DPDK  22.11.0-rc4
examples/l3fwd/lpm_route_parse.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2022 Intel Corporation
*/
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <sys/socket.h>
#include "l3fwd.h"
#include "l3fwd_route.h"
enum {
CB_FLD_DST_ADDR,
CB_FLD_IF_OUT,
CB_FLD_MAX
};
struct lpm_route_rule *route_base_v4;
struct lpm_route_rule *route_base_v6;
int route_num_v4;
int route_num_v6;
/* Bypass comment and empty lines */
int
is_bypass_line(const char *buff)
{
int i = 0;
/* comment line */
if (buff[0] == COMMENT_LEAD_CHAR)
return 1;
/* empty line */
while (buff[i] != '\0') {
if (!isspace(buff[i]))
return 0;
i++;
}
return 1;
}
static int
parse_ipv6_addr_mask(char *token, uint32_t *ipv6, uint8_t *mask)
{
char *sa, *sm, *sv;
const char *dlm = "/";
sv = NULL;
sa = strtok_r(token, dlm, &sv);
if (sa == NULL)
return -EINVAL;
sm = strtok_r(NULL, dlm, &sv);
if (sm == NULL)
return -EINVAL;
if (inet_pton(AF_INET6, sa, ipv6) != 1)
return -EINVAL;
GET_CB_FIELD(sm, *mask, 0, 128, 0);
return 0;
}
static int
parse_ipv4_addr_mask(char *token, uint32_t *ipv4, uint8_t *mask)
{
char *sa, *sm, *sv;
const char *dlm = "/";
sv = NULL;
sa = strtok_r(token, dlm, &sv);
if (sa == NULL)
return -EINVAL;
sm = strtok_r(NULL, dlm, &sv);
if (sm == NULL)
return -EINVAL;
if (inet_pton(AF_INET, sa, ipv4) != 1)
return -EINVAL;
GET_CB_FIELD(sm, *mask, 0, 32, 0);
*ipv4 = ntohl(*ipv4);
return 0;
}
static int
lpm_parse_v6_net(char *in, uint32_t *v, uint8_t *mask_len)
{
int32_t rc;
/* get address. */
rc = parse_ipv6_addr_mask(in, v, mask_len);
return rc;
}
static int
lpm_parse_v6_rule(char *str, struct lpm_route_rule *v)
{
int i, rc;
char *s, *sp, *in[CB_FLD_MAX];
static const char *dlm = " \t\n";
int dim = CB_FLD_MAX;
s = str;
for (i = 0; i != dim; i++, s = NULL) {
in[i] = strtok_r(s, dlm, &sp);
if (in[i] == NULL)
return -EINVAL;
}
rc = lpm_parse_v6_net(in[CB_FLD_DST_ADDR], v->ip_32, &v->depth);
GET_CB_FIELD(in[CB_FLD_IF_OUT], v->if_out, 0, UINT8_MAX, 0);
return rc;
}
static int
lpm_parse_v4_rule(char *str, struct lpm_route_rule *v)
{
int i, rc;
char *s, *sp, *in[CB_FLD_MAX];
static const char *dlm = " \t\n";
int dim = CB_FLD_MAX;
s = str;
for (i = 0; i != dim; i++, s = NULL) {
in[i] = strtok_r(s, dlm, &sp);
if (in[i] == NULL)
return -EINVAL;
}
rc = parse_ipv4_addr_mask(in[CB_FLD_DST_ADDR], &v->ip, &v->depth);
GET_CB_FIELD(in[CB_FLD_IF_OUT], v->if_out, 0, UINT8_MAX, 0);
return rc;
}
static int
lpm_add_default_v4_rules(void)
{
/* populate the LPM IPv4 table */
unsigned int i, rule_size = sizeof(*route_base_v4);
route_num_v4 = RTE_DIM(ipv4_l3fwd_route_array);
route_base_v4 = calloc(route_num_v4, rule_size);
for (i = 0; i < (unsigned int)route_num_v4; i++) {
route_base_v4[i].ip = ipv4_l3fwd_route_array[i].ip;
route_base_v4[i].depth = ipv4_l3fwd_route_array[i].depth;
route_base_v4[i].if_out = ipv4_l3fwd_route_array[i].if_out;
}
return 0;
}
static int
lpm_add_default_v6_rules(void)
{
/* populate the LPM IPv6 table */
unsigned int i, rule_size = sizeof(*route_base_v6);
route_num_v6 = RTE_DIM(ipv6_l3fwd_route_array);
route_base_v6 = calloc(route_num_v6, rule_size);
for (i = 0; i < (unsigned int)route_num_v6; i++) {
memcpy(route_base_v6[i].ip_8, ipv6_l3fwd_route_array[i].ip,
sizeof(route_base_v6[i].ip_8));
route_base_v6[i].depth = ipv6_l3fwd_route_array[i].depth;
route_base_v6[i].if_out = ipv6_l3fwd_route_array[i].if_out;
}
return 0;
}
static int
lpm_add_rules(const char *rule_path,
struct lpm_route_rule **proute_base,
int (*parser)(char *, struct lpm_route_rule *))
{
struct lpm_route_rule *route_rules;
struct lpm_route_rule *next;
unsigned int route_num = 0;
unsigned int route_cnt = 0;
char buff[LINE_MAX];
FILE *fh;
unsigned int i = 0, rule_size = sizeof(*next);
int val;
*proute_base = NULL;
fh = fopen(rule_path, "rb");
if (fh == NULL)
return -EINVAL;
while ((fgets(buff, LINE_MAX, fh) != NULL)) {
if (buff[0] == ROUTE_LEAD_CHAR)
route_num++;
}
if (route_num == 0) {
fclose(fh);
return -EINVAL;
}
val = fseek(fh, 0, SEEK_SET);
if (val < 0) {
fclose(fh);
return -EINVAL;
}
route_rules = calloc(route_num, rule_size);
if (route_rules == NULL) {
fclose(fh);
return -EINVAL;
}
i = 0;
while (fgets(buff, LINE_MAX, fh) != NULL) {
i++;
if (is_bypass_line(buff))
continue;
char s = buff[0];
/* Route entry */
if (s == ROUTE_LEAD_CHAR)
next = &route_rules[route_cnt];
/* Illegal line */
else {
RTE_LOG(ERR, L3FWD,
"%s Line %u: should start with leading "
"char %c\n",
rule_path, i, ROUTE_LEAD_CHAR);
fclose(fh);
free(route_rules);
return -EINVAL;
}
if (parser(buff + 1, next) != 0) {
RTE_LOG(ERR, L3FWD,
"%s Line %u: parse rules error\n",
rule_path, i);
fclose(fh);
free(route_rules);
return -EINVAL;
}
route_cnt++;
}
fclose(fh);
*proute_base = route_rules;
return route_cnt;
}
void
lpm_free_routes(void)
{
free(route_base_v4);
free(route_base_v6);
route_base_v4 = NULL;
route_base_v6 = NULL;
route_num_v4 = 0;
route_num_v6 = 0;
}
/* Load rules from the input file */
void
read_config_files_lpm(void)
{
if (parm_config.rule_ipv4_name != NULL &&
parm_config.rule_ipv6_name != NULL) {
/* ipv4 check */
route_num_v4 = lpm_add_rules(parm_config.rule_ipv4_name,
&route_base_v4, &lpm_parse_v4_rule);
if (route_num_v4 < 0) {
lpm_free_routes();
rte_exit(EXIT_FAILURE, "Failed to add IPv4 rules\n");
}
/* ipv6 check */
route_num_v6 = lpm_add_rules(parm_config.rule_ipv6_name,
&route_base_v6, &lpm_parse_v6_rule);
if (route_num_v6 < 0) {
lpm_free_routes();
rte_exit(EXIT_FAILURE, "Failed to add IPv6 rules\n");
}
} else {
RTE_LOG(INFO, L3FWD, "Missing 1 or more rule files, using default instead\n");
if (lpm_add_default_v4_rules() < 0) {
lpm_free_routes();
rte_exit(EXIT_FAILURE, "Failed to add default IPv4 rules\n");
}
if (lpm_add_default_v6_rules() < 0) {
lpm_free_routes();
rte_exit(EXIT_FAILURE, "Failed to add default IPv6 rules\n");
}
}
}