netdev - [PATCH net-next] PPC: bpf_jit_comp: add SKF_AD

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu,  6 Nov 2014 09:02:35 +0300
From:	Denis Kirjanov <kda@...ux-powerpc.org>
To:	netdev@...r.kernel.org
Cc:	linuxppc-dev@...abs.org, Denis Kirjanov <kda@...ux-powerpc.org>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Philippe Bergheaud <felix@...ux.vnet.ibm.com>
Subject: [PATCH net-next] PPC: bpf_jit_comp: add SKF_AD_HATYPE instruction

Add BPF extension SKF_AD_HATYPE to ppc JIT to check
the hw type of the interface

JIT off:
[   69.106783] test_bpf: #20 LD_HATYPE 48 48 PASS
JIT on:
[   64.721757] test_bpf: #20 LD_HATYPE 7 6 PASS

CC: Alexei Starovoitov<alexei.starovoitov@...il.com>
CC: Daniel Borkmann<dborkman@...hat.com>
CC: Philippe Bergheaud<felix@...ux.vnet.ibm.com>
Signed-off-by: Denis Kirjanov <kda@...ux-powerpc.org>
---
 arch/powerpc/net/bpf_jit_comp.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index d110e28..8bf4fc2 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -412,6 +412,22 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image,
 			PPC_ANDI(r_A, r_A, PKT_TYPE_MAX);
 			PPC_SRWI(r_A, r_A, 5);
 			break;
+		case BPF_ANC | SKF_AD_HATYPE:
+			BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2);
+			PPC_LD_OFFS(r_scratch1, r_skb, offsetof(struct sk_buff,
+								dev));
+			PPC_CMPDI(r_scratch1, 0);
+			if (ctx->pc_ret0 != -1) {
+				PPC_BCC(COND_EQ, addrs[ctx->pc_ret0]);
+			} else {
+				/* Exit, returning 0; first pass hits here. */
+				PPC_BCC_SHORT(COND_NE, (ctx->idx*4)+12);
+				PPC_LI(r_ret, 0);
+				PPC_JMP(exit_addr);
+			}
+			PPC_LHZ_OFFS(r_A, r_scratch1,
+				     offsetof(struct net_device, type));
+			break;
 		case BPF_ANC | SKF_AD_CPU:
 #ifdef CONFIG_SMP
 			/*
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html