goto out;
}
end += size;
ret = read_partial(con, end, size,
con->v1.auth->authorizer_reply_buf);
if (ret <= 0)
goto out;
}
dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
con, con->v1.in_reply.tag,
le32_to_cpu(con->v1.in_reply.connect_seq),
le32_to_cpu(con->v1.in_reply.global_seq));
out:
return ret;
}
/*
* Verify the hello banner looks okay.
*/
static int verify_hello(struct ceph_connection *con)
{
if (memcmp(con->v1.in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
pr_err("connect to %s got bad banner\n",
ceph_pr_addr(&con->peer_addr));
con->error_msg = "protocol error, bad banner";
return -1;
}
return 0;
}
static int process_banner(struct ceph_connection *con)
{
struct ceph_entity_addr *my_addr = &con->msgr->inst.addr;
dout("process_banner on %p\n", con);
if (verify_hello(con) < 0)
return -1;
/*
* Make sure the other end is who we wanted. note that the other
* end may not yet know their ip address, so if it's 0.0.0.0, give
* them the benefit of the doubt.
*/
if (memcmp(&con->peer_addr, &con->v1.actual_peer_addr,
sizeof(con->peer_addr)) != 0 &&
!(ceph_addr_is_blank(&con->v1.actual_peer_addr) &&
con->v1.actual_peer_addr.nonce == con->peer_addr.nonce)) {
pr_warn("wrong peer, want %s/%u, got %s/%u\n",
ceph_pr_addr(&con->peer_addr),
le32_to_cpu(con->peer_addr.nonce),
ceph_pr_addr(&con->v1.actual_peer_addr),
le32_to_cpu(con->v1.actual_peer_addr.nonce));
con->error_msg = "wrong peer at address";
return -1;
}
/*
* did we learn our address?
*/
if (ceph_addr_is_blank(my_addr)) {
memcpy(&my_addr->in_addr,
&con->v1.peer_addr_for_me.in_addr,
sizeof(con->v1.peer_addr_for_me.in_addr));
ceph_addr_set_port(my_addr, 0);
ceph_encode_my_addr(con->msgr);
dout("process_banner learned my addr is %s\n",
ceph_pr_addr(my_addr));
}
return 0;
}
static int process_connect(struct ceph_connection *con)
{
u64 sup_feat = from_msgr(con->msgr)->supported_features;
u64 req_feat = from_msgr(con->msgr)->required_features;
u64 server_feat = le64_to_cpu(con->v1.in_reply.features);
int ret;
dout("process_connect on %p tag %d\n", con, con->v1.in_tag);
if (con->v1.auth) {
int len = le32_to_cpu(con->v1.in_reply.authorizer_len);
/*
* Any connection that defines ->get_authorizer()
* should also define ->add_authorizer_challenge() and
* ->verify_authorizer_reply().
*
* See get_connect_authorizer().
*/
if (con->v1.in_reply.tag ==
CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER) {
ret = con->ops->add_authorizer_challenge(
con, con->v1.auth->authorizer_reply_buf, len);
if (ret < 0)
return ret;
con_out_kvec_reset(con);
__prepare_write_connect(con);
prepare_read_connect(con);
return 0;
}
if (len) {
ret = con->ops->verify_authorizer_reply(con);
if (ret < 0) {
con->error_msg = "bad authorize reply";
return ret;
}
}
}
switch (con->v1.in_reply.tag) {
case CEPH_MSGR_TAG_FEATURES:
pr_err("%s%lld %s feature set mismatch,"
" my %llx < server's %llx, missing %llx\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr),
sup_feat, server_feat, server_feat & ~sup_feat);
con->error_msg = "missing required protocol features";
return -1;
case CEPH_MSGR_TAG_BADPROTOVER:
pr_err("%s%lld %s protocol version mismatch,"
" my %d != server's %d\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr),
le32_to_cpu(con->v1.out_connect.protocol_version),
le32_to_cpu(con->v1.in_reply.protocol_version));
con->error_msg = "protocol version mismatch";
return -1;
case CEPH_MSGR_TAG_BADAUTHORIZER:
con->v1.auth_retry++;
dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
con->v1.auth_retry);
if (con->v1.auth_retry == 2) {
con->error_msg = "connect authorization failure";
return -1;
}
con_out_kvec_reset(con);
ret = prepare_write_connect(con);
if (ret < 0)
return ret;
prepare_read_connect(con);
break;
case CEPH_MSGR_TAG_RESETSESSION:
/*
* If we connected with a large connect_seq but the peer
* has no record of a session with us (no connection, or
* connect_seq == 0), they will send RESETSESION to indicate
* that they must have reset their session, and may have
* dropped messages.
*/
dout("process_connect got RESET peer seq %u\n",
le32_to_cpu(con->v1.in_reply.connect_seq));
pr_info("%s%lld %s session reset\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr));
ceph_con_reset_session(con);
con_out_kvec_reset(con);
ret = prepare_write_connect(con);
if (ret < 0)
return ret;
prepare_read_connect(con);
/* Tell ceph about it. */
mutex_unlock(&con->mutex);
if (con->ops->peer_reset)
con->ops->peer_reset(con);
mutex_lock(&con->mutex);
if (con->state != CEPH_CON_S_V1_CONNECT_MSG)
return -EAGAIN;
break;
case CEPH_MSGR_TAG_RETRY_SESSION:
/*
* If we sent a smaller connect_seq than the peer has, try
* again with a larger value.
*/
dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
le32_to_cpu(con->v1.out_connect.connect_seq),
le32_to_cpu(con->v1.in_reply.connect_seq));
con->v1.connect_seq = le32_to_cpu(con->v1.in_reply.connect_seq);
con_out_kvec_reset(con);
ret = prepare_write_connect(con);
if (ret < 0)
return ret;
prepare_read_connect(con);
break;
case CEPH_MSGR_TAG_RETRY_GLOBAL:
/*
* If we sent a smaller global_seq than the peer has, try
* again with a larger value.
*/
dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
con->v1.peer_global_seq,
le32_to_cpu(con->v1.in_reply.global_seq));
ceph_get_global_seq(con->msgr,
le32_to_cpu(con->v1.in_reply.global_seq));
con_out_kvec_reset(con);
ret = prepare_write_connect(con);
if (ret < 0)
return ret;
prepare_read_connect(con);
break;
case CEPH_MSGR_TAG_SEQ:
case CEPH_MSGR_TAG_READY:
if (req_feat & ~server_feat) {
pr_err("%s%lld %s protocol feature mismatch,"
" my required %llx > server's %llx, need %llx\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr),
req_feat, server_feat, req_feat & ~server_feat);
con->error_msg = "missing required protocol features";
return -1;
}
WARN_ON(con->state != CEPH_CON_S_V1_CONNECT_MSG);
con->state = CEPH_CON_S_OPEN;
con->v1.auth_retry = 0; /* we authenticated; clear flag */
con->v1.peer_global_seq =
le32_to_cpu(con->v1.in_reply.global_seq);
con->v1.connect_seq++;
con->peer_features = server_feat;
dout("process_connect got READY gseq %d cseq %d (%d)\n",
con->v1.peer_global_seq,
le32_to_cpu(con->v1.in_reply.connect_seq),
con->v1.connect_seq);
WARN_ON(con->v1.connect_seq !=
le32_to_cpu(con->v1.in_reply.connect_seq));
if (con->v1.in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
ceph_con_flag_set(con, CEPH_CON_F_LOSSYTX);
con->delay = 0; /* reset backoff memory */
if (con->v1.in_reply.tag == CEPH_MSGR_TAG_SEQ) {
prepare_write_seq(con);
prepare_read_seq(con);
} else {
prepare_read_tag(con);
}
break;
case CEPH_MSGR_TAG_WAIT:
/*
* If there is a connection race (we are opening
* connections to each other), one of us may just have
* to WAIT. This shouldn't happen if we are the
* client.
*/
con->error_msg = "protocol error, got WAIT as client";
return -1;
default:
con->error_msg = "protocol error, garbage tag during connect";
return -1;
}
return 0;
}
/*
* read (part of) an ack
*/
static int read_partial_ack(struct ceph_connection *con)
{
int size = sizeof(con->v1.in_temp_ack);
int end = size;
return read_partial(con, end, size, &con->v1.in_temp_ack);
}
/*
* We can finally discard anything that's been acked.
*/
static void process_ack(struct ceph_connection *con)
{
u64 ack = le64_to_cpu(con->v1.in_temp_ack);
if (con->v1.in_tag == CEPH_MSGR_TAG_ACK)
ceph_con_discard_sent(con, ack);
else
ceph_con_discard_requeued(con, ack);
prepare_read_tag(con);
}
static int read_partial_message_section(struct ceph_connection *con,
struct kvec *section,
unsigned int sec_len, u32 *crc)
{
int ret, left;
BUG_ON(!section);
while (section->iov_len < sec_len) {
BUG_ON(section->iov_base == NULL);
left = sec_len - section->iov_len;
ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
section->iov_len, left);
if (ret <= 0)
return ret;
section->iov_len += ret;
}
if (section->iov_len == sec_len)
*crc = crc32c(0, section->iov_base, section->iov_len);
return 1;
}
static int read_partial_msg_data(struct ceph_connection *con)
{
struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
struct page *page;
size_t page_offset;
size_t length;
u32 crc = 0;
int ret;
if (do_datacrc)
crc = con->in_data_crc;
while (cursor->total_resid) {
if (!cursor->resid) {
ceph_msg_data_advance(cursor, 0);
continue;
}
page = ceph_msg_data_next(cursor, &page_offset, &length);
ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
if (ret <= 0) {
if (do_datacrc)
con->in_data_crc = crc;
return ret;
}
if (do_datacrc)
crc = ceph_crc32c_page(crc, page, page_offset, ret);
ceph_msg_data_advance(cursor, (size_t)ret);
}
if (do_datacrc)
con->in_data_crc = crc;
return 1; /* must return > 0 to indicate success */
}
static int read_partial_msg_data_bounce(struct ceph_connection *con)
{
struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
struct page *page;
size_t off, len;
u32 crc;
int ret;
if (unlikely(!con->bounce_page)) {
con->bounce_page = alloc_page(GFP_NOIO);
if (!con->bounce_page) {
pr_err("failed to allocate bounce page\n");
return -ENOMEM;
}
}
crc = con->in_data_crc;
while (cursor->total_resid) {
if (!cursor->resid) {
ceph_msg_data_advance(cursor, 0);
continue;
}
page = ceph_msg_data_next(cursor, &off, &len);
ret = ceph_tcp_recvpage(con->sock, con->bounce_page, 0, len);
if (ret <= 0) {
con->in_data_crc = crc;
return ret;
}
crc = crc32c(crc, page_address(con->bounce_page), ret);
memcpy_to_page(page, off, page_address(con->bounce_page), ret);
ceph_msg_data_advance(cursor, ret);
}
con->in_data_crc = crc;
return 1; /* must return > 0 to indicate success */
}
/*
* read (part of) a message.
*/
static int read_partial_message(struct ceph_connection *con)
{
struct ceph_msg *m = con->in_msg;
int size;
int end;
int ret;
unsigned int front_len, middle_len, data_len;
bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
u64 seq;
u32 crc;
dout("read_partial_message con %p msg %p\n", con, m);
/* header */
size = sizeof(con->v1.in_hdr);
end = size;
ret = read_partial(con, end, size, &con->v1.in_hdr);
if (ret <= 0)
return ret;
crc = crc32c(0, &con->v1.in_hdr, offsetof(struct ceph_msg_header, crc));
if (cpu_to_le32(crc) != con->v1.in_hdr.crc) {
pr_err("read_partial_message bad hdr crc %u != expected %u\n",
crc, con->v1.in_hdr.crc);
return -EBADMSG;
}
front_len = le32_to_cpu(con->v1.in_hdr.front_len);
if (front_len > CEPH_MSG_MAX_FRONT_LEN)
return -EIO;
middle_len = le32_to_cpu(con->v1.in_hdr.middle_len);
if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
return -EIO;
data_len = le32_to_cpu(con->v1.in_hdr.data_len);
if (data_len > CEPH_MSG_MAX_DATA_LEN)
return -EIO;
/* verify seq# */
seq = le64_to_cpu(con->v1.in_hdr.seq);
if ((s64)seq - (s64)con->in_seq < 1) {
pr_info("skipping %s%lld %s seq %lld expected %lld\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr),
seq, con->in_seq + 1);
con->v1.in_base_pos = -front_len - middle_len - data_len -
sizeof_footer(con);
con->v1.in_tag = CEPH_MSGR_TAG_READY;
return 1;
} else if ((s64)seq - (s64)con->in_seq > 1) {
pr_err("read_partial_message bad seq %lld expected %lld\n",
seq, con->in_seq + 1);
con->error_msg = "bad message sequence # for incoming message";
return -EBADE;
}
/* allocate message? */
if (!con->in_msg) {
int skip = 0;
dout("got hdr type %d front %d data %d\n", con->v1.in_hdr.type,
front_len, data_len);
ret = ceph_con_in_msg_alloc(con, &con->v1.in_hdr, &skip);
if (ret < 0)
return ret;
BUG_ON((!con->in_msg) ^ skip);
if (skip) {
/* skip this message */
dout("alloc_msg said skip message\n");
con->v1.in_base_pos = -front_len - middle_len -
data_len - sizeof_footer(con);
con->v1.in_tag = CEPH_MSGR_TAG_READY;
con->in_seq++;
return 1;
}
BUG_ON(!con->in_msg);
BUG_ON(con->in_msg->con != con);
m = con->in_msg;
m->front.iov_len = 0; /* haven't read it yet */
if (m->middle)
m->middle->vec.iov_len = 0;
/* prepare for data payload, if any */
if (data_len)
prepare_message_data(con->in_msg, data_len);
}
/* front */
ret = read_partial_message_section(con, &m->front, front_len,
&con->in_front_crc);
if (ret <= 0)
return ret;
/* middle */
if (m->middle) {
ret = read_partial_message_section(con, &m->middle->vec,
middle_len,
&con->in_middle_crc);
if (ret <= 0)
return ret;
}
/* (page) data */
if (data_len) {
if (!m->num_data_items)
return -EIO;
if (ceph_test_opt(from_msgr(con->msgr), RXBOUNCE))
ret = read_partial_msg_data_bounce(con);
else
ret = read_partial_msg_data(con);
if (ret <= 0)
return ret;
}
/* footer */
size = sizeof_footer(con);
end += size;
ret = read_partial(con, end, size, &m->footer);
if (ret <= 0)
return ret;
if (!need_sign) {
m->footer.flags = m->old_footer.flags;
m->footer.sig = 0;
}
dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
m, front_len, m->footer.front_crc, middle_len,
m->footer.middle_crc, data_len, m->footer.data_crc);
/* crc ok? */
if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
pr_err("read_partial_message %p front crc %u != exp. %u\n",
m, con->in_front_crc, m->footer.front_crc);
return -EBADMSG;
}
if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
pr_err("read_partial_message %p middle crc %u != exp %u\n",
m, con->in_middle_crc, m->footer.middle_crc);
return -EBADMSG;
}
if (do_datacrc &&
(m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
con->in_data_crc, le32_to_cpu(m->footer.data_crc));
return -EBADMSG;
}
if (need_sign && con->ops->check_message_signature &&
con->ops->check_message_signature(m)) {
pr_err("read_partial_message %p signature check failed\n", m);
return -EBADMSG;
}
return 1; /* done! */
}
static int read_keepalive_ack(struct ceph_connection *con)
{
struct ceph_timespec ceph_ts;
size_t size = sizeof(ceph_ts);
int ret = read_partial(con, size, size, &ceph_ts);
if (ret <= 0)
return ret;
ceph_decode_timespec64(&con->last_keepalive_ack, &ceph_ts);
prepare_read_tag(con);
return 1;
}
/*
* Read what we can from the socket.
*/
int ceph_con_v1_try_read(struct ceph_connection *con)
{
int ret = -1;
more:
dout("try_read start %p state %d\n", con, con->state);
if (con->state != CEPH_CON_S_V1_BANNER &&
con->state != CEPH_CON_S_V1_CONNECT_MSG &&
con->state != CEPH_CON_S_OPEN)
return 0;
BUG_ON(!con->sock);
dout("try_read tag %d in_base_pos %d\n", con->v1.in_tag,
con->v1.in_base_pos);
if (con->state == CEPH_CON_S_V1_BANNER) {
ret = read_partial_banner(con);
if (ret <= 0)
goto out;
ret = process_banner(con);
if (ret < 0)
goto out;
con->state = CEPH_CON_S_V1_CONNECT_MSG;
/*
* Received banner is good, exchange connection info.
* Do not reset out_kvec, as sending our banner raced
* with receiving peer banner after connect completed.
*/
ret = prepare_write_connect(con);
if (ret < 0)
goto out;
prepare_read_connect(con);
/* Send connection info before awaiting response */
goto out;
}
if (con->state == CEPH_CON_S_V1_CONNECT_MSG) {
ret = read_partial_connect(con);
if (ret <= 0)
goto out;
ret = process_connect(con);
if (ret < 0)
goto out;
goto more;
}
WARN_ON(con->state != CEPH_CON_S_OPEN);
if (con->v1.in_base_pos < 0) {
/*
* skipping + discarding content.
*/
ret = ceph_tcp_recvmsg(con->sock, NULL, -con->v1.in_base_pos);
if (ret <= 0)
goto out;
dout("skipped %d / %d bytes\n", ret, -con->v1.in_base_pos);
con->v1.in_base_pos += ret;
if (con->v1.in_base_pos)
goto more;
}
if (con->v1.in_tag == CEPH_MSGR_TAG_READY) {
/*
* what's next?
*/
ret = ceph_tcp_recvmsg(con->sock, &con->v1.in_tag, 1);
if (ret <= 0)
goto out;
dout("try_read got tag %d\n", con->v1.in_tag);
switch (con->v1.in_tag) {
case CEPH_MSGR_TAG_MSG:
prepare_read_message(con);
break;
case CEPH_MSGR_TAG_ACK:
prepare_read_ack(con);
break;
case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
prepare_read_keepalive_ack(con);
break;
case CEPH_MSGR_TAG_CLOSE:
ceph_con_close_socket(con);
con->state = CEPH_CON_S_CLOSED;
goto out;
default:
goto bad_tag;
}
}
if (con->v1.in_tag == CEPH_MSGR_TAG_MSG) {
ret = read_partial_message(con);
if (ret <= 0) {
switch (ret) {
case -EBADMSG:
con->error_msg = "bad crc/signature";
fallthrough;
case -EBADE:
ret = -EIO;
break;
case -EIO:
con->error_msg = "io error";
break;
}
goto out;
}
if (con->v1.in_tag == CEPH_MSGR_TAG_READY)
goto more;
ceph_con_process_message(con);
if (con->state == CEPH_CON_S_OPEN)
prepare_read_tag(con);
goto more;
}
if (con->v1.in_tag == CEPH_MSGR_TAG_ACK ||
con->v1.in_tag == CEPH_MSGR_TAG_SEQ) {
/*
* the final handshake seq exchange is semantically
* equivalent to an ACK
*/
ret = read_partial_ack(con);
if (ret <= 0)
goto out;
process_ack(con);
goto more;
}
if (con->v1.in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
ret = read_keepalive_ack(con);
if (ret <= 0)
goto out;
goto more;
}
out:
dout("try_read done on %p ret %d\n", con, ret);
return ret;
bad_tag:
pr_err("try_read bad tag %d\n", con->v1.in_tag);
con->error_msg = "protocol error, garbage tag";
ret = -1;
goto out;
}
/*
* Write something to the socket. Called in a worker thread when the
* socket appears to be writeable and we have something ready to send.
*/
int ceph_con_v1_try_write(struct ceph_connection *con)
{
int ret = 1;
dout("try_write start %p state %d\n", con, con->state);
if (con->state != CEPH_CON_S_PREOPEN &&
con->state != CEPH_CON_S_V1_BANNER &&
con->state != CEPH_CON_S_V1_CONNECT_MSG &&
con->state != CEPH_CON_S_OPEN)
return 0;
/* open the socket first? */
if (con->state == CEPH_CON_S_PREOPEN) {
BUG_ON(con->sock);
con->state = CEPH_CON_S_V1_BANNER;
con_out_kvec_reset(con);
prepare_write_banner(con);
prepare_read_banner(con);
BUG_ON(con->in_msg);
con->v1.in_tag = CEPH_MSGR_TAG_READY;
dout("try_write initiating connect on %p new state %d\n",
con, con->state);
ret = ceph_tcp_connect(con);
if (ret < 0) {
con->error_msg = "connect error";
goto out;
}
}
more:
dout("try_write out_kvec_bytes %d\n", con->v1.out_kvec_bytes);
BUG_ON(!con->sock);
/* kvec data queued? */
if (con->v1.out_kvec_left) {
ret = write_partial_kvec(con);
if (ret <= 0)
goto out;
}
if (con->v1.out_skip) {
ret = write_partial_skip(con);
if (ret <= 0)
goto out;
}
/* msg pages? */
if (con->out_msg) {
if (con->v1.out_msg_done) {
ceph_msg_put(con->out_msg);
con->out_msg = NULL; /* we're done with this one */
goto do_next;
}
ret = write_partial_message_data(con);
if (ret == 1)
goto more; /* we need to send the footer, too! */
if (ret == 0)
goto out;
if (ret < 0) {
dout("try_write write_partial_message_data err %d\n",
ret);
goto out;
}
}
do_next:
if (con->state == CEPH_CON_S_OPEN) {
if (ceph_con_flag_test_and_clear(con,
CEPH_CON_F_KEEPALIVE_PENDING)) {
prepare_write_keepalive(con);
goto more;
}
/* is anything else pending? */
if (!list_empty(&con->out_queue)) {
prepare_write_message(con);
goto more;
}
if (con->in_seq > con->in_seq_acked) {
prepare_write_ack(con);
goto more;
}
}
/* Nothing to do! */
ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING);
dout("try_write nothing else to write.\n");
ret = 0;
out:
dout("try_write done on %p ret %d\n", con, ret);
return ret;
}
void ceph_con_v1_revoke(struct ceph_connection *con)
{
struct ceph_msg *msg = con->out_msg;
WARN_ON(con->v1.out_skip);
/* footer */
if (con->v1.out_msg_done) {
con->v1.out_skip += con_out_kvec_skip(con);
} else {
WARN_ON(!msg->data_length);
con->v1.out_skip += sizeof_footer(con);
}
/* data, middle, front */
if (msg->data_length)
con->v1.out_skip += msg->cursor.total_resid;
if (msg->middle)
con->v1.out_skip += con_out_kvec_skip(con);
con->v1.out_skip += con_out_kvec_skip(con);
dout("%s con %p out_kvec_bytes %d out_skip %d\n", __func__, con,
con->v1.out_kvec_bytes, con->v1.out_skip);
}
void ceph_con_v1_revoke_incoming(struct ceph_connection *con)
{
unsigned int front_len = le32_to_cpu(con->v1.in_hdr.front_len);
unsigned int middle_len = le32_to_cpu(con->v1.in_hdr.middle_len);
unsigned int data_len = le32_to_cpu(con->v1.in_hdr.data_len);
/* skip rest of message */
con->v1.in_base_pos = con->v1.in_base_pos -
sizeof(struct ceph_msg_header) -
front_len -
middle_len -
data_len -
sizeof(struct ceph_msg_footer);
con->v1.in_tag = CEPH_MSGR_TAG_READY;
con->in_seq++;
dout("%s con %p in_base_pos %d\n", __func__, con, con->v1.in_base_pos);
}
bool ceph_con_v1_opened(struct ceph_connection *con)
{
return con->v1.connect_seq;
}
void ceph_con_v1_reset_session(struct ceph_connection *con)
{
con->v1.connect_seq = 0;
con->v1.peer_global_seq = 0;
}
void ceph_con_v1_reset_protocol(struct ceph_connection *con)
{
con->v1.out_skip = 0;
}