+static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
+ const struct bpf_insn *si,
+ struct bpf_insn *insn_buf,
+ struct bpf_prog *prog)
+{
+ struct bpf_insn *insn = insn_buf;
+ int off;
+
+ switch (si->off) {
+ case offsetof(struct bpf_sock_ops, op) ...
+ offsetof(struct bpf_sock_ops, replylong[3]):
+ BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) !=
+ FIELD_SIZEOF(struct bpf_sock_ops_kern, op));
+ BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) !=
+ FIELD_SIZEOF(struct bpf_sock_ops_kern, reply));
+ BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) !=
+ FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong));
+ off = si->off;
+ off -= offsetof(struct bpf_sock_ops, op);
+ off += offsetof(struct bpf_sock_ops_kern, op);
+ if (type == BPF_WRITE)
+ *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
+ off);
+ else
+ *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
+ off);
+ break;
+
+ case offsetof(struct bpf_sock_ops, family):
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
+
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
+ offsetof(struct sock_common, skc_family));
+ break;
+
+ case offsetof(struct bpf_sock_ops, remote_ip4):
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
+
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
+ offsetof(struct sock_common, skc_daddr));
+ break;
+
+ case offsetof(struct bpf_sock_ops, local_ip4):
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_rcv_saddr) != 4);
+
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
+ offsetof(struct sock_common,
+ skc_rcv_saddr));
+ break;
+
+ case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
+ offsetof(struct bpf_sock_ops, remote_ip6[3]):
+#if IS_ENABLED(CONFIG_IPV6)
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
+ skc_v6_daddr.s6_addr32[0]) != 4);
+
+ off = si->off;
+ off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
+ offsetof(struct sock_common,
+ skc_v6_daddr.s6_addr32[0]) +
+ off);
+#else
+ *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
+#endif
+ break;
+
+ case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
+ offsetof(struct bpf_sock_ops, local_ip6[3]):
+#if IS_ENABLED(CONFIG_IPV6)
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
+ skc_v6_rcv_saddr.s6_addr32[0]) != 4);
+
+ off = si->off;
+ off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
+ offsetof(struct sock_common,
+ skc_v6_rcv_saddr.s6_addr32[0]) +
+ off);
+#else
+ *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
+#endif
+ break;
+
+ case offsetof(struct bpf_sock_ops, remote_port):
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
+
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
+ offsetof(struct sock_common, skc_dport));
+#ifndef __BIG_ENDIAN_BITFIELD
+ *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
+#endif
+ break;
+
+ case offsetof(struct bpf_sock_ops, local_port):
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
+
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
+ offsetof(struct sock_common, skc_num));
+ break;
+ }
+ return insn - insn_buf;
+}
+