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* tap: use in->buf_size rather than sizeof(pkt_buf)Laurent Vivier2024-06-131-5/+5
| | | | | | | | | | | | buf_size is set to sizeof(pkt_buf) by default. And it seems more correct to provide the actual size of the buffer. Later a buf_size of 0 will allow vhost-user mode to detect guest memory buffers. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* vhost-user: compare mode MODE_PASTA and not MODE_PASSTLaurent Vivier2024-06-131-6/+6
| | | | | | | | | | As we are going to introduce the MODE_VU that will act like the mode MODE_PASST, compare to MODE_PASTA rather than to add a comparison to MODE_VU when we check for MODE_PASST. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: refactor packets handling functionsLaurent Vivier2024-06-131-49/+61
| | | | | | | | | | | | | Consolidate pool_tap4() and pool_tap6() into tap_flush_pools(), and tap4_handler() and tap6_handler() into tap_handler(). Create a generic tap_add_packet() to consolidate packet addition logic and reduce code duplication. The purpose is to ease the export of these functions to use them with the vhost-user backend. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* clang-tidy: Enable the bugprone-macro-parentheses checkDavid Gibson2024-06-071-18/+19
| | | | | | | | | | | | | | | | We globally disabled this, with a justification lumped together with several checks about braces. They don't really go together, the others are essentially a stylistic choice which doesn't match our style. Omitting brackets on macro parameters can lead to real and hard to track down bugs if an expression is ever passed to the macro instead of a plain identifier. We've only gotten away with the macros which trigger the warning, because of other conventions its been unlikely to invoke them with anything other than a simple identifier. Fix the macros, and enable the warning for the future. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf, passt, tap: Open socket and PID files before switching UID/GIDStefano Brivio2024-05-231-4/+3
| | | | | | | | | | | | Otherwise, if the user runs us as root, and gives us paths that are only accessible by root, we'll fail to open them, which might in turn encourage users to change permissions or ownerships: definitely a bad idea in terms of security. Reported-by: Minxi Hou <mhou@redhat.com> Reported-by: Richard W.M. Jones <rjones@redhat.com> Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Acked-by: Richard W.M. Jones <rjones@redhat.com>
* tap: Split tap_sock_unix_init() into opening and listening partsStefano Brivio2024-05-231-12/+27
| | | | | | | | | We'll need to open and bind the socket a while before listening to it, so split that into two different functions. No functional changes intended. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
* passt, tap: Don't use -1 as uninitialised value for fd_tap_listenStefano Brivio2024-05-231-2/+1
| | | | | | | | | | | | | | This is a remnant from the time we kept access to the original filesystem and we could reinitialise the listening AF_UNIX socket. Since commit 0515adceaa8f ("passt, pasta: Namespace-based sandboxing, defer seccomp policy application"), however, we can't re-bind the listening socket once we're up and running. Drop the -1 initalisation and the corresponding check. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* tap: Move all-ones initialisation of mac_guest to tap_sock_init()Stefano Brivio2024-05-231-6/+6
| | | | | | | | | | | | | | | It has nothing to do with tap_sock_unix_init(). It used to be there as that function could be called multiple times per passt instance, but it's not the case anymore. This also takes care of the fact that, with --fd, we wouldn't set the initial MAC address, so we would need to wait for the guest to send us an ARP packet before we could exchange data. Fixes: 6b4e68383c66 ("passt, tap: Add --fd option") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Acked-by: Richard W.M. Jones <rjones@redhat.com>
* iov: Helper macro to construct iovs covering existing variables or fieldsDavid Gibson2024-05-021-2/+1
| | | | | | | | | | | Laurent's recent changes mean we use IO vectors much more heavily in the TCP code. In many of those cases, and few others around the code base, individual iovs of these vectors are constructed to exactly cover existing variables or fields. We can make initializing such iovs shorter and clearer with a macro for the purpose. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* treewide: Standardise variable names for various packet lengthsDavid Gibson2024-05-021-68/+69
| | | | | | | | | | | | | | | | | | At various points we need to track the lengths of a packet including or excluding various different sets of headers. We don't always use the same variable names for doing so. Worse in some places we use the same name for different things: e.g. tcp_fill_headers[46]() use ip_len for the length including the IP headers, but then tcp_send_flag() which calls it uses it to mean the IP payload length only. To improve clarity, standardise on these names: dlen: L4 protocol payload length ("data length") l4len: plen + length of L4 protocol header l3len: l4len + length of IPv4/IPv6 header l2len: l3len + length of L2 (ethernet) header Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* checksum: Make csum_ip4_header() take a host endian lengthDavid Gibson2024-05-021-2/+4
| | | | | | | | | | | | | | csum_ip4_header() takes the packet length as a network endian value. In general it's very error-prone to pass non-native-endian values as a raw integer. It's particularly bad here because this differs from other checksum functions (e.g. proto_ipv4_header_psum()) which take host native lengths. It turns out all the callers have easy access to the native endian value, so switch it to use host order like everything else. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* treewide: Remove misleading and redundant endianness notesDavid Gibson2024-05-021-3/+3
| | | | | | | | | | | | | | | In general, it's much less error-prone to have the endianness of values implied by the type, rather than just noting it in comments. We can't always easily avoid it, because C, but we can do so when possible. struct in_addr and in6_addr are always encoded network endian, so noting it explicitly isn't useful. Remove them. In some cases we also have endianness notes on uint8_t parameters, which doesn't make sense: for a single byte endianness is irrelevant. Remove those too. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Implement tap_send() "slow path" in terms of fast pathDavid Gibson2024-03-141-21/+17
| | | | | | | | | | | | | | | | Most times we send frames to the guest it goes via tap_send_frames(). However "slow path" protocols - ARP, ICMP, ICMPv6, DHCP and DHCPv6 - go via tap_send(). As well as being a semantic duplication, tap_send() contains at least one serious problem: it doesn't properly handle short sends, which can be fatal on the qemu socket connection, since frame boundaries will get out of sync. Rewrite tap_send() to call tap_send_frames(). While we're there, rename it tap_send_single() for clarity. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Simplify some casts in the tap "slow path" functionsDavid Gibson2024-03-141-23/+18
| | | | | | | | We can both remove some variables which differ from others only in type, and slightly improve type safety. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Extend tap_send_frames() to allow multi-buffer framesDavid Gibson2024-03-141-31/+52
| | | | | | | | | | | tap_send_frames() takes a vector of buffers and requires exactly one frame per buffer. We have future plans where we want to have multiple buffers per frame in some circumstances, so extend tap_send_frames() to take the number of buffers per frame as a parameter. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: Improve comment to rembufs calculation] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Capture only packets that are actually sentLaurent Vivier2024-03-131-1/+1
| | | | | | | | | | | In tap_send_frames(), if we failed to send all the frames, we must only log the frames that have been sent, not all the frames we wanted to send. Fixes: dda7945ca9c9 ("pcap: Handle short writes in pcap_frame()") Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: make tap_update_mac() genericLaurent Vivier2024-03-061-5/+5
| | | | | | | | | | Use ethhdr rather than tap_hdr. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Message-ID: <20240303135114.1023026-9-lvivier@redhat.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* checksum: use csum_ip4_header() in udp.c and tcp.cLaurent Vivier2024-03-061-1/+1
| | | | | | | | | | | | | | | | | We can find the same function to compute the IPv4 header checksum in tcp.c, udp.c and tap.c Use the function defined for tap.c, csum_ip4_header(), but with the code used in tcp.c and udp.c as it doesn't need a fully initialiazed IPv4 header, only protocol, tot_len, saddr and daddr. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Message-ID: <20240303135114.1023026-7-lvivier@redhat.com> [dwg: Fix weird cppcheck regression; it appears to be a problem in pre-existing code, but somehow this patch is exposing it] Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* util: move IP stuff from util.[ch] to ip.[ch]Laurent Vivier2024-03-061-0/+1
| | | | | | | | | | | | Introduce ip.[ch] file to encapsulate IP protocol handling functions and structures. Modify various files to include the new header ip.h when it's needed. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Message-ID: <20240303135114.1023026-5-lvivier@redhat.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Disallow loopback addresses on tap interfaceDavid Gibson2024-02-291-0/+19
| | | | | | | | | | | | | The "tap" interface, whether it's actually a tuntap device or a qemu socket, presents a virtual external link between different network hosts. Hence, loopback addresses make no sense there. However, nothing prevents the guest from putting bogus packets with loopback addresses onto the interface and it's not entirely clear what effect that will have on passt. Explicitly test for such packets and drop them. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Use write_remainder() in tap_send_frames_passt()David Gibson2024-02-291-25/+4
| | | | | | | | | | | | | When we determine we have sent a partial frame in tap_send_frames_passt(), we call tap_send_remainder() to send the remainder of it. The logic in that function is very similar to that in the more general write_remainder() except that it uses send() instead of write()/writev(). But we are dealing specifically with the qemu socket here, which is a connected stream socket. In that case write()s do the same thing as send() with the options we were using, so we can just reuse write_remainder(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* pcap: Handle short writes in pcap_frame()David Gibson2024-02-291-1/+1
| | | | | | | | | | | | | | | Currently pcap_frame() assumes that if write() doesn't return an error, it has written everything we want. That's not necessarily true, because it could return a short write. That's not likely to happen on a regular file, but there's not a lot of reason not to be robust here; it's conceivable we might want to direct the pcap fd at a named pipe or similar. So, make pcap_frame() handle short frames by using the write_remainder() helper. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: Formatting fix, and avoid gcc warning in pcap_frame()] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* iov: Add helper to find skip over first n bytes of an io vectorDavid Gibson2024-02-291-7/+5
| | | | | | | | | Several of the IOV functions in iov.c, and also tap_send_frames_passt() needs to determine which buffer element a byte offset into an IO vector lies in. Split this out into a helper function iov_skip_bytes(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* treewide: Make a bunch of pointer variables pointers to constDavid Gibson2024-01-161-6/+6
| | | | | | | | | | Sufficiently recent cppcheck (I'm using 2.13.0) seems to have added another warning for pointer variables which could be pointer to const but aren't. Use this to make a bunch of variables const pointers where they previously weren't for no particular reason. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* treewide: Use 'z' length modifier for size_t/ssize_t conversionsStefano Brivio2023-12-021-6/+6
| | | | | | | | Types size_t and ssize_t are not necessarily long, it depends on the architecture. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* tap, pasta: Handle short writes to /dev/tap2023_11_10.5ec3634David Gibson2023-11-101-1/+7
| | | | | | | | | | | | | | | tap_send_frames_pasta() sends frames to the namespace by sending them to our the /dev/tap device. If that write() returns an error, we already handle it. However we don't handle the case where the write() returns short, meaning we haven't successfully transmitted the whole frame. I don't know if this can ever happen with the kernel tap device, but we should at least report the case so we don't get a cryptic failure. For the purposes of the return value for tap_send_frames_pasta() we treat this case as though it was an error (on the grounds that a partial frame is no use to the namespace). Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tap, pasta: Handle incomplete tap sends for pasta tooDavid Gibson2023-11-101-3/+1
| | | | | | | | | | | | | | | | | | | | Since a469fc39 ("tcp, tap: Don't increase tap-side sequence counter for dropped frames") we've handled more gracefully the case where we get data from the socket side, but are temporarily unable to send it all to the tap side (e.g. due to full buffers). That code relies on tap_send_frames() returning the number of frames it successfully sent, which in turn gets it from tap_send_frames_passt() or tap_send_frames_pasta(). While tap_send_frames_passt() has returned that information since b62ed9ca ("tap: Don't pcap frames that didn't get sent"), tap_send_frames_pasta() always returns as though it succesfully sent every frame. However there certainly are cases where it will return early without sending all frames. Update it report that properly, so that the calling functions can handle it properly. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* pif: Pass originating pif to tap handler functionsDavid Gibson2023-11-071-10/+16
| | | | | | | | | | | For now, packets passed to the various *_tap_handler() functions always come from the single "tap" interface. We want to allow the possibility to broaden that in future. As preparation for that, have the code in tap.c pass the pif id of the originating interface to each of those handler functions. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tcp, tap: Don't increase tap-side sequence counter for dropped framesStefano Brivio2023-10-041-3/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | ...so that we'll retry sending them, instead of more-or-less silently dropping them. This happens quite frequently if our sending buffer on the UNIX domain socket is heavily constrained (for instance, by the 208 KiB default memory limit). It might be argued that dropping frames is part of the expected TCP flow: we don't dequeue those from the socket anyway, so we'll eventually retransmit them. But we don't need the receiver to tell us (by the way of duplicate or missing ACKs) that we couldn't send them: we already know as sendmsg() reports that. This seems to considerably increase throughput stability and throughput itself for TCP connections with default wmem_max values. Unfortunately, the 16 bits left as padding in the frame descriptors we use internally aren't enough to uniquely identify for which connection we should update sequence numbers: create a parallel array of pointers to sequence numbers and L4 lengths, of TCP_FRAMES_MEM size, and go through it after calling sendmsg(). Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* cppcheck: Make many pointers constDavid Gibson2023-10-041-7/+7
| | | | | | | | | Newer versions of cppcheck (as of 2.12.0, at least) added a warning for pointers which could be declared to point at const data, but aren't. Based on that, make many pointers throughout the codebase const. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* udp, tap: Correctly advance through packets in udp_tap_handler()David Gibson2023-09-081-12/+8
| | | | | | | | | | | | | | | | | | In both tap4_handler() and tap6_handler(), once we've sorted incoming l3 packets into "sequences", we then step through all the packets in each DUP sequence calling udp_tap_handler(). Or so it appears. In fact, udp_tap_handler() doesn't take an index and always starts with packet 0 of the sequence, even if called repeatedly. It appears to be written with the idea that the struct pool is a queue, from which it consumes packets as it processes them, but that's not how the pool data structure works. Correct this by adding an index parameter to udp_tap_handler() and altering the loops in tap.c to step through the pool properly. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tcp, tap: Correctly advance through packets in tcp_tap_handler()David Gibson2023-09-081-8/+17
| | | | | | | | | | | | | | | | | | | | | | | | | In both tap4_handler() and tap6_handler(), once we've sorted incoming l3 packets into "sequences", we then step through all the packets in each TCP sequence calling tcp_tap_handler(). Or so it appears. In fact, tcp_tap_handler() doesn't take an index and always looks at packet 0 of the sequence, except when it calls tcp_data_from_tap() to process data packets. It appears to be written with the idea that the struct pool is a queue, from which it consumes packets as it processes them, but that's not how the pool data structure works - they are more like an array of packets. We only get away with this, because setup packets for TCP tend to come in separate batches (because we need to reply in between) and so we only get a bunch of packets for the same connection together when they're data packets (tcp_data_from_tap() has its own loop through packets). Correct this by adding an index parameter to tcp_tap_handler() and altering the loops in tap.c to step through the pool properly. Link: https://bugs.passt.top/show_bug.cgi?id=68 Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: fix uses of l3_len in tap4_handler()Stas Sergeev2023-09-071-2/+2
| | | | | | | | | | | | | | | | | l3_len was calculated from the ethernet frame size, and it was assumed to be equal to the length stored in an IP packet. But if the ethernet frame is padded, then l3_len calculated that way can only be used as a bound check to validate the length stored in an IP header. It should not be used for calculating the l4_len. This patch makes sure the small padded ethernet frames are properly processed, by trusting the length stored in an IP header. Link: https://bugs.passt.top/show_bug.cgi?id=73 Signed-off-by: Stas Sergeev <stsp2@yandex.ru> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tcp, udp: Don't pre-fill IPv4 destination address in headersDavid Gibson2023-08-221-5/+3
| | | | | | | | | | | | | | | | | Because packets sent on the tap interface will always be going to the guest/namespace, we more-or-less know what address they'll be going to. So we pre-fill this destination address in our header buffers for IPv4. We can't do the same for IPv6 because we could need either the global or link-local address for the guest. In future we're going to want more flexibility for the destination address, so this pre-filling will get in the way. Change the flow so we always fill in the IPv4 destination address for each packet, rather than prefilling it from proto_update_l2_buf(). In fact for TCP we already redundantly filled the destination for each packet anyway. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Pass source address to protocol handler functionsDavid Gibson2023-08-221-8/+11
| | | | | | | | | | | The tap code passes the IPv4 or IPv6 destination address of packets it receives to the protocol specific code. Currently that protocol code doesn't use the source address, but we want it to in future. So, in preparation, pass the IPv4/IPv6 source address of tap packets to those functions as well. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Don't clobber source address in tap6_handler()David Gibson2023-08-221-2/+0
| | | | | | | | | | | | | | In tap6_handler() saddr is initialized to the IPv6 source address from the incoming packet. However part way through, but before organizing the packet into a "sequence" we set it unconditionally to the guest's assigned address. We don't do anything equivalent for IPv4. This doesn't make a lot of sense: if the guest is using a different source address it makes sense to consider these different sequences of packets and we shouldn't try to combine them together. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Fix format specifier in tap4_is_fragment() warningStefano Brivio2023-08-161-1/+2
| | | | | | | | Spotted by Coverity, relatively harmless. Fixes: e01759e2fab0 ("tap: Explicitly drop IPv4 fragments, and give a warning") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* epoll: Use different epoll types for passt and pasta tap fdsDavid Gibson2023-08-131-24/+15
| | | | | | | | | | | Currently we have a single epoll event type for the "tap" fd, which could be either a handle on a /dev/net/tun device (pasta) or a connected Unix socket (passt). However for the two modes we call different handler functions. Simplify this a little by using different epoll types and dispatching directly to the correct handler function. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* epoll: Split listening Unix domain socket into its own typeDavid Gibson2023-08-131-11/+4
| | | | | | | | | | | | | tap_handler() actually handles events on three different types of object: the /dev/tap character device (pasta), a connected Unix domain socket (passt) or a listening Unix domain socket (passt). The last, in particular, really has no handling in common with the others, so split it into its own epoll type and directly dispatch to the relevant handler from the top level. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* epoll: Always use epoll_ref for the epoll data variableDavid Gibson2023-08-131-4/+12
| | | | | | | | | | | | | | | | | | | | | | epoll_ref contains a variety of information useful when handling epoll events on our sockets, and we place it in the epoll_event data field returned by epoll. However, for a few other things we use the 'fd' field in the standard union of types for that data field. This actually introduces a bug which is vanishingly unlikely to hit in practice, but very nasty if it ever did: theoretically if we had a very large file descriptor number for fd_tap or fd_tap_listen it could overflow into bits that overlap with the 'proto' field in epoll_ref. With some very bad luck this could mean that we mistakenly think an event on a regular socket is an event on fd_tap or fd_tap_listen. More practically, using different (but overlapping) fields of the epoll_data means we can't unify dispatch for the various different objects in the epoll. Therefore use the same epoll_ref as the data for the tap fds and the netns quit fd, adding new fd type values to describe them. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Fold reset handling into tap_handler_passt()David Gibson2023-08-131-36/+32
| | | | | | | | | | | We call tap_sock_reset() if tap_handler_passt() fails, or if we get an error event on the socket. Fold that logic into tap_handler() passt itself which simplifies the caller. It also makes it clearer that we had a redundant EPOLL_CTL_DEL and close() in one of the reset paths, so fix that too. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Fold reset handling into tap_handler_pasta()David Gibson2023-08-131-15/+15
| | | | | | | | | If tap_handler_pasta() fails, we reset the connection. But in the case of pasta the "reset" is just a fatal error. Fold the die() calls directly into tap_handler_pasta() for simplicity. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Clean up behaviour for errors on listening Unix socketDavid Gibson2023-08-131-4/+8
| | | | | | | | | | | | | | | | | | | | | We call tap_sock_unix_new() to handle a new connection to the qemu socket if we get an EPOLLIN event on c->fd_tap_listen. If we get any other event on the fd, we'll fall through to the "tap reset" path. But that won't do anything relevant to the listening socket, it will just close the already connected socket. Furthermore, the only other event we're subscribed to for the listening socket is EPOLLRDHUP, which doesn't apply to a non connected socket. Remove EPOLLRDHUP from the subscribed events. We don't need to explicitly add EPOLLERR, because errors are always reported. There's no obvious case that would cause an error on a listening socket anyway, and it's not obvious how we'd recover, treat it as a fatal error if it ever does happen. Finally, fold all this handling into the tap_sock_unix_new() function, there's no real reason to split it between there and tap_handler(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Clean up tap reset pathDavid Gibson2023-08-131-23/+29
| | | | | | | | | | | | | | | | | | | | | | In tap_handler() if we get an error on the tap device or socket, we use tap_sock_init() to re-initialise it. However, what we actually need for this reset case has remarkably little in common with the case where we're initialising for the first time: * Re-initialising the packet pools is unnecessary * The case of a passed in fd (--fd) isn't relevant * We don't even call this for pasta mode * We will never re-call tap_sock_unix_init() because we never clear fd_tap_listen In fact the only thing we do in tap_sock_init() relevant to the reset case is to remove the fd from the epoll and close it... which isn't used in the first initialisation case. So make a new tap_sock_reset() function just for this case, and simplify tap_sock_init() slightly as being used only for the first time case. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: fix seq->p.count limitLaurent Vivier2023-08-131-6/+6
| | | | | | | | | | | | | The number of items in pool_l4_t is defined to UIO_MAXIOV, not TAP_SEQS. TAP_SEQS is the number of the sequences. Fix the value used to compare seq->p.count with. Fixes: 37c228ada88b ("tap, tcp, udp, icmp: Cut down on some oversized buffers") Signed-off-by: Laurent Vivier <lvivier@redhat.com> [sbrivio: s/messages/sequences/ in commit message, extend initialisation of packets in pool to UIO_MAXIOV items] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Remove unnecessary global tun_ns_fdDavid Gibson2023-08-041-7/+3
| | | | | | | | | | | | | | tap_ns_tun(), which runs in an ephemeral thread puts the fd it opens into the global variable tun_ns_fd to communicate it back to the main thread in tap_sock_tun_init(). However, the only thing tap_sock_tun_init() does with it is copies it to c->fd_tap and everything else uses it from there. tap_ns_tun() already has access to the context structure, so we might as well store the value directly in there rather than having a global as an intermediate. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: More detailed error reporting in tap_ns_tun()David Gibson2023-08-041-9/+16
| | | | | | | | | | | | | | | | There are several possible failure points in tap_ns_tun(), but if anything goes wrong, we just set tun_ns_fd to -1 resulting in the same error message. Add more detailed error reporting to the various failure points. At the same time, we know this is only called from tap_sock_tun_init() which will terminate pasta if we fail, so we can simplify things a little because we don't need to close() the fd on the failure paths. Link: https://bugs.passt.top/show_bug.cgi?id=69 Link: https://github.com/containers/podman/issues/19428 Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* util: Make ns_enter() a void function and report setns() errorsDavid Gibson2023-08-041-2/+2
| | | | | | | | | | | | | | | | ns_enter() returns an integer... but it's always zero. If we actually fail the function doesn't return. Therefore it makes more sense for this to be a function returning void, and we can remove the cases where we pointlessly checked its return value. In addition ns_enter() is usually called from an ephemeral thread created by NS_CALL(). That means that the exit(EXIT_FAILURE) there usually won't be reported (since NS_CALL() doesn't wait() for the thread). So, use die() instead to print out some information in the unlikely event that our setns() here does fail. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: Explicitly drop IPv4 fragments, and give a warningDavid Gibson2023-07-071-0/+31
| | | | | | | | | | | | | | | | We don't handle defragmentation of IP packets coming from the tap side, and we're unlikely to any time soon (with our large MTU, it's not useful for practical use cases). Currently, however, we simply ignore the fragmentation flags and treat fragments as though they were whole IP packets. This isn't ideal and can lead to rather cryptic behaviour if we do receive IP fragments. Change the code to explicitly drop fragmented packets, and print a rate limited warning if we do encounter them. Link: https://bugs.passt.top/show_bug.cgi?id=62 Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tap: With pasta, don't reset on tap errors, handle write failuresStefano Brivio2023-06-231-5/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | Since commit 0515adceaa8f ("passt, pasta: Namespace-based sandboxing, defer seccomp policy application"), it makes no sense to close and reopen the tap device on error: we don't have access to /dev/net/tun after the initial setup phase. If we hit ENOBUFS while writing (as reported: in one case because the kernel actually ran out of memory, with another case under investigation), or ENOSPC, we're supposed to drop whatever data we were trying to send: there's no room for it. Handle EINTR just like we handled EAGAIN/EWOULDBLOCK: there's no particular reason why sending the same data should fail again. Anything else I can think of would be an unrecoverable error: exit with failure then. While at it, drop a useless cast on the write() call: it takes a const void * anyway. Reported-by: Gianluca Stivan <me@yawnt.com> Reported-by: Chris Kuhn <kuhnchris@kuhnchris.eu> Fixes: 0515adceaa8f ("passt, pasta: Namespace-based sandboxing, defer seccomp policy application") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
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