examples/ipsec-secgw/sp4.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016 Intel Corporation
 */

/*
 * Security Policies
 */
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip.h>

#include <rte_acl.h>
#include <rte_ip.h>

#include "ipsec.h"
#include "parser.h"

#define MAX_ACL_RULE_NUM        1024

/*
 * Rule and trace formats definitions.
 */
enum {
        PROTO_FIELD_IPV4,
        SRC_FIELD_IPV4,
        DST_FIELD_IPV4,
        SRCP_FIELD_IPV4,
        DSTP_FIELD_IPV4,
        NUM_FIELDS_IPV4
};

/*
 * That effectively defines order of IPV4 classifications:
 *  - PROTO
 *  - SRC IP ADDRESS
 *  - DST IP ADDRESS
 *  - PORTS (SRC and DST)
 */
enum {
        RTE_ACL_IPV4_PROTO,
        RTE_ACL_IPV4_SRC,
        RTE_ACL_IPV4_DST,
        RTE_ACL_IPV4_PORTS,
        RTE_ACL_IPV4_NUM
};

struct rte_acl_field_def ip4_defs[NUM_FIELDS_IPV4] = {
        {
        .type = RTE_ACL_FIELD_TYPE_BITMASK,
        .size = sizeof(uint8_t),
        .field_index = PROTO_FIELD_IPV4,
        .input_index = RTE_ACL_IPV4_PROTO,
        .offset = 0,
        },
        {
        .type = RTE_ACL_FIELD_TYPE_MASK,
        .size = sizeof(uint32_t),
        .field_index = SRC_FIELD_IPV4,
        .input_index = RTE_ACL_IPV4_SRC,
        .offset = offsetof(struct ip, ip_src) - offsetof(struct ip, ip_p)
        },
        {
        .type = RTE_ACL_FIELD_TYPE_MASK,
        .size = sizeof(uint32_t),
        .field_index = DST_FIELD_IPV4,
        .input_index = RTE_ACL_IPV4_DST,
        .offset = offsetof(struct ip, ip_dst) - offsetof(struct ip, ip_p)
        },
        {
        .type = RTE_ACL_FIELD_TYPE_RANGE,
        .size = sizeof(uint16_t),
        .field_index = SRCP_FIELD_IPV4,
        .input_index = RTE_ACL_IPV4_PORTS,
        .offset = sizeof(struct ip) - offsetof(struct ip, ip_p)
        },
        {
        .type = RTE_ACL_FIELD_TYPE_RANGE,
        .size = sizeof(uint16_t),
        .field_index = DSTP_FIELD_IPV4,
        .input_index = RTE_ACL_IPV4_PORTS,
        .offset = sizeof(struct ip) - offsetof(struct ip, ip_p) +
                sizeof(uint16_t)
        },
};

RTE_ACL_RULE_DEF(acl4_rules, RTE_DIM(ip4_defs));

struct acl4_rules acl4_rules_out[MAX_ACL_RULE_NUM];
uint32_t nb_acl4_rules_out;

struct acl4_rules acl4_rules_in[MAX_ACL_RULE_NUM];
uint32_t nb_acl4_rules_in;

void
parse_sp4_tokens(char **tokens, uint32_t n_tokens,
        struct parse_status *status)
{
        struct acl4_rules *rule_ipv4 = NULL;

        uint32_t *ri = NULL; /* rule index */
        uint32_t ti = 0; /* token index */

        uint32_t esp_p = 0;
        uint32_t protect_p = 0;
        uint32_t bypass_p = 0;
        uint32_t discard_p = 0;
        uint32_t pri_p = 0;
        uint32_t src_p = 0;
        uint32_t dst_p = 0;
        uint32_t proto_p = 0;
        uint32_t sport_p = 0;
        uint32_t dport_p = 0;

        if (strcmp(tokens[1], "in") == 0) {
                ri = &nb_acl4_rules_in;

                APP_CHECK(*ri <= MAX_ACL_RULE_NUM - 1, status,
                        "too many sp rules, abort insertion\n");
                if (status->status < 0)
                        return;

                rule_ipv4 = &acl4_rules_in[*ri];

        } else if (strcmp(tokens[1], "out") == 0) {
                ri = &nb_acl4_rules_out;

                APP_CHECK(*ri <= MAX_ACL_RULE_NUM - 1, status,
                        "too many sp rules, abort insertion\n");
                if (status->status < 0)
                        return;

                rule_ipv4 = &acl4_rules_out[*ri];
        } else {
                APP_CHECK(0, status, "unrecognized input \"%s\", expect"
                        " \"in\" or \"out\"\n", tokens[ti]);
                return;
        }

        rule_ipv4->data.category_mask = 1;

        for (ti = 2; ti < n_tokens; ti++) {
                if (strcmp(tokens[ti], "esp") == 0) {
                        /* currently do nothing */
                        APP_CHECK_PRESENCE(esp_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        esp_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "protect") == 0) {
                        APP_CHECK_PRESENCE(protect_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        APP_CHECK(bypass_p == 0, status, "conflict item "
                                "between \"%s\" and \"%s\"", tokens[ti],
                                "bypass");
                        if (status->status < 0)
                                return;
                        APP_CHECK(discard_p == 0, status, "conflict item "
                                "between \"%s\" and \"%s\"", tokens[ti],
                                "discard");
                        if (status->status < 0)
                                return;
                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;
                        APP_CHECK_TOKEN_IS_NUM(tokens, ti, status);
                        if (status->status < 0)
                                return;

                        rule_ipv4->data.userdata =
                                PROTECT(atoi(tokens[ti]));

                        protect_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "bypass") == 0) {
                        APP_CHECK_PRESENCE(bypass_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        APP_CHECK(protect_p == 0, status, "conflict item "
                                "between \"%s\" and \"%s\"", tokens[ti],
                                "protect");
                        if (status->status < 0)
                                return;
                        APP_CHECK(discard_p == 0, status, "conflict item "
                                "between \"%s\" and \"%s\"", tokens[ti],
                                "discard");
                        if (status->status < 0)
                                return;

                        rule_ipv4->data.userdata = BYPASS;

                        bypass_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "discard") == 0) {
                        APP_CHECK_PRESENCE(discard_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        APP_CHECK(protect_p == 0, status, "conflict item "
                                "between \"%s\" and \"%s\"", tokens[ti],
                                "protect");
                        if (status->status < 0)
                                return;
                        APP_CHECK(bypass_p == 0, status, "conflict item "
                                "between \"%s\" and \"%s\"", tokens[ti],
                                "discard");
                        if (status->status < 0)
                                return;

                        rule_ipv4->data.userdata = DISCARD;

                        discard_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "pri") == 0) {
                        APP_CHECK_PRESENCE(pri_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;
                        APP_CHECK_TOKEN_IS_NUM(tokens, ti, status);
                        if (status->status < 0)
                                return;

                        rule_ipv4->data.priority = atoi(tokens[ti]);

                        pri_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "src") == 0) {
                        struct in_addr ip;
                        uint32_t depth;

                        APP_CHECK_PRESENCE(src_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        APP_CHECK(parse_ipv4_addr(tokens[ti], &ip,
                                &depth) == 0, status, "unrecognized "
                                "input \"%s\", expect valid ipv4 addr",
                                tokens[ti]);
                        if (status->status < 0)
                                return;

                        rule_ipv4->field[1].value.u32 =
                                rte_bswap32(ip.s_addr);
                        rule_ipv4->field[1].mask_range.u32 =
                                depth;

                        src_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "dst") == 0) {
                        struct in_addr ip;
                        uint32_t depth;

                        APP_CHECK_PRESENCE(dst_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;
                        APP_CHECK(parse_ipv4_addr(tokens[ti], &ip,
                                &depth) == 0, status, "unrecognized "
                                "input \"%s\", expect valid ipv4 addr",
                                tokens[ti]);
                        if (status->status < 0)
                                return;

                        rule_ipv4->field[2].value.u32 =
                                rte_bswap32(ip.s_addr);
                        rule_ipv4->field[2].mask_range.u32 =
                                depth;

                        dst_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "proto") == 0) {
                        uint16_t low, high;

                        APP_CHECK_PRESENCE(proto_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        APP_CHECK(parse_range(tokens[ti], &low, &high)
                                == 0, status, "unrecognized input \"%s\""
                                ", expect \"from:to\"", tokens[ti]);
                        if (status->status < 0)
                                return;
                        APP_CHECK(low <= 0xff, status, "proto low "
                                "over-limit");
                        if (status->status < 0)
                                return;
                        APP_CHECK(high <= 0xff, status, "proto high "
                                "over-limit");
                        if (status->status < 0)
                                return;

                        rule_ipv4->field[0].value.u8 = (uint8_t)low;
                        rule_ipv4->field[0].mask_range.u8 = (uint8_t)high;

                        proto_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "sport") == 0) {
                        uint16_t port_low, port_high;

                        APP_CHECK_PRESENCE(sport_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        APP_CHECK(parse_range(tokens[ti], &port_low,
                                &port_high) == 0, status, "unrecognized "
                                "input \"%s\", expect \"port_from:"
                                "port_to\"", tokens[ti]);
                        if (status->status < 0)
                                return;

                        rule_ipv4->field[3].value.u16 = port_low;
                        rule_ipv4->field[3].mask_range.u16 = port_high;

                        sport_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "dport") == 0) {
                        uint16_t port_low, port_high;

                        APP_CHECK_PRESENCE(dport_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        APP_CHECK(parse_range(tokens[ti], &port_low,
                                &port_high) == 0, status, "unrecognized "
                                "input \"%s\", expect \"port_from:"
                                "port_to\"", tokens[ti]);
                        if (status->status < 0)
                                return;

                        rule_ipv4->field[4].value.u16 = port_low;
                        rule_ipv4->field[4].mask_range.u16 = port_high;

                        dport_p = 1;
                        continue;
                }

                /* unrecognizeable input */
                APP_CHECK(0, status, "unrecognized input \"%s\"",
                        tokens[ti]);
                return;
        }

        /* check if argument(s) are missing */
        APP_CHECK(esp_p == 1, status, "missing argument \"esp\"");
        if (status->status < 0)
                return;

        APP_CHECK(protect_p | bypass_p | discard_p, status, "missing "
                "argument \"protect\", \"bypass\", or \"discard\"");
        if (status->status < 0)
                return;

        *ri = *ri + 1;
}

static void
print_one_ip4_rule(const struct acl4_rules *rule, int32_t extra)
{
        uint8_t a, b, c, d;

        uint32_t_to_char(rule->field[SRC_FIELD_IPV4].value.u32,
                        &a, &b, &c, &d);
        printf("%hhu.%hhu.%hhu.%hhu/%u ", a, b, c, d,
                        rule->field[SRC_FIELD_IPV4].mask_range.u32);
        uint32_t_to_char(rule->field[DST_FIELD_IPV4].value.u32,
                        &a, &b, &c, &d);
        printf("%hhu.%hhu.%hhu.%hhu/%u ", a, b, c, d,
                        rule->field[DST_FIELD_IPV4].mask_range.u32);
        printf("%hu : %hu %hu : %hu 0x%hhx/0x%hhx ",
                rule->field[SRCP_FIELD_IPV4].value.u16,
                rule->field[SRCP_FIELD_IPV4].mask_range.u16,
                rule->field[DSTP_FIELD_IPV4].value.u16,
                rule->field[DSTP_FIELD_IPV4].mask_range.u16,
                rule->field[PROTO_FIELD_IPV4].value.u8,
                rule->field[PROTO_FIELD_IPV4].mask_range.u8);
        if (extra)
                printf("0x%x-0x%x-0x%x ",
                        rule->data.category_mask,
                        rule->data.priority,
                        rule->data.userdata);
}

static inline void
dump_ip4_rules(const struct acl4_rules *rule, int32_t num, int32_t extra)
{
        int32_t i;

        for (i = 0; i < num; i++, rule++) {
                printf("\t%d:", i + 1);
                print_one_ip4_rule(rule, extra);
                printf("\n");
        }
}

static struct rte_acl_ctx *
acl4_init(const char *name, int32_t socketid, const struct acl4_rules *rules,
                uint32_t rules_nb)
{
        char s[PATH_MAX];
        struct rte_acl_param acl_param;
        struct rte_acl_config acl_build_param;
        struct rte_acl_ctx *ctx;

        printf("Creating SP context with %u max rules\n", MAX_ACL_RULE_NUM);

        memset(&acl_param, 0, sizeof(acl_param));

        /* Create ACL contexts */
        snprintf(s, sizeof(s), "%s_%d", name, socketid);

        printf("IPv4 %s entries [%u]:\n", s, rules_nb);
        dump_ip4_rules(rules, rules_nb, 1);

        acl_param.name = s;
        acl_param.socket_id = socketid;
        acl_param.rule_size = RTE_ACL_RULE_SZ(RTE_DIM(ip4_defs));
        acl_param.max_rule_num = MAX_ACL_RULE_NUM;

        ctx = rte_acl_create(&acl_param);
        if (ctx == NULL)
                rte_exit(EXIT_FAILURE, "Failed to create ACL context\n");

        if (rte_acl_add_rules(ctx, (const struct rte_acl_rule *)rules,
                                rules_nb) < 0)
                rte_exit(EXIT_FAILURE, "add rules failed\n");

        /* Perform builds */
        memset(&acl_build_param, 0, sizeof(acl_build_param));

        acl_build_param.num_categories = DEFAULT_MAX_CATEGORIES;
        acl_build_param.num_fields = RTE_DIM(ip4_defs);
        memcpy(&acl_build_param.defs, ip4_defs, sizeof(ip4_defs));

        if (rte_acl_build(ctx, &acl_build_param) != 0)
                rte_exit(EXIT_FAILURE, "Failed to build ACL trie\n");

        rte_acl_dump(ctx);

        return ctx;
}

void
sp4_init(struct socket_ctx *ctx, int32_t socket_id)
{
        const char *name;

        if (ctx == NULL)
                rte_exit(EXIT_FAILURE, "NULL context.\n");

        if (ctx->sp_ip4_in != NULL)
                rte_exit(EXIT_FAILURE, "Inbound SP DB for socket %u already "
                                "initialized\n", socket_id);

        if (ctx->sp_ip4_out != NULL)
                rte_exit(EXIT_FAILURE, "Outbound SP DB for socket %u already "
                                "initialized\n", socket_id);

        if (nb_acl4_rules_in > 0) {
                name = "sp_ip4_in";
                ctx->sp_ip4_in = (struct sp_ctx *)acl4_init(name,
                        socket_id, acl4_rules_in, nb_acl4_rules_in);
        } else
                RTE_LOG(WARNING, IPSEC, "No IPv4 SP Inbound rule "
                        "specified\n");

        if (nb_acl4_rules_out > 0) {
                name = "sp_ip4_out";
                ctx->sp_ip4_out = (struct sp_ctx *)acl4_init(name,
                        socket_id, acl4_rules_out, nb_acl4_rules_out);
        } else
                RTE_LOG(WARNING, IPSEC, "No IPv4 SP Outbound rule "
                        "specified\n");
}