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nameif: extended matching (Nico Erfurth <masta@perlgolf.de>)
*: whitespace fixes function old new delta prepend_new_eth_table - 304 +304 nameif_main 620 684 +64 cc_macaddr 51 - -51 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 1/0 up/down: 368/-51) Total: 317 bytes
This commit is contained in:
Denis Vlasenko
parent
fcfb5c04bb
commit
f7be20e70c
@ -549,6 +549,19 @@ config NAMEIF
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# Comment
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new_interface_name XX:XX:XX:XX:XX:XX
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config FEATURE_NAMEIF_EXTENDED
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bool "Extended nameif"
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default n
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depends on NAMEIF
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help
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This extends the nameif syntax to support the bus_info and driver
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checks. The syntax is compatible to the normal nameif.
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File format:
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new_interface_name driver=asix bus=usb-0000:00:08.2-3
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new_interface_name bus=usb-0000:00:08.2-3 00:80:C8:38:91:B5
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new_interface_name mac=00:80:C8:38:91:B5
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new_interface_name 00:80:C8:38:91:B5
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config NC
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bool "nc"
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default n
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@ -13,7 +13,7 @@
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#include <syslog.h>
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#include <net/if.h>
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#include <netinet/ether.h>
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#include <linux/sockios.h>
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/* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
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#ifndef IF_NAMESIZE
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@ -34,138 +34,214 @@
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#define ifr_newname ifr_ifru.ifru_slave
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#endif
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typedef struct mactable_s {
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struct mactable_s *next;
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struct mactable_s *prev;
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typedef struct ethtable_s {
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struct ethtable_s *next;
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struct ethtable_s *prev;
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char *ifname;
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struct ether_addr *mac;
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} mactable_t;
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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char *bus_info;
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char *driver;
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#endif
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} ethtable_t;
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/* Check ascii str_macaddr, convert and copy to *mac */
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static struct ether_addr *cc_macaddr(const char *str_macaddr)
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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/* Cut'n'paste from ethtool.h */
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#define ETHTOOL_BUSINFO_LEN 32
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/* these strings are set to whatever the driver author decides... */
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struct ethtool_drvinfo {
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__u32 cmd;
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char driver[32]; /* driver short name, "tulip", "eepro100" */
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char version[32]; /* driver version string */
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char fw_version[32]; /* firmware version string, if applicable */
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char bus_info[ETHTOOL_BUSINFO_LEN]; /* Bus info for this IF. */
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/* For PCI devices, use pci_dev->slot_name. */
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char reserved1[32];
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char reserved2[16];
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__u32 n_stats; /* number of u64's from ETHTOOL_GSTATS */
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__u32 testinfo_len;
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__u32 eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
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__u32 regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
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};
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#define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
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#endif
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static void nameif_parse_selector(ethtable_t *ch, char *selector)
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{
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struct ether_addr *lmac, *mac;
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struct ether_addr *lmac;
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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int found_selector = 0;
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lmac = ether_aton(str_macaddr);
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while (*selector) {
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char *next;
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#endif
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selector = skip_whitespace(selector);
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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if (*selector == '\0')
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break;
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/* Search for the end .... */
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next = skip_non_whitespace(selector);
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if (*next)
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*next++ = '\0';
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/* Check for selectors, mac= is assumed */
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if (strncmp(selector, "bus=", 4) == 0) {
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ch->bus_info = xstrdup(selector + 4);
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found_selector++;
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} else if (strncmp(selector, "driver=", 7) == 0) {
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ch->driver = xstrdup(selector + 7);
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found_selector++;
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} else {
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#endif
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lmac = ether_aton(selector + (strncmp(selector, "mac=", 4) == 0 ? 4 : 0));
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/* Check ascii selector, convert and copy to *mac */
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if (lmac == NULL)
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bb_error_msg_and_die("cannot parse MAC %s", str_macaddr);
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mac = xmalloc(ETH_ALEN);
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memcpy(mac, lmac, ETH_ALEN);
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bb_error_msg_and_die("cannot parse %s", selector);
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ch->mac = xmalloc(ETH_ALEN);
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memcpy(ch->mac, lmac, ETH_ALEN);
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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found_selector++;
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};
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selector = next;
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}
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if (found_selector == 0)
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bb_error_msg_and_die("no selectors found for %s", ch->ifname);
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#endif
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}
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return mac;
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static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
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{
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ethtable_t *ch;
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if (strlen(ifname) >= IF_NAMESIZE)
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bb_error_msg_and_die("interface name '%s' too long", ifname);
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ch = xzalloc(sizeof(*ch));
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ch->ifname = ifname;
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nameif_parse_selector(ch, selector);
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ch->next = *clist;
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if (*clist)
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(*clist)->prev = ch;
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*clist = ch;
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}
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int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nameif_main(int argc, char **argv)
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{
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mactable_t *clist = NULL;
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ethtable_t *clist = NULL;
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FILE *ifh;
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const char *fname = "/etc/mactab";
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char *line;
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char *line_ptr;
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int linenum;
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int ctl_sk;
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int if_index = 1;
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mactable_t *ch;
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ethtable_t *ch;
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if (1 & getopt32(argv, "sc:", &fname)) {
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openlog(applet_name, 0, LOG_LOCAL0);
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logmode = LOGMODE_SYSLOG;
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}
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argc -= optind;
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argv += optind;
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if ((argc - optind) & 1)
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if (argc & 1)
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bb_show_usage();
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if (optind < argc) {
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char **a = argv + optind;
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while (*a) {
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if (strlen(*a) > IF_NAMESIZE)
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bb_error_msg_and_die("interface name '%s' "
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"too long", *a);
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ch = xzalloc(sizeof(mactable_t));
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ch->ifname = xstrdup(*a++);
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ch->mac = cc_macaddr(*a++);
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if (clist)
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clist->prev = ch;
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ch->next = clist;
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clist = ch;
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if (argc) {
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while (*argv) {
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char *ifname = xstrdup(*argv++);
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prepend_new_eth_table(&clist, ifname, *argv++);
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}
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} else {
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ifh = xfopen(fname, "r");
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while ((line = xmalloc_fgets(ifh)) != NULL) {
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char *line_ptr;
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size_t name_length;
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char *next;
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line_ptr = line + strspn(line, " \t");
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line_ptr = skip_whitespace(line);
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if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) {
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free(line);
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continue;
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}
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name_length = strcspn(line_ptr, " \t");
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ch = xzalloc(sizeof(mactable_t));
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ch->ifname = xstrndup(line_ptr, name_length);
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if (name_length > IF_NAMESIZE)
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bb_error_msg_and_die("interface name '%s' "
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"too long", ch->ifname);
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line_ptr += name_length;
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line_ptr += strspn(line_ptr, " \t");
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name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:");
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line_ptr[name_length] = '\0';
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ch->mac = cc_macaddr(line_ptr);
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if (clist)
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clist->prev = ch;
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ch->next = clist;
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clist = ch;
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next = skip_non_whitespace(line_ptr);
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if (*next)
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*next++ = '\0';
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prepend_new_eth_table(&clist, line_ptr, next);
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free(line);
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}
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fclose(ifh);
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}
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ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
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ifh = xfopen("/proc/net/dev", "r");
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linenum = 0;
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while (clist) {
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struct ifreq ifr;
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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struct ethtool_drvinfo drvinfo;
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#endif
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line = xmalloc_fgets(ifh);
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if (line == NULL)
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break; /* Seems like we're done */
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if (linenum++ < 2 )
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goto next_line; /* Skip the first two lines */
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/* Find the current interface name and copy it to ifr.ifr_name */
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line_ptr = skip_whitespace(line);
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*skip_non_whitespace(line_ptr) = '\0';
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memset(&ifr, 0, sizeof(struct ifreq));
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if_index++;
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ifr.ifr_ifindex = if_index;
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strncpy(ifr.ifr_name, line_ptr, sizeof(ifr.ifr_name));
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/* Get ifname by index or die */
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if (ioctl(ctl_sk, SIOCGIFNAME, &ifr))
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break;
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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/* Check for driver etc. */
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memset(&drvinfo, 0, sizeof(struct ethtool_drvinfo));
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drvinfo.cmd = ETHTOOL_GDRVINFO;
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ifr.ifr_data = (caddr_t) &drvinfo;
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/* Get driver and businfo first, so we have it in drvinfo */
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ioctl(ctl_sk, SIOCETHTOOL, &ifr);
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#endif
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ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
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/* Has this device hwaddr? */
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if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr))
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/* Search the list for a matching device */
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for (ch = clist; ch; ch = ch->next) {
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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if (ch->bus_info && strcmp(ch->bus_info, drvinfo.bus_info) != 0)
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continue;
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/* Search for mac like in ifr.ifr_hwaddr.sa_data */
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for (ch = clist; ch; ch = ch->next)
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if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
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break;
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/* Nothing found for current ifr.ifr_hwaddr.sa_data */
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if (ch == NULL)
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if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
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continue;
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#endif
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if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
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continue;
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/* if we came here, all selectors have matched */
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goto found;
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}
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/* Nothing found for current interface */
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goto next_line;
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found:
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if (strcmp(ifr.ifr_name, ch->ifname) != 0) {
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strcpy(ifr.ifr_newname, ch->ifname);
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ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
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"cannot change ifname %s to %s",
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ifr.ifr_name, ch->ifname);
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/* Remove list entry of renamed interface */
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if (ch->prev != NULL) {
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(ch->prev)->next = ch->next;
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} else {
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clist = ch->next;
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}
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/* Remove list entry of renamed interface */
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if (ch->prev != NULL)
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ch->prev->next = ch->next;
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else
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clist = ch->next;
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if (ch->next != NULL)
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(ch->next)->prev = ch->prev;
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ch->next->prev = ch->prev;
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(ch->ifname);
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free(ch->mac);
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free(ch);
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}
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next_line:
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free(line);
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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fclose(ifh);
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};
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return 0;
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}
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