kern: rodata map not supported on kernel 4.19 or older

fixes : #222 .rodata: map create: read- and write-only maps not supported Signed-off-by: CFC4N <cfc4n.cs@gmail.com>
gojue · Sep 29, 2022 · dc3bbe1 · dc3bbe1
1 parent 7b1e8e5
commit dc3bbe1
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Showing 2 changed files with 5 additions and 4 deletions.
diff --git a/kern/common.h b/kern/common.h
@@ -31,12 +31,12 @@
 #define ETH_P_IP 0x0800 /* Internet Protocol packet        */
 #define SKB_MAX_DATA_SIZE 2048
 
-// alawyse, we used it in openssl_tc.h
-const volatile u32 target_port = 443;
 
-// Optional Target PID
 // .rodata section bug via : https://github.com/ehids/ecapture/issues/39
 #ifndef KERNEL_LESS_5_2
+// alawyse, we used it in openssl_tc.h
+const volatile u32 target_port = 443;
+// Optional Target PID
 const volatile u64 target_pid = 0;
 const volatile u64 target_uid = 0;
 const volatile int target_errno = BASH_ERRNO_DEFAULT;

diff --git a/kern/openssl_tc.h b/kern/openssl_tc.h
@@ -110,11 +110,12 @@ int capture_packets(struct __sk_buff *skb, bool is_ingress) {
     }
     struct tcphdr *tcp = (struct tcphdr *)(data_start + l4_hdr_off);
 
+#ifndef KERNEL_LESS_5_2
     if (tcp->source != bpf_htons(target_port) &&
         tcp->dest != bpf_htons(target_port)) {
         return TC_ACT_OK;
     }
-
+#endif
     //    debug_bpf_printk("capture_packets port : %d, dest port :%d\n",
     //    bpf_ntohs(tcp->source), bpf_ntohs(tcp->dest));
     // get the skb data event