diff options
Diffstat (limited to 'proto/rip/rip.c')
| -rw-r--r-- | proto/rip/rip.c | 73 |
1 files changed, 59 insertions, 14 deletions
diff --git a/proto/rip/rip.c b/proto/rip/rip.c index 0256528..698f0e2 100644 --- a/proto/rip/rip.c +++ b/proto/rip/rip.c @@ -40,7 +40,6 @@ * we look for any changed routes and broadcast them. */ - #undef LOCAL_DEBUG #include "nest/bird.h" @@ -65,8 +64,10 @@ static struct rip_interface *new_iface(struct proto *p, struct iface *new, unsig #define P_NAME p->name -/* - * Output processing +/** + * DOC: Output processing + * + * This part is responsible for getting packets out to the network. */ static void @@ -77,6 +78,15 @@ rip_tx_err( sock *s, int err ) log( L_ERR "%s: Unexpected error at rip transmit: %M", P_NAME, err ); } +/** + * rip_tx_prepare: + * @e: rip entry that needs to be translated to form suitable for network + * @b: block to be filled + * + * Fill one rip block with info that needs to go to the network. Handle + * nexthop and split horizont correctly. (Next hop is ignored for IPv6, + * that could be fixed but it is not real problem). + */ static int rip_tx_prepare(struct proto *p, ip_addr daddr, struct rip_block *b, struct rip_entry *e, struct rip_interface *rif, int pos ) { @@ -106,6 +116,9 @@ rip_tx_prepare(struct proto *p, ip_addr daddr, struct rip_block *b, struct rip_e return pos+1; } +/** + * rip_tx - send one rip packet to the network + */ static void rip_tx( sock *s ) { @@ -181,6 +194,11 @@ done: return; } +/** + * rip_sendto - send whole routing table to selected destination + * @rif: interface to use. Notice that we lock interface so that at + * most one send to one interface is done. + */ static void rip_sendto( struct proto *p, ip_addr daddr, int dport, struct rip_interface *rif ) { @@ -204,12 +222,6 @@ rip_sendto( struct proto *p, ip_addr daddr, int dport, struct rip_interface *rif c->daddr = daddr; if (c->rif->sock->data != rif) bug("not enough send magic"); -#if 0 - if (sk_open(c->send)<0) { - log( L_ERR "%s Could not open socket for data send to %I:%d on %s", P_NAME, daddr, dport, rif->iface->name ); - return; - } -#endif c->done = 0; FIB_ITERATE_INIT( &c->iter, &P->rtable ); @@ -233,8 +245,10 @@ find_interface(struct proto *p, struct iface *what) return NULL; } -/* - * Input processing +/** + * DOC: Input processing + * + * This part is responsible for any updates that come from network */ static void @@ -247,7 +261,14 @@ rip_rte_update_if_better(rtable *tab, net *net, struct proto *p, rte *new) rte_update(tab, net, p, new); } -/* Let main routing table know about our new entry */ +/** + * advertise_entry - let main routing table know about our new entry + * @b: entry in network format + * + * This basically translates @b to format used by bird core and feeds + * bird core with this route. Notice that we do not store info anywhere + * in our data structures: we'll do that when core notifies us back. + */ static void advertise_entry( struct proto *p, struct rip_block *b, ip_addr whotoldme ) { @@ -312,6 +333,9 @@ advertise_entry( struct proto *p, struct rip_block *b, ip_addr whotoldme ) DBG( "done\n" ); } +/** + * process_block - do some basic check and pass block to advertise_entry + */ static void process_block( struct proto *p, struct rip_block *block, ip_addr whotoldme ) { @@ -335,6 +359,9 @@ process_block( struct proto *p, struct rip_block *block, ip_addr whotoldme ) #define BAD( x ) { log( L_REMOTE "%s: " x, P_NAME ); return 1; } +/** + * rip_process_packet - this is main routine for incoming packets. + */ static int rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr whotoldme, int port ) { @@ -402,6 +429,9 @@ rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr return 0; } +/** + * rip_rx - Receive hook: do basic checks and pass packet to rip_process_packet + */ static int rip_rx(sock *s, int size) { @@ -431,8 +461,8 @@ rip_rx(sock *s, int size) return 1; } -/* - * Interface to rest of bird +/** + * DOC: Interface to bird core */ static void @@ -443,6 +473,9 @@ rip_dump_entry( struct rip_entry *e ) debug( "\n" ); } +/** + * rip_timer - broadcast routing tables periodically (using rip_tx) and kill routes that are too old + */ static void rip_timer(timer *t) { @@ -771,6 +804,10 @@ rip_store_tmp_attrs(struct rte *rt, struct ea_list *attrs) rt->u.rip.metric = ea_get_int(attrs, EA_RIP_METRIC, 1); } +/** + * rip_rt_notify - core tells us about new route (possibly our + * own), so store it into our data structures. + */ static void rip_rt_notify(struct proto *p, struct network *net, struct rte *new, struct rte *old, struct ea_list *attrs) { @@ -839,6 +876,11 @@ rip_rte_better(struct rte *new, struct rte *old) return 0; } +/** + * rip_rte_insert - we maintain linked list of "our" entries in main + * routing table, so that we can timeout them correctly. rip_timer + * walks the list. + */ static void rip_rte_insert(net *net, rte *rte) { @@ -849,6 +891,9 @@ rip_rte_insert(net *net, rte *rte) add_head( &P->garbage, &rte->u.rip.garbage ); } +/** + * rip_rte_remove - link list maintenance + */ static void rip_rte_remove(net *net, rte *rte) { |