diff options
| -rw-r--r-- | networking/ifenslave.c | 183 |
1 files changed, 82 insertions, 101 deletions
diff --git a/networking/ifenslave.c b/networking/ifenslave.c index f3b4d7466..071cac722 100644 --- a/networking/ifenslave.c +++ b/networking/ifenslave.c @@ -116,7 +116,7 @@ struct dev_data { }; -enum { skfd = 3 }; /* AF_INET socket for ioctl() calls.*/ +enum { skfd = 3 }; /* AF_INET socket for ioctl() calls. */ struct globals { unsigned abi_ver; /* userland - kernel ABI version */ smallint hwaddr_set; /* Master's hwaddr is set */ @@ -136,12 +136,11 @@ struct globals { static void get_drv_info(char *master_ifname); static int get_if_settings(char *ifname, struct dev_data *dd); static int get_slave_flags(char *slave_ifname); -static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr); -static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr); -static int set_slave_mtu(char *slave_ifname, int mtu); -static int set_if_flags(char *ifname, short flags); -static int set_if_up(char *ifname, short flags); -static int set_if_down(char *ifname, short flags); +static int set_hwaddr(char *ifname, struct sockaddr *hwaddr); +static int set_mtu(char *ifname, int mtu); +static int set_if_flags(char *ifname, int flags); +static int set_if_up(char *ifname, int flags); +static int set_if_down(char *ifname, int flags); static int clear_if_addr(char *ifname); static int set_if_addr(char *master_ifname, char *slave_ifname); static void change_active(char *master_ifname, char *slave_ifname); @@ -153,6 +152,17 @@ static void strncpy_IFNAMSIZ(char *dst, const char *src) strncpy(dst, src, IFNAMSIZ); } +static int ioctl_on_skfd(unsigned request, struct ifreq *ifr) +{ + return ioctl(skfd, request, ifr); +} + +static int set_ifrname_and_do_ioctl(unsigned request, struct ifreq *ifr, const char *ifname) +{ + strncpy_IFNAMSIZ(ifr->ifr_name, ifname); + return ioctl_on_skfd(request, ifr); +} + int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv) { @@ -167,10 +177,10 @@ int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv) }; #if ENABLE_GETOPT_LONG static const char ifenslave_longopts[] ALIGN1 = - "change-active" No_argument "c" - "detach" No_argument "d" - "force" No_argument "f" - ; + "change-active\0" No_argument "c" + "detach\0" No_argument "d" + "force\0" No_argument "f" + ; applet_long_options = ifenslave_longopts; #endif @@ -181,10 +191,9 @@ int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv) if (opt & (opt-1)) /* options check */ bb_show_usage(); - /* Copy the interface name */ master_ifname = *argv++; - /* No remaining args means show all interfaces. */ + /* No interface names - show all interfaces. */ if (!master_ifname) { display_interfaces(NULL); return EXIT_SUCCESS; @@ -193,14 +202,16 @@ int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv) /* Open a basic socket */ xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), skfd); - /* exchange abi version with bonding module */ + /* Exchange abi version with bonding module */ get_drv_info(master_ifname); slave_ifname = *argv++; if (!slave_ifname) { if (opt & (OPT_d|OPT_c)) { - display_interfaces(slave_ifname); - return 2; /* why? */ + /* --change or --detach, and no slaves given - + * show all interfaces. */ + display_interfaces(slave_ifname /* == NULL */); + return 2; /* why 2? */ } /* A single arg means show the * configuration for this interface @@ -225,12 +236,11 @@ int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv) if (!(master.flags.ifr_flags & IFF_UP)) bb_error_msg_and_die("%s is not up", master_ifname); - /* Only for enslaving */ - if (!(opt & (OPT_c|OPT_d))) { - sa_family_t master_family = master.hwaddr.ifr_hwaddr.sa_family; - + /* No opts: neither -c[hange] nor -d[etach] -> it's "enslave" then; + * and -f[orce] is not there too */ + if (!opt) { /* The family '1' is ARPHRD_ETHER for ethernet. */ - if (master_family != 1 && !(opt & OPT_f)) { + if (master.hwaddr.ifr_hwaddr.sa_family != 1) { bb_error_msg_and_die( "%s is not ethernet-like (-f overrides)", master_ifname); @@ -240,8 +250,7 @@ int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv) /* Accepts only one slave */ if (opt & OPT_c) { /* change active slave */ - res = get_slave_flags(slave_ifname); - if (res) { + if (get_slave_flags(slave_ifname)) { bb_perror_msg_and_die( "%s: can't get flags", slave_ifname); } @@ -256,8 +265,8 @@ int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv) /* detach a slave interface from the master */ rv = get_slave_flags(slave_ifname); if (rv) { - /* Can't work with this slave. */ - /* remember the error and skip it*/ + /* Can't work with this slave, */ + /* remember the error and skip it */ bb_perror_msg( "skipping %s: can't get flags", slave_ifname); @@ -276,8 +285,8 @@ int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv) /* attach a slave interface to the master */ rv = get_if_settings(slave_ifname, &slave); if (rv) { - /* Can't work with this slave. */ - /* remember the error and skip it*/ + /* Can't work with this slave, */ + /* remember the error and skip it */ bb_perror_msg( "skipping %s: can't get settings", slave_ifname); @@ -308,14 +317,11 @@ static void get_drv_info(char *master_ifname) struct ethtool_drvinfo info; memset(&ifr, 0, sizeof(ifr)); - strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname); ifr.ifr_data = (caddr_t)&info; - info.cmd = ETHTOOL_GDRVINFO; strncpy(info.driver, "ifenslave", 32); snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION); - - if (ioctl(skfd, SIOCETHTOOL, &ifr) < 0) { + if (set_ifrname_and_do_ioctl(SIOCETHTOOL, &ifr, master_ifname) < 0) { if (errno == EOPNOTSUPP) return; bb_perror_msg_and_die("%s: SIOCETHTOOL error", master_ifname); @@ -324,8 +330,6 @@ static void get_drv_info(char *master_ifname) abi_ver = bb_strtou(info.fw_version, NULL, 0); if (errno) bb_error_msg_and_die("%s: SIOCETHTOOL error", master_ifname); - - return; } static void change_active(char *master_ifname, char *slave_ifname) @@ -338,10 +342,9 @@ static void change_active(char *master_ifname, char *slave_ifname) slave_ifname); } - strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname); strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); - if (ioctl(skfd, SIOCBONDCHANGEACTIVE, &ifr) < 0 - && ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &ifr) < 0 + if (set_ifrname_and_do_ioctl(SIOCBONDCHANGEACTIVE, &ifr, master_ifname) + && ioctl_on_skfd(BOND_CHANGE_ACTIVE_OLD, &ifr) ) { bb_perror_msg_and_die( "master %s, slave %s: can't " @@ -384,7 +387,7 @@ static int enslave(char *master_ifname, char *slave_ifname) } if (master.mtu.ifr_mtu != slave.mtu.ifr_mtu) { - res = set_slave_mtu(slave_ifname, master.mtu.ifr_mtu); + res = set_mtu(slave_ifname, master.mtu.ifr_mtu); if (res) { bb_perror_msg("%s: can't set MTU", slave_ifname); return res; @@ -400,9 +403,7 @@ static int enslave(char *master_ifname, char *slave_ifname) * the application sets the slave's * hwaddr */ - res = set_slave_hwaddr(slave_ifname, - &(master.hwaddr.ifr_hwaddr)); - if (res) { + if (set_hwaddr(slave_ifname, &(master.hwaddr.ifr_hwaddr))) { bb_perror_msg("%s: can't set hw address", slave_ifname); goto undo_mtu; @@ -411,8 +412,7 @@ static int enslave(char *master_ifname, char *slave_ifname) /* For old ABI the application needs to bring the * slave back up */ - res = set_if_up(slave_ifname, slave.flags.ifr_flags); - if (res) + if (set_if_up(slave_ifname, slave.flags.ifr_flags)) goto undo_slave_mac; } /* The driver is using a new ABI, @@ -428,14 +428,11 @@ static int enslave(char *master_ifname, char *slave_ifname) /* For old ABI, the master needs to be * down before setting it's hwaddr */ - res = set_if_down(master_ifname, master.flags.ifr_flags); - if (res) + if (set_if_down(master_ifname, master.flags.ifr_flags)) goto undo_mtu; } - res = set_master_hwaddr(master_ifname, - &(slave.hwaddr.ifr_hwaddr)); - if (res) { + if (set_hwaddr(master_ifname, &(slave.hwaddr.ifr_hwaddr))) { bb_error_msg("%s: can't set hw address", master_ifname); goto undo_mtu; @@ -445,8 +442,7 @@ static int enslave(char *master_ifname, char *slave_ifname) /* For old ABI, bring the master * back up */ - res = set_if_up(master_ifname, master.flags.ifr_flags); - if (res) + if (set_if_up(master_ifname, master.flags.ifr_flags)) goto undo_master_mac; } @@ -454,29 +450,26 @@ static int enslave(char *master_ifname, char *slave_ifname) } /* Do the real thing */ - strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname); strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); - if (ioctl(skfd, SIOCBONDENSLAVE, &ifr) < 0 - && ioctl(skfd, BOND_ENSLAVE_OLD, &ifr) < 0 + if (set_ifrname_and_do_ioctl(SIOCBONDENSLAVE, &ifr, master_ifname) + && ioctl_on_skfd(BOND_ENSLAVE_OLD, &ifr) ) { - res = 1; - } - - if (res) goto undo_master_mac; + } return 0; /* rollback (best effort) */ undo_master_mac: - set_master_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr)); + set_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr)); hwaddr_set = 0; goto undo_mtu; + undo_slave_mac: - set_slave_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr)); + set_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr)); undo_mtu: - set_slave_mtu(slave_ifname, slave.mtu.ifr_mtu); - return res; + set_mtu(slave_ifname, slave.mtu.ifr_mtu); + return 1; } static int release(char *master_ifname, char *slave_ifname) @@ -490,10 +483,9 @@ static int release(char *master_ifname, char *slave_ifname) return 1; } - strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname); strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); - if (ioctl(skfd, SIOCBONDRELEASE, &ifr) < 0 - && ioctl(skfd, BOND_RELEASE_OLD, &ifr) < 0 + if (set_ifrname_and_do_ioctl(SIOCBONDRELEASE, &ifr, master_ifname) < 0 + && ioctl_on_skfd(BOND_RELEASE_OLD, &ifr) < 0 ) { return 1; } @@ -505,7 +497,7 @@ static int release(char *master_ifname, char *slave_ifname) } /* set to default mtu */ - set_slave_mtu(slave_ifname, 1500); + set_mtu(slave_ifname, 1500); return res; } @@ -514,59 +506,43 @@ static int get_if_settings(char *ifname, struct dev_data *dd) { int res; - strncpy_IFNAMSIZ(dd->mtu.ifr_name, ifname); - res = ioctl(skfd, SIOCGIFMTU, &dd->mtu); - strncpy_IFNAMSIZ(dd->flags.ifr_name, ifname); - res |= ioctl(skfd, SIOCGIFFLAGS, &dd->flags); - strncpy_IFNAMSIZ(dd->hwaddr.ifr_name, ifname); - res |= ioctl(skfd, SIOCGIFHWADDR, &dd->hwaddr); + res = set_ifrname_and_do_ioctl(SIOCGIFMTU, &dd->mtu, ifname); + res |= set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &dd->flags, ifname); + res |= set_ifrname_and_do_ioctl(SIOCGIFHWADDR, &dd->hwaddr, ifname); return res; } static int get_slave_flags(char *slave_ifname) { - strncpy_IFNAMSIZ(slave.flags.ifr_name, slave_ifname); - return ioctl(skfd, SIOCGIFFLAGS, &slave.flags); + return set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &slave.flags, slave_ifname); } -static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr) +static int set_hwaddr(char *ifname, struct sockaddr *hwaddr) { struct ifreq ifr; - strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname); - memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr)); - return ioctl(skfd, SIOCSIFHWADDR, &ifr); + memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(*hwaddr)); + return set_ifrname_and_do_ioctl(SIOCSIFHWADDR, &ifr, ifname); } -static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr) -{ - struct ifreq ifr; - - strncpy_IFNAMSIZ(ifr.ifr_name, slave_ifname); - memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr)); - return ioctl(skfd, SIOCSIFHWADDR, &ifr); -} - -static int set_slave_mtu(char *slave_ifname, int mtu) +static int set_mtu(char *ifname, int mtu) { struct ifreq ifr; ifr.ifr_mtu = mtu; - strncpy_IFNAMSIZ(ifr.ifr_name, slave_ifname); - return ioctl(skfd, SIOCSIFMTU, &ifr); + return set_ifrname_and_do_ioctl(SIOCSIFMTU, &ifr, ifname); } -static int set_if_flags(char *ifname, short flags) +static int set_if_flags(char *ifname, int flags) { struct ifreq ifr; ifr.ifr_flags = flags; - strncpy_IFNAMSIZ(ifr.ifr_name, ifname); - return ioctl(skfd, SIOCSIFFLAGS, &ifr); + return set_ifrname_and_do_ioctl(SIOCSIFFLAGS, &ifr, ifname); } -static int set_if_up(char *ifname, short flags) +static int set_if_up(char *ifname, int flags) { int res = set_if_flags(ifname, flags | IFF_UP); if (res) @@ -574,7 +550,7 @@ static int set_if_up(char *ifname, short flags) return res; } -static int set_if_down(char *ifname, short flags) +static int set_if_down(char *ifname, int flags) { int res = set_if_flags(ifname, flags & ~IFF_UP); if (res) @@ -586,17 +562,24 @@ static int clear_if_addr(char *ifname) { struct ifreq ifr; - strncpy_IFNAMSIZ(ifr.ifr_name, ifname); ifr.ifr_addr.sa_family = AF_INET; memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data)); - return ioctl(skfd, SIOCSIFADDR, &ifr); + return set_ifrname_and_do_ioctl(SIOCSIFADDR, &ifr, ifname); } static int set_if_addr(char *master_ifname, char *slave_ifname) { +#if (SIOCGIFADDR | SIOCSIFADDR \ + | SIOCGIFDSTADDR | SIOCSIFDSTADDR \ + | SIOCGIFBRDADDR | SIOCSIFBRDADDR \ + | SIOCGIFNETMASK | SIOCSIFNETMASK) <= 0xffff +#define INT uint16_t +#else +#define INT int +#endif static const struct { - int g_ioctl; - int s_ioctl; + INT g_ioctl; + INT s_ioctl; } ifra[] = { { SIOCGIFADDR, SIOCSIFADDR }, { SIOCGIFDSTADDR, SIOCSIFDSTADDR }, @@ -609,16 +592,14 @@ static int set_if_addr(char *master_ifname, char *slave_ifname) unsigned i; for (i = 0; i < ARRAY_SIZE(ifra); i++) { - strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname); - res = ioctl(skfd, ifra[i].g_ioctl, &ifr); + res = set_ifrname_and_do_ioctl(ifra[i].g_ioctl, &ifr, master_ifname); if (res < 0) { ifr.ifr_addr.sa_family = AF_INET; memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data)); } - strncpy_IFNAMSIZ(ifr.ifr_name, slave_ifname); - res = ioctl(skfd, ifra[i].s_ioctl, &ifr); + res = set_ifrname_and_do_ioctl(ifra[i].s_ioctl, &ifr, slave_ifname); if (res < 0) return res; } |