motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 23:33:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

hw/net/net_tx_pkt: Implement TCP segmentation

Browse source 
There was no proper implementation of TCP segmentation before this
change, and net_tx_pkt relied solely on IPv4 fragmentation. Not only
this is not aligned with the specification, but it also resulted in
corrupted IPv6 packets.

This is particularly problematic for the igb, a new proposed device
implementation; igb provides loopback feature for VMDq and the feature
relies on software segmentation.

Implement proper TCP segmentation in net_tx_pkt to fix such a scenario.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Akihiko Odaki 2023-02-23 19:20:09 +09:00 • committed by Jason Wang
parent ffbd2dbd8e
commit 02ef5fdc09
3 changed files with 207 additions and 75 deletions
Download patch file Download diff file Expand all files Collapse all files

27
net/eth.c
View file

@ -314,33 +314,6 @@ eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
return 0;
}
void
eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len,
void *l3hdr, size_t l3hdr_len,
size_t l3payload_len,
size_t frag_offset, bool more_frags)
{
const struct iovec l2vec = {
.iov_base = (void *) l2hdr,
.iov_len = l2hdr_len
};
if (eth_get_l3_proto(&l2vec, 1, l2hdr_len) == ETH_P_IP) {
uint16_t orig_flags;
struct ip_header *iphdr = (struct ip_header *) l3hdr;
uint16_t frag_off_units = frag_offset / IP_FRAG_UNIT_SIZE;
uint16_t new_ip_off;
assert(frag_offset % IP_FRAG_UNIT_SIZE == 0);
assert((frag_off_units & ~IP_OFFMASK) == 0);
orig_flags = be16_to_cpu(iphdr->ip_off) & ~(IP_OFFMASK|IP_MF);
new_ip_off = frag_off_units | orig_flags | (more_frags ? IP_MF : 0);
iphdr->ip_off = cpu_to_be16(new_ip_off);
iphdr->ip_len = cpu_to_be16(l3payload_len + l3hdr_len);
}
}
void
eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len)
{