From owner-freebsd-net@freebsd.org Sat Apr 16 05:39:03 2016 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id A9FF7B1062F for ; Sat, 16 Apr 2016 05:39:03 +0000 (UTC) (envelope-from bazzoola@gmail.com) Received: from mail-wm0-x233.google.com (mail-wm0-x233.google.com [IPv6:2a00:1450:400c:c09::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 523A91347 for ; Sat, 16 Apr 2016 05:39:03 +0000 (UTC) (envelope-from bazzoola@gmail.com) Received: by mail-wm0-x233.google.com with SMTP id v188so54974747wme.1 for ; Fri, 15 Apr 2016 22:39:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=to:from:subject:message-id:date:user-agent:mime-version :content-transfer-encoding; bh=acO3LcVxEyJjqb/IqSiq2mHF8/k5i9WAxQRAEFwgH1k=; b=ASDN4fOx6CgeVrwAeLZbX96atIbtLBptKgqfMw6lb2nMrmPOGbXI1rQV2AXc1p1KNC cKHPr3O5qKd5EBxqVdUrYk2iY58mdas2ImOn0Ranh98eRW/N0cVf5xe5acAJ+QnyTTvM fA9tsbjAElJvGVpq48t8Rfz8yXgXsHydvPYGz7eao5eWbAuvrN4mSjv9elumpPvRQ+Jg pm5aKxSC1Dva2Sy4P2smVxfSUt3yyWEoFxzSau5O8QOCbSkjA23a7E16xyuU976sK6kp P5szHkHo3AtPdaapR0zqJxzXrxAke1zTUHv8ARigj9wTc6+1YGQhlBjpMFPF7fMJLDJp HUnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:from:subject:message-id:date:user-agent :mime-version:content-transfer-encoding; bh=acO3LcVxEyJjqb/IqSiq2mHF8/k5i9WAxQRAEFwgH1k=; b=nKaUNJfSWpyznqDuY8x1oWWi5guAnK2RXN1ysSBfSxf7m+fiIyPvmr4i/KmaFBGgZS MtxIqTsnJSS9csaHEWTHDYP8yaNe8MOaNOjZXJjvVd8pH1m4yVvlNJab8CmRWxWfxpxI GJredK2UHaBYUzz9f3ypArf4xdIuqPSzR+IEXfFZ9bqnZGhm8lpn8D2lc1zznnJtvzJY gTxC9LT9xzXHbV+LHbwfvj8feD3+XLfLfRIIRqPKMYoqadIqEqRbQxy0BI8lYB2+ouwq /0PUvavNr8Fn+HKoFD/GN9fw27MF2iRqT211V/QwNoSx8E5AwuXG/nG+C5QbNeXbAT3C AUpg== X-Gm-Message-State: AOPr4FUSrpdQ9La0ScbNVRmJEHWsbiT9R4cz6BPw7SXSMFgc0s79jj8+le+a2KMs6l4zgw== X-Received: by 10.28.153.65 with SMTP id b62mr8286484wme.36.1460785141070; Fri, 15 Apr 2016 22:39:01 -0700 (PDT) Received: from ?IPv6:2601:644:8280:59de:6a17:29ff:fe85:4927? ([2601:644:8280:59de:6a17:29ff:fe85:4927]) by smtp.googlemail.com with ESMTPSA id h124sm1602732wmf.7.2016.04.15.22.38.59 for (version=TLSv1/SSLv3 cipher=OTHER); Fri, 15 Apr 2016 22:39:00 -0700 (PDT) To: freebsd-net@freebsd.org From: bazzoola Subject: Tracing dropped UDP packets Message-ID: <5711CFF1.60708@gmail.com> Date: Fri, 15 Apr 2016 22:38:57 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 Apr 2016 05:39:03 -0000 Greetings, I would like to know where (in the kernel) UDP packets are dropped. I looked at udp_usrreq.c but is overwhelming for the 1st time. Is it possible to use DTrace to locate where the packets are being dropped? or is there a tool similar to 'dropwatch' which can tell me where in the kernel my packets are getting dropped? On Linux, I used dropwatch and they were dropped packets were at udp_queue_rcv_skb(). Thanks!