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net: remove VLAN_TAG_PRESENT 

Replace VLAN_TAG_PRESENT with single bit flag and free up
VLAN.CFI overload. Now VLAN.CFI is visible in networking stack
and can be passed around intact.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michał Mirosław 2018-11-10 19:58:36 +01:00 committed by David S. Miller
parent 4b50d23179
commit 0c4b2d3705
7 changed files with 23 additions and 34 deletions
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3
arch/mips/net/bpf_jit.c
View File

@ -1164,9 +1164,6 @@ static int build_body(struct jit_ctx *ctx)
vlan_tci) != 2);
off = offsetof(struct sk_buff, vlan_tci);
emit_half_load_unsigned(r_A, r_skb, off, ctx);
#ifdef VLAN_TAG_PRESENT
emit_andi(r_A, r_A, (u16)~VLAN_TAG_PRESENT, ctx);
#endif
break;
case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT:
ctx->flags |= SEEN_SKB | SEEN_A;

3
arch/powerpc/net/bpf_jit_comp.c
View File

@ -383,9 +383,6 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image,
PPC_LHZ_OFFS(r_A, r_skb, offsetof(struct sk_buff,
vlan_tci));
#ifdef VLAN_TAG_PRESENT
PPC_ANDI(r_A, r_A, ~VLAN_TAG_PRESENT);
#endif
break;
case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT:
PPC_LBZ_OFFS(r_A, r_skb, PKT_VLAN_PRESENT_OFFSET());

4
arch/sparc/net/bpf_jit_comp_32.c
View File

@ -553,10 +553,6 @@ void bpf_jit_compile(struct bpf_prog *fp)
break;
case BPF_ANC | SKF_AD_VLAN_TAG:
emit_skb_load16(vlan_tci, r_A);
#ifdef VLAN_TAG_PRESENT
emit_loadimm(~VLAN_TAG_PRESENT, r_TMP);
emit_and(r_A, r_TMP, r_A);
#endif
break;
case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT:
__emit_skb_load8(__pkt_vlan_present_offset, r_A);

11
include/linux/if_vlan.h
View File

@ -66,7 +66,6 @@ static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
#define VLAN_PRIO_SHIFT 13
#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
#define VLAN_TAG_PRESENT VLAN_CFI_MASK
#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
#define VLAN_N_VID 4096
@ -78,8 +77,8 @@ static inline bool is_vlan_dev(const struct net_device *dev)
return dev->priv_flags & IFF_802_1Q_VLAN;
}
#define skb_vlan_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
#define skb_vlan_tag_present(__skb) ((__skb)->vlan_present)
#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci)
#define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
#define skb_vlan_tag_get_prio(__skb) (((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT)
@ -480,7 +479,7 @@ static inline struct sk_buff *vlan_insert_tag_set_proto(struct sk_buff *skb,
*/
static inline void __vlan_hwaccel_clear_tag(struct sk_buff *skb)
{
skb->vlan_tci = 0;
skb->vlan_present = 0;
}
/**
@ -492,6 +491,7 @@ static inline void __vlan_hwaccel_clear_tag(struct sk_buff *skb)
*/
static inline void __vlan_hwaccel_copy_tag(struct sk_buff *dst, const struct sk_buff *src)
{
dst->vlan_present = src->vlan_present;
dst->vlan_proto = src->vlan_proto;
dst->vlan_tci = src->vlan_tci;
}
@ -526,7 +526,8 @@ static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb,
__be16 vlan_proto, u16 vlan_tci)
{
skb->vlan_proto = vlan_proto;
skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
skb->vlan_tci = vlan_tci;
skb->vlan_present = 1;
}
/**

16
include/linux/skbuff.h
View File

@ -777,6 +777,14 @@ struct sk_buff {
__u8 encap_hdr_csum:1;
__u8 csum_valid:1;
#ifdef __BIG_ENDIAN_BITFIELD
#define PKT_VLAN_PRESENT_BIT 7
#else
#define PKT_VLAN_PRESENT_BIT 0
#endif
#define PKT_VLAN_PRESENT_OFFSET() offsetof(struct sk_buff, __pkt_vlan_present_offset)
__u8 __pkt_vlan_present_offset[0];
__u8 vlan_present:1;
__u8 csum_complete_sw:1;
__u8 csum_level:2;
__u8 csum_not_inet:1;
@ -784,8 +792,8 @@ struct sk_buff {
#ifdef CONFIG_IPV6_NDISC_NODETYPE
__u8 ndisc_nodetype:2;
#endif
__u8 ipvs_property:1;
__u8 ipvs_property:1;
__u8 inner_protocol_type:1;
__u8 remcsum_offload:1;
#ifdef CONFIG_NET_SWITCHDEV
@ -816,12 +824,6 @@ struct sk_buff {
__u32 priority;
int skb_iif;
__u32 hash;
#define PKT_VLAN_PRESENT_BIT 4 // CFI (12-th bit) in TCI
#ifdef __BIG_ENDIAN
#define PKT_VLAN_PRESENT_OFFSET() offsetof(struct sk_buff, vlan_tci)
#else
#define PKT_VLAN_PRESENT_OFFSET() (offsetof(struct sk_buff, vlan_tci) + 1)
#endif
__be16 vlan_proto;
__u16 vlan_tci;
#if defined(CONFIG_NET_RX_BUSY_POLL) || defined(CONFIG_XPS)

14
lib/test_bpf.c
View File

@ -39,6 +39,7 @@
#define SKB_HASH 0x1234aaab
#define SKB_QUEUE_MAP 123
#define SKB_VLAN_TCI 0xffff
#define SKB_VLAN_PRESENT 1
#define SKB_DEV_IFINDEX 577
#define SKB_DEV_TYPE 588
@ -725,8 +726,8 @@ static struct bpf_test tests[] = {
CLASSIC,
{ },
{
{ 1, SKB_VLAN_TCI & ~VLAN_TAG_PRESENT },
{ 10, SKB_VLAN_TCI & ~VLAN_TAG_PRESENT }
{ 1, SKB_VLAN_TCI },
{ 10, SKB_VLAN_TCI }
},
},
{
@ -739,8 +740,8 @@ static struct bpf_test tests[] = {
CLASSIC,
{ },
{
{ 1, !!(SKB_VLAN_TCI & VLAN_TAG_PRESENT) },
{ 10, !!(SKB_VLAN_TCI & VLAN_TAG_PRESENT) }
{ 1, SKB_VLAN_PRESENT },
{ 10, SKB_VLAN_PRESENT }
},
},
{
@ -5289,8 +5290,8 @@ static struct bpf_test tests[] = {
#endif
{ },
{
{ 1, !!(SKB_VLAN_TCI & VLAN_TAG_PRESENT) },
{ 10, !!(SKB_VLAN_TCI & VLAN_TAG_PRESENT) }
{ 1, SKB_VLAN_PRESENT },
{ 10, SKB_VLAN_PRESENT }
},
.fill_helper = bpf_fill_maxinsns6,
.expected_errcode = -ENOTSUPP,
@ -6493,6 +6494,7 @@ static struct sk_buff *populate_skb(char *buf, int size)
skb->hash = SKB_HASH;
skb->queue_mapping = SKB_QUEUE_MAP;
skb->vlan_tci = SKB_VLAN_TCI;
skb->vlan_present = SKB_VLAN_PRESENT;
skb->vlan_proto = htons(ETH_P_IP);
dev_net_set(&dev, &init_net);
skb->dev = &dev;

6
net/core/filter.c
View File

@ -301,9 +301,6 @@ static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
/* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
*insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
offsetof(struct sk_buff, vlan_tci));
#ifdef VLAN_TAG_PRESENT
*insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, ~VLAN_TAG_PRESENT);
#endif
break;
case SKF_AD_VLAN_TAG_PRESENT:
*insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET());
@ -6152,9 +6149,6 @@ static u32 bpf_convert_ctx_access(enum bpf_access_type type,
*insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
bpf_target_off(struct sk_buff, vlan_tci, 2,
target_size));
#ifdef VLAN_TAG_PRESENT
*insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, ~VLAN_TAG_PRESENT);
#endif
break;
case offsetof(struct __sk_buff, cb[0]) ...