916c61a5ed
PRUS_NOTREADY indicates that the caller has not yet populated the chain with data, and so it is not ready for transmission. This is used by sendfile (for async I/O) and KTLS (for encryption). In particular, if pru_send returns an error, the caller is responsible for freeing the chain since other implicit references to the data buffers exist. For async sendfile, it happens that an error will only be returned if the connection was dropped, in which case tcp_usr_ready() will handle freeing the chain. But since KTLS can be used in conjunction with the regular socket I/O system calls, many more error cases - which do not result in the connection being dropped - are reachable. In these cases, KTLS was effectively assuming success. So: - Change sosend_generic() to free the mbuf chain if pru_send(PRUS_NOTREADY) fails. Nothing else owns a reference to the chain at that point. - Similarly, in vn_sendfile() change the !async I/O && KTLS case to free the chain. - If async I/O is still outstanding when pru_send fails in vn_sendfile(), set an error in the sfio structure so that the connection is aborted and the mbuf chain is freed. Reviewed by: gallatin, tuexen Discussed with: jhb MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D30349
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| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Various commands and libraries under the Common Development and Distribution License. |
| contrib | Packages contributed by 3rd parties. |
| crypto | Cryptography stuff (see crypto/README). |
| etc | Template files for /etc. |
| gnu | Various commands and libraries under the GNU Public License. Please see gnu/COPYING and gnu/COPYING.LIB for more information. |
| include | System include files. |
| kerberos5 | Kerberos5 (Heimdal) package. |
| lib | System libraries. |
| libexec | System daemons. |
| release | Release building Makefile & associated tools. |
| rescue | Build system for statically linked /rescue utilities. |
| sbin | System commands. |
| secure | Cryptographic libraries and commands. |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources. |
sys/arch/conf |
Kernel configuration files. GENERIC is the configuration used in release builds. NOTES contains documentation of all possible entries. |
| tests | Regression tests which can be run by Kyua. See tests/README for additional information. |
| tools | Utilities for regression testing and miscellaneous tasks. |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
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