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Tsirkin" , Yan Vugenfirer , Yuri Benditovich , Sriram Yagnaraman , Akihiko Odaki Subject: [PATCH v2 20/26] net: Strip virtio-net header when dumping Date: Tue, 24 Jan 2023 13:31:37 +0900 Message-Id: <20230124043143.5515-21-akihiko.odaki@daynix.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230124043143.5515-1-akihiko.odaki@daynix.com> References: <20230124043143.5515-1-akihiko.odaki@daynix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2607:f8b0:4864:20::1030; envelope-from=akihiko.odaki@daynix.com; helo=mail-pj1-x1030.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @daynix-com.20210112.gappssmtp.com) X-ZM-MESSAGEID: 1674535013344100002 Content-Type: text/plain; charset="utf-8" filter-dump specifiees Ethernet as PCAP LinkType, which does not expect virtio-net header. Having virtio-net header in such PCAP file breaks PCAP unconsumable. Unfortunately currently there is no LinkType for virtio-net so for now strip virtio-net header to convert the output to Ethernet. Signed-off-by: Akihiko Odaki --- include/net/net.h | 6 ++++++ net/dump.c | 11 +++++++---- net/net.c | 18 ++++++++++++++++++ net/tap.c | 16 ++++++++++++++++ 4 files changed, 47 insertions(+), 4 deletions(-) diff --git a/include/net/net.h b/include/net/net.h index dc20b31e9f..4b2d72b3fc 100644 --- a/include/net/net.h +++ b/include/net/net.h @@ -56,8 +56,10 @@ typedef RxFilterInfo *(QueryRxFilter)(NetClientState *); typedef bool (HasUfo)(NetClientState *); typedef bool (HasVnetHdr)(NetClientState *); typedef bool (HasVnetHdrLen)(NetClientState *, int); +typedef bool (GetUsingVnetHdr)(NetClientState *); typedef void (UsingVnetHdr)(NetClientState *, bool); typedef void (SetOffload)(NetClientState *, int, int, int, int, int); +typedef int (GetVnetHdrLen)(NetClientState *); typedef void (SetVnetHdrLen)(NetClientState *, int); typedef int (SetVnetLE)(NetClientState *, bool); typedef int (SetVnetBE)(NetClientState *, bool); @@ -84,8 +86,10 @@ typedef struct NetClientInfo { HasUfo *has_ufo; HasVnetHdr *has_vnet_hdr; HasVnetHdrLen *has_vnet_hdr_len; + GetUsingVnetHdr *get_using_vnet_hdr; UsingVnetHdr *using_vnet_hdr; SetOffload *set_offload; + GetVnetHdrLen *get_vnet_hdr_len; SetVnetHdrLen *set_vnet_hdr_len; SetVnetLE *set_vnet_le; SetVnetBE *set_vnet_be; @@ -183,9 +187,11 @@ void qemu_format_nic_info_str(NetClientState *nc, uint= 8_t macaddr[6]); bool qemu_has_ufo(NetClientState *nc); bool qemu_has_vnet_hdr(NetClientState *nc); bool qemu_has_vnet_hdr_len(NetClientState *nc, int len); +bool qemu_get_using_vnet_hdr(NetClientState *nc); void qemu_using_vnet_hdr(NetClientState *nc, bool enable); void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, int ecn, int ufo); +int qemu_get_vnet_hdr_len(NetClientState *nc); void qemu_set_vnet_hdr_len(NetClientState *nc, int len); int qemu_set_vnet_le(NetClientState *nc, bool is_le); int qemu_set_vnet_be(NetClientState *nc, bool is_be); diff --git a/net/dump.c b/net/dump.c index 6a63b15359..7d05f16ca7 100644 --- a/net/dump.c +++ b/net/dump.c @@ -61,12 +61,13 @@ struct pcap_sf_pkthdr { uint32_t len; }; =20 -static ssize_t dump_receive_iov(DumpState *s, const struct iovec *iov, int= cnt) +static ssize_t dump_receive_iov(DumpState *s, const struct iovec *iov, int= cnt, + int offset) { struct pcap_sf_pkthdr hdr; int64_t ts; int caplen; - size_t size =3D iov_size(iov, cnt); + size_t size =3D iov_size(iov, cnt) - offset; struct iovec dumpiov[cnt + 1]; =20 /* Early return in case of previous error. */ @@ -84,7 +85,7 @@ static ssize_t dump_receive_iov(DumpState *s, const struc= t iovec *iov, int cnt) =20 dumpiov[0].iov_base =3D &hdr; dumpiov[0].iov_len =3D sizeof(hdr); - cnt =3D iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen); + cnt =3D iov_copy(&dumpiov[1], cnt, iov, cnt, offset, caplen); =20 if (writev(s->fd, dumpiov, cnt + 1) !=3D sizeof(hdr) + caplen) { error_report("network dump write error - stopping dump"); @@ -153,8 +154,10 @@ static ssize_t filter_dump_receive_iov(NetFilterState = *nf, NetClientState *sndr, int iovcnt, NetPacketSent *sent_cb) { NetFilterDumpState *nfds =3D FILTER_DUMP(nf); + int offset =3D qemu_get_using_vnet_hdr(nf->netdev) ? + qemu_get_vnet_hdr_len(nf->netdev) : 0; =20 - dump_receive_iov(&nfds->ds, iov, iovcnt); + dump_receive_iov(&nfds->ds, iov, iovcnt, offset); return 0; } =20 diff --git a/net/net.c b/net/net.c index 2d01472998..03f17de5fc 100644 --- a/net/net.c +++ b/net/net.c @@ -513,6 +513,15 @@ bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) return nc->info->has_vnet_hdr_len(nc, len); } =20 +bool qemu_get_using_vnet_hdr(NetClientState *nc) +{ + if (!nc || !nc->info->get_using_vnet_hdr) { + return false; + } + + return nc->info->get_using_vnet_hdr(nc); +} + void qemu_using_vnet_hdr(NetClientState *nc, bool enable) { if (!nc || !nc->info->using_vnet_hdr) { @@ -532,6 +541,15 @@ void qemu_set_offload(NetClientState *nc, int csum, in= t tso4, int tso6, nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); } =20 +int qemu_get_vnet_hdr_len(NetClientState *nc) +{ + if (!nc || !nc->info->get_vnet_hdr_len) { + return 0; + } + + return nc->info->get_vnet_hdr_len(nc); +} + void qemu_set_vnet_hdr_len(NetClientState *nc, int len) { if (!nc || !nc->info->set_vnet_hdr_len) { diff --git a/net/tap.c b/net/tap.c index 7d7bc1dc5f..1bf085d422 100644 --- a/net/tap.c +++ b/net/tap.c @@ -255,6 +255,13 @@ static bool tap_has_vnet_hdr_len(NetClientState *nc, i= nt len) return !!tap_probe_vnet_hdr_len(s->fd, len); } =20 +static int tap_get_vnet_hdr_len(NetClientState *nc) +{ + TAPState *s =3D DO_UPCAST(TAPState, nc, nc); + + return s->host_vnet_hdr_len; +} + static void tap_set_vnet_hdr_len(NetClientState *nc, int len) { TAPState *s =3D DO_UPCAST(TAPState, nc, nc); @@ -268,6 +275,13 @@ static void tap_set_vnet_hdr_len(NetClientState *nc, i= nt len) s->host_vnet_hdr_len =3D len; } =20 +static bool tap_get_using_vnet_hdr(NetClientState *nc) +{ + TAPState *s =3D DO_UPCAST(TAPState, nc, nc); + + return s->using_vnet_hdr; +} + static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr) { TAPState *s =3D DO_UPCAST(TAPState, nc, nc); @@ -372,8 +386,10 @@ static NetClientInfo net_tap_info =3D { .has_ufo =3D tap_has_ufo, .has_vnet_hdr =3D tap_has_vnet_hdr, .has_vnet_hdr_len =3D tap_has_vnet_hdr_len, + .get_using_vnet_hdr =3D tap_get_using_vnet_hdr, .using_vnet_hdr =3D tap_using_vnet_hdr, .set_offload =3D tap_set_offload, + .get_vnet_hdr_len =3D tap_get_vnet_hdr_len, .set_vnet_hdr_len =3D tap_set_vnet_hdr_len, .set_vnet_le =3D tap_set_vnet_le, .set_vnet_be =3D tap_set_vnet_be, --=20 2.39.0