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ip rule: add selector support
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
This commit is contained in:
Hangbin Liu
Stephen Hemminger
parent
cb294a1de6
commit
ca89c52143
180
ip/iprule.c
180
ip/iprule.c
@ -20,6 +20,7 @@
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <linux/if.h>
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#include <linux/fib_rules.h>
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#include <errno.h>
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@ -41,7 +42,7 @@ static void usage(void)
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{
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fprintf(stderr, "Usage: ip rule { add | del } SELECTOR ACTION\n");
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fprintf(stderr, " ip rule { flush | save | restore }\n");
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fprintf(stderr, " ip rule [ list ]\n");
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fprintf(stderr, " ip rule [ list [ SELECTOR ]]\n");
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fprintf(stderr, "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n");
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fprintf(stderr, " [ iif STRING ] [ oif STRING ] [ pref NUMBER ] [ l3mdev ]\n");
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fprintf(stderr, "ACTION := [ table TABLE_ID ]\n");
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@ -55,6 +56,105 @@ static void usage(void)
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exit(-1);
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}
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static struct
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{
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int not;
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int l3mdev;
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int iifmask, oifmask;
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unsigned int tb;
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unsigned int tos, tosmask;
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unsigned int pref, prefmask;
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unsigned int fwmark, fwmask;
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char iif[IFNAMSIZ];
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char oif[IFNAMSIZ];
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inet_prefix src;
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inet_prefix dst;
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} filter;
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static bool filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
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{
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struct rtmsg *r = NLMSG_DATA(n);
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inet_prefix src = { .family = r->rtm_family };
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inet_prefix dst = { .family = r->rtm_family };
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__u32 table;
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if (preferred_family != AF_UNSPEC && r->rtm_family != preferred_family)
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return false;
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if (filter.prefmask &&
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filter.pref ^ (tb[FRA_PRIORITY] ? rta_getattr_u32(tb[FRA_PRIORITY]) : 0))
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return false;
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if (filter.not && !(r->rtm_flags & FIB_RULE_INVERT))
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return false;
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if (filter.src.family) {
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if (tb[FRA_SRC]) {
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memcpy(&src.data, RTA_DATA(tb[FRA_SRC]),
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(r->rtm_src_len + 7) / 8);
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}
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if (filter.src.family != r->rtm_family ||
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filter.src.bitlen > r->rtm_src_len ||
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inet_addr_match(&src, &filter.src, filter.src.bitlen))
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return false;
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}
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if (filter.dst.family) {
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if (tb[FRA_DST]) {
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memcpy(&dst.data, RTA_DATA(tb[FRA_DST]),
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(r->rtm_dst_len + 7) / 8);
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}
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if (filter.dst.family != r->rtm_family ||
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filter.dst.bitlen > r->rtm_dst_len ||
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inet_addr_match(&dst, &filter.dst, filter.dst.bitlen))
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return false;
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}
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if (filter.tosmask && filter.tos ^ r->rtm_tos)
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return false;
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if (filter.fwmark) {
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__u32 mark = 0;
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if (tb[FRA_FWMARK])
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mark = rta_getattr_u32(tb[FRA_FWMARK]);
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if (filter.fwmark ^ mark)
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return false;
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}
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if (filter.fwmask) {
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__u32 mask = 0;
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if (tb[FRA_FWMASK])
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mask = rta_getattr_u32(tb[FRA_FWMASK]);
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if (filter.fwmask ^ mask)
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return false;
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}
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if (filter.iifmask) {
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if (tb[FRA_IFNAME]) {
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if (strcmp(filter.iif, rta_getattr_str(tb[FRA_IFNAME])) != 0)
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return false;
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} else {
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return false;
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}
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}
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if (filter.oifmask) {
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if (tb[FRA_OIFNAME]) {
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if (strcmp(filter.oif, rta_getattr_str(tb[FRA_OIFNAME])) != 0)
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return false;
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} else {
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return false;
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}
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}
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if (filter.l3mdev && !(tb[FRA_L3MDEV] && rta_getattr_u8(tb[FRA_L3MDEV])))
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return false;
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table = rtm_get_table(r, tb);
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if (filter.tb > 0 && filter.tb ^ table)
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return false;
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return true;
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}
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int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
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{
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FILE *fp = (FILE *)arg;
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@ -77,6 +177,9 @@ int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
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host_len = af_bit_len(r->rtm_family);
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if(!filter_nlmsg(n, tb, host_len))
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return 0;
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if (n->nlmsg_type == RTM_DELRULE)
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fprintf(fp, "Deleted ");
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@ -287,9 +390,9 @@ static int iprule_list_flush_or_save(int argc, char **argv, int action)
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if (af == AF_UNSPEC)
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af = AF_INET;
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if (argc > 0) {
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fprintf(stderr,
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"\"ip rule list/flush/save\" does not take any arguments\n");
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if (action != IPRULE_LIST && argc > 0) {
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fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
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action == IPRULE_SAVE ? "save" : "flush");
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return -1;
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}
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@ -306,6 +409,75 @@ static int iprule_list_flush_or_save(int argc, char **argv, int action)
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filter_fn = print_rule;
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}
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memset(&filter, 0, sizeof(filter));
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while (argc > 0) {
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if (matches(*argv, "preference") == 0 ||
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matches(*argv, "order") == 0 ||
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matches(*argv, "priority") == 0) {
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__u32 pref;
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NEXT_ARG();
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if (get_u32(&pref, *argv, 0))
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invarg("preference value is invalid\n", *argv);
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filter.pref = pref;
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filter.prefmask = 1;
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} else if (strcmp(*argv, "not") == 0) {
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filter.not = 1;
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} else if (strcmp(*argv, "tos") == 0) {
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__u32 tos;
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NEXT_ARG();
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if (rtnl_dsfield_a2n(&tos, *argv))
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invarg("TOS value is invalid\n", *argv);
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filter.tos = tos;
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filter.tosmask = 1;
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} else if (strcmp(*argv, "fwmark") == 0) {
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char *slash;
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__u32 fwmark, fwmask;
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NEXT_ARG();
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slash = strchr(*argv, '/');
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if (slash != NULL)
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*slash = '\0';
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if (get_u32(&fwmark, *argv, 0))
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invarg("fwmark value is invalid\n", *argv);
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filter.fwmark = fwmark;
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if (slash) {
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if (get_u32(&fwmask, slash+1, 0))
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invarg("fwmask value is invalid\n",
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slash+1);
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filter.fwmask = fwmask;
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}
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} else if (strcmp(*argv, "dev") == 0 ||
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strcmp(*argv, "iif") == 0) {
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NEXT_ARG();
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strncpy(filter.iif, *argv, IFNAMSIZ);
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filter.iifmask = 1;
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} else if (strcmp(*argv, "oif") == 0) {
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NEXT_ARG();
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strncpy(filter.oif, *argv, IFNAMSIZ);
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filter.oifmask = 1;
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} else if (strcmp(*argv, "l3mdev") == 0) {
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filter.l3mdev = 1;
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} else if (matches(*argv, "lookup") == 0 ||
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matches(*argv, "table") == 0 ) {
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__u32 tid;
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NEXT_ARG();
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if (rtnl_rttable_a2n(&tid, *argv))
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invarg("table id value is invalid\n", *argv);
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filter.tb = tid;
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} else if (matches(*argv, "from") == 0 ||
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matches(*argv, "src") == 0) {
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NEXT_ARG();
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get_prefix(&filter.src, *argv, af);
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} else {
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if (matches(*argv, "dst") == 0 ||
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matches(*argv, "to") == 0) {
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NEXT_ARG();
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}
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get_prefix(&filter.dst, *argv, af);
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}
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argc--; argv++;
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}
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if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
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perror("Cannot send dump request");
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return 1;
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@ -15,7 +15,8 @@ ip-rule \- routing policy database management
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.ti -8
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.B ip rule
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.RB "[ " list " ]"
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.RB "[ " list
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.RI "[ " SELECTOR " ]]"
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.ti -8
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.B ip rule
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@ -42,7 +43,8 @@ ip-rule \- routing policy database management
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.B oif
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.IR STRING " ] [ "
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.B pref
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.IR NUMBER " ]"
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.IR NUMBER " ] [ "
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.BR l3mdev " ]"
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.ti -8
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.IR ACTION " := [ "
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