| /* |
| * Interface MIB architecture support |
| * |
| * $Id: ipv6scopezone_linux.c 14170 2007-04-29 02:22:12Z varun_c $ |
| */ |
| #include <net-snmp/net-snmp-config.h> |
| #include <net-snmp/net-snmp-includes.h> |
| |
| #include <net-snmp/agent/net-snmp-agent-includes.h> |
| #include <net-snmp/data_access/scopezone.h> |
| |
| #if defined (NETSNMP_ENABLE_IPV6) |
| static int _scopezone_v6(netsnmp_container* container, int idx_offset); |
| #endif |
| |
| /* |
| * |
| * @retval 0 success |
| * @retval -1 no container specified |
| * @retval -2 could not open file |
| * @retval -3 could not create entry (probably malloc) |
| * @retval -4 file format error |
| */ |
| int |
| netsnmp_access_scopezone_container_arch_load(netsnmp_container* container, |
| u_int load_flags) |
| { |
| int rc1 = 0, idx_offset = 0; |
| #if defined (NETSNMP_ENABLE_IPV6) |
| |
| if (NULL == container) { |
| snmp_log(LOG_ERR, "no container specified/found for access_scopezone_\n"); |
| return -1; |
| } |
| |
| rc1 = _scopezone_v6(container, idx_offset); |
| #endif |
| if(rc1 > 0) |
| rc1 = 0; |
| return rc1; |
| } |
| |
| #if defined (NETSNMP_ENABLE_IPV6) |
| |
| /* scope identifiers, from kernel - include/net/ipv6.h */ |
| #define IPV6_ADDR_LOOPBACK 0x0010U |
| #define IPV6_ADDR_LINKLOCAL 0x0020U |
| #define IPV6_ADDR_SITELOCAL 0x0040U |
| |
| static int |
| _scopezone_v6(netsnmp_container* container, int idx_offset) |
| { |
| |
| /* |
| * On Linux, we support only link-local scope zones. |
| * Each interface, which has link-local address, gets unique scope |
| * zone index. |
| */ |
| FILE *in; |
| char line[80], addr[40]; |
| int if_index, pfx_len, scope, flags, rc = 0; |
| int last_if_index = -1; |
| netsnmp_v6scopezone_entry *entry; |
| |
| netsnmp_assert(NULL != container); |
| |
| #define PROCFILE "/proc/net/if_inet6" |
| if (!(in = fopen(PROCFILE, "r"))) { |
| DEBUGMSGTL(("access:scopezone:container","could not open " PROCFILE "\n")); |
| return -2; |
| } |
| |
| /* |
| * address index prefix_len scope status if_name |
| */ |
| while (fgets(line, sizeof(line), in)) { |
| /* |
| * fe800000000000000200e8fffe5b5c93 05 40 20 80 eth0 |
| * A D P S F I |
| * A: address |
| * D: device number |
| * P: prefix len |
| * S: scope (see include/net/ipv6.h, net/ipv6/addrconf.c) |
| * F: flags (see include/linux/rtnetlink.h, net/ipv6/addrconf.c) |
| * I: interface |
| */ |
| rc = sscanf(line, "%39s %04x %02x %02x %02x\n", |
| addr, &if_index, &pfx_len, &scope, &flags); |
| if( 5 != rc ) { |
| snmp_log(LOG_ERR, PROCFILE " data format error (%d!=5), line ==|%s|\n", |
| rc, line); |
| continue; |
| } |
| DEBUGMSGTL(("access:scopezone:container", |
| "addr %s, index %d, pfx %d, scope %d, flags 0x%X\n", |
| addr, if_index, pfx_len, scope, flags)); |
| |
| if (! (scope & IPV6_ADDR_LINKLOCAL)) { |
| DEBUGMSGTL(("access:scopezone:container", |
| "The address is not link-local, skipping\n")); |
| continue; |
| } |
| /* |
| * Check that the interface was not inserted before, just in case |
| * one interface has two or more link-local addresses. |
| */ |
| if (last_if_index == if_index) { |
| DEBUGMSGTL(("access:scopezone:container", |
| "The interface was already inserted, skipping\n")); |
| continue; |
| } |
| |
| last_if_index = if_index; |
| entry = netsnmp_access_scopezone_entry_create(); |
| if(NULL == entry) { |
| rc = -3; |
| break; |
| } |
| entry->ns_scopezone_index = ++idx_offset; |
| entry->index = if_index; |
| entry->scopezone_linklocal = if_index; |
| |
| CONTAINER_INSERT(container, entry); |
| } |
| fclose(in); |
| if(rc<0) |
| return rc; |
| |
| return idx_offset; |
| } |
| #endif |
