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add support for the RTA_NEWDST attribute.

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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>
This commit is contained in:
Eric W. Biederman 2015-03-15 14:53:11 -05:00 committed by Stephen Hemminger
parent 93ae283594
commit 6f7a9f4dc5
2 changed files with 23 additions and 1 deletions
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19
ip/iproute.c
View File

@ -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)));
@ -802,6 +809,16 @@ 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;

5
man/man8/ip-route.8.in
View File

@ -98,6 +98,11 @@ replace " } "
.IR NUMBER " ] [ "
.B advmss
.IR NUMBER " ] [ "
.B as
[
.B to
]
.IR ADDRESS " ]"
.B rtt
.IR TIME " ] [ "
.B rttvar