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messenger_v1.c
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// 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;
struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
int r;
BUG_ON(page_offset + length > PAGE_SIZE);
bvec_set_page(&bvec, page, length, page_offset);
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: MSG_MORE or 0.
*/
static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
int offset, size_t size, int more)
{
struct msghdr msg = {
.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL | more,
};
struct bio_vec bvec;
int ret;
/*
* MSG_SPLICE_PAGES 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))
msg.msg_flags |= MSG_SPLICE_PAGES;
bvec_set_page(&bvec, page, size, offset);
iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
ret = sock_sendmsg(sock, &msg);
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 if it's not a sparse read */
u64 len = msg->sparse_read_total ? : data_len;
ceph_msg_data_cursor_init(&msg->cursor, msg, 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);
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);
ret = ceph_tcp_sendpage(con->sock, page, page_offset, length,
MSG_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 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);
ret = ceph_tcp_sendpage(con->sock, ceph_zero_page, 0, size,
MSG_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_chunk(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(*crc, section->iov_base, section->iov_len);
return 1;
}
static inline int read_partial_message_section(struct ceph_connection *con,
struct kvec *section,
unsigned int sec_len, u32 *crc)
{
*crc = 0;
return read_partial_message_chunk(con, section, sec_len, crc);
}
static int read_partial_sparse_msg_extent(struct ceph_connection *con, u32 *crc)
{
struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
bool do_bounce = ceph_test_opt(from_msgr(con->msgr), RXBOUNCE);
if (do_bounce && unlikely(!con->bounce_page)) {