1052 lines
25 KiB
C
1052 lines
25 KiB
C
/*
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* ntp_peer.c - management of data maintained for peer associations
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#include "ntpd.h"
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#include "ntp_stdlib.h"
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#include <ntp_random.h>
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#ifdef OPENSSL
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#include "openssl/rand.h"
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#endif /* OPENSSL */
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#ifdef SYS_WINNT
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extern int accept_wildcard_if_for_winnt;
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#endif
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/*
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* Table of valid association combinations
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* ---------------------------------------
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*
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* packet->mode
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* peer->mode | UNSPEC ACTIVE PASSIVE CLIENT SERVER BCAST
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* ---------- | ---------------------------------------------
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* NO_PEER | e 1 0 1 1 1
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* ACTIVE | e 1 1 0 0 0
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* PASSIVE | e 1 e 0 0 0
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* CLIENT | e 0 0 0 1 1
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* SERVER | e 0 0 0 0 0
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* BCAST | e 0 0 0 0 0
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* BCLIENT | e 0 0 0 e 1
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*
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* One point to note here: a packet in BCAST mode can potentially match
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* a peer in CLIENT mode, but we that is a special case and we check for
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* that early in the decision process. This avoids having to keep track
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* of what kind of associations are possible etc... We actually
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* circumvent that problem by requiring that the first b(m)roadcast
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* received after the change back to BCLIENT mode sets the clock.
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*/
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#define AM_MODES 7 /* number of rows and columns */
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#define NO_PEER 0 /* action when no peer is found */
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int AM[AM_MODES][AM_MODES] = {
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/* { UNSPEC, ACTIVE, PASSIVE, CLIENT, SERVER, BCAST } */
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/*NONE*/{ AM_ERR, AM_NEWPASS, AM_NOMATCH, AM_FXMIT, AM_MANYCAST, AM_NEWBCL},
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/*A*/ { AM_ERR, AM_PROCPKT, AM_PROCPKT, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH},
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/*P*/ { AM_ERR, AM_PROCPKT, AM_ERR, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH},
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/*C*/ { AM_ERR, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH, AM_PROCPKT, AM_POSSBCL},
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/*S*/ { AM_ERR, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH},
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/*BCST*/{ AM_ERR, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH},
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/*BCL*/ { AM_ERR, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH, AM_NOMATCH, AM_PROCPKT},
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};
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#define MATCH_ASSOC(x,y) AM[(x)][(y)]
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/*
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* These routines manage the allocation of memory to peer structures
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* and the maintenance of the peer hash table. The two main entry
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* points are findpeer(), which looks for matching peer sturctures in
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* the peer list, newpeer(), which allocates a new peer structure and
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* adds it to the list, and unpeer(), which demobilizes the association
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* and deallocates the structure.
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*/
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/*
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* Peer hash tables
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*/
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struct peer *peer_hash[NTP_HASH_SIZE]; /* peer hash table */
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int peer_hash_count[NTP_HASH_SIZE]; /* peers in each bucket */
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struct peer *assoc_hash[NTP_HASH_SIZE]; /* association ID hash table */
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int assoc_hash_count[NTP_HASH_SIZE]; /* peers in each bucket */
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static struct peer *peer_free; /* peer structures free list */
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int peer_free_count; /* count of free structures */
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/*
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* Association ID. We initialize this value randomly, then assign a new
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* value every time the peer structure is incremented.
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*/
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static associd_t current_association_ID; /* association ID */
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/*
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* Memory allocation watermarks.
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*/
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#define INIT_PEER_ALLOC 15 /* initialize for 15 peers */
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#define INC_PEER_ALLOC 5 /* when run out, add 5 more */
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/*
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* Miscellaneous statistic counters which may be queried.
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*/
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u_long peer_timereset; /* time stat counters zeroed */
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u_long findpeer_calls; /* calls to findpeer */
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u_long assocpeer_calls; /* calls to findpeerbyassoc */
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u_long peer_allocations; /* allocations from free list */
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u_long peer_demobilizations; /* structs freed to free list */
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int total_peer_structs; /* peer structs */
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int peer_associations; /* mobilized associations */
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int peer_preempt; /* preemptable associations */
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static struct peer init_peer_alloc[INIT_PEER_ALLOC]; /* init alloc */
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static void getmorepeermem P((void));
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static struct interface *select_peerinterface P((struct peer *, struct sockaddr_storage *, struct interface *, u_char));
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/*
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* init_peer - initialize peer data structures and counters
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*
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* N.B. We use the random number routine in here. It had better be
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* initialized prior to getting here.
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*/
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void
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init_peer(void)
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{
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register int i;
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/*
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* Clear hash table and counters.
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*/
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for (i = 0; i < NTP_HASH_SIZE; i++) {
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peer_hash[i] = 0;
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peer_hash_count[i] = 0;
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assoc_hash[i] = 0;
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assoc_hash_count[i] = 0;
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}
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/*
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* Clear stat counters
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*/
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findpeer_calls = peer_allocations = 0;
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assocpeer_calls = peer_demobilizations = 0;
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/*
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* Initialize peer memory.
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*/
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peer_free = 0;
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for (i = 0; i < INIT_PEER_ALLOC; i++) {
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init_peer_alloc[i].next = peer_free;
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peer_free = &init_peer_alloc[i];
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}
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total_peer_structs = INIT_PEER_ALLOC;
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peer_free_count = INIT_PEER_ALLOC;
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/*
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* Initialize our first association ID
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*/
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while ((current_association_ID = ntp_random() & 0xffff) == 0);
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}
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/*
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* getmorepeermem - add more peer structures to the free list
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*/
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static void
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getmorepeermem(void)
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{
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register int i;
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register struct peer *peer;
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peer = (struct peer *)emalloc(INC_PEER_ALLOC *
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sizeof(struct peer));
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for (i = 0; i < INC_PEER_ALLOC; i++) {
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peer->next = peer_free;
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peer_free = peer;
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peer++;
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}
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total_peer_structs += INC_PEER_ALLOC;
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peer_free_count += INC_PEER_ALLOC;
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}
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/*
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* findexistingpeer - return a pointer to a peer in the hash table
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*/
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struct peer *
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findexistingpeer(
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struct sockaddr_storage *addr,
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struct peer *start_peer,
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int mode
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)
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{
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register struct peer *peer;
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/*
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* start_peer is included so we can locate instances of the
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* same peer through different interfaces in the hash table.
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*/
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if (start_peer == 0)
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peer = peer_hash[NTP_HASH_ADDR(addr)];
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else
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peer = start_peer->next;
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while (peer != 0) {
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if (SOCKCMP(addr, &peer->srcadr)
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&& NSRCPORT(addr) == NSRCPORT(&peer->srcadr)) {
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if (mode == -1)
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return (peer);
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else if (peer->hmode == mode)
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break;
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}
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peer = peer->next;
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}
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return (peer);
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}
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/*
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* findpeer - find and return a peer in the hash table.
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*/
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struct peer *
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findpeer(
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struct sockaddr_storage *srcadr,
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struct interface *dstadr,
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int pkt_mode,
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int *action
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)
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{
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register struct peer *peer;
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int hash;
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findpeer_calls++;
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hash = NTP_HASH_ADDR(srcadr);
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for (peer = peer_hash[hash]; peer != NULL; peer = peer->next) {
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if (SOCKCMP(srcadr, &peer->srcadr) &&
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NSRCPORT(srcadr) == NSRCPORT(&peer->srcadr)) {
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/*
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* if the association matching rules determine
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* that this is not a valid combination, then
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* look for the next valid peer association.
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*/
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*action = MATCH_ASSOC(peer->hmode, pkt_mode);
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/*
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* if an error was returned, exit back right
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* here.
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*/
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if (*action == AM_ERR)
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return ((struct peer *)0);
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/*
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* if a match is found, we stop our search.
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*/
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if (*action != AM_NOMATCH)
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break;
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}
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}
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/*
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* If no matching association is found
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*/
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if (peer == 0) {
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*action = MATCH_ASSOC(NO_PEER, pkt_mode);
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return ((struct peer *)0);
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}
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set_peerdstadr(peer, dstadr);
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return (peer);
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}
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/*
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* findpeerbyassocid - find and return a peer using his association ID
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*/
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struct peer *
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findpeerbyassoc(
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u_int assoc
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)
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{
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register struct peer *peer;
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int hash;
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assocpeer_calls++;
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hash = assoc & NTP_HASH_MASK;
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for (peer = assoc_hash[hash]; peer != 0; peer =
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peer->ass_next) {
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if (assoc == peer->associd)
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return (peer);
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}
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return (NULL);
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}
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/*
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* clear_all - flush all time values for all associations
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*/
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void
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clear_all(void)
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{
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struct peer *peer, *next_peer;
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int n;
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/*
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* This routine is called when the clock is stepped, and so all
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* previously saved time values are untrusted.
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*/
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for (n = 0; n < NTP_HASH_SIZE; n++) {
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for (peer = peer_hash[n]; peer != 0; peer = next_peer) {
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next_peer = peer->next;
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if (!(peer->cast_flags & (MDF_ACAST | MDF_MCAST |
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MDF_BCAST))) {
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peer->hpoll = peer->minpoll;
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peer_clear(peer, "STEP");
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}
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}
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}
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#ifdef DEBUG
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if (debug)
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printf("clear_all: at %lu\n", current_time);
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#endif
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}
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/*
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* unpeer - remove peer structure from hash table and free structure
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*/
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void
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unpeer(
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struct peer *peer_to_remove
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)
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{
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int hash;
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#ifdef OPENSSL
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char statstr[NTP_MAXSTRLEN]; /* statistics for filegen */
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if (peer_to_remove->flags & FLAG_SKEY) {
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sprintf(statstr, "unpeer %d flash %x reach %03o flags %04x",
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peer_to_remove->associd, peer_to_remove->flash,
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peer_to_remove->reach, peer_to_remove->flags);
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record_crypto_stats(&peer_to_remove->srcadr, statstr);
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#ifdef DEBUG
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if (debug)
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printf("peer: %s\n", statstr);
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#endif
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}
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#endif /* OPENSSL */
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#ifdef DEBUG
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if (debug)
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printf("demobilize %u %d %d\n", peer_to_remove->associd,
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peer_associations, peer_preempt);
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#endif
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set_peerdstadr(peer_to_remove, NULL);
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/* XXXMEMLEAK? peer_clear->crypto allocation */
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hash = NTP_HASH_ADDR(&peer_to_remove->srcadr);
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peer_hash_count[hash]--;
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peer_demobilizations++;
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peer_associations--;
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if (peer_to_remove->flags & FLAG_PREEMPT)
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peer_preempt--;
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#ifdef REFCLOCK
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/*
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* If this peer is actually a clock, shut it down first
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*/
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if (peer_to_remove->flags & FLAG_REFCLOCK)
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refclock_unpeer(peer_to_remove);
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#endif
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peer_to_remove->action = 0; /* disable timeout actions */
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if (peer_hash[hash] == peer_to_remove)
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peer_hash[hash] = peer_to_remove->next;
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else {
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register struct peer *peer;
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peer = peer_hash[hash];
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while (peer != 0 && peer->next != peer_to_remove)
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peer = peer->next;
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if (peer == 0) {
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peer_hash_count[hash]++;
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msyslog(LOG_ERR, "peer struct for %s not in table!",
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stoa(&peer->srcadr));
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} else {
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peer->next = peer_to_remove->next;
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}
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}
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/*
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* Remove him from the association hash as well.
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*/
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hash = peer_to_remove->associd & NTP_HASH_MASK;
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assoc_hash_count[hash]--;
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if (assoc_hash[hash] == peer_to_remove)
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assoc_hash[hash] = peer_to_remove->ass_next;
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else {
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register struct peer *peer;
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peer = assoc_hash[hash];
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while (peer != 0 && peer->ass_next != peer_to_remove)
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peer = peer->ass_next;
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if (peer == 0) {
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assoc_hash_count[hash]++;
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msyslog(LOG_ERR,
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"peer struct for %s not in association table!",
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stoa(&peer->srcadr));
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} else {
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peer->ass_next = peer_to_remove->ass_next;
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}
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}
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peer_to_remove->next = peer_free;
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peer_free = peer_to_remove;
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peer_free_count++;
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}
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/*
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* peer_config - configure a new association
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*/
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struct peer *
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peer_config(
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struct sockaddr_storage *srcadr,
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struct interface *dstadr,
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int hmode,
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int version,
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int minpoll,
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int maxpoll,
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u_int flags,
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int ttl,
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keyid_t key,
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u_char *keystr
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)
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{
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register struct peer *peer;
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u_char cast_flags;
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/*
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* First search from the beginning for an association with given
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* remote address and mode. If an interface is given, search
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* from there to find the association which matches that
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* destination. If the given interface is "any", track down
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* the actual interface, because that's what gets put into the
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* peer structure.
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*/
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peer = findexistingpeer(srcadr, (struct peer *)0, hmode);
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if (dstadr != 0) {
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while (peer != 0) {
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if (peer->dstadr == dstadr)
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break;
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if (dstadr == ANY_INTERFACE_CHOOSE(srcadr) &&
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peer->dstadr == findinterface(srcadr))
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break;
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peer = findexistingpeer(srcadr, peer, hmode);
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}
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}
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/*
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* We do a dirty little jig to figure the cast flags. This is
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* probably not the best place to do this, at least until the
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* configure code is rebuilt. Note only one flag can be set.
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*/
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switch (hmode) {
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case MODE_BROADCAST:
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if(srcadr->ss_family == AF_INET) {
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if (IN_CLASSD(ntohl(((struct sockaddr_in*)srcadr)->sin_addr.s_addr)))
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cast_flags = MDF_MCAST;
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else
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cast_flags = MDF_BCAST;
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break;
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}
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else {
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if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6*)srcadr)->sin6_addr))
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cast_flags = MDF_MCAST;
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else
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cast_flags = MDF_BCAST;
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break;
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}
|
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case MODE_CLIENT:
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if(srcadr->ss_family == AF_INET) {
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if (IN_CLASSD(ntohl(((struct sockaddr_in*)srcadr)->sin_addr.s_addr)))
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cast_flags = MDF_ACAST;
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else
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cast_flags = MDF_UCAST;
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break;
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}
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else {
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if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6*)srcadr)->sin6_addr))
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cast_flags = MDF_ACAST;
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else
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cast_flags = MDF_UCAST;
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break;
|
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}
|
|
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default:
|
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cast_flags = MDF_UCAST;
|
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}
|
|
|
|
/*
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* If the peer is already configured, some dope has a duplicate
|
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* configureation entry or another dope is wiggling from afar.
|
|
*/
|
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if (peer != 0) {
|
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peer->hmode = (u_char)hmode;
|
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peer->version = (u_char) version;
|
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peer->minpoll = (u_char) minpoll;
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peer->maxpoll = (u_char) maxpoll;
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peer->flags = flags | FLAG_CONFIG |
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(peer->flags & FLAG_REFCLOCK);
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peer->cast_flags = cast_flags;
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peer->ttl = (u_char) ttl;
|
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peer->keyid = key;
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peer->precision = sys_precision;
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peer_clear(peer, "RMOT");
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return (peer);
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}
|
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|
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/*
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|
* Here no match has been found, so presumably this is a new
|
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* persistent association. Mobilize the thing and initialize its
|
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* variables. If emulating ntpdate, force iburst.
|
|
*/
|
|
if (mode_ntpdate)
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flags |= FLAG_IBURST;
|
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peer = newpeer(srcadr, dstadr, hmode, version, minpoll, maxpoll,
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flags | FLAG_CONFIG, cast_flags, ttl, key);
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return (peer);
|
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}
|
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|
|
/*
|
|
* setup peer dstadr field keeping it in sync with the interface structures
|
|
*/
|
|
void
|
|
set_peerdstadr(struct peer *peer, struct interface *interface)
|
|
{
|
|
if (peer->dstadr != interface) {
|
|
if (interface != NULL &&
|
|
(peer->cast_flags & MDF_BCLNT) &&
|
|
(interface->flags & INT_MCASTIF) &&
|
|
peer->burst) {
|
|
/*
|
|
* don't accept updates to a true multicast reception
|
|
* interface while a BCLNT peer is running it's
|
|
* unicast protocol
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if (peer->dstadr != NULL)
|
|
{
|
|
peer->dstadr->peercnt--;
|
|
ISC_LIST_UNLINK_TYPE(peer->dstadr->peers, peer, ilink, struct peer);
|
|
}
|
|
|
|
DPRINTF(4, ("set_peerdstadr(%s): change interface from %s to %s\n",
|
|
stoa(&peer->srcadr),
|
|
(peer->dstadr != NULL) ? stoa(&peer->dstadr->sin) : "<null>",
|
|
(interface != NULL) ? stoa(&interface->sin) : "<null>"));
|
|
|
|
peer->dstadr = interface;
|
|
|
|
if (peer->dstadr != NULL)
|
|
{
|
|
ISC_LIST_APPEND(peer->dstadr->peers, peer, ilink);
|
|
peer->dstadr->peercnt++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* attempt to re-rebind interface if necessary
|
|
*/
|
|
static void
|
|
peer_refresh_interface(struct peer *peer)
|
|
{
|
|
struct interface *niface, *piface;
|
|
|
|
niface = select_peerinterface(peer, &peer->srcadr, NULL, peer->cast_flags);
|
|
|
|
#ifdef DEBUG
|
|
if (debug > 3)
|
|
{
|
|
printf(
|
|
"peer_refresh_interface: %s->%s mode %d vers %d poll %d %d flags 0x%x 0x%x ttl %d key %08x: new interface: ",
|
|
peer->dstadr == NULL ? "<null>" : stoa(&peer->dstadr->sin),
|
|
stoa(&peer->srcadr),
|
|
peer->hmode, peer->version, peer->minpoll,
|
|
peer->maxpoll, peer->flags, peer->cast_flags,
|
|
peer->ttl, peer->keyid);
|
|
if (niface != NULL)
|
|
{
|
|
printf("fd=%d, bfd=%d, name=%.16s, flags=0x%x, scope=%d, ",
|
|
niface->fd,
|
|
niface->bfd,
|
|
niface->name,
|
|
niface->flags,
|
|
niface->scopeid);
|
|
/* Leave these as three printf calls. */
|
|
printf(", sin=%s",
|
|
stoa((&niface->sin)));
|
|
if (niface->flags & INT_BROADCAST)
|
|
printf(", bcast=%s,",
|
|
stoa((&niface->bcast)));
|
|
printf(", mask=%s\n",
|
|
stoa((&niface->mask)));
|
|
}
|
|
else
|
|
{
|
|
printf("<NONE>\n");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
piface = peer->dstadr;
|
|
|
|
set_peerdstadr(peer, niface);
|
|
|
|
if (peer->dstadr) {
|
|
/*
|
|
* clear crypto if we change the local address
|
|
*/
|
|
if (peer->dstadr != piface && !(peer->cast_flags & MDF_BCLNT)) {
|
|
peer_crypto_clear(peer);
|
|
}
|
|
|
|
/*
|
|
* Broadcast needs the socket enabled for broadcast
|
|
*/
|
|
if (peer->cast_flags & MDF_BCAST) {
|
|
enable_broadcast(peer->dstadr, &peer->srcadr);
|
|
}
|
|
|
|
/*
|
|
* Multicast needs the socket interface enabled for multicast
|
|
*/
|
|
if (peer->cast_flags & MDF_MCAST) {
|
|
enable_multicast_if(peer->dstadr, &peer->srcadr);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* refresh_all_peerinterfaces - see that all interface bindings are up to date
|
|
*/
|
|
void
|
|
refresh_all_peerinterfaces(void)
|
|
{
|
|
struct peer *peer, *next_peer;
|
|
int n;
|
|
|
|
/*
|
|
* this is called when the interface list has changed
|
|
* give all peers a chance to find a better interface
|
|
*/
|
|
for (n = 0; n < NTP_HASH_SIZE; n++) {
|
|
for (peer = peer_hash[n]; peer != 0; peer = next_peer) {
|
|
next_peer = peer->next;
|
|
peer_refresh_interface(peer);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* find an interface suitable for the src address
|
|
*/
|
|
static struct interface *
|
|
select_peerinterface(struct peer *peer, struct sockaddr_storage *srcadr, struct interface *dstadr, u_char cast_flags)
|
|
{
|
|
struct interface *interface;
|
|
|
|
/*
|
|
* Initialize the peer structure and dance the interface jig.
|
|
* Reference clocks step the loopback waltz, the others
|
|
* squaredance around the interface list looking for a buddy. If
|
|
* the dance peters out, there is always the wildcard interface.
|
|
* This might happen in some systems and would preclude proper
|
|
* operation with public key cryptography.
|
|
*/
|
|
if (ISREFCLOCKADR(srcadr))
|
|
interface = loopback_interface;
|
|
else
|
|
if (cast_flags & (MDF_BCLNT | MDF_ACAST | MDF_MCAST | MDF_BCAST)) {
|
|
interface = findbcastinter(srcadr);
|
|
#ifdef DEBUG
|
|
if (debug > 3) {
|
|
if (interface != NULL)
|
|
printf("Found *-cast interface address %s, for address %s\n",
|
|
stoa(&(interface)->sin), stoa(srcadr));
|
|
else
|
|
printf("No *-cast local address found for address %s\n",
|
|
stoa(srcadr));
|
|
}
|
|
#endif
|
|
/*
|
|
* If it was a multicast packet, findbcastinter() may not
|
|
* find it, so try a little harder.
|
|
*/
|
|
if (interface == ANY_INTERFACE_CHOOSE(srcadr))
|
|
interface = findinterface(srcadr);
|
|
}
|
|
else if (dstadr != NULL && dstadr != ANY_INTERFACE_CHOOSE(srcadr))
|
|
interface = dstadr;
|
|
else
|
|
interface = findinterface(srcadr);
|
|
|
|
/*
|
|
* we do not bind to the wildcard interfaces for output
|
|
* as our (network) source address would be undefined and
|
|
* crypto will not work without knowing the own transmit address
|
|
*/
|
|
if (interface != NULL && interface->flags & INT_WILDCARD)
|
|
#ifdef SYS_WINNT
|
|
if ( !accept_wildcard_if_for_winnt )
|
|
#endif
|
|
interface = NULL;
|
|
|
|
|
|
return interface;
|
|
}
|
|
|
|
/*
|
|
* newpeer - initialize a new peer association
|
|
*/
|
|
struct peer *
|
|
newpeer(
|
|
struct sockaddr_storage *srcadr,
|
|
struct interface *dstadr,
|
|
int hmode,
|
|
int version,
|
|
int minpoll,
|
|
int maxpoll,
|
|
u_int flags,
|
|
u_char cast_flags,
|
|
int ttl,
|
|
keyid_t key
|
|
)
|
|
{
|
|
register struct peer *peer;
|
|
register int i;
|
|
#ifdef OPENSSL
|
|
char statstr[NTP_MAXSTRLEN]; /* statistics for filegen */
|
|
#endif /* OPENSSL */
|
|
|
|
/*
|
|
* Allocate a new peer structure. Some dirt here, since some of
|
|
* the initialization requires knowlege of our system state.
|
|
*/
|
|
if (peer_free_count == 0)
|
|
getmorepeermem();
|
|
peer = peer_free;
|
|
peer_free = peer->next;
|
|
peer_free_count--;
|
|
peer_associations++;
|
|
if (flags & FLAG_PREEMPT)
|
|
peer_preempt++;
|
|
memset((char *)peer, 0, sizeof(struct peer));
|
|
|
|
/*
|
|
* Assign an association ID and increment the system variable.
|
|
*/
|
|
peer->associd = current_association_ID;
|
|
if (++current_association_ID == 0)
|
|
++current_association_ID;
|
|
|
|
DPRINTF(3, ("newpeer: cast flags: 0x%x for address: %s\n",
|
|
cast_flags, stoa(srcadr)));
|
|
|
|
ISC_LINK_INIT(peer, ilink); /* set up interface link chain */
|
|
peer->srcadr = *srcadr;
|
|
set_peerdstadr(peer, select_peerinterface(peer, srcadr, dstadr,
|
|
cast_flags));
|
|
peer->hmode = (u_char)hmode;
|
|
peer->version = (u_char)version;
|
|
peer->minpoll = (u_char)max(NTP_MINPOLL, minpoll);
|
|
peer->maxpoll = (u_char)min(NTP_MAXPOLL, maxpoll);
|
|
peer->flags = flags;
|
|
#ifdef DEBUG
|
|
if (debug > 2) {
|
|
if (peer->dstadr)
|
|
printf("newpeer: using fd %d and our addr %s\n",
|
|
peer->dstadr->fd,
|
|
stoa(&peer->dstadr->sin));
|
|
else
|
|
printf("newpeer: local interface currently not bound\n");
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Broadcast needs the socket enabled for broadcast
|
|
*/
|
|
if (cast_flags & MDF_BCAST && peer->dstadr) {
|
|
enable_broadcast(peer->dstadr, srcadr);
|
|
}
|
|
/*
|
|
* Multicast needs the socket interface enabled for multicast
|
|
*/
|
|
if (cast_flags & MDF_MCAST && peer->dstadr) {
|
|
enable_multicast_if(peer->dstadr, srcadr);
|
|
}
|
|
if (key != 0)
|
|
peer->flags |= FLAG_AUTHENABLE;
|
|
if (key > NTP_MAXKEY)
|
|
peer->flags |= FLAG_SKEY;
|
|
peer->cast_flags = cast_flags;
|
|
peer->ttl = (u_char)ttl;
|
|
peer->keyid = key;
|
|
peer->precision = sys_precision;
|
|
peer->hpoll = peer->minpoll;
|
|
if (cast_flags & MDF_ACAST)
|
|
peer_clear(peer, "ACST");
|
|
else if (cast_flags & MDF_MCAST)
|
|
peer_clear(peer, "MCST");
|
|
else if (cast_flags & MDF_BCAST)
|
|
peer_clear(peer, "BCST");
|
|
else
|
|
peer_clear(peer, "INIT");
|
|
if (mode_ntpdate)
|
|
peer_ntpdate++;
|
|
|
|
/*
|
|
* Note time on statistics timers.
|
|
*/
|
|
peer->timereset = current_time;
|
|
peer->timereachable = current_time;
|
|
peer->timereceived = current_time;
|
|
|
|
#ifdef REFCLOCK
|
|
if (ISREFCLOCKADR(&peer->srcadr)) {
|
|
|
|
/*
|
|
* We let the reference clock support do clock
|
|
* dependent initialization. This includes setting
|
|
* the peer timer, since the clock may have requirements
|
|
* for this.
|
|
*/
|
|
if (!refclock_newpeer(peer)) {
|
|
/*
|
|
* Dump it, something screwed up
|
|
*/
|
|
set_peerdstadr(peer, NULL);
|
|
|
|
peer->next = peer_free;
|
|
peer_free = peer;
|
|
peer_free_count++;
|
|
return (NULL);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Put the new peer in the hash tables.
|
|
*/
|
|
i = NTP_HASH_ADDR(&peer->srcadr);
|
|
peer->next = peer_hash[i];
|
|
peer_hash[i] = peer;
|
|
peer_hash_count[i]++;
|
|
i = peer->associd & NTP_HASH_MASK;
|
|
peer->ass_next = assoc_hash[i];
|
|
assoc_hash[i] = peer;
|
|
assoc_hash_count[i]++;
|
|
|
|
#ifdef OPENSSL
|
|
if (peer->flags & FLAG_SKEY) {
|
|
sprintf(statstr, "newpeer %d", peer->associd);
|
|
record_crypto_stats(&peer->srcadr, statstr);
|
|
DPRINTF(1, ("peer: %s\n", statstr));
|
|
}
|
|
#endif /* OPENSSL */
|
|
|
|
DPRINTF(1, ("newpeer: %s->%s mode %d vers %d poll %d %d flags 0x%x 0x%x ttl %d key %08x\n",
|
|
peer->dstadr == NULL ? "<null>" : stoa(&peer->dstadr->sin),
|
|
stoa(&peer->srcadr),
|
|
peer->hmode, peer->version, peer->minpoll,
|
|
peer->maxpoll, peer->flags, peer->cast_flags,
|
|
peer->ttl, peer->keyid));
|
|
|
|
return (peer);
|
|
}
|
|
|
|
|
|
/*
|
|
* peer_unconfig - remove the configuration bit from a peer
|
|
*/
|
|
int
|
|
peer_unconfig(
|
|
struct sockaddr_storage *srcadr,
|
|
struct interface *dstadr,
|
|
int mode
|
|
)
|
|
{
|
|
register struct peer *peer;
|
|
int num_found;
|
|
|
|
num_found = 0;
|
|
peer = findexistingpeer(srcadr, (struct peer *)0, mode);
|
|
while (peer != 0) {
|
|
if (peer->flags & FLAG_CONFIG
|
|
&& (dstadr == 0 || peer->dstadr == dstadr)) {
|
|
num_found++;
|
|
|
|
/*
|
|
* Tricky stuff here. If the peer is polling us
|
|
* in active mode, turn off the configuration
|
|
* bit and make the mode passive. This allows us
|
|
* to avoid dumping a lot of history for peers
|
|
* we might choose to keep track of in passive
|
|
* mode. The protocol will eventually terminate
|
|
* undesirables on its own.
|
|
*/
|
|
if (peer->hmode == MODE_ACTIVE
|
|
&& peer->pmode == MODE_ACTIVE) {
|
|
peer->hmode = MODE_PASSIVE;
|
|
peer->flags &= ~FLAG_CONFIG;
|
|
} else {
|
|
unpeer(peer);
|
|
peer = 0;
|
|
}
|
|
}
|
|
peer = findexistingpeer(srcadr, peer, mode);
|
|
}
|
|
return (num_found);
|
|
}
|
|
|
|
/*
|
|
* peer_clr_stats - clear peer module stat counters
|
|
*/
|
|
void
|
|
peer_clr_stats(void)
|
|
{
|
|
findpeer_calls = 0;
|
|
assocpeer_calls = 0;
|
|
peer_allocations = 0;
|
|
peer_demobilizations = 0;
|
|
peer_timereset = current_time;
|
|
}
|
|
|
|
/*
|
|
* peer_reset - reset stat counters in a peer structure
|
|
*/
|
|
void
|
|
peer_reset(
|
|
struct peer *peer
|
|
)
|
|
{
|
|
if (peer == 0)
|
|
return;
|
|
peer->sent = 0;
|
|
peer->received = 0;
|
|
peer->processed = 0;
|
|
peer->badauth = 0;
|
|
peer->bogusorg = 0;
|
|
peer->oldpkt = 0;
|
|
peer->seldisptoolarge = 0;
|
|
peer->timereset = current_time;
|
|
}
|
|
|
|
|
|
/*
|
|
* peer_all_reset - reset all peer stat counters
|
|
*/
|
|
void
|
|
peer_all_reset(void)
|
|
{
|
|
struct peer *peer;
|
|
int hash;
|
|
|
|
for (hash = 0; hash < NTP_HASH_SIZE; hash++)
|
|
for (peer = peer_hash[hash]; peer != 0; peer = peer->next)
|
|
peer_reset(peer);
|
|
}
|
|
|
|
|
|
#ifdef OPENSSL
|
|
/*
|
|
* expire_all - flush all crypto data and update timestamps.
|
|
*/
|
|
void
|
|
expire_all(void)
|
|
{
|
|
struct peer *peer, *next_peer;
|
|
int n;
|
|
|
|
/*
|
|
* This routine is called about once per day from the timer
|
|
* routine and when the client is first synchronized. Search the
|
|
* peer list for all associations and flush only the key list
|
|
* and cookie. If a manycast client association, flush
|
|
* everything. Then, recompute and sign the agreement public
|
|
* value, if present.
|
|
*/
|
|
if (!crypto_flags)
|
|
return;
|
|
|
|
for (n = 0; n < NTP_HASH_SIZE; n++) {
|
|
for (peer = peer_hash[n]; peer != 0; peer = next_peer) {
|
|
next_peer = peer->next;
|
|
if (!(peer->flags & FLAG_SKEY)) {
|
|
continue;
|
|
|
|
} else if (peer->hmode == MODE_ACTIVE ||
|
|
peer->hmode == MODE_PASSIVE) {
|
|
key_expire(peer);
|
|
peer->crypto &= ~(CRYPTO_FLAG_AUTO |
|
|
CRYPTO_FLAG_AGREE);
|
|
}
|
|
|
|
}
|
|
}
|
|
RAND_bytes((u_char *)&sys_private, 4);
|
|
crypto_update();
|
|
}
|
|
#endif /* OPENSSL */
|
|
|
|
|
|
/*
|
|
* findmanycastpeer - find and return a manycast peer
|
|
*/
|
|
struct peer *
|
|
findmanycastpeer(
|
|
struct recvbuf *rbufp
|
|
)
|
|
{
|
|
register struct peer *peer;
|
|
struct pkt *pkt;
|
|
l_fp p_org;
|
|
int i;
|
|
|
|
/*
|
|
* This routine is called upon arrival of a server-mode message
|
|
* from a manycast client. Search the peer list for a manycast
|
|
* client association where the last transmit timestamp matches
|
|
* the originate timestamp. This assumes the transmit timestamps
|
|
* for possibly more than one manycast association are unique.
|
|
*/
|
|
pkt = &rbufp->recv_pkt;
|
|
for (i = 0; i < NTP_HASH_SIZE; i++) {
|
|
if (peer_hash_count[i] == 0)
|
|
continue;
|
|
|
|
for (peer = peer_hash[i]; peer != 0; peer =
|
|
peer->next) {
|
|
if (peer->cast_flags & MDF_ACAST) {
|
|
NTOHL_FP(&pkt->org, &p_org);
|
|
if (L_ISEQU(&peer->xmt, &p_org))
|
|
return (peer);
|
|
}
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|