diff options
Diffstat (limited to 'mtu.h')
| -rw-r--r-- | mtu.h | 68 |
1 files changed, 36 insertions, 32 deletions
@@ -86,39 +86,43 @@ */ #define PAYLOAD_ALIGN 4 -struct frame { - /* - * Maximum datagram size to be sent over the tunnel TCP/UDP channel. - */ - int link_mtu; - int link_mtu_dynamic; - - /* - * How many extra bytes might each subsystem (crypto, TLS, or, compression) - * add to frame in worst case? - * - * mtu + extra_frame = MTU of TCP/UDP transport - */ - int extra_frame; - - /* - * Worst case size added to internal buffer due to functions - * such as compression which can potentially expand the size of uncompressible - * data. - */ - int extra_buffer; - - /* - * Max number of bytes in excess of tun mtu size that we might read - * or write from TUN/TAP device. - */ - int extra_tun; - /* - * Max number of bytes in excess of link mtu size that we might read - * or write from UDP/TCP link. - */ - int extra_link; +/**************************************************************************/ +/** + * Packet geometry parameters. + */ +struct frame { + int link_mtu; /**< Maximum packet size to be sent over + * the external network interface. */ + + int link_mtu_dynamic; /**< Dynamic MTU value for the external + * network interface. */ + + int extra_frame; /**< Maximum number of bytes that all + * processing steps together could add. + * @code + * frame.link_mtu = "socket MTU" - extra_frame; + * @endcode + */ + + int extra_buffer; /**< Maximum number of bytes that + * processing steps could expand the + * internal work buffer. + * + * This is used by the \link compression + * Data Channel Compression + * module\endlink to give enough working + * space for worst-case expansion of + * incompressible content. */ + + int extra_tun; /**< Maximum number of bytes in excess of + * the tun/tap MTU that might be read + * from or written to the virtual + * tun/tap network interface. */ + + int extra_link; /**< Maximum number of bytes in excess of + * external network interface's MTU that + * might be read from or written to it. */ /* * Alignment control |