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Re: [PATCH v4 20/28] net: Strip virtio-net header when dumping
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH v4 20/28] net: Strip virtio-net header when dumping |
Date: |
Mon, 30 Jan 2023 10:12:58 -0500 |
On Mon, Jan 30, 2023 at 10:47:07PM +0900, Akihiko Odaki wrote:
> 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 <akihiko.odaki@daynix.com>
Probably means you need to calculate checksums and split gso too right?
> ---
> 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,
> uint8_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;
> };
>
> -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 = iov_size(iov, cnt);
> + size_t size = iov_size(iov, cnt) - offset;
> struct iovec dumpiov[cnt + 1];
>
> /* Early return in case of previous error. */
> @@ -84,7 +85,7 @@ static ssize_t dump_receive_iov(DumpState *s, const struct
> iovec *iov, int cnt)
>
> dumpiov[0].iov_base = &hdr;
> dumpiov[0].iov_len = sizeof(hdr);
> - cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen);
> + cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, offset, caplen);
>
> if (writev(s->fd, dumpiov, cnt + 1) != 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 = FILTER_DUMP(nf);
> + int offset = qemu_get_using_vnet_hdr(nf->netdev) ?
> + qemu_get_vnet_hdr_len(nf->netdev) : 0;
>
> - dump_receive_iov(&nfds->ds, iov, iovcnt);
> + dump_receive_iov(&nfds->ds, iov, iovcnt, offset);
> return 0;
> }
>
> 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);
> }
>
> +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, int
> tso4, int tso6,
> nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
> }
>
> +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, int
> len)
> return !!tap_probe_vnet_hdr_len(s->fd, len);
> }
>
> +static int tap_get_vnet_hdr_len(NetClientState *nc)
> +{
> + TAPState *s = DO_UPCAST(TAPState, nc, nc);
> +
> + return s->host_vnet_hdr_len;
> +}
> +
> static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
> {
> TAPState *s = DO_UPCAST(TAPState, nc, nc);
> @@ -268,6 +275,13 @@ static void tap_set_vnet_hdr_len(NetClientState *nc, int
> len)
> s->host_vnet_hdr_len = len;
> }
>
> +static bool tap_get_using_vnet_hdr(NetClientState *nc)
> +{
> + TAPState *s = DO_UPCAST(TAPState, nc, nc);
> +
> + return s->using_vnet_hdr;
> +}
> +
> static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
> {
> TAPState *s = DO_UPCAST(TAPState, nc, nc);
> @@ -372,8 +386,10 @@ static NetClientInfo net_tap_info = {
> .has_ufo = tap_has_ufo,
> .has_vnet_hdr = tap_has_vnet_hdr,
> .has_vnet_hdr_len = tap_has_vnet_hdr_len,
> + .get_using_vnet_hdr = tap_get_using_vnet_hdr,
> .using_vnet_hdr = tap_using_vnet_hdr,
> .set_offload = tap_set_offload,
> + .get_vnet_hdr_len = tap_get_vnet_hdr_len,
> .set_vnet_hdr_len = tap_set_vnet_hdr_len,
> .set_vnet_le = tap_set_vnet_le,
> .set_vnet_be = tap_set_vnet_be,
> --
> 2.39.1
- [PATCH v4 13/28] e1000: Configure ResettableClass, (continued)
- [PATCH v4 13/28] e1000: Configure ResettableClass, Akihiko Odaki, 2023/01/30
- [PATCH v4 11/28] e1000e: Remove pending interrupt flags, Akihiko Odaki, 2023/01/30
- [PATCH v4 12/28] e1000e: Improve software reset, Akihiko Odaki, 2023/01/30
- [PATCH v4 14/28] e1000e: Configure ResettableClass, Akihiko Odaki, 2023/01/30
- [PATCH v4 15/28] e1000e: Introduce e1000_rx_desc_union, Akihiko Odaki, 2023/01/30
- [PATCH v4 16/28] e1000e: Set MII_ANER_NWAY, Akihiko Odaki, 2023/01/30
- [PATCH v4 17/28] e1000e: Remove extra pointer indirection, Akihiko Odaki, 2023/01/30
- [PATCH v4 19/28] e1000x: Alter the signature of e1000x_is_vlan_packet, Akihiko Odaki, 2023/01/30
- [PATCH v4 18/28] net: Check L4 header size, Akihiko Odaki, 2023/01/30
- [PATCH v4 20/28] net: Strip virtio-net header when dumping, Akihiko Odaki, 2023/01/30
- Re: [PATCH v4 20/28] net: Strip virtio-net header when dumping,
Michael S. Tsirkin <=
[PATCH v4 24/28] hw/net/net_tx_pkt: Implement TCP segmentation, Akihiko Odaki, 2023/01/30
[PATCH v4 23/28] e1000e: Perform software segmentation for loopback, Akihiko Odaki, 2023/01/30
[PATCH v4 21/28] hw/net/net_tx_pkt: Automatically determine if virtio-net header is used, Akihiko Odaki, 2023/01/30
[PATCH v4 26/28] e1000e: Do not assert when MSI-X is disabled later, Akihiko Odaki, 2023/01/30
[PATCH v4 22/28] hw/net/net_rx_pkt: Remove net_rx_pkt_has_virt_hdr, Akihiko Odaki, 2023/01/30
[PATCH v4 25/28] hw/net/net_tx_pkt: Check the payload length, Akihiko Odaki, 2023/01/30
[PATCH v4 27/28] MAINTAINERS: Add Akihiko Odaki as a e1000e reviewer, Akihiko Odaki, 2023/01/30