+++ /dev/null
-/*
- test_optimal_pmtu.c -- Execution of specific meshlink black box test cases
- Copyright (C) 2019 Guus Sliepen <guus@meshlink.io>
-
- 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.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#include "network_namespace_framework.h"
-
-#define DEFAULT_PUB_NET_ADDR "203.0.113.0/24"
-#define DEFAULT_GATEWAY_NET_ADDR "203.0.113.254"
-#define NS_PEER0 " ns_peer0 "
-#define NS_ETH0 " ns_eth0 "
-#define PEER_INDEX i ? 0 : 1
-#define get_namespace_handle_by_index(state_ptr, index) index < state_ptr->num_namespaces ? &(state_ptr->namespaces[index]) : NULL
-#define get_interface_handle_by_index(namespace, index) index < namespace->interfaces_no ? &((namespace->interfaces)[index]) : NULL
-
-static int ipv4_str_check_cidr(const char *ip_addr) {
- int cidr = 0;
- sscanf(ip_addr, "%*d.%*d.%*d.%*d/%d", &cidr);
- return cidr;
-}
-
-static char *ipv4_str_remove_cidr(const char *ipv4_addr) {
- char *ptr = strdup(ipv4_addr);
- assert(ptr);
-
- if(ipv4_str_check_cidr(ptr)) {
- char *end = strchr(ptr, '/');
- *end = '\0';
- }
-
- return ptr;
-}
-
-namespace_t *find_namespace(netns_state_t *state, const char *namespace_name) {
- int i;
-
- for(i = 0; i < state->num_namespaces; i++) {
- if(!strcmp((state->namespaces[i]).name, namespace_name)) {
- return &(state->namespaces[i]);
- }
- }
-
- return NULL;
-}
-
-static int netns_delete_namespace(namespace_t *namespace_handle) {
- char cmd[200];
-
- if(namespace_handle->type != BRIDGE) {
- assert(sprintf(cmd, "ip netns del %s 2>/dev/null", namespace_handle->name) >= 0);
- } else {
- assert(sprintf(cmd, "ip link del %s 2>/dev/null", namespace_handle->name) >= 0);
- }
-
- return system(cmd);
-}
-
-/* Create new network namespace using namespace handle */
-static void netns_create_namespace(netns_state_t *test_state, namespace_t *namespace_handle) {
- (void)test_state;
-
- char cmd[200];
-
- // Add the network namespace
-
- sprintf(cmd, "ip netns add %s", namespace_handle->name);
- assert(system(cmd) == 0);
-
- sprintf(cmd, "ip netns exec %s ip link set dev lo up", namespace_handle->name);
- assert(system(cmd) == 0);
-}
-
-static void netns_create_bridge(netns_state_t *test_state, namespace_t *namespace_handle) {
- (void)test_state;
-
- char cmd[200];
-
- sprintf(cmd, "ip link add name %s type bridge", namespace_handle->name);
- assert(system(cmd) == 0);
-
- sprintf(cmd, "ip link set %s up", namespace_handle->name);
- assert(system(cmd) == 0);
-}
-
-interface_t *get_peer_interface_handle(netns_state_t *test_state, namespace_t *namespace, namespace_t *peer_namespace) {
- (void)test_state;
-
- int i;
- interface_t *interfaces = namespace->interfaces;
- int if_no = namespace->interfaces_no;
- char *peer_name = peer_namespace->name;
-
- for(i = 0; i < if_no; i++) {
- if(!strcasecmp(interfaces[i].if_peer, peer_name)) {
- return &interfaces[i];
- }
- }
-
- return NULL;
-}
-
-interface_t *get_interface_handle_by_name(netns_state_t *test_state, namespace_t *namespace, const char *peer_name) {
- namespace_t *peer_ns;
- peer_ns = find_namespace(test_state, peer_name);
- assert(peer_ns);
-
- return get_peer_interface_handle(test_state, namespace, peer_ns);
-}
-
-bool check_interfaces_visited(netns_state_t *test_state, namespace_t *ns1, namespace_t *ns2) {
- interface_t *iface, *peer_iface;
- iface = get_peer_interface_handle(test_state, ns1, ns2);
- peer_iface = get_peer_interface_handle(test_state, ns2, ns1);
- assert(iface && peer_iface);
-
- return iface->priv || peer_iface->priv;
-}
-
-void netns_connect_namespaces(netns_state_t *test_state, namespace_t *ns1, namespace_t *ns2) {
- char buff[20], cmd[200];
- int i;
- char eth_pairs[2][20];
- namespace_t *ns[2] = { ns1, ns2 };
- interface_t *interface;
- char *set = "set";
-
- // Check if visited already
- if(check_interfaces_visited(test_state, ns1, ns2)) {
- return;
- }
-
- assert(sprintf(eth_pairs[0], "%.9s_eth0", ns2->name) >= 0);
- assert(sprintf(eth_pairs[1], "%.9s_peer0", ns1->name) >= 0);
-
- // Delete veth pair if already exists
- for(i = 0; i < 2; i++) {
- assert(sprintf(cmd, "ip link del %s 2>/dev/null", eth_pairs[i]) >= 0);
- system(cmd);
- }
-
- // Create veth pair
- assert(sprintf(cmd, "ip link add %s type veth peer name %s", eth_pairs[0], eth_pairs[1]) >= 0);
- assert(system(cmd) == 0);
-
- for(i = 0; i < 2; i++) {
-
- // Find interface handle that with it's peer interface
- interface = get_peer_interface_handle(test_state, ns[i], ns[PEER_INDEX]);
- assert(interface);
-
- if(ns[i]->type != BRIDGE) {
-
- // Define interface name
- char *if_name;
-
- if(interface->if_name) {
- if_name = interface->if_name;
- } else {
- assert(sprintf(buff, "eth_%s", interface->if_peer) >= 0);
- if_name = buff;
- }
-
- interface->if_name = strdup(if_name);
-
- assert(interface->if_name);
-
- // Connect one end of the the veth pair to the namespace's interface
- assert(sprintf(cmd, "ip link set %s netns %s name %s", eth_pairs[i], ns[i]->name, interface->if_name) >= 0);
-
- assert(system(cmd) == 0);
- } else {
-
- // Connect one end of the the veth pair to the bridge
- assert(sprintf(cmd, "ip link set %s master %s up\n", eth_pairs[i], ns[i]->name) >= 0);
- assert(system(cmd) == 0);
- }
-
- // Mark interfaces as connected
- interface->priv = set;
- interface = get_peer_interface_handle(test_state, ns[PEER_INDEX], ns[i]);
- assert(interface);
- interface->priv = set;
- }
-}
-
-void netns_configure_ip_address(netns_state_t *test_state) {
- int i, if_no;
- namespace_t *namespace;
- interface_t *if_handle;
- char cmd[200];
-
- for(i = 0; i < test_state->num_namespaces; i++) {
- namespace = get_namespace_handle_by_index(test_state, i);
-
- for(if_no = 0; if_no < namespace->interfaces_no; if_no++) {
- if_handle = get_interface_handle_by_index(namespace, if_no);
- assert(if_handle);
-
- if(if_handle->if_addr && namespace->type != BRIDGE) {
- assert(sprintf(cmd, "ip netns exec %s ip addr add %s dev %s", namespace->name, if_handle->if_addr, if_handle->if_name) >= 0);
- assert(system(cmd) == 0);
- assert(sprintf(cmd, "ip netns exec %s ip link set dev %s up", namespace->name, if_handle->if_name) >= 0);
- assert(system(cmd) == 0);
-
- if(if_handle->if_default_route_ip) {
- char *route_ip = ipv4_str_remove_cidr(if_handle->if_default_route_ip);
- assert(sprintf(cmd, "ip netns exec %s ip route add default via %s", namespace->name, route_ip) >= 0);
- assert(system(cmd) == 0);
- free(route_ip);
- }
- }
- }
- }
-}
-
-void netns_enable_all_nats(netns_state_t *test_state) {
- int i, j;
- namespace_t *namespace, *peer_namespace;
- interface_t *interface_handle;
- char cmd[200];
- char *ip_addr;
-
- for(i = 0; i < test_state->num_namespaces; i++) {
- namespace = get_namespace_handle_by_index(test_state, i);
-
- if(namespace->type == FULL_CONE) {
- assert(namespace->nat_arg);
- netns_fullcone_handle_t **nat_rules = namespace->nat_arg;
- char *eth0;
-
- for(j = 0; nat_rules[j]; j++) {
- assert(nat_rules[j]->snat_to_source && nat_rules[j]->dnat_to_destination);
-
- interface_handle = get_interface_handle_by_name(test_state, namespace, nat_rules[j]->snat_to_source);
- assert(interface_handle);
- eth0 = interface_handle->if_name;
- ip_addr = ipv4_str_remove_cidr(interface_handle->if_addr);
- assert(sprintf(cmd, "ip netns exec %s iptables -t nat -A POSTROUTING -o %s -j SNAT --to-source %s", namespace->name, eth0, ip_addr) >= 0);
- assert(system(cmd) == 0);
- free(ip_addr);
-
- peer_namespace = find_namespace(test_state, nat_rules[j]->dnat_to_destination);
- interface_handle = get_interface_handle_by_name(test_state, peer_namespace, namespace->name);
- assert(interface_handle);
-
- ip_addr = ipv4_str_remove_cidr(interface_handle->if_addr);
- assert(sprintf(cmd, "ip netns exec %s iptables -t nat -A PREROUTING -i %s -j DNAT --to-destination %s", namespace->name, eth0, ip_addr) >= 0);
- assert(system(cmd) == 0);
- free(ip_addr);
- }
- }
- }
-}
-
-void netns_create_all_namespaces(netns_state_t *test_state) {
- int i;
- namespace_t *namespace;
-
- for(i = 0; i < test_state->num_namespaces; i++) {
- namespace = get_namespace_handle_by_index(test_state, i);
-
- // Delete the namespace if already exists
- netns_delete_namespace(namespace);
-
- // Create namespace
-
- if(namespace->type != BRIDGE) {
- netns_create_namespace(test_state, namespace);
- } else {
- netns_create_bridge(test_state, namespace);
- }
- }
-}
-
-void netns_connect_all_namespaces(netns_state_t *test_state) {
- int i, j;
- namespace_t *namespace, *peer_namespace;
- interface_t *interfaces;
- interface_t *interface_handle;
-
- for(i = 0; i < test_state->num_namespaces; i++) {
- namespace = get_namespace_handle_by_index(test_state, i);
- assert(namespace->interfaces);
- interfaces = namespace->interfaces;
-
- for(j = 0; j < namespace->interfaces_no; j++) {
- peer_namespace = find_namespace(test_state, interfaces[j].if_peer);
- assert(peer_namespace);
- netns_connect_namespaces(test_state, namespace, peer_namespace);
- }
- }
-
- // Reset all priv members of the interfaces
-
- for(i = 0; i < test_state->num_namespaces; i++) {
- namespace = get_namespace_handle_by_index(test_state, i);
- assert(namespace->interfaces);
-
- for(j = 0; j < namespace->interfaces_no; j++) {
- interface_handle = get_interface_handle_by_index(namespace, j);
- assert(interface_handle);
- interface_handle->priv = NULL;
- }
- }
-}
-
-void increment_ipv4_str(char *ip_addr, int ip_addr_size) {
- uint32_t addr_int_n, addr_int_h;
-
- assert(inet_pton(AF_INET, ip_addr, &addr_int_n) > 0);
- addr_int_h = ntohl(addr_int_n);
- addr_int_h = addr_int_h + 1;
- addr_int_n = htonl(addr_int_h);
- assert(inet_ntop(AF_INET, &addr_int_n, ip_addr, ip_addr_size));
-}
-
-void increment_ipv4_cidr_str(char *ip) {
- int subnet;
- assert(sscanf(ip, "%*d.%*d.%*d.%*d/%d", &subnet) >= 0);
- char *ptr = strchr(ip, '/');
- *ptr = '\0';
- increment_ipv4_str(ip, INET6_ADDRSTRLEN);
- sprintf(ip + strlen(ip), "/%d", subnet);
-}
-
-interface_t *netns_get_priv_addr(netns_state_t *test_state, const char *namespace_name) {
- namespace_t *namespace_handle;
- interface_t *interface_handle;
- int if_no;
-
- namespace_handle = find_namespace(test_state, namespace_name);
- assert(namespace_handle);
-
- for(if_no = 0; if_no < namespace_handle->interfaces_no; if_no++) {
- interface_handle = get_interface_handle_by_index(namespace_handle, if_no);
-
- if(!strcmp(namespace_handle->name, interface_handle->fetch_ip_netns_name)) {
- return interface_handle;
- }
- }
-
- return NULL;
-}
-
-void netns_add_default_route_addr(netns_state_t *test_state) {
- int ns, if_no;
- namespace_t *namespace_handle;
- interface_t *interface_handle, *peer_interface_handle;
-
- for(ns = 0; ns < test_state->num_namespaces; ns++) {
- namespace_handle = get_namespace_handle_by_index(test_state, ns);
- assert(namespace_handle);
-
- if(namespace_handle->type != HOST) {
- continue;
- }
-
- for(if_no = 0; if_no < namespace_handle->interfaces_no; if_no++) {
- interface_handle = get_interface_handle_by_index(namespace_handle, if_no);
-
- if(interface_handle->if_default_route_ip == NULL) {
- peer_interface_handle = netns_get_priv_addr(test_state, interface_handle->fetch_ip_netns_name);
- assert(peer_interface_handle);
- interface_handle->if_default_route_ip = ipv4_str_remove_cidr(peer_interface_handle->if_addr);
- } else {
- char *dup = strdup(interface_handle->if_default_route_ip);
- assert(dup);
- interface_handle->if_default_route_ip = dup;
- }
- }
- }
-}
-
-void netns_assign_ip_addresses(netns_state_t *test_state) {
- int ns, j;
- namespace_t *namespace_handle;
- interface_t *interface_handle;
-
- char *addr = malloc(INET6_ADDRSTRLEN);
- assert(addr);
-
- if(test_state->public_net_addr) {
- assert(strncpy(addr, test_state->public_net_addr, INET6_ADDRSTRLEN));
- } else {
- assert(strncpy(addr, DEFAULT_PUB_NET_ADDR, INET6_ADDRSTRLEN));
- }
-
- test_state->public_net_addr = addr;
-
- for(ns = 0; ns < test_state->num_namespaces; ns++) {
- namespace_handle = get_namespace_handle_by_index(test_state, ns);
- assert(namespace_handle);
-
- if(namespace_handle->type == BRIDGE) {
- continue;
- }
-
- for(j = 0; j < namespace_handle->interfaces_no; j++) {
- interface_handle = get_interface_handle_by_index(namespace_handle, j);
- assert(interface_handle);
-
- if(interface_handle->if_addr) {
- continue;
- }
-
- // If fetch ip net namespace name is given get IP address from it, else get a public IP address
-
- if(interface_handle->fetch_ip_netns_name) {
- namespace_t *gw_netns_handle = find_namespace(test_state, interface_handle->fetch_ip_netns_name);
- assert(gw_netns_handle);
- assert(gw_netns_handle->static_config_net_addr);
-
- increment_ipv4_cidr_str(gw_netns_handle->static_config_net_addr);
- interface_handle->if_addr = strdup(gw_netns_handle->static_config_net_addr);
- } else {
- increment_ipv4_cidr_str(test_state->public_net_addr);
- interface_handle->if_addr = strdup(test_state->public_net_addr);
-
- if(namespace_handle->type == HOST) {
- if(interface_handle->if_default_route_ip) {
- char *dup = strdup(interface_handle->if_default_route_ip);
- assert(dup);
- interface_handle->if_default_route_ip = dup;
- } else {
- interface_handle->if_default_route_ip = strdup(DEFAULT_GATEWAY_NET_ADDR);
- }
- }
- }
- }
- }
-
- netns_add_default_route_addr(test_state);
-}
-
-static void netns_namespace_init_pids(netns_state_t *test_state) {
- int if_no;
- namespace_t *namespace_handle;
-
- for(if_no = 0; if_no < test_state->num_namespaces; if_no++) {
- namespace_handle = get_namespace_handle_by_index(test_state, if_no);
- assert(namespace_handle);
- namespace_handle->pid_nos = 0;
- namespace_handle->pids = NULL;
- }
-}
-
-pid_t run_cmd_in_netns(netns_state_t *test_state, char *namespace_name, char *cmd_str) {
- pid_t pid;
- namespace_t *namespace_handle;
- char cmd[1000];
-
- assert(namespace_name && cmd_str);
- namespace_handle = find_namespace(test_state, namespace_name);
- assert(namespace_handle);
-
- if((pid = fork()) == 0) {
- assert(daemon(1, 0) != -1);
- assert(sprintf(cmd, "ip netns exec %s %s", namespace_name, cmd_str) >= 0);
- assert(system(cmd) == 0);
- exit(0);
- }
-
- pid_t *pid_ptr;
- pid_ptr = realloc(namespace_handle->pids, (namespace_handle->pid_nos + 1) * sizeof(pid_t));
- assert(pid_ptr);
- namespace_handle->pids = pid_ptr;
- (namespace_handle->pids)[namespace_handle->pid_nos] = pid;
- namespace_handle->pid_nos = namespace_handle->pid_nos + 1;
-
- return pid;
-}
-
-static void *pthread_fun(void *arg) {
- netns_thread_t *netns_arg = (netns_thread_t *)arg;
- char namespace_path[100];
- void *ret;
- assert(sprintf(namespace_path, "/var/run/netns/%s", netns_arg->namespace_name) >= 0);
- int fd = open(namespace_path, O_RDONLY);
- assert(fd != -1);
- assert(setns(fd, CLONE_NEWNET) != -1);
-
- ret = (netns_arg->netns_thread)(netns_arg->arg);
- pthread_detach(netns_arg->thread_handle);
- pthread_exit(ret);
-}
-
-void run_node_in_namespace_thread(netns_thread_t *netns_arg) {
- assert(netns_arg->namespace_name && netns_arg->netns_thread);
- assert(!pthread_create(&(netns_arg->thread_handle), NULL, pthread_fun, netns_arg));
-}
-
-void netns_destroy_topology(netns_state_t *test_state) {
- namespace_t *namespace_handle;
- interface_t *interface_handle;
- int if_no, j, i;
- pid_t pid, pid_ret;
-
- for(if_no = 0; if_no < test_state->num_namespaces; if_no++) {
- namespace_handle = get_namespace_handle_by_index(test_state, if_no);
- assert(namespace_handle->interfaces);
-
- for(i = 0; i < namespace_handle->pid_nos; i++) {
- pid = (namespace_handle->pids)[i];
- kill(pid, SIGINT);
- pid_ret = waitpid(pid, NULL, WNOHANG);
- assert(pid_ret != -1);
-
- if(pid_ret == 0) {
- fprintf(stderr, "pid: %d, is still running\n", pid);
- }
- }
-
- // Free interface name, interface address, interface default address etc.,
- // which are dynamically allocated and set the values to NULL
-
- for(j = 0; j < namespace_handle->interfaces_no; j++) {
- interface_handle = get_interface_handle_by_index(namespace_handle, j);
- assert(interface_handle);
-
- free(interface_handle->if_name);
- interface_handle->if_name = NULL;
- free(interface_handle->if_addr);
- interface_handle->if_addr = NULL;
- free(interface_handle->if_default_route_ip);
- interface_handle->if_default_route_ip = NULL;
- }
-
- // Delete namespace
- assert(netns_delete_namespace(namespace_handle) == 0);
- }
-
- free(test_state->public_net_addr);
- test_state->public_net_addr = NULL;
-}
-
-bool netns_create_topology(netns_state_t *test_state) {
-
- // (Re)create name-spaces and bridges
- netns_create_all_namespaces(test_state);
-
- // Connect namespaces and bridges(if any) with their interfaces
- netns_connect_all_namespaces(test_state);
-
- // Assign IP addresses for the interfaces in namespaces
- netns_assign_ip_addresses(test_state);
-
- // Configure assigned IP addresses with the interfaces in netns
- netns_configure_ip_address(test_state);
-
- // Enable all NATs
- netns_enable_all_nats(test_state);
-
- netns_namespace_init_pids(test_state);
-
- return true;
-}
projects / meshlink-tiny / blobdiff