@@ -304,6 +304,7 @@ enum rtattr_type_t {
RTA_MARK,
RTA_MFC_STATS,
RTA_VIA,
+ RTA_NEWDST,
__RTA_MAX
};
@@ -77,7 +77,7 @@ static void usage(void)
fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
fprintf(stderr, "NH := [ via [ FAMILY ] ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
fprintf(stderr, "FAMILY := [ inet | inet6 | ipx | dnet | bridge | link ]");
- fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ]\n");
+ fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ] [ as [ to ] ADDRESS ]\n");
fprintf(stderr, " [ rtt TIME ] [ rttvar TIME ] [ reordering NUMBER ]\n");
fprintf(stderr, " [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
fprintf(stderr, " [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
@@ -388,6 +388,13 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
} else if (r->rtm_src_len) {
fprintf(fp, "from 0/%u ", r->rtm_src_len);
}
+ if (tb[RTA_NEWDST]) {
+ fprintf(fp, "as to %s ", format_host(r->rtm_family,
+ RTA_PAYLOAD(tb[RTA_NEWDST]),
+ RTA_DATA(tb[RTA_NEWDST]),
+ abuf, sizeof(abuf))
+ );
+ }
if (r->rtm_tos && filter.tosmask != -1) {
SPRINT_BUF(b1);
fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
@@ -800,6 +807,16 @@ static int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
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, "as") == 0) {
+ inet_prefix addr;
+ NEXT_ARG();
+ if (strcmp(*argv, "to") == 0) {
+ 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_NEWDST, &addr.data, addr.bytelen);
} else if (strcmp(*argv, "via") == 0) {
inet_prefix addr;
int family;
@@ -98,6 +98,11 @@ replace " } "
.IR NUMBER " ] [ "
.B advmss
.IR NUMBER " ] [ "
+.B as
+[
+.B to
+]
+.IR ADDRESS " ]"
.B rtt
.IR TIME " ] [ "
.B rttvar
This attribute is like RTA_DST except it specifies the destination address to place on a packet when it leaves the host. For ip based protocols this is destination NAT and not a common part of forwarding. For protocols like MPLS label swapping is something that typically happens on every hop. There is likely to be a RTA_NEWSRC at some point so RTA_NEWDST is printed as "as to" and can be specified either as "as to" or just "as" Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> --- include/linux/rtnetlink.h | 1 + ip/iproute.c | 19 ++++++++++++++++++- man/man8/ip-route.8.in | 5 +++++ 3 files changed, 24 insertions(+), 1 deletion(-)