netwerk/sctp/src/user_route.h@97036ab72558 (annotated)
netwerk/sctp/src/user_route.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rwxr-xr-x
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /*- |
| michael@0 | 2 | * Copyright (c) 1980, 1986, 1993 |
| michael@0 | 3 | * The Regents of the University of California. All rights reserved. |
| michael@0 | 4 | * |
| michael@0 | 5 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 6 | * modification, are permitted provided that the following conditions |
| michael@0 | 7 | * are met: |
| michael@0 | 8 | * 1. Redistributions of source code must retain the above copyright |
| michael@0 | 9 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| michael@0 | 11 | * notice, this list of conditions and the following disclaimer in the |
| michael@0 | 12 | * documentation and/or other materials provided with the distribution. |
| michael@0 | 13 | * 4. Neither the name of the University nor the names of its contributors |
| michael@0 | 14 | * may be used to endorse or promote products derived from this software |
| michael@0 | 15 | * without specific prior written permission. |
| michael@0 | 16 | * |
| michael@0 | 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| michael@0 | 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| michael@0 | 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| michael@0 | 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| michael@0 | 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| michael@0 | 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| michael@0 | 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| michael@0 | 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| michael@0 | 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| michael@0 | 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| michael@0 | 27 | * SUCH DAMAGE. |
| michael@0 | 28 | * |
| michael@0 | 29 | */ |
| michael@0 | 30 | |
| michael@0 | 31 | #ifndef _USER_ROUTE_H_ |
| michael@0 | 32 | #define _USER_ROUTE_H_ |
| michael@0 | 33 | |
| michael@0 | 34 | /* |
| michael@0 | 35 | * Kernel resident routing tables. |
| michael@0 | 36 | * |
| michael@0 | 37 | * The routing tables are initialized when interface addresses |
| michael@0 | 38 | * are set by making entries for all directly connected interfaces. |
| michael@0 | 39 | */ |
| michael@0 | 40 | |
| michael@0 | 41 | /* |
| michael@0 | 42 | * A route consists of a destination address and a reference |
| michael@0 | 43 | * to a routing entry. These are often held by protocols |
| michael@0 | 44 | * in their control blocks, e.g. inpcb. |
| michael@0 | 45 | */ |
| michael@0 | 46 | |
| michael@0 | 47 | struct sctp_route { |
| michael@0 | 48 | struct sctp_rtentry *ro_rt; |
| michael@0 | 49 | struct sockaddr ro_dst; |
| michael@0 | 50 | }; |
| michael@0 | 51 | |
| michael@0 | 52 | /* |
| michael@0 | 53 | * These numbers are used by reliable protocols for determining |
| michael@0 | 54 | * retransmission behavior and are included in the routing structure. |
| michael@0 | 55 | */ |
| michael@0 | 56 | struct sctp_rt_metrics_lite { |
| michael@0 | 57 | u_long rmx_mtu; /* MTU for this path */ |
| michael@0 | 58 | #if 0 |
| michael@0 | 59 | u_long rmx_expire; /* lifetime for route, e.g. redirect */ |
| michael@0 | 60 | u_long rmx_pksent; /* packets sent using this route */ |
| michael@0 | 61 | #endif |
| michael@0 | 62 | }; |
| michael@0 | 63 | |
| michael@0 | 64 | /* |
| michael@0 | 65 | * We distinguish between routes to hosts and routes to networks, |
| michael@0 | 66 | * preferring the former if available. For each route we infer |
| michael@0 | 67 | * the interface to use from the gateway address supplied when |
| michael@0 | 68 | * the route was entered. Routes that forward packets through |
| michael@0 | 69 | * gateways are marked so that the output routines know to address the |
| michael@0 | 70 | * gateway rather than the ultimate destination. |
| michael@0 | 71 | */ |
| michael@0 | 72 | struct sctp_rtentry { |
| michael@0 | 73 | #if 0 |
| michael@0 | 74 | struct radix_node rt_nodes[2]; /* tree glue, and other values */ |
| michael@0 | 75 | /* |
| michael@0 | 76 | * XXX struct rtentry must begin with a struct radix_node (or two!) |
| michael@0 | 77 | * because the code does some casts of a 'struct radix_node *' |
| michael@0 | 78 | * to a 'struct rtentry *' |
| michael@0 | 79 | */ |
| michael@0 | 80 | #define rt_key(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_key))) |
| michael@0 | 81 | #define rt_mask(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_mask))) |
| michael@0 | 82 | struct sockaddr *rt_gateway; /* value */ |
| michael@0 | 83 | u_long rt_flags; /* up/down?, host/net */ |
| michael@0 | 84 | #endif |
| michael@0 | 85 | struct ifnet *rt_ifp; /* the answer: interface to use */ |
| michael@0 | 86 | struct ifaddr *rt_ifa; /* the answer: interface address to use */ |
| michael@0 | 87 | struct sctp_rt_metrics_lite rt_rmx; /* metrics used by rx'ing protocols */ |
| michael@0 | 88 | long rt_refcnt; /* # held references */ |
| michael@0 | 89 | #if 0 |
| michael@0 | 90 | struct sockaddr *rt_genmask; /* for generation of cloned routes */ |
| michael@0 | 91 | caddr_t rt_llinfo; /* pointer to link level info cache */ |
| michael@0 | 92 | struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */ |
| michael@0 | 93 | struct rtentry *rt_parent; /* cloning parent of this route */ |
| michael@0 | 94 | #endif |
| michael@0 | 95 | struct mtx rt_mtx; /* mutex for routing entry */ |
| michael@0 | 96 | }; |
| michael@0 | 97 | |
| michael@0 | 98 | #define RT_LOCK_INIT(_rt) mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK) |
| michael@0 | 99 | #define RT_LOCK(_rt) mtx_lock(&(_rt)->rt_mtx) |
| michael@0 | 100 | #define RT_UNLOCK(_rt) mtx_unlock(&(_rt)->rt_mtx) |
| michael@0 | 101 | #define RT_LOCK_DESTROY(_rt) mtx_destroy(&(_rt)->rt_mtx) |
| michael@0 | 102 | #define RT_LOCK_ASSERT(_rt) mtx_assert(&(_rt)->rt_mtx, MA_OWNED) |
| michael@0 | 103 | |
| michael@0 | 104 | #define RT_ADDREF(_rt) do { \ |
| michael@0 | 105 | RT_LOCK_ASSERT(_rt); \ |
| michael@0 | 106 | KASSERT((_rt)->rt_refcnt >= 0, \ |
| michael@0 | 107 | ("negative refcnt %ld", (_rt)->rt_refcnt)); \ |
| michael@0 | 108 | (_rt)->rt_refcnt++; \ |
| michael@0 | 109 | } while (0) |
| michael@0 | 110 | #define RT_REMREF(_rt) do { \ |
| michael@0 | 111 | RT_LOCK_ASSERT(_rt); \ |
| michael@0 | 112 | KASSERT((_rt)->rt_refcnt > 0, \ |
| michael@0 | 113 | ("bogus refcnt %ld", (_rt)->rt_refcnt)); \ |
| michael@0 | 114 | (_rt)->rt_refcnt--; \ |
| michael@0 | 115 | } while (0) |
| michael@0 | 116 | #define RTFREE_LOCKED(_rt) do { \ |
| michael@0 | 117 | if ((_rt)->rt_refcnt <= 1) { \ |
| michael@0 | 118 | rtfree(_rt); \ |
| michael@0 | 119 | } else { \ |
| michael@0 | 120 | RT_REMREF(_rt); \ |
| michael@0 | 121 | RT_UNLOCK(_rt); \ |
| michael@0 | 122 | } \ |
| michael@0 | 123 | /* guard against invalid refs */ \ |
| michael@0 | 124 | _rt = NULL; \ |
| michael@0 | 125 | } while (0) |
| michael@0 | 126 | #define RTFREE(_rt) do { \ |
| michael@0 | 127 | RT_LOCK(_rt); \ |
| michael@0 | 128 | RTFREE_LOCKED(_rt); \ |
| michael@0 | 129 | } while (0) |
| michael@0 | 130 | #endif |
