1.
flow.c 加上 OVS_LOG_INFO() compile時會有問題，已加上#include "Debug.h"，一樣有其他問題
lib/flow.c:28:56: fatal error: Debug.h: No such file or directorycompilation terminated.Makefile:4700: recipe for target 'lib/flow.lo' failedmake[2]: *** [lib/flow.lo] Error 1make[2]: Leaving directory '/usr/local/ovs'Makefile:5426: recipe for target 'all-recursive' failedmake[1]: *** [all-recursive] Error 1make[1]: Leaving directory '/usr/local/ovs'Makefile:3171: recipe for target 'all' failedmake: *** [all] Error 22. flow.c 加上 fprintf(fp, "%s %d", "ip_src", &nh->ip_src);
數值會跳。因為 &nh->ip_src 拿到的東西是記憶體位置，不是 ip_src 的值。
lib/flow.c: In function ‘miniflow_extract’:lib/flow.c:779:20: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘const ovs_16aligned_be32 * {aka const struct <anonymous> *}’ [-Wformat=] fprintf(fp,"%s %d" ,"ip_src", &nh->ip_src); ^depbase=`echo lib/guarded-list.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\3. 在 flow.c 內，位置在 /usr/local/ovs/lib/flow.c 。
目前把 ip_src 跟 ip_dst 和 tot_len ，但 ip 顯示為十進制有機會成為負值，另 tot_len 僅為 L3 的長度，不包含L2。
%ld 就可以解決。 %d 不夠長的問題，會繞兩圈回來成為負值。
786 dp_packet_set_l2_pad_size(packet, size - tot_len);
787 size = tot_len; /* Never pull padding. */
788
789 //OVS_LOG_INFO("src_ip_20171111");
790 //OVS_LOG_INFO("dst_ip_20171111");
791 fp = fopen("flow_c.txt","a");
792 fprintf(fp,"ip_src = %d \n", nh->ip_src);
793 fprintf(fp,"ip_dst = %d \n", nh->ip_dst);
794 fprintf(fp,"tot_len= %d \n", tot_len);
795 fprintf(fp,"------------- \n");
796 fclose(fp);
797
798
799 /* Push both source and destination address at once. */
800 miniflow_push_words(mf, nw_src, &nh->ip_src, 1);
801 if (ct_nw_proto_p && !md->ct_orig_tuple_ipv6) {
lib/flow.c: In function ‘miniflow_extract’:lib/flow.c:779:20: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘ovs_16aligned_be32 {aka const struct <anonymous>}’ [-Wformat=] fprintf(fp,"ip_src = %d \n", nh->ip_src); ^lib/flow.c:780:20: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘ovs_16aligned_be32 {aka const struct <anonymous>}’ [-Wformat=] fprintf(fp,"ip_dst = %d \n", nh->ip_dst);4. print uint32_t 的問題
%ld 就可以解決
lib/flow.c: In function ‘miniflow_extract’:lib/flow.c:792:20: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘ovs_16aligned_be32 {aka const struct <anonymous>}’ [-Wformat=] fprintf(fp,"ip_src = %d \n", nh->ip_src); ^lib/flow.c:793:20: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘ovs_16aligned_be32 {aka const struct <anonymous>}’ [-Wformat=] fprintf(fp,"ip_dst = %d \n", nh->ip_dst); ^lib/flow.c:794:24: error: expected ‘)’ before ‘PRlu32’ fprintf(fp,"%" PRlu32 "\n", nh->ip_dst); ^lib/flow.c:794:20: warning: spurious trailing ‘%’ in format [-Wformat=] fprintf(fp,"%" PRlu32 "\n", nh->ip_dst); ^lib/flow.c:795:9: error: aggregate value used where an integer was expected fprintf(fp,"%u\n",(unsigned int)nh->ip_dst); ^Makefile:4700: recipe for target 'lib/flow.lo' failedmake[2]: *** [lib/flow.lo] Error 1make[2]: Leaving directory '/usr/local/ovs'Makefile:5426: recipe for target 'all-recursive' failedmake[1]: *** [all-recursive] Error 1make[1]: Leaving directory '/usr/local/ovs'Makefile:3171: recipe for target 'all' failedmake: *** [all] Error 2ll