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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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, eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
uint8_t *new_ehdr_buf, uint8_t *new_ehdr_buf,
uint16_t *payload_offset, uint16_t *tci); uint16_t *payload_offset, uint16_t *tci);
bool size_t
eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff, eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
uint16_t vet, uint8_t *new_ehdr_buf, uint16_t vet, uint8_t *new_ehdr_buf,
uint16_t *payload_offset, uint16_t *tci); 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, eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
uint8_t *new_ehdr_buf, uint8_t *new_ehdr_buf,
uint16_t *payload_offset, uint16_t *tci) 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)); new_ehdr, sizeof(*new_ehdr));
if (copied < sizeof(*new_ehdr)) { if (copied < sizeof(*new_ehdr)) {
return false; return 0;
} }
switch (be16_to_cpu(new_ehdr->h_proto)) { 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)); &vlan_hdr, sizeof(vlan_hdr));
if (copied < sizeof(vlan_hdr)) { if (copied < sizeof(vlan_hdr)) {
return false; return 0;
} }
new_ehdr->h_proto = vlan_hdr.h_proto; 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)); PKT_GET_VLAN_HDR(new_ehdr), sizeof(vlan_hdr));
if (copied < sizeof(vlan_hdr)) { if (copied < sizeof(vlan_hdr)) {
return false; return 0;
} }
*payload_offset += sizeof(vlan_hdr); *payload_offset += sizeof(vlan_hdr);
return sizeof(struct eth_header) + sizeof(struct vlan_header);
} else {
return sizeof(struct eth_header);
} }
return true;
default: default:
return false; return 0;
} }
} }
bool size_t
eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff, eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
uint16_t vet, uint8_t *new_ehdr_buf, uint16_t vet, uint8_t *new_ehdr_buf,
uint16_t *payload_offset, uint16_t *tci) 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)); new_ehdr, sizeof(*new_ehdr));
if (copied < sizeof(*new_ehdr)) { if (copied < sizeof(*new_ehdr)) {
return false; return 0;
} }
if (be16_to_cpu(new_ehdr->h_proto) == vet) { 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)); &vlan_hdr, sizeof(vlan_hdr));
if (copied < sizeof(vlan_hdr)) { if (copied < sizeof(vlan_hdr)) {
return false; return 0;
} }
new_ehdr->h_proto = vlan_hdr.h_proto; new_ehdr->h_proto = vlan_hdr.h_proto;
*tci = be16_to_cpu(vlan_hdr.h_tci); *tci = be16_to_cpu(vlan_hdr.h_tci);
*payload_offset = iovoff + sizeof(*new_ehdr) + sizeof(vlan_hdr); *payload_offset = iovoff + sizeof(*new_ehdr) + sizeof(vlan_hdr);
return true; return sizeof(struct eth_header);
} }
return false; return 0;
} }
void void