Implements multiple routing table support for FreeBSD and OpenBSD.
Inspired by the patch from Alexander V. Chernikov.
This commit is contained in:
Ondrej Zajicek
parent
c6964c305b
commit
c01a94663c
6 changed files with 422 additions and 92 deletions
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@ -1,3 +1,4 @@
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krt-sock.c
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krt-sock.Y
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krt-sys.h
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sysio.h
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32
sysdep/bsd/krt-sock.Y
Normal file
32
sysdep/bsd/krt-sock.Y
Normal file
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@ -0,0 +1,32 @@
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/*
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* BIRD -- BSD Kernel Syncer Configuration
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*
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* (c) 1999--2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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CF_HDR
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CF_DECLS
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CF_KEYWORDS(KERNEL, TABLE)
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CF_GRAMMAR
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CF_ADDTO(kern_proto, kern_proto kern_sys_item ';')
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kern_sys_item:
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KERNEL TABLE expr {
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if ($3 && (krt_max_tables == 1))
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cf_error("Multiple kernel routing tables not supported");
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if ($3 < 0 || $3 >= krt_max_tables)
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cf_error("Kernel table id must be in range 0-%d", krt_max_tables - 1);
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THIS_KRT->sys.table_id = $3;
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}
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;
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CF_CODE
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CF_END
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@ -1,5 +1,5 @@
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/*
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* BIRD -- Unix Routing Table Syncing
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* BIRD -- BSD Routing Table Syncing
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*
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* (c) 2004 Ondrej Filip <feela@network.cz>
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*
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@ -7,6 +7,7 @@
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <unistd.h>
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@ -34,18 +35,112 @@
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#include "lib/socket.h"
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#ifndef RTAX_MAX
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#define RTAX_MAX 8
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/*
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* There are significant differences in multiple tables support between BSD variants.
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*
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* OpenBSD has table_id field for routes in route socket protocol, therefore all
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* tables could be managed by one kernel socket. FreeBSD lacks such field,
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* therefore multiple sockets (locked to specific table using SO_SETFIB socket
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* option) must be used.
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*
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* Both FreeBSD and OpenBSD uses separate scans for each table. In OpenBSD,
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* table_id is specified explicitly as sysctl scan argument, while in FreeBSD it
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* is handled implicitly by changing default table using setfib() syscall.
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*
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* KRT_SHARED_SOCKET - use shared kernel socked instead of one for each krt_proto
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* KRT_USE_SETFIB_SCAN - use setfib() for sysctl() route scan
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* KRT_USE_SETFIB_SOCK - use SO_SETFIB socket option for kernel sockets
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* KRT_USE_SYSCTL_7 - use 7-th arg of sysctl() as table id for route scans
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* KRT_USE_SYSCTL_NET_FIBS - use net.fibs sysctl() for dynamic max number of fibs
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*/
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#ifdef __FreeBSD__
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#define KRT_MAX_TABLES 256
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#define KRT_USE_SETFIB_SCAN
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#define KRT_USE_SETFIB_SOCK
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#define KRT_USE_SYSCTL_NET_FIBS
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#endif
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struct ks_msg
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#ifdef __OpenBSD__
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#define KRT_MAX_TABLES (RT_TABLEID_MAX+1)
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#define KRT_SHARED_SOCKET
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#define KRT_USE_SYSCTL_7
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#endif
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#ifndef KRT_MAX_TABLES
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#define KRT_MAX_TABLES 1
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#endif
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/* Dynamic max number of tables */
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int krt_max_tables;
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#ifdef KRT_USE_SYSCTL_NET_FIBS
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static int
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krt_get_max_tables(void)
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{
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struct rt_msghdr rtm;
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struct sockaddr_storage buf[RTAX_MAX];
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};
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int fibs;
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size_t fibs_len = sizeof(fibs);
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if (sysctlbyname("net.fibs", &fibs, &fibs_len, NULL, 0) < 0)
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{
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log(L_WARN "KRT: unable to get max number of fib tables: %m");
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return 1;
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}
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return MIN(fibs, KRT_MAX_TABLES);
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}
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#else
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static int
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krt_get_max_tables(void)
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{
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return KRT_MAX_TABLES;
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}
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#endif /* KRT_USE_SYSCTL_NET_FIBS */
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static int rt_sock = 0;
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/* setfib() syscall for FreeBSD scans */
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#ifdef KRT_USE_SETFIB_SCAN
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/*
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static int krt_default_fib;
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static int
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krt_get_active_fib(void)
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{
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int fib;
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size_t fib_len = sizeof(fib);
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if (sysctlbyname("net.my_fibnum", &fib, &fib_len, NULL, 0) < 0)
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{
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log(L_WARN "KRT: unable to get active fib number: %m");
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return 0;
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}
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return fib;
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}
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*/
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extern int setfib(int fib);
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#endif /* KRT_USE_SETFIB_SCAN */
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/* table_id -> krt_proto map */
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#ifdef KRT_SHARED_SOCKET
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static struct krt_proto *krt_table_map[KRT_MAX_TABLES];
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#endif
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/* Route socket message processing */
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int
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krt_capable(rte *e)
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@ -65,6 +160,16 @@ krt_capable(rte *e)
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);
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}
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#ifndef RTAX_MAX
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#define RTAX_MAX 8
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#endif
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struct ks_msg
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{
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struct rt_msghdr rtm;
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struct sockaddr_storage buf[RTAX_MAX];
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};
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#define ROUNDUP(a) \
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((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
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@ -81,7 +186,7 @@ krt_capable(rte *e)
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body += l;}
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static int
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krt_sock_send(int cmd, rte *e)
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krt_send_route(struct krt_proto *p, int cmd, rte *e)
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{
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net *net = e->net;
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rta *a = e->attrs;
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@ -103,13 +208,13 @@ krt_sock_send(int cmd, rte *e)
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msg.rtm.rtm_flags = RTF_UP | RTF_PROTO1;
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if (net->n.pxlen == MAX_PREFIX_LENGTH)
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{
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msg.rtm.rtm_flags |= RTF_HOST;
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}
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else
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{
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msg.rtm.rtm_addrs |= RTA_NETMASK;
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}
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#ifdef KRT_SHARED_SOCKET
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msg.rtm.rtm_tableid = KRT_CF->sys.table_id;
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#endif
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#ifdef RTF_REJECT
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if(a->dest == RTD_UNREACHABLE)
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@ -192,7 +297,7 @@ krt_sock_send(int cmd, rte *e)
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l = body - (char *)&msg;
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msg.rtm.rtm_msglen = l;
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if ((l = write(rt_sock, (char *)&msg, l)) < 0) {
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if ((l = write(p->sys.sk->fd, (char *)&msg, l)) < 0) {
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log(L_ERR "KRT: Error sending route %I/%d to kernel: %m", net->n.prefix, net->n.pxlen);
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return -1;
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}
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@ -201,16 +306,16 @@ krt_sock_send(int cmd, rte *e)
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}
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void
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krt_replace_rte(struct krt_proto *p UNUSED, net *n, rte *new, rte *old,
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krt_replace_rte(struct krt_proto *p, net *n, rte *new, rte *old,
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struct ea_list *eattrs UNUSED)
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{
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int err = 0;
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if (old)
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krt_sock_send(RTM_DELETE, old);
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krt_send_route(p, RTM_DELETE, old);
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if (new)
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err = krt_sock_send(RTM_ADD, new);
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err = krt_send_route(p, RTM_ADD, new);
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if (err < 0)
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n->n.flags |= KRF_SYNC_ERROR;
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@ -221,8 +326,10 @@ krt_replace_rte(struct krt_proto *p UNUSED, net *n, rte *new, rte *old,
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#define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0)
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static void
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krt_read_rt(struct ks_msg *msg, struct krt_proto *p, int scan)
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krt_read_route(struct ks_msg *msg, struct krt_proto *p, int scan)
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{
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/* p is NULL iff KRT_SHARED_SOCKET and !scan */
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rte *e;
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net *net;
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sockaddr dst, gate, mask;
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if (flags & RTF_LLINFO)
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SKIP("link-local\n");
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#ifdef KRT_SHARED_SOCKET
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if (!scan)
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{
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int table_id = msg->rtm.rtm_tableid;
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p = (table_id < KRT_MAX_TABLES) ? krt_table_map[table_id] : NULL;
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if (!p)
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SKIP("unknown table id %d\n", table_id);
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}
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#endif
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GETADDR(&dst, RTA_DST);
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GETADDR(&gate, RTA_GATEWAY);
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GETADDR(&mask, RTA_NETMASK);
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@ -594,17 +712,18 @@ krt_read_addr(struct ks_msg *msg)
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ifa_delete(&ifa);
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}
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void
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static void
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krt_read_msg(struct proto *p, struct ks_msg *msg, int scan)
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{
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/* p is NULL iff KRT_SHARED_SOCKET and !scan */
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switch (msg->rtm.rtm_type)
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{
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case RTM_GET:
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if(!scan) return;
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case RTM_ADD:
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case RTM_DELETE:
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krt_read_rt(msg, (struct krt_proto *)p, scan);
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krt_read_route(msg, (struct krt_proto *)p, scan);
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break;
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case RTM_IFANNOUNCE:
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krt_read_ifannounce(msg);
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@ -621,14 +740,57 @@ krt_read_msg(struct proto *p, struct ks_msg *msg, int scan)
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}
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}
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static void
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krt_sysctl_scan(struct proto *p, pool *pool, byte **buf, size_t *bl, int cmd)
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/* Sysctl based scans */
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static byte *krt_buffer;
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static size_t krt_buflen, krt_bufmin;
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static struct proto *krt_buffer_owner;
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static byte *
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krt_buffer_update(struct proto *p, size_t *needed)
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{
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byte *next;
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int mib[6];
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size_t obl, needed;
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size_t req = *needed;
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if ((req > krt_buflen) ||
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((p == krt_buffer_owner) && (req < krt_bufmin)))
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{
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/* min buflen is 32 kB, step is 8 kB, or 128 kB if > 1 MB */
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size_t step = (req < 0x100000) ? 0x2000 : 0x20000;
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krt_buflen = (req < 0x6000) ? 0x8000 : (req + step);
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krt_bufmin = (req < 0x8000) ? 0 : (req - 2*step);
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if (krt_buffer)
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mb_free(krt_buffer);
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krt_buffer = mb_alloc(krt_pool, krt_buflen);
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krt_buffer_owner = p;
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}
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*needed = krt_buflen;
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return krt_buffer;
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}
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static void
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krt_buffer_release(struct proto *p)
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{
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if (p == krt_buffer_owner)
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{
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mb_free(krt_buffer);
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krt_buffer = NULL;
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krt_buflen = 0;
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krt_buffer_owner = 0;
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}
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}
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static void
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krt_sysctl_scan(struct proto *p, int cmd, int table_id)
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{
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byte *buf, *next;
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int mib[7], mcnt;
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size_t needed;
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struct ks_msg *m;
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int retries = 3;
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int rv;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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@ -636,111 +798,249 @@ krt_sysctl_scan(struct proto *p, pool *pool, byte **buf, size_t *bl, int cmd)
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mib[3] = BIRD_PF;
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mib[4] = cmd;
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mib[5] = 0;
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mcnt = 6;
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try:
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if (sysctl(mib, 6 , NULL , &needed, NULL, 0) < 0)
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die("krt_sysctl_scan 1: %m");
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obl = *bl;
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while (needed > *bl) *bl *= 2;
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while (needed < (*bl/2)) *bl /= 2;
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if ((obl!=*bl) || !*buf)
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#ifdef KRT_USE_SYSCTL_7
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if (table_id >= 0)
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{
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if (*buf) mb_free(*buf);
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if ((*buf = mb_alloc(pool, *bl)) == NULL) die("RT scan buf alloc");
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mib[6] = table_id;
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mcnt = 7;
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}
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#endif
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if (sysctl(mib, 6 , *buf, &needed, NULL, 0) < 0)
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#ifdef KRT_USE_SETFIB_SCAN
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if (table_id > 0)
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if (setfib(table_id) < 0)
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{
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if (errno == ENOMEM)
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{
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/* The buffer size changed since last sysctl ('needed' is not changed) */
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if (retries--)
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goto try;
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log(L_ERR "KRT: Route scan failed");
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log(L_ERR "KRT: setfib(%d) failed: %m", table_id);
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return;
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}
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die("krt_sysctl_scan 2: %m");
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#endif
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try:
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rv = sysctl(mib, mcnt, NULL, &needed, NULL, 0);
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if (rv < 0)
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{
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/* OpenBSD returns EINVAL for not yet used tables */
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if ((errno == EINVAL) && (table_id > 0))
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goto exit;
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log(L_ERR "KRT: Route scan estimate failed: %m");
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goto exit;
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}
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for (next = *buf; next < (*buf + needed); next += m->rtm.rtm_msglen)
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/* The table is empty */
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if (needed == 0)
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goto exit;
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buf = krt_buffer_update(p, &needed);
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rv = sysctl(mib, mcnt, buf, &needed, NULL, 0);
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if (rv < 0)
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{
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/* The buffer size changed since last sysctl ('needed' is not changed) */
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if ((errno == ENOMEM) && retries--)
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goto try;
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log(L_ERR "KRT: Route scan failed: %m");
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goto exit;
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}
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#ifdef KRT_USE_SETFIB_SCAN
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if (table_id > 0)
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if (setfib(0) < 0)
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die("KRT: setfib(%d) failed: %m", 0);
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#endif
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/* Process received messages */
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for (next = buf; next < (buf + needed); next += m->rtm.rtm_msglen)
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{
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m = (struct ks_msg *)next;
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krt_read_msg(p, m, 1);
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}
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}
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static byte *krt_buffer = NULL;
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static byte *kif_buffer = NULL;
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static size_t krt_buflen = 32768;
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static size_t kif_buflen = 4096;
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return;
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exit:
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krt_buffer_release(p);
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#ifdef KRT_USE_SETFIB_SCAN
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if (table_id > 0)
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if (setfib(0) < 0)
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die("KRT: setfib(%d) failed: %m", 0);
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#endif
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}
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void
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krt_do_scan(struct krt_proto *p)
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{
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krt_sysctl_scan(&p->p, p->p.pool, &krt_buffer, &krt_buflen, NET_RT_DUMP);
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krt_sysctl_scan(&p->p, NET_RT_DUMP, KRT_CF->sys.table_id);
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}
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void
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kif_do_scan(struct kif_proto *p)
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{
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if_start_update();
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krt_sysctl_scan(&p->p, p->p.pool, &kif_buffer, &kif_buflen, NET_RT_IFLIST);
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krt_sysctl_scan(&p->p, NET_RT_IFLIST, -1);
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if_end_update();
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}
|
||||
|
||||
|
||||
/* Kernel sockets */
|
||||
|
||||
static int
|
||||
krt_sock_hook(sock *sk, int size UNUSED)
|
||||
{
|
||||
struct ks_msg msg;
|
||||
int l = read(sk->fd, (char *)&msg, sizeof(msg));
|
||||
|
||||
if(l <= 0)
|
||||
if (l <= 0)
|
||||
log(L_ERR "krt-sock: read failed");
|
||||
else
|
||||
krt_read_msg((struct proto *)sk->data, &msg, 0);
|
||||
krt_read_msg((struct proto *) sk->data, &msg, 0);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
krt_sys_start(struct krt_proto *x)
|
||||
static sock *
|
||||
krt_sock_open(pool *pool, void *data, int table_id)
|
||||
{
|
||||
sock *sk_rt;
|
||||
static int ks_open_tried = 0;
|
||||
sock *sk;
|
||||
int fd;
|
||||
|
||||
if (ks_open_tried)
|
||||
return;
|
||||
|
||||
ks_open_tried = 1;
|
||||
|
||||
DBG("KRT: Opening kernel socket\n");
|
||||
|
||||
if( (rt_sock = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC)) < 0)
|
||||
fd = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
|
||||
if (fd < 0)
|
||||
die("Cannot open kernel socket for routes");
|
||||
|
||||
sk_rt = sk_new(krt_pool);
|
||||
sk_rt->type = SK_MAGIC;
|
||||
sk_rt->rx_hook = krt_sock_hook;
|
||||
sk_rt->fd = rt_sock;
|
||||
sk_rt->data = x;
|
||||
if (sk_open(sk_rt))
|
||||
#ifdef KRT_USE_SETFIB_SOCK
|
||||
if (table_id > 0)
|
||||
{
|
||||
if (setsockopt(fd, SOL_SOCKET, SO_SETFIB, &table_id, sizeof(table_id)) < 0)
|
||||
die("Cannot set FIB %d for kernel socket: %m", table_id);
|
||||
}
|
||||
#endif
|
||||
|
||||
sk = sk_new(pool);
|
||||
sk->type = SK_MAGIC;
|
||||
sk->rx_hook = krt_sock_hook;
|
||||
sk->fd = fd;
|
||||
sk->data = data;
|
||||
|
||||
if (sk_open(sk) < 0)
|
||||
bug("krt-sock: sk_open failed");
|
||||
|
||||
return sk;
|
||||
}
|
||||
|
||||
|
||||
#ifdef KRT_SHARED_SOCKET
|
||||
|
||||
static sock *krt_sock;
|
||||
static int krt_sock_count;
|
||||
|
||||
|
||||
static void
|
||||
krt_sock_open_shared(void)
|
||||
{
|
||||
if (!krt_sock_count)
|
||||
krt_sock = krt_sock_open(krt_pool, NULL, -1);
|
||||
|
||||
krt_sock_count++;
|
||||
}
|
||||
|
||||
static void
|
||||
krt_sock_close_shared(void)
|
||||
{
|
||||
krt_sock_count--;
|
||||
|
||||
if (!krt_sock_count)
|
||||
{
|
||||
rfree(krt_sock);
|
||||
krt_sock = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
krt_sys_shutdown(struct krt_proto *x UNUSED)
|
||||
krt_sys_start(struct krt_proto *p)
|
||||
{
|
||||
if (!krt_buffer)
|
||||
return;
|
||||
krt_table_map[KRT_CF->sys.table_id] = p;
|
||||
|
||||
mb_free(krt_buffer);
|
||||
krt_buffer = NULL;
|
||||
krt_sock_open_shared();
|
||||
p->sys.sk = krt_sock;
|
||||
}
|
||||
|
||||
void
|
||||
krt_sys_shutdown(struct krt_proto *p)
|
||||
{
|
||||
krt_sock_close_shared();
|
||||
p->sys.sk = NULL;
|
||||
|
||||
krt_table_map[KRT_CF->sys.table_id] = NULL;
|
||||
|
||||
krt_buffer_release(&p->p);
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
void
|
||||
krt_sys_start(struct krt_proto *p)
|
||||
{
|
||||
p->sys.sk = krt_sock_open(p->p.pool, p, KRT_CF->sys.table_id);
|
||||
}
|
||||
|
||||
void
|
||||
krt_sys_shutdown(struct krt_proto *p)
|
||||
{
|
||||
rfree(p->sys.sk);
|
||||
p->sys.sk = NULL;
|
||||
|
||||
krt_buffer_release(&p->p);
|
||||
}
|
||||
|
||||
#endif /* KRT_SHARED_SOCKET */
|
||||
|
||||
|
||||
/* KRT configuration callbacks */
|
||||
|
||||
static u32 krt_table_cf[(KRT_MAX_TABLES+31) / 32];
|
||||
|
||||
int
|
||||
krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o)
|
||||
{
|
||||
return n->sys.table_id == o->sys.table_id;
|
||||
}
|
||||
|
||||
void
|
||||
krt_sys_preconfig(struct config *c UNUSED)
|
||||
{
|
||||
krt_max_tables = krt_get_max_tables();
|
||||
bzero(&krt_table_cf, sizeof(krt_table_cf));
|
||||
}
|
||||
|
||||
void
|
||||
krt_sys_postconfig(struct krt_config *x)
|
||||
{
|
||||
u32 *tbl = krt_table_cf;
|
||||
int id = x->sys.table_id;
|
||||
|
||||
if (tbl[id/32] & (1 << (id%32)))
|
||||
cf_error("Multiple kernel syncers defined for table #%d", id);
|
||||
|
||||
tbl[id/32] |= (1 << (id%32));
|
||||
}
|
||||
|
||||
void krt_sys_init_config(struct krt_config *c)
|
||||
{
|
||||
c->sys.table_id = 0; /* Default table */
|
||||
}
|
||||
|
||||
void krt_sys_copy_config(struct krt_config *d, struct krt_config *s)
|
||||
{
|
||||
d->sys.table_id = s->sys.table_id;
|
||||
}
|
||||
|
||||
|
||||
/* KIF misc code */
|
||||
|
||||
void
|
||||
kif_sys_start(struct kif_proto *p UNUSED)
|
||||
|
|
@ -748,12 +1048,8 @@ kif_sys_start(struct kif_proto *p UNUSED)
|
|||
}
|
||||
|
||||
void
|
||||
kif_sys_shutdown(struct kif_proto *p UNUSED)
|
||||
kif_sys_shutdown(struct kif_proto *p)
|
||||
{
|
||||
if (!kif_buffer)
|
||||
return;
|
||||
|
||||
mb_free(kif_buffer);
|
||||
kif_buffer = NULL;
|
||||
krt_buffer_release(&p->p);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -9,6 +9,7 @@
|
|||
#ifndef _BIRD_KRT_SYS_H_
|
||||
#define _BIRD_KRT_SYS_H_
|
||||
|
||||
struct birdsock;
|
||||
|
||||
/* Kernel interfaces */
|
||||
|
||||
|
|
@ -30,20 +31,18 @@ static inline void kif_sys_copy_config(struct kif_config *d UNUSED, struct kif_c
|
|||
|
||||
/* Kernel routes */
|
||||
|
||||
extern int krt_max_tables;
|
||||
|
||||
struct krt_params {
|
||||
int table_id; /* Kernel table ID we sync with */
|
||||
};
|
||||
|
||||
struct krt_state {
|
||||
struct birdsock *sk;
|
||||
};
|
||||
|
||||
|
||||
static inline void krt_sys_init(struct krt_proto *p UNUSED) { }
|
||||
static inline int krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n UNUSED, struct krt_config *o UNUSED) { return 1; }
|
||||
|
||||
static inline void krt_sys_preconfig(struct config *c UNUSED) { }
|
||||
static inline void krt_sys_postconfig(struct krt_config *c UNUSED) { }
|
||||
static inline void krt_sys_init_config(struct krt_config *c UNUSED) { }
|
||||
static inline void krt_sys_copy_config(struct krt_config *d UNUSED, struct krt_config *s UNUSED) { }
|
||||
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -10,6 +10,7 @@
|
|||
|
||||
#define CONFIG_AUTO_ROUTES
|
||||
#define CONFIG_SELF_CONSCIOUS
|
||||
#define CONFIG_MULTIPLE_TABLES
|
||||
|
||||
#define CONFIG_SKIP_MC_BIND
|
||||
|
||||
|
|
|
|||
|
|
@ -8,6 +8,7 @@
|
|||
|
||||
#define CONFIG_AUTO_ROUTES
|
||||
#define CONFIG_SELF_CONSCIOUS
|
||||
#define CONFIG_MULTIPLE_TABLES
|
||||
|
||||
#define CONFIG_SKIP_MC_BIND
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue