- dev - passt

[PATCH v5 0/3] dhcp: Add support for Rapid Commit, broadcast replies
by Stefano Brivio 26 Nov '24

26 Nov '24

These are all changes coming from pending muvm experiments where I'm trying to speed up and simplify the networking setup in the guest. v5: In 2/3, keep the condition: (opts[53].clen <= 0 || opts[53].c[0] == DHCPREQUEST) as it was, instead of replacing || with && v4: In 1/3, don't swap the "BOOTP" and "DHCP" labels: we want to print "BOOTP" if option 53 isn't there or has zero length, not the other way around. Further, check that clen for option 53 is > 0 before checking if it's a DHCPDISCOVER. Given that DHCPDISCOVER is 1 (not 0), this happened to already work for BOOTP, but it worked by mistake v3: In 1/3, set 'slen' for options we won't send to -1 in dhcp_init(), and reset it for option 80 every time we handle a DHCP request. Add a comment about DHCP needing a valid message type (option 53) v2: In 3/3, add in4addr_broadcast to ip.h, instead of open-coding it in dhcp() Stefano Brivio (3): dhcp: Use -1 as "missing option" length instead of 0 dhcp: Introduce support for Rapid Commit (option 80, RFC 4039) dhcp: Honour broadcast flag (RFC 2131, 4.1) dhcp.c | 53 +++++++++++++++++++++++++++++++++++++++++------------ ip.h | 3 +++ 2 files changed, 44 insertions(+), 12 deletions(-) -- 2.43.0

1 3

[PATCH v4 0/3] dhcp: Add support for Rapid Commit, broadcast replies
by Stefano Brivio 26 Nov '24

26 Nov '24

These are all changes coming from pending muvm experiments where I'm trying to speed up and simplify the networking setup in the guest. v4: In 1/3, don't swap the "BOOTP" and "DHCP" labels: we want to print "BOOTP" if option 53 isn't there or has zero length, not the other way around. Further, check that clen for option 53 is > 0 before checking if it's a DHCPDISCOVER. Given that DHCPDISCOVER is 1 (not 0), this happened to already work for BOOTP, but it worked by mistake v3: In 1/3, set 'slen' for options we won't send to -1 in dhcp_init(), and reset it for option 80 every time we handle a DHCP request. Add a comment about DHCP needing a valid message type (option 53) v2: In 3/3, add in4addr_broadcast to ip.h, instead of open-coding it in dhcp() Stefano Brivio (3): dhcp: Use -1 as "missing option" length instead of 0 dhcp: Introduce support for Rapid Commit (option 80, RFC 4039) dhcp: Honour broadcast flag (RFC 2131, 4.1) dhcp.c | 53 +++++++++++++++++++++++++++++++++++++++++------------ ip.h | 3 +++ 2 files changed, 44 insertions(+), 12 deletions(-) -- 2.43.0

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[PATCH] test/passt/ndp: Add delay in SLAAC prefix test before looking for kernel_ra address
by Stefano Brivio 26 Nov '24

26 Nov '24

I'm not exactly sure why we need this delay, but commit 9a0e544f05bf ("test: Improve test for NDP assigned prefix") broke the tests for me. I think it's because the kernel (at least all the versions I'm testing with) might not mark an address as 'kernel_ra' right away, so the jq expression doesn't return any result when we check. Fixes: 9a0e544f05bf ("test: Improve test for NDP assigned prefix") Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- test/passt/ndp | 1 + 1 file changed, 1 insertion(+) diff --git a/test/passt/ndp b/test/passt/ndp index 56b385b..9a1c9a4 100644 --- a/test/passt/ndp +++ b/test/passt/ndp @@ -23,6 +23,7 @@ hout HOST_IFNAME6 ip -j -6 route show|jq -rM '[.[] | select(.dst == "default").d check [ -n "__IFNAME__" ] test SLAAC: prefix +sleep 2 gout ADDR6 ip -j -6 addr show|jq -rM '[.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global" and .protocol == "kernel_ra") | .local + "/" + (.prefixlen | tostring)] | .[0]' gout PREFIX6 sipcalc __ADDR6__ | grep prefix | cut -d' ' -f4 hout HOST_ADDR6 ip -j -6 addr show|jq -rM '[.[] | select(.ifname == "__HOST_IFNAME6__").addr_info[] | select(.scope == "global" and .deprecated != true).local] | .[0]' -- 2.43.0

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[PATCH] ndp: Don't send first periodic router advertisement right after guest connects
by Stefano Brivio 26 Nov '24

26 Nov '24

This is very visible with muvm, but it also happens with QEMU: we're sending the first unsolicited router advertisement milliseconds after the guest connects. That's usually pointless because, when the hypervisor connects, the guest is typically not ready yet to process anything of that sort: it's still booting. And if we happen to send it late enough (still milliseconds), with muvm, while the message is discarded, it sometimes (slightly) delays the response to the first solicited router advertisement, which is the one we need to have coming fast. Skip sending the unsolicited advertisement on the first timer run, just calculate the next delay. Keep it simple by observing that we're probably not trying to reach the 1970s with IPv6. Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- ndp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/ndp.c b/ndp.c index 1752d64..37bf7a3 100644 --- a/ndp.c +++ b/ndp.c @@ -420,9 +420,13 @@ void ndp_timer(const struct ctx *c, const struct timespec *now) interval = min_rtr_adv_interval + random() % (max_rtr_adv_interval - min_rtr_adv_interval); + if (!next_ra) + goto first; + info("NDP: sending unsolicited RA, next in %llds", (long long)interval); ndp_ra(c, &in6addr_ll_all_nodes); +first: next_ra = now->tv_sec + interval; } -- 2.43.0

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[PATCH v2] treewide: Introduce 'local mode' for disconnected setups
by Stefano Brivio 26 Nov '24

26 Nov '24

There are setups where no host interface is available or configured at all, intentionally or not, temporarily or not, but users expect (Podman) containers to run in any case as they did with slirp4netns, and we're now getting reports that we broke such setups at a rather alarming rate. To this end, if we don't find any usable host interface, instead of exiting: - for IPv4, use 169.254.2.1 as guest/container address and 169.254.2.2 as default gateway - for IPv6, don't assign any address (forcibly disable DHCPv6), and use the *first* link-local address we observe to represent the guest/container. Advertise fe80::1 as default gateway - use 'tap0' as default interface name for pasta Change ifi4 and ifi6 in struct ctx to int and accept a special -1 value meaning that no host interface was selected, but the IP family is enabled. The fact that the kernel uses unsigned int values for those is not an issue as 1. one can't create so many interfaces anyway and 2. we otherwise handle those values transparently. Fix a botched conditional in conf_print() to actually skip printing DHCPv6 information if DHCPv6 is disabled (and skip printing NDP information if NDP is disabled). Link: https://github.com/containers/podman/issues/24614 Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- v2: - drop fixed link-local address for IPv6 - change addresses to be reminiscent of libslirp's default choices - add man page changes and commit message - fix several things around, from testing (checked with several --map-guest-addr and --map-host-loopback combinations etc.) conf.c | 92 +++++++++++++++++++++++++++++++++++++++++++++------------ passt.1 | 33 +++++++++++++++++---- passt.h | 8 ++--- pasta.c | 7 +++-- tap.c | 3 ++ 5 files changed, 113 insertions(+), 30 deletions(-) diff --git a/conf.c b/conf.c index 86566db..551c2b0 100644 --- a/conf.c +++ b/conf.c @@ -48,6 +48,20 @@ #define NETNS_RUN_DIR "/run/netns" +#define IP4_LL_GUEST_ADDR (struct in_addr){ htonl_constant(0xa9fe0201) } + /* 169.254.2.1, libslirp default: 10.0.2.1 */ + +#define IP4_LL_GUEST_GW (struct in_addr){ htonl_constant(0xa9fe0202) } + /* 169.254.2.2, libslirp default: 10.0.2.2 */ + +#define IP4_LL_PREFIX_LEN 16 + +#define IP6_LL_GUEST_GW (struct in6_addr) \ + {{{ 0xfe, 0x80, 0, 0, 0, 0, 0, 0, \ + 0, 0, 0, 0, 0, 0, 0, 0x01 }}} + +const char *pasta_default_ifn = "tap0"; + /** * next_chunk - Return the next piece of a string delimited by a character * @s: String to search @@ -631,7 +645,7 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4) ifi = nl_get_ext_if(nl_sock, AF_INET); if (!ifi) { - info("Couldn't pick external interface: disabling IPv4"); + debug("Failed to detect external interface for IPv4"); return 0; } @@ -639,8 +653,8 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4) int rc = nl_route_get_def(nl_sock, ifi, AF_INET, &ip4->guest_gw); if (rc < 0) { - err("Couldn't discover IPv4 gateway address: %s", - strerror(-rc)); + debug("Couldn't discover IPv4 gateway address: %s", + strerror(-rc)); return 0; } } @@ -649,8 +663,8 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4) int rc = nl_addr_get(nl_sock, ifi, AF_INET, &ip4->addr, &ip4->prefix_len, NULL); if (rc < 0) { - err("Couldn't discover IPv4 address: %s", - strerror(-rc)); + debug("Couldn't discover IPv4 address: %s", + strerror(-rc)); return 0; } } @@ -677,6 +691,19 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4) return ifi; } +/** + * conf_ip4_local() - Configure IPv4 addresses and attributes for local mode + * @ip4: IPv4 context (will be written) + */ +static void conf_ip4_local(struct ip4_ctx *ip4) +{ + ip4->addr_seen = ip4->addr = IP4_LL_GUEST_ADDR; + ip4->our_tap_addr = ip4->guest_gw = IP4_LL_GUEST_GW; + ip4->prefix_len = IP4_LL_PREFIX_LEN; + + ip4->no_copy_addrs = ip4->no_copy_routes = true; +} + /** * conf_ip6() - Verify or detect IPv6 support, get relevant addresses * @ifi: Host interface to attempt (0 to determine one) @@ -693,15 +720,15 @@ static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6) ifi = nl_get_ext_if(nl_sock, AF_INET6); if (!ifi) { - info("Couldn't pick external interface: disabling IPv6"); + debug("Failed to detect external interface for IPv6"); return 0; } if (IN6_IS_ADDR_UNSPECIFIED(&ip6->guest_gw)) { rc = nl_route_get_def(nl_sock, ifi, AF_INET6, &ip6->guest_gw); if (rc < 0) { - err("Couldn't discover IPv6 gateway address: %s", - strerror(-rc)); + debug("Couldn't discover IPv6 gateway address: %s", + strerror(-rc)); return 0; } } @@ -710,7 +737,7 @@ static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6) IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ? &ip6->addr : NULL, &prefix_len, &ip6->our_tap_ll); if (rc < 0) { - err("Couldn't discover IPv6 address: %s", strerror(-rc)); + debug("Couldn't discover IPv6 address: %s", strerror(-rc)); return 0; } @@ -726,6 +753,17 @@ static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6) return ifi; } +/** + * conf_ip6_local() - Configure IPv6 addresses and attributes for local mode + * @ip6: IPv6 context (will be written) + */ +static void conf_ip6_local(struct ip6_ctx *ip6) +{ + ip6->our_tap_ll = ip6->guest_gw = IP6_LL_GUEST_GW; + + ip6->no_copy_addrs = ip6->no_copy_routes = true; +} + /** * usage() - Print usage, exit with given status code * @name: Executable name @@ -948,12 +986,14 @@ static void conf_print(const struct ctx *c) char bufmac[ETH_ADDRSTRLEN], ifn[IFNAMSIZ]; int i; - info("Template interface: %s%s%s%s%s", - c->ifi4 ? if_indextoname(c->ifi4, ifn) : "", - c->ifi4 ? " (IPv4)" : "", - (c->ifi4 && c->ifi6) ? ", " : "", - c->ifi6 ? if_indextoname(c->ifi6, ifn) : "", - c->ifi6 ? " (IPv6)" : ""); + if (c->ifi4 > 0 || c->ifi6 > 0) { + info("Template interface: %s%s%s%s%s", + c->ifi4 > 0 ? if_indextoname(c->ifi4, ifn) : "", + c->ifi4 > 0 ? " (IPv4)" : "", + (c->ifi4 && c->ifi6) ? ", " : "", + c->ifi6 > 0 ? if_indextoname(c->ifi6, ifn) : "", + c->ifi6 > 0 ? " (IPv6)" : ""); + } if (*c->ip4.ifname_out || *c->ip6.ifname_out) { info("Outbound interface: %s%s%s%s%s", @@ -1024,9 +1064,9 @@ static void conf_print(const struct ctx *c) if (!c->no_ndp && !c->no_dhcpv6) info("NDP/DHCPv6:"); - else if (!c->no_ndp) - info("DHCPv6:"); else if (!c->no_dhcpv6) + info("DHCPv6:"); + else if (!c->no_ndp) info("NDP:"); else goto dns6; @@ -1735,8 +1775,20 @@ void conf(struct ctx *c, int argc, char **argv) c->ifi6 = conf_ip6(ifi6, &c->ip6); if ((!c->ifi4 && !c->ifi6) || (*c->ip4.ifname_out && !c->ifi4) || - (*c->ip6.ifname_out && !c->ifi6)) - die("External interface not usable"); + (*c->ip6.ifname_out && !c->ifi6)) { + info("No external interface as template, switch to local mode"); + + conf_ip4_local(&c->ip4); + c->ifi4 = -1; + + conf_ip6_local(&c->ip6); + c->ifi6 = -1; + + if (!*c->pasta_ifn) { + strncpy(c->pasta_ifn, pasta_default_ifn, + sizeof(c->pasta_ifn) - 1); + } + } if (c->ifi4 && !no_map_gw && IN4_IS_ADDR_UNSPECIFIED(&c->ip4.map_host_loopback)) @@ -1840,6 +1892,8 @@ 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)) { + c->no_dhcpv6 = 1; } if (!c->mtu) diff --git a/passt.1 b/passt.1 index f084978..f5cf8a4 100644 --- a/passt.1 +++ b/passt.1 @@ -160,7 +160,9 @@ once for IPv6). By default, assigned IPv4 and IPv6 addresses are taken from the host interfaces with the first default route, if any, for the corresponding IP version. If no default routes are available and there is any interface with any route for a -given IP version, the first of these interfaces will be chosen instead. +given IP version, the first of these interfaces will be chosen instead. If no +such interface exists, the link-local address 169.254.2.1 is assigned for IPv4, +and no additional address will be assigned for IPv6. .TP .BR \-n ", " \-\-netmask " " \fImask @@ -188,7 +190,9 @@ first default route, if any, for the corresponding IP version. If the default route is a multipath one, the gateway is the first nexthop router returned by the kernel which has the highest weight in the set of paths. If no default routes are available and there is just one interface with any route, that -interface will be chosen instead. +interface will be chosen instead. If no such interface exists, the link-local +address 169.254.2.2 is used for IPv4, and the link-local address fe80::1 is used +for IPv6. Note: these addresses are also used as source address for packets directed to the guest or to the target namespace having a loopback or local source address, @@ -203,7 +207,9 @@ Default is to use the interfaces specified by \fB--outbound-if4\fR and If no interfaces are given, the interface with the first default routes for each IP version is selected. If no default routes are available and there is just one -interface with any route, that interface will be chosen instead. +interface with any route, that interface will be chosen instead. If no such +interface exists, host interfaces will be ignored for the purposes of assigning +addresses and routes, and link-local addresses will be used instead. .TP .BR \-o ", " \-\-outbound " " \fIaddr @@ -222,7 +228,8 @@ derive IPv4 addresses and routes. By default, the interface given by the default route is selected. If no default routes are available and there is just one interface with any route, that -interface will be chosen instead. +interface will be chosen instead. If no such interface exists, outbound sockets +will not be bound to any specific interface. .TP .BR \-\-outbound-if6 " " \fIname @@ -232,7 +239,8 @@ derive IPv6 addresses and routes. By default, the interface given by the default route is selected. If no default routes are available and there is just one interface with any route, that -interface will be chosen instead. +interface will be chosen instead. If no such interface exists, outbound sockets +will not be bound to any specific interface. .TP .BR \-D ", " \-\-dns " " \fIaddr @@ -504,6 +512,7 @@ Default is \fBnone\fR. .BR \-I ", " \-\-ns-ifname " " \fIname Name of tap interface to be created in target namespace. By default, the same interface name as the external, routable interface is used. +If no such interface exists, the name \fItap0\fR will be used instead. .TP .BR \-t ", " \-\-tcp-ports " " \fIspec @@ -1032,6 +1041,20 @@ If the sending window cannot be queried, it will always be announced as the current sending buffer size to guest or target namespace. This might affect throughput of TCP connections. +.SS Local mode for disconnected setups + +If \fBpasst\fR and \fBpasta\fR fail to find a host interface with a configured +address, other than loopback addresses, they will, obviously, not attempt to +source addresses or routes from the host. + +In this case, unless configured otherwise, they will assign the IPv4 link-local +address 169.254.2.1 to the guest or target namespace, and no IPv6 address. The +notion of the guest or target namespace IPv6 address is derived from the first +link-local address observed. + +Default gateways will be assigned as the link-local address 169.254.2.2 for +IPv4, and as the link-local address fe80::1 for IPv6. + .SH LIMITATIONS Currently, IGMP/MLD proxying (RFC 4605) and support for SCTP (RFC 4960) are not diff --git a/passt.h b/passt.h index 72c7f72..799ee50 100644 --- a/passt.h +++ b/passt.h @@ -202,10 +202,10 @@ struct ip6_ctx { * @our_tap_mac: Pasta/passt's MAC on the tap link * @guest_mac: MAC address of guest or namespace, seen or configured * @hash_secret: 128-bit secret for siphash functions - * @ifi4: Index of template interface for IPv4, 0 if IPv4 disabled + * @ifi4: Template interface for IPv4, -1: none, 0: IPv4 disabled * @ip: IPv4 configuration * @dns_search: DNS search list - * @ifi6: Index of template interface for IPv6, 0 if IPv6 disabled + * @ifi6: Template interface for IPv6, -1: none, 0: IPv6 disabled * @ip6: IPv6 configuration * @pasta_ifn: Name of namespace interface for pasta * @pasta_ifi: Index of namespace interface for pasta @@ -258,12 +258,12 @@ struct ctx { unsigned char guest_mac[ETH_ALEN]; uint64_t hash_secret[2]; - unsigned int ifi4; + int ifi4; struct ip4_ctx ip4; struct fqdn dns_search[MAXDNSRCH]; - unsigned int ifi6; + int ifi6; struct ip6_ctx ip6; char pasta_ifn[IF_NAMESIZE]; diff --git a/pasta.c b/pasta.c index a117704..96dacc3 100644 --- a/pasta.c +++ b/pasta.c @@ -369,8 +369,11 @@ void pasta_ns_conf(struct ctx *c) 0, IFF_NOARP); if (c->ip6.no_copy_addrs) { - rc = nl_addr_set(nl_sock_ns, c->pasta_ifi, - AF_INET6, &c->ip6.addr, 64); + if (!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr)) { + rc = nl_addr_set(nl_sock_ns, + c->pasta_ifi, AF_INET6, + &c->ip6.addr, 64); + } } else { rc = nl_addr_dup(nl_sock, c->ifi6, nl_sock_ns, c->pasta_ifi, diff --git a/tap.c b/tap.c index 14d9b3d..5347df4 100644 --- a/tap.c +++ b/tap.c @@ -803,6 +803,9 @@ resume: if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr_seen)) { c->ip6.addr_seen = *saddr; } + + if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr)) + c->ip6.addr = *saddr; } else if (!IN6_IS_ADDR_UNSPECIFIED(saddr)){ c->ip6.addr_seen = *saddr; } -- 2.43.0

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[PATCH v3 0/3] dhcp: Add support for Rapid Commit, broadcast replies
by Stefano Brivio 26 Nov '24

26 Nov '24

These are all changes coming from pending muvm experiments where I'm trying to speed up and simplify the networking setup in the guest. v3: In 1/3, set 'slen' for options we won't send to -1 in dhcp_init(), and reset it for option 80 every time we handle a DHCP request. Add a comment about DHCP needing a valid message type (option 53) v2: In 3/3, add in4addr_broadcast to ip.h, instead of open-coding it in dhcp() Stefano Brivio (3): dhcp: Use -1 as "missing option" length instead of 0 dhcp: Introduce support for Rapid Commit (option 80, RFC 4039) dhcp: Honour broadcast flag (RFC 2131, 4.1) dhcp.c | 51 ++++++++++++++++++++++++++++++++++++++++----------- ip.h | 3 +++ 2 files changed, 43 insertions(+), 11 deletions(-) -- 2.43.0

2 6

[PATCH] test/perf: Select a single IPv6 namespace address in pasta tests
by Stefano Brivio 26 Nov '24

26 Nov '24

By dropping the filter on prefix length, commit 910f4f910301 ("test: Don't require 64-bit prefixes in perf tests") broke tests on setups where two global unicast IPv6 addresses are available, which is the typical case when the "host" is a VM running under passt with addresses from SLAAC and DHCPv6, because two addresses will be returned. Pick the first one instead. We don't really care about the prefix length, any of these addresses will work. Fixes: 910f4f910301 ("test: Don't require 64-bit prefixes in perf tests") Link: https://archives.passt.top/passt-dev/20241119214344.6b4a5b3a@elisabeth/ Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- test/perf/pasta_tcp | 2 +- test/perf/pasta_udp | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/test/perf/pasta_tcp b/test/perf/pasta_tcp index 88284b2..bc0de3c 100644 --- a/test/perf/pasta_tcp +++ b/test/perf/pasta_tcp @@ -211,7 +211,7 @@ tr TCP throughput over IPv6: host to ns iperf3s ns 10002 nsout IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname' -nsout ADDR6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global").local' +nsout ADDR6 ip -j -6 addr show|jq -rM '[.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global").local] | .[0]' bw - bw - bw - diff --git a/test/perf/pasta_udp b/test/perf/pasta_udp index 3d07091..ab2f3e8 100644 --- a/test/perf/pasta_udp +++ b/test/perf/pasta_udp @@ -196,7 +196,7 @@ tr UDP throughput over IPv6: host to ns iperf3s ns 10002 nsout IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname' -nsout ADDR6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global").local' +nsout ADDR6 ip -j -6 addr show|jq -rM '[.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global").local] | .[0]' iperf3 BW host __ADDR6__ 10002 __TIME__ __OPTS__ -b 8G -l 1472 bw __BW__ 0.3 0.5 iperf3 BW host __ADDR6__ 10002 __TIME__ __OPTS__ -b 12G -l 3972 -- 2.43.0

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[PATCH] conf, passt.1: Update --mac-addr default in usage() and man page
by Stefano Brivio 26 Nov '24

26 Nov '24

Fixes: 90e83d50a9bd ("Don't take "our" MAC address from the host") Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- conf.c | 2 +- passt.1 | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/conf.c b/conf.c index 551c2b0..3a84669 100644 --- a/conf.c +++ b/conf.c @@ -826,7 +826,7 @@ static void usage(const char *name, FILE *f, int status) " -n, --netmask MASK Assign IPv4 MASK, dot-decimal or bits\n" " default: netmask from matching address on the host\n" " -M, --mac-addr ADDR Use source MAC address ADDR\n" - " default: MAC address from interface with default route\n" + " default: 9a:55:9a:55:9a:55 (locally administered)\n" " -g, --gateway ADDR Pass IPv4 or IPv6 address as gateway\n" " default: gateway from interface with default route\n" " -i, --interface NAME Interface for addresses and routes\n" diff --git a/passt.1 b/passt.1 index 8d1d860..15c8338 100644 --- a/passt.1 +++ b/passt.1 @@ -176,8 +176,7 @@ according to the CIDR block of the assigned address (RFC 4632). .BR \-M ", " \-\-mac-addr " " \fIaddr Use source MAC address \fIaddr\fR when communicating to the guest or to the target namespace. -Default is to use the MAC address of the interface with the first IPv4 default -route on the host. +Default is the locally administered MAC addresses 9a:55:9a:55:9a:55. .TP .BR \-g ", " \-\-gateway " " \fIaddr -- 2.43.0

2 1

[PATCH] passt.1: Fix "default" note about --map-guest-addr
by Stefano Brivio 26 Nov '24

26 Nov '24

It's not true that there's no mapping by default: there's no mapping in the --map-guest-addr sense, by default, but in that case the default --map-host-loopback behaviour prevails. While at it, fix a typo. Fixes: 57b7bd2a48a1 ("fwd, conf: Allow NAT of the guest's assigned address") Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- passt.1 | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/passt.1 b/passt.1 index f5cf8a4..8d1d860 100644 --- a/passt.1 +++ b/passt.1 @@ -381,14 +381,14 @@ Translate \fIaddr\fR in the guest to be equal to the guest's assigned address on the host. That is, packets from the guest to \fIaddr\fR will be redirected to the address assigned to the guest with \fB-a\fR, or by default the host's global address. This allows the guest to -access services availble on the host's global address, even though its +access services available on the host's global address, even though its own address shadows that of the host. If \fIaddr\fR is 'none', no address is mapped. Only one IPv4 and one IPv6 address can be translated, and if the option is specified multiple times, the last one for each address type takes effect. -Default is no mapping. +By default, mapping happens as described for the \-\-map-host-loopback option. .TP .BR \-4 ", " \-\-ipv4-only -- 2.43.0

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[PATCH 0/3] dhcp: Add support for Rapid Commit, broadcast replies
by Stefano Brivio 25 Nov '24

25 Nov '24

These are all changes coming from pending muvm experiments where I'm trying to speed up and simplify the networking setup in the guest. Stefano Brivio (3): dhcp: Use -1 as "missing option" length instead of 0 dhcp: Introduce support for Rapid Commit (option 80, RFC 4039) dhcp: Honour broadcast flag (RFC 2131, 4.1) dhcp.c | 49 ++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 38 insertions(+), 11 deletions(-) -- 2.43.0

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