mirror of https://github.com/aya-rs/aya
book: redirect to aya-rs.dev/book
Alessandro Decina
2 years ago
parent
026a987afa
commit
ecb327f7ed
@ -1,167 +0,0 @@
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||||
<!DOCTYPE HTML>
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||||
<html lang="en" class="sidebar-visible no-js light">
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<head>
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||||
<!-- Book generated using mdBook -->
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<meta charset="UTF-8">
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<title></title>
|
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<base href="/">
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<!-- Custom HTML head -->
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<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
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<meta name="description" content="">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="theme-color" content="#ffffff" />
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<link rel="icon" href="favicon.svg">
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<link rel="shortcut icon" href="favicon.png">
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<link rel="stylesheet" href="css/variables.css">
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<link rel="stylesheet" href="css/general.css">
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<link rel="stylesheet" href="css/chrome.css">
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<link rel="stylesheet" href="css/print.css" media="print">
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<!-- Fonts -->
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<link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
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<link rel="stylesheet" href="fonts/fonts.css">
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<!-- Highlight.js Stylesheets -->
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||||
<link rel="stylesheet" href="highlight.css">
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<link rel="stylesheet" href="tomorrow-night.css">
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<link rel="stylesheet" href="ayu-highlight.css">
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||||
<!-- Custom theme stylesheets -->
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||||
</head>
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||||
<body>
|
||||
<!-- Provide site root to javascript -->
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||||
<script type="text/javascript">
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||||
var path_to_root = "";
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var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
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</script>
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<script type="text/javascript">
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try {
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var theme = localStorage.getItem('mdbook-theme');
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localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
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</script>
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<!-- Set the theme before any content is loaded, prevents flash -->
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<script type="text/javascript">
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try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
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if (theme === null || theme === undefined) { theme = default_theme; }
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var html = document.querySelector('html');
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html.classList.remove('no-js')
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html.classList.remove('light')
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html.classList.add(theme);
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html.classList.add('js');
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</script>
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<!-- Hide / unhide sidebar before it is displayed -->
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<script type="text/javascript">
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var html = document.querySelector('html');
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var sidebar = 'hidden';
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if (document.body.clientWidth >= 1080) {
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try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
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sidebar = sidebar || 'visible';
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}
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html.classList.remove('sidebar-visible');
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html.classList.add("sidebar-" + sidebar);
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</script>
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||||
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
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||||
<div class="sidebar-scrollbox">
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||||
<ol class="chapter"><li class="chapter-item expanded "><a href="intro/index.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="ebpf/index.html"><strong aria-hidden="true">2.</strong> eBPF Program Limitiations</a></li><li class="chapter-item expanded "><a href="start/index.html"><strong aria-hidden="true">3.</strong> Getting Started</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="start/development.html"><strong aria-hidden="true">3.1.</strong> Development Environment</a></li><li class="chapter-item expanded "><a href="start/hello-xdp.html"><strong aria-hidden="true">3.2.</strong> Hello XDP!</a></li><li class="chapter-item expanded "><a href="start/logging-packets.html"><strong aria-hidden="true">3.3.</strong> Logging Packets</a></li></ol></li></ol>
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<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
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<div class="page">
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<div id="menu-bar-hover-placeholder"></div>
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<div id="menu-bar" class="menu-bar sticky bordered">
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<div class="left-buttons">
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<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
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<i class="fa fa-bars"></i>
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</button>
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<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
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<i class="fa fa-paint-brush"></i>
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</button>
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<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
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<li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li>
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<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
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<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
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<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
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</ul>
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<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
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<i class="fa fa-search"></i>
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</button>
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</div>
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<h1 class="menu-title">Building eBPF Programs With Aya</h1>
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<div class="right-buttons">
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<a href="print.html" title="Print this book" aria-label="Print this book">
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<i id="print-button" class="fa fa-print"></i>
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</a>
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</div>
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</div>
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<div id="search-wrapper" class="hidden">
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<form id="searchbar-outer" class="searchbar-outer">
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<input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
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</form>
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<div id="searchresults-outer" class="searchresults-outer hidden">
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<div id="searchresults-header" class="searchresults-header"></div>
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<ul id="searchresults">
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</ul>
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</div>
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</div>
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<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
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<script type="text/javascript">
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document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
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document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
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||||
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
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link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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});
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</script>
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||||
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||||
<div id="content" class="content">
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||||
<main>
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<h1 id="document-not-found-404"><a class="header" href="#document-not-found-404">Document not found (404)</a></h1>
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<p>This URL is invalid, sorry. Please use the navigation bar or search to continue.</p>
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</main>
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<nav class="nav-wrapper" aria-label="Page navigation">
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<!-- Mobile navigation buttons -->
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<div style="clear: both"></div>
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</nav>
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</div>
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</div>
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<nav class="nav-wide-wrapper" aria-label="Page navigation">
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</nav>
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</div>
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<script type="text/javascript">
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window.playground_copyable = true;
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</script>
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<script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
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<script src="mark.min.js" type="text/javascript" charset="utf-8"></script>
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<script src="searcher.js" type="text/javascript" charset="utf-8"></script>
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<script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script>
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<script src="highlight.js" type="text/javascript" charset="utf-8"></script>
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<script src="book.js" type="text/javascript" charset="utf-8"></script>
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<!-- Custom JS scripts -->
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</body>
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</html>
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@ -1,79 +0,0 @@
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/*
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Based off of the Ayu theme
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||||
Original by Dempfi (https://github.com/dempfi/ayu)
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*/
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||||
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||||
.hljs {
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display: block;
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overflow-x: auto;
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background: #191f26;
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color: #e6e1cf;
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padding: 0.5em;
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}
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.hljs-comment,
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.hljs-quote {
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color: #5c6773;
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font-style: italic;
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}
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.hljs-variable,
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.hljs-template-variable,
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.hljs-attribute,
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.hljs-attr,
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.hljs-regexp,
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.hljs-link,
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.hljs-selector-id,
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.hljs-selector-class {
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color: #ff7733;
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}
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.hljs-number,
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.hljs-meta,
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.hljs-builtin-name,
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.hljs-literal,
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.hljs-type,
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.hljs-params {
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color: #ffee99;
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}
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.hljs-string,
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color: #b8cc52;
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}
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.hljs-title,
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.hljs-built_in,
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.hljs-section {
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color: #ffb454;
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}
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.hljs-keyword,
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.hljs-selector-tag,
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.hljs-symbol {
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color: #ff7733;
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}
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.hljs-name {
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color: #36a3d9;
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}
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.hljs-tag {
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color: #00568d;
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.hljs-emphasis {
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font-style: italic;
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font-weight: bold;
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color: #91b362;
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.hljs-deletion {
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color: #d96c75;
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}
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||||
@ -1,672 +0,0 @@
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"use strict";
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||||
|
||||
// Fix back button cache problem
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||||
window.onunload = function () { };
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||||
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||||
// Global variable, shared between modules
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||||
function playground_text(playground) {
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let code_block = playground.querySelector("code");
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||||
|
||||
if (window.ace && code_block.classList.contains("editable")) {
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let editor = window.ace.edit(code_block);
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||||
return editor.getValue();
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||||
} else {
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||||
return code_block.textContent;
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||||
}
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||||
}
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||||
|
||||
(function codeSnippets() {
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function fetch_with_timeout(url, options, timeout = 6000) {
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||||
return Promise.race([
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||||
fetch(url, options),
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||||
new Promise((_, reject) => setTimeout(() => reject(new Error('timeout')), timeout))
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||||
]);
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||||
}
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||||
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||||
var playgrounds = Array.from(document.querySelectorAll(".playground"));
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||||
if (playgrounds.length > 0) {
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fetch_with_timeout("https://play.rust-lang.org/meta/crates", {
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headers: {
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'Content-Type': "application/json",
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||||
},
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||||
method: 'POST',
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||||
mode: 'cors',
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||||
})
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||||
.then(response => response.json())
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||||
.then(response => {
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||||
// get list of crates available in the rust playground
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let playground_crates = response.crates.map(item => item["id"]);
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playgrounds.forEach(block => handle_crate_list_update(block, playground_crates));
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});
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||||
}
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||||
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||||
function handle_crate_list_update(playground_block, playground_crates) {
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// update the play buttons after receiving the response
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||||
update_play_button(playground_block, playground_crates);
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||||
|
||||
// and install on change listener to dynamically update ACE editors
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||||
if (window.ace) {
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||||
let code_block = playground_block.querySelector("code");
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||||
if (code_block.classList.contains("editable")) {
|
||||
let editor = window.ace.edit(code_block);
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||||
editor.addEventListener("change", function (e) {
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||||
update_play_button(playground_block, playground_crates);
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||||
});
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||||
// add Ctrl-Enter command to execute rust code
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||||
editor.commands.addCommand({
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||||
name: "run",
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bindKey: {
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win: "Ctrl-Enter",
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mac: "Ctrl-Enter"
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},
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exec: _editor => run_rust_code(playground_block)
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||||
});
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||||
}
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||||
}
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||||
}
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||||
|
||||
// updates the visibility of play button based on `no_run` class and
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// used crates vs ones available on http://play.rust-lang.org
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function update_play_button(pre_block, playground_crates) {
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var play_button = pre_block.querySelector(".play-button");
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||||
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||||
// skip if code is `no_run`
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if (pre_block.querySelector('code').classList.contains("no_run")) {
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play_button.classList.add("hidden");
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return;
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||||
}
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||||
|
||||
// get list of `extern crate`'s from snippet
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||||
var txt = playground_text(pre_block);
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var re = /extern\s+crate\s+([a-zA-Z_0-9]+)\s*;/g;
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var snippet_crates = [];
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var item;
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while (item = re.exec(txt)) {
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snippet_crates.push(item[1]);
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}
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||||
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||||
// check if all used crates are available on play.rust-lang.org
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var all_available = snippet_crates.every(function (elem) {
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return playground_crates.indexOf(elem) > -1;
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||||
});
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||||
|
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if (all_available) {
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||||
play_button.classList.remove("hidden");
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} else {
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play_button.classList.add("hidden");
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}
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}
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||||
function run_rust_code(code_block) {
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var result_block = code_block.querySelector(".result");
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if (!result_block) {
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result_block = document.createElement('code');
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||||
result_block.className = 'result hljs language-bash';
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code_block.append(result_block);
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}
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||||
|
||||
let text = playground_text(code_block);
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||||
let classes = code_block.querySelector('code').classList;
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||||
let edition = "2015";
|
||||
if(classes.contains("edition2018")) {
|
||||
edition = "2018";
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||||
} else if(classes.contains("edition2021")) {
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||||
edition = "2021";
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}
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var params = {
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||||
version: "stable",
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optimize: "0",
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||||
code: text,
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edition: edition
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||||
};
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||||
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||||
if (text.indexOf("#![feature") !== -1) {
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||||
params.version = "nightly";
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||||
}
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||||
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result_block.innerText = "Running...";
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||||
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fetch_with_timeout("https://play.rust-lang.org/evaluate.json", {
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headers: {
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||||
'Content-Type': "application/json",
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||||
},
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||||
method: 'POST',
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||||
mode: 'cors',
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||||
body: JSON.stringify(params)
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||||
})
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||||
.then(response => response.json())
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.then(response => {
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||||
if (response.result.trim() === '') {
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result_block.innerText = "No output";
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result_block.classList.add("result-no-output");
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||||
} else {
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||||
result_block.innerText = response.result;
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result_block.classList.remove("result-no-output");
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||||
}
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||||
})
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||||
.catch(error => result_block.innerText = "Playground Communication: " + error.message);
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||||
}
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||||
|
||||
// Syntax highlighting Configuration
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||||
hljs.configure({
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||||
tabReplace: ' ', // 4 spaces
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||||
languages: [], // Languages used for auto-detection
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||||
});
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||||
|
||||
let code_nodes = Array
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||||
.from(document.querySelectorAll('code'))
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||||
// Don't highlight `inline code` blocks in headers.
|
||||
.filter(function (node) {return !node.parentElement.classList.contains("header"); });
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||||
|
||||
if (window.ace) {
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||||
// language-rust class needs to be removed for editable
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||||
// blocks or highlightjs will capture events
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||||
code_nodes
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||||
.filter(function (node) {return node.classList.contains("editable"); })
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||||
.forEach(function (block) { block.classList.remove('language-rust'); });
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Array
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||||
code_nodes
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||||
.filter(function (node) {return !node.classList.contains("editable"); })
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.forEach(function (block) { hljs.highlightBlock(block); });
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||||
} else {
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||||
code_nodes.forEach(function (block) { hljs.highlightBlock(block); });
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||||
}
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||||
|
||||
// Adding the hljs class gives code blocks the color css
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||||
// even if highlighting doesn't apply
|
||||
code_nodes.forEach(function (block) { block.classList.add('hljs'); });
|
||||
|
||||
Array.from(document.querySelectorAll("code.language-rust")).forEach(function (block) {
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||||
|
||||
var lines = Array.from(block.querySelectorAll('.boring'));
|
||||
// If no lines were hidden, return
|
||||
if (!lines.length) { return; }
|
||||
block.classList.add("hide-boring");
|
||||
|
||||
var buttons = document.createElement('div');
|
||||
buttons.className = 'buttons';
|
||||
buttons.innerHTML = "<button class=\"fa fa-eye\" title=\"Show hidden lines\" aria-label=\"Show hidden lines\"></button>";
|
||||
|
||||
// add expand button
|
||||
var pre_block = block.parentNode;
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||||
pre_block.insertBefore(buttons, pre_block.firstChild);
|
||||
|
||||
pre_block.querySelector('.buttons').addEventListener('click', function (e) {
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||||
if (e.target.classList.contains('fa-eye')) {
|
||||
e.target.classList.remove('fa-eye');
|
||||
e.target.classList.add('fa-eye-slash');
|
||||
e.target.title = 'Hide lines';
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||||
e.target.setAttribute('aria-label', e.target.title);
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||||
|
||||
block.classList.remove('hide-boring');
|
||||
} else if (e.target.classList.contains('fa-eye-slash')) {
|
||||
e.target.classList.remove('fa-eye-slash');
|
||||
e.target.classList.add('fa-eye');
|
||||
e.target.title = 'Show hidden lines';
|
||||
e.target.setAttribute('aria-label', e.target.title);
|
||||
|
||||
block.classList.add('hide-boring');
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
if (window.playground_copyable) {
|
||||
Array.from(document.querySelectorAll('pre code')).forEach(function (block) {
|
||||
var pre_block = block.parentNode;
|
||||
if (!pre_block.classList.contains('playground')) {
|
||||
var buttons = pre_block.querySelector(".buttons");
|
||||
if (!buttons) {
|
||||
buttons = document.createElement('div');
|
||||
buttons.className = 'buttons';
|
||||
pre_block.insertBefore(buttons, pre_block.firstChild);
|
||||
}
|
||||
|
||||
var clipButton = document.createElement('button');
|
||||
clipButton.className = 'fa fa-copy clip-button';
|
||||
clipButton.title = 'Copy to clipboard';
|
||||
clipButton.setAttribute('aria-label', clipButton.title);
|
||||
clipButton.innerHTML = '<i class=\"tooltiptext\"></i>';
|
||||
|
||||
buttons.insertBefore(clipButton, buttons.firstChild);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
// Process playground code blocks
|
||||
Array.from(document.querySelectorAll(".playground")).forEach(function (pre_block) {
|
||||
// Add play button
|
||||
var buttons = pre_block.querySelector(".buttons");
|
||||
if (!buttons) {
|
||||
buttons = document.createElement('div');
|
||||
buttons.className = 'buttons';
|
||||
pre_block.insertBefore(buttons, pre_block.firstChild);
|
||||
}
|
||||
|
||||
var runCodeButton = document.createElement('button');
|
||||
runCodeButton.className = 'fa fa-play play-button';
|
||||
runCodeButton.hidden = true;
|
||||
runCodeButton.title = 'Run this code';
|
||||
runCodeButton.setAttribute('aria-label', runCodeButton.title);
|
||||
|
||||
buttons.insertBefore(runCodeButton, buttons.firstChild);
|
||||
runCodeButton.addEventListener('click', function (e) {
|
||||
run_rust_code(pre_block);
|
||||
});
|
||||
|
||||
if (window.playground_copyable) {
|
||||
var copyCodeClipboardButton = document.createElement('button');
|
||||
copyCodeClipboardButton.className = 'fa fa-copy clip-button';
|
||||
copyCodeClipboardButton.innerHTML = '<i class="tooltiptext"></i>';
|
||||
copyCodeClipboardButton.title = 'Copy to clipboard';
|
||||
copyCodeClipboardButton.setAttribute('aria-label', copyCodeClipboardButton.title);
|
||||
|
||||
buttons.insertBefore(copyCodeClipboardButton, buttons.firstChild);
|
||||
}
|
||||
|
||||
let code_block = pre_block.querySelector("code");
|
||||
if (window.ace && code_block.classList.contains("editable")) {
|
||||
var undoChangesButton = document.createElement('button');
|
||||
undoChangesButton.className = 'fa fa-history reset-button';
|
||||
undoChangesButton.title = 'Undo changes';
|
||||
undoChangesButton.setAttribute('aria-label', undoChangesButton.title);
|
||||
|
||||
buttons.insertBefore(undoChangesButton, buttons.firstChild);
|
||||
|
||||
undoChangesButton.addEventListener('click', function () {
|
||||
let editor = window.ace.edit(code_block);
|
||||
editor.setValue(editor.originalCode);
|
||||
editor.clearSelection();
|
||||
});
|
||||
}
|
||||
});
|
||||
})();
|
||||
|
||||
(function themes() {
|
||||
var html = document.querySelector('html');
|
||||
var themeToggleButton = document.getElementById('theme-toggle');
|
||||
var themePopup = document.getElementById('theme-list');
|
||||
var themeColorMetaTag = document.querySelector('meta[name="theme-color"]');
|
||||
var stylesheets = {
|
||||
ayuHighlight: document.querySelector("[href$='ayu-highlight.css']"),
|
||||
tomorrowNight: document.querySelector("[href$='tomorrow-night.css']"),
|
||||
highlight: document.querySelector("[href$='highlight.css']"),
|
||||
};
|
||||
|
||||
function showThemes() {
|
||||
themePopup.style.display = 'block';
|
||||
themeToggleButton.setAttribute('aria-expanded', true);
|
||||
themePopup.querySelector("button#" + get_theme()).focus();
|
||||
}
|
||||
|
||||
function hideThemes() {
|
||||
themePopup.style.display = 'none';
|
||||
themeToggleButton.setAttribute('aria-expanded', false);
|
||||
themeToggleButton.focus();
|
||||
}
|
||||
|
||||
function get_theme() {
|
||||
var theme;
|
||||
try { theme = localStorage.getItem('mdbook-theme'); } catch (e) { }
|
||||
if (theme === null || theme === undefined) {
|
||||
return default_theme;
|
||||
} else {
|
||||
return theme;
|
||||
}
|
||||
}
|
||||
|
||||
function set_theme(theme, store = true) {
|
||||
let ace_theme;
|
||||
|
||||
if (theme == 'coal' || theme == 'navy') {
|
||||
stylesheets.ayuHighlight.disabled = true;
|
||||
stylesheets.tomorrowNight.disabled = false;
|
||||
stylesheets.highlight.disabled = true;
|
||||
|
||||
ace_theme = "ace/theme/tomorrow_night";
|
||||
} else if (theme == 'ayu') {
|
||||
stylesheets.ayuHighlight.disabled = false;
|
||||
stylesheets.tomorrowNight.disabled = true;
|
||||
stylesheets.highlight.disabled = true;
|
||||
ace_theme = "ace/theme/tomorrow_night";
|
||||
} else {
|
||||
stylesheets.ayuHighlight.disabled = true;
|
||||
stylesheets.tomorrowNight.disabled = true;
|
||||
stylesheets.highlight.disabled = false;
|
||||
ace_theme = "ace/theme/dawn";
|
||||
}
|
||||
|
||||
setTimeout(function () {
|
||||
themeColorMetaTag.content = getComputedStyle(document.body).backgroundColor;
|
||||
}, 1);
|
||||
|
||||
if (window.ace && window.editors) {
|
||||
window.editors.forEach(function (editor) {
|
||||
editor.setTheme(ace_theme);
|
||||
});
|
||||
}
|
||||
|
||||
var previousTheme = get_theme();
|
||||
|
||||
if (store) {
|
||||
try { localStorage.setItem('mdbook-theme', theme); } catch (e) { }
|
||||
}
|
||||
|
||||
html.classList.remove(previousTheme);
|
||||
html.classList.add(theme);
|
||||
}
|
||||
|
||||
// Set theme
|
||||
var theme = get_theme();
|
||||
|
||||
set_theme(theme, false);
|
||||
|
||||
themeToggleButton.addEventListener('click', function () {
|
||||
if (themePopup.style.display === 'block') {
|
||||
hideThemes();
|
||||
} else {
|
||||
showThemes();
|
||||
}
|
||||
});
|
||||
|
||||
themePopup.addEventListener('click', function (e) {
|
||||
var theme = e.target.id || e.target.parentElement.id;
|
||||
set_theme(theme);
|
||||
});
|
||||
|
||||
themePopup.addEventListener('focusout', function(e) {
|
||||
// e.relatedTarget is null in Safari and Firefox on macOS (see workaround below)
|
||||
if (!!e.relatedTarget && !themeToggleButton.contains(e.relatedTarget) && !themePopup.contains(e.relatedTarget)) {
|
||||
hideThemes();
|
||||
}
|
||||
});
|
||||
|
||||
// Should not be needed, but it works around an issue on macOS & iOS: https://github.com/rust-lang/mdBook/issues/628
|
||||
document.addEventListener('click', function(e) {
|
||||
if (themePopup.style.display === 'block' && !themeToggleButton.contains(e.target) && !themePopup.contains(e.target)) {
|
||||
hideThemes();
|
||||
}
|
||||
});
|
||||
|
||||
document.addEventListener('keydown', function (e) {
|
||||
if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) { return; }
|
||||
if (!themePopup.contains(e.target)) { return; }
|
||||
|
||||
switch (e.key) {
|
||||
case 'Escape':
|
||||
e.preventDefault();
|
||||
hideThemes();
|
||||
break;
|
||||
case 'ArrowUp':
|
||||
e.preventDefault();
|
||||
var li = document.activeElement.parentElement;
|
||||
if (li && li.previousElementSibling) {
|
||||
li.previousElementSibling.querySelector('button').focus();
|
||||
}
|
||||
break;
|
||||
case 'ArrowDown':
|
||||
e.preventDefault();
|
||||
var li = document.activeElement.parentElement;
|
||||
if (li && li.nextElementSibling) {
|
||||
li.nextElementSibling.querySelector('button').focus();
|
||||
}
|
||||
break;
|
||||
case 'Home':
|
||||
e.preventDefault();
|
||||
themePopup.querySelector('li:first-child button').focus();
|
||||
break;
|
||||
case 'End':
|
||||
e.preventDefault();
|
||||
themePopup.querySelector('li:last-child button').focus();
|
||||
break;
|
||||
}
|
||||
});
|
||||
})();
|
||||
|
||||
(function sidebar() {
|
||||
var html = document.querySelector("html");
|
||||
var sidebar = document.getElementById("sidebar");
|
||||
var sidebarLinks = document.querySelectorAll('#sidebar a');
|
||||
var sidebarToggleButton = document.getElementById("sidebar-toggle");
|
||||
var sidebarResizeHandle = document.getElementById("sidebar-resize-handle");
|
||||
var firstContact = null;
|
||||
|
||||
function showSidebar() {
|
||||
html.classList.remove('sidebar-hidden')
|
||||
html.classList.add('sidebar-visible');
|
||||
Array.from(sidebarLinks).forEach(function (link) {
|
||||
link.setAttribute('tabIndex', 0);
|
||||
});
|
||||
sidebarToggleButton.setAttribute('aria-expanded', true);
|
||||
sidebar.setAttribute('aria-hidden', false);
|
||||
try { localStorage.setItem('mdbook-sidebar', 'visible'); } catch (e) { }
|
||||
}
|
||||
|
||||
|
||||
var sidebarAnchorToggles = document.querySelectorAll('#sidebar a.toggle');
|
||||
|
||||
function toggleSection(ev) {
|
||||
ev.currentTarget.parentElement.classList.toggle('expanded');
|
||||
}
|
||||
|
||||
Array.from(sidebarAnchorToggles).forEach(function (el) {
|
||||
el.addEventListener('click', toggleSection);
|
||||
});
|
||||
|
||||
function hideSidebar() {
|
||||
html.classList.remove('sidebar-visible')
|
||||
html.classList.add('sidebar-hidden');
|
||||
Array.from(sidebarLinks).forEach(function (link) {
|
||||
link.setAttribute('tabIndex', -1);
|
||||
});
|
||||
sidebarToggleButton.setAttribute('aria-expanded', false);
|
||||
sidebar.setAttribute('aria-hidden', true);
|
||||
try { localStorage.setItem('mdbook-sidebar', 'hidden'); } catch (e) { }
|
||||
}
|
||||
|
||||
// Toggle sidebar
|
||||
sidebarToggleButton.addEventListener('click', function sidebarToggle() {
|
||||
if (html.classList.contains("sidebar-hidden")) {
|
||||
var current_width = parseInt(
|
||||
document.documentElement.style.getPropertyValue('--sidebar-width'), 10);
|
||||
if (current_width < 150) {
|
||||
document.documentElement.style.setProperty('--sidebar-width', '150px');
|
||||
}
|
||||
showSidebar();
|
||||
} else if (html.classList.contains("sidebar-visible")) {
|
||||
hideSidebar();
|
||||
} else {
|
||||
if (getComputedStyle(sidebar)['transform'] === 'none') {
|
||||
hideSidebar();
|
||||
} else {
|
||||
showSidebar();
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
sidebarResizeHandle.addEventListener('mousedown', initResize, false);
|
||||
|
||||
function initResize(e) {
|
||||
window.addEventListener('mousemove', resize, false);
|
||||
window.addEventListener('mouseup', stopResize, false);
|
||||
html.classList.add('sidebar-resizing');
|
||||
}
|
||||
function resize(e) {
|
||||
var pos = (e.clientX - sidebar.offsetLeft);
|
||||
if (pos < 20) {
|
||||
hideSidebar();
|
||||
} else {
|
||||
if (html.classList.contains("sidebar-hidden")) {
|
||||
showSidebar();
|
||||
}
|
||||
pos = Math.min(pos, window.innerWidth - 100);
|
||||
document.documentElement.style.setProperty('--sidebar-width', pos + 'px');
|
||||
}
|
||||
}
|
||||
//on mouseup remove windows functions mousemove & mouseup
|
||||
function stopResize(e) {
|
||||
html.classList.remove('sidebar-resizing');
|
||||
window.removeEventListener('mousemove', resize, false);
|
||||
window.removeEventListener('mouseup', stopResize, false);
|
||||
}
|
||||
|
||||
document.addEventListener('touchstart', function (e) {
|
||||
firstContact = {
|
||||
x: e.touches[0].clientX,
|
||||
time: Date.now()
|
||||
};
|
||||
}, { passive: true });
|
||||
|
||||
document.addEventListener('touchmove', function (e) {
|
||||
if (!firstContact)
|
||||
return;
|
||||
|
||||
var curX = e.touches[0].clientX;
|
||||
var xDiff = curX - firstContact.x,
|
||||
tDiff = Date.now() - firstContact.time;
|
||||
|
||||
if (tDiff < 250 && Math.abs(xDiff) >= 150) {
|
||||
if (xDiff >= 0 && firstContact.x < Math.min(document.body.clientWidth * 0.25, 300))
|
||||
showSidebar();
|
||||
else if (xDiff < 0 && curX < 300)
|
||||
hideSidebar();
|
||||
|
||||
firstContact = null;
|
||||
}
|
||||
}, { passive: true });
|
||||
|
||||
// Scroll sidebar to current active section
|
||||
var activeSection = document.getElementById("sidebar").querySelector(".active");
|
||||
if (activeSection) {
|
||||
// https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView
|
||||
activeSection.scrollIntoView({ block: 'center' });
|
||||
}
|
||||
})();
|
||||
|
||||
(function chapterNavigation() {
|
||||
document.addEventListener('keydown', function (e) {
|
||||
if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) { return; }
|
||||
if (window.search && window.search.hasFocus()) { return; }
|
||||
|
||||
switch (e.key) {
|
||||
case 'ArrowRight':
|
||||
e.preventDefault();
|
||||
var nextButton = document.querySelector('.nav-chapters.next');
|
||||
if (nextButton) {
|
||||
window.location.href = nextButton.href;
|
||||
}
|
||||
break;
|
||||
case 'ArrowLeft':
|
||||
e.preventDefault();
|
||||
var previousButton = document.querySelector('.nav-chapters.previous');
|
||||
if (previousButton) {
|
||||
window.location.href = previousButton.href;
|
||||
}
|
||||
break;
|
||||
}
|
||||
});
|
||||
})();
|
||||
|
||||
(function clipboard() {
|
||||
var clipButtons = document.querySelectorAll('.clip-button');
|
||||
|
||||
function hideTooltip(elem) {
|
||||
elem.firstChild.innerText = "";
|
||||
elem.className = 'fa fa-copy clip-button';
|
||||
}
|
||||
|
||||
function showTooltip(elem, msg) {
|
||||
elem.firstChild.innerText = msg;
|
||||
elem.className = 'fa fa-copy tooltipped';
|
||||
}
|
||||
|
||||
var clipboardSnippets = new ClipboardJS('.clip-button', {
|
||||
text: function (trigger) {
|
||||
hideTooltip(trigger);
|
||||
let playground = trigger.closest("pre");
|
||||
return playground_text(playground);
|
||||
}
|
||||
});
|
||||
|
||||
Array.from(clipButtons).forEach(function (clipButton) {
|
||||
clipButton.addEventListener('mouseout', function (e) {
|
||||
hideTooltip(e.currentTarget);
|
||||
});
|
||||
});
|
||||
|
||||
clipboardSnippets.on('success', function (e) {
|
||||
e.clearSelection();
|
||||
showTooltip(e.trigger, "Copied!");
|
||||
});
|
||||
|
||||
clipboardSnippets.on('error', function (e) {
|
||||
showTooltip(e.trigger, "Clipboard error!");
|
||||
});
|
||||
})();
|
||||
|
||||
(function scrollToTop () {
|
||||
var menuTitle = document.querySelector('.menu-title');
|
||||
|
||||
menuTitle.addEventListener('click', function () {
|
||||
document.scrollingElement.scrollTo({ top: 0, behavior: 'smooth' });
|
||||
});
|
||||
})();
|
||||
|
||||
(function controllMenu() {
|
||||
var menu = document.getElementById('menu-bar');
|
||||
|
||||
(function controllPosition() {
|
||||
var scrollTop = document.scrollingElement.scrollTop;
|
||||
var prevScrollTop = scrollTop;
|
||||
var minMenuY = -menu.clientHeight - 50;
|
||||
// When the script loads, the page can be at any scroll (e.g. if you reforesh it).
|
||||
menu.style.top = scrollTop + 'px';
|
||||
// Same as parseInt(menu.style.top.slice(0, -2), but faster
|
||||
var topCache = menu.style.top.slice(0, -2);
|
||||
menu.classList.remove('sticky');
|
||||
var stickyCache = false; // Same as menu.classList.contains('sticky'), but faster
|
||||
document.addEventListener('scroll', function () {
|
||||
scrollTop = Math.max(document.scrollingElement.scrollTop, 0);
|
||||
// `null` means that it doesn't need to be updated
|
||||
var nextSticky = null;
|
||||
var nextTop = null;
|
||||
var scrollDown = scrollTop > prevScrollTop;
|
||||
var menuPosAbsoluteY = topCache - scrollTop;
|
||||
if (scrollDown) {
|
||||
nextSticky = false;
|
||||
if (menuPosAbsoluteY > 0) {
|
||||
nextTop = prevScrollTop;
|
||||
}
|
||||
} else {
|
||||
if (menuPosAbsoluteY > 0) {
|
||||
nextSticky = true;
|
||||
} else if (menuPosAbsoluteY < minMenuY) {
|
||||
nextTop = prevScrollTop + minMenuY;
|
||||
}
|
||||
}
|
||||
if (nextSticky === true && stickyCache === false) {
|
||||
menu.classList.add('sticky');
|
||||
stickyCache = true;
|
||||
} else if (nextSticky === false && stickyCache === true) {
|
||||
menu.classList.remove('sticky');
|
||||
stickyCache = false;
|
||||
}
|
||||
if (nextTop !== null) {
|
||||
menu.style.top = nextTop + 'px';
|
||||
topCache = nextTop;
|
||||
}
|
||||
prevScrollTop = scrollTop;
|
||||
}, { passive: true });
|
||||
})();
|
||||
(function controllBorder() {
|
||||
menu.classList.remove('bordered');
|
||||
document.addEventListener('scroll', function () {
|
||||
if (menu.offsetTop === 0) {
|
||||
menu.classList.remove('bordered');
|
||||
} else {
|
||||
menu.classList.add('bordered');
|
||||
}
|
||||
}, { passive: true });
|
||||
})();
|
||||
})();
|
||||
File diff suppressed because one or more lines are too long
@ -1,495 +0,0 @@
|
||||
/* CSS for UI elements (a.k.a. chrome) */
|
||||
|
||||
@import 'variables.css';
|
||||
|
||||
::-webkit-scrollbar {
|
||||
background: var(--bg);
|
||||
}
|
||||
::-webkit-scrollbar-thumb {
|
||||
background: var(--scrollbar);
|
||||
}
|
||||
html {
|
||||
scrollbar-color: var(--scrollbar) var(--bg);
|
||||
}
|
||||
#searchresults a,
|
||||
.content a:link,
|
||||
a:visited,
|
||||
a > .hljs {
|
||||
color: var(--links);
|
||||
}
|
||||
|
||||
/* Menu Bar */
|
||||
|
||||
#menu-bar,
|
||||
#menu-bar-hover-placeholder {
|
||||
z-index: 101;
|
||||
margin: auto calc(0px - var(--page-padding));
|
||||
}
|
||||
#menu-bar {
|
||||
position: relative;
|
||||
display: flex;
|
||||
flex-wrap: wrap;
|
||||
background-color: var(--bg);
|
||||
border-bottom-color: var(--bg);
|
||||
border-bottom-width: 1px;
|
||||
border-bottom-style: solid;
|
||||
}
|
||||
#menu-bar.sticky,
|
||||
.js #menu-bar-hover-placeholder:hover + #menu-bar,
|
||||
.js #menu-bar:hover,
|
||||
.js.sidebar-visible #menu-bar {
|
||||
position: -webkit-sticky;
|
||||
position: sticky;
|
||||
top: 0 !important;
|
||||
}
|
||||
#menu-bar-hover-placeholder {
|
||||
position: sticky;
|
||||
position: -webkit-sticky;
|
||||
top: 0;
|
||||
height: var(--menu-bar-height);
|
||||
}
|
||||
#menu-bar.bordered {
|
||||
border-bottom-color: var(--table-border-color);
|
||||
}
|
||||
#menu-bar i, #menu-bar .icon-button {
|
||||
position: relative;
|
||||
padding: 0 8px;
|
||||
z-index: 10;
|
||||
line-height: var(--menu-bar-height);
|
||||
cursor: pointer;
|
||||
transition: color 0.5s;
|
||||
}
|
||||
@media only screen and (max-width: 420px) {
|
||||
#menu-bar i, #menu-bar .icon-button {
|
||||
padding: 0 5px;
|
||||
}
|
||||
}
|
||||
|
||||
.icon-button {
|
||||
border: none;
|
||||
background: none;
|
||||
padding: 0;
|
||||
color: inherit;
|
||||
}
|
||||
.icon-button i {
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
.right-buttons {
|
||||
margin: 0 15px;
|
||||
}
|
||||
.right-buttons a {
|
||||
text-decoration: none;
|
||||
}
|
||||
|
||||
.left-buttons {
|
||||
display: flex;
|
||||
margin: 0 5px;
|
||||
}
|
||||
.no-js .left-buttons {
|
||||
display: none;
|
||||
}
|
||||
|
||||
.menu-title {
|
||||
display: inline-block;
|
||||
font-weight: 200;
|
||||
font-size: 2.4rem;
|
||||
line-height: var(--menu-bar-height);
|
||||
text-align: center;
|
||||
margin: 0;
|
||||
flex: 1;
|
||||
white-space: nowrap;
|
||||
overflow: hidden;
|
||||
text-overflow: ellipsis;
|
||||
}
|
||||
.js .menu-title {
|
||||
cursor: pointer;
|
||||
}
|
||||
|
||||
.menu-bar,
|
||||
.menu-bar:visited,
|
||||
.nav-chapters,
|
||||
.nav-chapters:visited,
|
||||
.mobile-nav-chapters,
|
||||
.mobile-nav-chapters:visited,
|
||||
.menu-bar .icon-button,
|
||||
.menu-bar a i {
|
||||
color: var(--icons);
|
||||
}
|
||||
|
||||
.menu-bar i:hover,
|
||||
.menu-bar .icon-button:hover,
|
||||
.nav-chapters:hover,
|
||||
.mobile-nav-chapters i:hover {
|
||||
color: var(--icons-hover);
|
||||
}
|
||||
|
||||
/* Nav Icons */
|
||||
|
||||
.nav-chapters {
|
||||
font-size: 2.5em;
|
||||
text-align: center;
|
||||
text-decoration: none;
|
||||
|
||||
position: fixed;
|
||||
top: 0;
|
||||
bottom: 0;
|
||||
margin: 0;
|
||||
max-width: 150px;
|
||||
min-width: 90px;
|
||||
|
||||
display: flex;
|
||||
justify-content: center;
|
||||
align-content: center;
|
||||
flex-direction: column;
|
||||
|
||||
transition: color 0.5s, background-color 0.5s;
|
||||
}
|
||||
|
||||
.nav-chapters:hover {
|
||||
text-decoration: none;
|
||||
background-color: var(--theme-hover);
|
||||
transition: background-color 0.15s, color 0.15s;
|
||||
}
|
||||
|
||||
.nav-wrapper {
|
||||
margin-top: 50px;
|
||||
display: none;
|
||||
}
|
||||
|
||||
.mobile-nav-chapters {
|
||||
font-size: 2.5em;
|
||||
text-align: center;
|
||||
text-decoration: none;
|
||||
width: 90px;
|
||||
border-radius: 5px;
|
||||
background-color: var(--sidebar-bg);
|
||||
}
|
||||
|
||||
.previous {
|
||||
float: left;
|
||||
}
|
||||
|
||||
.next {
|
||||
float: right;
|
||||
right: var(--page-padding);
|
||||
}
|
||||
|
||||
@media only screen and (max-width: 1080px) {
|
||||
.nav-wide-wrapper { display: none; }
|
||||
.nav-wrapper { display: block; }
|
||||
}
|
||||
|
||||
@media only screen and (max-width: 1380px) {
|
||||
.sidebar-visible .nav-wide-wrapper { display: none; }
|
||||
.sidebar-visible .nav-wrapper { display: block; }
|
||||
}
|
||||
|
||||
/* Inline code */
|
||||
|
||||
:not(pre) > .hljs {
|
||||
display: inline;
|
||||
padding: 0.1em 0.3em;
|
||||
border-radius: 3px;
|
||||
}
|
||||
|
||||
:not(pre):not(a) > .hljs {
|
||||
color: var(--inline-code-color);
|
||||
overflow-x: initial;
|
||||
}
|
||||
|
||||
a:hover > .hljs {
|
||||
text-decoration: underline;
|
||||
}
|
||||
|
||||
pre {
|
||||
position: relative;
|
||||
}
|
||||
pre > .buttons {
|
||||
position: absolute;
|
||||
z-index: 100;
|
||||
right: 5px;
|
||||
top: 5px;
|
||||
|
||||
color: var(--sidebar-fg);
|
||||
cursor: pointer;
|
||||
}
|
||||
pre > .buttons :hover {
|
||||
color: var(--sidebar-active);
|
||||
}
|
||||
pre > .buttons i {
|
||||
margin-left: 8px;
|
||||
}
|
||||
pre > .buttons button {
|
||||
color: inherit;
|
||||
background: transparent;
|
||||
border: none;
|
||||
cursor: inherit;
|
||||
}
|
||||
pre > .result {
|
||||
margin-top: 10px;
|
||||
}
|
||||
|
||||
/* Search */
|
||||
|
||||
#searchresults a {
|
||||
text-decoration: none;
|
||||
}
|
||||
|
||||
mark {
|
||||
border-radius: 2px;
|
||||
padding: 0 3px 1px 3px;
|
||||
margin: 0 -3px -1px -3px;
|
||||
background-color: var(--search-mark-bg);
|
||||
transition: background-color 300ms linear;
|
||||
cursor: pointer;
|
||||
}
|
||||
|
||||
mark.fade-out {
|
||||
background-color: rgba(0,0,0,0) !important;
|
||||
cursor: auto;
|
||||
}
|
||||
|
||||
.searchbar-outer {
|
||||
margin-left: auto;
|
||||
margin-right: auto;
|
||||
max-width: var(--content-max-width);
|
||||
}
|
||||
|
||||
#searchbar {
|
||||
width: 100%;
|
||||
margin: 5px auto 0px auto;
|
||||
padding: 10px 16px;
|
||||
transition: box-shadow 300ms ease-in-out;
|
||||
border: 1px solid var(--searchbar-border-color);
|
||||
border-radius: 3px;
|
||||
background-color: var(--searchbar-bg);
|
||||
color: var(--searchbar-fg);
|
||||
}
|
||||
#searchbar:focus,
|
||||
#searchbar.active {
|
||||
box-shadow: 0 0 3px var(--searchbar-shadow-color);
|
||||
}
|
||||
|
||||
.searchresults-header {
|
||||
font-weight: bold;
|
||||
font-size: 1em;
|
||||
padding: 18px 0 0 5px;
|
||||
color: var(--searchresults-header-fg);
|
||||
}
|
||||
|
||||
.searchresults-outer {
|
||||
margin-left: auto;
|
||||
margin-right: auto;
|
||||
max-width: var(--content-max-width);
|
||||
border-bottom: 1px dashed var(--searchresults-border-color);
|
||||
}
|
||||
|
||||
ul#searchresults {
|
||||
list-style: none;
|
||||
padding-left: 20px;
|
||||
}
|
||||
ul#searchresults li {
|
||||
margin: 10px 0px;
|
||||
padding: 2px;
|
||||
border-radius: 2px;
|
||||
}
|
||||
ul#searchresults li.focus {
|
||||
background-color: var(--searchresults-li-bg);
|
||||
}
|
||||
ul#searchresults span.teaser {
|
||||
display: block;
|
||||
clear: both;
|
||||
margin: 5px 0 0 20px;
|
||||
font-size: 0.8em;
|
||||
}
|
||||
ul#searchresults span.teaser em {
|
||||
font-weight: bold;
|
||||
font-style: normal;
|
||||
}
|
||||
|
||||
/* Sidebar */
|
||||
|
||||
.sidebar {
|
||||
position: fixed;
|
||||
left: 0;
|
||||
top: 0;
|
||||
bottom: 0;
|
||||
width: var(--sidebar-width);
|
||||
font-size: 0.875em;
|
||||
box-sizing: border-box;
|
||||
-webkit-overflow-scrolling: touch;
|
||||
overscroll-behavior-y: contain;
|
||||
background-color: var(--sidebar-bg);
|
||||
color: var(--sidebar-fg);
|
||||
}
|
||||
.sidebar-resizing {
|
||||
-moz-user-select: none;
|
||||
-webkit-user-select: none;
|
||||
-ms-user-select: none;
|
||||
user-select: none;
|
||||
}
|
||||
.js:not(.sidebar-resizing) .sidebar {
|
||||
transition: transform 0.3s; /* Animation: slide away */
|
||||
}
|
||||
.sidebar code {
|
||||
line-height: 2em;
|
||||
}
|
||||
.sidebar .sidebar-scrollbox {
|
||||
overflow-y: auto;
|
||||
position: absolute;
|
||||
top: 0;
|
||||
bottom: 0;
|
||||
left: 0;
|
||||
right: 0;
|
||||
padding: 10px 10px;
|
||||
}
|
||||
.sidebar .sidebar-resize-handle {
|
||||
position: absolute;
|
||||
cursor: col-resize;
|
||||
width: 0;
|
||||
right: 0;
|
||||
top: 0;
|
||||
bottom: 0;
|
||||
}
|
||||
.js .sidebar .sidebar-resize-handle {
|
||||
cursor: col-resize;
|
||||
width: 5px;
|
||||
}
|
||||
.sidebar-hidden .sidebar {
|
||||
transform: translateX(calc(0px - var(--sidebar-width)));
|
||||
}
|
||||
.sidebar::-webkit-scrollbar {
|
||||
background: var(--sidebar-bg);
|
||||
}
|
||||
.sidebar::-webkit-scrollbar-thumb {
|
||||
background: var(--scrollbar);
|
||||
}
|
||||
|
||||
.sidebar-visible .page-wrapper {
|
||||
transform: translateX(var(--sidebar-width));
|
||||
}
|
||||
@media only screen and (min-width: 620px) {
|
||||
.sidebar-visible .page-wrapper {
|
||||
transform: none;
|
||||
margin-left: var(--sidebar-width);
|
||||
}
|
||||
}
|
||||
|
||||
.chapter {
|
||||
list-style: none outside none;
|
||||
padding-left: 0;
|
||||
line-height: 2.2em;
|
||||
}
|
||||
|
||||
.chapter ol {
|
||||
width: 100%;
|
||||
}
|
||||
|
||||
.chapter li {
|
||||
display: flex;
|
||||
color: var(--sidebar-non-existant);
|
||||
}
|
||||
.chapter li a {
|
||||
display: block;
|
||||
padding: 0;
|
||||
text-decoration: none;
|
||||
color: var(--sidebar-fg);
|
||||
}
|
||||
|
||||
.chapter li a:hover {
|
||||
color: var(--sidebar-active);
|
||||
}
|
||||
|
||||
.chapter li a.active {
|
||||
color: var(--sidebar-active);
|
||||
}
|
||||
|
||||
.chapter li > a.toggle {
|
||||
cursor: pointer;
|
||||
display: block;
|
||||
margin-left: auto;
|
||||
padding: 0 10px;
|
||||
user-select: none;
|
||||
opacity: 0.68;
|
||||
}
|
||||
|
||||
.chapter li > a.toggle div {
|
||||
transition: transform 0.5s;
|
||||
}
|
||||
|
||||
/* collapse the section */
|
||||
.chapter li:not(.expanded) + li > ol {
|
||||
display: none;
|
||||
}
|
||||
|
||||
.chapter li.chapter-item {
|
||||
line-height: 1.5em;
|
||||
margin-top: 0.6em;
|
||||
}
|
||||
|
||||
.chapter li.expanded > a.toggle div {
|
||||
transform: rotate(90deg);
|
||||
}
|
||||
|
||||
.spacer {
|
||||
width: 100%;
|
||||
height: 3px;
|
||||
margin: 5px 0px;
|
||||
}
|
||||
.chapter .spacer {
|
||||
background-color: var(--sidebar-spacer);
|
||||
}
|
||||
|
||||
@media (-moz-touch-enabled: 1), (pointer: coarse) {
|
||||
.chapter li a { padding: 5px 0; }
|
||||
.spacer { margin: 10px 0; }
|
||||
}
|
||||
|
||||
.section {
|
||||
list-style: none outside none;
|
||||
padding-left: 20px;
|
||||
line-height: 1.9em;
|
||||
}
|
||||
|
||||
/* Theme Menu Popup */
|
||||
|
||||
.theme-popup {
|
||||
position: absolute;
|
||||
left: 10px;
|
||||
top: var(--menu-bar-height);
|
||||
z-index: 1000;
|
||||
border-radius: 4px;
|
||||
font-size: 0.7em;
|
||||
color: var(--fg);
|
||||
background: var(--theme-popup-bg);
|
||||
border: 1px solid var(--theme-popup-border);
|
||||
margin: 0;
|
||||
padding: 0;
|
||||
list-style: none;
|
||||
display: none;
|
||||
}
|
||||
.theme-popup .default {
|
||||
color: var(--icons);
|
||||
}
|
||||
.theme-popup .theme {
|
||||
width: 100%;
|
||||
border: 0;
|
||||
margin: 0;
|
||||
padding: 2px 10px;
|
||||
line-height: 25px;
|
||||
white-space: nowrap;
|
||||
text-align: left;
|
||||
cursor: pointer;
|
||||
color: inherit;
|
||||
background: inherit;
|
||||
font-size: inherit;
|
||||
}
|
||||
.theme-popup .theme:hover {
|
||||
background-color: var(--theme-hover);
|
||||
}
|
||||
.theme-popup .theme:hover:first-child,
|
||||
.theme-popup .theme:hover:last-child {
|
||||
border-top-left-radius: inherit;
|
||||
border-top-right-radius: inherit;
|
||||
}
|
||||
@ -1,181 +0,0 @@
|
||||
/* Base styles and content styles */
|
||||
|
||||
@import 'variables.css';
|
||||
|
||||
:root {
|
||||
/* Browser default font-size is 16px, this way 1 rem = 10px */
|
||||
font-size: 62.5%;
|
||||
}
|
||||
|
||||
html {
|
||||
font-family: "Open Sans", sans-serif;
|
||||
color: var(--fg);
|
||||
background-color: var(--bg);
|
||||
text-size-adjust: none;
|
||||
}
|
||||
|
||||
body {
|
||||
margin: 0;
|
||||
font-size: 1.6rem;
|
||||
overflow-x: hidden;
|
||||
}
|
||||
|
||||
code {
|
||||
font-family: "Source Code Pro", Consolas, "Ubuntu Mono", Menlo, "DejaVu Sans Mono", monospace, monospace !important;
|
||||
font-size: 0.875em; /* please adjust the ace font size accordingly in editor.js */
|
||||
}
|
||||
|
||||
/* Don't change font size in headers. */
|
||||
h1 code, h2 code, h3 code, h4 code, h5 code, h6 code {
|
||||
font-size: unset;
|
||||
}
|
||||
|
||||
.left { float: left; }
|
||||
.right { float: right; }
|
||||
.boring { opacity: 0.6; }
|
||||
.hide-boring .boring { display: none; }
|
||||
.hidden { display: none !important; }
|
||||
|
||||
h2, h3 { margin-top: 2.5em; }
|
||||
h4, h5 { margin-top: 2em; }
|
||||
|
||||
.header + .header h3,
|
||||
.header + .header h4,
|
||||
.header + .header h5 {
|
||||
margin-top: 1em;
|
||||
}
|
||||
|
||||
h1:target::before,
|
||||
h2:target::before,
|
||||
h3:target::before,
|
||||
h4:target::before,
|
||||
h5:target::before,
|
||||
h6:target::before {
|
||||
display: inline-block;
|
||||
content: "»";
|
||||
margin-left: -30px;
|
||||
width: 30px;
|
||||
}
|
||||
|
||||
/* This is broken on Safari as of version 14, but is fixed
|
||||
in Safari Technology Preview 117 which I think will be Safari 14.2.
|
||||
https://bugs.webkit.org/show_bug.cgi?id=218076
|
||||
*/
|
||||
:target {
|
||||
scroll-margin-top: calc(var(--menu-bar-height) + 0.5em);
|
||||
}
|
||||
|
||||
.page {
|
||||
outline: 0;
|
||||
padding: 0 var(--page-padding);
|
||||
margin-top: calc(0px - var(--menu-bar-height)); /* Compensate for the #menu-bar-hover-placeholder */
|
||||
}
|
||||
.page-wrapper {
|
||||
box-sizing: border-box;
|
||||
}
|
||||
.js:not(.sidebar-resizing) .page-wrapper {
|
||||
transition: margin-left 0.3s ease, transform 0.3s ease; /* Animation: slide away */
|
||||
}
|
||||
|
||||
.content {
|
||||
overflow-y: auto;
|
||||
padding: 0 15px;
|
||||
padding-bottom: 50px;
|
||||
}
|
||||
.content main {
|
||||
margin-left: auto;
|
||||
margin-right: auto;
|
||||
max-width: var(--content-max-width);
|
||||
}
|
||||
.content p { line-height: 1.45em; }
|
||||
.content ol { line-height: 1.45em; }
|
||||
.content ul { line-height: 1.45em; }
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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--theme-hover: #1f2124;
|
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|
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--quote-bg: hsl(234, 21%, 18%);
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--search-mark-bg: #355c7d;
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}
|
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}
|
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@ -1,199 +0,0 @@
|
||||
<!DOCTYPE HTML>
|
||||
<html lang="en" class="sidebar-visible no-js light">
|
||||
<head>
|
||||
<!-- Book generated using mdBook -->
|
||||
<meta charset="UTF-8">
|
||||
<title>eBPF Program Limitiations - Building eBPF Programs With Aya</title>
|
||||
<!-- Custom HTML head -->
|
||||
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
|
||||
<meta name="description" content="">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
<meta name="theme-color" content="#ffffff" />
|
||||
|
||||
<link rel="icon" href="../favicon.svg">
|
||||
<link rel="shortcut icon" href="../favicon.png">
|
||||
<link rel="stylesheet" href="../css/variables.css">
|
||||
<link rel="stylesheet" href="../css/general.css">
|
||||
<link rel="stylesheet" href="../css/chrome.css">
|
||||
<link rel="stylesheet" href="../css/print.css" media="print">
|
||||
<!-- Fonts -->
|
||||
<link rel="stylesheet" href="../FontAwesome/css/font-awesome.css">
|
||||
<link rel="stylesheet" href="../fonts/fonts.css">
|
||||
<!-- Highlight.js Stylesheets -->
|
||||
<link rel="stylesheet" href="../highlight.css">
|
||||
<link rel="stylesheet" href="../tomorrow-night.css">
|
||||
<link rel="stylesheet" href="../ayu-highlight.css">
|
||||
|
||||
<!-- Custom theme stylesheets -->
|
||||
</head>
|
||||
<body>
|
||||
<!-- Provide site root to javascript -->
|
||||
<script type="text/javascript">
|
||||
var path_to_root = "../";
|
||||
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
|
||||
</script>
|
||||
|
||||
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|
||||
<script type="text/javascript">
|
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try {
|
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var theme = localStorage.getItem('mdbook-theme');
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var sidebar = localStorage.getItem('mdbook-sidebar');
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|
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|
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|
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|
||||
} catch (e) { }
|
||||
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|
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|
||||
<!-- Set the theme before any content is loaded, prevents flash -->
|
||||
<script type="text/javascript">
|
||||
var theme;
|
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try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
|
||||
if (theme === null || theme === undefined) { theme = default_theme; }
|
||||
var html = document.querySelector('html');
|
||||
html.classList.remove('no-js')
|
||||
html.classList.remove('light')
|
||||
html.classList.add(theme);
|
||||
html.classList.add('js');
|
||||
</script>
|
||||
|
||||
<!-- Hide / unhide sidebar before it is displayed -->
|
||||
<script type="text/javascript">
|
||||
var html = document.querySelector('html');
|
||||
var sidebar = 'hidden';
|
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if (document.body.clientWidth >= 1080) {
|
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try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
|
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|
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}
|
||||
html.classList.remove('sidebar-visible');
|
||||
html.classList.add("sidebar-" + sidebar);
|
||||
</script>
|
||||
|
||||
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
|
||||
<div class="sidebar-scrollbox">
|
||||
<ol class="chapter"><li class="chapter-item expanded "><a href="../intro/index.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="../ebpf/index.html" class="active"><strong aria-hidden="true">2.</strong> eBPF Program Limitiations</a></li><li class="chapter-item expanded "><a href="../start/index.html"><strong aria-hidden="true">3.</strong> Getting Started</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../start/development.html"><strong aria-hidden="true">3.1.</strong> Development Environment</a></li><li class="chapter-item expanded "><a href="../start/hello-xdp.html"><strong aria-hidden="true">3.2.</strong> Hello XDP!</a></li><li class="chapter-item expanded "><a href="../start/logging-packets.html"><strong aria-hidden="true">3.3.</strong> Logging Packets</a></li></ol></li></ol>
|
||||
</div>
|
||||
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
|
||||
</nav>
|
||||
|
||||
<div id="page-wrapper" class="page-wrapper">
|
||||
|
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<h1 id="ebpf-program-constraints"><a class="header" href="#ebpf-program-constraints">eBPF Program Constraints</a></h1>
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||||
OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
|
||||
COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||||
INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
|
||||
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||||
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
|
||||
OTHER DEALINGS IN THE FONT SOFTWARE.
|
||||
@ -1,100 +0,0 @@
|
||||
/* Open Sans is licensed under the Apache License, Version 2.0. See http://www.apache.org/licenses/LICENSE-2.0 */
|
||||
/* Source Code Pro is under the Open Font License. See https://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFL */
|
||||
|
||||
/* open-sans-300 - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: normal;
|
||||
font-weight: 300;
|
||||
src: local('Open Sans Light'), local('OpenSans-Light'),
|
||||
url('open-sans-v17-all-charsets-300.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-300italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: italic;
|
||||
font-weight: 300;
|
||||
src: local('Open Sans Light Italic'), local('OpenSans-LightItalic'),
|
||||
url('open-sans-v17-all-charsets-300italic.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-regular - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: normal;
|
||||
font-weight: 400;
|
||||
src: local('Open Sans Regular'), local('OpenSans-Regular'),
|
||||
url('open-sans-v17-all-charsets-regular.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: italic;
|
||||
font-weight: 400;
|
||||
src: local('Open Sans Italic'), local('OpenSans-Italic'),
|
||||
url('open-sans-v17-all-charsets-italic.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-600 - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: normal;
|
||||
font-weight: 600;
|
||||
src: local('Open Sans SemiBold'), local('OpenSans-SemiBold'),
|
||||
url('open-sans-v17-all-charsets-600.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-600italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: italic;
|
||||
font-weight: 600;
|
||||
src: local('Open Sans SemiBold Italic'), local('OpenSans-SemiBoldItalic'),
|
||||
url('open-sans-v17-all-charsets-600italic.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-700 - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: normal;
|
||||
font-weight: 700;
|
||||
src: local('Open Sans Bold'), local('OpenSans-Bold'),
|
||||
url('open-sans-v17-all-charsets-700.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-700italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: italic;
|
||||
font-weight: 700;
|
||||
src: local('Open Sans Bold Italic'), local('OpenSans-BoldItalic'),
|
||||
url('open-sans-v17-all-charsets-700italic.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-800 - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: normal;
|
||||
font-weight: 800;
|
||||
src: local('Open Sans ExtraBold'), local('OpenSans-ExtraBold'),
|
||||
url('open-sans-v17-all-charsets-800.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* open-sans-800italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Open Sans';
|
||||
font-style: italic;
|
||||
font-weight: 800;
|
||||
src: local('Open Sans ExtraBold Italic'), local('OpenSans-ExtraBoldItalic'),
|
||||
url('open-sans-v17-all-charsets-800italic.woff2') format('woff2');
|
||||
}
|
||||
|
||||
/* source-code-pro-500 - latin_vietnamese_latin-ext_greek_cyrillic-ext_cyrillic */
|
||||
@font-face {
|
||||
font-family: 'Source Code Pro';
|
||||
font-style: normal;
|
||||
font-weight: 500;
|
||||
src: url('source-code-pro-v11-all-charsets-500.woff2') format('woff2');
|
||||
}
|
||||
Binary file not shown.
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Binary file not shown.
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@ -1,83 +0,0 @@
|
||||
/*
|
||||
* An increased contrast highlighting scheme loosely based on the
|
||||
* "Base16 Atelier Dune Light" theme by Bram de Haan
|
||||
* (http://atelierbram.github.io/syntax-highlighting/atelier-schemes/dune)
|
||||
* Original Base16 color scheme by Chris Kempson
|
||||
* (https://github.com/chriskempson/base16)
|
||||
*/
|
||||
|
||||
/* Comment */
|
||||
.hljs-comment,
|
||||
.hljs-quote {
|
||||
color: #575757;
|
||||
}
|
||||
|
||||
/* Red */
|
||||
.hljs-variable,
|
||||
.hljs-template-variable,
|
||||
.hljs-attribute,
|
||||
.hljs-tag,
|
||||
.hljs-name,
|
||||
.hljs-regexp,
|
||||
.hljs-link,
|
||||
.hljs-name,
|
||||
.hljs-selector-id,
|
||||
.hljs-selector-class {
|
||||
color: #d70025;
|
||||
}
|
||||
|
||||
/* Orange */
|
||||
.hljs-number,
|
||||
.hljs-meta,
|
||||
.hljs-built_in,
|
||||
.hljs-builtin-name,
|
||||
.hljs-literal,
|
||||
.hljs-type,
|
||||
.hljs-params {
|
||||
color: #b21e00;
|
||||
}
|
||||
|
||||
/* Green */
|
||||
.hljs-string,
|
||||
.hljs-symbol,
|
||||
.hljs-bullet {
|
||||
color: #008200;
|
||||
}
|
||||
|
||||
/* Blue */
|
||||
.hljs-title,
|
||||
.hljs-section {
|
||||
color: #0030f2;
|
||||
}
|
||||
|
||||
/* Purple */
|
||||
.hljs-keyword,
|
||||
.hljs-selector-tag {
|
||||
color: #9d00ec;
|
||||
}
|
||||
|
||||
.hljs {
|
||||
display: block;
|
||||
overflow-x: auto;
|
||||
background: #f6f7f6;
|
||||
color: #000;
|
||||
padding: 0.5em;
|
||||
}
|
||||
|
||||
.hljs-emphasis {
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
.hljs-strong {
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
.hljs-addition {
|
||||
color: #22863a;
|
||||
background-color: #f0fff4;
|
||||
}
|
||||
|
||||
.hljs-deletion {
|
||||
color: #b31d28;
|
||||
background-color: #ffeef0;
|
||||
}
|
||||
File diff suppressed because one or more lines are too long
File diff suppressed because one or more lines are too long
@ -1,483 +0,0 @@
|
||||
"use strict";
|
||||
window.search = window.search || {};
|
||||
(function search(search) {
|
||||
// Search functionality
|
||||
//
|
||||
// You can use !hasFocus() to prevent keyhandling in your key
|
||||
// event handlers while the user is typing their search.
|
||||
|
||||
if (!Mark || !elasticlunr) {
|
||||
return;
|
||||
}
|
||||
|
||||
//IE 11 Compatibility from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
|
||||
if (!String.prototype.startsWith) {
|
||||
String.prototype.startsWith = function(search, pos) {
|
||||
return this.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
|
||||
};
|
||||
}
|
||||
|
||||
var search_wrap = document.getElementById('search-wrapper'),
|
||||
searchbar = document.getElementById('searchbar'),
|
||||
searchbar_outer = document.getElementById('searchbar-outer'),
|
||||
searchresults = document.getElementById('searchresults'),
|
||||
searchresults_outer = document.getElementById('searchresults-outer'),
|
||||
searchresults_header = document.getElementById('searchresults-header'),
|
||||
searchicon = document.getElementById('search-toggle'),
|
||||
content = document.getElementById('content'),
|
||||
|
||||
searchindex = null,
|
||||
doc_urls = [],
|
||||
results_options = {
|
||||
teaser_word_count: 30,
|
||||
limit_results: 30,
|
||||
},
|
||||
search_options = {
|
||||
bool: "AND",
|
||||
expand: true,
|
||||
fields: {
|
||||
title: {boost: 1},
|
||||
body: {boost: 1},
|
||||
breadcrumbs: {boost: 0}
|
||||
}
|
||||
},
|
||||
mark_exclude = [],
|
||||
marker = new Mark(content),
|
||||
current_searchterm = "",
|
||||
URL_SEARCH_PARAM = 'search',
|
||||
URL_MARK_PARAM = 'highlight',
|
||||
teaser_count = 0,
|
||||
|
||||
SEARCH_HOTKEY_KEYCODE = 83,
|
||||
ESCAPE_KEYCODE = 27,
|
||||
DOWN_KEYCODE = 40,
|
||||
UP_KEYCODE = 38,
|
||||
SELECT_KEYCODE = 13;
|
||||
|
||||
function hasFocus() {
|
||||
return searchbar === document.activeElement;
|
||||
}
|
||||
|
||||
function removeChildren(elem) {
|
||||
while (elem.firstChild) {
|
||||
elem.removeChild(elem.firstChild);
|
||||
}
|
||||
}
|
||||
|
||||
// Helper to parse a url into its building blocks.
|
||||
function parseURL(url) {
|
||||
var a = document.createElement('a');
|
||||
a.href = url;
|
||||
return {
|
||||
source: url,
|
||||
protocol: a.protocol.replace(':',''),
|
||||
host: a.hostname,
|
||||
port: a.port,
|
||||
params: (function(){
|
||||
var ret = {};
|
||||
var seg = a.search.replace(/^\?/,'').split('&');
|
||||
var len = seg.length, i = 0, s;
|
||||
for (;i<len;i++) {
|
||||
if (!seg[i]) { continue; }
|
||||
s = seg[i].split('=');
|
||||
ret[s[0]] = s[1];
|
||||
}
|
||||
return ret;
|
||||
})(),
|
||||
file: (a.pathname.match(/\/([^/?#]+)$/i) || [,''])[1],
|
||||
hash: a.hash.replace('#',''),
|
||||
path: a.pathname.replace(/^([^/])/,'/$1')
|
||||
};
|
||||
}
|
||||
|
||||
// Helper to recreate a url string from its building blocks.
|
||||
function renderURL(urlobject) {
|
||||
var url = urlobject.protocol + "://" + urlobject.host;
|
||||
if (urlobject.port != "") {
|
||||
url += ":" + urlobject.port;
|
||||
}
|
||||
url += urlobject.path;
|
||||
var joiner = "?";
|
||||
for(var prop in urlobject.params) {
|
||||
if(urlobject.params.hasOwnProperty(prop)) {
|
||||
url += joiner + prop + "=" + urlobject.params[prop];
|
||||
joiner = "&";
|
||||
}
|
||||
}
|
||||
if (urlobject.hash != "") {
|
||||
url += "#" + urlobject.hash;
|
||||
}
|
||||
return url;
|
||||
}
|
||||
|
||||
// Helper to escape html special chars for displaying the teasers
|
||||
var escapeHTML = (function() {
|
||||
var MAP = {
|
||||
'&': '&',
|
||||
'<': '<',
|
||||
'>': '>',
|
||||
'"': '"',
|
||||
"'": '''
|
||||
};
|
||||
var repl = function(c) { return MAP[c]; };
|
||||
return function(s) {
|
||||
return s.replace(/[&<>'"]/g, repl);
|
||||
};
|
||||
})();
|
||||
|
||||
function formatSearchMetric(count, searchterm) {
|
||||
if (count == 1) {
|
||||
return count + " search result for '" + searchterm + "':";
|
||||
} else if (count == 0) {
|
||||
return "No search results for '" + searchterm + "'.";
|
||||
} else {
|
||||
return count + " search results for '" + searchterm + "':";
|
||||
}
|
||||
}
|
||||
|
||||
function formatSearchResult(result, searchterms) {
|
||||
var teaser = makeTeaser(escapeHTML(result.doc.body), searchterms);
|
||||
teaser_count++;
|
||||
|
||||
// The ?URL_MARK_PARAM= parameter belongs inbetween the page and the #heading-anchor
|
||||
var url = doc_urls[result.ref].split("#");
|
||||
if (url.length == 1) { // no anchor found
|
||||
url.push("");
|
||||
}
|
||||
|
||||
// encodeURIComponent escapes all chars that could allow an XSS except
|
||||
// for '. Due to that we also manually replace ' with its url-encoded
|
||||
// representation (%27).
|
||||
var searchterms = encodeURIComponent(searchterms.join(" ")).replace(/\'/g, "%27");
|
||||
|
||||
return '<a href="' + path_to_root + url[0] + '?' + URL_MARK_PARAM + '=' + searchterms + '#' + url[1]
|
||||
+ '" aria-details="teaser_' + teaser_count + '">' + result.doc.breadcrumbs + '</a>'
|
||||
+ '<span class="teaser" id="teaser_' + teaser_count + '" aria-label="Search Result Teaser">'
|
||||
+ teaser + '</span>';
|
||||
}
|
||||
|
||||
function makeTeaser(body, searchterms) {
|
||||
// The strategy is as follows:
|
||||
// First, assign a value to each word in the document:
|
||||
// Words that correspond to search terms (stemmer aware): 40
|
||||
// Normal words: 2
|
||||
// First word in a sentence: 8
|
||||
// Then use a sliding window with a constant number of words and count the
|
||||
// sum of the values of the words within the window. Then use the window that got the
|
||||
// maximum sum. If there are multiple maximas, then get the last one.
|
||||
// Enclose the terms in <em>.
|
||||
var stemmed_searchterms = searchterms.map(function(w) {
|
||||
return elasticlunr.stemmer(w.toLowerCase());
|
||||
});
|
||||
var searchterm_weight = 40;
|
||||
var weighted = []; // contains elements of ["word", weight, index_in_document]
|
||||
// split in sentences, then words
|
||||
var sentences = body.toLowerCase().split('. ');
|
||||
var index = 0;
|
||||
var value = 0;
|
||||
var searchterm_found = false;
|
||||
for (var sentenceindex in sentences) {
|
||||
var words = sentences[sentenceindex].split(' ');
|
||||
value = 8;
|
||||
for (var wordindex in words) {
|
||||
var word = words[wordindex];
|
||||
if (word.length > 0) {
|
||||
for (var searchtermindex in stemmed_searchterms) {
|
||||
if (elasticlunr.stemmer(word).startsWith(stemmed_searchterms[searchtermindex])) {
|
||||
value = searchterm_weight;
|
||||
searchterm_found = true;
|
||||
}
|
||||
};
|
||||
weighted.push([word, value, index]);
|
||||
value = 2;
|
||||
}
|
||||
index += word.length;
|
||||
index += 1; // ' ' or '.' if last word in sentence
|
||||
};
|
||||
index += 1; // because we split at a two-char boundary '. '
|
||||
};
|
||||
|
||||
if (weighted.length == 0) {
|
||||
return body;
|
||||
}
|
||||
|
||||
var window_weight = [];
|
||||
var window_size = Math.min(weighted.length, results_options.teaser_word_count);
|
||||
|
||||
var cur_sum = 0;
|
||||
for (var wordindex = 0; wordindex < window_size; wordindex++) {
|
||||
cur_sum += weighted[wordindex][1];
|
||||
};
|
||||
window_weight.push(cur_sum);
|
||||
for (var wordindex = 0; wordindex < weighted.length - window_size; wordindex++) {
|
||||
cur_sum -= weighted[wordindex][1];
|
||||
cur_sum += weighted[wordindex + window_size][1];
|
||||
window_weight.push(cur_sum);
|
||||
};
|
||||
|
||||
if (searchterm_found) {
|
||||
var max_sum = 0;
|
||||
var max_sum_window_index = 0;
|
||||
// backwards
|
||||
for (var i = window_weight.length - 1; i >= 0; i--) {
|
||||
if (window_weight[i] > max_sum) {
|
||||
max_sum = window_weight[i];
|
||||
max_sum_window_index = i;
|
||||
}
|
||||
};
|
||||
} else {
|
||||
max_sum_window_index = 0;
|
||||
}
|
||||
|
||||
// add <em/> around searchterms
|
||||
var teaser_split = [];
|
||||
var index = weighted[max_sum_window_index][2];
|
||||
for (var i = max_sum_window_index; i < max_sum_window_index+window_size; i++) {
|
||||
var word = weighted[i];
|
||||
if (index < word[2]) {
|
||||
// missing text from index to start of `word`
|
||||
teaser_split.push(body.substring(index, word[2]));
|
||||
index = word[2];
|
||||
}
|
||||
if (word[1] == searchterm_weight) {
|
||||
teaser_split.push("<em>")
|
||||
}
|
||||
index = word[2] + word[0].length;
|
||||
teaser_split.push(body.substring(word[2], index));
|
||||
if (word[1] == searchterm_weight) {
|
||||
teaser_split.push("</em>")
|
||||
}
|
||||
};
|
||||
|
||||
return teaser_split.join('');
|
||||
}
|
||||
|
||||
function init(config) {
|
||||
results_options = config.results_options;
|
||||
search_options = config.search_options;
|
||||
searchbar_outer = config.searchbar_outer;
|
||||
doc_urls = config.doc_urls;
|
||||
searchindex = elasticlunr.Index.load(config.index);
|
||||
|
||||
// Set up events
|
||||
searchicon.addEventListener('click', function(e) { searchIconClickHandler(); }, false);
|
||||
searchbar.addEventListener('keyup', function(e) { searchbarKeyUpHandler(); }, false);
|
||||
document.addEventListener('keydown', function(e) { globalKeyHandler(e); }, false);
|
||||
// If the user uses the browser buttons, do the same as if a reload happened
|
||||
window.onpopstate = function(e) { doSearchOrMarkFromUrl(); };
|
||||
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|
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|
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|
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|
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|
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|
||||
|
||||
// Exported functions
|
||||
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|
||||
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|
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File diff suppressed because one or more lines are too long
File diff suppressed because one or more lines are too long
@ -1,192 +0,0 @@
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<!DOCTYPE HTML>
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<head>
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|
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<ol class="chapter"><li class="chapter-item expanded "><a href="../intro/index.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="../ebpf/index.html"><strong aria-hidden="true">2.</strong> eBPF Program Limitiations</a></li><li class="chapter-item expanded "><a href="../start/index.html"><strong aria-hidden="true">3.</strong> Getting Started</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../start/development.html" class="active"><strong aria-hidden="true">3.1.</strong> Development Environment</a></li><li class="chapter-item expanded "><a href="../start/hello-xdp.html"><strong aria-hidden="true">3.2.</strong> Hello XDP!</a></li><li class="chapter-item expanded "><a href="../start/logging-packets.html"><strong aria-hidden="true">3.3.</strong> Logging Packets</a></li></ol></li></ol>
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<h1 class="menu-title">Building eBPF Programs With Aya</h1>
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<div id="content" class="content">
|
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<main>
|
||||
<h1 id="development-environment"><a class="header" href="#development-environment">Development Environment</a></h1>
|
||||
<h2 id="prerequisites"><a class="header" href="#prerequisites">Prerequisites</a></h2>
|
||||
<p>Before getting started you will need the Rust stable and nightly tool-chains installed on your system.
|
||||
This is easily achieved with [<code>rustup</code>]:</p>
|
||||
<pre><code class="language-console">rustup install stable
|
||||
rustup toolchain install nightly --component rust-src
|
||||
</code></pre>
|
||||
<p>Once you have the Rust tool-chains installed, you must also install the <code>bpf-linker</code> - for linking our eBPF program - and <code>cargo-generate</code> - for generating the project skeleton.</p>
|
||||
<pre><code class="language-console">cargo +nightly install bpf-linker
|
||||
cargo install --git https://github.com/cargo-generate/cargo-generate
|
||||
</code></pre>
|
||||
<h2 id="starting-a-new-project"><a class="header" href="#starting-a-new-project">Starting A New Project</a></h2>
|
||||
<p>To start a new project, you can use <code>cargo-generate</code>:</p>
|
||||
<pre><code class="language-console">cargo generate https://github.com/dave-tucker/aya-template
|
||||
</code></pre>
|
||||
<p>This will prompt you for a project name. We'll be using <code>myapp</code> in this example</p>
|
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</main>
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<ol class="chapter"><li class="chapter-item expanded "><a href="../intro/index.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="../ebpf/index.html"><strong aria-hidden="true">2.</strong> eBPF Program Limitiations</a></li><li class="chapter-item expanded "><a href="../start/index.html"><strong aria-hidden="true">3.</strong> Getting Started</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../start/development.html"><strong aria-hidden="true">3.1.</strong> Development Environment</a></li><li class="chapter-item expanded "><a href="../start/hello-xdp.html" class="active"><strong aria-hidden="true">3.2.</strong> Hello XDP!</a></li><li class="chapter-item expanded "><a href="../start/logging-packets.html"><strong aria-hidden="true">3.3.</strong> Logging Packets</a></li></ol></li></ol>
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<h1 class="menu-title">Building eBPF Programs With Aya</h1>
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<main>
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<h1 id="hello-xdp"><a class="header" href="#hello-xdp">Hello XDP!</a></h1>
|
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<h2 id="example-project"><a class="header" href="#example-project">Example Project</a></h2>
|
||||
<p>While there are myriad trace points to attach to and program types to write we should start somewhere simple.</p>
|
||||
<p>XDP (eXpress Data Path) programs permit our eBPF program to make decisions about packets that have been received on the interface to which our program is attached. To keep things simple, we'll build a very simplistic firewall to permit or deny traffic.</p>
|
||||
<h2 id="ebpf-component"><a class="header" href="#ebpf-component">eBPF Component</a></h2>
|
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<h3 id="permit-all"><a class="header" href="#permit-all">Permit All</a></h3>
|
||||
<p>We must first write the eBPF component of our program.
|
||||
The logic for this program is located in <code>myapp-ebpf/src/main.rs</code> and currently looks like this:</p>
|
||||
<pre><code class="language-rust ignore">#![no_std]
|
||||
#![no_main]
|
||||
|
||||
#[panic_handler]
|
||||
fn panic(_info: &core::panic::PanicInfo) -> ! {
|
||||
unreachable!()
|
||||
}
|
||||
</code></pre>
|
||||
<ul>
|
||||
<li><code>#![no_std]</code> is required since we cannot use the standard library.</li>
|
||||
<li><code>#![no_main]</code> is required as we have no main function.</li>
|
||||
<li>The <code>#[panic_handler]</code> is required to keep the compiler happy, although it is never used since we cannot panic.</li>
|
||||
</ul>
|
||||
<p>Let's expand this by adding an XDP program that permits all traffic.</p>
|
||||
<p>First we'll add some imports:</p>
|
||||
<pre><code class="language-rust ignore">use aya_bpf::bindings::xdp_action;
|
||||
use aya_bpf::cty::c_long;
|
||||
use aya_bpf::macros::xdp;
|
||||
use aya_bpf::programs::XdpContext;
|
||||
</code></pre>
|
||||
<p>Then our application logic:</p>
|
||||
<pre><code class="language-rust ignore">#[xdp]
|
||||
pub fn xdp_firewall(ctx: XdpContext) -> u32 {
|
||||
match unsafe { try_xdp_firewall(ctx) } {
|
||||
Ok(ret) => ret,
|
||||
Err(_) => xdp_action::XDP_ABORTED,
|
||||
}
|
||||
}
|
||||
|
||||
unsafe fn try_xdp_firewall(_ctx: XdpContext) -> Result<u32, c_long> {
|
||||
Ok(xdp_action::XDP_PASS)
|
||||
}
|
||||
</code></pre>
|
||||
<ul>
|
||||
<li><code>#[xdp]</code> indicates that this function is an XDP program</li>
|
||||
<li>The <code>try_xdp_firewall</code> function returns a Result that permits all traffic</li>
|
||||
<li>The <code>xdp_firewall</code> program calls <code>try_xdp_firewall</code> and handles any errors by returning <code>XDP_ABORTED</code>, which will drop the packet and raise a tracepoint exception.</li>
|
||||
</ul>
|
||||
<p>Now we can compile this using <code>cargo xtask build-ebpf</code></p>
|
||||
<h3 id="verifying-the-program"><a class="header" href="#verifying-the-program">Verifying The Program</a></h3>
|
||||
<p>Let's take a look at the compiled eBPF program:</p>
|
||||
<pre><code class="language-console">$ llvm-objdump -S target/bpfel-unknown-none/debug/myapp
|
||||
|
||||
target/bpfel-unknown-none/debug/myapp: file format elf64-bpf
|
||||
|
||||
|
||||
Disassembly of section xdp:
|
||||
|
||||
0000000000000000 <xdp_firewall>:
|
||||
0: b7 00 00 00 02 00 00 00 r0 = 2
|
||||
1: 95 00 00 00 00 00 00 00 exit
|
||||
</code></pre>
|
||||
<p>We can see an <code>xdp_firewall</code> section here.
|
||||
<code>r0 = 2</code> sets register <code>0</code> to <code>2</code>, which is the value of the <code>XDP_PASS</code> action.
|
||||
<code>exit</code> ends the program.</p>
|
||||
<p>Simple!</p>
|
||||
<h3 id="completed-program"><a class="header" href="#completed-program">Completed Program</a></h3>
|
||||
<pre><code class="language-rust ignore">#![no_std]
|
||||
#![no_main]
|
||||
|
||||
use aya_bpf::bindings::xdp_action;
|
||||
use aya_bpf::cty::c_long;
|
||||
use aya_bpf::macros::xdp;
|
||||
use aya_bpf::programs::XdpContext;
|
||||
|
||||
#[panic_handler]
|
||||
fn panic(_info: &core::panic::PanicInfo) -> ! {
|
||||
unreachable!()
|
||||
}
|
||||
|
||||
#[xdp]
|
||||
pub fn xdp_firewall(ctx: XdpContext) -> u32 {
|
||||
match unsafe { try_xdp_firewall(ctx) } {
|
||||
Ok(ret) => ret,
|
||||
Err(_) => xdp_action::XDP_ABORTED,
|
||||
}
|
||||
}
|
||||
|
||||
unsafe fn try_xdp_firewall(_ctx: XdpContext) -> Result<u32, c_long> {
|
||||
Ok(xdp_action::XDP_PASS)
|
||||
}
|
||||
</code></pre>
|
||||
<h2 id="user-space-component"><a class="header" href="#user-space-component">User-space Component</a></h2>
|
||||
<p>Now our eBPF program is complete and compiled, we need a user-space program to load it and attach it to a trace point.
|
||||
Fortunately, we have a program ready in <code>myapp/src/main.rs</code> which is going to do that for us.</p>
|
||||
<h3 id="starting-out"><a class="header" href="#starting-out">Starting Out</a></h3>
|
||||
<p>The generated application has the following content:</p>
|
||||
<pre><code class="language-rust ignore">fn main() {
|
||||
if let Err(e) = try_main() {
|
||||
eprintln!("error: {:#}", e);
|
||||
}
|
||||
}
|
||||
|
||||
fn try_main() -> Result<(), anyhow::Error> {
|
||||
Ok(())
|
||||
}
|
||||
</code></pre>
|
||||
<p>Let's adapt it to load our program.</p>
|
||||
<p>We will add a dependency on <code>ctrlc = "3.2"</code> to <code>myapp/Cargo.toml</code>, then add the following imports at the top of the <code>myapp/src/main.rs</code>:</p>
|
||||
<pre><code class="language-rust ignore">use aya::Bpf;
|
||||
use aya::programs::{Xdp, XdpFlags};
|
||||
use std::{
|
||||
convert::TryInto,
|
||||
env,
|
||||
thread,
|
||||
time::Duration,
|
||||
sync::Arc,
|
||||
sync::atomic::{AtomicBool, Ordering},
|
||||
};
|
||||
</code></pre>
|
||||
<p>Then we'll adapt the <code>try_main</code> function to load our program:</p>
|
||||
<pre><code class="language-rust ignore">fn try_main() -> Result<(), anyhow::Error> {
|
||||
let path = match env::args().nth(1) {
|
||||
Some(iface) => iface,
|
||||
None => panic!("not path provided"),
|
||||
};
|
||||
let iface = match env::args().nth(2) {
|
||||
Some(iface) => iface,
|
||||
None => "eth0".to_string(),
|
||||
};
|
||||
let mut bpf = Bpf::load_file(&path)?;
|
||||
let probe: &mut Xdp = bpf.program_mut("xdp")?.try_into()?;
|
||||
probe.load()?;
|
||||
probe.attach(&iface, XdpFlags::default())?;
|
||||
|
||||
let running = Arc::new(AtomicBool::new(true));
|
||||
let r = running.clone();
|
||||
|
||||
ctrlc::set_handler(move || {
|
||||
r.store(false, Ordering::SeqCst);
|
||||
}).expect("Error setting Ctrl-C handler");
|
||||
|
||||
println!("Waiting for Ctrl-C...");
|
||||
while running.load(Ordering::SeqCst) {}
|
||||
println!("Exiting...");
|
||||
|
||||
Ok(())
|
||||
}
|
||||
</code></pre>
|
||||
<p>The program takes two positional arguments</p>
|
||||
<ul>
|
||||
<li>The path to our eBPF application</li>
|
||||
<li>The interface we wish to attach it to (defaults to <code>eth0</code>)</li>
|
||||
</ul>
|
||||
<p>The line <code>let mut bpf = Bpf::load_file(&path)?;</code>:</p>
|
||||
<ul>
|
||||
<li>Opens the file</li>
|
||||
<li>Reads the ELF contents</li>
|
||||
<li>Creates any maps</li>
|
||||
<li>If your system supports BPF Type Format (BTF), it will read the current BTF description and performs any necessary relocations</li>
|
||||
</ul>
|
||||
<p>Once our file is loaded, we can extract the XDP probe with <code>let probe: &mut Xdp = bpf.program_mut("xdp")?.try_into()?;</code> and then load it in to the kernel with <code>probe.load()</code>.</p>
|
||||
<p>Finally, we can attach it to an interface with <code>probe.attach(&iface, XdpFlags::default())?;</code></p>
|
||||
<p>Let's try it out!</p>
|
||||
<pre><code class="language-console">$ cargo build
|
||||
$ sudo ./target/debug/myapp ./target/bpfel-unknown-none/debug/myapp wlp2s0
|
||||
Waiting for Ctrl-C...
|
||||
Exiting...
|
||||
</code></pre>
|
||||
<p>That was uneventful. Did it work?</p>
|
||||
<blockquote>
|
||||
<p>💡 <strong>HINT: Error Loading Program?</strong></p>
|
||||
<p>If you get an error loading the program, try changing <code>XdpFlags::default()</code> to <code>XdpFlags::SKB_MODE</code></p>
|
||||
</blockquote>
|
||||
<h3 id="the-lifecycle-of-an-ebpf-program"><a class="header" href="#the-lifecycle-of-an-ebpf-program">The Lifecycle of an eBPF Program</a></h3>
|
||||
<p>The program runs until CTRL+C is pressed and then exits.
|
||||
On exit, Aya takes care of detaching the program for us.</p>
|
||||
<p>If you issue the <code>sudo bpftool prog list</code> command when <code>myapp</code> is running you can verify that it is loaded:</p>
|
||||
<pre><code class="language-console">84: xdp tag 3b185187f1855c4c gpl
|
||||
loaded_at 2021-08-05T13:35:06+0100 uid 0
|
||||
xlated 16B jited 18B memlock 4096B
|
||||
pids myapp(69184)
|
||||
</code></pre>
|
||||
<p>Running the command again once <code>myapp</code> has exited will show that the program is no longer running.</p>
|
||||
|
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<h1 id="logging-packets"><a class="header" href="#logging-packets">Logging Packets</a></h1>
|
||||
<p>In the previous chapter, our XDP application ran for 10 seconds and permitted some traffic.
|
||||
There was however no output on the console, so you just have to trust that it was working correctly. Let's expand this program to log the traffic that is being permitted</p>
|
||||
<h2 id="getting-data-to-user-space"><a class="header" href="#getting-data-to-user-space">Getting Data to User-Space</a></h2>
|
||||
<h3 id="sharing-data"><a class="header" href="#sharing-data">Sharing Data</a></h3>
|
||||
<p>To get data from kernel-space to user-space we use an eBPF map. There are numerous types of maps to chose from, but in this example we'll be using a PerfEventArray.</p>
|
||||
<p>While we could go all out and extract data all the way up to L7, we'll constrain our firewall to L3, and to make things easier, IPv4 only.
|
||||
The data structure that we'll need to send information to user-space will need to hold an IPv4 address and an action for Permit/Deny, we'll encode both as a <code>u32</code>.</p>
|
||||
<p>Let's go ahead and add that to <code>myapp-common/src/lib.rs</code></p>
|
||||
<pre><code class="language-rust ignore">#[repr(C)]
|
||||
pub struct PacketLog {
|
||||
pub ipv4_address: u32,
|
||||
pub action: u32,
|
||||
}
|
||||
|
||||
#[cfg(feature = "user")]
|
||||
unsafe impl aya::Pod for PacketLog {}
|
||||
</code></pre>
|
||||
<blockquote>
|
||||
<p>💡 <strong>HINT: Struct Alignment</strong></p>
|
||||
<p>Structs must be aligned to 8 byte boundaries. You can do this manually, or alternatively you may use <code>#[repr(packed)]</code>. If you do not do this, the eBPF verifier will get upset and emit an <code>invalid indirect read from stack</code> error.</p>
|
||||
</blockquote>
|
||||
<p>We implement the <code>aya::Pod</code> trait for our struct since it is Plain Old Data as can be safely converted to a byte-slice and back.</p>
|
||||
<h3 id="ebpf-map-creation"><a class="header" href="#ebpf-map-creation">eBPF: Map Creation</a></h3>
|
||||
<p>Let's create a map called <code>EVENTS</code> in <code>myapp-ebpf/src/main.rs</code></p>
|
||||
<pre><code class="language-rust ignore">use aya_bpf::macros::map;
|
||||
use aya_bpf::maps::PerfMap;
|
||||
use myapp_common::PacketLog;
|
||||
|
||||
#[map(name = "EVENTS")]
|
||||
static mut EVENTS: PerfMap<PacketLog> = PerfMap::<PacketLog>::with_max_entries(1024, 0);
|
||||
</code></pre>
|
||||
<p>When the eBPF program is loaded by Aya, the map will be created for us.</p>
|
||||
<h3 id="userspace-map-creation"><a class="header" href="#userspace-map-creation">Userspace: Map Creation</a></h3>
|
||||
<p>After our call to <code>probe.attach()</code> we'll add the following code.</p>
|
||||
<pre><code class="language-rust ignore">use aya::maps::AsyncPerfEventArray;
|
||||
|
||||
let mut perf_array = AsyncPerfEventArray::try_from(bpf.map_mut("EVENTS")?)?;
|
||||
</code></pre>
|
||||
<p>Our <code>perf_array</code> is a mutable reference to the map that was created after the XDP program was loaded by Aya.</p>
|
||||
<h2 id="writing-data"><a class="header" href="#writing-data">Writing Data</a></h2>
|
||||
<p>Now we've got our maps set up, let's add some data!</p>
|
||||
<h3 id="generating-bindings-to-vmlinuxh"><a class="header" href="#generating-bindings-to-vmlinuxh">Generating Bindings To vmlinux.h</a></h3>
|
||||
<p>To get useful data to add to our maps, we first need some useful data structures to populate with data from the <code>XdpContext</code>.
|
||||
We want to log the Source IP Address of incoming traffic, so we'll need to:</p>
|
||||
<ol>
|
||||
<li>Read the Ethernet Header to determine if this is an IPv4 Packet</li>
|
||||
<li>Read the Source IP Address from the IPv4 Header</li>
|
||||
</ol>
|
||||
<p>The two structs in the kernel for this are <code>ethhdr</code> from <code>uapi/linux/if_ether.h</code> and <code>iphdr</code> from <code>uapi/linux/ip.h</code>.
|
||||
If I were to use bindgen to generate Rust bindings for those headers, I'd be tied to the kernel version of the system that I'm developing on.
|
||||
This is where <code>aya-gen</code> comes in to play. It can easily generate bindings for using the BTF information in <code>/sys/kernel/btf/vmlinux</code>.</p>
|
||||
<p>Once the bindings are generated and checked in to our repository they shouldn't need to be regenerated again unless we need to add a new struct.</p>
|
||||
<p>Lets use <code>xtask</code> to automate this so we can easily reproduce this file in future.</p>
|
||||
<p>We'll add the following content to <code>xtask/src/codegen.rs</code></p>
|
||||
<pre><code class="language-rust ignore">use aya_gen::btf_types;
|
||||
use std::{
|
||||
fs::File,
|
||||
io::Write,
|
||||
path::{Path, PathBuf},
|
||||
};
|
||||
|
||||
pub fn generate() -> Result<(), anyhow::Error> {
|
||||
let dir = PathBuf::from("myapp-ebpf/src");
|
||||
let names: Vec<&str> = vec!["ethhdr", "iphdr"];
|
||||
let bindings = btf_types::generate(Path::new("/sys/kernel/btf/vmlinux"), &names, false)?;
|
||||
// Write the bindings to the $OUT_DIR/bindings.rs file.
|
||||
let mut out = File::create(dir.join("bindings.rs"))?;
|
||||
write!(out, "{}", bindings).expect("unable to write bindings to file");
|
||||
Ok(())
|
||||
}
|
||||
</code></pre>
|
||||
<p>This will generate a file called <code>myapp-ebpf/src/bindings.rs</code>. If you've chosen an application name other than <code>myapp</code> you'll need to adjust the path appropriately.</p>
|
||||
<p>Add a new dependencies to <code>xtask/Cargo.toml</code>:</p>
|
||||
<pre><code class="language-toml">[dependencies]
|
||||
aya-gen = { git = "http://github.com/alessandrod/aya", branch = "main" }
|
||||
</code></pre>
|
||||
<p>And finally, we must register the command in <code>xtask/src/main.rs</code>:</p>
|
||||
<pre><code class="language-rust ignore">mod build_ebpf;
|
||||
mod codegen;
|
||||
|
||||
use std::process::exit;
|
||||
|
||||
use structopt::StructOpt;
|
||||
#[derive(StructOpt)]
|
||||
pub struct Options {
|
||||
#[structopt(subcommand)]
|
||||
command: Command,
|
||||
}
|
||||
|
||||
#[derive(StructOpt)]
|
||||
enum Command {
|
||||
BuildEbpf(build_ebpf::Options),
|
||||
Codegen,
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let opts = Options::from_args();
|
||||
|
||||
use Command::*;
|
||||
let ret = match opts.command {
|
||||
BuildEbpf(opts) => build_ebpf::build(opts),
|
||||
Codegen => codegen::generate(),
|
||||
};
|
||||
|
||||
if let Err(e) = ret {
|
||||
eprintln!("{:#}", e);
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
</code></pre>
|
||||
<p>Once we've generated our file using <code>cargo xtask codegen</code> from the root of the project.</p>
|
||||
<p>These can then be accessed from within <code>myapp-ebpf/src/main.rs</code>:</p>
|
||||
<pre><code class="language-rust ignore">mod bindings;
|
||||
use bindings::{ethhdr, iphdr};
|
||||
</code></pre>
|
||||
<h3 id="getting-packet-data-from-the-context"><a class="header" href="#getting-packet-data-from-the-context">Getting Packet Data From The Context</a></h3>
|
||||
<p>The <code>XdpContext</code> contains two fields, <code>data</code> and <code>data_end</code>.
|
||||
<code>data</code> is a pointer to the start of the data in kernel memory and <code>data_end</code>, a pointer to the end of the data in kernel memory. In order to access this data and ensure that the eBPF verifier is happy, we'll introduce a helper function:</p>
|
||||
<pre><code class="language-rust ignore">#[inline(always)]
|
||||
unsafe fn ptr_at<T>(ctx: &XdpContext, offset: usize) -> Result<*const T, ()> {
|
||||
let start = ctx.data();
|
||||
let end = ctx.data_end();
|
||||
let len = mem::size_of::<T>();
|
||||
|
||||
if start + offset + len > end {
|
||||
return Err(());
|
||||
}
|
||||
|
||||
Ok((start + offset) as *const T)
|
||||
}
|
||||
</code></pre>
|
||||
<p>This function will ensure that before we access any data, we check that it's contained between <code>data</code> and <code>data_end</code>.
|
||||
It is marked as <code>unsafe</code> because when calling the function, you must ensure that there is a valid <code>T</code> at that location or there will be undefined behaviour.</p>
|
||||
<h3 id="writing-data-to-the-map"><a class="header" href="#writing-data-to-the-map">Writing Data To The Map</a></h3>
|
||||
<p>With our helper function in place, we can:</p>
|
||||
<ol>
|
||||
<li>Read the Ethertype field to check if we have an IPv4 packet.</li>
|
||||
<li>Read the IPv4 Source Address from the IP header</li>
|
||||
</ol>
|
||||
<p>First let's add another dependency on <code>memoffset = "0.6"</code> to <code>myapp-ebpf/Cargo.toml</code>, and then we'll change our <code>try_xdp_firewall</code> function to look like this:</p>
|
||||
<pre><code class="language-rust ignore">use memoffset::offset_of;
|
||||
|
||||
fn try_xdp_firewall(ctx: XdpContext) -> Result<u32, ()> {
|
||||
let h_proto = u16::from_be(unsafe { *ptr_at(&ctx, offset_of!(ethhdr, h_proto))? });
|
||||
if h_proto != ETH_P_IP {
|
||||
return Ok(xdp_action::XDP_PASS)
|
||||
}
|
||||
let source = u32::from_be(unsafe { *ptr_at(&ctx, ETH_HDR_LEN + offset_of!(iphdr, saddr))? });
|
||||
|
||||
let log_entry = PacketLog{
|
||||
ipv4_address: source,
|
||||
action: xdp_action::XDP_PASS,
|
||||
};
|
||||
unsafe { EVENTS.output(&ctx, &log_entry, 0); }
|
||||
Ok(xdp_action::XDP_PASS)
|
||||
}
|
||||
</code></pre>
|
||||
<blockquote>
|
||||
<p>💡 <strong>HINT: Reading Fields Using <code>offset_of!</code></strong></p>
|
||||
<p>As there is limited stack space, it's more memory efficient to use the <code>offset_of!</code> macro to read
|
||||
a single field from a struct, rather than reading the whole struct and accessing the field by name.</p>
|
||||
</blockquote>
|
||||
<p>Once we have our IPv4 source address, we can create a <code>PacketLog</code> struct and output this to our PerfEventArray</p>
|
||||
<h2 id="reading-data"><a class="header" href="#reading-data">Reading Data</a></h2>
|
||||
<h3 id="going-async"><a class="header" href="#going-async">Going Async</a></h3>
|
||||
<p>In order to read from the <code>AsyncPerfEventArray</code>, we have to call <code>AsyncPerfEventArray::open()</code> for each online CPU, then we have to poll the file descriptor for events.
|
||||
While this is do-able using <code>PerfEventArray</code> and <code>mio</code> or <code>epoll</code>, the code is much less easy to follow. Instead, we'll use <code>tokio</code> to make our user-space application async.</p>
|
||||
<p>Let's add some dependencies to <code>myapp/src/Cargo.toml</code>:</p>
|
||||
<pre><code class="language-toml">[dependencies]
|
||||
aya = { git = "https://github.com/alessandrod/aya", branch="main", features=["async_tokio"] }
|
||||
myapp-common = { path = "../myapp-common", features=["userspace"] }
|
||||
anyhow = "1.0.42"
|
||||
bytes = "1"
|
||||
tokio = { version = "1.9.0", features = ["full"] }
|
||||
</code></pre>
|
||||
<p>And adjust our <code>myapp/src/main.rs</code> to look like this:</p>
|
||||
<pre><code class="language-rust ignore">use aya::{
|
||||
maps::perf::AsyncPerfEventArray,
|
||||
programs::{Xdp, XdpFlags},
|
||||
util::online_cpus,
|
||||
Bpf,
|
||||
};
|
||||
use bytes::BytesMut;
|
||||
use std::{
|
||||
convert::{TryFrom, TryInto},
|
||||
env, fs, net,
|
||||
};
|
||||
use tokio::{signal, task};
|
||||
|
||||
use myapp_common::PacketLog;
|
||||
|
||||
#[tokio::main]
|
||||
async fn main() -> Result<(), anyhow::Error> {
|
||||
let path = match env::args().nth(1) {
|
||||
Some(iface) => iface,
|
||||
None => panic!("not path provided"),
|
||||
};
|
||||
let iface = match env::args().nth(2) {
|
||||
Some(iface) => iface,
|
||||
None => "eth0".to_string(),
|
||||
};
|
||||
|
||||
let data = fs::read(path)?;
|
||||
let mut bpf = Bpf::load(&data, None)?;
|
||||
|
||||
let probe: &mut Xdp = bpf.program_mut("xdp")?.try_into()?;
|
||||
probe.load()?;
|
||||
probe.attach(&iface, XdpFlags::default())?;
|
||||
|
||||
let mut perf_array = AsyncPerfEventArray::try_from(bpf.map_mut("EVENTS")?)?;
|
||||
|
||||
for cpu_id in online_cpus()? {
|
||||
let mut buf = perf_array.open(cpu_id, None)?;
|
||||
task::spawn(async move {
|
||||
let mut buffers = (0..10)
|
||||
.map(|_| BytesMut::with_capacity(1024))
|
||||
.collect::<Vec<_>>();
|
||||
|
||||
loop {
|
||||
let events = buf.read_events(&mut buffers).await.unwrap();
|
||||
for i in 0..events.read {
|
||||
let buf = &mut buffers[i];
|
||||
let ptr = buf.as_ptr() as *const PacketLog;
|
||||
let data = unsafe { ptr.read_unaligned() };
|
||||
let src_addr = net::Ipv4Addr::from(data.ipv4_address);
|
||||
println!("LOG: SRC {}, ACTION {}", src_addr, data.action);
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
signal::ctrl_c().await.expect("failed to listen for event");
|
||||
Ok::<_, anyhow::Error>(())
|
||||
}
|
||||
</code></pre>
|
||||
<p>This will now spawn a <code>tokio::task</code> to read each of the <code>AsyncPerfEventArrayBuffers</code> contained in out <code>AsyncPerfEventArray</code>.
|
||||
When we receive an event, we use <code>read_unaligned</code> to read our data into a <code>PacketLog</code>.
|
||||
We then use <code>println!</code> to log the event to the console.
|
||||
We no longer need to sleep, as we run until we receive the <code>CTRL+C</code> signal.</p>
|
||||
<h2 id="running-the-program"><a class="header" href="#running-the-program">Running the program</a></h2>
|
||||
<pre><code class="language-console">$ cargo build
|
||||
$ cargo xtask build-ebpf
|
||||
$ sudo ./target/debug/myapp ./target/bpfel-unknown-none/debug/myapp wlp2s0
|
||||
LOG: SRC 192.168.1.205, ACTION 2
|
||||
LOG: SRC 192.168.1.21, ACTION 2
|
||||
LOG: SRC 192.168.1.21, ACTION 2
|
||||
LOG: SRC 18.168.253.132, ACTION 2
|
||||
LOG: SRC 18.168.253.132, ACTION 2
|
||||
LOG: SRC 18.168.253.132, ACTION 2
|
||||
LOG: SRC 140.82.121.6, ACTION 2
|
||||
</code></pre>
|
||||
|
||||
</main>
|
||||
|
||||
<nav class="nav-wrapper" aria-label="Page navigation">
|
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<a rel="prev" href="../start/hello-xdp.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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window.playground_copyable = true;
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</body>
|
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</html>
|
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@ -1,104 +0,0 @@
|
||||
/* Tomorrow Night Theme */
|
||||
/* http://jmblog.github.com/color-themes-for-google-code-highlightjs */
|
||||
/* Original theme - https://github.com/chriskempson/tomorrow-theme */
|
||||
/* http://jmblog.github.com/color-themes-for-google-code-highlightjs */
|
||||
|
||||
/* Tomorrow Comment */
|
||||
.hljs-comment {
|
||||
color: #969896;
|
||||
}
|
||||
|
||||
/* Tomorrow Red */
|
||||
.hljs-variable,
|
||||
.hljs-attribute,
|
||||
.hljs-tag,
|
||||
.hljs-regexp,
|
||||
.ruby .hljs-constant,
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|
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.html .hljs-doctype,
|
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.css .hljs-id,
|
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.css .hljs-class,
|
||||
.css .hljs-pseudo {
|
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color: #cc6666;
|
||||
}
|
||||
|
||||
/* Tomorrow Orange */
|
||||
.hljs-number,
|
||||
.hljs-preprocessor,
|
||||
.hljs-pragma,
|
||||
.hljs-built_in,
|
||||
.hljs-literal,
|
||||
.hljs-params,
|
||||
.hljs-constant {
|
||||
color: #de935f;
|
||||
}
|
||||
|
||||
/* Tomorrow Yellow */
|
||||
.ruby .hljs-class .hljs-title,
|
||||
.css .hljs-rule .hljs-attribute {
|
||||
color: #f0c674;
|
||||
}
|
||||
|
||||
/* Tomorrow Green */
|
||||
.hljs-string,
|
||||
.hljs-value,
|
||||
.hljs-inheritance,
|
||||
.hljs-header,
|
||||
.hljs-name,
|
||||
.ruby .hljs-symbol,
|
||||
.xml .hljs-cdata {
|
||||
color: #b5bd68;
|
||||
}
|
||||
|
||||
/* Tomorrow Aqua */
|
||||
.hljs-title,
|
||||
.css .hljs-hexcolor {
|
||||
color: #8abeb7;
|
||||
}
|
||||
|
||||
/* Tomorrow Blue */
|
||||
.hljs-function,
|
||||
.python .hljs-decorator,
|
||||
.python .hljs-title,
|
||||
.ruby .hljs-function .hljs-title,
|
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.ruby .hljs-title .hljs-keyword,
|
||||
.perl .hljs-sub,
|
||||
.javascript .hljs-title,
|
||||
.coffeescript .hljs-title {
|
||||
color: #81a2be;
|
||||
}
|
||||
|
||||
/* Tomorrow Purple */
|
||||
.hljs-keyword,
|
||||
.javascript .hljs-function {
|
||||
color: #b294bb;
|
||||
}
|
||||
|
||||
.hljs {
|
||||
display: block;
|
||||
overflow-x: auto;
|
||||
background: #1d1f21;
|
||||
color: #c5c8c6;
|
||||
padding: 0.5em;
|
||||
-webkit-text-size-adjust: none;
|
||||
}
|
||||
|
||||
.coffeescript .javascript,
|
||||
.javascript .xml,
|
||||
.tex .hljs-formula,
|
||||
.xml .javascript,
|
||||
.xml .vbscript,
|
||||
.xml .css,
|
||||
.xml .hljs-cdata {
|
||||
opacity: 0.5;
|
||||
}
|
||||
|
||||
.hljs-addition {
|
||||
color: #718c00;
|
||||
}
|
||||
|
||||
.hljs-deletion {
|
||||
color: #c82829;
|
||||
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|
||||
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Reference in New Issue