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bgpdump_lib.c
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/*
Copyright (c) 2007 - 2010 RIPE NCC - All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided
that the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation, and that the name of the author not be used in advertising or
publicity pertaining to distribution of the software without specific,
written prior permission.
THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Parts of this code have been engineered after analiyzing GNU Zebra's
source code and therefore might contain declarations/code from GNU
Zebra, Copyright (C) 1999 Kunihiro Ishiguro. Zebra is a free routing
software, distributed under the GNU General Public License. A copy of
this license is included with libbgpdump.
*/
#include "bgpdump-config.h"
#include "cfile_tools.h"
#include "bgpdump_lib.h"
#include "bgpdump_mstream.h"
#include "util.h"
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <zlib.h>
#include <assert.h>
void bgpdump_free_attr(attributes_t *attr);
static BGPDUMP_ENTRY* bgpdump_entry_create(BGPDUMP *dump);
static int process_mrtd_bgp(struct mstream *s, BGPDUMP_ENTRY *entry);
static int process_mrtd_table_dump(struct mstream *s,BGPDUMP_ENTRY *entry);
static int process_mrtd_table_dump_v2(struct mstream *s,BGPDUMP_ENTRY *entry);
static int process_mrtd_table_dump_v2_peer_index_table(struct mstream *s,BGPDUMP_ENTRY *entry);
static int process_mrtd_table_dump_v2_ipv4_unicast(struct mstream *s,BGPDUMP_ENTRY *entry);
static int process_mrtd_table_dump_v2_ipv6_unicast(struct mstream *s,BGPDUMP_ENTRY *entry);
static int process_zebra_bgp(struct mstream *s,BGPDUMP_ENTRY *entry);
static int process_zebra_bgp_state_change(struct mstream *s,BGPDUMP_ENTRY *entry, u_int8_t asn_len);
static int process_zebra_bgp_message(struct mstream *s,BGPDUMP_ENTRY *entry, u_int8_t asn_len);
static int process_zebra_bgp_message_update(struct mstream *s,BGPDUMP_ENTRY *entry, u_int8_t asn_len);
static int process_zebra_bgp_message_open(struct mstream *s,BGPDUMP_ENTRY *entry, u_int8_t asn_len);
static int process_zebra_bgp_message_notify(struct mstream *s,BGPDUMP_ENTRY *entry);
static int process_zebra_bgp_entry(struct mstream *s,BGPDUMP_ENTRY *entry);
static int process_zebra_bgp_snapshot(struct mstream *s,BGPDUMP_ENTRY *entry);
static attributes_t *process_attributes(struct mstream *s, u_int8_t asn_len, struct zebra_incomplete *incomplete, int is_addp);
static void process_attr_aspath_string(struct aspath *as);
static char aspath_delimiter_char (u_char type, u_char which);
static void process_attr_community_string(struct community *com);
static void process_attr_lcommunity_string(struct lcommunity *lcom);
static void process_mp_announce(struct mstream *s, struct mp_info *info, struct zebra_incomplete *incomplete, int is_addp);
static void process_mp_withdraw(struct mstream *s, struct mp_info *info, struct zebra_incomplete *incomplete, int is_addp);
static int read_prefix_list(struct mstream *s, u_int16_t af, struct prefix **prefixarray, struct zebra_incomplete *incomplete, int is_addp);
static as_t read_asn(struct mstream *s, u_int8_t len);
static struct aspath *create_aspath(u_int16_t len, u_int8_t asn_len);
static void aspath_error(struct aspath *as);
static int check_new_aspath(struct aspath *aspath);
static void process_asn32_trans(attributes_t *attr, u_int8_t asn_len);
static struct aspath *asn32_merge_paths(struct aspath *path, struct aspath *newpath);
static void asn32_expand_16_to_32(char *dst, char *src, int len);
#ifndef HAVE_STRLCAT
static size_t strlcat(char *dst, const char *src, size_t size);
#endif
char *bgpdump_version(void) {
return PACKAGE_VERSION;
}
BGPDUMP *bgpdump_open_dump(const char *filename) {
CFRFILE *f = cfr_open(filename);
if(! f) {
perror("can't open dumpfile");
return NULL;
}
BGPDUMP *this_dump = malloc(sizeof(BGPDUMP));
if (this_dump == NULL) {
perror("malloc");
return NULL;
}
strcpy(this_dump->filename, "[STDIN]");
if(filename && strcmp(filename, "-")) {
if (strlen(filename) >= BGPDUMP_MAX_FILE_LEN - 1) {
fprintf (stderr, "File name %s is too long.\n", filename);
exit(1);
}
strcpy(this_dump->filename, filename);
}
this_dump->f = f;
this_dump->eof=0;
this_dump->parsed = 0;
this_dump->parsed_ok = 0;
// peer index table shared among entries
this_dump->table_dump_v2_peer_index_table = NULL;
return this_dump;
}
void bgpdump_close_dump(BGPDUMP *dump) {
if(dump == NULL) {
return;
}
if(dump->table_dump_v2_peer_index_table){
free(dump->table_dump_v2_peer_index_table->entries);
}
free(dump->table_dump_v2_peer_index_table);
cfr_close(dump->f);
free(dump);
}
BGPDUMP_ENTRY* bgpdump_entry_create(BGPDUMP *dump){
BGPDUMP_ENTRY *this_entry = malloc(sizeof(BGPDUMP_ENTRY));
if(this_entry == NULL) {
err("%s: out of memory", __func__);
return NULL;
}
memset(this_entry, 0, sizeof(BGPDUMP_ENTRY));
this_entry->dump = dump;
return this_entry;
}
BGPDUMP_ENTRY* bgpdump_read_next(BGPDUMP *dump) {
assert(dump);
struct mstream s;
u_char *buffer;
int ok=0;
u_int32_t bytes_read, t;
BGPDUMP_ENTRY *this_entry = bgpdump_entry_create(dump);
if(this_entry == NULL) {
err("%s: out of memmory", __func__);
dump->eof = 1;
return(NULL);
}
bytes_read = cfr_read_n(dump->f, &t, 4);
bytes_read += cfr_read_n(dump->f, &(this_entry->type), 2);
bytes_read += cfr_read_n(dump->f, &(this_entry->subtype), 2);
bytes_read += cfr_read_n(dump->f, &(this_entry->length), 4);
if (bytes_read == 12) {
/* Intel byte ordering stuff ... */
this_entry->type = ntohs(this_entry->type);
this_entry->subtype = ntohs(this_entry->subtype);
this_entry->time = (time_t) ntohl (t);
this_entry->length = ntohl(this_entry->length);
/* If Extended Header format, then reading the miscroseconds attribute */
if (this_entry->type == BGPDUMP_TYPE_ZEBRA_BGP_ET) {
bytes_read += cfr_read_n(dump->f, &(this_entry->ms), 4);
if (bytes_read == 16) {
this_entry->ms = ntohl(this_entry->ms);
/* "The Microsecond Timestamp is included in the computation of
* the Length field value." (RFC6396 2011) */
this_entry->length -= 4;
ok = 1;
}
} else {
this_entry->ms = 0;
ok = 1;
}
}
if (!ok) {
if(bytes_read > 0) {
/* Malformed record */
err("bgpdump_read_next: incomplete MRT header (%d bytes read, expecting 12 or 16)",
bytes_read);
}
/* Nothing more to read, quit */
free(this_entry);
dump->eof = 1;
return(NULL);
}
dump->parsed++;
this_entry->attr=NULL;
if(this_entry->length == 0) {
err("%s: invalid entry length: 0", __func__);
free(this_entry);
dump->eof=1;
return(NULL);
}
if ((buffer = malloc(this_entry->length)) == NULL) {
err("%s: out of memory", __func__);
free(this_entry);
dump->eof=1;
return(NULL);
}
bytes_read = cfr_read_n(dump->f, buffer, this_entry->length);
if(bytes_read != this_entry->length) {
err("bgpdump_read_next: incomplete dump record (%d bytes read, expecting %d)",
bytes_read, this_entry->length);
free(this_entry);
free(buffer);
dump->eof=1;
return(NULL);
}
ok=0;
mstream_init(&s,buffer,this_entry->length);
switch(this_entry->type) {
case BGPDUMP_TYPE_MRTD_BGP:
ok = process_mrtd_bgp(&s,this_entry);
break;
case BGPDUMP_TYPE_MRTD_TABLE_DUMP:
ok = process_mrtd_table_dump(&s,this_entry);
break;
case BGPDUMP_TYPE_ZEBRA_BGP:
case BGPDUMP_TYPE_ZEBRA_BGP_ET:
ok = process_zebra_bgp(&s,this_entry);
break;
case BGPDUMP_TYPE_TABLE_DUMP_V2:
ok = process_mrtd_table_dump_v2(&s,this_entry);
break;
}
free(buffer);
if(ok) {
dump->parsed_ok++;
} else {
bgpdump_free_mem(this_entry);
return NULL;
}
return this_entry;
}
static void bgpdump_free_mp_info(struct mp_info *info) {
u_int16_t afi;
u_int8_t safi;
for(afi = 1; afi <= BGPDUMP_MAX_AFI; afi++) {
for(safi = 1; safi <= BGPDUMP_MAX_SAFI; safi++) {
if(info->announce[afi][safi]) {
if(info->announce[afi][safi]->nlri) {
free(info->announce[afi][safi]->nlri);
info->announce[afi][safi]->nlri = NULL;
}
free(info->announce[afi][safi]);
info->announce[afi][safi] = NULL;
}
if(info->withdraw[afi][safi]) {
if(info->withdraw[afi][safi]->nlri) {
free(info->withdraw[afi][safi]->nlri);
info->withdraw[afi][safi]->nlri = NULL;
}
free(info->withdraw[afi][safi]);
info->withdraw[afi][safi] = NULL;
}
}
}
free(info);
}
void bgpdump_free_mem(BGPDUMP_ENTRY *entry) {
if(entry!=NULL) {
bgpdump_free_attr(entry->attr);
switch(entry->type) {
case BGPDUMP_TYPE_MRTD_BGP:
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_MRTD_BGP_UPDATE:
if(entry->body.mrtd_message.withdraw != NULL)
free(entry->body.mrtd_message.withdraw);
if(entry->body.mrtd_message.announce != NULL)
free(entry->body.mrtd_message.announce);
break;
}
break;
case BGPDUMP_TYPE_ZEBRA_BGP:
case BGPDUMP_TYPE_ZEBRA_BGP_ET:
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL_ADDPATH:
switch(entry->body.zebra_message.type) {
case BGP_MSG_UPDATE:
if(entry->body.zebra_message.withdraw != NULL)
free(entry->body.zebra_message.withdraw);
if(entry->body.zebra_message.announce != NULL)
free(entry->body.zebra_message.announce);
break;
case BGP_MSG_NOTIFY:
if(entry->body.zebra_message.notify_data)
free(entry->body.zebra_message.notify_data);
break;
case BGP_MSG_OPEN:
if(entry->body.zebra_message.opt_data)
free(entry->body.zebra_message.opt_data);
break;
}
break;
}
break;
case BGPDUMP_TYPE_TABLE_DUMP_V2:
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV4_UNICAST:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV6_UNICAST:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV4_UNICAST_ADDPATH:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV6_UNICAST_ADDPATH:
{
BGPDUMP_TABLE_DUMP_V2_PREFIX *e;
e = &entry->body.mrtd_table_dump_v2_prefix;
int i;
// Conditional as the entries have already been free'd in this case
if(!(e->entry_count && entry->dump->table_dump_v2_peer_index_table == NULL)) {
for(i = 0; i < e->entry_count; i++){
bgpdump_free_attr(e->entries[i].attr);
}
free(e->entries);
}
}
}
break;
}
free(entry);
}
}
void bgpdump_free_attr(attributes_t *attr){
if(attr != NULL) {
u_int16_t i;
struct aspath *path, *pathstofree[3] = { attr->aspath, attr->old_aspath, attr->new_aspath };
for(i = 0; i < sizeof(pathstofree) / sizeof(pathstofree[0]); i++) {
path = pathstofree[i];
if(path) {
if(path->data)
free(path->data);
if(path->str)
free(path->str);
free(path);
}
}
if(attr->community != NULL) {
if(attr->community->val != NULL)
free(attr->community->val);
if(attr->community->str != NULL)
free(attr->community->str);
free(attr->community);
}
if(attr->lcommunity != NULL) {
if(attr->lcommunity->val != NULL)
free(attr->lcommunity->val);
if(attr->lcommunity->str != NULL)
free(attr->lcommunity->str);
free(attr->lcommunity);
}
if(attr->data != NULL)
free(attr->data);
if(attr->mp_info != NULL)
bgpdump_free_mp_info(attr->mp_info);
if(attr->cluster != NULL) {
free(attr->cluster->list);
free(attr->cluster);
}
if (attr->unknown_num) {
for (i = 0; i < attr->unknown_num; i++)
free(attr->unknown[i].raw);
free(attr->unknown);
}
free(attr);
}
}
/* Helper function to check if this is an Additional Paths enabled subtype (exported) */
int is_addpath(BGPDUMP_ENTRY *entry) {
switch(entry->type) {
case BGPDUMP_TYPE_ZEBRA_BGP:
case BGPDUMP_TYPE_ZEBRA_BGP_ET:
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL_ADDPATH:
return 1;
default:
return 0;
}
case BGPDUMP_TYPE_TABLE_DUMP_V2:
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV4_UNICAST_ADDPATH:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV4_MULTICAST_ADDPATH:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV6_UNICAST_ADDPATH:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV6_MULTICAST_ADDPATH:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_GENERIC_ADDPATH:
return 1;
default:
return 0;
}
default:
return 0;
}
}
int process_mrtd_bgp(struct mstream *s, BGPDUMP_ENTRY *entry) {
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_MRTD_BGP_UPDATE:
case BGPDUMP_SUBTYPE_MRTD_BGP_KEEPALIVE:
entry->body.mrtd_message.source_as = read_asn(s, ASN16_LEN);
entry->body.mrtd_message.source_ip = mstream_get_ipv4(s);
entry->body.mrtd_message.destination_as = read_asn(s, ASN16_LEN);
entry->body.mrtd_message.destination_ip = mstream_get_ipv4(s);
mstream_t withdraw_stream = mstream_copy(s, mstream_getw(s, NULL));
entry->body.mrtd_message.withdraw_count = read_prefix_list(&withdraw_stream, AFI_IP,
&entry->body.mrtd_message.withdraw,
&entry->body.mrtd_message.incomplete, 0);
if((entry->attr = process_attributes(s, ASN16_LEN, &entry->body.mrtd_message.incomplete, 0)) == NULL)
return 0;
entry->body.mrtd_message.announce_count = read_prefix_list(s, AFI_IP,
&entry->body.mrtd_message.announce,
&entry->body.mrtd_message.incomplete, 0);
break;
case BGPDUMP_SUBTYPE_MRTD_BGP_STATE_CHANGE:
entry->body.mrtd_state_change.destination_as = read_asn(s, ASN16_LEN);
entry->body.mrtd_state_change.destination_ip = mstream_get_ipv4(s);
entry->body.mrtd_state_change.old_state = mstream_getw(s, NULL);
entry->body.mrtd_state_change.new_state = mstream_getw(s, NULL);
break;
}
return 1;
}
int process_mrtd_table_dump(struct mstream *s,BGPDUMP_ENTRY *entry) {
int afi = entry->subtype;
u_int8_t asn_len;
u_int32_t temp_time = 0;
mstream_getw(s,&entry->body.mrtd_table_dump.view);
mstream_getw(s,&entry->body.mrtd_table_dump.sequence);
switch(afi) {
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP:
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP_32BIT_AS:
entry->body.mrtd_table_dump.prefix.v4_addr = mstream_get_ipv4(s);
break;
#ifdef BGPDUMP_HAVE_IPV6
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP6:
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP6_32BIT_AS:
mstream_get(s, &entry->body.mrtd_table_dump.prefix.v6_addr.s6_addr, 16);
break;
#endif
default:
warn("process_mrtd_table_dump: unknown AFI %d", afi);
mstream_get(s, NULL, mstream_can_read(s));
return 0;
}
mstream_getc(s,&entry->body.mrtd_table_dump.mask);
mstream_getc(s,&entry->body.mrtd_table_dump.status);
mstream_getl(s,&temp_time);
(entry->body).mrtd_table_dump.uptime = temp_time;
switch(afi) {
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP:
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP_32BIT_AS:
entry->body.mrtd_table_dump.peer_ip.v4_addr = mstream_get_ipv4(s);
break;
#ifdef BGPDUMP_HAVE_IPV6
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP6:
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP6_32BIT_AS:
mstream_get(s, &entry->body.mrtd_table_dump.peer_ip.v6_addr.s6_addr, 16);
break;
#endif
}
switch(afi) {
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP:
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP6:
asn_len = ASN16_LEN;
break;
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP_32BIT_AS:
case BGPDUMP_SUBTYPE_MRTD_TABLE_DUMP_AFI_IP6_32BIT_AS:
asn_len = ASN32_LEN;
break;
default:
assert(0); // unreachable
}
entry->body.mrtd_table_dump.peer_as = read_asn(s, asn_len);
if((entry->attr = process_attributes(s, asn_len, NULL, 0)) == NULL)
return 0;
return 1;
}
int process_mrtd_table_dump_v2(struct mstream *s,BGPDUMP_ENTRY *entry) {
switch(entry->subtype){
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_PEER_INDEX_TABLE:
return process_mrtd_table_dump_v2_peer_index_table(s, entry);
break;
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV4_UNICAST:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV4_UNICAST_ADDPATH:
return process_mrtd_table_dump_v2_ipv4_unicast(s, entry);
break;
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV6_UNICAST:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_IPV6_UNICAST_ADDPATH:
return process_mrtd_table_dump_v2_ipv6_unicast(s, entry);
break;
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_GENERIC:
case BGPDUMP_SUBTYPE_TABLE_DUMP_V2_RIB_GENERIC_ADDPATH:
//return process_mrtd_table_dump_v2_generic(s, entry);
break;
}
return 0;
}
int process_mrtd_table_dump_v2_peer_index_table(struct mstream *s,BGPDUMP_ENTRY *entry) {
BGPDUMP_TABLE_DUMP_V2_PEER_INDEX_TABLE *t;
uint16_t i;
uint8_t peertype;
uint16_t view_name_len;
if(entry->dump->table_dump_v2_peer_index_table) {
free(entry->dump->table_dump_v2_peer_index_table->entries);
}
free(entry->dump->table_dump_v2_peer_index_table);
if((entry->dump->table_dump_v2_peer_index_table = malloc(sizeof(BGPDUMP_TABLE_DUMP_V2_PEER_INDEX_TABLE))) == NULL) {
err("process_mrtd_table_dump_v2_peer_index_table: failed to allocate memory for index table");
return 0;
}
t = entry->dump->table_dump_v2_peer_index_table;
t->entries = NULL;
t->local_bgp_id = mstream_get_ipv4(s);
mstream_getw(s,&view_name_len);
strcpy(t->view_name, "");
// view_name_len is without trailing \0
if(view_name_len+1 > BGPDUMP_TYPE_TABLE_DUMP_V2_MAX_VIEWNAME_LEN) {
warn("process_mrtd_table_dump_v2_peer_index_table: view name length more than maximum length (%d), ignoring view name", BGPDUMP_TYPE_TABLE_DUMP_V2_MAX_VIEWNAME_LEN);
} else {
mstream_get(s, t->view_name, view_name_len);
t->view_name[view_name_len] = 0;
}
mstream_getw(s,&t->peer_count);
t->entries = malloc(sizeof(BGPDUMP_TABLE_DUMP_V2_PEER_INDEX_TABLE_ENTRY) * t->peer_count);
if(t->entries == NULL){
err("process_mrtd_table_dump_v2_peer_index_table: failed to allocate memory for index table");
return 0;
}
for(i=0; i < t->peer_count; i++) {
mstream_getc(s,&peertype);
t->entries[i].afi = AFI_IP;
#ifdef BGPDUMP_HAVE_IPV6
if(peertype & BGPDUMP_PEERTYPE_TABLE_DUMP_V2_AFI_IP6)
t->entries[i].afi = AFI_IP6;
#endif
t->entries[i].peer_bgp_id = mstream_get_ipv4(s);
if(t->entries[i].afi == AFI_IP)
t->entries[i].peer_ip.v4_addr = mstream_get_ipv4(s);
#ifdef BGPDUMP_HAVE_IPV6
else
mstream_get(s, &t->entries[i].peer_ip.v6_addr.s6_addr, 16);
#endif
if(peertype & BGPDUMP_PEERTYPE_TABLE_DUMP_V2_AS4)
t->entries[i].peer_as = read_asn(s, ASN32_LEN);
else
t->entries[i].peer_as = read_asn(s, ASN16_LEN);
}
return 0;
}
int process_mrtd_table_dump_v2_ipv4_unicast(struct mstream *s, BGPDUMP_ENTRY *entry){
BGPDUMP_TABLE_DUMP_V2_PREFIX *prefixdata;
prefixdata = &entry->body.mrtd_table_dump_v2_prefix;
int addpath = is_addpath(entry);
uint16_t i;
prefixdata->afi = AFI_IP;
prefixdata->safi = SAFI_UNICAST;
mstream_getl(s, &prefixdata->seq);
mstream_getc(s, &prefixdata->prefix_length);
bzero(&prefixdata->prefix.v4_addr.s_addr, 4);
mstream_get(s, &prefixdata->prefix.v4_addr.s_addr, (prefixdata->prefix_length+7)/8);
mstream_getw(s, &prefixdata->entry_count);
prefixdata->entries = malloc(sizeof(BGPDUMP_TABLE_DUMP_V2_ROUTE_ENTRY) * prefixdata->entry_count);
if(prefixdata->entries == NULL){
err("process_mrtd_table_dump_v2_ipv4_unicast: failed to allocate memory for entry table");
return 0;
}
if(prefixdata->entry_count && entry->dump->table_dump_v2_peer_index_table == NULL) {
free(prefixdata->entries);
err("%s: missing peer index table", __func__);
return 0;
}
for(i=0; i < prefixdata->entry_count; i++){
BGPDUMP_TABLE_DUMP_V2_ROUTE_ENTRY *e;
e = &prefixdata->entries[i];
mstream_getw(s, &e->peer_index);
assert(e->peer_index < entry->dump->table_dump_v2_peer_index_table->peer_count);
e->peer = &entry->dump->table_dump_v2_peer_index_table->entries[e->peer_index];
mstream_getl(s, &e->originated_time);
if (addpath)
mstream_getl(s, &e->path_id);
if((e->attr = process_attributes(s, 4, NULL, is_addpath(entry))) == NULL)
return 0;
}
return 1;
}
int process_mrtd_table_dump_v2_ipv6_unicast(struct mstream *s, BGPDUMP_ENTRY *entry){
#ifdef BGPDUMP_HAVE_IPV6
BGPDUMP_TABLE_DUMP_V2_PREFIX *prefixdata;
prefixdata = &entry->body.mrtd_table_dump_v2_prefix;
int addpath = is_addpath(entry);
uint16_t i;
prefixdata->afi = AFI_IP6;
prefixdata->safi = SAFI_UNICAST;
mstream_getl(s, &prefixdata->seq);
mstream_getc(s, &prefixdata->prefix_length);
bzero(&prefixdata->prefix.v6_addr.s6_addr, 16);
mstream_get(s, &prefixdata->prefix.v6_addr.s6_addr, (prefixdata->prefix_length+7)/8);
mstream_getw(s, &prefixdata->entry_count);
prefixdata->entries = malloc(sizeof(BGPDUMP_TABLE_DUMP_V2_ROUTE_ENTRY) * prefixdata->entry_count);
if(prefixdata->entries == NULL){
err("process_mrtd_table_dump_v2_ipv6_unicast: failed to allocate memory for entry table");
return 0;
}
if(prefixdata->entry_count && entry->dump->table_dump_v2_peer_index_table == NULL) {
free(prefixdata->entries);
err("%s: missing peer index table", __func__);
return 0;
}
for(i=0; i < prefixdata->entry_count; i++){
BGPDUMP_TABLE_DUMP_V2_ROUTE_ENTRY *e;
e = &prefixdata->entries[i];
mstream_getw(s, &e->peer_index);
assert(e->peer_index < entry->dump->table_dump_v2_peer_index_table->peer_count);
e->peer = &entry->dump->table_dump_v2_peer_index_table->entries[e->peer_index];
mstream_getl(s, &e->originated_time);
if (addpath)
mstream_getl(s, &e->path_id);
if((e->attr = process_attributes(s, 4, NULL, is_addpath(entry))) == NULL)
return 0;
}
#endif
return 1;
}
int process_zebra_bgp(struct mstream *s,BGPDUMP_ENTRY *entry) {
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_ZEBRA_BGP_STATE_CHANGE:
return process_zebra_bgp_state_change(s, entry, ASN16_LEN);
case BGPDUMP_SUBTYPE_ZEBRA_BGP_STATE_CHANGE_AS4:
return process_zebra_bgp_state_change(s, entry, ASN32_LEN);
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL_ADDPATH:
return process_zebra_bgp_message(s, entry, ASN16_LEN);
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL_ADDPATH:
return process_zebra_bgp_message(s, entry, ASN32_LEN);
case BGPDUMP_SUBTYPE_ZEBRA_BGP_ENTRY:
return process_zebra_bgp_entry(s,entry);
case BGPDUMP_SUBTYPE_ZEBRA_BGP_SNAPSHOT:
return process_zebra_bgp_snapshot(s, entry);
default:
warn("process_zebra_bgp: unknown subtype %d", entry->subtype);
return 0;
}
}
int process_zebra_bgp_state_change(struct mstream *s,BGPDUMP_ENTRY *entry, u_int8_t asn_len) {
entry->body.zebra_state_change.source_as = read_asn(s, asn_len);
entry->body.zebra_state_change.destination_as = read_asn(s, asn_len);
/* Work around Zebra dump corruption.
* N.B. I don't see this in quagga 0.96.4 any more. Is it fixed? */
if (entry->length == 8) {
warn("process_zebra_bgp_state_change: 8-byte state change (zebra bug?)");
mstream_getw(s,&entry->body.zebra_state_change.old_state);
mstream_getw(s,&entry->body.zebra_state_change.new_state);
/* Fill in with dummy values */
entry->body.zebra_state_change.interface_index = 0;
entry->body.zebra_state_change.address_family = AFI_IP;
entry->body.zebra_state_change.source_ip.v4_addr.s_addr = 0;
entry->body.zebra_state_change.destination_ip.v4_addr.s_addr = 0;
return 1;
}
mstream_getw(s,&entry->body.zebra_state_change.interface_index);
mstream_getw(s,&entry->body.zebra_state_change.address_family);
switch(entry->body.zebra_state_change.address_family) {
case AFI_IP:
// length could be 20 or 24 (asn16 vs asn32)
if(entry->length != 20 && entry->length != 24) {
warn("process_zebra_bgp_state_change: bad length %d",
entry->length);
return 0;
}
entry->body.zebra_state_change.source_ip.v4_addr = mstream_get_ipv4(s);
entry->body.zebra_state_change.destination_ip.v4_addr = mstream_get_ipv4(s);
break;
#ifdef BGPDUMP_HAVE_IPV6
case AFI_IP6:
// length could be 44 or 48 (asn16 vs asn32)
if(entry->length != 44 && entry->length != 48) {
warn("process_zebra_bgp_state_change: bad length %d",
entry->length);
return 0;
}
mstream_get(s, &entry->body.zebra_state_change.source_ip.v6_addr.s6_addr, 16);
mstream_get(s, &entry->body.zebra_state_change.destination_ip.v6_addr.s6_addr, 16);
break;
#endif
default:
warn("process_zebra_bgp_state_change: unknown AFI %d",
entry->body.zebra_state_change.address_family);
return 0;
}
mstream_getw(s,&entry->body.zebra_state_change.old_state);
mstream_getw(s,&entry->body.zebra_state_change.new_state);
return 1;
}
int process_zebra_bgp_message(struct mstream *s,BGPDUMP_ENTRY *entry, u_int8_t asn_len) {
u_char marker[16]; /* BGP marker */
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL_ADDPATH:
entry->body.zebra_message.destination_as = read_asn(s, asn_len);
entry->body.zebra_message.source_as = read_asn(s, asn_len);
break;
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_ADDPATH:
default:
entry->body.zebra_message.source_as = read_asn(s, asn_len);
entry->body.zebra_message.destination_as = read_asn(s, asn_len);
break;
}
mstream_getw(s,&entry->body.zebra_message.interface_index);
mstream_getw(s,&entry->body.zebra_message.address_family);
/* Initialize announce and withdraw arrays: if there is a
* parse error, they will not be free()d, and we will not segfault. */
entry->body.zebra_message.withdraw = NULL;
entry->body.zebra_message.announce = NULL;
entry->body.zebra_message.opt_len = 0;
entry->body.zebra_message.opt_data = NULL;
entry->body.zebra_message.notify_len = 0;
entry->body.zebra_message.notify_data = NULL;
switch(entry->body.zebra_message.address_family) {
case AFI_IP:
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL_ADDPATH:
entry->body.zebra_message.destination_ip.v4_addr = mstream_get_ipv4(s);
entry->body.zebra_message.source_ip.v4_addr = mstream_get_ipv4(s);
break;
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_ADDPATH:
default:
entry->body.zebra_message.source_ip.v4_addr = mstream_get_ipv4(s);
entry->body.zebra_message.destination_ip.v4_addr = mstream_get_ipv4(s);
break;
}
mstream_get (s, marker, 16);
break;
#ifdef BGPDUMP_HAVE_IPV6
case AFI_IP6:
switch(entry->subtype) {
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_LOCAL_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_LOCAL_ADDPATH:
mstream_get(s,&entry->body.zebra_message.destination_ip.v6_addr.s6_addr, 16);
mstream_get(s,&entry->body.zebra_message.source_ip.v6_addr.s6_addr, 16);
break;
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_ADDPATH:
case BGPDUMP_SUBTYPE_ZEBRA_BGP_MESSAGE_AS4_ADDPATH:
default:
mstream_get(s,&entry->body.zebra_message.source_ip.v6_addr.s6_addr, 16);
mstream_get(s,&entry->body.zebra_message.destination_ip.v6_addr.s6_addr, 16);
break;
}
mstream_get (s, marker, 16);
break;
#endif
case 0xFFFF:
/* Zebra doesn't dump ifindex or src/dest IPs in OPEN
* messages. Work around it. */
if (entry->body.zebra_message.interface_index == 0xFFFF) {
memset(marker, 0xFF, 4);
mstream_get (s, marker + 4, 12);
entry->body.zebra_message.interface_index = 0;
entry->body.zebra_message.address_family = AFI_IP;
entry->body.zebra_message.source_ip.v4_addr.s_addr = 0;
entry->body.zebra_message.destination_ip.v4_addr.s_addr = 0;
break;
}
/* Note fall through! If we don't recognize this type of data corruption, we say
* the address family is unsupported (since FFFF is not a valid address family) */
default:
/* unsupported address family */
warn("process_zebra_bgp_message: unsupported AFI %d",
entry->body.zebra_message.address_family);
return 0;
}
if(memcmp(marker, "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377", 16) != 0) {
/* bad marker... ignore packet */
warn(
"bgp_message: bad marker: %02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x",
marker[0],marker[1],marker[2],marker[3],marker[4],marker[5],marker[6],marker[7],
marker[8],marker[9],marker[10],marker[11],marker[12],marker[13],marker[14],marker[15]);
return 0;
}
mstream_getw(s,&entry->body.zebra_message.size);
int expected = entry->body.zebra_message.size - sizeof(marker) - sizeof(u_int16_t);
mstream_t copy = mstream_copy(s, expected);
entry->body.zebra_message.cut_bytes = expected - mstream_can_read(©);
switch(mstream_getc (©, &entry->body.zebra_message.type)) {
case BGP_MSG_OPEN:
return process_zebra_bgp_message_open(©, entry, asn_len);
case BGP_MSG_UPDATE:
return process_zebra_bgp_message_update(©, entry, asn_len);
case BGP_MSG_NOTIFY:
return process_zebra_bgp_message_notify(©, entry);
case BGP_MSG_KEEPALIVE:
/* Nothing to do */
return 1;
case BGP_MSG_ROUTE_REFRESH_01:
/* Not implemented yet */
warn("bgp_message: MSG_ROUTE_REFRESH_01 not implemented yet");
return 0;
case BGP_MSG_ROUTE_REFRESH:
/* Not implemented yet */
warn("bgp_message: MSG_ROUTE_REFRESH not implemented yet");
return 0;
default:
warn("bgp_message: unknown BGP message type %d",
entry->body.zebra_message.type);
return 0;
}
}
int process_zebra_bgp_message_notify(struct mstream *s, BGPDUMP_ENTRY *entry) {
mstream_getc(s, &entry->body.zebra_message.error_code);
mstream_getc(s, &entry->body.zebra_message.sub_error_code);
entry->body.zebra_message.notify_len = entry->body.zebra_message.size - 21;
if(entry->body.zebra_message.notify_len > 0) {
if((entry->body.zebra_message.notify_data = malloc(entry->body.zebra_message.notify_len)) == NULL) {
err("%s: out of memory", __func__);
return 0;
}
mstream_get(s, entry->body.zebra_message.notify_data, entry->body.zebra_message.notify_len);
}
return 1;
}
int process_zebra_bgp_message_open(struct mstream *s, BGPDUMP_ENTRY *entry, u_int8_t asn_len) {
mstream_getc(s, &entry->body.zebra_message.version);
// my_as in open is always 16bits, regardless of MRT subtype
entry->body.zebra_message.my_as = read_asn(s, ASN16_LEN);
mstream_getw(s, &entry->body.zebra_message.hold_time);
entry->body.zebra_message.bgp_id = mstream_get_ipv4(s);
mstream_getc(s, &entry->body.zebra_message.opt_len);
if(entry->body.zebra_message.opt_len) {
if((entry->body.zebra_message.opt_data = malloc(entry->body.zebra_message.opt_len)) == NULL) {
err("%s: out of memory", __func__);
return 0;
}
mstream_get(s, entry->body.zebra_message.opt_data, entry->body.zebra_message.opt_len);
}
return 1;
}
int process_zebra_bgp_message_update(struct mstream *s, BGPDUMP_ENTRY *entry, u_int8_t asn_len) {
entry->body.zebra_message.incomplete.orig_len = 0;
mstream_t withdraw_stream = mstream_copy(s, mstream_getw(s, NULL));
entry->body.zebra_message.withdraw_count = read_prefix_list(&withdraw_stream, AFI_IP,
&entry->body.zebra_message.withdraw,
&entry->body.zebra_message.incomplete,
is_addpath(entry));
if((entry->attr = process_attributes(s, asn_len, &entry->body.zebra_message.incomplete, is_addpath(entry))) == NULL)
return 0;