From: Jon Maloy <jmaloy@redhat.com>
To: passt-dev@passt.top
Subject: Re: [RFC 01/12] ip: Introduce multi-address data structures for IPv4 and IPv6
Date: Mon, 15 Dec 2025 17:05:38 -0500 [thread overview]
Message-ID: <aff1dbc4-26ca-4942-a609-4ce3d9db9f88@redhat.com> (raw)
In-Reply-To: <aT_XgjJP9kaBX_s1@zatzit>
On 2025-12-15 04:40, David Gibson wrote:
> On Sun, Dec 14, 2025 at 08:54:30PM -0500, Jon Maloy wrote:
>> As preparation for supporting multiple addresses per interface, we
>> replace the single addr/prefix_len fields with arrays.
>>
>> - We add an ip4_addr_entry and an ip6_addr_entry struct containing
>> address and prefix length.
>>
>> - We set the array sizes to IP4_MAX_ADDRS=8 and IP6_MAX_ADDRS=16,
>> respectively.
>>
>> The only functional change is that the IPv6 prefix length now is
>> properly stored instead of being hardcoded to 64 even when set
>> via the -a option.
>>
>> Signed-off-by: Jon Maloy <jmaloy@redhat.com>
>> ---
>> arp.c | 4 +--
>> conf.c | 97 +++++++++++++++++++++++++++++++++-----------------------
>> dhcp.c | 8 ++---
>> dhcpv6.c | 6 ++--
>> fwd.c | 12 +++----
>> ip.h | 26 +++++++++++++++
>> ndp.c | 6 ++--
>> passt.h | 16 ++++++----
>> pasta.c | 12 ++++---
>> tap.c | 4 +--
>> util.h | 1 +
>> 11 files changed, 122 insertions(+), 70 deletions(-)
>>
>> diff --git a/arp.c b/arp.c
>> index bb042e9..7eaf517 100644
>> --- a/arp.c
>> +++ b/arp.c
>> @@ -54,7 +54,7 @@ static bool ignore_arp(const struct ctx *c,
>> return true;
>>
>> /* Don't resolve the guest's assigned address, either. */
>> - if (!memcmp(am->tip, &c->ip4.addr, sizeof(am->tip)))
>> + if (!memcmp(am->tip, &c->ip4.addrs[0].addr, sizeof(am->tip)))
>> return true;
>>
>> return false;
>> @@ -145,7 +145,7 @@ void arp_send_init_req(const struct ctx *c)
>> memcpy(req.am.sha, c->our_tap_mac, sizeof(req.am.sha));
>> memcpy(req.am.sip, &c->ip4.our_tap_addr, sizeof(req.am.sip));
>> memcpy(req.am.tha, MAC_BROADCAST, sizeof(req.am.tha));
>> - memcpy(req.am.tip, &c->ip4.addr, sizeof(req.am.tip));
>> + memcpy(req.am.tip, &c->ip4.addrs[0].addr, sizeof(req.am.tip));
>>
>> debug("Sending initial ARP request for guest MAC address");
>> tap_send_single(c, &req, sizeof(req));
>> diff --git a/conf.c b/conf.c
>> index fdc19e8..0e96f36 100644
>> --- a/conf.c
>> +++ b/conf.c
>> @@ -694,10 +694,12 @@ static int conf_ip4_prefix(const char *arg)
>> * conf_ip4() - Verify or detect IPv4 support, get relevant addresses
>> * @ifi: Host interface to attempt (0 to determine one)
>> * @ip4: IPv4 context (will be written)
>> + * @permanent: Mark configured addresses as permanent
>> *
>> * Return: interface index for IPv4, or 0 on failure.
>> */
>> -static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4)
>> +static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4,
>> + bool permanent)
>> {
>> if (!ifi)
>> ifi = nl_get_ext_if(nl_sock, AF_INET);
>> @@ -717,33 +719,38 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4)
>> }
>> }
>>
>> - if (IN4_IS_ADDR_UNSPECIFIED(&ip4->addr)) {
>> + if (!ip4->addr_count) {
>> int rc = nl_addr_get(nl_sock, ifi, AF_INET,
>> - &ip4->addr, &ip4->prefix_len, NULL);
>> + &ip4->addrs[0].addr,
>> + &ip4->addrs[0].prefix_len, NULL);
>> if (rc < 0) {
>> debug("Couldn't discover IPv4 address: %s",
>> strerror_(-rc));
>> return 0;
>> }
>> + ip4->addrs[0].permanent = permanent;
>> + ip4->addr_count = 1;
>> }
>>
>> - if (!ip4->prefix_len) {
>> - in_addr_t addr = ntohl(ip4->addr.s_addr);
>> - if (IN_CLASSA(addr))
>> - ip4->prefix_len = (32 - IN_CLASSA_NSHIFT);
>> - else if (IN_CLASSB(addr))
>> - ip4->prefix_len = (32 - IN_CLASSB_NSHIFT);
>> - else if (IN_CLASSC(addr))
>> - ip4->prefix_len = (32 - IN_CLASSC_NSHIFT);
>> + /* Apply default prefix_len to first address if not set */
>> + if (!ip4->addrs[0].prefix_len) {
>> + in_addr_t a = ntohl(ip4->addrs[0].addr.s_addr);
>> +
>> + if (IN_CLASSA(a))
>> + ip4->addrs[0].prefix_len = 8;
>> + else if (IN_CLASSB(a))
>> + ip4->addrs[0].prefix_len = 16;
>> + else if (IN_CLASSC(a))
>> + ip4->addrs[0].prefix_len = 24;
>> else
>> - ip4->prefix_len = 32;
>> + ip4->addrs[0].prefix_len = 32;
>> }
>>
>> - ip4->addr_seen = ip4->addr;
>> + ip4->addr_seen = ip4->addrs[0].addr;
>>
>> ip4->our_tap_addr = ip4->guest_gw;
>>
>> - if (IN4_IS_ADDR_UNSPECIFIED(&ip4->addr))
>> + if (IN4_IS_ADDR_UNSPECIFIED(&ip4->addrs[0].addr))
>> return 0;
>>
>> return ifi;
>> @@ -755,9 +762,9 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4)
>> */
>> static void conf_ip4_local(struct ip4_ctx *ip4)
>> {
>> - ip4->addr_seen = ip4->addr = IP4_LL_GUEST_ADDR;
>> + ip4->addr_seen = ip4->addrs[0].addr = IP4_LL_GUEST_ADDR;
>> ip4->our_tap_addr = ip4->guest_gw = IP4_LL_GUEST_GW;
>> - ip4->prefix_len = IP4_LL_PREFIX_LEN;
>> + ip4->addrs[0].prefix_len = IP4_LL_PREFIX_LEN;
>>
>> ip4->no_copy_addrs = ip4->no_copy_routes = true;
>> }
>> @@ -766,10 +773,12 @@ static void conf_ip4_local(struct ip4_ctx *ip4)
>> * conf_ip6() - Verify or detect IPv6 support, get relevant addresses
>> * @ifi: Host interface to attempt (0 to determine one)
>> * @ip6: IPv6 context (will be written)
>> + * @permanent: Mark discovered addresses as permanent
>> *
>> * Return: interface index for IPv6, or 0 on failure.
>> */
>> -static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6)
>> +static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6,
>> + bool permanent)
>> {
>> int prefix_len = 0;
>> int rc;
>> @@ -792,19 +801,25 @@ static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6)
>> }
>>
>> rc = nl_addr_get(nl_sock, ifi, AF_INET6,
>> - IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ? &ip6->addr : NULL,
>> + ip6->addr_count ? NULL : &ip6->addrs[0].addr,
>> &prefix_len, &ip6->our_tap_ll);
>> if (rc < 0) {
>> debug("Couldn't discover IPv6 address: %s", strerror_(-rc));
>> return 0;
>> }
>>
>> - ip6->addr_seen = ip6->addr;
>> + if (!ip6->addr_count) {
>> + ip6->addrs[0].prefix_len = prefix_len ? prefix_len : 64;
>> + ip6->addrs[0].permanent = permanent;
>> + ip6->addr_count = 1;
>> + }
>> +
>> + ip6->addr_seen = ip6->addrs[0].addr;
>>
>> if (IN6_IS_ADDR_LINKLOCAL(&ip6->guest_gw))
>> ip6->our_tap_ll = ip6->guest_gw;
>>
>> - if (IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ||
>> + if (IN6_IS_ADDR_UNSPECIFIED(&ip6->addrs[0].addr) ||
>> IN6_IS_ADDR_UNSPECIFIED(&ip6->our_tap_ll))
>> return 0;
>>
>> @@ -1149,11 +1164,13 @@ static void conf_print(const struct ctx *c)
>> if (!c->no_dhcp) {
>> uint32_t mask;
>>
>> - mask = htonl(0xffffffff << (32 - c->ip4.prefix_len));
>> + mask = htonl(0xffffffff <<
>> + (32 - c->ip4.addrs[0].prefix_len));
>>
>> info("DHCP:");
>> info(" assign: %s",
>> - inet_ntop(AF_INET, &c->ip4.addr, buf4, sizeof(buf4)));
>> + inet_ntop(AF_INET, &c->ip4.addrs[0].addr,
>> + buf4, sizeof(buf4)));
>> info(" mask: %s",
>> inet_ntop(AF_INET, &mask, buf4, sizeof(buf4)));
>> info(" router: %s",
>> @@ -1191,7 +1208,8 @@ static void conf_print(const struct ctx *c)
>> goto dns6;
>>
>> info(" assign: %s",
>> - inet_ntop(AF_INET6, &c->ip6.addr, buf6, sizeof(buf6)));
>> + inet_ntop(AF_INET6, &c->ip6.addrs[0].addr,
>> + buf6, sizeof(buf6)));
>> info(" router: %s",
>> inet_ntop(AF_INET6, &c->ip6.guest_gw, buf6, sizeof(buf6)));
>> info(" our link-local: %s",
>> @@ -1812,22 +1830,23 @@ void conf(struct ctx *c, int argc, char **argv)
>> break;
>> }
>> case 'a':
>> - if (inet_pton(AF_INET6, optarg, &c->ip6.addr) &&
>> - !IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr) &&
>> - !IN6_IS_ADDR_LOOPBACK(&c->ip6.addr) &&
>> - !IN6_IS_ADDR_V4MAPPED(&c->ip6.addr) &&
>> - !IN6_IS_ADDR_V4COMPAT(&c->ip6.addr) &&
>> - !IN6_IS_ADDR_MULTICAST(&c->ip6.addr)) {
>> + if (inet_pton(AF_INET6, optarg,
>> + &c->ip6.addrs[0].addr) &&
>> + !IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addrs[0].addr) &&
>> + !IN6_IS_ADDR_LOOPBACK(&c->ip6.addrs[0].addr) &&
>> + !IN6_IS_ADDR_V4MAPPED(&c->ip6.addrs[0].addr) &&
>> + !IN6_IS_ADDR_V4COMPAT(&c->ip6.addrs[0].addr) &&
>> + !IN6_IS_ADDR_MULTICAST(&c->ip6.addrs[0].addr)) {
>> if (c->mode == MODE_PASTA)
>> c->ip6.no_copy_addrs = true;
>> break;
>> }
>>
>> - if (inet_pton(AF_INET, optarg, &c->ip4.addr) &&
>> - !IN4_IS_ADDR_UNSPECIFIED(&c->ip4.addr) &&
>> - !IN4_IS_ADDR_BROADCAST(&c->ip4.addr) &&
>> - !IN4_IS_ADDR_LOOPBACK(&c->ip4.addr) &&
>> - !IN4_IS_ADDR_MULTICAST(&c->ip4.addr)) {
>> + if (inet_pton(AF_INET, optarg, &c->ip4.addrs[0].addr) &&
>> + !IN4_IS_ADDR_UNSPECIFIED(&c->ip4.addrs[0].addr) &&
>> + !IN4_IS_ADDR_BROADCAST(&c->ip4.addrs[0].addr) &&
>> + !IN4_IS_ADDR_LOOPBACK(&c->ip4.addrs[0].addr) &&
>> + !IN4_IS_ADDR_MULTICAST(&c->ip4.addrs[0].addr)) {
>> if (c->mode == MODE_PASTA)
>> c->ip4.no_copy_addrs = true;
>> break;
>> @@ -1836,8 +1855,8 @@ void conf(struct ctx *c, int argc, char **argv)
>> die("Invalid address: %s", optarg);
>> break;
>> case 'n':
>> - c->ip4.prefix_len = conf_ip4_prefix(optarg);
>> - if (c->ip4.prefix_len < 0)
>> + c->ip4.addrs[0].prefix_len = conf_ip4_prefix(optarg);
>> + if (c->ip4.addrs[0].prefix_len < 0)
>> die("Invalid netmask: %s", optarg);
>>
>> break;
>> @@ -1984,9 +2003,9 @@ void conf(struct ctx *c, int argc, char **argv)
>>
>> nl_sock_init(c, false);
>> if (!v6_only)
>> - c->ifi4 = conf_ip4(ifi4, &c->ip4);
>> + c->ifi4 = conf_ip4(ifi4, &c->ip4, c->pasta_conf_ns);
>> if (!v4_only)
>> - c->ifi6 = conf_ip6(ifi6, &c->ip6);
>> + c->ifi6 = conf_ip6(ifi6, &c->ip6, c->pasta_conf_ns);
>>
>> if (c->ifi4 && c->mtu < IPV4_MIN_MTU) {
>> warn("MTU %"PRIu16" is too small for IPv4 (minimum %u)",
>> @@ -2125,7 +2144,7 @@ void conf(struct ctx *c, int argc, char **argv)
>> if (!c->ifi6) {
>> c->no_ndp = 1;
>> c->no_dhcpv6 = 1;
>> - } else if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr)) {
>> + } else if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addrs[0].addr)) {
>> c->no_dhcpv6 = 1;
>> }
>>
>> diff --git a/dhcp.c b/dhcp.c
>> index 6b9c2e3..46ef8e3 100644
>> --- a/dhcp.c
>> +++ b/dhcp.c
>> @@ -352,7 +352,7 @@ int dhcp(const struct ctx *c, struct iov_tail *data)
>> reply.secs = 0;
>> reply.flags = m->flags;
>> reply.ciaddr = m->ciaddr;
>> - reply.yiaddr = c->ip4.addr;
>> + reply.yiaddr = c->ip4.addrs[0].addr;
>> reply.siaddr = 0;
>> reply.giaddr = m->giaddr;
>> memcpy(&reply.chaddr, m->chaddr, sizeof(reply.chaddr));
>> @@ -404,7 +404,7 @@ int dhcp(const struct ctx *c, struct iov_tail *data)
>>
>> info(" from %s", eth_ntop(m->chaddr, macstr, sizeof(macstr)));
>>
>> - mask.s_addr = htonl(0xffffffff << (32 - c->ip4.prefix_len));
>> + mask.s_addr = htonl(0xffffffff << (32 - c->ip4.addrs[0].prefix_len));
>> memcpy(opts[1].s, &mask, sizeof(mask));
>> memcpy(opts[3].s, &c->ip4.guest_gw, sizeof(c->ip4.guest_gw));
>> memcpy(opts[54].s, &c->ip4.our_tap_addr, sizeof(c->ip4.our_tap_addr));
>> @@ -412,7 +412,7 @@ int dhcp(const struct ctx *c, struct iov_tail *data)
>> /* If the gateway is not on the assigned subnet, send an option 121
>> * (Classless Static Routing) adding a dummy route to it.
>> */
>> - if ((c->ip4.addr.s_addr & mask.s_addr)
>> + if ((c->ip4.addrs[0].addr.s_addr & mask.s_addr)
>> != (c->ip4.guest_gw.s_addr & mask.s_addr)) {
>> /* a.b.c.d/32:0.0.0.0, 0:a.b.c.d */
>> opts[121].slen = 14;
>> @@ -469,7 +469,7 @@ int dhcp(const struct ctx *c, struct iov_tail *data)
>> if (m->flags & FLAG_BROADCAST)
>> dst = in4addr_broadcast;
>> else
>> - dst = c->ip4.addr;
>> + dst = c->ip4.addrs[0].addr;
>>
>> tap_udp4_send(c, c->ip4.our_tap_addr, 67, dst, 68, &reply, dlen);
>>
>> diff --git a/dhcpv6.c b/dhcpv6.c
>> index e4df0db..7eae6a1 100644
>> --- a/dhcpv6.c
>> +++ b/dhcpv6.c
>> @@ -625,7 +625,7 @@ int dhcpv6(struct ctx *c, struct iov_tail *data,
>> if (mh->type == TYPE_CONFIRM && server_id)
>> return -1;
>>
>> - if (dhcpv6_ia_notonlink(data, &c->ip6.addr)) {
>> + if (dhcpv6_ia_notonlink(data, &c->ip6.addrs[0].addr)) {
>>
>> dhcpv6_send_ia_notonlink(c, data, &client_id_base,
>> ntohs(client_id->l), mh->xid);
>> @@ -679,7 +679,7 @@ int dhcpv6(struct ctx *c, struct iov_tail *data,
>>
>> tap_udp6_send(c, src, 547, tap_ip6_daddr(c, src), 546,
>> mh->xid, &resp, n);
>> - c->ip6.addr_seen = c->ip6.addr;
>> + c->ip6.addr_seen = c->ip6.addrs[0].addr;
>>
>> return 1;
>> }
>> @@ -703,5 +703,5 @@ void dhcpv6_init(const struct ctx *c)
>> memcpy(resp_not_on_link.server_id.duid_lladdr,
>> c->our_tap_mac, sizeof(c->our_tap_mac));
>>
>> - resp.ia_addr.addr = c->ip6.addr;
>> + resp.ia_addr.addr = c->ip6.addrs[0].addr;
>> }
>> diff --git a/fwd.c b/fwd.c
>> index 44a0e10..408af30 100644
>> --- a/fwd.c
>> +++ b/fwd.c
>> @@ -516,7 +516,7 @@ static bool fwd_guest_accessible4(const struct ctx *c,
>> /* For IPv4, addr_seen is initialised to addr, so is always a valid
>> * address
>> */
>> - if (IN4_ARE_ADDR_EQUAL(addr, &c->ip4.addr) ||
>> + if (IN4_ARE_ADDR_EQUAL(addr, &c->ip4.addrs[0].addr) ||
>> IN4_ARE_ADDR_EQUAL(addr, &c->ip4.addr_seen))
>> return false;
>>
>> @@ -537,7 +537,7 @@ static bool fwd_guest_accessible6(const struct ctx *c,
>> if (IN6_IS_ADDR_LOOPBACK(addr))
>> return false;
>>
>> - if (IN6_ARE_ADDR_EQUAL(addr, &c->ip6.addr))
>> + if (IN6_ARE_ADDR_EQUAL(addr, &c->ip6.addrs[0].addr))
>> return false;
>>
>> /* For IPv6, addr_seen starts unspecified, because we don't know what LL
>> @@ -587,9 +587,9 @@ static void nat_outbound(const struct ctx *c, const union inany_addr *addr,
>> else if (inany_equals6(addr, &c->ip6.map_host_loopback))
>> *translated = inany_loopback6;
>> else if (inany_equals4(addr, &c->ip4.map_guest_addr))
>> - *translated = inany_from_v4(c->ip4.addr);
>> + *translated = inany_from_v4(c->ip4.addrs[0].addr);
>> else if (inany_equals6(addr, &c->ip6.map_guest_addr))
>> - translated->a6 = c->ip6.addr;
>> + translated->a6 = c->ip6.addrs[0].addr;
>> else
>> *translated = *addr;
>> }
>> @@ -710,10 +710,10 @@ bool nat_inbound(const struct ctx *c, const union inany_addr *addr,
>> inany_equals6(addr, &in6addr_loopback)) {
>> translated->a6 = c->ip6.map_host_loopback;
>> } else if (!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.map_guest_addr) &&
>> - inany_equals4(addr, &c->ip4.addr)) {
>> + inany_equals4(addr, &c->ip4.addrs[0].addr)) {
>> *translated = inany_from_v4(c->ip4.map_guest_addr);
>> } else if (!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.map_guest_addr) &&
>> - inany_equals6(addr, &c->ip6.addr)) {
>> + inany_equals6(addr, &c->ip6.addrs[0].addr)) {
>> translated->a6 = c->ip6.map_guest_addr;
>> } else if (fwd_guest_accessible(c, addr)) {
>> *translated = *addr;
>> diff --git a/ip.h b/ip.h
>> index 5830b92..748cb1f 100644
>> --- a/ip.h
>> +++ b/ip.h
>> @@ -135,4 +135,30 @@ static const struct in_addr in4addr_broadcast = { 0xffffffff };
>> #define IPV6_MIN_MTU 1280
>> #endif
>>
>> +/* Maximum number of addresses per address family */
>> +#define IP4_MAX_ADDRS 8
>> +#define IP6_MAX_ADDRS 16
>> +
>> +/**
>> + * struct ip4_addr_entry - IPv4 address with prefix length
>> + * @addr: IPv4 address
>> + * @prefix_len: Prefix length (netmask bits)
>> + */
>> +struct ip4_addr_entry {
>> + struct in_addr addr;
>> + int prefix_len;
>> + int permanent;
>
> Might as well make these uint8_t and bool, respectively. There will
> be some padding, but the overall structure will still be smaller.
>
> Or, it might be worth considering replacing 'permanent' with a flags
> mask, in case we have future uses for it.
Agree with that. I'll make that change, and if we ver need more we can
replace the boolean with a bitmask.
/jon
>
next prev parent reply other threads:[~2025-12-15 22:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-15 1:54 [RFC 00/12] Support for multiple address and late binding Jon Maloy
2025-12-15 1:54 ` [RFC 01/12] ip: Introduce multi-address data structures for IPv4 and IPv6 Jon Maloy
2025-12-15 9:40 ` David Gibson
2025-12-15 22:05 ` Jon Maloy [this message]
2025-12-16 1:58 ` Jon Maloy
2025-12-16 3:14 ` David Gibson
2025-12-15 9:46 ` David Gibson
2025-12-15 1:54 ` [RFC 02/12] ip: Add ip4_default_prefix_len() helper function for class-based prefix Jon Maloy
2025-12-15 9:41 ` David Gibson
2025-12-15 1:54 ` [RFC 03/12] conf: Allow multiple -a/--address options per address family Jon Maloy
2025-12-15 9:53 ` David Gibson
2025-12-15 1:54 ` [RFC 04/12] conf: Apply -n/--netmask to most recently added address Jon Maloy
2025-12-15 9:54 ` David Gibson
2025-12-15 22:43 ` Jon Maloy
2025-12-15 1:54 ` [RFC 05/12] fwd: Check all configured addresses in guest accessibility functions Jon Maloy
2025-12-15 10:06 ` David Gibson
2025-12-15 1:54 ` [RFC 06/12] arp: Check all configured addresses in ARP filtering Jon Maloy
2025-12-15 10:07 ` David Gibson
2025-12-15 1:54 ` [RFC 07/12] netlink: Subscribe to link/address changes in namespace Jon Maloy
2025-12-15 10:32 ` David Gibson
2025-12-15 23:25 ` Jon Maloy
2025-12-16 3:21 ` David Gibson
2025-12-15 1:54 ` [RFC 08/12] netlink: Subscribe to route " Jon Maloy
2025-12-15 10:38 ` David Gibson
2025-12-15 1:54 ` [RFC 09/12] netlink: Add host-side monitoring for late template interface binding Jon Maloy
2025-12-15 1:54 ` [RFC 10/12] netlink: Add host-side route monitoring and propagation Jon Maloy
2025-12-15 1:54 ` [RFC 11/12] netlink: Prevent host route events from overwriting guest-configured gateway Jon Maloy
2025-12-15 1:54 ` [RFC 12/12] netlink: Rename tap interface when late binding discovers template name Jon Maloy
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