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Better support for multitable protocols.

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The nest-protocol interaction is changed to better handle multitable
protocols. Multitable protocols now declare that by 'multitable' field,
which tells nest that a protocol handles things related to proto-rtable
interaction (table locking, announce hook adding, reconfiguration of
filters) itself.

Filters and stats are moved to announce hooks, a protocol could have
different filters and stats to different tables.

The patch is based on one from Alexander V. Chernikov, thanks.
This commit is contained in:
Ondrej Zajicek
2012-03-15 11:58:08 +01:00
parent 46c1a583a5
commit c0adf7e9fc
8 changed files with 329 additions and 204 deletions
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189
proto/pipe/pipe.c
View File

@ -16,6 +16,17 @@
*
* To avoid pipe loops, Pipe keeps a `being updated' flag in each routing
* table.
*
* A pipe has two announce hooks, the first connected to the main
* table, the second connected to the peer table. When a new route is
* announced on the main table, it gets checked by an export filter in
* ahook 1, and, after that, it is announced to the peer table via
* rte_update(), an import filter in ahook 2 is called. When a new
* route is announced in the peer table, an export filter in ahook2
* and an import filter in ahook 1 are used. Oviously, there is no
* need in filtering the same route twice, so both import filters
* are set to accept, while user configured 'import' and 'export'
* filters are used as export filters in ahooks 2 and 1.
*/
#undef LOCAL_DEBUG
@ -24,6 +35,7 @@
#include "nest/iface.h"
#include "nest/protocol.h"
#include "nest/route.h"
#include "nest/cli.h"
#include "conf/conf.h"
#include "filter/filter.h"
#include "lib/string.h"
@ -34,7 +46,8 @@ static void
pipe_rt_notify(struct proto *P, rtable *src_table, net *n, rte *new, rte *old, ea_list *attrs)
{
struct pipe_proto *p = (struct pipe_proto *) P;
rtable *dest = (src_table == P->table) ? p->peer : P->table; /* The other side of the pipe */
struct announce_hook *ah = (src_table == P->table) ? p->peer_ahook : P->main_ahook;
rtable *dst_table = ah->table;
struct proto *src;
net *nn;
@ -44,13 +57,14 @@ pipe_rt_notify(struct proto *P, rtable *src_table, net *n, rte *new, rte *old, e
if (!new && !old)
return;
if (dest->pipe_busy)
if (dst_table->pipe_busy)
{
log(L_ERR "Pipe loop detected when sending %I/%d to table %s",
n->n.prefix, n->n.pxlen, dest->name);
n->n.prefix, n->n.pxlen, dst_table->name);
return;
}
nn = net_get(dest, n->n.prefix, n->n.pxlen);
nn = net_get(dst_table, n->n.prefix, n->n.pxlen);
if (new)
{
memcpy(&a, new->attrs, sizeof(rta));
@ -85,14 +99,14 @@ pipe_rt_notify(struct proto *P, rtable *src_table, net *n, rte *new, rte *old, e
}
src_table->pipe_busy = 1;
rte_update(dest, nn, &p->p, (p->mode == PIPE_OPAQUE) ? &p->p : src, e);
rte_update2(ah, nn, e, (p->mode == PIPE_OPAQUE) ? &p->p : src);
src_table->pipe_busy = 0;
}
static int
pipe_import_control(struct proto *P, rte **ee, ea_list **ea UNUSED, struct linpool *p UNUSED)
{
struct proto *pp = (*ee)->sender;
struct proto *pp = (*ee)->sender->proto;
if (pp == P)
return -1; /* Avoid local loops automatically */
@ -112,20 +126,39 @@ pipe_reload_routes(struct proto *P)
return 1;
}
static struct proto *
pipe_init(struct proto_config *C)
{
struct pipe_config *c = (struct pipe_config *) C;
struct proto *P = proto_new(C, sizeof(struct pipe_proto));
struct pipe_proto *p = (struct pipe_proto *) P;
p->mode = c->mode;
p->peer_table = c->peer->table;
P->accept_ra_types = (p->mode == PIPE_OPAQUE) ? RA_OPTIMAL : RA_ANY;
P->rt_notify = pipe_rt_notify;
P->import_control = pipe_import_control;
P->reload_routes = pipe_reload_routes;
return P;
}
static int
pipe_start(struct proto *P)
{
struct pipe_proto *p = (struct pipe_proto *) P;
struct announce_hook *a;
/* Clean up the secondary stats */
bzero(&p->peer_stats, sizeof(struct proto_stats));
/* Lock both tables, unlock is handled in pipe_cleanup() */
rt_lock_table(P->table);
rt_lock_table(p->peer_table);
/* Lock the peer table, unlock is handled in pipe_cleanup() */
rt_lock_table(p->peer);
/* Going directly to PS_UP - prepare for feeding,
connect the protocol to both routing tables */
/* Connect the protocol also to the peer routing table. */
a = proto_add_announce_hook(P, p->peer);
P->main_ahook = proto_add_announce_hook(P, P->table,
FILTER_ACCEPT, P->cf->out_filter, &P->stats);
p->peer_ahook = proto_add_announce_hook(P, p->peer_table,
FILTER_ACCEPT, P->cf->in_filter, &p->peer_stats);
return PS_UP;
}
@ -134,24 +167,15 @@ static void
pipe_cleanup(struct proto *P)
{
struct pipe_proto *p = (struct pipe_proto *) P;
rt_unlock_table(p->peer);
}
static struct proto *
pipe_init(struct proto_config *C)
{
struct pipe_config *c = (struct pipe_config *) C;
struct proto *P = proto_new(C, sizeof(struct pipe_proto));
struct pipe_proto *p = (struct pipe_proto *) P;
bzero(&P->stats, sizeof(struct proto_stats));
bzero(&p->peer_stats, sizeof(struct proto_stats));
p->peer = c->peer->table;
p->mode = c->mode;
P->accept_ra_types = (p->mode == PIPE_OPAQUE) ? RA_OPTIMAL : RA_ANY;
P->rt_notify = pipe_rt_notify;
P->import_control = pipe_import_control;
P->reload_routes = pipe_reload_routes;
P->main_ahook = NULL;
p->peer_ahook = NULL;
return P;
rt_unlock_table(P->table);
rt_unlock_table(p->peer_table);
}
static void
@ -165,16 +189,34 @@ pipe_postconfig(struct proto_config *C)
cf_error("Primary table and peer table must be different");
}
extern int proto_reconfig_type;
static int
pipe_reconfigure(struct proto *P, struct proto_config *new)
{
// struct pipe_proto *p = (struct pipe_proto *) P;
struct pipe_config *o = (struct pipe_config *) P->cf;
struct pipe_config *n = (struct pipe_config *) new;
struct pipe_proto *p = (struct pipe_proto *)P;
struct proto_config *old = P->cf;
struct pipe_config *oc = (struct pipe_config *) old;
struct pipe_config *nc = (struct pipe_config *) new;
if ((o->peer->table != n->peer->table) || (o->mode != n->mode))
if ((oc->peer->table != nc->peer->table) || (oc->mode != nc->mode))
return 0;
/* Update output filters in ahooks */
if (P->main_ahook)
P->main_ahook->out_filter = new->out_filter;
if (p->peer_ahook)
p->peer_ahook->out_filter = new->in_filter;
if ((P->proto_state != PS_UP) || (proto_reconfig_type == RECONFIG_SOFT))
return 1;
if ((new->preference != old->preference)
|| ! filter_same(new->in_filter, old->in_filter)
|| ! filter_same(new->out_filter, old->out_filter))
proto_request_feeding(P);
return 1;
}
@ -190,19 +232,80 @@ pipe_get_status(struct proto *P, byte *buf)
{
struct pipe_proto *p = (struct pipe_proto *) P;
bsprintf(buf, "%c> %s", (p->mode == PIPE_OPAQUE) ? '-' : '=', p->peer->name);
bsprintf(buf, "%c> %s", (p->mode == PIPE_OPAQUE) ? '-' : '=', p->peer_table->name);
}
static void
pipe_show_stats(struct pipe_proto *p)
{
struct proto_stats *s1 = &p->p.stats;
struct proto_stats *s2 = &p->peer_stats;
/*
* Pipe stats (as anything related to pipes) are a bit tricky. There
* are two sets of stats - s1 for ahook to the primary routing and
* s2 for the ahook to the secondary routing table. The user point
* of view is that routes going from the primary routing table to
* the secondary routing table are 'exported', while routes going in
* the other direction are 'imported'.
*
* Each route going through a pipe is, technically, first exported
* to the pipe and then imported from that pipe and such operations
* are counted in one set of stats according to the direction of the
* route propagation. Filtering is done just in the first part
* (export). Therefore, we compose stats for one directon for one
* user direction from both import and export stats, skipping
* immediate and irrelevant steps (exp_updates_accepted,
* imp_updates_received, imp_updates_filtered, ...).
*
* Rule of thumb is that stats s1 have the correct 'polarity'
* (imp/exp), while stats s2 have switched 'polarity'.
*/
cli_msg(-1006, " Routes: %u imported, %u exported",
s1->imp_routes, s2->imp_routes);
cli_msg(-1006, " Route change stats: received rejected filtered ignored accepted");
cli_msg(-1006, " Import updates: %10u %10u %10u %10u %10u",
s2->exp_updates_received, s2->exp_updates_rejected + s1->imp_updates_invalid,
s2->exp_updates_filtered, s1->imp_updates_ignored, s1->imp_updates_accepted);
cli_msg(-1006, " Import withdraws: %10u %10u --- %10u %10u",
s2->exp_withdraws_received, s1->imp_withdraws_invalid,
s1->imp_withdraws_ignored, s1->imp_withdraws_accepted);
cli_msg(-1006, " Export updates: %10u %10u %10u %10u %10u",
s1->exp_updates_received, s1->exp_updates_rejected + s2->imp_updates_invalid,
s1->exp_updates_filtered, s2->imp_updates_ignored, s2->imp_updates_accepted);
cli_msg(-1006, " Export withdraws: %10u %10u --- %10u %10u",
s1->exp_withdraws_received, s2->imp_withdraws_invalid,
s2->imp_withdraws_ignored, s2->imp_withdraws_accepted);
}
static void
pipe_show_proto_info(struct proto *P)
{
struct pipe_proto *p = (struct pipe_proto *) P;
// cli_msg(-1006, " Table: %s", P->table->name);
// cli_msg(-1006, " Peer table: %s", p->peer_table->name);
cli_msg(-1006, " Preference: %d", P->preference);
cli_msg(-1006, " Input filter: %s", filter_name(P->cf->in_filter));
cli_msg(-1006, " Output filter: %s", filter_name(P->cf->out_filter));
if (P->proto_state != PS_DOWN)
pipe_show_stats(p);
}
struct protocol proto_pipe = {
name: "Pipe",
template: "pipe%d",
preference: DEF_PREF_PIPE,
postconfig: pipe_postconfig,
init: pipe_init,
start: pipe_start,
cleanup: pipe_cleanup,
reconfigure: pipe_reconfigure,
copy_config: pipe_copy_config,
get_status: pipe_get_status,
name: "Pipe",
template: "pipe%d",
multitable: 1,
preference: DEF_PREF_PIPE,
postconfig: pipe_postconfig,
init: pipe_init,
start: pipe_start,
cleanup: pipe_cleanup,
reconfigure: pipe_reconfigure,
copy_config: pipe_copy_config,
get_status: pipe_get_status,
show_proto_info: pipe_show_proto_info
};

9
proto/pipe/pipe.h
View File

@ -20,7 +20,8 @@ struct pipe_config {
struct pipe_proto {
struct proto p;
struct rtable *peer;
struct rtable *peer_table;
struct announce_hook *peer_ahook; /* Announce hook for direction peer->primary */
struct proto_stats peer_stats; /* Statistics for the direction peer->primary */
int mode; /* PIPE_OPAQUE or PIPE_TRANSPARENT */
};
@ -31,10 +32,4 @@ extern struct protocol proto_pipe;
static inline int proto_is_pipe(struct proto *p)
{ return p->proto == &proto_pipe; }
static inline struct rtable * pipe_get_peer_table(struct proto *P)
{ return ((struct pipe_proto *) P)->peer; }
static inline struct proto_stats * pipe_get_peer_stats(struct proto *P)
{ return &((struct pipe_proto *) P)->peer_stats; }
#endif