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sys/netinet/in_fib_algo.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Alexander V. Chernikov
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/priv.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/vnet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/route.h>
#include <net/route/nhop.h>
#include <net/route/route_ctl.h>
#include <net/route/route_var.h>
#include <net/route/route_algo.h>
#define KEY_LEN_INET (offsetof(struct sockaddr_in, sin_addr) + sizeof(in_addr_t))
#define OFF_LEN_INET (8 * offsetof(struct sockaddr_in, sin_addr))
struct radix4_addr_entry {
struct radix_node rn[2];
struct sockaddr_in addr;
struct nhop_object *nhop;
};
#define LRADIX4_ITEM_SZ roundup2(sizeof(struct radix4_addr_entry), 64)
struct lradix4_data {
struct radix_node_head *rnh;
struct fib_data *fd;
void *mem;
uint32_t alloc_items;
uint32_t num_items;
};
static struct nhop_object *
lradix4_lookup(void *algo_data, const struct flm_lookup_key key, uint32_t scopeid)
{
struct radix_node_head *rnh = (struct radix_node_head *)algo_data;
struct radix4_addr_entry *ent;
struct sockaddr_in addr4 = {
.sin_len = KEY_LEN_INET,
.sin_addr = key.addr4,
};
ent = (struct radix4_addr_entry *)(rnh->rnh_matchaddr(&addr4, &rnh->rh));
if (ent != NULL)
return (ent->nhop);
return (NULL);
}
static uint8_t
lradix4_get_pref(const struct rib_rtable_info *rinfo)
{
if (rinfo->num_prefixes < 10)
return (255);
else if (rinfo->num_prefixes < 100000)
return (255 - rinfo->num_prefixes / 394);
else
return (1);
}
static enum flm_op_result
lradix4_init(uint32_t fibnum, struct fib_data *fd, void *_old_data, void **_data)
{
struct lradix4_data *lr;
struct rib_rtable_info rinfo;
uint32_t count;
lr = malloc(sizeof(struct lradix4_data), M_RTABLE, M_NOWAIT | M_ZERO);
if (lr == NULL || !rn_inithead((void **)&lr->rnh, OFF_LEN_INET))
return (FLM_REBUILD);
fib_get_rtable_info(fib_get_rh(fd), &rinfo);
count = rinfo.num_prefixes * 11 / 10;
// XXX: alignment!
lr->mem = malloc(count * LRADIX4_ITEM_SZ, M_RTABLE, M_NOWAIT | M_ZERO);
if (lr->mem == NULL)
return (FLM_REBUILD);
lr->alloc_items = count;
lr->fd = fd;
*_data = lr;
return (FLM_SUCCESS);
}
static void
lradix4_destroy(void *_data)
{
struct lradix4_data *lr = (struct lradix4_data *)_data;
if (lr->rnh != NULL)
rn_detachhead((void **)&lr->rnh);
if (lr->mem != NULL)
free(lr->mem, M_RTABLE);
free(lr, M_RTABLE);
}
static enum flm_op_result
lradix4_add_route_cb(struct rtentry *rt, void *_data)
{
struct lradix4_data *lr = (struct lradix4_data *)_data;
struct radix4_addr_entry *ae;
struct sockaddr_in *rt_dst, *rt_mask, mask;
struct radix_node *rn;
if (fib_get_nhop_idx(lr->fd, rt->rt_nhop) == 0)
return (FLM_REBUILD);
if (lr->num_items >= lr->alloc_items)
return (FLM_REBUILD);
ae = (struct radix4_addr_entry *)((char *)lr->mem + lr->num_items * LRADIX4_ITEM_SZ);
lr->num_items++;
ae->nhop = rt->rt_nhop;
rt_dst = (struct sockaddr_in *)rt_key(rt);
rt_mask = (struct sockaddr_in *)rt_mask(rt);
ae->addr.sin_len = KEY_LEN_INET;
ae->addr.sin_addr = rt_dst->sin_addr;
if (rt_mask != NULL) {
bzero(&mask, sizeof(mask));
mask.sin_len = KEY_LEN_INET;
mask.sin_addr = rt_mask->sin_addr;
rt_mask = &mask;
}
rn = lr->rnh->rnh_addaddr((struct sockaddr *)&ae->addr,
olivierUnsubmitted
Not Done
Inline Actions

Where rt_get_raw_nhop() is defined ?

--- in_fib_algo.o ---
/usr/src/sys/netinet/in_fib_algo.c:164:7: error: implicit declaration of function 'rt_get_raw_nhop' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        nh = rt_get_raw_nhop(rt);
             ^
/usr/src/sys/netinet/in_fib_algo.c:164:5: error: incompatible integer to pointer conversion assigning to 'struct nhop_object *' from 'int' [-Werror,-Wint-conversion]
        nh = rt_get_raw_nhop(rt);
olivier: Where rt_get_raw_nhop() is defined ? ``` --- in_fib_algo.o…
melifaroAuthorUnsubmitted
Done
Inline Actions

Added in r 368317

melifaro: Added in r 368317
(struct sockaddr *)rt_mask, &lr->rnh->rh, ae->rn);
if (rn == NULL)
return (FLM_REBUILD);
return (FLM_SUCCESS);
}
static enum flm_op_result
lradix4_end_dump(void *_data, struct fib_dp *dp)
{
olivierUnsubmitted
Not Done
Inline Actions

Same here:

/usr/src/sys/netinet/in_fib_algo.c:174:2: error: implicit declaration of function 'rt_get_inet_prefix_pmask' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        rt_get_inet_prefix_pmask(rt, &addr4, &mask4, &scopeid);
olivier: Same here: ``` /usr/src/sys/netinet/in_fib_algo.c:174:2: error: implicit declaration of…
melifaroAuthorUnsubmitted
Done
Inline Actions

Sorry, should have stated that rebase to recent head is required :-(
Added in r368317

melifaro: Sorry, should have stated that rebase to recent head is required :-( Added in r368317
struct lradix4_data *lr = (struct lradix4_data *)_data;
dp->f = lradix4_lookup;
dp->arg = lr->rnh;
return (FLM_SUCCESS);
}
static enum flm_op_result
lradix4_change_cb(struct rib_head *rnh, struct rib_cmd_info *rc,
void *_data)
{
return (FLM_REBUILD);
}
struct fib_lookup_module flm_radix4_lockless = {
.flm_name = "radix4_lockless",
.flm_family = AF_INET,
.flm_init_cb = lradix4_init,
.flm_destroy_cb = lradix4_destroy,
.flm_dump_rib_item_cb = lradix4_add_route_cb,
.flm_dump_end_cb = lradix4_end_dump,
.flm_change_rib_item_cb = lradix4_change_cb,
.flm_get_pref = lradix4_get_pref,
};
struct radix4_data {
struct fib_data *fd;
struct rib_head *rh;
};
static struct nhop_object *
radix4_lookup(void *algo_data, const struct flm_lookup_key key, uint32_t scopeid)
{
RIB_RLOCK_TRACKER;
struct rib_head *rh = (struct rib_head *)algo_data;
struct radix_node *rn;
struct nhop_object *nh;
/* Prepare lookup key */
struct sockaddr_in sin4 = {
.sin_family = AF_INET,
.sin_len = sizeof(struct sockaddr_in),
.sin_addr = key.addr4,
};
nh = NULL;
RIB_RLOCK(rh);
rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0))
nh = (RNTORT(rn))->rt_nhop;
RIB_RUNLOCK(rh);
return (nh);
}
static uint8_t
radix4_get_pref(const struct rib_rtable_info *rinfo)
{
return (50);
}
static enum flm_op_result
radix4_init(uint32_t fibnum, struct fib_data *fd, void *_old_data, void **_data)
{
struct radix4_data *r4;
r4 = malloc(sizeof(struct radix4_data), M_RTABLE, M_NOWAIT | M_ZERO);
if (r4 == NULL)
return (FLM_REBUILD);
r4->fd = fd;
r4->rh = fib_get_rh(fd);
if (r4->rh == NULL)
return (FLM_ERROR);
*_data = r4;
return (FLM_SUCCESS);
}
static void
radix4_destroy(void *_data)
{
free(_data, M_RTABLE);
}
static enum flm_op_result
radix4_end_dump(void *_data, struct fib_dp *dp)
{
struct radix4_data *r4 = (struct radix4_data *)_data;
dp->f = radix4_lookup;
dp->arg = r4->rh;
return (FLM_SUCCESS);
}
static enum flm_op_result
radix4_change_cb(struct rib_head *rnh, struct rib_cmd_info *rc,
void *_data)
{
struct radix4_data *r4 = (struct radix4_data *)_data;
/*
* Grab additional reference for each nexthop to maintain guarantee
* that we have non-zero # of reference for each nexthop in radix in
* the epoch.
*/
if (rc->rc_nh_new != NULL) {
if (fib_get_nhop_idx(r4->fd, rc->rc_nh_new) == 0)
return (FLM_REBUILD);
}
if (rc->rc_nh_old != NULL)
fib_free_nhop(r4->fd, rc->rc_nh_old);
return (FLM_SUCCESS);
}
struct fib_lookup_module flm_radix4 = {
.flm_name = "radix4",
.flm_family = AF_INET,
.flm_init_cb = radix4_init,
.flm_destroy_cb = radix4_destroy,
.flm_dump_end_cb = radix4_end_dump,
.flm_change_rib_item_cb = radix4_change_cb,
.flm_get_pref = radix4_get_pref,
};
static void
fib4_algo_init(void)
{
fib_module_register(&flm_radix4_lockless);
fib_module_register(&flm_radix4);
}
SYSINIT(fib4_algo_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, fib4_algo_init, NULL);