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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/net/ipv4/ip_sockglue.c
..
..
@@ -317,7 +317,14 @@
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 			ipc->tos = val;
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 			ipc->priority = rt_tos2priority(ipc->tos);
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 			break;
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-
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+		case IP_PROTOCOL:
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+			if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
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+				return -EINVAL;
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+			val = *(int *)CMSG_DATA(cmsg);
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+			if (val < 1 || val > 255)
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+				return -EINVAL;
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+			ipc->protocol = val;
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+			break;
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 		default:
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 			return -EINVAL;
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 		}
..
..
@@ -1724,6 +1731,9 @@
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 	case IP_MINTTL:
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 		val = inet->min_ttl;
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 		break;
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+	case IP_PROTOCOL:
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+		val = inet_sk(sk)->inet_num;
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+		break;
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 	default:
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 		release_sock(sk);
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 		return -ENOPROTOOPT;