hw/net/virtio-net.c: Don't assume IP length field is aligned

In virtio-net.c we assume that the IP length field in the packet is
aligned, and we copy its address into a uint16_t* in the
VirtioNetRscUnit struct which we then dereference later.  This isn't
a safe assumption; it will also result in compilation failures if we
mark the ip_header struct as QEMU_PACKED because the compiler will
not let you take the address of an unaligned struct field.

Make the ip_plen field in VirtioNetRscUnit a void*, and make all the
places where we read or write through that pointer instead use some
new accessor functions read_unit_ip_len() and write_unit_ip_len()
which account for the pointer being potentially unaligned and also do
the network-byte-order conversion we were previously using htons() to
perform.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20241114141619.806652-2-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index 060c23c04d..b9ea9e824e 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -102,7 +102,7 @@ typedef struct VirtioNetRscStat {
 /* Rsc unit general info used to checking if can coalescing */
 typedef struct VirtioNetRscUnit {
     void *ip;   /* ip header */
-    uint16_t *ip_plen;      /* data len pointer in ip header field */
+    void *ip_plen; /* pointer to unaligned uint16_t data len in ip header */
     struct tcp_header *tcp; /* tcp header */
     uint16_t tcp_hdrlen;    /* tcp header len */
     uint16_t payload;       /* pure payload without virtio/eth/ip/tcp */