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![David Howells](/assets/img/avatar_default.png)
Fix the mishandling of MSG_DONTWAIT and also reinstates the per-page checking of the source pages (which might have come from a DIO write by userspace) by partially reverting the changes to support MSG_SPLICE_PAGES and doing things a little differently. In messenger_v1: (1) The ceph_tcp_sendpage() is resurrected and the callers reverted to use that. (2) The callers now pass MSG_MORE unconditionally. Previously, they were passing in MSG_MORE|MSG_SENDPAGE_NOTLAST and then degrading that to just MSG_MORE on the last call to ->sendpage(). (3) Make ceph_tcp_sendpage() a wrapper around sendmsg() rather than sendpage(), setting MSG_SPLICE_PAGES if sendpage_ok() returns true on the page. In messenger_v2: (4) Bring back do_try_sendpage() and make the callers use that. (5) Make do_try_sendpage() use sendmsg() for both cases and set MSG_SPLICE_PAGES if sendpage_ok() is set. Fixes:40a8c17aa7
("ceph: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage") Fixes:fa094ccae1
("ceph: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage()") Reported-by: Ilya Dryomov <idryomov@gmail.com> Link: https://lore.kernel.org/r/CAOi1vP9vjLfk3W+AJFeexC93jqPaPUn2dD_4NrzxwoZTbYfOnw@mail.gmail.com/ Link: https://lore.kernel.org/r/CAOi1vP_Bn918j24S94MuGyn+Gxk212btw7yWeDrRcW1U8pc_BA@mail.gmail.com/ Signed-off-by: David Howells <dhowells@redhat.com> cc: Xiubo Li <xiubli@redhat.com> cc: Jeff Layton <jlayton@kernel.org> cc: Jens Axboe <axboe@kernel.dk> cc: Matthew Wilcox <willy@infradead.org> Link: https://lore.kernel.org/r/3101881.1687801973@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/3111635.1687813501@warthog.procyon.org.uk/ # v2 Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Link: https://lore.kernel.org/r/3199652.1687873788@warthog.procyon.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1541 lines
39 KiB
C
1541 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ceph/ceph_debug.h>
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#include <linux/bvec.h>
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#include <linux/crc32c.h>
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#include <linux/net.h>
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#include <linux/socket.h>
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#include <net/sock.h>
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#include <linux/ceph/ceph_features.h>
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#include <linux/ceph/decode.h>
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#include <linux/ceph/libceph.h>
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#include <linux/ceph/messenger.h>
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/* static tag bytes (protocol control messages) */
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static char tag_msg = CEPH_MSGR_TAG_MSG;
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static char tag_ack = CEPH_MSGR_TAG_ACK;
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static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
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static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2;
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/*
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* If @buf is NULL, discard up to @len bytes.
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*/
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static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
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{
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struct kvec iov = {buf, len};
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struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
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int r;
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if (!buf)
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msg.msg_flags |= MSG_TRUNC;
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iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, len);
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r = sock_recvmsg(sock, &msg, msg.msg_flags);
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if (r == -EAGAIN)
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r = 0;
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return r;
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}
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static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
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int page_offset, size_t length)
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{
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struct bio_vec bvec;
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struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
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int r;
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BUG_ON(page_offset + length > PAGE_SIZE);
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bvec_set_page(&bvec, page, length, page_offset);
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iov_iter_bvec(&msg.msg_iter, ITER_DEST, &bvec, 1, length);
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r = sock_recvmsg(sock, &msg, msg.msg_flags);
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if (r == -EAGAIN)
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r = 0;
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return r;
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}
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/*
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* write something. @more is true if caller will be sending more data
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* shortly.
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*/
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static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
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size_t kvlen, size_t len, bool more)
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{
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struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
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int r;
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if (more)
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msg.msg_flags |= MSG_MORE;
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else
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msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
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r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
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if (r == -EAGAIN)
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r = 0;
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return r;
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}
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/*
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* @more: MSG_MORE or 0.
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*/
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static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
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int offset, size_t size, int more)
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{
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struct msghdr msg = {
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.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL | more,
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};
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struct bio_vec bvec;
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int ret;
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/*
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* MSG_SPLICE_PAGES cannot properly handle pages with page_count == 0,
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* we need to fall back to sendmsg if that's the case.
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*
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* Same goes for slab pages: skb_can_coalesce() allows
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* coalescing neighboring slab objects into a single frag which
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* triggers one of hardened usercopy checks.
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*/
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if (sendpage_ok(page))
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msg.msg_flags |= MSG_SPLICE_PAGES;
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bvec_set_page(&bvec, page, size, offset);
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iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
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ret = sock_sendmsg(sock, &msg);
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if (ret == -EAGAIN)
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ret = 0;
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return ret;
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}
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static void con_out_kvec_reset(struct ceph_connection *con)
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{
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BUG_ON(con->v1.out_skip);
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con->v1.out_kvec_left = 0;
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con->v1.out_kvec_bytes = 0;
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con->v1.out_kvec_cur = &con->v1.out_kvec[0];
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}
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static void con_out_kvec_add(struct ceph_connection *con,
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size_t size, void *data)
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{
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int index = con->v1.out_kvec_left;
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BUG_ON(con->v1.out_skip);
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BUG_ON(index >= ARRAY_SIZE(con->v1.out_kvec));
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con->v1.out_kvec[index].iov_len = size;
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con->v1.out_kvec[index].iov_base = data;
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con->v1.out_kvec_left++;
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con->v1.out_kvec_bytes += size;
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}
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/*
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* Chop off a kvec from the end. Return residual number of bytes for
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* that kvec, i.e. how many bytes would have been written if the kvec
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* hadn't been nuked.
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*/
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static int con_out_kvec_skip(struct ceph_connection *con)
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{
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int skip = 0;
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if (con->v1.out_kvec_bytes > 0) {
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skip = con->v1.out_kvec_cur[con->v1.out_kvec_left - 1].iov_len;
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BUG_ON(con->v1.out_kvec_bytes < skip);
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BUG_ON(!con->v1.out_kvec_left);
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con->v1.out_kvec_bytes -= skip;
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con->v1.out_kvec_left--;
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}
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return skip;
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}
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static size_t sizeof_footer(struct ceph_connection *con)
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{
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return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ?
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sizeof(struct ceph_msg_footer) :
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sizeof(struct ceph_msg_footer_old);
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}
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static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
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{
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/* Initialize data cursor */
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ceph_msg_data_cursor_init(&msg->cursor, msg, data_len);
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}
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/*
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* Prepare footer for currently outgoing message, and finish things
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* off. Assumes out_kvec* are already valid.. we just add on to the end.
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*/
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static void prepare_write_message_footer(struct ceph_connection *con)
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{
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struct ceph_msg *m = con->out_msg;
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m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
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dout("prepare_write_message_footer %p\n", con);
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con_out_kvec_add(con, sizeof_footer(con), &m->footer);
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if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
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if (con->ops->sign_message)
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con->ops->sign_message(m);
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else
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m->footer.sig = 0;
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} else {
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m->old_footer.flags = m->footer.flags;
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}
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con->v1.out_more = m->more_to_follow;
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con->v1.out_msg_done = true;
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}
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/*
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* Prepare headers for the next outgoing message.
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*/
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static void prepare_write_message(struct ceph_connection *con)
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{
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struct ceph_msg *m;
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u32 crc;
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con_out_kvec_reset(con);
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con->v1.out_msg_done = false;
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/* Sneak an ack in there first? If we can get it into the same
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* TCP packet that's a good thing. */
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if (con->in_seq > con->in_seq_acked) {
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con->in_seq_acked = con->in_seq;
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con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
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con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
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con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
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&con->v1.out_temp_ack);
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}
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ceph_con_get_out_msg(con);
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m = con->out_msg;
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dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
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m, con->out_seq, le16_to_cpu(m->hdr.type),
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le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
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m->data_length);
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WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len));
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WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
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/* tag + hdr + front + middle */
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con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
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con_out_kvec_add(con, sizeof(con->v1.out_hdr), &con->v1.out_hdr);
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con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
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if (m->middle)
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con_out_kvec_add(con, m->middle->vec.iov_len,
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m->middle->vec.iov_base);
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/* fill in hdr crc and finalize hdr */
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crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
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con->out_msg->hdr.crc = cpu_to_le32(crc);
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memcpy(&con->v1.out_hdr, &con->out_msg->hdr, sizeof(con->v1.out_hdr));
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/* fill in front and middle crc, footer */
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crc = crc32c(0, m->front.iov_base, m->front.iov_len);
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con->out_msg->footer.front_crc = cpu_to_le32(crc);
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if (m->middle) {
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crc = crc32c(0, m->middle->vec.iov_base,
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m->middle->vec.iov_len);
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con->out_msg->footer.middle_crc = cpu_to_le32(crc);
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} else
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con->out_msg->footer.middle_crc = 0;
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dout("%s front_crc %u middle_crc %u\n", __func__,
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le32_to_cpu(con->out_msg->footer.front_crc),
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le32_to_cpu(con->out_msg->footer.middle_crc));
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con->out_msg->footer.flags = 0;
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/* is there a data payload? */
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con->out_msg->footer.data_crc = 0;
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if (m->data_length) {
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prepare_message_data(con->out_msg, m->data_length);
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con->v1.out_more = 1; /* data + footer will follow */
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} else {
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/* no, queue up footer too and be done */
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prepare_write_message_footer(con);
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}
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ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
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}
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/*
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* Prepare an ack.
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*/
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static void prepare_write_ack(struct ceph_connection *con)
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{
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dout("prepare_write_ack %p %llu -> %llu\n", con,
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con->in_seq_acked, con->in_seq);
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con->in_seq_acked = con->in_seq;
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con_out_kvec_reset(con);
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con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
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con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
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con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
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&con->v1.out_temp_ack);
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con->v1.out_more = 1; /* more will follow.. eventually.. */
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ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
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}
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/*
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* Prepare to share the seq during handshake
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*/
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static void prepare_write_seq(struct ceph_connection *con)
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{
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dout("prepare_write_seq %p %llu -> %llu\n", con,
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con->in_seq_acked, con->in_seq);
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con->in_seq_acked = con->in_seq;
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con_out_kvec_reset(con);
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con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
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con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
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&con->v1.out_temp_ack);
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ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
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}
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/*
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* Prepare to write keepalive byte.
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*/
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static void prepare_write_keepalive(struct ceph_connection *con)
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{
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dout("prepare_write_keepalive %p\n", con);
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con_out_kvec_reset(con);
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if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
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struct timespec64 now;
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ktime_get_real_ts64(&now);
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con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
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ceph_encode_timespec64(&con->v1.out_temp_keepalive2, &now);
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con_out_kvec_add(con, sizeof(con->v1.out_temp_keepalive2),
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&con->v1.out_temp_keepalive2);
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} else {
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con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
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}
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ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
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}
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/*
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* Connection negotiation.
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*/
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static int get_connect_authorizer(struct ceph_connection *con)
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{
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struct ceph_auth_handshake *auth;
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int auth_proto;
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if (!con->ops->get_authorizer) {
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con->v1.auth = NULL;
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con->v1.out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
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con->v1.out_connect.authorizer_len = 0;
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return 0;
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}
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auth = con->ops->get_authorizer(con, &auth_proto, con->v1.auth_retry);
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if (IS_ERR(auth))
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return PTR_ERR(auth);
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con->v1.auth = auth;
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con->v1.out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
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con->v1.out_connect.authorizer_len =
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cpu_to_le32(auth->authorizer_buf_len);
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return 0;
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}
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/*
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* We connected to a peer and are saying hello.
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*/
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static void prepare_write_banner(struct ceph_connection *con)
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{
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con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
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con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
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&con->msgr->my_enc_addr);
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con->v1.out_more = 0;
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ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
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}
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static void __prepare_write_connect(struct ceph_connection *con)
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{
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con_out_kvec_add(con, sizeof(con->v1.out_connect),
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&con->v1.out_connect);
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if (con->v1.auth)
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con_out_kvec_add(con, con->v1.auth->authorizer_buf_len,
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con->v1.auth->authorizer_buf);
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con->v1.out_more = 0;
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ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
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}
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static int prepare_write_connect(struct ceph_connection *con)
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{
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unsigned int global_seq = ceph_get_global_seq(con->msgr, 0);
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int proto;
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int ret;
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switch (con->peer_name.type) {
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case CEPH_ENTITY_TYPE_MON:
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proto = CEPH_MONC_PROTOCOL;
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break;
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case CEPH_ENTITY_TYPE_OSD:
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proto = CEPH_OSDC_PROTOCOL;
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break;
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case CEPH_ENTITY_TYPE_MDS:
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proto = CEPH_MDSC_PROTOCOL;
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break;
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default:
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BUG();
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}
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dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
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con->v1.connect_seq, global_seq, proto);
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con->v1.out_connect.features =
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cpu_to_le64(from_msgr(con->msgr)->supported_features);
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con->v1.out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
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con->v1.out_connect.connect_seq = cpu_to_le32(con->v1.connect_seq);
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con->v1.out_connect.global_seq = cpu_to_le32(global_seq);
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con->v1.out_connect.protocol_version = cpu_to_le32(proto);
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con->v1.out_connect.flags = 0;
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ret = get_connect_authorizer(con);
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if (ret)
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return ret;
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__prepare_write_connect(con);
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return 0;
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}
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/*
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* write as much of pending kvecs to the socket as we can.
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* 1 -> done
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* 0 -> socket full, but more to do
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* <0 -> error
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*/
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static int write_partial_kvec(struct ceph_connection *con)
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|
{
|
|
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_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;
|
|
}
|