--- /dev/null
+/*
+ * (C) 2018 by Harsha Sharma <harshasharmaiitr@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+#include <libnftnl/cttimeout.h>
+
+#include "obj.h"
+
+static const char *const tcp_state_to_name[] = {
+ [NFTNL_CTTIMEOUT_TCP_SYN_SENT] = "SYN_SENT",
+ [NFTNL_CTTIMEOUT_TCP_SYN_RECV] = "SYN_RECV",
+ [NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = "ESTABLISHED",
+ [NFTNL_CTTIMEOUT_TCP_FIN_WAIT] = "FIN_WAIT",
+ [NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = "CLOSE_WAIT",
+ [NFTNL_CTTIMEOUT_TCP_LAST_ACK] = "LAST_ACK",
+ [NFTNL_CTTIMEOUT_TCP_TIME_WAIT] = "TIME_WAIT",
+ [NFTNL_CTTIMEOUT_TCP_CLOSE] = "CLOSE",
+ [NFTNL_CTTIMEOUT_TCP_SYN_SENT2] = "SYN_SENT2",
+ [NFTNL_CTTIMEOUT_TCP_RETRANS] = "RETRANS",
+ [NFTNL_CTTIMEOUT_TCP_UNACK] = "UNACKNOWLEDGED",
+};
+
+static uint32_t tcp_dflt_timeout[] = {
+ [NFTNL_CTTIMEOUT_TCP_SYN_SENT] = 120,
+ [NFTNL_CTTIMEOUT_TCP_SYN_RECV] = 60,
+ [NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = 432000,
+ [NFTNL_CTTIMEOUT_TCP_FIN_WAIT] = 120,
+ [NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = 60,
+ [NFTNL_CTTIMEOUT_TCP_LAST_ACK] = 30,
+ [NFTNL_CTTIMEOUT_TCP_TIME_WAIT] = 120,
+ [NFTNL_CTTIMEOUT_TCP_CLOSE] = 10,
+ [NFTNL_CTTIMEOUT_TCP_SYN_SENT2] = 120,
+ [NFTNL_CTTIMEOUT_TCP_RETRANS] = 300,
+ [NFTNL_CTTIMEOUT_TCP_UNACK] = 300,
+};
+
+static const char *const udp_state_to_name[] = {
+ [NFTNL_CTTIMEOUT_UDP_UNREPLIED] = "UNREPLIED",
+ [NFTNL_CTTIMEOUT_UDP_REPLIED] = "REPLIED",
+};
+
+static uint32_t udp_dflt_timeout[] = {
+ [NFTNL_CTTIMEOUT_UDP_UNREPLIED] = 30,
+ [NFTNL_CTTIMEOUT_UDP_REPLIED] = 180,
+};
+
+static struct {
+ uint32_t attr_max;
+ const char *const *state_to_name;
+ uint32_t *dflt_timeout;
+} timeout_protocol[IPPROTO_MAX] = {
+ [IPPROTO_TCP] = {
+ .attr_max = NFTNL_CTTIMEOUT_TCP_MAX,
+ .state_to_name = tcp_state_to_name,
+ .dflt_timeout = tcp_dflt_timeout,
+ },
+ [IPPROTO_UDP] = {
+ .attr_max = NFTNL_CTTIMEOUT_UDP_MAX,
+ .state_to_name = udp_state_to_name,
+ .dflt_timeout = udp_dflt_timeout,
+ },
+};
+
+struct _container_policy_cb {
+ unsigned int nlattr_max;
+ void *tb;
+};
+
+static int
+nftnl_timeout_policy_attr_set_u32(struct nftnl_obj *e,
+ uint32_t type, uint32_t data)
+{
+ struct nftnl_obj_ct_timeout *t = nftnl_obj_data(e);
+ size_t timeout_array_size;
+
+ /* Layer 4 protocol needs to be already set. */
+ if (!(e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO)))
+ return -1;
+ if (t->timeout == NULL) {
+ /* if not supported, default to generic protocol tracker. */
+ if (timeout_protocol[t->l4proto].attr_max != 0) {
+ timeout_array_size = sizeof(uint32_t) *
+ timeout_protocol[t->l4proto].attr_max;
+ } else {
+ timeout_array_size = sizeof(uint32_t) *
+ timeout_protocol[IPPROTO_RAW].attr_max;
+ }
+ t->timeout = calloc(1, timeout_array_size);
+ if (t->timeout == NULL)
+ return -1;
+ }
+
+ /* this state does not exists in this protocol tracker.*/
+ if (type > timeout_protocol[t->l4proto].attr_max)
+ return -1;
+
+ t->timeout[type] = data;
+
+ if (!(e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)))
+ e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY);
+
+ return 0;
+}
+
+static int
+parse_timeout_attr_policy_cb(const struct nlattr *attr, void *data)
+{
+ struct _container_policy_cb *data_cb = data;
+ const struct nlattr **tb = data_cb->tb;
+ uint16_t type = mnl_attr_get_type(attr);
+
+ if (mnl_attr_type_valid(attr, data_cb->nlattr_max) < 0)
+ return MNL_CB_OK;
+
+ if (type <= data_cb->nlattr_max) {
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ tb[type] = attr;
+ }
+ return MNL_CB_OK;
+}
+
+static void
+timeout_parse_attr_data(struct nftnl_obj *e,
+ const struct nlattr *nest)
+{
+ struct nftnl_obj_ct_timeout *t = nftnl_obj_data(e);
+ unsigned int attr_max = timeout_protocol[t->l4proto].attr_max;
+ struct nlattr *tb[attr_max];
+ struct _container_policy_cb cnt = {
+ .nlattr_max = attr_max,
+ .tb = tb,
+ };
+ unsigned int i;
+
+ memset(tb, 0, sizeof(struct nlattr *) * attr_max);
+
+ mnl_attr_parse_nested(nest, parse_timeout_attr_policy_cb, &cnt);
+
+ for (i = 1; i <= attr_max; i++) {
+ if (tb[i]) {
+ nftnl_timeout_policy_attr_set_u32(e, i-1,
+ ntohl(mnl_attr_get_u32(tb[i])));
+ }
+ }
+}
+
+static int nftnl_obj_ct_timeout_set(struct nftnl_obj *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+
+ switch (type) {
+ case NFTNL_OBJ_CT_TIMEOUT_L3PROTO:
+ timeout->l3proto = *((uint16_t *)data);
+ break;
+ case NFTNL_OBJ_CT_TIMEOUT_L4PROTO:
+ timeout->l4proto = *((uint8_t *)data);
+ break;
+ case NFTNL_OBJ_CT_TIMEOUT_ARRAY:
+ timeout->timeout = ((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *nftnl_obj_ct_timeout_get(const struct nftnl_obj *e,
+ uint16_t type, uint32_t *data_len)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+
+ switch (type) {
+ case NFTNL_OBJ_CT_TIMEOUT_L3PROTO:
+ *data_len = sizeof(timeout->l3proto);
+ return &timeout->l3proto;
+ case NFTNL_OBJ_CT_TIMEOUT_L4PROTO:
+ *data_len = sizeof(timeout->l4proto);
+ return &timeout->l4proto;
+ case NFTNL_OBJ_CT_TIMEOUT_ARRAY:
+ *data_len = sizeof(timeout->timeout);
+ return timeout->timeout;
+ }
+ return NULL;
+}
+
+static int nftnl_obj_ct_timeout_cb(const struct nlattr *attr, void *data)
+{
+ int type = mnl_attr_get_type(attr);
+ const struct nlattr **tb = data;
+
+ if (mnl_attr_type_valid(attr, NFTA_CT_TIMEOUT_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_CT_TIMEOUT_L3PROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_TIMEOUT_L4PROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_TIMEOUT_DATA:
+ if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_obj_ct_timeout_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+ struct nlattr *nest;
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO))
+ mnl_attr_put_u16(nlh, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3proto));
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO))
+ mnl_attr_put_u8(nlh, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto);
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)) {
+ nest = mnl_attr_nest_start(nlh, NFTA_CT_TIMEOUT_DATA);
+ for (int i = 0; i < timeout_protocol[timeout->l4proto].attr_max; i++) {
+ if (timeout->timeout[i])
+ mnl_attr_put_u32(nlh, i+1, htonl(timeout->timeout[i]));
+ }
+ mnl_attr_nest_end(nlh, nest);
+ }
+}
+
+static int
+nftnl_obj_ct_timeout_parse(struct nftnl_obj *e, struct nlattr *attr)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+ struct nlattr *tb[NFTA_CT_TIMEOUT_MAX + 1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_obj_ct_timeout_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_CT_TIMEOUT_L3PROTO]) {
+ timeout->l3proto = ntohs(mnl_attr_get_u16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
+ e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO);
+ }
+ if (tb[NFTA_CT_TIMEOUT_L4PROTO]) {
+ timeout->l4proto = mnl_attr_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
+ e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO);
+ }
+ if (tb[NFTA_CT_TIMEOUT_DATA]) {
+ timeout_parse_attr_data(e, tb[NFTA_CT_TIMEOUT_DATA]);
+ e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY);
+ }
+ return 0;
+}
+
+static int nftnl_obj_ct_timeout_export(char *buf, size_t size,
+ const struct nftnl_obj *e, int type)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+
+ NFTNL_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO))
+ nftnl_buf_u32(&b, type, timeout->l3proto, FAMILY);
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO))
+ nftnl_buf_u32(&b, type, timeout->l4proto, "service");
+
+ return nftnl_buf_done(&b);
+}
+
+static int nftnl_obj_ct_timeout_snprintf_default(char *buf, size_t len,
+ const struct nftnl_obj *e)
+{
+ int ret = 0;
+ int offset = 0, remain = len;
+
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO)) {
+ ret = snprintf(buf + offset, len, "family %d ",
+ timeout->l3proto);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO)) {
+ ret = snprintf(buf + offset, len, "protocol %d ",
+ timeout->l4proto);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)) {
+ uint8_t l4num = timeout->l4proto;
+ int i;
+
+ /* default to generic protocol tracker. */
+ if (timeout_protocol[timeout->l4proto].attr_max == 0)
+ l4num = IPPROTO_RAW;
+
+ ret = snprintf(buf + offset, len, "policy = {");
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+ for (i = 0; i < timeout_protocol[l4num].attr_max; i++) {
+ const char *state_name =
+ timeout_protocol[l4num].state_to_name[i][0] ?
+ timeout_protocol[l4num].state_to_name[i] :
+ "UNKNOWN";
+
+ if (timeout->timeout[i] != timeout_protocol[l4num].dflt_timeout[i]) {
+ ret = snprintf(buf + offset, len,
+ "%s = %u,", state_name, timeout->timeout[i]);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ }
+
+ ret = snprintf(buf + offset, len, "}");
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ buf[offset] = '\0';
+
+ return offset;
+}
+
+static int nftnl_obj_ct_timeout_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags,
+ const struct nftnl_obj *e)
+{
+ if (len)
+ buf[0] = '\0';
+
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_obj_ct_timeout_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_JSON:
+ return nftnl_obj_ct_timeout_export(buf, len, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+struct obj_ops obj_ops_ct_timeout = {
+ .name = "ct_timeout",
+ .type = NFT_OBJECT_CT_TIMEOUT,
+ .alloc_len = sizeof(struct nftnl_obj_ct_timeout),
+ .max_attr = NFTA_CT_TIMEOUT_MAX,
+ .set = nftnl_obj_ct_timeout_set,
+ .get = nftnl_obj_ct_timeout_get,
+ .parse = nftnl_obj_ct_timeout_parse,
+ .build = nftnl_obj_ct_timeout_build,
+ .snprintf = nftnl_obj_ct_timeout_snprintf,
+};
projects / thirdparty / libnftnl.git / commitdiff
