diff options
Diffstat (limited to 'networking/libiproute/iproute.c')
-rw-r--r-- | networking/libiproute/iproute.c | 674 |
1 files changed, 674 insertions, 0 deletions
diff --git a/networking/libiproute/iproute.c b/networking/libiproute/iproute.c new file mode 100644 index 0000000..e38abcd --- /dev/null +++ b/networking/libiproute/iproute.c @@ -0,0 +1,674 @@ +/* + * iproute.c "ip route". + * + * 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. + * + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + * + * + * Changes: + * + * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses + * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <syslog.h> +#include <fcntl.h> +#include <string.h> +#include <sys/time.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <netinet/ip.h> +#include <arpa/inet.h> +#include <linux/in_route.h> + +#include "rt_names.h" +#include "utils.h" +#include "ip_common.h" + +#include "busybox.h" + +#ifndef RTAX_RTTVAR +#define RTAX_RTTVAR RTAX_HOPS +#endif + + +static struct +{ + int tb; + int flushp; + int flushe; + struct rtnl_handle *rth; + int protocol, protocolmask; + int scope, scopemask; + int type, typemask; + int tos, tosmask; + int iif, iifmask; + int oif, oifmask; + int realm, realmmask; + inet_prefix rprefsrc; + inet_prefix rvia; + inet_prefix rdst; + inet_prefix mdst; + inet_prefix rsrc; + inet_prefix msrc; +} filter; + +int print_route(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) +{ + FILE *fp = (FILE*)arg; + struct rtmsg *r = NLMSG_DATA(n); + int len = n->nlmsg_len; + struct rtattr * tb[RTA_MAX+1]; + char abuf[256]; + int host_len = -1; + SPRINT_BUF(b1); + + + if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) { + fprintf(stderr, "Not a route: %08x %08x %08x\n", + n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags); + return 0; + } + len -= NLMSG_LENGTH(sizeof(*r)); + if (len < 0) { + fprintf(stderr, "BUG: wrong nlmsg len %d\n", len); + return -1; + } + + if (r->rtm_family == AF_INET6) + host_len = 128; + else if (r->rtm_family == AF_INET) + host_len = 32; + + if (r->rtm_family == AF_INET6) { + if (filter.tb) { + if (filter.tb < 0) { + if (!(r->rtm_flags&RTM_F_CLONED)) + return 0; + } else { + if (r->rtm_flags&RTM_F_CLONED) + return 0; + if (filter.tb == RT_TABLE_LOCAL) { + if (r->rtm_type != RTN_LOCAL) + return 0; + } else if (filter.tb == RT_TABLE_MAIN) { + if (r->rtm_type == RTN_LOCAL) + return 0; + } else { + return 0; + } + } + } + } else { + if (filter.tb > 0 && filter.tb != r->rtm_table) + return 0; + } + if (filter.rdst.family && + (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) + return 0; + if (filter.mdst.family && + (r->rtm_family != filter.mdst.family || + (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) + return 0; + if (filter.rsrc.family && + (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) + return 0; + if (filter.msrc.family && + (r->rtm_family != filter.msrc.family || + (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) + return 0; + + memset(tb, 0, sizeof(tb)); + parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); + + if (n->nlmsg_type == RTM_DELROUTE) + fprintf(fp, "Deleted "); + if (r->rtm_type != RTN_UNICAST && !filter.type) + fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1))); + + if (tb[RTA_DST]) { + if (r->rtm_dst_len != host_len) { + fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family, + RTA_PAYLOAD(tb[RTA_DST]), + RTA_DATA(tb[RTA_DST]), + abuf, sizeof(abuf)), + r->rtm_dst_len + ); + } else { + fprintf(fp, "%s ", format_host(r->rtm_family, + RTA_PAYLOAD(tb[RTA_DST]), + RTA_DATA(tb[RTA_DST]), + abuf, sizeof(abuf)) + ); + } + } else if (r->rtm_dst_len) { + fprintf(fp, "0/%d ", r->rtm_dst_len); + } else { + fprintf(fp, "default "); + } + if (tb[RTA_SRC]) { + if (r->rtm_src_len != host_len) { + fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family, + RTA_PAYLOAD(tb[RTA_SRC]), + RTA_DATA(tb[RTA_SRC]), + abuf, sizeof(abuf)), + r->rtm_src_len + ); + } else { + fprintf(fp, "from %s ", format_host(r->rtm_family, + RTA_PAYLOAD(tb[RTA_SRC]), + RTA_DATA(tb[RTA_SRC]), + abuf, sizeof(abuf)) + ); + } + } else if (r->rtm_src_len) { + fprintf(fp, "from 0/%u ", r->rtm_src_len); + } + if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) { + fprintf(fp, "via %s ", + format_host(r->rtm_family, + RTA_PAYLOAD(tb[RTA_GATEWAY]), + RTA_DATA(tb[RTA_GATEWAY]), + abuf, sizeof(abuf))); + } + if (tb[RTA_OIF] && filter.oifmask != -1) + fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF]))); + + if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) { + /* Do not use format_host(). It is our local addr + and symbolic name will not be useful. + */ + fprintf(fp, " src %s ", + rt_addr_n2a(r->rtm_family, + RTA_PAYLOAD(tb[RTA_PREFSRC]), + RTA_DATA(tb[RTA_PREFSRC]), + abuf, sizeof(abuf))); + } + if (tb[RTA_PRIORITY]) + fprintf(fp, " metric %d ", *(__u32*)RTA_DATA(tb[RTA_PRIORITY])); + if (r->rtm_family == AF_INET6) { + struct rta_cacheinfo *ci = NULL; + if (tb[RTA_CACHEINFO]) + ci = RTA_DATA(tb[RTA_CACHEINFO]); + if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) { + static int hz; + if (!hz) + hz = get_hz(); + if (r->rtm_flags & RTM_F_CLONED) + fprintf(fp, "%s cache ", _SL_); + if (ci->rta_expires) + fprintf(fp, " expires %dsec", ci->rta_expires/hz); + if (ci->rta_error != 0) + fprintf(fp, " error %d", ci->rta_error); + } else if (ci) { + if (ci->rta_error != 0) + fprintf(fp, " error %d", ci->rta_error); + } + } + if (tb[RTA_IIF] && filter.iifmask != -1) { + fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF]))); + } + fprintf(fp, "\n"); + fflush(fp); + return 0; +} + +int iproute_modify(int cmd, unsigned flags, int argc, char **argv) +{ + struct rtnl_handle rth; + struct { + struct nlmsghdr n; + struct rtmsg r; + char buf[1024]; + } req; + char mxbuf[256]; + struct rtattr * mxrta = (void*)mxbuf; + unsigned mxlock = 0; + char *d = NULL; + int gw_ok = 0; + int dst_ok = 0; + //int nhs_ok = 0; + //int scope_ok = 0; + //int table_ok = 0; + int proto_ok = 0; + int type_ok = 0; + + memset(&req, 0, sizeof(req)); + + req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); + req.n.nlmsg_flags = NLM_F_REQUEST|flags; + req.n.nlmsg_type = cmd; + req.r.rtm_family = preferred_family; + req.r.rtm_table = RT_TABLE_MAIN; + req.r.rtm_scope = RT_SCOPE_NOWHERE; + + if (cmd != RTM_DELROUTE) { + req.r.rtm_protocol = RTPROT_BOOT; + req.r.rtm_scope = RT_SCOPE_UNIVERSE; + req.r.rtm_type = RTN_UNICAST; + } + + mxrta->rta_type = RTA_METRICS; + mxrta->rta_len = RTA_LENGTH(0); + + while (argc > 0) { + if (strcmp(*argv, "src") == 0) { + inet_prefix addr; + NEXT_ARG(); + get_addr(&addr, *argv, req.r.rtm_family); + if (req.r.rtm_family == AF_UNSPEC) + req.r.rtm_family = addr.family; + addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen); + } else if (strcmp(*argv, "via") == 0) { + inet_prefix addr; + gw_ok = 1; + NEXT_ARG(); + get_addr(&addr, *argv, req.r.rtm_family); + if (req.r.rtm_family == AF_UNSPEC) + req.r.rtm_family = addr.family; + addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen); + } else if (strcmp(*argv, "mtu") == 0) { + unsigned mtu; + NEXT_ARG(); + if (strcmp(*argv, "lock") == 0) { + mxlock |= (1<<RTAX_MTU); + NEXT_ARG(); + } + if (get_unsigned(&mtu, *argv, 0)) + invarg("\"mtu\" value is invalid\n", *argv); + rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu); + } else if (matches(*argv, "protocol") == 0) { + int prot; + NEXT_ARG(); + if (rtnl_rtprot_a2n(&prot, *argv)) + invarg("\"protocol\" value is invalid\n", *argv); + req.r.rtm_protocol = prot; + proto_ok =1; + } else if (strcmp(*argv, "dev") == 0 || + strcmp(*argv, "oif") == 0) { + NEXT_ARG(); + d = *argv; + } else { + int type; + inet_prefix dst; + + if (strcmp(*argv, "to") == 0) { + NEXT_ARG(); + } + if ((**argv < '0' || **argv > '9') && + rtnl_rtntype_a2n(&type, *argv) == 0) { + NEXT_ARG(); + req.r.rtm_type = type; + type_ok = 1; + } + + if (dst_ok) + duparg2("to", *argv); + get_prefix(&dst, *argv, req.r.rtm_family); + if (req.r.rtm_family == AF_UNSPEC) + req.r.rtm_family = dst.family; + req.r.rtm_dst_len = dst.bitlen; + dst_ok = 1; + if (dst.bytelen) + addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen); + } + argc--; argv++; + } + + if (rtnl_open(&rth, 0) < 0) + exit(1); + + if (mxrta->rta_len > RTA_LENGTH(0)) { + if (mxlock) + rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock); + addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta)); + } + + if (req.r.rtm_family == AF_UNSPEC) + req.r.rtm_family = AF_INET; + + if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) + exit(2); + + return 0; +} + +static int rtnl_rtcache_request(struct rtnl_handle *rth, int family) +{ + struct { + struct nlmsghdr nlh; + struct rtmsg rtm; + } req; + struct sockaddr_nl nladdr; + + memset(&nladdr, 0, sizeof(nladdr)); + memset(&req, 0, sizeof(req)); + nladdr.nl_family = AF_NETLINK; + + req.nlh.nlmsg_len = sizeof(req); + req.nlh.nlmsg_type = RTM_GETROUTE; + req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST; + req.nlh.nlmsg_pid = 0; + req.nlh.nlmsg_seq = rth->dump = ++rth->seq; + req.rtm.rtm_family = family; + req.rtm.rtm_flags |= RTM_F_CLONED; + + return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr)); +} + +static int iproute_list(int argc, char **argv) +{ + int do_ipv6 = preferred_family; + struct rtnl_handle rth; + char *id = NULL; + char *od = NULL; + + iproute_reset_filter(); + filter.tb = RT_TABLE_MAIN; + + while (argc > 0) { + if (matches(*argv, "protocol") == 0) { + int prot = 0; + NEXT_ARG(); + filter.protocolmask = -1; + if (rtnl_rtprot_a2n(&prot, *argv)) { + if (strcmp(*argv, "all") != 0) + invarg("invalid \"protocol\"\n", *argv); + prot = 0; + filter.protocolmask = 0; + } + filter.protocol = prot; + } else if (strcmp(*argv, "dev") == 0 || + strcmp(*argv, "oif") == 0) { + NEXT_ARG(); + od = *argv; + } else if (strcmp(*argv, "iif") == 0) { + NEXT_ARG(); + id = *argv; + } else if (matches(*argv, "from") == 0) { + NEXT_ARG(); + if (matches(*argv, "root") == 0) { + NEXT_ARG(); + get_prefix(&filter.rsrc, *argv, do_ipv6); + } else if (matches(*argv, "match") == 0) { + NEXT_ARG(); + get_prefix(&filter.msrc, *argv, do_ipv6); + } else { + if (matches(*argv, "exact") == 0) { + NEXT_ARG(); + } + get_prefix(&filter.msrc, *argv, do_ipv6); + filter.rsrc = filter.msrc; + } + } else { + if (matches(*argv, "to") == 0) { + NEXT_ARG(); + } + if (matches(*argv, "root") == 0) { + NEXT_ARG(); + get_prefix(&filter.rdst, *argv, do_ipv6); + } else if (matches(*argv, "match") == 0) { + NEXT_ARG(); + get_prefix(&filter.mdst, *argv, do_ipv6); + } else { + if (matches(*argv, "exact") == 0) { + NEXT_ARG(); + } + get_prefix(&filter.mdst, *argv, do_ipv6); + filter.rdst = filter.mdst; + } + } + argc--; argv++; + } + + if (do_ipv6 == AF_UNSPEC && filter.tb) + do_ipv6 = AF_INET; + + if (rtnl_open(&rth, 0) < 0) + exit(1); + + ll_init_map(&rth); + + if (id || od) { + int idx; + + if (id) { + if ((idx = ll_name_to_index(id)) == 0) { + fprintf(stderr, "Cannot find device \"%s\"\n", id); + return -1; + } + filter.iif = idx; + filter.iifmask = -1; + } + if (od) { + if ((idx = ll_name_to_index(od)) == 0) { + fprintf(stderr, "Cannot find device \"%s\"\n", od); + return -1; + } + filter.oif = idx; + filter.oifmask = -1; + } + } + + if (filter.tb != -1) { + if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) { + perror("Cannot send dump request"); + exit(1); + } + } else { + if (rtnl_rtcache_request(&rth, do_ipv6) < 0) { + perror("Cannot send dump request"); + exit(1); + } + } + + if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) { + fprintf(stderr, "Dump terminated\n"); + exit(1); + } + + exit(0); +} + + +int iproute_get(int argc, char **argv) +{ + struct rtnl_handle rth; + struct { + struct nlmsghdr n; + struct rtmsg r; + char buf[1024]; + } req; + char *idev = NULL; + char *odev = NULL; + int connected = 0; + int from_ok = 0; + + memset(&req, 0, sizeof(req)); + + iproute_reset_filter(); + + req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); + req.n.nlmsg_flags = NLM_F_REQUEST; + req.n.nlmsg_type = RTM_GETROUTE; + req.r.rtm_family = preferred_family; + req.r.rtm_table = 0; + req.r.rtm_protocol = 0; + req.r.rtm_scope = 0; + req.r.rtm_type = 0; + req.r.rtm_src_len = 0; + req.r.rtm_dst_len = 0; + req.r.rtm_tos = 0; + + while (argc > 0) { + if (matches(*argv, "from") == 0) { + inet_prefix addr; + NEXT_ARG(); + from_ok = 1; + get_prefix(&addr, *argv, req.r.rtm_family); + if (req.r.rtm_family == AF_UNSPEC) + req.r.rtm_family = addr.family; + if (addr.bytelen) + addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen); + req.r.rtm_src_len = addr.bitlen; + } else if (matches(*argv, "iif") == 0) { + NEXT_ARG(); + idev = *argv; + } else if (matches(*argv, "oif") == 0 || + strcmp(*argv, "dev") == 0) { + NEXT_ARG(); + odev = *argv; + } else if (matches(*argv, "notify") == 0) { + req.r.rtm_flags |= RTM_F_NOTIFY; + } else if (matches(*argv, "connected") == 0) { + connected = 1; + } else { + inet_prefix addr; + if (strcmp(*argv, "to") == 0) { + NEXT_ARG(); + } + get_prefix(&addr, *argv, req.r.rtm_family); + if (req.r.rtm_family == AF_UNSPEC) + req.r.rtm_family = addr.family; + if (addr.bytelen) + addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen); + req.r.rtm_dst_len = addr.bitlen; + } + argc--; argv++; + } + + if (req.r.rtm_dst_len == 0) { + fprintf(stderr, "need at least destination address\n"); + exit(1); + } + + if (rtnl_open(&rth, 0) < 0) + exit(1); + + ll_init_map(&rth); + + if (idev || odev) { + int idx; + + if (idev) { + if ((idx = ll_name_to_index(idev)) == 0) { + fprintf(stderr, "Cannot find device \"%s\"\n", idev); + return -1; + } + addattr32(&req.n, sizeof(req), RTA_IIF, idx); + } + if (odev) { + if ((idx = ll_name_to_index(odev)) == 0) { + fprintf(stderr, "Cannot find device \"%s\"\n", odev); + return -1; + } + addattr32(&req.n, sizeof(req), RTA_OIF, idx); + } + } + + if (req.r.rtm_family == AF_UNSPEC) + req.r.rtm_family = AF_INET; + + if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) + exit(2); + + if (connected && !from_ok) { + struct rtmsg *r = NLMSG_DATA(&req.n); + int len = req.n.nlmsg_len; + struct rtattr * tb[RTA_MAX+1]; + + if (print_route(NULL, &req.n, (void*)stdout) < 0) { + fprintf(stderr, "An error :-)\n"); + exit(1); + } + + if (req.n.nlmsg_type != RTM_NEWROUTE) { + fprintf(stderr, "Not a route?\n"); + return -1; + } + len -= NLMSG_LENGTH(sizeof(*r)); + if (len < 0) { + fprintf(stderr, "Wrong len %d\n", len); + return -1; + } + + memset(tb, 0, sizeof(tb)); + parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); + + if (tb[RTA_PREFSRC]) { + tb[RTA_PREFSRC]->rta_type = RTA_SRC; + r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]); + } else if (!tb[RTA_SRC]) { + fprintf(stderr, "Failed to connect the route\n"); + return -1; + } + if (!odev && tb[RTA_OIF]) + tb[RTA_OIF]->rta_type = 0; + if (tb[RTA_GATEWAY]) + tb[RTA_GATEWAY]->rta_type = 0; + if (!idev && tb[RTA_IIF]) + tb[RTA_IIF]->rta_type = 0; + req.n.nlmsg_flags = NLM_F_REQUEST; + req.n.nlmsg_type = RTM_GETROUTE; + + if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) + exit(2); + } + + if (print_route(NULL, &req.n, (void*)stdout) < 0) { + fprintf(stderr, "An error :-)\n"); + exit(1); + } + + exit(0); +} + +void iproute_reset_filter() +{ + memset(&filter, 0, sizeof(filter)); + filter.mdst.bitlen = -1; + filter.msrc.bitlen = -1; +} + +int do_iproute(int argc, char **argv) +{ + if (argc < 1) + return iproute_list(0, NULL); + + if (matches(*argv, "add") == 0) + return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL, + argc-1, argv+1); + if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0) + return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE, + argc-1, argv+1); + if (matches(*argv, "replace") == 0) + return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE, + argc-1, argv+1); + if (matches(*argv, "prepend") == 0) + return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE, + argc-1, argv+1); + if (matches(*argv, "append") == 0) + return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND, + argc-1, argv+1); + if (matches(*argv, "test") == 0) + return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL, + argc-1, argv+1); + if (matches(*argv, "delete") == 0) + return iproute_modify(RTM_DELROUTE, 0, + argc-1, argv+1); + if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0 + || matches(*argv, "lst") == 0) + return iproute_list(argc-1, argv+1); + if (matches(*argv, "get") == 0) + return iproute_get(argc-1, argv+1); + fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv); + exit(-1); +} + |