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bird/proto/ospf/ospf.c
Ondrej Zajicek 094d2bdb79 Implements ADD-PATH extension for BGP. 
Allows to send and receive multiple routes for one network by one BGP
session. Also contains necessary core changes to support this (routing
tables accepting several routes for one network from one protocol).
It needs some more cleanup before merging to the master branch.
2012-08-14 16:46:43 +02:00

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/*
* BIRD -- OSPF
*
* (c) 1999--2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: Open Shortest Path First (OSPF)
*
* The OSPF protocol is quite complicated and its complex implemenation is
* split to many files. In |ospf.c|, you will find mainly the interface
* for communication with the core (e.g., reconfiguration hooks, shutdown
* and initialisation and so on). In |packet.c|, you will find various
* functions for sending and receiving generic OSPF packets. There are
* also routines for authentication and checksumming. File |iface.c| contains
* the interface state machine and functions for allocation and deallocation of OSPF's
* interface data structures. Source |neighbor.c| includes the neighbor state
* machine and functions for election of Designated Router and Backup
* Designated router. In |hello.c|, there are routines for sending
* and receiving of hello packets as well as functions for maintaining
* wait times and the inactivity timer. Files |lsreq.c|, |lsack.c|, |dbdes.c|
* contain functions for sending and receiving of link-state requests,
* link-state acknowledgements and database descriptions respectively.
* In |lsupd.c|, there are functions for sending and receiving
* of link-state updates and also the flooding algorithm. Source |topology.c| is
* a place where routines for searching LSAs in the link-state database,
* adding and deleting them reside, there also are functions for originating
* of various types of LSAs (router LSA, net LSA, external LSA). File |rt.c|
* contains routines for calculating the routing table. |lsalib.c| is a set
* of various functions for working with the LSAs (endianity conversions,
* calculation of checksum etc.).
*
* One instance of the protocol is able to hold LSA databases for
* multiple OSPF areas, to exchange routing information between
* multiple neighbors and to calculate the routing tables. The core
* structure is &proto_ospf to which multiple &ospf_area and
* &ospf_iface structures are connected. &ospf_area is also connected to
* &top_hash_graph which is a dynamic hashing structure that
* describes the link-state database. It allows fast search, addition
* and deletion. Each LSA is kept in two pieces: header and body. Both of them are
* kept in the endianity of the CPU.
*
* In OSPFv2 specification, it is implied that there is one IP prefix
* for each physical network/interface (unless it is an ptp link). But
* in modern systems, there might be more independent IP prefixes
* associated with an interface. To handle this situation, we have
* one &ospf_iface for each active IP prefix (instead for each active
* iface); This behaves like virtual interface for the purpose of OSPF.
* If we receive packet, we associate it with a proper virtual interface
* mainly according to its source address.
*
* OSPF keeps one socket per &ospf_iface. This allows us (compared to
* one socket approach) to evade problems with a limit of multicast
* groups per socket and with sending multicast packets to appropriate
* interface in a portable way. The socket is associated with
* underlying physical iface and should not receive packets received
* on other ifaces (unfortunately, this is not true on
* BSD). Generally, one packet can be received by more sockets (for
* example, if there are more &ospf_iface on one physical iface),
* therefore we explicitly filter received packets according to
* src/dst IP address and received iface.
*
* Vlinks are implemented using particularly degenerate form of
* &ospf_iface, which has several exceptions: it does not have its
* iface or socket (it copies these from 'parent' &ospf_iface) and it
* is present in iface list even when down (it is not freed in
* ospf_iface_down()).
*
* The heart beat of ospf is ospf_disp(). It is called at regular intervals
* (&proto_ospf->tick). It is responsible for aging and flushing of LSAs in
* the database, for routing table calculaction and it call area_disp() of every
* ospf_area.
*
* The function area_disp() is
* responsible for late originating of router LSA and network LSA
* and for cleanup before routing table calculation process in
* the area.
* To every &ospf_iface, we connect one or more
* &ospf_neighbor's -- a structure containing many timers and queues
* for building adjacency and for exchange of routing messages.
*
* BIRD's OSPF implementation respects RFC2328 in every detail, but
* some of internal algorithms do differ. The RFC recommends making a snapshot
* of the link-state database when a new adjacency is forming and sending
* the database description packets based on the information in this
* snapshot. The database can be quite large in some networks, so
* rather we walk through a &slist structure which allows us to
* continue even if the actual LSA we were working with is deleted. New
* LSAs are added at the tail of this &slist.
*
* We also don't keep a separate OSPF routing table, because the core
* helps us by being able to recognize when a route is updated
* to an identical one and it suppresses the update automatically.
* Due to this, we can flush all the routes we've recalculated and
* also those we've deleted to the core's routing table and the
* core will take care of the rest. This simplifies the process
* and conserves memory.
*/
#include <stdlib.h>
#include "ospf.h"
static int ospf_reload_routes(struct proto *p);
static void ospf_rt_notify(struct proto *p, struct rtable *table UNUSED, net * n, rte * new, rte * old UNUSED, ea_list * attrs);
static int ospf_rte_better(struct rte *new, struct rte *old);
static int ospf_rte_same(struct rte *new, struct rte *old);
static void ospf_disp(timer *timer);
static void
ospf_area_initfib(struct fib_node *fn)
{
struct area_net *an = (struct area_net *) fn;
an->hidden = 0;
an->active = -1; /* Force to regenerate summary lsa */
/* ac->oldactive will be rewritten by ospf_rt_spf() */
}
static void
add_area_nets(struct ospf_area *oa, struct ospf_area_config *ac)
{
struct proto_ospf *po = oa->po;
struct area_net_config *anc;
struct area_net *an;
fib_init(&oa->net_fib, po->proto.pool, sizeof(struct area_net), 0, ospf_area_initfib);
fib_init(&oa->enet_fib, po->proto.pool, sizeof(struct area_net), 0, ospf_area_initfib);
WALK_LIST(anc, ac->net_list)
{
an = (struct area_net *) fib_get(&oa->net_fib, &anc->px.addr, anc->px.len);
an->hidden = anc->hidden;
}
WALK_LIST(anc, ac->enet_list)
{
an = (struct area_net *) fib_get(&oa->enet_fib, &anc->px.addr, anc->px.len);
an->hidden = anc->hidden;
an->tag = anc->tag;
}
}
static void
ospf_area_add(struct proto_ospf *po, struct ospf_area_config *ac, int reconf)
{
struct proto *p = &po->proto;
struct ospf_area *oa;
OSPF_TRACE(D_EVENTS, "Adding area %R", ac->areaid);
oa = mb_allocz(p->pool, sizeof(struct ospf_area));
add_tail(&po->area_list, NODE oa);
po->areano++;
oa->ac = ac;
oa->areaid = ac->areaid;
oa->rt = NULL;
oa->po = po;
fib_init(&oa->rtr, p->pool, sizeof(ort), 0, ospf_rt_initort);
add_area_nets(oa, ac);
if (oa->areaid == 0)
po->backbone = oa;
#ifdef OSPFv2
oa->options = ac->type;
#else /* OSPFv3 */
oa->options = OPT_R | ac->type | OPT_V6;
#endif
/*
* Set E-bit for NSSA ABR routers. No need to explicitly call
* schedule_rt_lsa() for other areas, will be done anyway.
* We use cf->abr because po->areano is not yet complete.
*/
if (oa_is_nssa(oa) && ((struct ospf_config *) (p->cf))->abr)
po->ebit = 1;
if (reconf)
ospf_ifaces_reconfigure(oa, ac);
}
static void
ospf_area_remove(struct ospf_area *oa)
{
struct proto *p = &oa->po->proto;
OSPF_TRACE(D_EVENTS, "Removing area %R", oa->areaid);
/* We suppose that interfaces are already removed */
ospf_flush_area(oa->po, oa->areaid);
fib_free(&oa->rtr);
fib_free(&oa->net_fib);
fib_free(&oa->enet_fib);
if (oa->translator_timer)
rfree(oa->translator_timer);
oa->po->areano--;
rem_node(NODE oa);
mb_free(oa);
}
struct ospf_area *
ospf_find_area(struct proto_ospf *po, u32 aid)
{
struct ospf_area *oa;
WALK_LIST(oa, po->area_list)
if (((struct ospf_area *) oa)->areaid == aid)
return oa;
return NULL;
}
static struct ospf_iface *
ospf_find_vlink(struct proto_ospf *po, u32 voa, u32 vid)
{
struct ospf_iface *ifa;
WALK_LIST(ifa, po->iface_list)
if ((ifa->type == OSPF_IT_VLINK) && (ifa->voa->areaid == voa) && (ifa->vid == vid))
return ifa;
return NULL;
}
static int
ospf_start(struct proto *p)
{
struct proto_ospf *po = (struct proto_ospf *) p;
struct ospf_config *c = (struct ospf_config *) (p->cf);
struct ospf_area_config *ac;
po->router_id = proto_get_router_id(p->cf);
po->rfc1583 = c->rfc1583;
po->ebit = 0;
po->ecmp = c->ecmp;
po->tick = c->tick;
po->disp_timer = tm_new(p->pool);
po->disp_timer->data = po;
po->disp_timer->randomize = 0;
po->disp_timer->hook = ospf_disp;
po->disp_timer->recurrent = po->tick;
tm_start(po->disp_timer, 1);
po->lsab_size = 256;
po->lsab_used = 0;
po->lsab = mb_alloc(p->pool, po->lsab_size);
po->nhpool = lp_new(p->pool, 12*sizeof(struct mpnh));
init_list(&(po->iface_list));
init_list(&(po->area_list));
fib_init(&po->rtf, p->pool, sizeof(ort), 0, ospf_rt_initort);
po->areano = 0;
po->gr = ospf_top_new(p->pool);
s_init_list(&(po->lsal));
WALK_LIST(ac, c->area_list)
ospf_area_add(po, ac, 0);
/* Add all virtual links */
struct ospf_iface_patt *ic;
WALK_LIST(ic, c->vlink_list)
ospf_iface_new(po->backbone, NULL, ic);
return PS_UP;
}
static void
ospf_dump(struct proto *p)
{
struct ospf_iface *ifa;
struct ospf_neighbor *n;
struct proto_ospf *po = (struct proto_ospf *) p;
OSPF_TRACE(D_EVENTS, "Area number: %d", po->areano);
WALK_LIST(ifa, po->iface_list)
{
OSPF_TRACE(D_EVENTS, "Interface: %s", (ifa->iface ? ifa->iface->name : "(null)"));
OSPF_TRACE(D_EVENTS, "state: %u", ifa->state);
OSPF_TRACE(D_EVENTS, "DR: %R", ifa->drid);
OSPF_TRACE(D_EVENTS, "BDR: %R", ifa->bdrid);
WALK_LIST(n, ifa->neigh_list)
{
OSPF_TRACE(D_EVENTS, " neighbor %R in state %u", n->rid, n->state);
}
}
/*
OSPF_TRACE(D_EVENTS, "LSA graph dump start:");
ospf_top_dump(po->gr, p);
OSPF_TRACE(D_EVENTS, "LSA graph dump finished");
*/
neigh_dump_all();
}
static struct proto *
ospf_init(struct proto_config *c)
{
struct proto *p = proto_new(c, sizeof(struct proto_ospf));
p->accept_ra_types = RA_OPTIMAL;
p->rt_notify = ospf_rt_notify;
p->if_notify = ospf_if_notify;
p->ifa_notify = ospf_ifa_notify;
p->import_control = ospf_import_control;
p->reload_routes = ospf_reload_routes;
p->make_tmp_attrs = ospf_make_tmp_attrs;
p->store_tmp_attrs = ospf_store_tmp_attrs;
p->rte_better = ospf_rte_better;
p->rte_same = ospf_rte_same;
return p;
}
/* If new is better return 1 */
static int
ospf_rte_better(struct rte *new, struct rte *old)
{
if (new->u.ospf.metric1 == LSINFINITY)
return 0;
if(new->attrs->source < old->attrs->source) return 1;
if(new->attrs->source > old->attrs->source) return 0;
if(new->attrs->source == RTS_OSPF_EXT2)
{
if(new->u.ospf.metric2 < old->u.ospf.metric2) return 1;
if(new->u.ospf.metric2 > old->u.ospf.metric2) return 0;
}
if (new->u.ospf.metric1 < old->u.ospf.metric1)
return 1;
return 0; /* Old is shorter or same */
}
static int
ospf_rte_same(struct rte *new, struct rte *old)
{
/* new->attrs == old->attrs always */
return
new->u.ospf.metric1 == old->u.ospf.metric1 &&
new->u.ospf.metric2 == old->u.ospf.metric2 &&
new->u.ospf.tag == old->u.ospf.tag &&
new->u.ospf.router_id == old->u.ospf.router_id;
}
static ea_list *
ospf_build_attrs(ea_list * next, struct linpool *pool, u32 m1, u32 m2,
u32 tag, u32 rid)
{
struct ea_list *l =
lp_alloc(pool, sizeof(struct ea_list) + 4 * sizeof(eattr));
l->next = next;
l->flags = EALF_SORTED;
l->count = 4;
l->attrs[0].id = EA_OSPF_METRIC1;
l->attrs[0].flags = 0;
l->attrs[0].type = EAF_TYPE_INT | EAF_TEMP;
l->attrs[0].u.data = m1;
l->attrs[1].id = EA_OSPF_METRIC2;
l->attrs[1].flags = 0;
l->attrs[1].type = EAF_TYPE_INT | EAF_TEMP;
l->attrs[1].u.data = m2;
l->attrs[2].id = EA_OSPF_TAG;
l->attrs[2].flags = 0;
l->attrs[2].type = EAF_TYPE_INT | EAF_TEMP;
l->attrs[2].u.data = tag;
l->attrs[3].id = EA_OSPF_ROUTER_ID;
l->attrs[3].flags = 0;
l->attrs[3].type = EAF_TYPE_ROUTER_ID | EAF_TEMP;
l->attrs[3].u.data = rid;
return l;
}
void
schedule_net_lsa(struct ospf_iface *ifa)
{
struct proto *p = &ifa->oa->po->proto;
OSPF_TRACE(D_EVENTS, "Scheduling network-LSA origination for iface %s", ifa->iface->name);
ifa->orignet = 1;
}
#ifdef OSPFv3
void
schedule_link_lsa(struct ospf_iface *ifa)
{
struct proto *p = &ifa->oa->po->proto;
OSPF_TRACE(D_EVENTS, "Scheduling link-LSA origination for iface %s", ifa->iface->name);
ifa->origlink = 1;
}
#endif
void
schedule_rt_lsa(struct ospf_area *oa)
{
struct proto *p = &oa->po->proto;
OSPF_TRACE(D_EVENTS, "Scheduling router-LSA origination for area %R", oa->areaid);
oa->origrt = 1;
}
void
schedule_rtcalc(struct proto_ospf *po)
{
struct proto *p = &po->proto;
if (po->calcrt)
return;
OSPF_TRACE(D_EVENTS, "Scheduling routing table calculation");
po->calcrt = 1;
}
static int
ospf_reload_routes(struct proto *p)
{
struct proto_ospf *po = (struct proto_ospf *) p;
if (po->calcrt != 2)
OSPF_TRACE(D_EVENTS, "Scheduling routing table calculation with route reload");
po->calcrt = 2;
return 1;
}
/**
* area_disp - invokes origination of
* router LSA and routing table cleanup
* @oa: ospf area
*
* It invokes aging and when @ospf_area->origrt is set to 1, start
* function for origination of router, network LSAs.
*/
void
area_disp(struct ospf_area *oa)
{
struct proto_ospf *po = oa->po;
struct ospf_iface *ifa;
/* Now try to originage rt_lsa */
if (oa->origrt)
update_rt_lsa(oa);
/* Now try to originate network LSA's */
WALK_LIST(ifa, po->iface_list)
{
#ifdef OSPFv3
/* Link LSA should be originated before Network LSA */
if (ifa->origlink && (ifa->oa == oa))
update_link_lsa(ifa);
#endif
if (ifa->orignet && (ifa->oa == oa))
update_net_lsa(ifa);
}
}
/**
* ospf_disp - invokes routing table calculation, aging and also area_disp()
* @timer: timer usually called every @proto_ospf->tick second, @timer->data
* point to @proto_ospf
*/
void
ospf_disp(timer * timer)
{
struct proto_ospf *po = timer->data;
struct ospf_area *oa;
WALK_LIST(oa, po->area_list)
area_disp(oa);
/* Age LSA DB */
ospf_age(po);
/* Calculate routing table */
if (po->calcrt)
ospf_rt_spf(po);
}
/**
* ospf_import_control - accept or reject new route from nest's routing table
* @p: current instance of protocol
* @new: the new route
* @attrs: list of attributes
* @pool: pool for allocation of attributes
*
* Its quite simple. It does not accept our own routes and leaves the decision on
* import to the filters.
*/
int
ospf_import_control(struct proto *p, rte ** new, ea_list ** attrs,
struct linpool *pool)
{
struct ospf_area *oa = ospf_main_area((struct proto_ospf *) p);
rte *e = *new;
if (e->attrs->src->proto == p)
return -1; /* Reject our own routes */
if (oa_is_stub(oa))
return -1; /* Do not export routes to stub areas */
eattr *ea = ea_find(e->attrs->eattrs, EA_GEN_IGP_METRIC);
u32 m1 = (ea && (ea->u.data < LSINFINITY)) ? ea->u.data : LSINFINITY;
*attrs = ospf_build_attrs(*attrs, pool, m1, 10000, 0, 0);
return 0; /* Leave decision to the filters */
}
struct ea_list *
ospf_make_tmp_attrs(struct rte *rt, struct linpool *pool)
{
return ospf_build_attrs(NULL, pool, rt->u.ospf.metric1, rt->u.ospf.metric2,
rt->u.ospf.tag, rt->u.ospf.router_id);
}
void
ospf_store_tmp_attrs(struct rte *rt, struct ea_list *attrs)
{
rt->u.ospf.metric1 = ea_get_int(attrs, EA_OSPF_METRIC1, LSINFINITY);
rt->u.ospf.metric2 = ea_get_int(attrs, EA_OSPF_METRIC2, 10000);
rt->u.ospf.tag = ea_get_int(attrs, EA_OSPF_TAG, 0);
rt->u.ospf.router_id = ea_get_int(attrs, EA_OSPF_ROUTER_ID, 0);
}
/**
* ospf_shutdown - Finish of OSPF instance
* @p: current instance of protocol
*
* RFC does not define any action that should be taken before router
* shutdown. To make my neighbors react as fast as possible, I send
* them hello packet with empty neighbor list. They should start
* their neighbor state machine with event %NEIGHBOR_1WAY.
*/
static int
ospf_shutdown(struct proto *p)
{
struct proto_ospf *po = (struct proto_ospf *) p;
struct ospf_iface *ifa;
OSPF_TRACE(D_EVENTS, "Shutdown requested");
/* And send to all my neighbors 1WAY */
WALK_LIST(ifa, po->iface_list)
ospf_iface_shutdown(ifa);
/* Cleanup locked rta entries */
FIB_WALK(&po->rtf, nftmp)
{
rta_free(((ort *) nftmp)->old_rta);
}
FIB_WALK_END;
return PS_DOWN;
}
static void
ospf_rt_notify(struct proto *p, rtable *tbl UNUSED, net * n, rte * new, rte * old UNUSED, ea_list * attrs)
{
struct proto_ospf *po = (struct proto_ospf *) p;
struct ospf_area *oa = ospf_main_area(po);
ort *nf = (ort *) fib_get(&po->rtf, &n->n.prefix, n->n.pxlen);
struct fib_node *fn = &nf->fn;
if (!new)
{
if (fn->x1 != EXT_EXPORT)
return;
flush_ext_lsa(oa, fn, oa_is_nssa(oa));
/* Old external route might blocked some NSSA translation */
if (po->areano > 1)
schedule_rtcalc(po);
return;
}
/* Get route attributes */
u32 m1 = ea_get_int(attrs, EA_OSPF_METRIC1, LSINFINITY);
u32 m2 = ea_get_int(attrs, EA_OSPF_METRIC2, 10000);
u32 metric = (m1 != LSINFINITY) ? m1 : (m2 | LSA_EXT_EBIT);
u32 tag = ea_get_int(attrs, EA_OSPF_TAG, 0);
ip_addr gw = IPA_NONE;
// FIXME check for gw should be per ifa, not per iface
if ((new->attrs->dest == RTD_ROUTER) &&
ipa_nonzero(new->attrs->gw) &&
!ipa_has_link_scope(new->attrs->gw) &&
(ospf_iface_find((struct proto_ospf *) p, new->attrs->iface) != NULL))
gw = new->attrs->gw;
originate_ext_lsa(oa, fn, EXT_EXPORT, metric, gw, tag, 1);
}
static void
ospf_get_status(struct proto *p, byte * buf)
{
struct proto_ospf *po = (struct proto_ospf *) p;
if (p->proto_state == PS_DOWN)
buf[0] = 0;
else
{
struct ospf_iface *ifa;
struct ospf_neighbor *n;
int adj = 0;
WALK_LIST(ifa, po->iface_list)
WALK_LIST(n, ifa->neigh_list) if (n->state == NEIGHBOR_FULL)
adj = 1;
if (adj == 0)
strcpy(buf, "Alone");
else
strcpy(buf, "Running");
}
}
static void
ospf_get_route_info(rte * rte, byte * buf, ea_list * attrs UNUSED)
{
char *type = "<bug>";
switch(rte->attrs->source)
{
case RTS_OSPF:
type = "I";
break;
case RTS_OSPF_IA:
type = "IA";
break;
case RTS_OSPF_EXT1:
type = "E1";
break;
case RTS_OSPF_EXT2:
type = "E2";
break;
}
buf += bsprintf(buf, " %s", type);
buf += bsprintf(buf, " (%d/%d", rte->pref, rte->u.ospf.metric1);
if (rte->attrs->source == RTS_OSPF_EXT2)
buf += bsprintf(buf, "/%d", rte->u.ospf.metric2);
buf += bsprintf(buf, ")");
if ((rte->attrs->source == RTS_OSPF_EXT1 || rte->attrs->source == RTS_OSPF_EXT2) && rte->u.ospf.tag)
{
buf += bsprintf(buf, " [%x]", rte->u.ospf.tag);
}
if (rte->u.ospf.router_id)
buf += bsprintf(buf, " [%R]", rte->u.ospf.router_id);
}
static int
ospf_get_attr(eattr * a, byte * buf, int buflen UNUSED)
{
switch (a->id)
{
case EA_OSPF_METRIC1:
bsprintf(buf, "metric1");
return GA_NAME;
case EA_OSPF_METRIC2:
bsprintf(buf, "metric2");
return GA_NAME;
case EA_OSPF_TAG:
bsprintf(buf, "tag: 0x%08x", a->u.data);
return GA_FULL;
case EA_OSPF_ROUTER_ID:
bsprintf(buf, "router_id");
return GA_NAME;
default:
return GA_UNKNOWN;
}
}
static void
ospf_area_reconfigure(struct ospf_area *oa, struct ospf_area_config *nac)
{
oa->ac = nac;
// FIXME better area type reconfiguration
#ifdef OSPFv2
oa->options = nac->type;
#else /* OSPFv3 */
oa->options = OPT_R | nac->type | OPT_V6;
#endif
if (oa_is_nssa(oa) && (oa->po->areano > 1))
oa->po->ebit = 1;
ospf_ifaces_reconfigure(oa, nac);
/* Handle net_list */
fib_free(&oa->net_fib);
fib_free(&oa->enet_fib);
add_area_nets(oa, nac);
/* No need to handle stubnet_list */
oa->marked = 0;
schedule_rt_lsa(oa);
}
/**
* ospf_reconfigure - reconfiguration hook
* @p: current instance of protocol (with old configuration)
* @c: new configuration requested by user
*
* This hook tries to be a little bit intelligent. Instance of OSPF
* will survive change of many constants like hello interval,
* password change, addition or deletion of some neighbor on
* nonbroadcast network, cost of interface, etc.
*/
static int
ospf_reconfigure(struct proto *p, struct proto_config *c)
{
struct proto_ospf *po = (struct proto_ospf *) p;
struct ospf_config *old = (struct ospf_config *) (p->cf);
struct ospf_config *new = (struct ospf_config *) c;
struct ospf_area_config *nac;
struct ospf_area *oa, *oax;
struct ospf_iface *ifa, *ifx;
struct ospf_iface_patt *ip;
if (po->rfc1583 != new->rfc1583)
return 0;
if (old->abr != new->abr)
return 0;
po->ecmp = new->ecmp;
po->tick = new->tick;
po->disp_timer->recurrent = po->tick;
tm_start(po->disp_timer, 1);
/* Mark all areas and ifaces */
WALK_LIST(oa, po->area_list)
oa->marked = 1;
WALK_LIST(ifa, po->iface_list)
ifa->marked = 1;
/* Add and update areas */
WALK_LIST(nac, new->area_list)
{
oa = ospf_find_area(po, nac->areaid);
if (oa)
ospf_area_reconfigure(oa, nac);
else
ospf_area_add(po, nac, 1);
}
/* Add and update vlinks */
WALK_LIST(ip, new->vlink_list)
{
ifa = ospf_find_vlink(po, ip->voa, ip->vid);
if (ifa)
ospf_iface_reconfigure(ifa, ip);
else
ospf_iface_new(po->backbone, NULL, ip);
}
/* Delete remaining ifaces and areas */
WALK_LIST_DELSAFE(ifa, ifx, po->iface_list)
if (ifa->marked)
{
ospf_iface_shutdown(ifa);
ospf_iface_remove(ifa);
}
WALK_LIST_DELSAFE(oa, oax, po->area_list)
if (oa->marked)
ospf_area_remove(oa);
schedule_rtcalc(po);
return 1;
}
void
ospf_sh_neigh(struct proto *p, char *iff)
{
struct ospf_iface *ifa = NULL;
struct ospf_neighbor *n;
struct proto_ospf *po = (struct proto_ospf *) p;
if (p->proto_state != PS_UP)
{
cli_msg(-1013, "%s: is not up", p->name);
cli_msg(0, "");
return;
}
cli_msg(-1013, "%s:", p->name);
cli_msg(-1013, "%-12s\t%3s\t%-15s\t%-5s\t%-10s %-12s", "Router ID", "Pri",
" State", "DTime", "Interface", "Router IP");
WALK_LIST(ifa, po->iface_list)
if ((iff == NULL) || patmatch(iff, ifa->iface->name))
WALK_LIST(n, ifa->neigh_list)
ospf_sh_neigh_info(n);
cli_msg(0, "");
}
void
ospf_sh(struct proto *p)
{
struct ospf_area *oa;
struct proto_ospf *po = (struct proto_ospf *) p;
struct ospf_iface *ifa;
struct ospf_neighbor *n;
int ifano, nno, adjno, firstfib;
struct area_net *anet;
if (p->proto_state != PS_UP)
{
cli_msg(-1014, "%s: is not up", p->name);
cli_msg(0, "");
return;
}
cli_msg(-1014, "%s:", p->name);
cli_msg(-1014, "RFC1583 compatibility: %s", (po->rfc1583 ? "enable" : "disabled"));
cli_msg(-1014, "RT scheduler tick: %d", po->tick);
cli_msg(-1014, "Number of areas: %u", po->areano);
cli_msg(-1014, "Number of LSAs in DB:\t%u", po->gr->hash_entries);
WALK_LIST(oa, po->area_list)
{
cli_msg(-1014, "\tArea: %R (%u) %s", oa->areaid, oa->areaid,
oa->areaid == 0 ? "[BACKBONE]" : "");
ifano = 0;
nno = 0;
adjno = 0;
WALK_LIST(ifa, po->iface_list)
{
if (oa == ifa->oa)
{
ifano++;
WALK_LIST(n, ifa->neigh_list)
{
nno++;
if (n->state == NEIGHBOR_FULL)
adjno++;
}
}
}
cli_msg(-1014, "\t\tStub:\t%s", oa_is_stub(oa) ? "Yes" : "No");
cli_msg(-1014, "\t\tNSSA:\t%s", oa_is_nssa(oa) ? "Yes" : "No");
cli_msg(-1014, "\t\tTransit:\t%s", oa->trcap ? "Yes" : "No");
if (oa_is_nssa(oa))
cli_msg(-1014, "\t\tNSSA translation:\t%s%s", oa->translate ? "Yes" : "No",
oa->translate == TRANS_WAIT ? " (run down)" : "");
cli_msg(-1014, "\t\tNumber of interfaces:\t%u", ifano);
cli_msg(-1014, "\t\tNumber of neighbors:\t%u", nno);
cli_msg(-1014, "\t\tNumber of adjacent neighbors:\t%u", adjno);
firstfib = 1;
FIB_WALK(&oa->net_fib, nftmp)
{
anet = (struct area_net *) nftmp;
if(firstfib)
{
cli_msg(-1014, "\t\tArea networks:");
firstfib = 0;
}
cli_msg(-1014, "\t\t\t%1I/%u\t%s\t%s", anet->fn.prefix, anet->fn.pxlen,
anet->hidden ? "Hidden" : "Advertise", anet->active ? "Active" : "");
}
FIB_WALK_END;
firstfib = 1;
FIB_WALK(&oa->enet_fib, nftmp)
{
anet = (struct area_net *) nftmp;
if(firstfib)
{
cli_msg(-1014, "\t\tArea external networks:");
firstfib = 0;
}
cli_msg(-1014, "\t\t\t%1I/%u\t%s\t%s", anet->fn.prefix, anet->fn.pxlen,
anet->hidden ? "Hidden" : "Advertise", anet->active ? "Active" : "");
}
FIB_WALK_END;
}
cli_msg(0, "");
}
void
ospf_sh_iface(struct proto *p, char *iff)
{
struct proto_ospf *po = (struct proto_ospf *) p;
struct ospf_iface *ifa = NULL;
if (p->proto_state != PS_UP)
{
cli_msg(-1015, "%s: is not up", p->name);
cli_msg(0, "");
return;
}
cli_msg(-1015, "%s:", p->name);
WALK_LIST(ifa, po->iface_list)
if ((iff == NULL) || patmatch(iff, ifa->iface->name))
ospf_iface_info(ifa);
cli_msg(0, "");
}
/* lsa_compare_for_state() - Compare function for 'show ospf state'
*
* First we want to separate network-LSAs and other LSAs (because network-LSAs
* will be presented as network nodes and other LSAs together as router nodes)
* Network-LSAs are sorted according to network prefix, other LSAs are sorted
* according to originating router id (to get all LSA needed to represent one
* router node together). Then, according to LSA type, ID and age.
*
* For OSPFv3, we have to handle also Prefix-LSAs. We would like to put each
* immediately after the referenced LSA. We will make faked LSA based on ref_
* values
*/
#ifdef OSPFv3
static struct ospf_lsa_header *
fake_lsa_from_prefix_lsa(struct ospf_lsa_header *dst, struct ospf_lsa_header *src,
struct ospf_lsa_prefix *px)
{
dst->age = src->age;
dst->type = px->ref_type;
dst->id = px->ref_id;
dst->rt = px->ref_rt;
dst->sn = src->sn;
return dst;
}
#endif
static int
lsa_compare_for_state(const void *p1, const void *p2)
{
struct top_hash_entry * he1 = * (struct top_hash_entry **) p1;
struct top_hash_entry * he2 = * (struct top_hash_entry **) p2;
struct ospf_lsa_header *lsa1 = &(he1->lsa);
struct ospf_lsa_header *lsa2 = &(he2->lsa);
if (he1->domain != he2->domain)
return he1->domain - he2->domain;
#ifdef OSPFv3
struct ospf_lsa_header lsatmp1, lsatmp2;
int px1 = (lsa1->type == LSA_T_PREFIX);
int px2 = (lsa2->type == LSA_T_PREFIX);
if (px1)
lsa1 = fake_lsa_from_prefix_lsa(&lsatmp1, lsa1, he1->lsa_body);
if (px2)
lsa2 = fake_lsa_from_prefix_lsa(&lsatmp2, lsa2, he2->lsa_body);
#endif
int nt1 = (lsa1->type == LSA_T_NET);
int nt2 = (lsa2->type == LSA_T_NET);
if (nt1 != nt2)
return nt1 - nt2;
if (nt1)
{
#ifdef OSPFv3
/* In OSPFv3, neworks are named base on ID of DR */
if (lsa1->rt != lsa2->rt)
return lsa1->rt - lsa2->rt;
#endif
/* For OSPFv2, this is IP of the network,
for OSPFv3, this is interface ID */
if (lsa1->id != lsa2->id)
return lsa1->id - lsa2->id;
#ifdef OSPFv3
if (px1 != px2)
return px1 - px2;
#endif
return lsa1->sn - lsa2->sn;
}
else
{
if (lsa1->rt != lsa2->rt)
return lsa1->rt - lsa2->rt;
if (lsa1->type != lsa2->type)
return lsa1->type - lsa2->type;
if (lsa1->id != lsa2->id)
return lsa1->id - lsa2->id;
#ifdef OSPFv3
if (px1 != px2)
return px1 - px2;
#endif
return lsa1->sn - lsa2->sn;
}
}
static int
ext_compare_for_state(const void *p1, const void *p2)
{
struct top_hash_entry * he1 = * (struct top_hash_entry **) p1;
struct top_hash_entry * he2 = * (struct top_hash_entry **) p2;
struct ospf_lsa_header *lsa1 = &(he1->lsa);
struct ospf_lsa_header *lsa2 = &(he2->lsa);
if (lsa1->rt != lsa2->rt)
return lsa1->rt - lsa2->rt;
if (lsa1->id != lsa2->id)
return lsa1->id - lsa2->id;
return lsa1->sn - lsa2->sn;
}
static inline void
show_lsa_distance(struct top_hash_entry *he)
{
if (he->color == INSPF)
cli_msg(-1016, "\t\tdistance %u", he->dist);
else
cli_msg(-1016, "\t\tunreachable");
}
static inline void
show_lsa_router(struct proto_ospf *po, struct top_hash_entry *he, int first, int verbose)
{
struct ospf_lsa_header *lsa = &(he->lsa);
struct ospf_lsa_rt *rt = he->lsa_body;
struct ospf_lsa_rt_link *rr = (struct ospf_lsa_rt_link *) (rt + 1);
int max = lsa_rt_count(lsa);
int i;
if (first)
{
cli_msg(-1016, "");
cli_msg(-1016, "\trouter %R", he->lsa.rt);
show_lsa_distance(he);
}
for (i = 0; i < max; i++)
if (rr[i].type == LSART_VLNK)
cli_msg(-1016, "\t\tvlink %R metric %u", rr[i].id, rr[i].metric);
for (i = 0; i < max; i++)
if (rr[i].type == LSART_PTP)
cli_msg(-1016, "\t\trouter %R metric %u", rr[i].id, rr[i].metric);
for (i = 0; i < max; i++)
if (rr[i].type == LSART_NET)
{
#ifdef OSPFv2
struct top_hash_entry *net_he = ospf_hash_find_net(po->gr, he->domain, rr[i].id);
if (net_he)
{
struct ospf_lsa_header *net_lsa = &(net_he->lsa);
struct ospf_lsa_net *net_ln = net_he->lsa_body;
cli_msg(-1016, "\t\tnetwork %I/%d metric %u",
ipa_and(ipa_from_u32(net_lsa->id), net_ln->netmask),
ipa_mklen(net_ln->netmask), rr[i].metric);
}
else
cli_msg(-1016, "\t\tnetwork [%R] metric %u", rr[i].id, rr[i].metric);
#else /* OSPFv3 */
cli_msg(-1016, "\t\tnetwork [%R-%u] metric %u", rr[i].id, rr[i].nif, rr[i].metric);
#endif
}
#ifdef OSPFv2
if (!verbose)
return;
for (i = 0; i < max; i++)
if (rr[i].type == LSART_STUB)
cli_msg(-1016, "\t\tstubnet %I/%d metric %u", ipa_from_u32(rr[i].id),
ipa_mklen(ipa_from_u32(rr[i].data)), rr[i].metric);
#endif
}
static inline void
show_lsa_network(struct top_hash_entry *he)
{
struct ospf_lsa_header *lsa = &(he->lsa);
struct ospf_lsa_net *ln = he->lsa_body;
u32 i;
#ifdef OSPFv2
cli_msg(-1016, "");
cli_msg(-1016, "\tnetwork %I/%d", ipa_and(ipa_from_u32(lsa->id), ln->netmask), ipa_mklen(ln->netmask));
cli_msg(-1016, "\t\tdr %R", lsa->rt);
#else /* OSPFv3 */
cli_msg(-1016, "");
cli_msg(-1016, "\tnetwork [%R-%u]", lsa->rt, lsa->id);
#endif
show_lsa_distance(he);
for (i = 0; i < lsa_net_count(lsa); i++)
cli_msg(-1016, "\t\trouter %R", ln->routers[i]);
}
static inline void
show_lsa_sum_net(struct top_hash_entry *he)
{
ip_addr ip;
int pxlen;
#ifdef OSPFv2
struct ospf_lsa_sum *ls = he->lsa_body;
pxlen = ipa_mklen(ls->netmask);
ip = ipa_and(ipa_from_u32(he->lsa.id), ls->netmask);
#else /* OSPFv3 */
u8 pxopts;
u16 rest;
struct ospf_lsa_sum_net *ls = he->lsa_body;
lsa_get_ipv6_prefix(ls->prefix, &ip, &pxlen, &pxopts, &rest);
#endif
cli_msg(-1016, "\t\txnetwork %I/%d metric %u", ip, pxlen, ls->metric);
}
static inline void
show_lsa_sum_rt(struct top_hash_entry *he)
{
u32 dst_rid;
#ifdef OSPFv2
struct ospf_lsa_sum *ls = he->lsa_body;
dst_rid = he->lsa.id;
// options = 0;
#else /* OSPFv3 */
struct ospf_lsa_sum_rt *ls = he->lsa_body;
dst_rid = ls->drid;
// options = ls->options & OPTIONS_MASK;
#endif
cli_msg(-1016, "\t\txrouter %R metric %u", dst_rid, ls->metric);
}
static inline void
show_lsa_external(struct top_hash_entry *he)
{
struct ospf_lsa_ext *ext = he->lsa_body;
char str_via[STD_ADDRESS_P_LENGTH + 8] = "";
char str_tag[16] = "";
ip_addr ip, rt_fwaddr;
int pxlen, ebit, rt_fwaddr_valid;
u32 rt_tag, rt_metric;
if (he->lsa.type == LSA_T_EXT)
he->domain = 0; /* Unmark the LSA */
rt_metric = ext->metric & METRIC_MASK;
ebit = ext->metric & LSA_EXT_EBIT;
#ifdef OSPFv2
ip = ipa_and(ipa_from_u32(he->lsa.id), ext->netmask);
pxlen = ipa_mklen(ext->netmask);
rt_fwaddr = ext->fwaddr;
rt_fwaddr_valid = !ipa_equal(rt_fwaddr, IPA_NONE);
rt_tag = ext->tag;
#else /* OSPFv3 */
u8 pxopts;
u16 rest;
u32 *buf = ext->rest;
buf = lsa_get_ipv6_prefix(buf, &ip, &pxlen, &pxopts, &rest);
rt_fwaddr_valid = ext->metric & LSA_EXT_FBIT;
if (rt_fwaddr_valid)
buf = lsa_get_ipv6_addr(buf, &rt_fwaddr);
else
rt_fwaddr = IPA_NONE;
if (ext->metric & LSA_EXT_TBIT)
rt_tag = *buf++;
else
rt_tag = 0;
#endif
if (rt_fwaddr_valid)
bsprintf(str_via, " via %I", rt_fwaddr);
if (rt_tag)
bsprintf(str_tag, " tag %08x", rt_tag);
cli_msg(-1016, "\t\t%s %I/%d metric%s %u%s%s",
(he->lsa.type == LSA_T_NSSA) ? "nssa-ext" : "external",
ip, pxlen, ebit ? "2" : "", rt_metric, str_via, str_tag);
}
#ifdef OSPFv3
static inline void
show_lsa_prefix(struct top_hash_entry *he, struct ospf_lsa_header *cnode)
{
struct ospf_lsa_prefix *px = he->lsa_body;
ip_addr pxa;
int pxlen;
u8 pxopts;
u16 metric;
u32 *buf;
int i;
/* We check whether given prefix-LSA is related to the current node */
if ((px->ref_type != cnode->type) || (px->ref_rt != cnode->rt))
return;
if ((px->ref_type == LSA_T_RT) && (px->ref_id != 0))
return;
if ((px->ref_type == LSA_T_NET) && (px->ref_id != cnode->id))
return;
buf = px->rest;
for (i = 0; i < px->pxcount; i++)
{
buf = lsa_get_ipv6_prefix(buf, &pxa, &pxlen, &pxopts, &metric);
if (px->ref_type == LSA_T_RT)
cli_msg(-1016, "\t\tstubnet %I/%d metric %u", pxa, pxlen, metric);
else
cli_msg(-1016, "\t\taddress %I/%d", pxa, pxlen);
}
}
#endif
void
ospf_sh_state(struct proto *p, int verbose, int reachable)
{
struct proto_ospf *po = (struct proto_ospf *) p;
struct ospf_lsa_header *cnode = NULL;
int num = po->gr->hash_entries;
unsigned int i, ix, j1, j2, jx;
u32 last_area = 0xFFFFFFFF;
if (p->proto_state != PS_UP)
{
cli_msg(-1016, "%s: is not up", p->name);
cli_msg(0, "");
return;
}
/* We store interesting area-scoped LSAs in array hea and
global-scoped (LSA_T_EXT) LSAs in array hex */
struct top_hash_entry *hea[num];
struct top_hash_entry *hex[verbose ? num : 0];
struct top_hash_entry *he;
j1 = j2 = jx = 0;
WALK_SLIST(he, po->lsal)
{
int accept;
switch (he->lsa.type)
{
case LSA_T_RT:
case LSA_T_NET:
accept = 1;
break;
case LSA_T_SUM_NET:
case LSA_T_SUM_RT:
case LSA_T_NSSA:
#ifdef OSPFv3
case LSA_T_PREFIX:
#endif
accept = verbose;
break;
case LSA_T_EXT:
if (verbose)
{
he->domain = 1; /* Abuse domain field to mark the LSA */
hex[jx++] = he;
}
default:
accept = 0;
}
if (accept)
hea[j1++] = he;
else
j2++;
}
if ((j1 + j2) != num)
die("Fatal mismatch");
qsort(hea, j1, sizeof(struct top_hash_entry *), lsa_compare_for_state);
qsort(hex, jx, sizeof(struct top_hash_entry *), ext_compare_for_state);
/*
* This code is a bit tricky, we have a primary LSAs (router and
* network) that are presented as a node, and secondary LSAs that
* are presented as a part of a primary node. cnode represents an
* currently opened node (whose header was presented). The LSAs are
* sorted to get secondary LSAs just after related primary LSA (if
* available). We present secondary LSAs only when related primary
* LSA is opened.
*
* AS-external LSAs are stored separately as they might be presented
* several times (for each area when related ASBR is opened). When
* the node is closed, related external routes are presented. We
* also have to take into account that in OSPFv3, there might be
* more router-LSAs and only the first should be considered as a
* primary. This is handled by not closing old router-LSA when next
* one is processed (which is not opened because there is already
* one opened).
*/
ix = 0;
for (i = 0; i < j1; i++)
{
he = hea[i];
/* If there is no opened node, we open the LSA (if appropriate) or skip to the next one */
if (!cnode)
{
if (((he->lsa.type == LSA_T_RT) || (he->lsa.type == LSA_T_NET))
&& ((he->color == INSPF) || !reachable))
{
cnode = &(he->lsa);
if (he->domain != last_area)
{
cli_msg(-1016, "");
cli_msg(-1016, "area %R", he->domain);
last_area = he->domain;
ix = 0;
}
}
else
continue;
}
ASSERT(cnode && (he->domain == last_area) && (he->lsa.rt == cnode->rt));
switch (he->lsa.type)
{
case LSA_T_RT:
show_lsa_router(po, he, he->lsa.id == cnode->id, verbose);
break;
case LSA_T_NET:
show_lsa_network(he);
break;
case LSA_T_SUM_NET:
if (cnode->type == LSA_T_RT)
show_lsa_sum_net(he);
break;
case LSA_T_SUM_RT:
if (cnode->type == LSA_T_RT)
show_lsa_sum_rt(he);
break;
#ifdef OSPFv3
case LSA_T_PREFIX:
show_lsa_prefix(he, cnode);
break;
#endif
case LSA_T_EXT:
case LSA_T_NSSA:
show_lsa_external(he);
break;
}
/* In these cases, we close the current node */
if ((i+1 == j1)
|| (hea[i+1]->domain != last_area)
|| (hea[i+1]->lsa.rt != cnode->rt)
|| (hea[i+1]->lsa.type == LSA_T_NET))
{
while ((ix < jx) && (hex[ix]->lsa.rt < cnode->rt))
ix++;
while ((ix < jx) && (hex[ix]->lsa.rt == cnode->rt))
show_lsa_external(hex[ix++]);
cnode = NULL;
}
}
int hdr = 0;
u32 last_rt = 0xFFFFFFFF;
for (ix = 0; ix < jx; ix++)
{
he = hex[ix];
/* If it is still marked, we show it now. */
if (he->domain)
{
he->domain = 0;
if ((he->color != INSPF) && reachable)
continue;
if (!hdr)
{
cli_msg(-1016, "");
cli_msg(-1016, "other ASBRs");
hdr = 1;
}
if (he->lsa.rt != last_rt)
{
cli_msg(-1016, "");
cli_msg(-1016, "\trouter %R", he->lsa.rt);
last_rt = he->lsa.rt;
}
show_lsa_external(he);
}
}
cli_msg(0, "");
}
static int
lsa_compare_for_lsadb(const void *p1, const void *p2)
{
struct top_hash_entry * he1 = * (struct top_hash_entry **) p1;
struct top_hash_entry * he2 = * (struct top_hash_entry **) p2;
struct ospf_lsa_header *lsa1 = &(he1->lsa);
struct ospf_lsa_header *lsa2 = &(he2->lsa);
int sc1 = LSA_SCOPE(lsa1);
int sc2 = LSA_SCOPE(lsa2);
if (sc1 != sc2)
return sc2 - sc1;
if (he1->domain != he2->domain)
return he1->domain - he2->domain;
if (lsa1->rt != lsa2->rt)
return lsa1->rt - lsa2->rt;
if (lsa1->id != lsa2->id)
return lsa1->id - lsa2->id;
if (lsa1->type != lsa2->type)
return lsa1->type - lsa2->type;
return lsa1->sn - lsa2->sn;
}
void
ospf_sh_lsadb(struct lsadb_show_data *ld)
{
struct proto *p = proto_get_named(ld->name, &proto_ospf);
struct proto_ospf *po = (struct proto_ospf *) p;
int num = po->gr->hash_entries;
unsigned int i, j;
int last_dscope = -1;
u32 last_domain = 0;
if (p->proto_state != PS_UP)
{
cli_msg(-1017, "%s: is not up", p->name);
cli_msg(0, "");
return;
}
if (ld->router == SH_ROUTER_SELF)
ld->router = po->router_id;
struct top_hash_entry *hea[num];
struct top_hash_entry *he;
j = 0;
WALK_SLIST(he, po->lsal)
hea[j++] = he;
if (j != num)
die("Fatal mismatch");
qsort(hea, j, sizeof(struct top_hash_entry *), lsa_compare_for_lsadb);
for (i = 0; i < j; i++)
{
struct ospf_lsa_header *lsa = &(hea[i]->lsa);
int dscope = LSA_SCOPE(lsa);
if (ld->scope && (dscope != (ld->scope & 0xf000)))
continue;
if ((ld->scope == LSA_SCOPE_AREA) && (hea[i]->domain != ld->area))
continue;
/* Ignore high nibble */
if (ld->type && ((lsa->type & 0x0fff) != (ld->type & 0x0fff)))
continue;
if (ld->lsid && (lsa->id != ld->lsid))
continue;
if (ld->router && (lsa->rt != ld->router))
continue;
if ((dscope != last_dscope) || (hea[i]->domain != last_domain))
{
cli_msg(-1017, "");
switch (dscope)
{
case LSA_SCOPE_AS:
cli_msg(-1017, "Global");
break;
case LSA_SCOPE_AREA:
cli_msg(-1017, "Area %R", hea[i]->domain);
break;
#ifdef OSPFv3
case LSA_SCOPE_LINK:
{
struct iface *ifa = if_find_by_index(hea[i]->domain);
cli_msg(-1017, "Link %s", (ifa != NULL) ? ifa->name : "?");
}
break;
#endif
}
cli_msg(-1017, "");
cli_msg(-1017," Type LS ID Router Age Sequence Checksum");
last_dscope = dscope;
last_domain = hea[i]->domain;
}
cli_msg(-1017," %04x %-15R %-15R %5u %08x %04x",
lsa->type, lsa->id, lsa->rt, lsa->age, lsa->sn, lsa->checksum);
}
cli_msg(0, "");
}
struct protocol proto_ospf = {
name: "OSPF",
template: "ospf%d",
attr_class: EAP_OSPF,
preference: DEF_PREF_OSPF,
init: ospf_init,
dump: ospf_dump,
start: ospf_start,
shutdown: ospf_shutdown,
reconfigure: ospf_reconfigure,
get_status: ospf_get_status,
get_attr: ospf_get_attr,
get_route_info: ospf_get_route_info
// show_proto_info: ospf_sh
};
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