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Message-ID: <87d24animx.fsf_-_@x220.int.ebiederm.org>
Date: Sun, 15 Mar 2015 14:52:06 -0500
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Stephen Hemminger <shemming@...cade.com>
Cc: "netdev\@vger.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next 6/8] iproute2: Add support for the RTA_VIA attribute
Add support for the RTA_VIA attribute that specifies an address family
as well as an address for the next hop gateway.
To make it easy to pass this reorder inet_prefix so that it's tail
is a proper RTA_VIA attribute.
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
include/linux/rtnetlink.h | 7 +++++
include/utils.h | 7 +++--
ip/iproute.c | 76 +++++++++++++++++++++++++++++++++++++++++------
man/man8/ip-route.8.in | 18 +++++++----
4 files changed, 90 insertions(+), 18 deletions(-)
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 3eb78105399b..03e4c8df8e60 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -303,6 +303,7 @@ enum rtattr_type_t {
RTA_TABLE,
RTA_MARK,
RTA_MFC_STATS,
+ RTA_VIA,
__RTA_MAX
};
@@ -344,6 +345,12 @@ struct rtnexthop {
#define RTNH_SPACE(len) RTNH_ALIGN(RTNH_LENGTH(len))
#define RTNH_DATA(rtnh) ((struct rtattr*)(((char*)(rtnh)) + RTNH_LENGTH(0)))
+/* RTA_VIA */
+struct rtvia {
+ __kernel_sa_family_t rtvia_family;
+ __u8 rtvia_addr[0];
+};
+
/* RTM_CACHEINFO */
struct rta_cacheinfo {
diff --git a/include/utils.h b/include/utils.h
index 99dde4c5a667..6bbcc10756d3 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -50,10 +50,11 @@ extern void incomplete_command(void) __attribute__((noreturn));
typedef struct
{
- __u8 family;
- __u8 bytelen;
+ __u16 flags;
+ __u16 bytelen;
__s16 bitlen;
- __u32 flags;
+ /* These next two fields match rtvia */
+ __u16 family;
__u32 data[8];
} inet_prefix;
diff --git a/ip/iproute.c b/ip/iproute.c
index 79d0760a34f6..c6ee411fdd56 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -75,7 +75,8 @@ static void usage(void)
fprintf(stderr, " [ table TABLE_ID ] [ proto RTPROTO ]\n");
fprintf(stderr, " [ scope SCOPE ] [ metric METRIC ]\n");
fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
- fprintf(stderr, "NH := [ via ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS\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, " [ rtt TIME ] [ rttvar TIME ] [ reordering NUMBER ]\n");
fprintf(stderr, " [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
@@ -185,8 +186,15 @@ static int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
(r->rtm_family != filter.msrc.family ||
(filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len)))
return 0;
- if (filter.rvia.family && r->rtm_family != filter.rvia.family)
- return 0;
+ if (filter.rvia.family) {
+ int family = r->rtm_family;
+ if (tb[RTA_VIA]) {
+ struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
+ family = via->rtvia_family;
+ }
+ if (family != filter.rvia.family)
+ return 0;
+ }
if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
return 0;
@@ -205,6 +213,12 @@ static int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
via.family = r->rtm_family;
if (tb[RTA_GATEWAY])
memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
+ if (tb[RTA_VIA]) {
+ size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
+ struct rtvia *rtvia = RTA_DATA(tb[RTA_VIA]);
+ via.family = rtvia->rtvia_family;
+ memcpy(&via.data, rtvia->rtvia_addr, len);
+ }
}
if (filter.rprefsrc.bitlen>0) {
memset(&prefsrc, 0, sizeof(prefsrc));
@@ -386,6 +400,14 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
RTA_DATA(tb[RTA_GATEWAY]),
abuf, sizeof(abuf)));
}
+ if (tb[RTA_VIA]) {
+ size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
+ struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
+ fprintf(fp, "via %s %s ",
+ family_name(via->rtvia_family),
+ format_host(via->rtvia_family, len, via->rtvia_addr,
+ abuf, sizeof(abuf)));
+ }
if (tb[RTA_OIF] && filter.oifmask != -1)
fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
@@ -601,6 +623,14 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
RTA_DATA(tb[RTA_GATEWAY]),
abuf, sizeof(abuf)));
}
+ if (tb[RTA_VIA]) {
+ size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
+ struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
+ fprintf(fp, "via %s %s ",
+ family_name(via->rtvia_family),
+ format_host(via->rtvia_family, len, via->rtvia_addr,
+ abuf, sizeof(abuf)));
+ }
if (tb[RTA_FLOW]) {
__u32 to = rta_getattr_u32(tb[RTA_FLOW]);
__u32 from = to>>16;
@@ -648,12 +678,23 @@ static int parse_one_nh(struct rtmsg *r, struct rtattr *rta,
while (++argv, --argc > 0) {
if (strcmp(*argv, "via") == 0) {
inet_prefix addr;
+ int family;
NEXT_ARG();
- get_addr(&addr, *argv, r->rtm_family);
+ family = read_family(*argv);
+ if (family == AF_UNSPEC)
+ family = r->rtm_family;
+ else
+ NEXT_ARG();
+ get_addr(&addr, *argv, family);
if (r->rtm_family == AF_UNSPEC)
r->rtm_family = addr.family;
- rta_addattr_l(rta, 4096, RTA_GATEWAY, &addr.data, addr.bytelen);
- rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
+ if (addr.family == r->rtm_family) {
+ rta_addattr_l(rta, 4096, RTA_GATEWAY, &addr.data, addr.bytelen);
+ rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
+ } else {
+ rta_addattr_l(rta, 4096, RTA_VIA, &addr.family, addr.bytelen+2);
+ rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen+2;
+ }
} else if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
@@ -761,12 +802,21 @@ static int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
} else if (strcmp(*argv, "via") == 0) {
inet_prefix addr;
+ int family;
gw_ok = 1;
NEXT_ARG();
- get_addr(&addr, *argv, req.r.rtm_family);
+ family = read_family(*argv);
+ if (family == AF_UNSPEC)
+ family = req.r.rtm_family;
+ else
+ NEXT_ARG();
+ get_addr(&addr, *argv, 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);
+ if (addr.family == req.r.rtm_family)
+ addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
+ else
+ addattr_l(&req.n, sizeof(req), RTA_VIA, &addr.family, addr.bytelen+2);
} else if (strcmp(*argv, "from") == 0) {
inet_prefix addr;
NEXT_ARG();
@@ -1251,8 +1301,14 @@ static int iproute_list_flush_or_save(int argc, char **argv, int action)
get_unsigned(&mark, *argv, 0);
filter.markmask = -1;
} else if (strcmp(*argv, "via") == 0) {
+ int family;
NEXT_ARG();
- get_prefix(&filter.rvia, *argv, do_ipv6);
+ family = read_family(*argv);
+ if (family == AF_UNSPEC)
+ family = do_ipv6;
+ else
+ NEXT_ARG();
+ get_prefix(&filter.rvia, *argv, family);
} else if (strcmp(*argv, "src") == 0) {
NEXT_ARG();
get_prefix(&filter.rprefsrc, *argv, do_ipv6);
@@ -1554,6 +1610,8 @@ static int iproute_get(int argc, char **argv)
tb[RTA_OIF]->rta_type = 0;
if (tb[RTA_GATEWAY])
tb[RTA_GATEWAY]->rta_type = 0;
+ if (tb[RTA_VIA])
+ tb[RTA_VIA]->rta_type = 0;
if (!idev && tb[RTA_IIF])
tb[RTA_IIF]->rta_type = 0;
req.n.nlmsg_flags = NLM_F_REQUEST;
diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in
index 2b1583d5a30c..906cfea0cd6b 100644
--- a/man/man8/ip-route.8.in
+++ b/man/man8/ip-route.8.in
@@ -81,13 +81,18 @@ replace " } "
.ti -8
.IR NH " := [ "
.B via
-.IR ADDRESS " ] [ "
+[
+.IR FAMILY " ] " ADDRESS " ] [ "
.B dev
.IR STRING " ] [ "
.B weight
.IR NUMBER " ] " NHFLAGS
.ti -8
+.IR FAMILY " := [ "
+.BR inet " | " inet6 " | " ipx " | " dnet " | " bridge " | " link " ]"
+
+.ti -8
.IR OPTIONS " := " FLAGS " [ "
.B mtu
.IR NUMBER " ] [ "
@@ -333,9 +338,10 @@ table by default.
the output device name.
.TP
-.BI via " ADDRESS"
-the address of the nexthop router. Actually, the sense of this field
-depends on the route type. For normal
+.BI via " [ FAMILY ] ADDRESS"
+the address of the nexthop router, in the address family FAMILY.
+Actually, the sense of this field depends on the route type. For
+normal
.B unicast
routes it is either the true next hop router or, if it is a direct
route installed in BSD compatibility mode, it can be a local address
@@ -472,7 +478,7 @@ is a complex value with its own syntax similar to the top level
argument lists:
.in +8
-.BI via " ADDRESS"
+.BI via " [ FAMILY ] ADDRESS"
- is the nexthop router.
.sp
@@ -669,7 +675,7 @@ only list routes of this type.
only list routes going via this device.
.TP
-.BI via " PREFIX"
+.BI via " [ FAMILY ] PREFIX"
only list routes going via the nexthop routers selected by
.IR PREFIX "."
--
2.2.1
--
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