recvfrom() socket is not working after this function - sockets

Question

I am facing issue with calling to recvfrom function:
recvfrom(sock, dat, sizeof(dat), 0, (void *)&peername, &peernamelen);
Until this all functions are working.
Please let me know where I am making mistake. Should I use bind or not, or any mistake from this.
Output:
before sockname
after sockname
after sock
after setsockopt
after Bind
before recvfrom
My code:
struct sockaddr_can sockname = {
.can_family = AF_CAN,
.can_addr.j1939 = {
.addr = J1939_NO_ADDR,
.name = J1939_NO_NAME,
.pgn = J1939_NO_PGN,
},
}, peername = {
.can_family = AF_CAN,
.can_addr.j1939 = {
.addr = J1939_NO_ADDR,
.name = J1939_NO_NAME,
.pgn = J1939_NO_PGN,
},
};
uint8_t dat[128];
int valid_peername = 0;
unsigned int todo_send = 0;
int todo_recv = 0, todo_echo = 0, todo_prio = -1;
int todo_connect = 0, todo_names = 0, todo_wait = 0, todo_rebind = 0;
int todo_broadcast = 0, todo_promisc = 0;
int no_bind = 0,i;
printf("before sockname\n");
sockname.can_ifindex = if_nametoindex(CAN_SOCKET_NAME);
printf("after sockname\n");
sock = socket(PF_CAN, SOCK_DGRAM, CAN_J1939);
printf("after sock\n");
setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &todo_broadcast, sizeof(todo_broadcast));
printf("after setsockopt\n");
ret = bind(sock, (void *)&sockname, sizeof(sockname));
if (ret < 0)
err(1, "bind()");
printf("after Bind\n");
while(1){
peernamelen = sizeof(peername);
printf("before recvfrom\n");
recvfrom(sock, dat, sizeof(dat), 0, (void *)&peername, &peernamelen);
printf("%02x %05x:", peername.can_addr.j1939.addr, peername.can_addr.j1939.pgn);
for (i = 0, j = 0; i < ret; ++i, j++) {
if (j == 8) {
printf("\n%05x ", i);
j = 0;
}
printf(" %02x", dat[i]);
}
printf("\n");
}
Please help me to solve this issue.