getsockopt(SO_SNDBUF) and openssh/HPN
Hello, Please identify any false statements (particularly statement 7 which accuses FreeBSD 10.1 of having a bug): 1. openssh limits the size of "the outgoing buffer" to 65KB 2. (1) limits bandwidth on high BDP links. 3. FreeBSD 10.1 supplied openssh/HPN tries to fix (2) by increasing the size of "the outgoing buffer" to match the SO_SNDBUF capacity 4. openssh/HPN accomplishes (3) by periodically calling getsockopt(SO_SNDBUF) 5. In FreeBSD 10.1, getsockopt(SO_SNDBUF) does not return the value set by setsockopt(SO_SNDBUF). Instead it reports the high watermark of the outgoing buffer. 6. (3) does nothing because of (4) and (5) 7. There is a bug in FreeBSD 10.1 networking or FreeBSD 10.1 supplied openssh/HPN: 7a. FreeBSD bug: getsockopt(SO_SNDBUF) does not return value set by setsockopt(SO_SNDBUF) 7b. openssh/HPN bug: do not use getsockopt(SO_SNDBUF) to get the value set by setsockopt(SO_SNDBUF) -- use something else Original thread from August 2015: https://www.mail-archive.com/freebsd-net@freebsd.org/msg49793.html Thank you, Chris ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
BPF Berkeley Packet Filter
Hello, I have a question regarding Berkeley Packet filter, which is Can I read an incoming packet length with BPF, I am working on a project that requires to filter the receiving packets in the kernel before they get to userspace, but I need to be able to read the packet length when applying BPF because I (previously) encapsulated the packet with my own metadata before sending it to the machine with BPF so I want to read packet length to decapsulate as I know the value for the metadata at the end of the packet? Thank you in advance! ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
[Bug 205706] Watchdog timeout on em driver under heavy traffic on a bridge configuration
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205706 Mark Linimon changed: What|Removed |Added Assignee|freebsd-b...@freebsd.org|freebsd-net@FreeBSD.org Keywords||IntelNetworking -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
BPF Berkeley Packet Filter
Hello BSD folks, I am developing a networking application in C and I have a question regarding BPF (Berkeley Packet Filters), I will give you an idea of the app first, I need to send a packet from machine A to machine B (any kind of packet) so for this I wrote a packet generator application which will send a packet to machine B, but before sending the packet I need to append some metadata values at the end of the packet, already done, so in machine B I have a raw socket listener app ready to receive incoming packets from machine A, however I want to implement filtering with BPF on machine B, but as my metadata was appended at the end of the packet (have to be at the end), I need to read the packet length with(using) Berkeley Packet Filter to match a specific field to filter one of the bytes at the end of my packet (metadata appended), in other words I need to know the incoming packet length to filtered against one of the metadatas fields and be able to drop the packet before reaching user space applications(drop it in kernel space). So my question is, Can I use BPF to read the packet length to do what I want? Thank you in advance! Happy Holidays! ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
