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net: move gso declarations and functions to their own files 

Move declarations into include/net/gso.h and code into net/core/gso.c

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Stanislav Fomichev <sdf@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20230608191738.3947077-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2023-06-08 19:17:37 +00:00 committed by Jakub Kicinski
parent cabb8b48e5
commit d457a0e329
46 changed files with 425 additions and 365 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/broadcom/tg3.c
View File

@ -57,6 +57,7 @@
#include <linux/crc32poly.h>
#include <net/checksum.h>
#include <net/gso.h>
#include <net/ip.h>
#include <linux/io.h>

1
drivers/net/ethernet/myricom/myri10ge/myri10ge.c
View File

@ -66,6 +66,7 @@
#include <linux/slab.h>
#include <linux/prefetch.h>
#include <net/checksum.h>
#include <net/gso.h>
#include <net/ip.h>
#include <net/tcp.h>
#include <asm/byteorder.h>

1
drivers/net/ethernet/sfc/siena/tx_common.c
View File

@ -12,6 +12,7 @@
#include "efx.h"
#include "nic_common.h"
#include "tx_common.h"
#include <net/gso.h>
static unsigned int efx_tx_cb_page_count(struct efx_tx_queue *tx_queue)
{

1
drivers/net/ethernet/sfc/tx_common.c
View File

@ -12,6 +12,7 @@
#include "efx.h"
#include "nic_common.h"
#include "tx_common.h"
#include <net/gso.h>
static unsigned int efx_tx_cb_page_count(struct efx_tx_queue *tx_queue)
{

1
drivers/net/tap.c
View File

@ -18,6 +18,7 @@
#include <linux/fs.h>
#include <linux/uio.h>
#include <net/gso.h>
#include <net/net_namespace.h>
#include <net/rtnetlink.h>
#include <net/sock.h>

1
drivers/net/usb/r8152.c
View File

@ -27,6 +27,7 @@
#include <linux/firmware.h>
#include <crypto/hash.h>
#include <linux/usb/r8152.h>
#include <net/gso.h>
/* Information for net-next */
#define NETNEXT_VERSION "12"

1
drivers/net/wireguard/device.c
View File

@ -20,6 +20,7 @@
#include <linux/icmp.h>
#include <linux/suspend.h>
#include <net/dst_metadata.h>
#include <net/gso.h>
#include <net/icmp.h>
#include <net/rtnetlink.h>
#include <net/ip_tunnels.h>

1
drivers/net/wireless/intel/iwlwifi/mvm/tx.c
View File

@ -7,6 +7,7 @@
#include <linux/ieee80211.h>
#include <linux/etherdevice.h>
#include <linux/tcp.h>
#include <net/gso.h>
#include <net/ip.h>
#include <net/ipv6.h>

26
include/linux/netdevice.h
View File

@ -4827,13 +4827,6 @@ int skb_crc32c_csum_help(struct sk_buff *skb);
int skb_csum_hwoffload_help(struct sk_buff *skb,
const netdev_features_t features);
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path);
struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb,
netdev_features_t features, __be16 type);
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
netdev_features_t features);
struct netdev_bonding_info {
ifslave slave;
ifbond master;
@ -4856,11 +4849,6 @@ static inline void ethtool_notify(struct net_device *dev, unsigned int cmd,
}
#endif
static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
return __skb_gso_segment(skb, features, true);
}
__be16 skb_network_protocol(struct sk_buff *skb, int *depth);
static inline bool can_checksum_protocol(netdev_features_t features,
@ -4987,6 +4975,7 @@ netdev_features_t passthru_features_check(struct sk_buff *skb,
struct net_device *dev,
netdev_features_t features);
netdev_features_t netif_skb_features(struct sk_buff *skb);
void skb_warn_bad_offload(const struct sk_buff *skb);
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
{
@ -5035,19 +5024,6 @@ void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs);
void netif_inherit_tso_max(struct net_device *to,
const struct net_device *from);
static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
int pulled_hlen, u16 mac_offset,
int mac_len)
{
skb->protocol = protocol;
skb->encapsulation = 1;
skb_push(skb, pulled_hlen);
skb_reset_transport_header(skb);
skb->mac_header = mac_offset;
skb->network_header = skb->mac_header + mac_len;
skb->mac_len = mac_len;
}
static inline bool netif_is_macsec(const struct net_device *dev)
{
return dev->priv_flags & IFF_MACSEC;

71
include/linux/skbuff.h
View File

@ -3974,8 +3974,6 @@ int skb_zerocopy(struct sk_buff *to, struct sk_buff *from,
void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len);
int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen);
void skb_scrub_packet(struct sk_buff *skb, bool xnet);
bool skb_gso_validate_network_len(const struct sk_buff *skb, unsigned int mtu);
bool skb_gso_validate_mac_len(const struct sk_buff *skb, unsigned int len);
struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features);
struct sk_buff *skb_segment_list(struct sk_buff *skb, netdev_features_t features,
unsigned int offset);
@ -4841,75 +4839,6 @@ static inline struct sec_path *skb_sec_path(const struct sk_buff *skb)
#endif
}
/* Keeps track of mac header offset relative to skb->head.
* It is useful for TSO of Tunneling protocol. e.g. GRE.
* For non-tunnel skb it points to skb_mac_header() and for
* tunnel skb it points to outer mac header.
* Keeps track of level of encapsulation of network headers.
*/
struct skb_gso_cb {
union {
int mac_offset;
int data_offset;
};
int encap_level;
__wsum csum;
__u16 csum_start;
};
#define SKB_GSO_CB_OFFSET 32
#define SKB_GSO_CB(skb) ((struct skb_gso_cb *)((skb)->cb + SKB_GSO_CB_OFFSET))
static inline int skb_tnl_header_len(const struct sk_buff *inner_skb)
{
return (skb_mac_header(inner_skb) - inner_skb->head) -
SKB_GSO_CB(inner_skb)->mac_offset;
}
static inline int gso_pskb_expand_head(struct sk_buff *skb, int extra)
{
int new_headroom, headroom;
int ret;
headroom = skb_headroom(skb);
ret = pskb_expand_head(skb, extra, 0, GFP_ATOMIC);
if (ret)
return ret;
new_headroom = skb_headroom(skb);
SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom);
return 0;
}
static inline void gso_reset_checksum(struct sk_buff *skb, __wsum res)
{
/* Do not update partial checksums if remote checksum is enabled. */
if (skb->remcsum_offload)
return;
SKB_GSO_CB(skb)->csum = res;
SKB_GSO_CB(skb)->csum_start = skb_checksum_start(skb) - skb->head;
}
/* Compute the checksum for a gso segment. First compute the checksum value
* from the start of transport header to SKB_GSO_CB(skb)->csum_start, and
* then add in skb->csum (checksum from csum_start to end of packet).
* skb->csum and csum_start are then updated to reflect the checksum of the
* resultant packet starting from the transport header-- the resultant checksum
* is in the res argument (i.e. normally zero or ~ of checksum of a pseudo
* header.
*/
static inline __sum16 gso_make_checksum(struct sk_buff *skb, __wsum res)
{
unsigned char *csum_start = skb_transport_header(skb);
int plen = (skb->head + SKB_GSO_CB(skb)->csum_start) - csum_start;
__wsum partial = SKB_GSO_CB(skb)->csum;
SKB_GSO_CB(skb)->csum = res;
SKB_GSO_CB(skb)->csum_start = csum_start - skb->head;
return csum_fold(csum_partial(csum_start, plen, partial));
}
static inline bool skb_is_gso(const struct sk_buff *skb)
{
return skb_shinfo(skb)->gso_size;

1
include/net/gro.h
View File

@ -452,5 +452,6 @@ static inline void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb,
gro_normal_list(napi);
}
extern struct list_head offload_base;
#endif /* _NET_IPV6_GRO_H */

109
include/net/gso.h Normal file
View File

@ -0,0 +1,109 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _NET_GSO_H
#define _NET_GSO_H
#include <linux/skbuff.h>
/* Keeps track of mac header offset relative to skb->head.
* It is useful for TSO of Tunneling protocol. e.g. GRE.
* For non-tunnel skb it points to skb_mac_header() and for
* tunnel skb it points to outer mac header.
* Keeps track of level of encapsulation of network headers.
*/
struct skb_gso_cb {
union {
int mac_offset;
int data_offset;
};
int encap_level;
__wsum csum;
__u16 csum_start;
};
#define SKB_GSO_CB_OFFSET 32
#define SKB_GSO_CB(skb) ((struct skb_gso_cb *)((skb)->cb + SKB_GSO_CB_OFFSET))
static inline int skb_tnl_header_len(const struct sk_buff *inner_skb)
{
return (skb_mac_header(inner_skb) - inner_skb->head) -
SKB_GSO_CB(inner_skb)->mac_offset;
}
static inline int gso_pskb_expand_head(struct sk_buff *skb, int extra)
{
int new_headroom, headroom;
int ret;
headroom = skb_headroom(skb);
ret = pskb_expand_head(skb, extra, 0, GFP_ATOMIC);
if (ret)
return ret;
new_headroom = skb_headroom(skb);
SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom);
return 0;
}
static inline void gso_reset_checksum(struct sk_buff *skb, __wsum res)
{
/* Do not update partial checksums if remote checksum is enabled. */
if (skb->remcsum_offload)
return;
SKB_GSO_CB(skb)->csum = res;
SKB_GSO_CB(skb)->csum_start = skb_checksum_start(skb) - skb->head;
}
/* Compute the checksum for a gso segment. First compute the checksum value
* from the start of transport header to SKB_GSO_CB(skb)->csum_start, and
* then add in skb->csum (checksum from csum_start to end of packet).
* skb->csum and csum_start are then updated to reflect the checksum of the
* resultant packet starting from the transport header-- the resultant checksum
* is in the res argument (i.e. normally zero or ~ of checksum of a pseudo
* header.
*/
static inline __sum16 gso_make_checksum(struct sk_buff *skb, __wsum res)
{
unsigned char *csum_start = skb_transport_header(skb);
int plen = (skb->head + SKB_GSO_CB(skb)->csum_start) - csum_start;
__wsum partial = SKB_GSO_CB(skb)->csum;
SKB_GSO_CB(skb)->csum = res;
SKB_GSO_CB(skb)->csum_start = csum_start - skb->head;
return csum_fold(csum_partial(csum_start, plen, partial));
}
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path);
static inline struct sk_buff *skb_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
return __skb_gso_segment(skb, features, true);
}
struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb,
netdev_features_t features, __be16 type);
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
netdev_features_t features);
bool skb_gso_validate_network_len(const struct sk_buff *skb, unsigned int mtu);
bool skb_gso_validate_mac_len(const struct sk_buff *skb, unsigned int len);
static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
int pulled_hlen, u16 mac_offset,
int mac_len)
{
skb->protocol = protocol;
skb->encapsulation = 1;
skb_push(skb, pulled_hlen);
skb_reset_transport_header(skb);
skb->mac_header = mac_offset;
skb->network_header = skb->mac_header + mac_len;
skb->mac_len = mac_len;
}
#endif /* _NET_GSO_H */

1
include/net/udp.h
View File

@ -21,6 +21,7 @@
#include <linux/list.h>
#include <linux/bug.h>
#include <net/inet_sock.h>
#include <net/gso.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/ip.h>

2
net/core/Makefile
View File

@ -13,7 +13,7 @@ obj-y += dev.o dev_addr_lists.o dst.o netevent.o \
neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
sock_diag.o dev_ioctl.o tso.o sock_reuseport.o \
fib_notifier.o xdp.o flow_offload.o gro.o \
netdev-genl.o netdev-genl-gen.o
netdev-genl.o netdev-genl-gen.o gso.o
obj-$(CONFIG_NETDEV_ADDR_LIST_TEST) += dev_addr_lists_test.o

70
net/core/dev.c
View File

@ -3209,7 +3209,7 @@ static u16 skb_tx_hash(const struct net_device *dev,
return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
}
static void skb_warn_bad_offload(const struct sk_buff *skb)
void skb_warn_bad_offload(const struct sk_buff *skb)
{
static const netdev_features_t null_features;
struct net_device *dev = skb->dev;
@ -3338,74 +3338,6 @@ __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
return vlan_get_protocol_and_depth(skb, type, depth);
}
/* openvswitch calls this on rx path, so we need a different check.
*/
static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
{
if (tx_path)
return skb->ip_summed != CHECKSUM_PARTIAL &&
skb->ip_summed != CHECKSUM_UNNECESSARY;
return skb->ip_summed == CHECKSUM_NONE;
}
/**
* __skb_gso_segment - Perform segmentation on skb.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
* @tx_path: whether it is called in TX path
*
* This function segments the given skb and returns a list of segments.
*
* It may return NULL if the skb requires no segmentation. This is
* only possible when GSO is used for verifying header integrity.
*
* Segmentation preserves SKB_GSO_CB_OFFSET bytes of previous skb cb.
*/
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path)
{
struct sk_buff *segs;
if (unlikely(skb_needs_check(skb, tx_path))) {
int err;
/* We're going to init ->check field in TCP or UDP header */
err = skb_cow_head(skb, 0);
if (err < 0)
return ERR_PTR(err);
}
/* Only report GSO partial support if it will enable us to
* support segmentation on this frame without needing additional
* work.
*/
if (features & NETIF_F_GSO_PARTIAL) {
netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
struct net_device *dev = skb->dev;
partial_features |= dev->features & dev->gso_partial_features;
if (!skb_gso_ok(skb, features | partial_features))
features &= ~NETIF_F_GSO_PARTIAL;
}
BUILD_BUG_ON(SKB_GSO_CB_OFFSET +
sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
SKB_GSO_CB(skb)->encap_level = 0;
skb_reset_mac_header(skb);
skb_reset_mac_len(skb);
segs = skb_mac_gso_segment(skb, features);
if (segs != skb && unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs)))
skb_warn_bad_offload(skb);
return segs;
}
EXPORT_SYMBOL(__skb_gso_segment);
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG

59
net/core/gro.c
View File

@ -10,7 +10,7 @@
#define GRO_MAX_HEAD (MAX_HEADER + 128)
static DEFINE_SPINLOCK(offload_lock);
static struct list_head offload_base __read_mostly = LIST_HEAD_INIT(offload_base);
struct list_head offload_base __read_mostly = LIST_HEAD_INIT(offload_base);
/* Maximum number of GRO_NORMAL skbs to batch up for list-RX */
int gro_normal_batch __read_mostly = 8;
@ -92,63 +92,6 @@ void dev_remove_offload(struct packet_offload *po)
}
EXPORT_SYMBOL(dev_remove_offload);
/**
* skb_eth_gso_segment - segmentation handler for ethernet protocols.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
* @type: Ethernet Protocol ID
*/
struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb,
netdev_features_t features, __be16 type)
{
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_offload *ptype;
rcu_read_lock();
list_for_each_entry_rcu(ptype, &offload_base, list) {
if (ptype->type == type && ptype->callbacks.gso_segment) {
segs = ptype->callbacks.gso_segment(skb, features);
break;
}
}
rcu_read_unlock();
return segs;
}
EXPORT_SYMBOL(skb_eth_gso_segment);
/**
* skb_mac_gso_segment - mac layer segmentation handler.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
*/
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_offload *ptype;
int vlan_depth = skb->mac_len;
__be16 type = skb_network_protocol(skb, &vlan_depth);
if (unlikely(!type))
return ERR_PTR(-EINVAL);
__skb_pull(skb, vlan_depth);
rcu_read_lock();
list_for_each_entry_rcu(ptype, &offload_base, list) {
if (ptype->type == type && ptype->callbacks.gso_segment) {
segs = ptype->callbacks.gso_segment(skb, features);
break;
}
}
rcu_read_unlock();
__skb_push(skb, skb->data - skb_mac_header(skb));
return segs;
}
EXPORT_SYMBOL(skb_mac_gso_segment);
int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb)
{

273
net/core/gso.c Normal file
View File

@ -0,0 +1,273 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/skbuff.h>
#include <linux/sctp.h>
#include <net/gso.h>
#include <net/gro.h>
/**
* skb_eth_gso_segment - segmentation handler for ethernet protocols.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
* @type: Ethernet Protocol ID
*/
struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb,
netdev_features_t features, __be16 type)
{
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_offload *ptype;
rcu_read_lock();
list_for_each_entry_rcu(ptype, &offload_base, list) {
if (ptype->type == type && ptype->callbacks.gso_segment) {
segs = ptype->callbacks.gso_segment(skb, features);
break;
}
}
rcu_read_unlock();
return segs;
}
EXPORT_SYMBOL(skb_eth_gso_segment);
/**
* skb_mac_gso_segment - mac layer segmentation handler.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
*/
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_offload *ptype;
int vlan_depth = skb->mac_len;
__be16 type = skb_network_protocol(skb, &vlan_depth);
if (unlikely(!type))
return ERR_PTR(-EINVAL);
__skb_pull(skb, vlan_depth);
rcu_read_lock();
list_for_each_entry_rcu(ptype, &offload_base, list) {
if (ptype->type == type && ptype->callbacks.gso_segment) {
segs = ptype->callbacks.gso_segment(skb, features);
break;
}
}
rcu_read_unlock();
__skb_push(skb, skb->data - skb_mac_header(skb));
return segs;
}
EXPORT_SYMBOL(skb_mac_gso_segment);
/* openvswitch calls this on rx path, so we need a different check.
*/
static bool skb_needs_check(const struct sk_buff *skb, bool tx_path)
{
if (tx_path)
return skb->ip_summed != CHECKSUM_PARTIAL &&
skb->ip_summed != CHECKSUM_UNNECESSARY;
return skb->ip_summed == CHECKSUM_NONE;
}
/**
* __skb_gso_segment - Perform segmentation on skb.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
* @tx_path: whether it is called in TX path
*
* This function segments the given skb and returns a list of segments.
*
* It may return NULL if the skb requires no segmentation. This is
* only possible when GSO is used for verifying header integrity.
*
* Segmentation preserves SKB_GSO_CB_OFFSET bytes of previous skb cb.
*/
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path)
{
struct sk_buff *segs;
if (unlikely(skb_needs_check(skb, tx_path))) {
int err;
/* We're going to init ->check field in TCP or UDP header */
err = skb_cow_head(skb, 0);
if (err < 0)
return ERR_PTR(err);
}
/* Only report GSO partial support if it will enable us to
* support segmentation on this frame without needing additional
* work.
*/
if (features & NETIF_F_GSO_PARTIAL) {
netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
struct net_device *dev = skb->dev;
partial_features |= dev->features & dev->gso_partial_features;
if (!skb_gso_ok(skb, features | partial_features))
features &= ~NETIF_F_GSO_PARTIAL;
}
BUILD_BUG_ON(SKB_GSO_CB_OFFSET +
sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
SKB_GSO_CB(skb)->encap_level = 0;
skb_reset_mac_header(skb);
skb_reset_mac_len(skb);
segs = skb_mac_gso_segment(skb, features);
if (segs != skb && unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs)))
skb_warn_bad_offload(skb);
return segs;
}
EXPORT_SYMBOL(__skb_gso_segment);
/**
* skb_gso_transport_seglen - Return length of individual segments of a gso packet
*
* @skb: GSO skb
*
* skb_gso_transport_seglen is used to determine the real size of the
* individual segments, including Layer4 headers (TCP/UDP).
*
* The MAC/L2 or network (IP, IPv6) headers are not accounted for.
*/
static unsigned int skb_gso_transport_seglen(const struct sk_buff *skb)
{
const struct skb_shared_info *shinfo = skb_shinfo(skb);
unsigned int thlen = 0;
if (skb->encapsulation) {
thlen = skb_inner_transport_header(skb) -
skb_transport_header(skb);
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
thlen += inner_tcp_hdrlen(skb);
} else if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) {
thlen = tcp_hdrlen(skb);
} else if (unlikely(skb_is_gso_sctp(skb))) {
thlen = sizeof(struct sctphdr);
} else if (shinfo->gso_type & SKB_GSO_UDP_L4) {
thlen = sizeof(struct udphdr);
}
/* UFO sets gso_size to the size of the fragmentation
* payload, i.e. the size of the L4 (UDP) header is already
* accounted for.
*/
return thlen + shinfo->gso_size;
}
/**
* skb_gso_network_seglen - Return length of individual segments of a gso packet
*
* @skb: GSO skb
*
* skb_gso_network_seglen is used to determine the real size of the
* individual segments, including Layer3 (IP, IPv6) and L4 headers (TCP/UDP).
*
* The MAC/L2 header is not accounted for.
*/
static unsigned int skb_gso_network_seglen(const struct sk_buff *skb)
{
unsigned int hdr_len = skb_transport_header(skb) -
skb_network_header(skb);
return hdr_len + skb_gso_transport_seglen(skb);
}
/**
* skb_gso_mac_seglen - Return length of individual segments of a gso packet
*
* @skb: GSO skb
*
* skb_gso_mac_seglen is used to determine the real size of the
* individual segments, including MAC/L2, Layer3 (IP, IPv6) and L4
* headers (TCP/UDP).
*/
static unsigned int skb_gso_mac_seglen(const struct sk_buff *skb)
{
unsigned int hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
return hdr_len + skb_gso_transport_seglen(skb);
}
/**
* skb_gso_size_check - check the skb size, considering GSO_BY_FRAGS
*
* There are a couple of instances where we have a GSO skb, and we
* want to determine what size it would be after it is segmented.
*
* We might want to check:
* - L3+L4+payload size (e.g. IP forwarding)
* - L2+L3+L4+payload size (e.g. sanity check before passing to driver)
*
* This is a helper to do that correctly considering GSO_BY_FRAGS.
*
* @skb: GSO skb
*
* @seg_len: The segmented length (from skb_gso_*_seglen). In the
* GSO_BY_FRAGS case this will be [header sizes + GSO_BY_FRAGS].
*
* @max_len: The maximum permissible length.
*
* Returns true if the segmented length <= max length.
*/
static inline bool skb_gso_size_check(const struct sk_buff *skb,
unsigned int seg_len,
unsigned int max_len) {
const struct skb_shared_info *shinfo = skb_shinfo(skb);
const struct sk_buff *iter;
if (shinfo->gso_size != GSO_BY_FRAGS)
return seg_len <= max_len;
/* Undo this so we can re-use header sizes */
seg_len -= GSO_BY_FRAGS;
skb_walk_frags(skb, iter) {
if (seg_len + skb_headlen(iter) > max_len)
return false;
}
return true;
}
/**
* skb_gso_validate_network_len - Will a split GSO skb fit into a given MTU?
*
* @skb: GSO skb
* @mtu: MTU to validate against
*
* skb_gso_validate_network_len validates if a given skb will fit a
* wanted MTU once split. It considers L3 headers, L4 headers, and the
* payload.
*/
bool skb_gso_validate_network_len(const struct sk_buff *skb, unsigned int mtu)
{
return skb_gso_size_check(skb, skb_gso_network_seglen(skb), mtu);
}
EXPORT_SYMBOL_GPL(skb_gso_validate_network_len);
/**
* skb_gso_validate_mac_len - Will a split GSO skb fit in a given length?
*
* @skb: GSO skb
* @len: length to validate against
*
* skb_gso_validate_mac_len validates if a given skb will fit a wanted
* length once split, including L2, L3 and L4 headers and the payload.
*/
bool skb_gso_validate_mac_len(const struct sk_buff *skb, unsigned int len)
{
return skb_gso_size_check(skb, skb_gso_mac_seglen(skb), len);
}
EXPORT_SYMBOL_GPL(skb_gso_validate_mac_len);

142
net/core/skbuff.c
View File

@ -67,6 +67,7 @@
#include <net/dst.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <net/gso.h>
#include <net/ip6_checksum.h>
#include <net/xfrm.h>
#include <net/mpls.h>
@ -5766,147 +5767,6 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
}
EXPORT_SYMBOL_GPL(skb_scrub_packet);
/**
* skb_gso_transport_seglen - Return length of individual segments of a gso packet
*
* @skb: GSO skb
*
* skb_gso_transport_seglen is used to determine the real size of the
* individual segments, including Layer4 headers (TCP/UDP).
*
* The MAC/L2 or network (IP, IPv6) headers are not accounted for.
*/
static unsigned int skb_gso_transport_seglen(const struct sk_buff *skb)
{
const struct skb_shared_info *shinfo = skb_shinfo(skb);
unsigned int thlen = 0;
if (skb->encapsulation) {
thlen = skb_inner_transport_header(skb) -
skb_transport_header(skb);
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
thlen += inner_tcp_hdrlen(skb);
} else if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) {
thlen = tcp_hdrlen(skb);
} else if (unlikely(skb_is_gso_sctp(skb))) {
thlen = sizeof(struct sctphdr);
} else if (shinfo->gso_type & SKB_GSO_UDP_L4) {
thlen = sizeof(struct udphdr);
}
/* UFO sets gso_size to the size of the fragmentation
* payload, i.e. the size of the L4 (UDP) header is already
* accounted for.
*/
return thlen + shinfo->gso_size;
}
/**
* skb_gso_network_seglen - Return length of individual segments of a gso packet
*
* @skb: GSO skb
*
* skb_gso_network_seglen is used to determine the real size of the
* individual segments, including Layer3 (IP, IPv6) and L4 headers (TCP/UDP).
*
* The MAC/L2 header is not accounted for.
*/
static unsigned int skb_gso_network_seglen(const struct sk_buff *skb)
{
unsigned int hdr_len = skb_transport_header(skb) -
skb_network_header(skb);
return hdr_len + skb_gso_transport_seglen(skb);
}
/**
* skb_gso_mac_seglen - Return length of individual segments of a gso packet
*
* @skb: GSO skb
*
* skb_gso_mac_seglen is used to determine the real size of the
* individual segments, including MAC/L2, Layer3 (IP, IPv6) and L4
* headers (TCP/UDP).
*/
static unsigned int skb_gso_mac_seglen(const struct sk_buff *skb)
{
unsigned int hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
return hdr_len + skb_gso_transport_seglen(skb);
}
/**
* skb_gso_size_check - check the skb size, considering GSO_BY_FRAGS
*
* There are a couple of instances where we have a GSO skb, and we
* want to determine what size it would be after it is segmented.
*
* We might want to check:
* - L3+L4+payload size (e.g. IP forwarding)
* - L2+L3+L4+payload size (e.g. sanity check before passing to driver)
*
* This is a helper to do that correctly considering GSO_BY_FRAGS.
*
* @skb: GSO skb
*
* @seg_len: The segmented length (from skb_gso_*_seglen). In the
* GSO_BY_FRAGS case this will be [header sizes + GSO_BY_FRAGS].
*
* @max_len: The maximum permissible length.
*
* Returns true if the segmented length <= max length.
*/
static inline bool skb_gso_size_check(const struct sk_buff *skb,
unsigned int seg_len,
unsigned int max_len) {
const struct skb_shared_info *shinfo = skb_shinfo(skb);
const struct sk_buff *iter;
if (shinfo->gso_size != GSO_BY_FRAGS)
return seg_len <= max_len;
/* Undo this so we can re-use header sizes */
seg_len -= GSO_BY_FRAGS;
skb_walk_frags(skb, iter) {
if (seg_len + skb_headlen(iter) > max_len)
return false;
}
return true;
}
/**
* skb_gso_validate_network_len - Will a split GSO skb fit into a given MTU?
*
* @skb: GSO skb
* @mtu: MTU to validate against
*
* skb_gso_validate_network_len validates if a given skb will fit a
* wanted MTU once split. It considers L3 headers, L4 headers, and the
* payload.
*/
bool skb_gso_validate_network_len(const struct sk_buff *skb, unsigned int mtu)
{
return skb_gso_size_check(skb, skb_gso_network_seglen(skb), mtu);
}
EXPORT_SYMBOL_GPL(skb_gso_validate_network_len);
/**
* skb_gso_validate_mac_len - Will a split GSO skb fit in a given length?
*
* @skb: GSO skb
* @len: length to validate against
*
* skb_gso_validate_mac_len validates if a given skb will fit a wanted
* length once split, including L2, L3 and L4 headers and the payload.
*/
bool skb_gso_validate_mac_len(const struct sk_buff *skb, unsigned int len)
{
return skb_gso_size_check(skb, skb_gso_mac_seglen(skb), len);
}
EXPORT_SYMBOL_GPL(skb_gso_validate_mac_len);
static struct sk_buff *skb_reorder_vlan_header(struct sk_buff *skb)
{
int mac_len, meta_len;

1
net/ipv4/af_inet.c
View File

@ -100,6 +100,7 @@
#include <net/ip_fib.h>
#include <net/inet_connection_sock.h>
#include <net/gro.h>
#include <net/gso.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <net/udplite.h>

1
net/ipv4/esp4_offload.c
View File

@ -17,6 +17,7 @@
#include <linux/err.h>
#include <linux/module.h>
#include <net/gro.h>
#include <net/gso.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/esp.h>

1
net/ipv4/gre_offload.c
View File

@ -11,6 +11,7 @@
#include <net/protocol.h>
#include <net/gre.h>
#include <net/gro.h>
#include <net/gso.h>
static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
netdev_features_t features)

1
net/ipv4/ip_output.c
View File

@ -73,6 +73,7 @@
#include <net/arp.h>
#include <net/icmp.h>
#include <net/checksum.h>
#include <net/gso.h>
#include <net/inetpeer.h>
#include <net/inet_ecn.h>
#include <net/lwtunnel.h>

1
net/ipv4/tcp_offload.c
View File

@ -9,6 +9,7 @@
#include <linux/indirect_call_wrapper.h>
#include <linux/skbuff.h>
#include <net/gro.h>
#include <net/gso.h>
#include <net/tcp.h>
#include <net/protocol.h>

1
net/ipv4/udp.c
View File

@ -103,6 +103,7 @@
#include <net/ip_tunnels.h>
#include <net/route.h>
#include <net/checksum.h>
#include <net/gso.h>
#include <net/xfrm.h>
#include <trace/events/udp.h>
#include <linux/static_key.h>

1
net/ipv4/udp_offload.c
View File

@ -8,6 +8,7 @@
#include <linux/skbuff.h>
#include <net/gro.h>
#include <net/gso.h>
#include <net/udp.h>
#include <net/protocol.h>
#include <net/inet_common.h>

1
net/ipv6/esp6_offload.c
View File

@ -17,6 +17,7 @@
#include <linux/err.h>
#include <linux/module.h>
#include <net/gro.h>
#include <net/gso.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/esp.h>

1
net/ipv6/ip6_offload.c
View File

@ -16,6 +16,7 @@
#include <net/tcp.h>
#include <net/udp.h>
#include <net/gro.h>
#include <net/gso.h>
#include "ip6_offload.h"

1
net/ipv6/ip6_output.c
View File

@ -42,6 +42,7 @@
#include <net/sock.h>
#include <net/snmp.h>
#include <net/gso.h>
#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/protocol.h>

1
net/ipv6/udp_offload.c
View File

@ -14,6 +14,7 @@
#include <net/ip6_checksum.h>
#include "ip6_offload.h"
#include <net/gro.h>
#include <net/gso.h>
static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
netdev_features_t features)

1
net/mac80211/tx.c
View File

@ -26,6 +26,7 @@
#include <net/codel_impl.h>
#include <asm/unaligned.h>
#include <net/fq_impl.h>
#include <net/gso.h>
#include "ieee80211_i.h"
#include "driver-ops.h"

1
net/mpls/af_mpls.c
View File

@ -12,6 +12,7 @@
#include <linux/nospec.h>
#include <linux/vmalloc.h>
#include <linux/percpu.h>
#include <net/gso.h>
#include <net/ip.h>
#include <net/dst.h>
#include <net/sock.h>

1
net/mpls/mpls_gso.c
View File

@ -14,6 +14,7 @@
#include <linux/netdev_features.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/gso.h>
#include <net/mpls.h>
static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,

1
net/netfilter/nf_flow_table_ip.c
View File

@ -8,6 +8,7 @@
#include <linux/ipv6.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <net/gso.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>

1
net/netfilter/nfnetlink_queue.c
View File

@ -30,6 +30,7 @@
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/list.h>
#include <linux/cgroup-defs.h>
#include <net/gso.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/netfilter/nf_queue.h>

1
net/nsh/nsh.c
View File

@ -8,6 +8,7 @@
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/gso.h>
#include <net/nsh.h>
#include <net/tun_proto.h>

1
net/openvswitch/actions.c
View File

@ -17,6 +17,7 @@
#include <linux/if_vlan.h>
#include <net/dst.h>
#include <net/gso.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ip6_fib.h>

1
net/openvswitch/datapath.c
View File

@ -35,6 +35,7 @@
#include <linux/rculist.h>
#include <linux/dmi.h>
#include <net/genetlink.h>
#include <net/gso.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/pkt_cls.h>

1
net/sched/act_police.c
View File

@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <net/act_api.h>
#include <net/gso.h>
#include <net/netlink.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_police.h>

1
net/sched/sch_cake.c
View File

@ -65,6 +65,7 @@
#include <linux/reciprocal_div.h>
#include <net/netlink.h>
#include <linux/if_vlan.h>
#include <net/gso.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
#include <net/tcp.h>

1
net/sched/sch_netem.c
View File

@ -21,6 +21,7 @@
#include <linux/reciprocal_div.h>
#include <linux/rbtree.h>
#include <net/gso.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/inet_ecn.h>

1
net/sched/sch_taprio.c
View File

@ -20,6 +20,7 @@
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/time.h>
#include <net/gso.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>

1
net/sched/sch_tbf.c
View File

@ -13,6 +13,7 @@
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <net/gso.h>
#include <net/netlink.h>
#include <net/sch_generic.h>
#include <net/pkt_cls.h>

1
net/sctp/offload.c
View File

@ -22,6 +22,7 @@
#include <net/sctp/sctp.h>
#include <net/sctp/checksum.h>
#include <net/protocol.h>
#include <net/gso.h>
static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
{

1
net/xfrm/xfrm_device.c
View File

@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/gso.h>
#include <net/xfrm.h>
#include <linux/notifier.h>

1
net/xfrm/xfrm_interface_core.c
View File

@ -33,6 +33,7 @@
#include <linux/uaccess.h>
#include <linux/atomic.h>
#include <net/gso.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/ipv6.h>

1
net/xfrm/xfrm_output.c
View File

@ -13,6 +13,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/gso.h>
#include <net/icmp.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>