Commit 7ab3ff6a authored by Ondřej Filip's avatar Ondřej Filip

Doc in neighbor.c and some tiny changes related to.

parent cadbb827
......@@ -158,14 +158,14 @@ ospf_int_sm(struct ospf_iface *ifa, int event)
case ISM_WAITF:
if(ifa->state==OSPF_IS_WAITING)
{
bdr_election(ifa ,p);
bdr_election(ifa);
}
break;
case ISM_NEICH:
if((ifa->state==OSPF_IS_DROTHER) || (ifa->state==OSPF_IS_DR) ||
(ifa->state==OSPF_IS_BACKUP))
{
bdr_election(ifa ,p);
bdr_election(ifa);
schedule_rt_lsa(ifa->oa);
}
break;
......
/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
* (c) 1999 - 2000 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
......@@ -22,6 +22,15 @@ const char *ospf_inm[]={ "hello received", "neighbor start", "2-way received",
"adjacency ok?", "sequence mismatch", "1-way received", "kill neighbor",
"inactivity timer", "line down" };
/**
* neigh_chstate - handles changes related to new or lod state of neighbor
* @n: OSPF neighbor
* @state: new state
*
* Many actions has to be taken acording to state change of neighbor. It
* starts rxmt timers, call interface state machine etc.
*/
void
neigh_chstate(struct ospf_neighbor *n, u8 state)
{
......@@ -49,14 +58,14 @@ neigh_chstate(struct ospf_neighbor *n, u8 state)
{
ifa->fadj--;
schedule_rt_lsa(ifa->oa);
originate_net_lsa(ifa,po);
originate_net_lsa(ifa);
}
if(state==NEIGHBOR_FULL) /* Increase number of adjacencies */
{
ifa->fadj++;
schedule_rt_lsa(ifa->oa);
originate_net_lsa(ifa,po);
originate_net_lsa(ifa);
}
if(oldstate>=NEIGHBOR_EXSTART && state<NEIGHBOR_EXSTART)
{
......@@ -203,9 +212,20 @@ can_do_adj(struct ospf_neighbor *n)
return i;
}
/**
* ospf_neigh_sm - ospf neighbor state machine
* @n: neighor
* @event: actual event
*
* This part implements neighbor state machine as described in 10.3 of
* RFC 2328. the only difference is that state %NEIGHBOR_ATTEMPT is not
* used. We discover neighbors on nonbroadcast networks using the
* same ways as on broadcast networks. The only difference is in
* sending hello packets. These are send to IPs listed in
* @ospf_iface->nbma_list .
*/
void
ospf_neigh_sm(struct ospf_neighbor *n, int event)
/* Interface state machine */
{
struct proto *p=(struct proto *)(n->ifa->proto);
struct proto_ospf *po=n->ifa->proto;
......@@ -217,7 +237,7 @@ ospf_neigh_sm(struct ospf_neighbor *n, int event)
{
case INM_START:
neigh_chstate(n,NEIGHBOR_ATTEMPT);
/* FIXME No NBMA now */
/* NBMA are used different way */
break;
case INM_HELLOREC:
switch(n->state)
......@@ -298,14 +318,22 @@ ospf_neigh_sm(struct ospf_neighbor *n, int event)
}
}
/**
* bdr_election - (Backup) Designed Router election
* @ifa: actual interface
*
* When wait time fires, it time to elect (Backup) Designed Router.
* Structure describing me is added to this list so every electing router
* has the same list. Backup Designed Router is elected before Designed
* Router. This process is described in 9.4 of RFC 2328.
*/
void
bdr_election(struct ospf_iface *ifa, struct proto *p)
bdr_election(struct ospf_iface *ifa)
{
struct ospf_neighbor *neigh,*ndr,*nbdr,me,*tmp;
u32 myid, ndrid, nbdrid;
int doadj;
p=(struct proto *)(ifa->proto);
struct proto *p=&ifa->proto->proto;
DBG("%s: (B)DR election.\n",p->name);
......@@ -323,7 +351,7 @@ bdr_election(struct ospf_iface *ifa, struct proto *p)
nbdr=electbdr(ifa->neigh_list);
ndr=electdr(ifa->neigh_list);
if(ndr==NULL) ndr=nbdr; /* FIXME is this correct? */
if(ndr==NULL) ndr=nbdr;
if(((ifa->drid==myid) && (ndr!=&me))
|| ((ifa->drid!=myid) && (ndr==&me))
......@@ -511,7 +539,6 @@ ospf_sh_neigh_info(struct ospf_neighbor *n)
if(n->rid==ifa->bdrid) pos="bdr ";
if(n->ifa->type==OSPF_IT_PTP) pos="ptp ";
cli_msg(-1013,"%-18I\t%3u\t%s/%s\t%-5s\t%-18I\t%-10s",n->rid, n->priority,
ospf_ns[n->state], pos, etime, n->ip,ifa->iface->name);
}
/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
* (c) 1999 - 2000 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
......@@ -16,7 +16,7 @@ struct ospf_neighbor *electdr(list nl);
int can_do_adj(struct ospf_neighbor *n);
void tryadj(struct ospf_neighbor *n, struct proto *p);
void ospf_neigh_sm(struct ospf_neighbor *n, int event);
void bdr_election(struct ospf_iface *ifa, struct proto *p);
void bdr_election(struct ospf_iface *ifa);
struct ospf_neighbor *find_neigh(struct ospf_iface *ifa, u32 rid);
struct ospf_neighbor *find_neigh_noifa(struct proto_ospf *po, u32 rid);
struct ospf_area *ospf_find_area(struct proto_ospf *po, u32 aid);
......
/*
* BIRD -- OSPF
*
* (c) 1999-2000 Ondrej Filip <feela@network.cz>
* (c) 1999 - 2000 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
......
/*
* BIRD -- OSPF
*
* (c) 1999-2000 Ondrej Filip <feela@network.cz>
* (c) 1999 - 2000 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
......
......@@ -169,6 +169,15 @@ addifa_rtlsa(struct ospf_iface *ifa)
else ifa->oa=oa;
}
/**
* originate_rt_lsa - build new instance of router LSA
* @oa: ospf_area which is LSA built to
*
* It builds router LSA walking through all OSPF interfaces in
* specified OSPF area. This function is mostly called from
* area_disp(). Builds new LSA, increases sequence number (if old
* instance exists) and sets age of LSA to zero.
*/
void
originate_rt_lsa(struct ospf_area *oa)
{
......@@ -231,9 +240,19 @@ originate_net_lsa_body(struct ospf_iface *ifa, u16 *length,
return net;
}
/**
* originate_net_lsa - originates of deletes network LSA
* @ifa: interface which is LSA originated for
*
* Interface counts number of adjacent neighbor. If this number is
* lower then one or interface is not in state %OSPF_IS_DR it deletes
* and premature ages instance of network LSA for specified interface.
* In other case, new instance of network LSA is originated.
*/
void
originate_net_lsa(struct ospf_iface *ifa, struct proto_ospf *po)
originate_net_lsa(struct ospf_iface *ifa)
{
struct proto_ospf *po=ifa->proto;
struct ospf_lsa_header lsa;
u32 rtid=po->proto.cf->global->router_id;
struct top_hash_entry *en;
......@@ -247,6 +266,8 @@ originate_net_lsa(struct ospf_iface *ifa, struct proto_ospf *po)
{
if(ifa->nlsa==NULL) return;
OSPF_TRACE(D_EVENTS, "Deleting Net lsa for iface \"%s\".",
ifa->iface->name);
ifa->nlsa->lsa.sn+=1;
ifa->nlsa->lsa.age=LSA_MAXAGE;
flood_lsa(NULL,NULL,&ifa->nlsa->lsa,po,NULL,ifa->oa,0);
......@@ -257,6 +278,9 @@ originate_net_lsa(struct ospf_iface *ifa, struct proto_ospf *po)
return ;
}
OSPF_TRACE(D_EVENTS, "Originating Net lsa for iface \"%s\".",
ifa->iface->name);
lsa.age=0;
lsa.id=ipa_to_u32(ifa->iface->addr->ip);
lsa.type=LSA_T_NET;
......@@ -317,6 +341,18 @@ originate_ext_lsa_body(net *n, rte *e, struct proto_ospf *po, struct ea_list *at
return ext;
}
/**
* originate_ext_lsa - new route recived from nest and filters
* @n: network prefix and mask
* @e: rte
* @po: current instance of OSPF
* @attrs: list of extended attributes
*
* If I receive message that new route is installed, I try to originate an
* external LSA. LSA header of such LSA does not contain information about
* prefix lenght, so if I have to originate multiple LSAs for route with
* different prefixes I try to increment prefix id to find a "free" one.
*/
void
originate_ext_lsa(net *n, rte *e, struct proto_ospf *po, struct ea_list *attrs)
{
......@@ -417,6 +453,13 @@ return (ospf_top_hash_u32(lsaid) + ospf_top_hash_u32((type==LSA_T_NET) ? lsaid :
#endif
}
/**
* ospf_top_new - allocated new topology database
* @p: current instance of OSPF
*
* This dynamically hashed structure is often used for keeping LSAs. Mainly
* its used in @ospf_area structute.
*/
struct top_graph *
ospf_top_new(struct proto_ospf *p)
{
......
......@@ -47,7 +47,7 @@ struct top_hash_entry *ospf_hash_get(struct top_graph *, u32 lsa, u32 rtr, u32 t
void ospf_hash_delete(struct top_graph *, struct top_hash_entry *);
void addifa_rtlsa(struct ospf_iface *ifa);
void originate_rt_lsa(struct ospf_area *oa);
void originate_net_lsa(struct ospf_iface *ifa,struct proto_ospf *po);
void originate_net_lsa(struct ospf_iface *ifa);
int can_flush_lsa(struct ospf_area *oa);
void originate_ext_lsa(net *n, rte *e, struct proto_ospf *po, struct ea_list *attrs);
......
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