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eth: Extend vlan stripping functions 

Make VLAN stripping functions return number of bytes
copied to given Ethernet header buffer.

This information should be used to re-compose
packet IOV after VLAN stripping.

Cc: qemu-stable@nongnu.org
Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Dmitry Fleytman 2017-02-16 14:29:32 +02:00 committed by Jason Wang
parent 290e6e113b
commit 566342c312
2 changed files with 16 additions and 13 deletions
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4
include/net/eth.h
View File

@ -331,12 +331,12 @@ eth_get_pkt_tci(const void *p)
}
}
bool
size_t
eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
uint8_t *new_ehdr_buf,
uint16_t *payload_offset, uint16_t *tci);
bool
size_t
eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
uint16_t vet, uint8_t *new_ehdr_buf,
uint16_t *payload_offset, uint16_t *tci);

25
net/eth.c
View File

@ -232,7 +232,7 @@ void eth_get_protocols(const struct iovec *iov, int iovcnt,
}
}
bool
size_t
eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
uint8_t *new_ehdr_buf,
uint16_t *payload_offset, uint16_t *tci)
@ -244,7 +244,7 @@ eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
new_ehdr, sizeof(*new_ehdr));
if (copied < sizeof(*new_ehdr)) {
return false;
return 0;
}
switch (be16_to_cpu(new_ehdr->h_proto)) {
@ -254,7 +254,7 @@ eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
&vlan_hdr, sizeof(vlan_hdr));
if (copied < sizeof(vlan_hdr)) {
return false;
return 0;
}
new_ehdr->h_proto = vlan_hdr.h_proto;
@ -268,18 +268,21 @@ eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
PKT_GET_VLAN_HDR(new_ehdr), sizeof(vlan_hdr));
if (copied < sizeof(vlan_hdr)) {
return false;
return 0;
}
*payload_offset += sizeof(vlan_hdr);
return sizeof(struct eth_header) + sizeof(struct vlan_header);
} else {
return sizeof(struct eth_header);
}
return true;
default:
return false;
return 0;
}
}
bool
size_t
eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
uint16_t vet, uint8_t *new_ehdr_buf,
uint16_t *payload_offset, uint16_t *tci)
@ -291,7 +294,7 @@ eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
new_ehdr, sizeof(*new_ehdr));
if (copied < sizeof(*new_ehdr)) {
return false;
return 0;
}
if (be16_to_cpu(new_ehdr->h_proto) == vet) {
@ -299,17 +302,17 @@ eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
&vlan_hdr, sizeof(vlan_hdr));
if (copied < sizeof(vlan_hdr)) {
return false;
return 0;
}
new_ehdr->h_proto = vlan_hdr.h_proto;
*tci = be16_to_cpu(vlan_hdr.h_tci);
*payload_offset = iovoff + sizeof(*new_ehdr) + sizeof(vlan_hdr);
return true;
return sizeof(struct eth_header);
}
return false;
return 0;
}
void