## Five Possible Code Completions for smc_ib_find_route:

**1. Simple route lookup and neighbor discovery:**

```c
	rt = ip_route_output_key(net, &fl4);
	if (IS_ERR(rt)) {
		*uses_gateway = 0;
		return PTR_ERR(rt);
	}
	neigh = neigh_lookup(net, rt->rt_gateway, rt->rt_gateway_len,
			      rt->rt_family, 0);
	if (neigh) {
		*uses_gateway = 1;
		memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
	}
	rt_free(rt);
	return neigh ? 0 : -ENOENT;
```

**2. Handling specific route types:**

```c
	rt = ip_route_output_key_rtattr(net, &fl4, RTA_DST, &daddr,
					 RTA_GATEWAY, &rt->rt_gateway,
					 RTA_GATEWAY_LEN);
	if (IS_ERR(rt)) {
		*uses_gateway = 0;
		return PTR_ERR(rt);
	}
	if (rt->rt_type == RTN_UNREACHABLE) {
		*uses_gateway = 0;
		rt_free(rt);
		return -ENETUNREACH;
	}
	// ... (Rest of the code similar to option 1)
```

**3. Checking for local destination:**

```c
	if (ipv4_is_local(net, daddr)) {
		*uses_gateway = 0;
		// ... (Use local interface information to find MAC address)
		return 0;
	}
	// ... (Rest of the code similar to option 1)
```

**4. Using a custom routing table:**

```c
	// ... (Get a custom routing table based on context)
	rt = ip_route_output_rt(net, &fl4, custom_table);
	if (IS_ERR(rt)) {
		*uses_gateway = 0;
		return PTR_ERR(rt);
	}
	// ... (Rest of the code similar to option 1)
```

**5. Adding custom routing logic:**

```c
	// ... (Implement custom logic to select the route)
	rt = /* ... (Get the selected route) ... */ ;
	if (!rt) {
		*uses_gateway = 0;
		return -ENOENT;
	}
	// ... (Rest of the code similar to option 1)
```

These are just five examples of possible code completions. The specific implementation will depend on the context and requirements of your code. Remember to choose the option that best fits your needs and ensures proper error handling. 
