Kernel route syncer supports multiple tables.

The changes are just too extensive for lazy me to list them
there, but see the comment at the top of sysdep/unix/krt.c.
The code got a bit more ifdeffy than I'd like, though.

Also fixed a bunch of FIXME's and added a couple of others. :)
This commit is contained in:
Martin Mares 1999-08-03 19:33:22 +00:00
parent 9d8856897f
commit 7de45ba4a0
17 changed files with 260 additions and 77 deletions

6
TODO
View file

@ -6,8 +6,6 @@ Core
- config: executable config files
- do we really need preconfig?
- counters (according to SNMP MIB?)
- better memory allocators
- default preferences of protocols: prefer BGP over OSPF/RIP external routes?
@ -26,6 +24,10 @@ Core
- OSPF: refuse running on non-multicast devices
- config: when parsing prefix, check zero bits
- krt: rescan interfaces when route addition fails?
Cleanup
~~~~~~~
- right usage of DBG vs. debug

View file

@ -32,6 +32,7 @@ protocol kernel {
# async off; # Netlink: Disable asynchronous events
# import none; # Default is import all
export all; # Default is export none
# kernel table 5; # Kernel table to synchronize with (default: main)
}
protocol device {

View file

@ -109,6 +109,7 @@ struct rtable_config {
node n;
char *name;
struct rtable *table;
struct proto_config *krt_attached; /* Kernel syncer attached to this table */
};
typedef struct rtable {

View file

@ -104,6 +104,7 @@ do_rte_announce(struct announce_hook *a, net *net, rte *new, rte *old, ea_list *
struct proto *p = a->proto;
rte *new0 = new;
rte *old0 = old;
if (new)
{
int ok = p->import_control ? p->import_control(p, &new, &tmpa, rte_update_pool) : 0;

View file

@ -4,6 +4,8 @@ Available configuration variables:
CONFIG_AUTO_ROUTES Device routes are added automagically by the kernel
CONFIG_ALL_MULTICAST All devices support multicasting (i.e., ignore IFF_MULTICAST)
CONFIG_SELF_CONSCIOUS We're able to recognize whether route was installed by us
CONFIG_MULTIPLE_TABLES The kernel supports multiple routing tables
CONFIG_ALL_TABLES_AT_ONCE Kernel scanner wants to process all tables at once
CONFIG_UNIX_IFACE Use Unix interface scanner
CONFIG_UNIX_SET Use Unix route setting

View file

@ -9,7 +9,8 @@
#define CONFIG_AUTO_ROUTES
#define CONFIG_ALL_MULTICAST
#define CONFIG_SELF_CONSCIOUS
#define CONFIG_MULTIPLE_TABLES 256
#define CONFIG_MULTIPLE_TABLES
#define CONFIG_ALL_TABLES_AT_ONCE
/*
Link: sysdep/linux/netlink

View file

@ -174,17 +174,27 @@ krt_scan_fire(struct krt_proto *p)
}
void
krt_scan_preconfig(struct krt_config *c)
krt_scan_construct(struct krt_config *c)
{
}
void
krt_scan_start(struct krt_proto *x)
krt_scan_preconfig(struct config *c)
{
}
void
krt_scan_postconfig(struct krt_config *c)
{
}
void
krt_scan_start(struct krt_proto *x, int first)
{
init_list(&x->scan.temp_ifs);
}
void
krt_scan_shutdown(struct krt_proto *x)
krt_scan_shutdown(struct krt_proto *x, int last)
{
}

View file

@ -19,7 +19,7 @@ struct krt_if_params {
struct krt_if_status {
};
static inline void krt_if_preconfig(struct kif_config *c) { };
static inline void krt_if_construct(struct kif_config *c) { };
static inline void krt_if_shutdown(struct kif_proto *p) { };
static inline void krt_if_io_init(void) { };

View file

@ -17,6 +17,7 @@
struct krt_scan_params {
int async; /* Allow asynchronous events */
int table_id; /* Kernel table ID we sync with */
};
struct krt_scan_status {

View file

@ -19,8 +19,8 @@ struct krt_set_params {
struct krt_set_status {
};
static inline void krt_set_preconfig(struct krt_config *c) { };
static inline void krt_set_start(struct krt_proto *p) { };
static inline void krt_set_shutdown(struct krt_proto *p) { };
static inline void krt_set_construct(struct krt_config *c) { };
static inline void krt_set_start(struct krt_proto *p, int first) { };
static inline void krt_set_shutdown(struct krt_proto *p, int last) { };
#endif

View file

@ -10,7 +10,7 @@ CF_HDR
CF_DECLS
CF_KEYWORDS(ASYNC)
CF_KEYWORDS(ASYNC, KERNEL, TABLE)
CF_GRAMMAR
@ -18,6 +18,11 @@ CF_ADDTO(kern_proto, kern_proto nl_item ';')
nl_item:
ASYNC bool { THIS_KRT->scan.async = $2; }
| KERNEL TABLE expr {
if ($3 <= 0 || $3 >= 255)
cf_error("Kernel routing table number out of range");
THIS_KRT->scan.table_id = $3;
}
;
CF_CODE

View file

@ -24,6 +24,7 @@
#include "lib/unix.h"
#include "lib/krt.h"
#include "lib/socket.h"
#include "conf/conf.h"
#include <asm/types.h>
#include <linux/netlink.h>
@ -403,6 +404,8 @@ krt_if_scan(struct kif_proto *p)
* Routes
*/
static struct krt_proto *nl_table_map[256];
int
krt_capable(rte *e)
{
@ -431,7 +434,7 @@ krt_capable(rte *e)
}
static void
nl_send_route(rte *e, int new)
nl_send_route(struct krt_proto *p, rte *e, int new)
{
net *net = e->net;
rta *a = e->attrs;
@ -453,10 +456,10 @@ nl_send_route(rte *e, int new)
r.r.rtm_family = AF_INET;
r.r.rtm_dst_len = net->n.pxlen;
r.r.rtm_tos = 0; /* FIXME: Non-zero TOS? */
r.r.rtm_table = RT_TABLE_MAIN; /* FIXME: Other tables? */
r.r.rtm_tos = 0;
r.r.rtm_table = KRT_CF->scan.table_id;
r.r.rtm_protocol = RTPROT_BIRD;
r.r.rtm_scope = RT_SCOPE_UNIVERSE; /* FIXME: Other scopes? */
r.r.rtm_scope = RT_SCOPE_UNIVERSE;
nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net->n.prefix);
switch (a->dest)
{
@ -489,19 +492,22 @@ krt_set_notify(struct krt_proto *p, net *n, rte *new, rte *old)
{
if (old && new)
{
/* FIXME: Priorities and TOS should be identical as well, but we don't use them yet. */
nl_send_route(new, 1);
/*
* We should check whether priority and TOS is identical as well,
* but we don't use these and default value is always equal to default value. :-)
*/
nl_send_route(p, new, 1);
}
else
{
if (old)
{
if (!old->attrs->iface || (old->attrs->iface->flags & IF_UP))
nl_send_route(old, 0);
nl_send_route(p, old, 0);
/* else the kernel has already flushed it */
}
if (new)
nl_send_route(new, 1);
nl_send_route(p, new, 1);
}
}
@ -524,8 +530,9 @@ krt_temp_iface(struct krt_proto *p, unsigned index)
}
static void
nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
nl_parse_route(struct nlmsghdr *h, int scan)
{
struct krt_proto *p;
struct rtmsg *i;
struct rtattr *a[RTA_CACHEINFO+1];
int new = h->nlmsg_type == RTM_NEWROUTE;
@ -549,10 +556,15 @@ nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
return;
}
if (i->rtm_table != RT_TABLE_MAIN) /* FIXME: What about other tables? */
p = nl_table_map[i->rtm_table]; /* Do we know this table? */
if (!p)
return;
if (i->rtm_tos != 0) /* FIXME: What about TOS? */
if (i->rtm_tos != 0) /* We don't support TOS */
{
DBG("KRT: Ignoring route with TOS %02x\n", i->rtm_tos);
return;
}
if (scan && !new)
{
@ -572,7 +584,7 @@ nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
else
oif = ~0;
DBG("Got %I/%d, type=%d, oif=%d\n", dst, i->rtm_dst_len, i->rtm_type, oif);
DBG("Got %I/%d, type=%d, oif=%d, table=%d, proto=%s\n", dst, i->rtm_dst_len, i->rtm_type, oif, i->rtm_table, p->p.name);
switch (i->rtm_protocol)
{
@ -647,7 +659,7 @@ nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
return;
}
if (i->rtm_scope != RT_SCOPE_UNIVERSE) /* FIXME: Other scopes? */
if (i->rtm_scope != RT_SCOPE_UNIVERSE)
{
DBG("KRT: Ignoring route with scope=%d\n", i->rtm_scope);
return;
@ -669,14 +681,14 @@ nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
}
void
krt_scan_fire(struct krt_proto *p)
krt_scan_fire(struct krt_proto *p) /* CONFIG_ALL_TABLES_AT_ONCE => p is NULL */
{
struct nlmsghdr *h;
nl_request_dump(RTM_GETROUTE);
while (h = nl_get_scan())
if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
nl_parse_route(p, h, 1);
nl_parse_route(h, 1);
else
log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
}
@ -689,14 +701,14 @@ static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */
static byte *nl_async_rx_buffer; /* Receive buffer */
static void
nl_async_msg(struct krt_proto *p, struct nlmsghdr *h)
nl_async_msg(struct nlmsghdr *h)
{
switch (h->nlmsg_type)
{
case RTM_NEWROUTE:
case RTM_DELROUTE:
DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type);
nl_parse_route(p, h, 0);
nl_parse_route(h, 0);
break;
case RTM_NEWLINK:
case RTM_DELLINK:
@ -716,7 +728,6 @@ nl_async_msg(struct krt_proto *p, struct nlmsghdr *h)
static int
nl_async_hook(sock *sk, int size)
{
struct krt_proto *p = sk->data;
struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE };
struct sockaddr_nl sa;
struct msghdr m = { (struct sockaddr *) &sa, sizeof(sa), &iov, 1, NULL, 0, 0 };
@ -746,7 +757,7 @@ nl_async_hook(sock *sk, int size)
}
while (NLMSG_OK(h, len))
{
nl_async_msg(p, h);
nl_async_msg(h);
h = NLMSG_NEXT(h, len);
}
if (len)
@ -755,7 +766,7 @@ nl_async_hook(sock *sk, int size)
}
static void
nl_open_async(struct krt_proto *p)
nl_open_async(void)
{
sock *sk;
struct sockaddr_nl sa;
@ -766,7 +777,7 @@ nl_open_async(struct krt_proto *p)
fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (fd < 0)
{
log(L_ERR "Unable to open secondary rtnetlink socket: %m");
log(L_ERR "Unable to open asynchronous rtnetlink socket: %m");
return;
}
@ -775,13 +786,12 @@ nl_open_async(struct krt_proto *p)
sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE;
if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0)
{
log(L_ERR "Unable to bind secondary rtnetlink socket: %m");
log(L_ERR "Unable to bind asynchronous rtnetlink socket: %m");
return;
}
sk = nl_async_sk = sk_new(p->p.pool);
sk = nl_async_sk = sk_new(krt_pool);
sk->type = SK_MAGIC;
sk->data = p;
sk->rx_hook = nl_async_hook;
sk->fd = fd;
if (sk_open(sk))
@ -795,24 +805,47 @@ nl_open_async(struct krt_proto *p)
* Interface to the UNIX krt module
*/
static u8 nl_cf_table[256 / 8];
void
krt_scan_preconfig(struct krt_config *x)
krt_scan_preconfig(struct config *c)
{
bzero(&nl_cf_table, sizeof(nl_cf_table));
}
void
krt_scan_postconfig(struct krt_config *x)
{
int id = x->scan.table_id;
if (nl_cf_table[id/8] & (1 << (id%8)))
cf_error("Multiple kernel syncers defined for table #%d", id);
nl_cf_table[id/8] |= (1 << (id%8));
}
void
krt_scan_construct(struct krt_config *x)
{
x->scan.async = 1;
x->scan.table_id = RT_TABLE_MAIN;
/* FIXME: Use larger defaults for scanning times? */
}
void
krt_scan_start(struct krt_proto *p)
krt_scan_start(struct krt_proto *p, int first)
{
init_list(&p->scan.temp_ifs);
nl_table_map[KRT_CF->scan.table_id] = p;
if (first)
{
nl_open();
if (KRT_CF->scan.async) /* FIXME: Async is for debugging only. Get rid of it some day. */
nl_open_async(p);
nl_open_async();
}
}
void
krt_scan_shutdown(struct krt_proto *p)
krt_scan_shutdown(struct krt_proto *p, int last)
{
}

View file

@ -205,7 +205,7 @@ krt_if_scan(struct kif_proto *p)
}
void
krt_if_preconfig(struct kif_config *c)
krt_if_construct(struct kif_config *c)
{
}

View file

@ -92,18 +92,18 @@ krt_set_notify(struct krt_proto *p, net *net, rte *new, rte *old)
}
void
krt_set_start(struct krt_proto *x)
krt_set_start(struct krt_proto *x, int first)
{
if (if_scan_sock < 0)
bug("krt set: missing socket");
}
void
krt_set_preconfig(struct krt_config *c)
krt_set_construct(struct krt_config *c)
{
}
void
krt_set_shutdown(struct krt_proto *x)
krt_set_shutdown(struct krt_proto *x, int last)
{
}

View file

@ -24,14 +24,16 @@ CF_GRAMMAR
CF_ADDTO(proto, kern_proto '}')
kern_proto_start: proto_start KERNEL {
#ifndef CONFIG_MULTIPLE_TABLES
if (cf_krt)
cf_error("Kernel protocol already defined");
#endif
cf_krt = this_proto = proto_config_new(&proto_unix_kernel, sizeof(struct krt_config));
this_proto->preference = 0;
THIS_KRT->scan_time = 60;
THIS_KRT->learn = THIS_KRT->persist = 0;
krt_scan_preconfig(THIS_KRT);
krt_set_preconfig(THIS_KRT);
krt_scan_construct(THIS_KRT);
krt_set_construct(THIS_KRT);
}
;
@ -64,7 +66,7 @@ kif_proto_start: proto_start DEVICE {
cf_kif = this_proto = proto_config_new(&proto_unix_iface, sizeof(struct kif_config));
this_proto->preference = DEF_PREF_DIRECT;
THIS_KIF->scan_time = 60;
krt_if_preconfig(THIS_KIF);
krt_if_construct(THIS_KIF);
}
;

View file

@ -13,19 +13,47 @@
#include "nest/route.h"
#include "nest/protocol.h"
#include "lib/timer.h"
#include "conf/conf.h"
#include "unix.h"
#include "krt.h"
/*
* The whole kernel synchronization is a bit messy and touches some internals
* of the routing table engine, because routing table maintenance is a typical
* example of the proverbial compatibility between different Unices and we want
* to keep the overhead of our krt business as low as possible and avoid maintaining
* a local routing table copy.
*
* The kernel syncer can work in three different modes (according to system config header):
* o Single routing table, single krt protocol. [traditional Unix]
* o Many routing tables, separate krt protocols for all of them.
* o Many routing tables, but every scan includes all tables, so we start
* separate krt protocols which cooperate with each other. [Linux 2.2]
* In this case, we keep only a single scan timer.
*
* The hacky bits:
* o We use FIB node flags to keep track of route synchronization status.
* o When starting up, we cheat by looking if there is another kernel
* krt instance to be initialized later and performing table scan
* only once for all the instances.
* o We attach temporary rte's to routing tables.
*
* If you are brave enough, continue now. You cannot say you haven't been warned.
*/
static int krt_uptodate(rte *k, rte *e);
/*
* Global resources
*/
pool *krt_pool;
void
krt_io_init(void)
{
krt_pool = rp_new(&root_pool, "Kernel Syncer");
krt_if_io_init();
}
@ -96,6 +124,12 @@ kif_shutdown(struct proto *P)
if_start_update(); /* Remove all interfaces */
if_end_update();
/*
* FIXME: Is it really a good idea? It causes routes to be flushed,
* but at the same time it avoids sending of these deletions to the kernel,
* because krt thinks the kernel itself has already removed the route
* when downing the interface. Sad.
*/
return PS_DOWN;
}
@ -182,8 +216,6 @@ krt_learn_scan(struct krt_proto *p, rte *e)
}
}
/* FIXME: Add dump function */
static void
krt_learn_prune(struct krt_proto *p)
{
@ -353,6 +385,12 @@ krt_dump_attrs(rte *e)
* Routes
*/
#ifdef CONFIG_ALL_TABLES_AT_ONCE
static timer *krt_scan_timer;
static int krt_instance_count;
static list krt_instance_list;
#endif
static void
krt_flush_routes(struct krt_proto *p)
{
@ -373,8 +411,6 @@ krt_flush_routes(struct krt_proto *p)
FIB_WALK_END;
}
/* FIXME: Synchronization of multiple routing tables? */
static int
krt_uptodate(rte *k, rte *e)
{
@ -469,7 +505,7 @@ krt_prune(struct krt_proto *p)
struct rtable *t = p->p.table;
struct fib_node *f;
DBG("Pruning routes...\n");
DBG("Pruning routes in table %s...\n", t->name);
FIB_WALK(&t->fib, f)
{
net *n = (net *) f;
@ -556,17 +592,29 @@ krt_got_route_async(struct krt_proto *p, rte *e, int new)
* Periodic scanning
*/
static timer *krt_scan_timer;
static void
krt_scan(timer *t)
{
struct krt_proto *p = t->data;
struct krt_proto *p;
kif_force_scan();
#ifdef CONFIG_ALL_TABLES_AT_ONCE
{
void *q;
DBG("KRT: It's route scan time...\n");
krt_scan_fire(NULL);
WALK_LIST(q, krt_instance_list)
{
p = SKIP_BACK(struct krt_proto, instance_node, q);
krt_prune(p);
}
}
#else
p = t->data;
DBG("KRT: It's route scan time for %s...\n", p->p.name);
krt_scan_fire(p);
krt_prune(p);
#endif
}
/*
@ -595,41 +643,106 @@ krt_notify(struct proto *P, net *net, rte *new, rte *old, struct ea_list *tmpa)
struct proto_config *cf_krt;
static void
krt_preconfig(struct protocol *P, struct config *c)
{
krt_scan_preconfig(c);
}
static void
krt_postconfig(struct proto_config *C)
{
struct krt_config *c = (struct krt_config *) C;
#ifdef CONFIG_ALL_TABLES_AT_ONCE
struct krt_config *first = (struct krt_config *) cf_krt;
if (first->scan_time != c->scan_time)
cf_error("All kernel syncers must use the same table scan interval");
#endif
if (C->table->krt_attached)
cf_error("Kernel syncer (%s) already attached to table %s", C->table->krt_attached->name, C->table->name);
C->table->krt_attached = C;
krt_scan_postconfig(c);
}
static timer *
krt_start_timer(struct krt_proto *p)
{
timer *t;
t = tm_new(p->krt_pool);
t->hook = krt_scan;
t->data = p;
t->recurrent = KRT_CF->scan_time;
tm_start(t, KRT_CF->scan_time);
return t;
}
static int
krt_start(struct proto *P)
{
struct krt_proto *p = (struct krt_proto *) P;
int first = 1;
#ifdef CONFIG_ALL_TABLES_AT_ONCE
if (!krt_instance_count++)
init_list(&krt_instance_list);
else
first = 0;
p->krt_pool = krt_pool;
add_tail(&krt_instance_list, &p->instance_node);
#else
p->krt_pool = P->pool;
#endif
#ifdef KRT_ALLOW_LEARN
krt_learn_init(p);
#endif
krt_scan_start(p);
krt_set_start(p);
krt_scan_start(p, first);
krt_set_start(p, first);
/* Start periodic routing table scanning */
krt_scan_timer = tm_new(P->pool);
krt_scan_timer->hook = krt_scan;
krt_scan_timer->data = p;
krt_scan_timer->recurrent = KRT_CF->scan_time;
krt_scan(krt_scan_timer);
tm_start(krt_scan_timer, KRT_CF->scan_time);
#ifdef CONFIG_ALL_TABLES_AT_ONCE
if (first)
krt_scan_timer = krt_start_timer(p);
p->scan_timer = krt_scan_timer;
/* If this is the last instance to be initialized, kick the timer */
if (!P->proto->startup_counter)
krt_scan(p->scan_timer);
#else
p->scan_timer = krt_start_timer(p);
krt_scan(p->scan_timer);
#endif
return PS_UP;
}
int
static int
krt_shutdown(struct proto *P)
{
struct krt_proto *p = (struct krt_proto *) P;
int last = 1;
tm_stop(krt_scan_timer);
#ifdef CONFIG_ALL_TABLES_AT_ONCE
rem_node(&p->instance_node);
if (--krt_instance_count)
last = 0;
else
#endif
tm_stop(p->scan_timer);
if (!KRT_CF->persist)
krt_flush_routes(p);
krt_set_shutdown(p);
krt_scan_shutdown(p);
krt_set_shutdown(p, last);
krt_scan_shutdown(p, last);
#ifdef CONFIG_ALL_TABLES_AT_ONCE
if (last)
rfree(krt_scan_timer);
#endif
return PS_DOWN;
}
@ -646,6 +759,8 @@ krt_init(struct proto_config *c)
struct protocol proto_unix_kernel = {
name: "Kernel",
priority: 80,
preconfig: krt_preconfig,
postconfig: krt_postconfig,
init: krt_init,
start: krt_start,
shutdown: krt_shutdown,

View file

@ -9,6 +9,7 @@
#ifndef _BIRD_KRT_H_
#define _BIRD_KRT_H_
struct config;
struct krt_config;
struct krt_proto;
struct kif_config;
@ -55,10 +56,16 @@ struct krt_proto {
struct krt_if_status iface;
#ifdef KRT_ALLOW_LEARN
struct rtable krt_table; /* Internal table of inherited routes */
#endif
pool *krt_pool; /* Pool used for common krt data */
timer *scan_timer;
#ifdef CONFIG_ALL_TABLES_AT_ONCE
node instance_node; /* Node in krt instance list */
#endif
};
extern struct proto_config *cf_krt;
extern pool *krt_pool;
#define KRT_CF ((struct krt_config *)p->p.cf)
@ -90,24 +97,26 @@ extern struct proto_config *cf_kif;
/* krt-scan.c */
void krt_scan_preconfig(struct krt_config *);
void krt_scan_start(struct krt_proto *);
void krt_scan_shutdown(struct krt_proto *);
void krt_scan_preconfig(struct config *);
void krt_scan_postconfig(struct krt_config *);
void krt_scan_construct(struct krt_config *);
void krt_scan_start(struct krt_proto *, int);
void krt_scan_shutdown(struct krt_proto *, int);
void krt_scan_fire(struct krt_proto *);
/* krt-set.c */
void krt_set_preconfig(struct krt_config *);
void krt_set_start(struct krt_proto *);
void krt_set_shutdown(struct krt_proto *);
void krt_set_construct(struct krt_config *);
void krt_set_start(struct krt_proto *, int);
void krt_set_shutdown(struct krt_proto *, int);
int krt_capable(rte *e);
void krt_set_notify(struct krt_proto *x, net *net, rte *new, rte *old);
/* krt-iface.c */
void krt_if_preconfig(struct kif_config *);
void krt_if_construct(struct kif_config *);
void krt_if_start(struct kif_proto *);
void krt_if_shutdown(struct kif_proto *);