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Message-Id: <1400092969-34481-2-git-send-email-chema@google.com>
Date: Wed, 14 May 2014 11:42:48 -0700
From: Chema Gonzalez <chema@...gle.com>
To: David Miller <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Alexei Starovoitov <ast@...mgrid.com>, dborkman@...hat.com
Cc: netdev@...r.kernel.org, Chema Gonzalez <chema@...gle.com>
Subject: [PATCH v2 net-next 2/3] net: filter: add insn for loading internal transport header offset
Patch adds an ANC_TRA_OFFSET insn that loads the internal transport
header of a packet ("internal" meaning after decapsulation by the
flow dissector).
Signed-off-by: Chema Gonzalez <chema@...gle.com>
---
include/linux/filter.h | 1 +
include/uapi/linux/filter.h | 3 ++-
net/core/filter.c | 17 +++++++++++++++++
tools/net/bpf_exp.l | 1 +
tools/net/bpf_exp.y | 11 ++++++++++-
5 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4457b38..72b3e63 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -306,6 +306,7 @@ enum {
BPF_S_ANC_VLAN_TAG_PRESENT,
BPF_S_ANC_PAY_OFFSET,
BPF_S_ANC_RANDOM,
+ BPF_S_ANC_TRA_OFFSET,
};
#endif /* __LINUX_FILTER_H__ */
diff --git a/include/uapi/linux/filter.h b/include/uapi/linux/filter.h
index 253b4d4..9f1b8f1 100644
--- a/include/uapi/linux/filter.h
+++ b/include/uapi/linux/filter.h
@@ -131,7 +131,8 @@ struct sock_fprog { /* Required for SO_ATTACH_FILTER. */
#define SKF_AD_VLAN_TAG_PRESENT 48
#define SKF_AD_PAY_OFFSET 52
#define SKF_AD_RANDOM 56
-#define SKF_AD_MAX 60
+#define SKF_AD_TRA_OFFSET 60
+#define SKF_AD_MAX 64
#define SKF_NET_OFF (-0x100000)
#define SKF_LL_OFF (-0x200000)
diff --git a/net/core/filter.c b/net/core/filter.c
index b71948b..c4ba8f9 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -615,6 +615,17 @@ static u64 __skb_get_pay_offset(u64 ctx, u64 a, u64 x, u64 r4, u64 r5)
return __skb_get_poff(context->skb, context->flow);
}
+static u64 __skb_get_tra_offset(u64 ctx, u64 a, u64 x, u64 r4, u64 r5)
+{
+ struct sk_run_filter_ctx *context = (struct sk_run_filter_ctx *)
+ (unsigned long) ctx;
+ /* check whether the flow dissector has already been run */
+ if (!__flow_keys_inited(context->flow))
+ if (!skb_flow_dissect(context->skb, context->flow))
+ return 0;
+ return context->flow->thoff;
+}
+
static u64 __skb_get_nlattr(u64 ctx, u64 a, u64 x, u64 r4, u64 r5)
{
struct sk_buff *skb = (struct sk_buff *)(unsigned long) ctx;
@@ -781,6 +792,7 @@ static bool convert_bpf_extensions(struct sock_filter *fp,
case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
case SKF_AD_OFF + SKF_AD_CPU:
case SKF_AD_OFF + SKF_AD_RANDOM:
+ case SKF_AD_OFF + SKF_AD_TRA_OFFSET:
/* arg1 = ctx */
*insn = BPF_ALU64_REG(BPF_MOV, BPF_REG_ARG1, BPF_REG_CTX);
insn++;
@@ -811,6 +823,9 @@ static bool convert_bpf_extensions(struct sock_filter *fp,
case SKF_AD_OFF + SKF_AD_RANDOM:
insn->imm = __get_random_u32 - __bpf_call_base;
break;
+ case SKF_AD_OFF + SKF_AD_TRA_OFFSET:
+ insn->imm = __skb_get_tra_offset - __bpf_call_base;
+ break;
}
break;
@@ -1348,6 +1363,7 @@ int sk_chk_filter(struct sock_filter *filter, unsigned int flen)
ANCILLARY(VLAN_TAG_PRESENT);
ANCILLARY(PAY_OFFSET);
ANCILLARY(RANDOM);
+ ANCILLARY(TRA_OFFSET);
}
/* ancillary operation unknown or unsupported */
@@ -1733,6 +1749,7 @@ void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to)
[BPF_S_ANC_VLAN_TAG_PRESENT] = BPF_LD|BPF_B|BPF_ABS,
[BPF_S_ANC_PAY_OFFSET] = BPF_LD|BPF_B|BPF_ABS,
[BPF_S_ANC_RANDOM] = BPF_LD|BPF_B|BPF_ABS,
+ [BPF_S_ANC_TRA_OFFSET] = BPF_LD|BPF_B|BPF_ABS,
[BPF_S_LD_W_LEN] = BPF_LD|BPF_W|BPF_LEN,
[BPF_S_LD_W_IND] = BPF_LD|BPF_W|BPF_IND,
[BPF_S_LD_H_IND] = BPF_LD|BPF_H|BPF_IND,
diff --git a/tools/net/bpf_exp.l b/tools/net/bpf_exp.l
index 833a966..4e72934 100644
--- a/tools/net/bpf_exp.l
+++ b/tools/net/bpf_exp.l
@@ -93,6 +93,7 @@ extern void yyerror(const char *str);
"#"?("vlan_tci") { return K_VLANT; }
"#"?("vlan_pr") { return K_VLANP; }
"#"?("rand") { return K_RAND; }
+"#"?("toff") { return K_TOFF; }
":" { return ':'; }
"," { return ','; }
diff --git a/tools/net/bpf_exp.y b/tools/net/bpf_exp.y
index e6306c5..ced6949 100644
--- a/tools/net/bpf_exp.y
+++ b/tools/net/bpf_exp.y
@@ -56,7 +56,7 @@ static void bpf_set_jmp_label(char *label, enum jmp_type type);
%token OP_LDXI
%token K_PKT_LEN K_PROTO K_TYPE K_NLATTR K_NLATTR_NEST K_MARK K_QUEUE K_HATYPE
-%token K_RXHASH K_CPU K_IFIDX K_VLANT K_VLANP K_POFF K_RAND
+%token K_RXHASH K_CPU K_IFIDX K_VLANT K_VLANP K_POFF K_RAND K_TOFF
%token ':' ',' '[' ']' '(' ')' 'x' 'a' '+' 'M' '*' '&' '#' '%'
@@ -167,6 +167,9 @@ ldb
| OP_LDB K_RAND {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_RANDOM); }
+ | OP_LDB K_TOFF {
+ bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
+ SKF_AD_OFF + SKF_AD_TRA_OFFSET); }
;
ldh
@@ -218,6 +221,9 @@ ldh
| OP_LDH K_RAND {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_RANDOM); }
+ | OP_LDH K_TOFF {
+ bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
+ SKF_AD_OFF + SKF_AD_TRA_OFFSET); }
;
ldi
@@ -274,6 +280,9 @@ ld
| OP_LD K_RAND {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_RANDOM); }
+ | OP_LD K_TOFF {
+ bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
+ SKF_AD_OFF + SKF_AD_TRA_OFFSET); }
| OP_LD 'M' '[' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_MEM, 0, 0, $4); }
| OP_LD '[' 'x' '+' number ']' {
--
1.9.1.423.g4596e3a
--
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