zebra: set connected route metric based on the devaddr metric

MACVLAN devices are typically used for applications such as VRR/VRRP that
require a second MAC address (virtual). These devices have a corresponding
SVI/VLAN device -
root@TORC11:~# ip addr show vlan1002
39: vlan1002@bridge: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9152 qdisc noqueue master vrf1 state UP group default
    link/ether 00:02:00:00:00:2e brd ff:ff:ff:ff:ff:ff
    inet6 2001:aa:1::2/64 scope global
       valid_lft forever preferred_lft forever
root@TORC11:~# ip addr show vlan1002-v0
40: vlan1002-v0@vlan1002: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9152 qdisc noqueue master vrf1 state UP group default
    link/ether 00:00:5e:00:01:01 brd ff:ff:ff:ff:ff:ff
    inet6 2001:aa:1::a/64 metric 1024 scope global
       valid_lft forever preferred_lft forever
root@TORC11:~#

The macvlan device is used primarily for RX (VR-IP/VR-MAC). And TX is via
the SVI. To acheive that functionality the macvlan network's metric
is set to a higher value.

Zebra currently ignores the devaddr metric sent by the kernel and hardcodes
it to 0. This commit eliminates that hardcoding. If the devaddr metric
is available (METRIC_MAX) it is used for setting up the connected route
otherwise we fallback to the dev/interface metric.

Setting the macvlan metric to a higher value ensures that zebra will always
select the connected route on the SVI (and subsequently use it for next hop
resolution etc.) -
root@TORC11:~# vtysh -c "show ip route vrf vrf1 2001:aa:1::/64"
Routing entry for 2001:aa:1::/64
  Known via "connected", distance 0, metric 1024, vrf vrf1
  Last update 11:30:56 ago
  * directly connected, vlan1002-v0

Routing entry for 2001:aa:1::/64
  Known via "connected", distance 0, metric 0, vrf vrf1, best
  Last update 11:30:56 ago
  * directly connected, vlan1002

root@TORC11:~#

Ticket: CM-23511
Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>

diff --git a/include/linux/if_addr.h b/include/linux/if_addr.h
new file mode 100644 (file)
index 0000000..a924606
--- /dev/null
+++ b/include/linux/if_addr.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __LINUX_IF_ADDR_H
+#define __LINUX_IF_ADDR_H
+
+#include <linux/types.h>
+#include <linux/netlink.h>
+
+struct ifaddrmsg {
+       __u8            ifa_family;
+       __u8            ifa_prefixlen;  /* The prefix length            */
+       __u8            ifa_flags;      /* Flags                        */
+       __u8            ifa_scope;      /* Address scope                */
+       __u32           ifa_index;      /* Link index                   */
+};
+
+/*
+ * Important comment:
+ * IFA_ADDRESS is prefix address, rather than local interface address.
+ * It makes no difference for normally configured broadcast interfaces,
+ * but for point-to-point IFA_ADDRESS is DESTINATION address,
+ * local address is supplied in IFA_LOCAL attribute.
+ *
+ * IFA_FLAGS is a u32 attribute that extends the u8 field ifa_flags.
+ * If present, the value from struct ifaddrmsg will be ignored.
+ */
+enum {
+       IFA_UNSPEC,
+       IFA_ADDRESS,
+       IFA_LOCAL,
+       IFA_LABEL,
+       IFA_BROADCAST,
+       IFA_ANYCAST,
+       IFA_CACHEINFO,
+       IFA_MULTICAST,
+       IFA_FLAGS,
+       IFA_RT_PRIORITY,  /* u32, priority/metric for prefix route */
+       __IFA_MAX,
+};
+
+#define IFA_MAX (__IFA_MAX - 1)
+
+/* ifa_flags */
+#define IFA_F_SECONDARY                0x01
+#define IFA_F_TEMPORARY                IFA_F_SECONDARY
+
+#define        IFA_F_NODAD             0x02
+#define IFA_F_OPTIMISTIC       0x04
+#define IFA_F_DADFAILED                0x08
+#define        IFA_F_HOMEADDRESS       0x10
+#define IFA_F_DEPRECATED       0x20
+#define IFA_F_TENTATIVE                0x40
+#define IFA_F_PERMANENT                0x80
+#define IFA_F_MANAGETEMPADDR   0x100
+#define IFA_F_NOPREFIXROUTE    0x200
+#define IFA_F_MCAUTOJOIN       0x400
+#define IFA_F_STABLE_PRIVACY   0x800
+
+struct ifa_cacheinfo {
+       __u32   ifa_prefered;
+       __u32   ifa_valid;
+       __u32   cstamp; /* created timestamp, hundredths of seconds */
+       __u32   tstamp; /* updated timestamp, hundredths of seconds */
+};
+
+/* backwards compatibility for userspace */
+#define IFA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
+#define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
+
+#endif

diff --git a/include/subdir.am b/include/subdir.am
index 731785d4b4dd61ffdfe802197d8abf8601e5f69e..0d7fed28529e12bcf0f6fe869640363dd974908c 100644 (file)
--- a/include/subdir.am
+++ b/include/subdir.am
@@ -1,4 +1,5 @@
 noinst_HEADERS += \
+       include/linux/if_addr.h \
        include/linux/if_bridge.h \
        include/linux/if_link.h \
        include/linux/lwtunnel.h \

diff --git a/lib/if.h b/lib/if.h
index 166bfa92b52b610e7ae95ca1627018e72204ee11..5b46ed820462db746164896767af1b66193fc32b 100644 (file)
--- a/lib/if.h
+++ b/lib/if.h
@@ -341,6 +341,8 @@ DECLARE_QOBJ_TYPE(interface)
 DECLARE_HOOK(if_add, (struct interface * ifp), (ifp))
 DECLARE_KOOH(if_del, (struct interface * ifp), (ifp))
 
+#define METRIC_MAX (~0)
+
 /* Connected address structure. */
 struct connected {
        /* Attached interface. */
@@ -388,6 +390,13 @@ struct connected {
 
        /* Label for Linux 2.2.X and upper. */
        char *label;
+
+       /*
+        * Used for setting the connected route's cost. If the metric
+        * here is set to METRIC_MAX the connected route falls back to
+        * "struct interface"
+        */
+       uint32_t metric;
 };
 
 /* Nbr Connected address structure. */

diff --git a/zebra/connected.c b/zebra/connected.c
index ab66eb3324aa86208f22d61d5beb2189365342b7..c449855f6dfb40901485e334a6b60a2544887ea9 100644 (file)
--- a/zebra/connected.c
+++ b/zebra/connected.c
@@ -209,6 +209,7 @@ void connected_up(struct interface *ifp, struct connected *ifc)
                .ifindex = ifp->ifindex,
                .vrf_id = ifp->vrf_id,
        };
+       uint32_t metric;
 
        if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
                return;
@@ -243,11 +244,13 @@ void connected_up(struct interface *ifp, struct connected *ifc)
                break;
        }
 
+       metric = (ifc->metric < (uint32_t)METRIC_MAX) ?
+                               ifc->metric : ifp->metric;
        rib_add(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
-               NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);
+               NULL, &nh, RT_TABLE_MAIN, metric, 0, 0, 0);
 
        rib_add(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
-               NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);
+               NULL, &nh, RT_TABLE_MAIN, metric, 0, 0, 0);
 
        if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
                char buf[PREFIX_STRLEN];
@@ -276,7 +279,7 @@ void connected_up(struct interface *ifp, struct connected *ifc)
 /* Add connected IPv4 route to the interface. */
 void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
                        uint16_t prefixlen, struct in_addr *broad,
-                       const char *label)
+                       const char *label, uint32_t metric)
 {
        struct prefix_ipv4 *p;
        struct connected *ifc;
@@ -288,6 +291,7 @@ void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
        ifc = connected_new();
        ifc->ifp = ifp;
        ifc->flags = flags;
+       ifc->metric = metric;
        /* If we get a notification from the kernel,
         * we can safely assume the address is known to the kernel */
        SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
@@ -500,7 +504,7 @@ void connected_delete_ipv4(struct interface *ifp, int flags,
 /* Add connected IPv6 route to the interface. */
 void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
                        struct in6_addr *broad, uint16_t prefixlen,
-                       const char *label)
+                       const char *label, uint32_t metric)
 {
        struct prefix_ipv6 *p;
        struct connected *ifc;
@@ -512,6 +516,7 @@ void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
        ifc = connected_new();
        ifc->ifp = ifp;
        ifc->flags = flags;
+       ifc->metric = metric;
        /* If we get a notification from the kernel,
         * we can safely assume the address is known to the kernel */
        SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);

diff --git a/zebra/connected.h b/zebra/connected.h
index 415ecfd96518148a67f450d22e408e504df4c49d..faba30b0d5c653a30a9e4208070cf9115295f905 100644 (file)
--- a/zebra/connected.h
+++ b/zebra/connected.h
@@ -36,7 +36,8 @@ extern struct connected *connected_check_ptp(struct interface *ifp,
 
 extern void connected_add_ipv4(struct interface *ifp, int flags,
                               struct in_addr *addr, uint16_t prefixlen,
-                              struct in_addr *broad, const char *label);
+                              struct in_addr *broad, const char *label,
+                              uint32_t metric);
 
 extern void connected_delete_ipv4(struct interface *ifp, int flags,
                                  struct in_addr *addr, uint16_t prefixlen,
@@ -49,7 +50,8 @@ extern void connected_down(struct interface *ifp, struct connected *ifc);
 
 extern void connected_add_ipv6(struct interface *ifp, int flags,
                               struct in6_addr *address, struct in6_addr *broad,
-                              uint16_t prefixlen, const char *label);
+                              uint16_t prefixlen, const char *label,
+                              uint32_t metric);
 extern void connected_delete_ipv6(struct interface *ifp,
                                  struct in6_addr *address,
                                  struct in6_addr *broad, uint16_t prefixlen);

diff --git a/zebra/if_ioctl.c b/zebra/if_ioctl.c
index df79d285a3609e3807523928be4dc83978b13290..debc151d752dd770beb6b4537b9438a3e6c95e37 100644 (file)
--- a/zebra/if_ioctl.c
+++ b/zebra/if_ioctl.c
@@ -236,7 +236,8 @@ static int if_getaddrs(void)
                        }
 
                        connected_add_ipv4(ifp, flags, &addr->sin_addr,
-                                          prefixlen, dest_pnt, NULL);
+                                          prefixlen, dest_pnt, NULL,
+                                          METRIC_MAX);
                }
                if (ifap->ifa_addr->sa_family == AF_INET6) {
                        struct sockaddr_in6 *addr;
@@ -258,7 +259,7 @@ static int if_getaddrs(void)
 #endif
 
                        connected_add_ipv6(ifp, flags, &addr->sin6_addr, NULL,
-                                          prefixlen, NULL);
+                                          prefixlen, NULL, METRIC_MAX);
                }
        }
 

diff --git a/zebra/if_ioctl_solaris.c b/zebra/if_ioctl_solaris.c
index 0206d4938efda498eb908772f28b574a8cb56396..2c29930c3f661d2ab80b6141d63e9b682bc05dbf 100644 (file)
--- a/zebra/if_ioctl_solaris.c
+++ b/zebra/if_ioctl_solaris.c
@@ -302,10 +302,11 @@ static int if_get_addr(struct interface *ifp, struct sockaddr *addr,
        /* Set address to the interface. */
        if (af == AF_INET)
                connected_add_ipv4(ifp, flags, &SIN(addr)->sin_addr, prefixlen,
-                                  (struct in_addr *)dest_pnt, label);
+                                  (struct in_addr *)dest_pnt, label,
+                                  METRIC_MAX);
        else if (af == AF_INET6)
                connected_add_ipv6(ifp, flags, &SIN6(addr)->sin6_addr, NULL,
-                                  prefixlen, label);
+                                  prefixlen, label, METRIC_MAX);
 
        return 0;
 }

diff --git a/zebra/if_netlink.c b/zebra/if_netlink.c
index 0cecce5e74b79c961f0a2d1821e6089518355fa8..47087d4ce01c5a6c0e589c3a606281e1ca58c4ec 100644 (file)
--- a/zebra/if_netlink.c
+++ b/zebra/if_netlink.c
@@ -924,6 +924,7 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
        uint8_t flags = 0;
        char *label = NULL;
        struct zebra_ns *zns;
+       uint32_t metric = METRIC_MAX;
 
        zns = zebra_ns_lookup(ns_id);
        ifa = NLMSG_DATA(h);
@@ -1032,6 +1033,9 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
        if (label && strcmp(ifp->name, label) == 0)
                label = NULL;
 
+       if (tb[IFA_RT_PRIORITY])
+               metric = *(uint32_t *)RTA_DATA(tb[IFA_RT_PRIORITY]);
+
        /* Register interface address to the interface. */
        if (ifa->ifa_family == AF_INET) {
                if (ifa->ifa_prefixlen > IPV4_MAX_BITLEN) {
@@ -1044,7 +1048,8 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
                if (h->nlmsg_type == RTM_NEWADDR)
                        connected_add_ipv4(ifp, flags, (struct in_addr *)addr,
                                           ifa->ifa_prefixlen,
-                                          (struct in_addr *)broad, label);
+                                          (struct in_addr *)broad, label,
+                                          metric);
                else
                        connected_delete_ipv4(
                                ifp, flags, (struct in_addr *)addr,
@@ -1070,7 +1075,8 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
                                connected_add_ipv6(ifp, flags,
                                                   (struct in6_addr *)addr,
                                                   (struct in6_addr *)broad,
-                                                  ifa->ifa_prefixlen, label);
+                                                  ifa->ifa_prefixlen, label,
+                                                  metric);
                } else
                        connected_delete_ipv6(ifp, (struct in6_addr *)addr,
                                              (struct in6_addr *)broad,

diff --git a/zebra/kernel_socket.c b/zebra/kernel_socket.c
index f3561cc19d3f7d6836c0482e6f17810520560bad..acd7f911dcefbf62888908f7305a67387ad1bc87 100644 (file)
--- a/zebra/kernel_socket.c
+++ b/zebra/kernel_socket.c
@@ -906,7 +906,8 @@ int ifam_read(struct ifa_msghdr *ifam)
                        connected_add_ipv4(ifp, flags, &addr.sin.sin_addr,
                                           ip_masklen(mask.sin.sin_addr),
                                           &brd.sin.sin_addr,
-                                          (isalias ? ifname : NULL));
+                                          (isalias ? ifname : NULL),
+                                          METRIC_MAX);
                else
                        connected_delete_ipv4(ifp, flags, &addr.sin.sin_addr,
                                              ip_masklen(mask.sin.sin_addr),
@@ -923,7 +924,8 @@ int ifam_read(struct ifa_msghdr *ifam)
                        connected_add_ipv6(ifp, flags, &addr.sin6.sin6_addr,
                                           NULL,
                                           ip6_masklen(mask.sin6.sin6_addr),
-                                          (isalias ? ifname : NULL));
+                                          (isalias ? ifname : NULL),
+                                          METRIC_MAX);
                else
                        connected_delete_ipv6(ifp, &addr.sin6.sin6_addr, NULL,
                                              ip6_masklen(mask.sin6.sin6_addr));