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If CLOSE_RANGE_UNSHARE isn't defined, we define a fallback version of close_range() which is a (successful) no-op. This is broken in several ways: * It doesn't actually fix compile if using old kernel headers, because the caller of close_range() still directly uses CLOSE_RANGE_UNSHARE unprotected by ifdefs * Even if it did fix the compile, it means inconsistent behaviour between a compile time failure to find the value (we silently don't close files) and a runtime failure (we die with an error from close_range()) * Silently not closing the files we intend to close for security reasons is probably not a good idea in any case We don't want to simply error if close_range() or CLOSE_RANGE_UNSHARE isn't available, because that would require running on kernel >= 5.9. On the other hand there's not really any other way to flush all possible fds leaked by the parent (close() in a loop takes over a minute). So in this case print a warning and carry on. As bonus this fixes a cppcheck error I see with some different options I'm looking to apply in future. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
145 lines
4.5 KiB
C
145 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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*
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* Declarations for Linux specific dependencies
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*/
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#ifndef LINUX_DEP_H
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#define LINUX_DEP_H
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/* struct tcp_info_linux - Information from Linux TCP_INFO getsockopt()
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*
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* Largely derived from include/linux/tcp.h in the Linux kernel
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*
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* Some fields returned by TCP_INFO have been there for ages and are shared with
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* BSD. struct tcp_info from netinet/tcp.h has only those fields. There are
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* also a many Linux specific extensions to the structure, which are only found
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* in the linux/tcp.h version of struct tcp_info.
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*
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* We want to use some of those extension fields, when available. We can test
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* for availability in the runtime kernel using the length returned from
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* getsockopt(). However, we won't necessarily be compiled against the same
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* kernel headers as we'll run with, so compiling directly against linux/tcp.h
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* means wrapping every field access in an #ifdef whose #else does the same
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* thing as when the field is missing at runtime. This rapidly gets messy.
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*
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* Instead we define here struct tcp_info_linux which includes all the Linux
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* extensions that we want to use. This is taken from v6.11 of the kernel.
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*/
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struct tcp_info_linux {
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uint8_t tcpi_state;
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uint8_t tcpi_ca_state;
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uint8_t tcpi_retransmits;
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uint8_t tcpi_probes;
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uint8_t tcpi_backoff;
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uint8_t tcpi_options;
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uint8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
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uint8_t tcpi_delivery_rate_app_limited:1, tcpi_fastopen_client_fail:2;
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uint32_t tcpi_rto;
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uint32_t tcpi_ato;
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uint32_t tcpi_snd_mss;
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uint32_t tcpi_rcv_mss;
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uint32_t tcpi_unacked;
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uint32_t tcpi_sacked;
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uint32_t tcpi_lost;
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uint32_t tcpi_retrans;
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uint32_t tcpi_fackets;
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/* Times. */
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uint32_t tcpi_last_data_sent;
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uint32_t tcpi_last_ack_sent;
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uint32_t tcpi_last_data_recv;
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uint32_t tcpi_last_ack_recv;
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/* Metrics. */
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uint32_t tcpi_pmtu;
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uint32_t tcpi_rcv_ssthresh;
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uint32_t tcpi_rtt;
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uint32_t tcpi_rttvar;
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uint32_t tcpi_snd_ssthresh;
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uint32_t tcpi_snd_cwnd;
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uint32_t tcpi_advmss;
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uint32_t tcpi_reordering;
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uint32_t tcpi_rcv_rtt;
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uint32_t tcpi_rcv_space;
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uint32_t tcpi_total_retrans;
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/* Linux extensions */
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uint64_t tcpi_pacing_rate;
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uint64_t tcpi_max_pacing_rate;
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uint64_t tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
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uint64_t tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
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uint32_t tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
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uint32_t tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
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uint32_t tcpi_notsent_bytes;
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uint32_t tcpi_min_rtt;
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uint32_t tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */
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uint32_t tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */
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uint64_t tcpi_delivery_rate;
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uint64_t tcpi_busy_time; /* Time (usec) busy sending data */
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uint64_t tcpi_rwnd_limited; /* Time (usec) limited by receive window */
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uint64_t tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
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uint32_t tcpi_delivered;
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uint32_t tcpi_delivered_ce;
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uint64_t tcpi_bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut */
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uint64_t tcpi_bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans */
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uint32_t tcpi_dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups */
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uint32_t tcpi_reord_seen; /* reordering events seen */
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uint32_t tcpi_rcv_ooopack; /* Out-of-order packets received */
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uint32_t tcpi_snd_wnd; /* peer's advertised receive window after
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* scaling (bytes)
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*/
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uint32_t tcpi_rcv_wnd; /* local advertised receive window after
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* scaling (bytes)
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*/
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uint32_t tcpi_rehash; /* PLB or timeout triggered rehash attempts */
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uint16_t tcpi_total_rto; /* Total number of RTO timeouts, including
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* SYN/SYN-ACK and recurring timeouts.
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*/
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uint16_t tcpi_total_rto_recoveries; /* Total number of RTO
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* recoveries, including any
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* unfinished recovery.
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*/
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uint32_t tcpi_total_rto_time; /* Total time spent in RTO recoveries
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* in milliseconds, including any
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* unfinished recovery.
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*/
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};
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#include <linux/falloc.h>
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#ifndef FALLOC_FL_COLLAPSE_RANGE
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#define FALLOC_FL_COLLAPSE_RANGE 0x08
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#endif
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#include <linux/close_range.h>
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/* glibc < 2.34 and musl as of 1.2.5 need these */
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#ifndef SYS_close_range
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#define SYS_close_range 436
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#endif
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#ifndef CLOSE_RANGE_UNSHARE /* Linux kernel < 5.9 */
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#define CLOSE_RANGE_UNSHARE (1U << 1)
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#endif
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__attribute__ ((weak))
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/* cppcheck-suppress funcArgNamesDifferent */
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int close_range(unsigned int first, unsigned int last, int flags) {
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return syscall(SYS_close_range, first, last, flags);
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}
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#endif /* LINUX_DEP_H */
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