diff options
Diffstat (limited to 'test/packetdrill/net_utils.c')
| -rw-r--r-- | test/packetdrill/net_utils.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/test/packetdrill/net_utils.c b/test/packetdrill/net_utils.c new file mode 100644 index 0000000..1b59d64 --- /dev/null +++ b/test/packetdrill/net_utils.c @@ -0,0 +1,172 @@ +/* + * Copyright 2013 Google Inc. + * + * 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. + */ +/* + * Author: ncardwell@google.com (Neal Cardwell) + * + * Implementation for various network utilities. + */ + +#include "net_utils.h" + +#include <stdlib.h> +#include <net/if.h> +#include <unistd.h> + +#include "logging.h" + +static void verbose_system(const char *command) +{ + int result; + + DEBUGP("running: '%s'\n", command); + result = system(command); + DEBUGP("result: %d\n", result); + if (result != 0) + DEBUGP("error executing command '%s'\n", command); +} + +/* Configure a local IPv4 address and netmask for the device */ +static void net_add_ipv4_address(const char *dev_name, + const struct ip_address *ip, + int prefix_len) +{ + char *command = NULL; + char ip_string[ADDR_STR_LEN]; + + ip_to_string(ip, ip_string); + +#ifdef linux + asprintf(&command, "ip addr add %s/%d dev %s > /dev/null 2>&1", + ip_string, prefix_len, dev_name); +#endif +#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) + asprintf(&command, "/sbin/ifconfig %s %s/%d alias", + dev_name, ip_string, prefix_len); +#endif /* defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) */ + + verbose_system(command); + free(command); +} + +/* Configure a local IPv6 address and prefix length for the device */ +static void net_add_ipv6_address(const char *dev_name, + const struct ip_address *ip, + int prefix_len) +{ + char *command = NULL; + char ip_string[ADDR_STR_LEN]; + + ip_to_string(ip, ip_string); + +#ifdef linux + + asprintf(&command, "ip addr add %s/%d dev %s > /dev/null 2>&1", + ip_string, prefix_len, dev_name); +#endif +#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) + + asprintf(&command, "/sbin/ifconfig %s inet6 %s/%d", + dev_name, ip_string, prefix_len); +#endif /* defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) */ + + verbose_system(command); + free(command); + + /* Wait for IPv6 duplicate address detection to converge, + * so that this address no longer shows as "tentative". + * e.g. "ip addr show" shows: + * inet6 fd3d:fa7b:d17d::36/48 scope global tentative + */ +#ifdef linux + if (!strstr(dev_name, "tun")) + sleep(2); +#endif +#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) + sleep(3); +#endif +} + +void net_add_dev_address(const char *dev_name, + const struct ip_address *ip, + int prefix_len) +{ + switch (ip->address_family) { + case AF_INET: + net_add_ipv4_address(dev_name, ip, prefix_len); + break; + case AF_INET6: + net_add_ipv6_address(dev_name, ip, prefix_len); + break; + default: + assert(!"bad family"); + break; + } +} + +void net_del_dev_address(const char *dev_name, + const struct ip_address *ip, + int prefix_len) +{ + char *command = NULL; + char ip_string[ADDR_STR_LEN]; + + ip_to_string(ip, ip_string); + +#ifdef linux + asprintf(&command, "ip addr del %s/%d dev %s > /dev/null 2>&1", + ip_string, prefix_len, dev_name); +#endif +#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) + asprintf(&command, "/sbin/ifconfig %s %s %s/%d -alias", + dev_name, + ip->address_family == AF_INET6 ? "inet6" : "", + ip_string, prefix_len); +#endif /* defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) */ + + verbose_system(command); + free(command); +} + +/* In general we want to avoid configuring a new IP address on an + * interface, because we do not want to pay the latency penaly + * (e.g. it takes about one second for IPv6 duplicate address + * detection). So if we find the IP configured the correct local + * network device, then we're done, and we short-circuit and return + * immediately. Otherwise remove the address from the current device + * and add it on the newly-requested device. + */ +void net_setup_dev_address(const char *dev_name, + const struct ip_address *ip, + int prefix_len) +{ + char cur_dev_name[IFNAMSIZ]; + + bool found = get_ip_device(ip, cur_dev_name); + + DEBUGP("net_setup_dev_address: found: %d\n", found); + + if (found && strcmp(cur_dev_name, dev_name) == 0) { + DEBUGP("net_setup_dev_address: found on correct device\n"); + return; + } + + if (found) + net_del_dev_address(cur_dev_name, ip, prefix_len); + net_add_dev_address(dev_name, ip, prefix_len); +} |