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| author | Ondrej Zajicek <santiago@crfreenet.org> | 2010-04-04 15:41:31 +0200 |
|---|---|---|
| committer | Ondrej Zajicek <santiago@crfreenet.org> | 2010-04-04 15:41:31 +0200 |
| commit | c429d4a4ba2cc8778634461e8adea33e0f0ae022 (patch) | |
| tree | 5cc8102345bf3ce872da92aca84fa63cf67c4e20 /sysdep/unix | |
| parent | d2d2b5d2ae43f608d03304d280367b658650138b (diff) | |
| download | bird-c429d4a4ba2cc8778634461e8adea33e0f0ae022.tar bird-c429d4a4ba2cc8778634461e8adea33e0f0ae022.zip | |
Restrict export of device routes to the kernel protocol.
In usual configuration, such export is already restricted
with the aid of the direct protocol but there are some
races that can circumvent it. This makes it harder to
break kernel device routes. Also adds an option to
disable this restriction.
Diffstat (limited to 'sysdep/unix')
| -rw-r--r-- | sysdep/unix/krt.Y | 3 | ||||
| -rw-r--r-- | sysdep/unix/krt.c | 22 | ||||
| -rw-r--r-- | sysdep/unix/krt.h | 1 |
3 files changed, 23 insertions, 3 deletions
diff --git a/sysdep/unix/krt.Y b/sysdep/unix/krt.Y index 40f1af9..0375a13 100644 --- a/sysdep/unix/krt.Y +++ b/sysdep/unix/krt.Y @@ -17,7 +17,7 @@ CF_DEFINES CF_DECLS -CF_KEYWORDS(KERNEL, PERSIST, SCAN, TIME, LEARN, DEVICE) +CF_KEYWORDS(KERNEL, PERSIST, SCAN, TIME, LEARN, DEVICE, ROUTES) CF_GRAMMAR @@ -56,6 +56,7 @@ kern_item: cf_error("Learning of kernel routes not supported in this configuration"); #endif } + | DEVICE ROUTES bool { THIS_KRT->devroutes = $3; } ; /* Kernel interface protocol */ diff --git a/sysdep/unix/krt.c b/sysdep/unix/krt.c index c8887b7..419bdd9 100644 --- a/sysdep/unix/krt.c +++ b/sysdep/unix/krt.c @@ -734,6 +734,25 @@ krt_scan(timer *t UNUSED) /* * Updates */ +static int +krt_import_control(struct proto *P, rte **new, ea_list **attrs, struct linpool *pool) +{ + struct krt_proto *p = (struct krt_proto *) P; + rte *e = *new; + + if (e->attrs->proto == P) + return -1; + + if (!KRT_CF->devroutes && + (e->attrs->dest == RTD_DEVICE) && + (e->attrs->source != RTS_STATIC_DEVICE)) + return -1; + + if (!krt_capable(e)) + return -1; + + return 0; +} static void krt_notify(struct proto *P, struct rtable *table UNUSED, net *net, @@ -743,8 +762,6 @@ krt_notify(struct proto *P, struct rtable *table UNUSED, net *net, if (shutting_down) return; - if (new && (!krt_capable(new) || new->attrs->source == RTS_INHERIT)) - new = NULL; if (!(net->n.flags & KRF_INSTALLED)) old = NULL; if (new) @@ -871,6 +888,7 @@ krt_init(struct proto_config *c) struct krt_proto *p = proto_new(c, sizeof(struct krt_proto)); p->p.accept_ra_types = RA_OPTIMAL; + p->p.import_control = krt_import_control; p->p.rt_notify = krt_notify; return &p->p; } diff --git a/sysdep/unix/krt.h b/sysdep/unix/krt.h index 1d9e144..ed61621 100644 --- a/sysdep/unix/krt.h +++ b/sysdep/unix/krt.h @@ -47,6 +47,7 @@ struct krt_config { int persist; /* Keep routes when we exit */ int scan_time; /* How often we re-scan routes */ int learn; /* Learn routes from other sources */ + int devroutes; /* Allow export of device routes */ }; struct krt_proto { |