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pimd: Move ACL handling to pim_util.c

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Move the extended access-list handling from pim_msdp_packet.c to
pim_util.c to allow use elsewhere in the daemon.

Signed-off-by: Corey Siltala <csiltala@atcorp.com>
This commit is contained in:
Corey Siltala 2024-11-25 10:43:30 -06:00
parent f1a9b9292c
commit a9bee74ea2
3 changed files with 46 additions and 49 deletions
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51
pimd/pim_msdp_packet.c
View file

@ -367,53 +367,6 @@ static void pim_msdp_pkt_sa_fill_one(struct pim_msdp_sa *sa)
stream_put_ipv4(sa->pim->msdp.work_obuf, sa->sg.src.s_addr);
}
static bool msdp_cisco_match(const struct filter *filter,
const struct in_addr *source,
const struct in_addr *group)
{
const struct filter_cisco *cfilter = &filter->u.cfilter;
uint32_t source_addr;
uint32_t group_addr;
group_addr = group->s_addr & ~cfilter->mask_mask.s_addr;
if (cfilter->extended) {
source_addr = source->s_addr & ~cfilter->addr_mask.s_addr;
if (group_addr == cfilter->mask.s_addr &&
source_addr == cfilter->addr.s_addr)
return true;
} else if (group_addr == cfilter->addr.s_addr)
return true;
return false;
}
static enum filter_type msdp_access_list_apply(struct access_list *access,
const struct in_addr *source,
const struct in_addr *group)
{
struct filter *filter;
struct prefix group_prefix;
if (access == NULL)
return FILTER_DENY;
for (filter = access->head; filter; filter = filter->next) {
if (filter->cisco) {
if (msdp_cisco_match(filter, source, group))
return filter->type;
} else {
group_prefix.family = AF_INET;
group_prefix.prefixlen = IPV4_MAX_BITLEN;
group_prefix.u.prefix4.s_addr = group->s_addr;
if (access_list_apply(access, &group_prefix))
return filter->type;
}
}
return FILTER_DENY;
}
bool msdp_peer_sa_filter(const struct pim_msdp_peer *mp,
const struct pim_msdp_sa *sa)
{
@ -425,7 +378,7 @@ bool msdp_peer_sa_filter(const struct pim_msdp_peer *mp,
/* Find access list and test it. */
acl = access_list_lookup(AFI_IP, mp->acl_out);
if (msdp_access_list_apply(acl, &sa->sg.src, &sa->sg.grp) == FILTER_DENY)
if (pim_access_list_apply(acl, &sa->sg.src, &sa->sg.grp) == FILTER_DENY)
return true;
return false;
@ -641,7 +594,7 @@ static void pim_msdp_pkt_sa_rx_one(struct pim_msdp_peer *mp, struct in_addr rp)
/* Filter incoming SA with configured access list. */
if (mp->acl_in) {
acl = access_list_lookup(AFI_IP, mp->acl_in);
if (msdp_access_list_apply(acl, &sg.src, &sg.grp) == FILTER_DENY) {
if (pim_access_list_apply(acl, &sg.src, &sg.grp) == FILTER_DENY) {
if (pim_msdp_log_sa_events(mp->pim))
zlog_info("MSDP peer %pI4 filter SA in (%pI4, %pI4)", &mp->peer,
&sg.src, &sg.grp);

41
pimd/pim_util.c
View file

@ -126,6 +126,47 @@ int pim_is_group_224_4(struct in_addr group_addr)
return prefix_match(&group_all, &group);
}
static bool pim_cisco_match(const struct filter *filter, const struct in_addr *source,
const struct in_addr *group)
{
const struct filter_cisco *cfilter = &filter->u.cfilter;
uint32_t source_addr;
uint32_t group_addr;
group_addr = group->s_addr & ~cfilter->mask_mask.s_addr;
if (cfilter->extended) {
source_addr = source->s_addr & ~cfilter->addr_mask.s_addr;
if (group_addr == cfilter->mask.s_addr && source_addr == cfilter->addr.s_addr)
return true;
} else if (group_addr == cfilter->addr.s_addr)
return true;
return false;
}
enum filter_type pim_access_list_apply(struct access_list *access, const struct in_addr *source,
const struct in_addr *group)
{
struct filter *filter;
struct prefix group_prefix = {};
if (access == NULL)
return FILTER_DENY;
for (filter = access->head; filter; filter = filter->next) {
if (filter->cisco) {
if (pim_cisco_match(filter, source, group))
return filter->type;
}
}
group_prefix.family = AF_INET;
group_prefix.prefixlen = IPV4_MAX_BITLEN;
group_prefix.u.prefix4.s_addr = group->s_addr;
return access_list_apply(access, &group_prefix);
}
bool pim_is_group_filtered(struct pim_interface *pim_ifp, pim_addr *grp)
{
struct prefix grp_pfx;

3
pimd/pim_util.h
View file

@ -10,6 +10,7 @@
#include <stdint.h>
#include <zebra.h>
#include "lib/filter.h"
#include "checksum.h"
#include "pimd.h"
@ -22,6 +23,8 @@ void pim_pkt_dump(const char *label, const uint8_t *buf, int size);
int pim_is_group_224_0_0_0_24(struct in_addr group_addr);
int pim_is_group_224_4(struct in_addr group_addr);
enum filter_type pim_access_list_apply(struct access_list *access, const struct in_addr *source,
const struct in_addr *group);
bool pim_is_group_filtered(struct pim_interface *pim_ifp, pim_addr *grp);
int pim_get_all_mcast_group(struct prefix *prefix);
bool pim_addr_is_multicast(pim_addr addr);