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KRT: Using obligatory export table when non-trivial filters are applied.

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When the kernel filter is anything more sophisticated than FILTER_ACCEPT
or FILTER_REJECT, we should ensure that the old route being sent to the
kernel protocol is really what was sent there before. This fixes the old
misbehavior when an unfiltered old route was used.
This commit is contained in:
Maria Matejka 2021-03-20 21:14:54 +01:00
parent 6cbeefc2ac
commit f604915200
4 changed files with 33 additions and 2 deletions
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2
filter/filter.h
View File

@ -68,6 +68,8 @@ void filters_dump_all(void);
#define FILTER_REJECT ((struct filter *) 1)
#define FILTER_UNDEF ((struct filter *) 2) /* Used in BGP */
#define TRIVIAL_FILTER(f) (((f) == FILTER_REJECT) || ((f) == FILTER_ACCEPT))
#define FF_SILENT 2 /* Silent filter execution */
/* Custom route attributes */

2
nest/protocol.h
View File

@ -471,7 +471,7 @@ struct channel_class {
#endif
};
extern struct channel_class channel_bgp;
extern struct channel_class channel_bgp, channel_krt;
struct channel_config {
node n;

11
sysdep/unix/krt.Y
View File

@ -33,6 +33,7 @@ CF_KEYWORDS(KERNEL, PERSIST, SCAN, TIME, LEARN, DEVICE, ROUTES, GRACEFUL, RESTAR
CF_KEYWORDS(INTERFACE, PREFERRED)
%type <i> kern_mp_limit
%type <cc> kern_channel_start kern_proto_channel
CF_GRAMMAR
@ -53,9 +54,17 @@ kern_mp_limit:
| LIMIT expr { $$ = $2; if (($2 <= 0) || ($2 > 255)) cf_error("Merge paths limit must be in range 1-255"); }
;
kern_channel_start: net_type
{
$$ = this_channel = channel_config_get(&channel_krt, net_label[$1], $1, this_proto);
this_proto->net_type = $1;
};
kern_proto_channel: kern_channel_start channel_opt_list channel_end;
kern_item:
proto_item
| proto_channel { this_proto->net_type = $1->net_type; }
| kern_proto_channel
| PERSIST bool { THIS_KRT->persist = $2; }
| SCAN TIME expr {
/* Scan time of 0 means scan on startup only */

20
sysdep/unix/krt.c
View File

@ -1033,6 +1033,11 @@ krt_start(struct proto *P)
default: log(L_ERR "KRT: Tried to start with strange net type: %d", p->p.net_type); return PS_START; break;
}
/* If it is needed, setup out table automagically */
if (!TRIVIAL_FILTER(p->p.main_channel->out_filter))
channel_setup_out_table(p->p.main_channel);
bmap_init(&p->sync_map, p->p.pool, 1024);
bmap_init(&p->seen_map, p->p.pool, 1024);
add_tail(&krt_proto_list, &p->krt_node);
@ -1079,6 +1084,15 @@ krt_shutdown(struct proto *P)
return PS_DOWN;
}
static int
krt_channel_reconfigure(struct channel *C, struct channel_config *CC, int *import_changed UNUSED, int *export_changed)
{
if (!*export_changed)
return 1;
return (TRIVIAL_FILTER(C->out_filter) == TRIVIAL_FILTER(CC->out_filter));
}
static int
krt_reconfigure(struct proto *p, struct proto_config *CF)
{
@ -1151,6 +1165,12 @@ krt_get_attr(const eattr *a, byte *buf, int buflen)
#define MAYBE_MPLS 0
#endif
struct channel_class channel_krt = {
.channel_size = sizeof(struct channel),
.config_size = sizeof(struct channel_config),
.reconfigure = krt_channel_reconfigure,
};
struct protocol proto_unix_kernel = {
.name = "Kernel",
.template = "kernel%d",