Date: Fri, 12 Feb 2016 18:02:47 +0000 (UTC) From: Pallav Bose <pallav_bose@yahoo.com> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Cc: "rpokala@mac.com" <rpokala@mac.com> Subject: Re: C program API to determine negotiated link speed of a network interface? Message-ID: <604939402.3154674.1455300167449.JavaMail.yahoo@mail.yahoo.com> In-Reply-To: <249322925.1631277.1455058288002.JavaMail.yahoo@mail.yahoo.com> References: <249322925.1631277.1455058288002.JavaMail.yahoo.ref@mail.yahoo.com> <249322925.1631277.1455058288002.JavaMail.yahoo@mail.yahoo.com>
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Hi Ravi,
That information you provided was very useful, thanks!=20
=C2=A0Regards,
Pallav=20
On Tuesday, February 9, 2016 2:51 PM, Pallav Bose <pallav_bose@yahoo.co=
m> wrote:
=20
Hi,
I'm writing a C program to list all available interfaces and their link spe=
ed. I can use getifaddrs(3) to obtain a list of network interfaces in a str=
uct ifaddrs, but none of the fields in this struct gives me information abo=
ut the negotiated link speed. From the man page of getifaddrs(3):
The ifaddrs structure contains at least the following entries:
=C2=A0=C2=A0=C2=A0 =C2=A0struct=C2=A0=C2=A0=C2=A0 ifaddrs=C2=A0=C2=A0=C2=A0=
*ifa_next;=C2=A0=C2=A0=C2=A0 =C2=A0 /* Pointer to next struct */
=C2=A0=C2=A0=C2=A0 =C2=A0char=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *ifa_name;=C2=A0=C2=A0=C2=A0 =
=C2=A0 /* Interface name */
=C2=A0=C2=A0=C2=A0 =C2=A0u_int=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ifa_flags;=C2=A0=C2=A0=C2=A0 =
=C2=A0 /* Interface flags=C2=A0=C2=A0=C2=A0 */
=C2=A0=C2=A0=C2=A0 =C2=A0struct=C2=A0=C2=A0=C2=A0 sockaddr=C2=A0 *ifa_addr;=
=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0 /* Interface address */
=C2=A0=C2=A0=C2=A0 =C2=A0struct=C2=A0=C2=A0=C2=A0 sockaddr=C2=A0 *ifa_netma=
sk;=C2=A0=C2=A0=C2=A0 /* Interface netmask */
=C2=A0=C2=A0=C2=A0 =C2=A0struct=C2=A0=C2=A0=C2=A0 sockaddr=C2=A0 *ifa_broad=
addr;=C2=A0 /* Interface broadcast address */
=C2=A0=C2=A0=C2=A0 =C2=A0struct=C2=A0=C2=A0=C2=A0 sockaddr=C2=A0 *ifa_dstad=
dr;=C2=A0=C2=A0=C2=A0 /* P2P interface destination */
=C2=A0=C2=A0=C2=A0 =C2=A0void=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *ifa_data;=C2=A0=C2=A0=C2=A0 =C2=A0=C2=
=A0 /* Address specific data */
Running truss on ifconfig(8) tells me that the ioctl SIOCGIFMEDIA can be us=
ed, but it is not clear to me how. Is there an API in C which does this alr=
eady?
# truss ifconfig em0....<snipped>....
ioctl(3,SIOCGIFMAC,0xffffe210)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ERR#22 'Inv=
alid argument'
ioctl(3,SIOCGIFMEDIA,0xffffe1f0)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0 (0x0)
ioctl(3,SIOCGIFMEDIA,0xffffe1f0)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0 (0x0)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 media: Ethernet autoselect (1000=
baseT <full-duplex>)
write(1,"\tmedia: Ethernet autoselect (10"...,54) =3D 54 (0x36)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 status: active
write(1,"\tstatus: active\n",16)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 16 (0x10)
Thanks,Pallav
From owner-freebsd-net@freebsd.org Fri Feb 12 21:02:10 2016
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Subject: [Bug 207087] kernel: r295285 in 10.2-STABLE breaks OpenVPN
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Date: Fri, 12 Feb 2016 21:02:09 +0000
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--- Comment #19 from g_amanakis@yahoo.com ---
Created attachment 166908
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